baber/WOPTO huggingface dataset:
Patent KR-20120051997-A (KR)
Title: A double-sided cutting insert
Inventor: BHAGATH KEDAR
IPC: B23C5/22
Filed: 2010-11-15
Abstract: PURPOSE: A double-sided cutting insert is provided to implement shoulder milling of 90° to a cutting depth over the length of the cutting insert by preventing a non-operative second cutting edge from protruding than an operative first cutting edge in the radial direction of a milling cutter and maintaining a gap from an object to be cut. CONSTITUTION: A double-sided cutting insert(1) comprises a pair of end faces(10), a pair of first lateral faces(30), and a pair of second lateral faces. The first and second lateral faces, facing each other, connect the end faces. First and second cutting edges(100,200) are formed by the intersection of the first and second lateral faces. The second cutting edge is offset toward a first middle face further than the first cutting edge and inclined toward the first middle face as getting far from the corner of the cutting insert. The first cutting edge is offset toward a second middle face further than the second cutting edge and inclined toward the second middle face as getting far from the corner of the cutting insert.
Patent KR-20120053197-A (KR)
Title: Network system and method for applying security policy using the same
Inventor: MO YOUNG BUM
IPC: H04L12/22
Filed: 2010-11-17
Abstract: PURPOSE: A network system and a method for applying a security policy using the same are provided to improve the connection security of a network by permitting normal network connection to a client in the case that not only user authentication but also preset security policy are satisfied. CONSTITUTION: A DHCP(Dynamic Host Configuration Protocol) server(110) assigns an basic ACL(Access Control List) and DHCP IP to provide a restrictive network connecting authority to an authenticated client. A security server(112) provides a security policy required for network connection to the authenticated client. The security server receives a security check result according to the security policy. A web server(116) transmits the user ACL to provide a network access authority according to the security check result of the client to the client. The client connects to the security server based on the basic ACL.
Patent KR-20120053709-A (KR)
Title: Perfume composition for expressing the fragrance of abeliophyllum distichum flower and the composition for skin external application containing the same
Inventor: LEE EUN JU
IPC: A61P17/00
Filed: 2010-11-18
Abstract: PURPOSE: A perfume composition and an external use skin composition containing the same are provided to improve preference of fragrance. CONSTITUTION: A perfume composition which reproduces fragrance of Abeliophyllum distichum flower contains 50-75 wt% of Abeliophyllum distichum flower fragrance having 32-48 wt% of lilac aldehyde, 10-15 wt% of ocimene,3-4.5 wt% of benzaldehyde, and 5-7.5 wt% of linalool and further contains 6-10 wt% of beta-ionone and2-5 wt% of acetophenone. An external use skin composition contains the perfume composition.
Patent KR-20120059760-A (KR)
Inventor: YANG YEON MO
IPC: G01L17/00
Filed: 2010-12-01
Abstract: PURPOSE: A non powered tire pressure monitoring apparatus and mechanism are provided to indicate tire pressure to a driver without embedding a power source part. CONSTITUTION: A non powered tire pressure monitoring apparatus comprises a RF receiver(210), a mechanical filter(220), a PZT MEMS pressure sensor(230), and an operating power source part(240). The RF receiver distinguishes high frequency signals and low frequency signals from RF signals. The mechanical filter filters the signals in specific range from the high frequency signals. The mechanical filter generates the filtered high frequency signals. The PZT MEMS pressure sensor senses tire pressure and converts the filtered high frequency signals based on tire pressure. The operating power source part supplies driving power by using the low frequency signals.
Patent KR-20120064279-A (KR)
Title: Nitriding method of metal component
Inventor: SHIN HAK SOO
IPC: C23C8/24
Filed: 2010-12-09
Abstract: PURPOSE: A metal part nitriding method is provided to implement tempering and plating at a time by temper-nitriding a metal part, thereby reducing production processes. CONSTITUTION: A metal part nitriding method comprises the steps of: quenching a metal part, temper-nitriding the metal part, and maintaining the metal part at a temperature of 600-700 degrees in a mixed gas atmosphere of oxidative gas and nitrogen for 30 minutes or longer so that a nitride compound layer(200) is formed in the surface of the metal part.
Patent KR-20120067028-A (KR)
Title: Ambient pressure type multi-effect distiller using solar thermal energy and waste heat
Inventor: PARK CHANG DAE
IPC: C02F1/14
Filed: 2010-12-15
Abstract: PURPOSE: An ambient pressure type multi-functional desalination apparatus using solar heat and waste heat is provided to save costs required for the initial installation and the maintenance of the apparatus and to improve energy efficiency. CONSTITUTION: An ambient pressure type multi-functional desalination apparatus(100) using solar heat and waste heat includes a seawater storing bath(300), an evaporation and desalination part(200), and an ambient pressure multi-functional desalination part. The evaporation and desalination part includes a waste heat supplying part(230), a transparent cover(240), and a desalinated water collecting channel(400). The waste heat supplying part is installed at the seawater storing bath and supplies waste heat. The transparent cover is slantly arranged at the upper side of the seawater storing bath and transmits solar light. Evaporated seawater is condensed at the lower side of the transparent cover. The desalinated water collecting channel is arranged at one side of the seawater storing bath. The desalination part includes a plurality of plates and wicks. The plates are separately installed to the vertical direction of the sweater storing bath. The wicks are attached to the plates, and seawater flows along the wicks to be evaporated.
Patent KR-20120067223-A (KR)
Title: Deduction apparatus of fuel gauge for overfill volume
Inventor: LEE YOUNG SAM
IPC: B60K37/00
Filed: 2010-12-15
Abstract: PURPOSE: A fuel gage device indicating fuel consumption by calculating excessive fuel amount is provided to prevent the rapid change of residual fuel quantity through adding an excessive fuel amount additional factor in case of the indication limit of a residual quantity detection sensor is detected and indicating the excessive fuel amount by linear reduction calculation by using fuel consumption signals until the residual amount under the limit value is detected. CONSTITUTION: A fuel gage device(20) indicating fuel consumption by calculating excessive fuel amount comprises a residual quantity detection sensor(4), an engine ECU(22), a data storage unit(24), a display unit(6), a display driving unit(8), and a control unit(26). The engine ECU sanctions the amount of fuel consumption signal. The data storage unit saves indication limit values, excessive fuel amount additional parameter values, and indication fuel amount quantity conversion information of each vehicle. The control unit controls the indication of the excessive fuel amount by linear reduction calculation.
Patent KR-20120071514-A (KR)
Title: Method of mobility management in cellular mobile communication network
Inventor: PARK SOON GI
IPC: H04W36/30
Filed: 2010-12-23
Abstract: PURPOSE: A mobility management method in a cellular mobile communication system is provided to reduce unnecessary handover procedures and handover failure number by controlling a handover priority. CONSTITUTION: A second base station measures the dwell time of a terminal which hands data over from a first base station to a second base station(S310). In case the dwell time is lower than a predetermined threshold value, the second base station transmits messages including the dwell time to a first base station(S320). The first base station accumulatively manages one or more information. A handover candidate priority for the first and the second base station is changed based on the accumulated information(S330).
Patent KR-20120073458-A (KR)
Title: Height inspection apparatus for fluorescent substance of light emitting diod component
Inventor: MOON JAE HO
IPC: G01B11/06
Filed: 2010-12-27
Abstract: PURPOSE: A device for inspecting a height of fluorescent substances of a LED component is provided to accurately measure whether a component is faulty or not by measuring a height or existence spread of fluorescent substances on a LED component. CONSTITUTION: A device for inspecting a height of fluorescent substances of a LED component comprises a stage unit, a lighting unit, and a camera unit. The stage unit fixes or transfers an inspection object on an inspection position. The lighting unit is arranged in the upper part of the stage unit. The lighting unit provides lights on the inspection object. The camera unit photographs images reflected by the inspection object. The lighting unit is constituted to irradiate lights of an absorbent wavelength band of fluorescent substances(10) covering an emitting device of a LED component.
Patent KR-20120076972-A (KR)
Title: Retarder for image display device and 3d image display device including the same and 3d image realization system including the same
Inventor: SON HYEON HO
IPC: G02B27/22
Filed: 2010-12-30
Abstract: PURPOSE: A patterned retarder and a 3D image display device with the same, and a 3D image forming system are provided to form a base layer with birefringence for a phase delay of 1/4 wavelength and a patterned retarder layer for a phase delay of 1/2 wavelength, thereby preventing light leakage and crosstalk. CONSTITUTION: A base layer(145) has birefringence for a phase delay of 1/4 wavelength. A patterned retarder layer(143) is formed in a lower portion of the base layer. The patterned retarder layer comprises a pattern with different optical axes for a phase delay for 1/2 wavelength. An adhesive layer(141) is formed in a lower part of the patterned retarder layer. A surface processing layer(149) reduces reflection due to external light.
Patent KR-20100047217-A (KR)
Title: System, method and apparatus having improved pulse width modulation frequency resolution
Inventor: KRIS BRYAN
IPC: H03K7/08
Filed: 2008-06-27
Abstract: Using a combination of frequency dithering of a PWM counter and a variable time delay circuit yields improved PWM frequency resolution with realizable circuit components and clock operating frequencies. A controllable time delay circuit lengthens a PWM signal during the first PWM cycle. During the second PWM cycle, the PWM period is increased beyond the desired amount, but the delay is reduced during this second PWM cycle to achieve the correct (desired) PWM signal period. The dithering of the PWM signal period enables the time delay circuit to be "reset" so that an infinite delay circuit is not required. The time delay circuit provides short term (one cycle) frequency adjustment so that the resulting PWM cycle is not dithered and has a period at the desired frequency resolution.
Patent KR-20100037112-A (KR)
Title: Induction heater
Inventor: FUELBIER CHRISTOPH
IPC: H05B6/02
Filed: 2008-07-10
Abstract: An induction heater for heating metallic billets 10 having a yoke with an E-shaped cross section, on whose centre limb 143 a superconducting coil 121 is seated, in each case has a shaft between the centre limb 143 and the two outer limbs 142 l, 142 r. A billet 10 can in each case be heated by rotation in the two shafts 142 l, 142 r.
Patent KR-20100044232-A (KR)
Title: Reinforced and conductive resin compositions comprising polyolefins and poly (hydroxy carboxylic acid)
Inventor: DEBRAS GUY
IPC: C08K3/04
Filed: 2008-08-25
Abstract: A resin composition comprising a polyolefin, carbon nanotubes and poly(hydroxy carboxylic acid). The invention also covers a process for preparing a resin composition comprising a polyolefin, carbon nanotubes and poly(hydroxy carboxylic acid) by (i) blending a poly(hydroxy carboxylic acid) with carbon nanotubes to form a composite (ii) blending the composite with a polyolefin. The use of poly(hydroxy carboxylic acids) as a compatibiliser to blend carbon nanotubes into polyolefins is also claimed.
Patent KR-20100054153-A (KR)
Title: Charging circuit, and battery pack and charging system equipped with same
Inventor: TANIGUCHI KEITARO
IPC: H01M50/569
Filed: 2008-07-31
Abstract: A charging circuit is provided with a battery connecting terminal for connecting a secondary battery; an electric power connecting terminal for receiving an electric current to charge the secondary battery from an electric power source unit; first and second switching elements serially connected between the electric power connecting terminal and the battery connecting terminal to switch on or off the flow of the electric current from the electric power connecting terminal to the battery connecting terminal; an electric current detecting unit for detecting the flow of the electric current from the electric power connecting terminal to the battery connecting terminal; a charging control unit for supplying the battery connecting terminal with a pulse-like charging electric current by repeating a step for turning on the first and second switching elements, a step for turning on the first switching element while turning off the second switching element, and a step for turning off the first switching element while turning on the second switching element; and a fault judging unit for judging that at least one of the first and second switching elements is out of order in the case where the electric current detected by the electric current detecting unit is more than an electric current threshold value set for judging if there is the flow of an electric current to the battery connecting terminal during such a period that either one of the first and second switching elements is only turned on by the charging control unit.
Patent KR-20100065372-A (KR)
Title: Device and method for generating a multi-channel signal using voice signal processing
Inventor: UHLE CHRISTIAN
IPC: G10L19/00
Filed: 2008-10-01
Abstract: To generate a multi-channel signal with a number of output channels that is greater than a number of input channels, a mixer is used to upmix the input signal into at least one direct channel signal and at least one surround channel signal. The device is equipped with a voice detector (18) for detecting a section of the input signal, the direct signal, or the surround channel signal, in which voice portions are present. A signal modifier (20) modifies the input signal or the surround channel signal on the basis of said detection to damp voice portions in the surround channel signal, whilst voice portions of this type are damped to a lesser degree in the direct channel signal or are not damped at all. A loudspeaker signal output system (22) projects the direct channel signals and the surround channel signals onto loudspeaker signals that are associated with a defined reproduction system, such as a 5.1 system.
Patent KR-20100102626-A (KR)
Inventor: BARNES DAVID
IPC: A61K38/27
Filed: 2008-12-01
Abstract: 본 발명은 근골격계 질환의 치료를 위한, 특히 근 위축의 치료를 위한 단백질 티로신 포스파타제 억제제 및 인간 성장 호르몬의 조합물의 용도에 관한 것이다.
Patent KR-20100117643-A (KR)
Inventor: KHANDEKAR AAMOD
IPC: H04W16/10
Filed: 2008-11-10
Abstract: 무선 액세스 네트워크(AN)의 무선 액세스 포인트들(AP들) 사이의 백홀 시그널링을 이용하여 간섭 감소 및/또는 회피를 제공하는 것이 본원에서 기술된다.  예를 들어, 간섭 회피 요청(IAR)은 이웃하는 AP들에 의한 순방향 링크(FL) 및/또는 역방향 링크(RL) 송신들 상에서 신호 간섭을 감소시키기 위해 AP에 의해 발(issue)해질 수 있다.  IAR은 백홀 네트워크를 통해 그리고/또는 AP 또는 하나 이상의 간섭 AP들과 결합된 액세스 단말들(AT들)을 통해 OTA로 라우팅될 수 있다.  IAR을 수신할 때, 간섭 AP는 FL 및/또는 RL 송신들에 대한 감소된 송신 전력 레벨들을 결정하고 IAR에 응답할 수 있다.  이러한 응답은 감소된 전력 레벨들을 포함할 수 있고 백홀 네트워크를 통해 또는 OTA로 전송될 수 있다.  백홀 네트워크를 완전히 또는 부분적으로 이용함으로써, 간섭 회피는 백홀 네트워크에 의해 결합된 반-계획 또는 미-계획 이종 네트워크들에 대해서도 수행될 수 있다.
Patent KR-20100119801-A (KR)
Inventor: TONOMORI RIE
IPC: F21S2/00
Filed: 2007-05-29
Abstract: 본 발명은 방전관, 내관 및 외관을 갖는 3중 관 구조의 금속증기 방전램프에 관한 것으로, 상기 내관의 축과 상기 외관의 축이 어긋나는 것을 억제하는 것을 목적으로 한다. 
금속증기 방전램프(14)는 내부에 한 쌍의 전극을 구비하는 방전관(30)과, 일 단부에 핀치시일부(86)를 갖고, 상기 방전관을 기밀하게 수납하는 내관(32)과, 상기 내관을 수용하는 외관(34)과, 베이스(36)로 구성된다. 상기 내관과 상기 외관 사이의 간극에는 상기 내관과 상기 외관이 상기 금속증기 방전램프의 축과 직교하는 방향으로 상대적으로 이동하는 것을 규제하는 규제 부재(37)가 배치된다.
Patent KR-20110007108-A (KR)
Inventor: SAKURABA TAKAMITSU
IPC: F24H9/02
Filed: 2009-03-03
Abstract: 플라스틱제의 온수 순환 방열기에 있어서, 열효율이 좋고, 디자인성도 뛰어난 방열기를 얻는다. 같은 지름 같은 길이의 다수의 플라스틱제 세로파이프(8B)군을 병렬 배치하고, 상단 및 하단을 플라스틱제 가로파이프(8A)에 의해서 연이어 통해지게 하고, 하단의 가로 파이프(8A)에 온수 공급구(8S) 및 온수 배출구(8R)를 부설한, 전체 플라스틱제 수지제의 파이프로 이루어지는 온수 순환 방열패널{81(82)}로, 노출된 방열기(8)를 구성한다.
Patent KR-20110007140-A (KR)
Inventor: SAYRE JAY
IPC: C08G18/32
Filed: 2009-03-16
Abstract: 본원은 리바운드 제어에 협조하기 위해 약 0.05 이상의 tanδ를 가진 에너지 흡수 재료로 된 초탄성 부재를 포함하는 충격 감쇠기 시스템에 관한 것이다.
Patent KR-20100132044-A (KR)
Inventor: SATO KOJI
IPC: H01L23/48
Filed: 2009-03-30
Abstract: Ni를 3.3질량% 이상 5.0질량% 이하 함유하고, Si의 함유량이 Ni와 Si의 질량비(Ni/Si)로 2 8∼3.8의 범위이며, Mg를 0.01∼0.2질량%, Sn을 0.05∼1.5질량%, Zn을 0.2∼1.5질량% 함유하고, 잔부가 Cu 및 불가피 불순물로 이루어지는 전기전자기기용 동합금 재료로서, 두께 t=0.20mm, 폭 w=2.0mm의 시험편에 대해서 휨 반지름 R=0.1mm의 90°W 휨을 행하였을 때, 균열이 생기지 않는 전기전자기기용 동합금 재료; 및, 그것을 가공하여 이루어지는 전기전자부품.
Patent KR-20110030505-A (KR)
Inventor: SHKEDI ROY
IPC: H04N7/173
Filed: 2009-06-02
Abstract: 컴퓨터에 의해 구현되는 자동화 방법은 텔레비전 프로그램 또는 텔레비전 채널과 연계하여, 선택된 텔레비전 광고의 제시를 자동으로 조정하는 단계를 포함한다. 온라인 사용자 프로필과 텔레비전 프로그램(또는 텔레비전 채널) 간의 관계가 식별되며, 상기 관계는 온라인 사용자 프로필의 정보를 부분적으로 또는 전적으로 기초로 한다. 상기 텔레비전 광고는 온라인 사용자 프로필의 정보를 부분적으로 또는 전적으로 기초로 하여 선택된다. 선택된 텔레비전 광고는, 온라인 사용자 프로필과 연계된 해당 셋-톱 박스 식별자를 갖는 셋-톱 박스를 통해, 온라인 사용자 프로필과 관련성이 있다고 식별된 텔레비전 프로그램이나 텔레비전 채널과 연계하여, 제시된다.
Patent KR-20110025673-A (KR)
Inventor: PARKS CHRISTOPHER
IPC: H04N5/369
Filed: 2009-05-12
Abstract: CMOS 이미지 센서 또는 다른 타입의 이미지 센서는 픽셀 어레이, 및 픽셀 어레이와 연관되는 샘플링 및 판독 회로를 포함한다.  픽셀 어레이의 픽셀들의 선택된 그룹에서 하나 이상의 픽셀들의 판독과 함께, 어레이의 픽셀 전력 라인 신호가 비활성 상태에서 활성 상태로 전환되고, 픽셀 어레이의 픽셀들의 선택되지 않은 그룹의 리셋 신호는 픽셀 전력 라인 신호의 자신의 비활성 상태로부터 자신의 활성 상태로의 전환 이전에 미리 결정된 시간 내에 활성 상태로부터 비활성 상태로 전환한다.  이러한 정렬은 바람직하게 이미지 센서의 웰 바운스를 감소시킨다.  이미지 센서는 디지털 카메라 또는 다른 타입의 디지털 이미징 디바이스에서 구현될 수 있다.
Patent KR-20120080749-A (KR)
Inventor: ROH EUN JU
IPC: G09B19/08
Filed: 2011-01-10
Abstract: 본 발명은 외국어 단어나 숙어 또는 문장을 효과적으로 암기할 수 있도록 구성된 외국어 암기장에 관한 것으로, 먼저 외국어와 그 외국어에 해당되는 한국어 해석을 학습한 후, 1단계로 표시된 외국어를 보고 이에 해당되는 한국어 해석을 기재하고, 2단계로 표시된 한국어 해석을 보고 외국어를 기재하며, 3단계로 기재된 외국어를 보고 한글해석을 기재함으로써 반복학습을 통한 외국어 암기가 가능하며, 각각의 단계마다 암기장의 낱장을 순서대로 접어가면서 학습함에 따라 암기에 대한 흥미를 유발시킬 수 있으며, 외국어 또는 한국어 한쪽이 완전히 가려진 상태에서 암기학습이 진행됨에 따라 부족 부분을 효과적으로 학습할 수 있는 외국어 암기장에 관한 것이다. 
본 발명의 바람직한 일 실시예에 따른 외국어 암기장은 다수의 낱장으로 구성된 외국어 암기장에 있어서, 상기 외국어 암기장 낱장의 앞면 좌측에 세로방향으로 표시되되 내측에 학습할 외국어가 차례로 표시되는 외국어 표시칸과, 상기 외국어 암기장 낱장의 앞면 중앙에 세로방향으로 표시되되 상기 외국어 표시칸에 표시된 외국어에 대한 한국어해석이 차례로 표시되는 한국어 해석칸과, 상기 외국어 암기장 낱장의 뒷면 우측에 세로방향 공란으로 표시되며 상기 외국어 표시칸에 표시되는 외국어를 보고 이에 해당되는 한국어 해석이 차례로 기재되는 1단계 학습칸과, 상기 외국어 암기장 낱장의 앞면 우측에 세로방향 공란으로 표시되며 상기 한국어 해석칸에 표시되는 한국어 해석을 보고 이에 해당되는 외국어가 차례로 기재되는 2단계 학습칸과, 상기 외국어 암기장 낱장의 뒷면 우측에 세로방향 공란으로 표시되며, 상기 2단계 학습칸에 기재된 외국어를 보고 이에 해당되는 한국어 해석이 차례로 기재되는 3단계 학습칸을 포함하여 이루어지는 것을 특징으로 한다.
Patent KR-20120082766-A (KR)
Title: Ieaves powder energy
Inventor: SIN CHANG HUN
IPC: B09B3/00
Filed: 2011-01-14
Abstract: PURPOSE: Renewable energy based on fallen leaves powder is provided to save costs required for treating fallen leaves and to clean surrounding environment by pulverizing the fallen leaves into powder and using a dedicated heater for the fallen leave powder. CONSTITUTION: Renewable energy based on fallen leave powder is obtained the following: fallen leaves(1) are collected; the collected fallen leaves are pulverized into powder using an industrial pulverizing device(2); and the fallen leave powder(3) is naturally dried and stored.
Patent KR-20120085505-A (KR)
Title: Separation method of silicate salt and fluoride salt from fluorosilicic acid
Inventor: KIM JONG KIM
IPC: C01B9/08
Filed: 2011-01-24
Abstract: PURPOSE: A method for separating fluorosilicic acid into fluoride salts and silicate is provided to improve the yield of silicate by simply separating silicate for manufacturing nano-porous silica. CONSTITUTION: A method for separating fluorosilicic acid into fluoride salts and silicate includes the following: hydroxide(MOH) or carbonate(M_2CO_3), the compound of an alkali metal, is reacted with reactive formula 1 or reactive formula 2; fluoride salt(MF) and silicate(M_2O·xSiO_2, x is 2.00-4.00) are obtained from the reaction; and the resultant products are cooled and aged; the products are filtered to separate the silicate. In reactive formulas, a is between 6.30 and 7.00, inclusively; and b is 3.15 and 3.50, inclusively.
Patent KR-20120090265-A (KR)
Title: Price search system for mobile terminal and searching method thereof
Inventor: KIM JONG HOON
IPC: G06Q30/06
Filed: 2011-02-07
Abstract: PURPOSE: A price search system for a mobile terminal and a search method thereof are provided to display a purchase product of a given distance which is called point of interest and price information through a location based on price search device, thereby easily helping a purchase decision of a user. CONSTITUTION: A price information server(16) includes the following steps. A map providing server(18) provides a service related to a business place location registered in the cost information server. A POI database server(20) manages purchase products in a business place registered the cost information server. A price information database server(22) respectively maintains expense data of users. The price information database server manages sharing data about a cost for helping a decision of a buyer.
Patent KR-20120096370-A (KR)
Title: Nano bubbles generating device including underwater sound and vibration member
Inventor: NO MYEONG AE
IPC: A61H23/00
Filed: 2011-02-22
Abstract: PURPOSE: A nano bubble generator with a hydroacoustic oscillating element is provided to prevent overload and malfunction of a circulating pump by preventing idling of the circulation pump. CONSTITUTION: A nano bubble generator with a hydroacoustic oscillating element comprises a main body(100'), a liquid suction part(110), a circulating pump(120), a gas-liquid mixing tube(130), a pressure tank(140), a water tank(160), a gas-liquid exhaust tube(170), and a nano bubble jetting head assembly(200). In the main body a space is formed. The liquid suction part is formed in a lower part of the main body. The circulating pump sucks water through a liquid suction part. The gas-liquid mixing tube is installed in a connection part of the circulating pump and the liquid suction part. The pressure tank connects to the circulating pump through a gas-liquid transfer tube. The water tank supplies a constant amount of water to the circulating pump. The gas-liquid exhaust tube is connected to the pressure tank. The nano bubble jetting head assembly is connected to the gas-liquid exhaust tube for generating nano bubbles. An electronic controller is installed in a middle of a suction hose. A check valve prevents a countercurrent of water when the circulating pump is stopped.