WO2018169146A1 - Fluid coupling containing power-free mechanical speed control unit for pump - Google Patents
Fluid coupling containing power-free mechanical speed control unit for pump Download PDFInfo
- Publication number
- WO2018169146A1 WO2018169146A1 PCT/KR2017/008863 KR2017008863W WO2018169146A1 WO 2018169146 A1 WO2018169146 A1 WO 2018169146A1 KR 2017008863 W KR2017008863 W KR 2017008863W WO 2018169146 A1 WO2018169146 A1 WO 2018169146A1
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- WO
- WIPO (PCT)
- Prior art keywords
- fluid coupling
- pump
- fluid
- control unit
- housing
- Prior art date
Links
- 239000012530 fluid Substances 0.000 title claims abstract description 48
- 230000008878 coupling Effects 0.000 title claims abstract description 24
- 238000010168 coupling process Methods 0.000 title claims abstract description 24
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 24
- 238000001816 cooling Methods 0.000 claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 4
- 239000010720 hydraulic oil Substances 0.000 claims description 2
- 238000006073 displacement reaction Methods 0.000 claims 2
- 230000005284 excitation Effects 0.000 claims 1
- 239000007788 liquid Substances 0.000 claims 1
- 238000007599 discharging Methods 0.000 abstract 3
- 230000005540 biological transmission Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000017525 heat dissipation Effects 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000003134 recirculating effect Effects 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D13/00—Pumping installations or systems
- F04D13/02—Units comprising pumps and their driving means
- F04D13/04—Units comprising pumps and their driving means the pump being fluid driven
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
- F04D15/0077—Safety measures
- F04D15/0083—Protection against sudden pressure change, e.g. check valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/58—Cooling; Heating; Diminishing heat transfer
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/58—Cooling; Heating; Diminishing heat transfer
- F04D29/586—Cooling; Heating; Diminishing heat transfer specially adapted for liquid pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D33/00—Rotary fluid couplings or clutches of the hydrokinetic type
- F16D33/06—Rotary fluid couplings or clutches of the hydrokinetic type controlled by changing the amount of liquid in the working circuit
- F16D33/08—Rotary fluid couplings or clutches of the hydrokinetic type controlled by changing the amount of liquid in the working circuit by devices incorporated in the fluid coupling, with or without remote control
Definitions
- the present invention relates to a non-powered mechanical automatic control power transmission device composed of variable speed fluid coupling, control device and valves.
- Conventional fluid couplings include a connection between a primary drive wheel (compressor wheel) and a secondary driven wheel (turbine wheel).
- VVVF inverter
- the present invention ensures reliability through a mechanical control device without a separate power supply for the level of fluid coupling and working fluid secured durability.
- the heat dissipation load of the working fluid according to the small capacity circulates a part of the discharge fluid in the pump side and maximizes the surface area of the casing shape so as to dissipate heat in the atmosphere, so that there is no loss of equipment and power for cooling and circulation.
- the present invention ensures reliability through a mechanical control device without a separate power supply for the level of fluid coupling and working fluid secured durability.
- the heat dissipation load of the working fluid according to the small capacity circulates a part of the discharge fluid in the pump side and maximizes the surface area of the casing shape so as to dissipate heat in the atmosphere, so that there is no loss of equipment and power for cooling and circulation.
- VVVF variable speed load with inverter
- the power transmission device controls the level of hydraulic oil or water to determine the amount of slip between the pump side turbine wheel and the drive motor side wheel of the fluid coupling to the pressure of the pump output side to the load of the pump.
- FIG. 1 is an overall assembly view of a fluid coupling equipped with a control device.
- FIG. 2 is a conceptual diagram illustrating a structure of a control device of the present invention.
- 3 is a conceptual diagram of a guider for recirculating water.
- FIG. 1 is a representative view of the present invention outlined.
- the primary drive side compressor wheel 1 is connected to a drive source such as an engine, a motor, and the like, and power is input. Outside the input shaft, a bearing for supporting the shaft and a seal for maintaining the airtightness are connected.
- the secondary driven side turbine wheel (2) facing the primary drive side compressor wheel (1) generates a slip amount according to the level of the intermediate working fluid and receives power by the rotational speed of the primary drive side impeller (1).
- the level of the working fluid which determines the amount of slip generated is the working fluid supplied to the coupling through the control valve 6 by the pressure of the amount of working fluid supplied from the tank 5 is sensed at the output side of the pump. It is controlled based on the amount of.
- the housing 4 is a flange of the coupling input shaft is connected to the drive motor, the flange of the coupling output shaft 10 is connected with the pump, the fluid coupling assembly is built in, the discharge pressure of the pump side connected thereto
- the amount of operating fluid supplied is controlled by controlling the opening degree of the valve 6 through the amount of change in pressure.
- an adjustment knob 7 is provided on the valve stem which specifies the basic setting of the valve.
- the casing also includes a pipe that helps to cool the working fluid while circulating a part of the discharge fluid on the pump side, and a pipe having a finned surface that maximizes heat transfer efficiency.
- FIG. 3 shows the principle that the working fluid introduced to the casing bottom of the working fluid of the fluid coupling is finally returned to the tank while being returned by the rotation of the wheel.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The present invention relates to a fluid coupling containing a power-free mechanical speed control unit for a pump wherein, in order to compensate for a discharging water pressure change in accordance with a change of a discharging rate of the pump, the fluid coupling senses a discharging pressure change of the pump and controls a rotation number of the fluid coupling connected to the input shaft of the pump side through the same. The fluid coupling comprises a fluid coupling housing, a circulation fluid tank integrally embedded in the housing, and a mechanical control unit, wherein the fluid coupling housing has a wing shape on the outside thereof to maximize the quantity of heat discharge in the atmosphere through cooling of working fluid and partially circulates a fluid of the output side of the pump to satisfy the cooling performance thereof. Therefore, the fluid coupling has a semi-permanent durability without using a power for a separate control.
Description
본 발명은 가변속 유체 커플링, 제어장치 및 밸브들로 구성된 무동력 기계식 자동제어 동력 전달 장치에 관한 것이다.The present invention relates to a non-powered mechanical automatic control power transmission device composed of variable speed fluid coupling, control device and valves.
1. 기존의 유체커플링은 1차 구동휠(컴프레서 휠)과 2차 피동휠(터빈 휠) 사이의 1. Conventional fluid couplings include a connection between a primary drive wheel (compressor wheel) and a secondary driven wheel (turbine wheel).
유체를 매체로 동력이 전달되는 원리이며, 이때 매체인 유체의 양을 조절하여 It is a principle that power is transmitted to a medium, and in this case, the amount of fluid
1차 구동휠과 2차 피동휠 사이의 슬립량에 의한 전달 동력 또는 회전수의 변경 Change of transmission power or rotational speed by slip amount between primary drive wheel and secondary driven wheel
을 실현하여 왔다. Has been realized.
2. 이때, 1차 구동휠과 2차 피동휠 사이의 동력 전달매체인 유체의 양 또는 수준은2. At this time, the amount or level of fluid that is the power transmission medium between the primary drive wheel and the secondary driven wheel
외부 전원에 의해 구동되는 스쿠프 튜브 제어시스템에 의해 제어되었다. Controlled by a scoop tube control system driven by an external power source.
3. 작동유체의 냉각 및 순환을 위한 열교환기, 순환펌프 및 이에 부속한 유체탱크 및 밸브류 등의 설치가 요구 되었다.3. Installation of heat exchangers, circulation pumps and accompanying fluid tanks and valves for cooling and circulation of working fluids was required.
인버터(VVVF)로 가변속 부하 조절하는 소형펌프의 제어를 기계식 자동제어 시스템으로 대체함으로써, 상대적 단순한 시스템으로 고가의 장비 가격 축소, 전기적 제어가 아닌 기계식 제어시스템으로 전기 동력공급 생략, 동력전달의 효율이 향상, 고장으로 인한 가동중단의 빈도 저감 등을 실현한다.By replacing the control of a small pump with variable speed load with an inverter (VVVF) with a mechanical automatic control system, a relatively simple system reduces the cost of expensive equipment, omits the electric power supply to the mechanical control system rather than electrical control, and improves the efficiency of power transmission. Implement improvements and reduce the frequency of downtime due to failures.
본 발명은 내구 신뢰성이 확보된 유체 커플링과 작동유체의 수준을 별도의 전원 공급이 없이 기계적 제어 장치를 통하여 신뢰성을 확보한다.The present invention ensures reliability through a mechanical control device without a separate power supply for the level of fluid coupling and working fluid secured durability.
특히, 소용량에 따른 작동유체의 방열 부하는 펌프측 토출유체의 일부를 순환시키고 케이싱 형상의 표면적을 최대화시킴으로서 대기중 방열 하도록 하여, 냉각 및 순환을 위한 설비 및 동력손실을 없도록 한다. 본 발명은 내구 신뢰성이 확보된 유체 커플링과 작동유체의 수준을 별도의 전원 공급이 없이 기계적 제어 장치를 통하여 신뢰성을 확보한다.In particular, the heat dissipation load of the working fluid according to the small capacity circulates a part of the discharge fluid in the pump side and maximizes the surface area of the casing shape so as to dissipate heat in the atmosphere, so that there is no loss of equipment and power for cooling and circulation. The present invention ensures reliability through a mechanical control device without a separate power supply for the level of fluid coupling and working fluid secured durability.
특히, 소용량에 따른 작동유체의 방열 부하는 펌프측 토출유체의 일부를 순환시키고 케이싱 형상의 표면적을 최대화시킴으로서 대기중 방열 하도록 하여, 냉각 및 순환을 위한 설비 및 동력손실을 없도록 한다.In particular, the heat dissipation load of the working fluid according to the small capacity circulates a part of the discharge fluid in the pump side and maximizes the surface area of the casing shape so as to dissipate heat in the atmosphere, so that there is no loss of equipment and power for cooling and circulation.
1. 소형 가압펌프(50kw 이하)는 인버터(VVVF)로 가변속 부하조절을 하나, 이러한 장비가 활용되는 공간은 대부분 전기사용 장비가 취약한 습도가 높은 외부 환경에 노출되며 밀폐된 규모가 작은 소형 가압 펌프장 등인 까닭에 별도의 관리인력 배치가 비현실적이고, 고장으로 가동중지가 잦아, 적용 대상은 많으나, 실제 운영되는 현장은 많지 않다.1. Small pressure pump (less than 50kw) is controlled by variable speed load with inverter (VVVF), but the space where these equipments are used is exposed to the high humidity environment where electric equipment is vulnerable, and small, compact pressure pump station As such, separate management personnel are unrealistic and frequently shut down due to breakdowns, so there are many applications, but not many sites are actually operated.
2. 특히 각 도시의 상수도 사업본부 등에서 운영하는 많은 숫자의 가압펌프는 인버터의 복잡한 자동 부하제어 시스템과 고비용 장비가격으로 적용이 기피되거나, 적용을 하더라도 효과적인 자동제어 운전이 되고 있지 않다. 따라서 내구성이 좋은 보급형 전천후 부하 자동제어 시스템이 개발되면, 국내 사용되는 모터수량의 50% 이상을 차지하는 소형 가압펌프의 부하 자동제어 운전 및 많은 에너지 절약이 가능하다.2. In particular, a large number of pressurized pumps operated by the city's waterworks headquarters, etc., are avoided due to the complicated automatic load control system of the inverter and the high cost of equipment, and even if applied, they are not effective automatic control operation. Therefore, when a durable, entry-type all-weather load automatic control system is developed, it is possible to automatically control the load of a small pressurized pump that occupies more than 50% of the quantity of motors used in Korea and to save a lot of energy.
3. 본 발명에 따른 동력전달 장치는 유체커플링의 펌프 측 터어빈 휠과 구동모터 측 휠 사이의 슬립의 양을 결정짓는 작동유 또는 작동수의 수준 제어를 펌프의 부하에 다른 펌프 출력 측의 압력을 감지한 신호를 통하여 유지함으로써 결과적으로 구동 모터의 소모 전력량을 조절하여 에너지 효율을 향상시킴과 동시에 신뢰성 확보로 적용 범위가 확장됨에 따른 에너지 절감의 양을 확대시킬 수가 있다.3. The power transmission device according to the present invention controls the level of hydraulic oil or water to determine the amount of slip between the pump side turbine wheel and the drive motor side wheel of the fluid coupling to the pressure of the pump output side to the load of the pump. By maintaining it through the sensed signal, it is possible to improve the energy efficiency by adjusting the power consumption of the driving motor, and at the same time, to increase the amount of energy savings as the application range is extended by securing reliability.
도면 1은 제어장치가 장착된 유체 커플링의 전체 조립도이다.1 is an overall assembly view of a fluid coupling equipped with a control device.
도면 2은 본 발명의 제어장치 구조를 설명하는 개념도이다.2 is a conceptual diagram illustrating a structure of a control device of the present invention.
도면 3는 순환수 재순환을 위한 가이더의 개념도이다.3 is a conceptual diagram of a guider for recirculating water.
본 발명의 목적, 특정한 장점들 및 신규 특징들은 다음의 첨부 도면에서 설명한다.The objects, specific advantages and novel features of the invention are set forth in the accompanying drawings which follow.
도 1은 개략화된 본 발명의 대표도이다. 1 is a representative view of the present invention outlined.
도 2 개념도에서 본 발명의 주요한 구조 및 구성품들을 나타낸다. 1차 구동측 컴프레서 휠(1)는 엔진, 모터 등의 구동원과 연결되어 동력이 입력된다. 입력축의 외측으로는 축을 지지하는 베어링 및 기밀을 유지하기 위한 씰 등이 연결된다. 2 shows the main structure and components of the present invention. The primary drive side compressor wheel 1 is connected to a drive source such as an engine, a motor, and the like, and power is input. Outside the input shaft, a bearing for supporting the shaft and a seal for maintaining the airtightness are connected.
1차 구동측 컴프레서 휠(1)과 마주하는 2차 피동측 터어빈 휠(2)는 1차 구동측 임펠러(1)의 회전수가 중간의 작동유체의 수준에 따라 슬립 양을 발생 시키며 동력을 전달 받는다. 이때 발생되는 슬립의 양을 결정짓는 작동유체의 수준은 탱크(5)로부터 공급되는 작동유체의 양이 펌프의 출력 측에서 감지하는 압력에 의해 제어밸브(6)를 통하여 커플링으로 공급되는 작동유체의 양에 의거 제어된다. 하우징(4)는 커플링 입력축의 플랜지가 구동모터에 연결되고, 커플링 출력축(10)의 플랜지는 펌프와 함께 연결되며, 내측에 유체커플링 어셈블리가 내장되고, 이와 연결되는 펌프측의 토출압을 감지하여 이 압력의 변화량을 통하여 밸브(6)의 개도를 제어함으로써 공급되는 작동유체의 양을 제어하게 된다. 또한 밸브의 기본 셋팅을 지정하는 조정 손잡이(7)가 밸브 스템에 설치되어 있다.The secondary driven side turbine wheel (2) facing the primary drive side compressor wheel (1) generates a slip amount according to the level of the intermediate working fluid and receives power by the rotational speed of the primary drive side impeller (1). . At this time, the level of the working fluid which determines the amount of slip generated is the working fluid supplied to the coupling through the control valve 6 by the pressure of the amount of working fluid supplied from the tank 5 is sensed at the output side of the pump. It is controlled based on the amount of. The housing 4 is a flange of the coupling input shaft is connected to the drive motor, the flange of the coupling output shaft 10 is connected with the pump, the fluid coupling assembly is built in, the discharge pressure of the pump side connected thereto The amount of operating fluid supplied is controlled by controlling the opening degree of the valve 6 through the amount of change in pressure. In addition, an adjustment knob 7 is provided on the valve stem which specifies the basic setting of the valve.
케이싱에는 펌프측 토출유체의 일부를 순환시키면서 작동유체의 냉각을 돕는 파이프 및 열전달 효율을 극대화 시킨 핀이 표면에 부착된 파이프가 또한 내장된다.The casing also includes a pipe that helps to cool the working fluid while circulating a part of the discharge fluid on the pump side, and a pipe having a finned surface that maximizes heat transfer efficiency.
도 3의 개념도는 유체커플링의 작동유체중 케이싱 바닥으로 유입된 작동유체가 휠의 회전에 의해 리턴 되면서, 최종적으로 탱크로 주입되는 원리를 보여준다.The conceptual diagram of FIG. 3 shows the principle that the working fluid introduced to the casing bottom of the working fluid of the fluid coupling is finally returned to the tank while being returned by the rotation of the wheel.
Claims (2)
- 피구동 펌프의 토출 압력에 따라 실린더의 피스톤 변위를 일으키고, 이 변위가 유체커플링의 작동유체의 유량을 제어함으로써 유체커플링의 슬립양을 조절하고, 이를 통한 유체커플링의 전달속도를 제어하는 장치.The piston displacement of the cylinder is caused by the discharge pressure of the driven pump, and the displacement controls the amount of slip of the fluid coupling by controlling the flow rate of the working fluid of the fluid coupling, thereby controlling the delivery speed of the fluid coupling. Device.
- 물 또는 유압유 등의 유체로 작동되며, 속도제어용 밸브, 작동유체 탱크, 작동유체 이송가이더, 냉각핀이 외부의 형상을 이루는 유체커플링 하우징에 펌프의 토출측 액체 일부를 순환시켜 작동유체의 냉각기능을 가진 유로가 하우징에 일체형으로 내장된 유체커플링. It is operated by fluid such as water or hydraulic oil, and the cooling function of the working fluid is circulated by circulating a part of the liquid on the discharge side of the pump to the fluid coupling housing in which the speed control valve, the working fluid tank, the working fluid transfer guide, and the cooling fin form an external shape. Fluid coupling with excitation flow path integrated in the housing.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020170031686A KR101963493B1 (en) | 2017-03-14 | 2017-03-14 | Fluid coupling apparatus equipped with the mechanical speed controlled and nonpowered system for pump |
| KR10-2017-0031686 | 2017-03-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2018169146A1 true WO2018169146A1 (en) | 2018-09-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/KR2017/008863 WO2018169146A1 (en) | 2017-03-14 | 2017-08-16 | Fluid coupling containing power-free mechanical speed control unit for pump |
Country Status (2)
| Country | Link |
|---|---|
| KR (1) | KR101963493B1 (en) |
| WO (1) | WO2018169146A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102074096B1 (en) * | 2019-04-04 | 2020-02-05 | 브이에스이앤지(주) | Control valve, hydraulic coupling apparatus and pump system using the same |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3999385A (en) * | 1975-01-17 | 1976-12-28 | Voith Turbo Kg | Hydrodynamic control coupling |
| US4203829A (en) * | 1978-09-28 | 1980-05-20 | Standard Oil Company (Indiana) | Catalyst, method of preparation and use thereof in hydrodesulfurizing cracked naphtha |
| KR20070024615A (en) * | 2004-06-18 | 2007-03-02 | 보이트 터보 게엠베하 운트 콤파니 카게 | Hydrodynamic coupling and turbocompound system with speed protection |
| KR20070085658A (en) * | 2004-12-10 | 2007-08-27 | 보이트 터보 게엠베하 운트 콤파니 카게 | Method for adjusting maximum speed of operating machine and hydrodynamic coupling therefor |
| KR20080110179A (en) * | 2007-06-14 | 2008-12-18 | 최쌍석 | Variable speed drive using water as a working medium |
| US8341954B2 (en) * | 2006-12-22 | 2013-01-01 | Voith Patent Gmbh | Hydrodynamic coupling |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2748386A1 (en) * | 1977-10-28 | 1979-05-03 | Voith Turbo Kg | HYDRODYNAMIC OPERATING CLUTCH |
-
2017
- 2017-03-14 KR KR1020170031686A patent/KR101963493B1/en active Active
- 2017-08-16 WO PCT/KR2017/008863 patent/WO2018169146A1/en active Application Filing
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3999385A (en) * | 1975-01-17 | 1976-12-28 | Voith Turbo Kg | Hydrodynamic control coupling |
| US4203829A (en) * | 1978-09-28 | 1980-05-20 | Standard Oil Company (Indiana) | Catalyst, method of preparation and use thereof in hydrodesulfurizing cracked naphtha |
| KR20070024615A (en) * | 2004-06-18 | 2007-03-02 | 보이트 터보 게엠베하 운트 콤파니 카게 | Hydrodynamic coupling and turbocompound system with speed protection |
| KR20070085658A (en) * | 2004-12-10 | 2007-08-27 | 보이트 터보 게엠베하 운트 콤파니 카게 | Method for adjusting maximum speed of operating machine and hydrodynamic coupling therefor |
| US8341954B2 (en) * | 2006-12-22 | 2013-01-01 | Voith Patent Gmbh | Hydrodynamic coupling |
| KR20080110179A (en) * | 2007-06-14 | 2008-12-18 | 최쌍석 | Variable speed drive using water as a working medium |
Also Published As
| Publication number | Publication date |
|---|---|
| KR101963493B1 (en) | 2019-03-28 |
| KR20180104865A (en) | 2018-10-01 |
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