baber/WOPTO huggingface dataset:
Patent KR-20150125493-A (KR)
Inventor: CHOI YOUNG SHIG
IPC: H03L7/093
Filed: 2014-04-30
Abstract: The present invention relates to a phase fixing loop device including multiple negative feedback loops and, more specifically, to a phase fixing loop device including multiple negative feedback loops, capable of fixing a phase and a frequency of an output signal, outputted from a voltage control oscillator by forming two negative loops. To achieve the purpose, the device includes an external negative feedback loop fixing a phase and a frequency of an output signal, determined by outputting a voltage corresponding to a phase difference and a frequency difference, by relatively comparing a reference signal to a division signal of the output signal, outputted from the voltage control oscillator; and an internal negative feedback loop sensing a frequency change by receiving the frequency of the output signal by comprising an independent negative feedback loop from the external negative feedback loop, and outputting a voltage corresponding to the frequency change. According to a predetermined range of first and second slope values of the voltage control oscillator, the external negative feedback loop is a main negative feedback, and the internal negative feedback loop is a sub negative feedback loop.
Patent KR-20150126457-A (KR)
Inventor: PARK CHUL
IPC: G06F3/041
Filed: 2014-05-02
Abstract: 정진석 터치스크린을 장착한 전작시기의 카바글라스의 데코레이션에 있어서, 데코레이션을 고급화 하기 위해 금속 박막을 코팅해서 사용하되, 정전식 터치스크린의 동작을 방해하지 않게 하기 위해 금속 박막위에 인쇄고형층을 형성한 다음 금속 에칭을 통해서 전기적으로 졀연이 된 다수개의 금속 박막 도형으로 에칭을 하며, 에칭이 된 금속 박막 도형위에 잉크로 인쇄를 하는 카바글라스이다. 
더우기 금속박막도형 사이의 절연간극층을 주석으로 코팅을 해서 전기적으로는 절연되면서 금속 효과를 내는 데코레이션 효과를 가지는 카바글라스 구조이다.
Patent KR-20150131613-A (KR)
Title: Ocher panel manufacturing equipment
Inventor: JUNG HEE DAE
IPC: B28B3/02
Filed: 2014-05-15
Abstract: The present invention relates to an apparatus for manufacturing a loess panel. The apparatus of the present invention comprises: a main frame (10) made of a metal material having a frame structure; a loess supply unit (20) which is installed on one end of the main frame (10), and supplies loess into a mold (403) while being reciprocated by a first cylinder (202); a panel forming unit (30) which is installed on the other end of the main frame (10), and presses and molds a loess panel (50) by applying pressure to the mold (403) in which a panel material is supplied by using a press (301); and a mold unit (40) which is installed in the center portion of the main frame (10), injects the mold (403), which receives the loess from the loess supply unit (20), into the panel forming unit (30) while being reciprocated by a second cylinder (402), and discharges the loess panel (50), in which molding is completed in the panel forming unit (30), to the outside of the panel forming unit (30). Accordingly, the apparatus for manufacturing a loess panel, according to the present invention, can manufacture the loess panel (50) having a multi-layer structure in which both surfaces are finished with different finishing materials.
Patent KR-20150133408-A (KR)
Title: Installation condition for electric mortor for double inlet blower
Inventor: KIM JAE WON
IPC: F04D29/66
Filed: 2014-05-20
Abstract: The present invention relates to an installation structure of a driving motor for a blower fan. According to the present invention, the installation structure of a driving motor for a double inlet blower fan includes: an impeller sucking air through both sides in an axial direction and discharging the air in a radial direction, wherein the center in the axial direction is divided by a partition; a case enclosing the outside of the impeller and having an air inlet and a discharge guide unit, wherein the air inlet for supplying the air to the both sides of the impeller is formed on both sides of the case and the discharge guide unit guides the air discharged in the radial direction of the impeller to the outside; and a driving motor installed on one side of the impeller and rotating the impeller by being connected to the center of the partition. A part of the driving motor is inserted into the one side of the impeller. According to the present invention, the installation structure of the driving motor can provide an optimal position for the driving motor to have an excellent flow rate of intake air in case the driving motor is installed on either inlet of the double inlet impeller.
Patent KR-20150134828-A (KR)
Title: Method for preparing astaxanthin monoesters
Inventor: LEE CHOUL GYUN
IPC: C07C67/08
Filed: 2014-05-23
Abstract: The present invention relates to astaxanthin monoester. Provided is a monoester-formed astaxanthin which is stable to heat and oxygen, has excellent oral absorbent properties, and is well absorbed into fish, thereby having excellent usability of feed.
Patent KR-20150139114-A (KR)
Inventor: JEON BYUNG JOO
IPC: C08L63/00
Filed: 2014-06-02
Abstract: The present invention provides polylactic acid (PLA)-based resin foam, which contains a polylactic acid-based resin and has 60-90% of opened porosity according to an ASTM D6226 condition. The present invention further provides a production method thereof.
Patent KR-20150139715-A (KR)
Inventor: SHIN HO CHUL
IPC: G06Q50/10
Filed: 2014-06-03
Abstract: The present invention relates to a multiplay game system, and an apparatus and a method for providing a multiplay game in the system. Before starting the multiply game, action logs of other users who will play the multiplay game together are received from a service apparatus and are stored in advance. When the multiplay game is started, actions of other users are rendered on a current game execution screen by using prestored action logs of other users without performing communications with the service apparatus. Therefore, error of execution of the multiplay game caused by an unstable network state can be prevented by providing a multimedia game independently from a network state.
Patent KR-20150139727-A (KR)
Title: 창호시스템
Inventor: SONG MEUNG JIN
IPC: E06B3/46
Filed: 2014-06-03
Abstract: 본 발명은 창호시스템에 관한 것으로서, 상호 나란하게 배치되도록 건물벽체에 설치된 상부창호프레임 및 하부창호프레임과 상기 상부창호프레임의 저면에 길이방향을 따라 상호 나란하게 형성된 내창문상부안내레일 및 외창문상부안내레일과 상기 하부창호프레임의 상면에 길이방향을 따라 상호 나란하게 형성된 내창문하부안내레일 및 외창문하부안내레일을 구비한 창호프레임과, 상면에 요형 단면의 내창문레일홈이 형성되어 있는 상부내창문틀과 상기 상부내창문틀에 나란하게 배치되고 저면에는 내창문롤러홈이 길이방향을 따라 형성되어 있는 하부내창문틀과 상기 상부내창문틀과 상기 하부내창문틀과 협조하여 직사각형 형태를 이루도록 상기 상부내창문틀과 상기 하부내창문틀에 결합된 우측내창문틀 및 좌측내창문틀을 구비한 내창문틀과 상기 내창문롤러홈에 설치된 내창문롤러와 상기 내창문틀의 개구영역을 폐쇄하도록 상기 내창문틀에 설치된 내유리창을 가지고 상기 내창문롤러가 상기 내창문하부안내레일에 안착되고 상기 내창문레일홈에 상기 내창문상부안내레일이 진입하도록 상기 창호프레임에 설치된 내창문과, 상면에 요형 단면의 외창문레일홈이 형성되어 있는 상부외창문틀과 상기 상부외창문틀에 나란하게 배치되고 저면에는 외창문롤러홈이 길이방향을 따라 형성되어 있는 하부외창문틀과 상기 상부외창문틀과 상기 하부외창문틀과 협조하여 직사각형 형태를 이루도록 상기 상부외창문틀과 상기 하부외창문틀에 결합된 우측외창문틀 및 좌측외창문틀을 구비한 외창문틀과 상기 외창문롤러홈에 설치된 외창문롤러와 상기 외창문틀의 개구영역을 폐쇄하도록 상기 외창문틀에 설치된 외유리창을 가지고 상기 외창문롤러가 상기 외창문하부안내레일에 안착되고 상기 외창문레일홈에 상기 외창문상부안내레일이 진입하도록 상기 창호프레임에 설치된 외창문을 갖는 창호시스템에 있어서, 상기 하부창호프레임은 직사각형 형태의 하부내프레임바닥면부와 상기 하부내프레임바닥면부의 장변 중 일방으로부터 수직으로 절곡 형성된 하부내프레임내벽부와 상기 하부내프레임내벽부보다 낮은 높이로 상기 하부내프레임내벽부에 나란하도록 상기 하부내프레임바닥면부의 장변 중 나머지 일방으로부터 연장 형성된 하부내프레임외벽부와 상기 하부내프레임외벽부로부터 상기 하부내프레임바닥면부에 나란하도록 연장 형성된 하부내프레임지지면부와 상기 하부내프레임지지면부로부터 상기 하부내프레임내벽부에 나란하도록 연장형성된 하부내프레임중간벽부와 상기 하부내프레임중간벽부의 상단과 상기 하부내프레임내벽부의 상단을 연결하도록 형성된 하부내프레임천정면부를 가지고 상기 하부내프레임중간벽부가 상기 내창문롤러홈에 대향하도록 설치되는 하부내프레임과, 직사각형 형태의 하부외프레임바닥면부와 상기 하부외프레임바닥면부의 장변 중 일방으로부터 수직으로 절곡 형성된 하부외프레임외벽부와 상기 하부외프레임외벽부보다 낮은 높이로 상기 하부외프레임외벽부에 나란하도록 상기 하부외프레임바닥면부의 장변 중 나머지 일방으로부터 연장 형성된 하부외프레임내벽부와 상기 하부외프레임내벽부로부터 상기 하부외프레임바닥면부에 나란하도록 연장 형성된 하부외프레임지지면부와 상기 하부외프레임지지면부로부터 상기 하부외프레임외벽부에 나란하도록 연장형성된 하부외프레임중간벽부와 상기 하부외프레임중간벽부의 상단과 상기 하부외프레임외벽부의 상단을 연결하도록 형성된 하부외프레임천정면부를 가지고 상기 하부외프레임중간벽부가 상기 외창문롤러홈에 대향하도록 설치되는 하부외프레임과, 상기 하부외프레임중간벽부와 상기 하부내프레임중간벽부 사이에 대응하는 폭을 가지고 내측에서 외측을 향해 가면서 하향경사를 이루도록 상면이 형성되어 있는 직사각형 형태의 하부중간프레임바닥면부와 상기 하부중간프레임바닥면부의 장변 중 일방으로부터 상기 하부내프레임중간벽부보다 높은 높이로 수직으로 절곡 형성된 하부중간프레임내벽부와 상기 하부중간프레임바닥면부의 장변 중 나머지 일방으로부터 상기 하부외프레임중간벽부보다 높은 높이로 수직으로 절곡 형성된 하부중간프레임외벽부와 상기 하부중간프레임외벽부와 상기 하부중간프레임내벽부 사이에서 상기 하부중간프레임외벽부에 나란하도록 상기 하부중간프레임바닥면부의 상면에 기립형성된 하부중간프레임중간벽부를 가지고  상기 하부중간프레임바닥면부가 상기 하부외프레임중간벽부와 상기 하부내프레임중간벽부 사이에 진입하고 상기 하부중간프레임중간벽부가 상기 하부내창문틀과 상기 하부외창문틀 사이에 배치되도록 설치되는 하부중간프레임을 포함하고; 상기 내창문하부안내레일은 상기 내창문롤러홈을 향해 상기 하부내프레임천정면부의 상면에 기립 형성되어 있는 내창문하부안내레일벽부와 상기 내창문하부안내레일벽부의 상단으로부터 외측을 향해 수직으로 절곡형성된 내창문하부안내레일지지면부와 상기 내창문하부안내레일지지면부의 상면에 돌출형성된 원호단면의 내창문롤러지지리브와 상기 내창문하부안내레일지지면부의 종단에 형성된 하부중간프레임내벽부지지홈부를 가지고, 상기 내창문롤러지지리브가 상기 내창문롤러의 요홈에 접촉하고 상기 내창문하부안내레일지지면부의 상면에 상기 내창문롤러가 지지되고 상기 하부중간프레임내벽부지지홈부를 통해 상기 하부중간프레임내벽부의 상단에 지지되도록 설치되고; 상기 외창문하부안내레일은 상기 외창문롤러홈을 향해 상기 하부외프레임천정면부의 상면에 기립 형성된 외창문하부안내레일벽부와 상기 내창문하부안내레일벽부의 상단으로부터 내측을 향해 수직으로 절곡형성된 외창문하부안내레일지지면부와 상기 외창문하부안내레일지지면부의 상면에 돌출형성된 원호단면의 외창문롤러지지리브와 상기 외창문하부안내레일지지면부의 종단에 형성된 하부중간프레임외벽부지지홈부를 가지고, 상기 외창문롤러지지리브가 상기 외창문롤러의 요홈에 접촉하고 상기 외창문하부안내레일지지면부의 상면에 상기 외창문롤러가 지지되고 상기 하부중간프레임외벽부지지홈부를 통해 상기 하부중간프레임외벽부의 상단에 지지되도록 설치되는 것을 특징으로 한다. 이에 의해, 내창문하부안내레일과 외창문하부안내레일의 구조와 조립작업이 간단하고 내창문하부안내레일과 외창문하부안내레일에 의해 외창문과 내창문의 직선 이동을 안정적으로 안내할 수 있게 된다.
Patent KR-20150144105-A (KR)
Inventor: LEE CHANG MIN
IPC: C07C271/30
Filed: 2014-06-16
Abstract: The present invention relates to a high refractive oligomer, a resin composition for molding a prism sheet containing the same, and a prism sheet using the same. The present invention provides a low viscosity and low yellowing type highly refractive oligomer, which comprises acryl functional groups on both terminus and contains at least two urethane functional groups in a molecular structure, and meets a refractive index higher than 1.61, and provides a prism sheet embodying a high refractive index and low viscosity of a liquid before curing and having excellent transparence and yellowing resistance, and meeting excellent adhesive strength and pencil hardness after curing through the resin composition for molding the prism sheet containing the highly refractive oligomer or an optimized mixing ratio between the highly refractive oligomer and highly refractive monomer. Accordingly, the prism sheet of the present invention contributes to slimming of the sheet, performance improvement, and reduction of manufacturing costs by reducing the number of the sheets applied to embody equal luminance, thereby reducing the number of LED lamps used for a backlight unit and saving energy.
Patent KR-20150145374-A (KR)
Inventor: KYOUNG SE UNG
IPC: H01L27/32
Filed: 2014-06-18
Abstract: Provided are an organic light-emitting display device in which foreign material adsorbed onto a surface of an upper substrate is minimized, and a method for manufacturing the same. The organic light-emitting display device according to an embodiment of the present invention comprises: a lower substrate; an organic light-emitting diode disposed on the lower substrate; an upper substrate disposed on the organic light-emitting diode to be opposite to the lower substrate; an an organic material layer which seals the organic light-emitting diode, and is disposed between the lower substrate and the upper substrate to make the lower substrate bonded to the upper substrate; and an antistatic layer which is formed on at least one of an upper surface and a lower surface of the upper substrate. According to the organic light-emitting display device of the present invention, through the antistatic layer, a foreign material which can be generated when the upper substrate is bonded to the lower substrate is minimized, so defective pixels is minimized.
Patent KR-20160001141-A (KR)
Inventor: JEONG KI BOCK
IPC: C11D13/00
Filed: 2014-06-26
Abstract: Disclosed are a soap having fermented lactobacillus and a method for producing the same. An effective microorganisms (EM) fermented liquid obtained by fermenting EM with refined water and having acidity of PH 3-4 is firstly mixed with a liquid soap base at a particular ratio, and is secondly mixed with an added functional fermented liquid (for example, aroma oil, green tea powder, apricot powder, coconut powder, Houttuynia cordata powder, medicinal herbs, lactobacillus, etc.), so a liquid mixture is obtained. The liquid mixture is added in a soap molding frame and dried for a particular period of time. Accordingly, drying time is reduced when a soap is produced. Toxicity may be sufficiently removed through neutralization of strong alkali. A soap having a whitening effect, a washing effect, a sterilizing effect, and a toxicity neutralizing effect may be produced.
Patent KR-20160004539-A (KR)
Title: Laundry treating machine
Inventor: JUNG JIN HWAN
IPC: D06F58/10
Filed: 2014-07-03
Abstract: The present invention relates to a clothes handling apparatus and, more specifically, to a clothes handling apparatus with enhanced portability by reducing the size of a clothes handling apparatus. According to an embodiment of the present invention, the clothes handling apparatus comprises: a body which is detachable from a supporting unit provided on the outside and supports clothes; an air intake unit which is provided in the body, and allows the outside air to flow into the body; a fan for introducing the outside air into the inside of the body through the air intake unit; a heater for heating the air introduced through the air intake unit; and an air exhaust unit which is provided in the body and discharges air passing through the heater to the outside of the body.
Patent KR-20160006071-A (KR)
Title: Steam iron manufacturing method and steam iron thereby
Inventor: JEONG JIN SUNG
IPC: D06F75/20
Filed: 2014-07-08
Abstract: The purpose of the present invention is to provide a method for manufacturing a steam iron and the steam iron manufactured thereby. The method for manufacturing a steam iron comprises the following steps of: accommodating molding sand in the cavity of a mold for molding a steam plate body (10); injecting a die-cast material between the molding sand and the cavity of the mold to mold the steam plate body (10) having a steam chamber secured by the molding sand; and forming a steam hole (16) connected to the steam chamber from the bottom surface of the steam plate body (10). The molding sand consists of first molding sand (112) and second molding sand (114); a first steam chamber (12) is formed in the steam plate body (10) by the first molding sand (112), and the steam hole (16) connected from the first steam chamber (12) to the bottom surface of the steam plate body (10) is formed; and a second steam chamber (14) is formed in the steam plate body (10) by the second molding sand (114), and a steam supply connection hole (18) connected from the second steam chamber (14) to the first steam chamber (12) is formed.
Patent KR-20160007206-A (KR)
Title: Laser continuously drilling apparatus improved loss rate of film
Inventor: LEE HYUNG KYU
IPC: B23K26/382
Filed: 2014-07-11
Abstract: The present invention relates to a laser drilling apparatus and, more specifically, relates to a non-stop laser drilling apparatus capable of reducing a region of loss of a film by continuously forming a through hole or a via hole on a desired position of a film type flexible printed circuit board using a laser, and changing a feeding position of the film at the same time. According to the present invention, the non-stop laser drilling apparatus with improved rate of loss of the film comprises: unwinding rollers in which a film is wound; a first film feeding supplying unit feeding the film while maintaining tension of the film unwound from the unwinding rollers; a pair of first equilibrium maintaining rollers loading the film while maintaining equilibrium of the film to accomplish the through hole or via hole processing in a first region by a first laser head while maintaining a tension from the first film feeding supplying unit; a pair of second equilibrium maintaining rollers spaced from the first equilibrium maintaining rollers by a predetermined distance, and loading the film while maintaining equilibrium of the film to accomplish the through hole or via hole processing in a second region by a second laser head; a varying device interposed between the first and second equilibrium maintaining rollers, and moving up and down by a motor while adhering the film to a lower side to change the position of the film; a second film feeding supplying unit located on a rear side of the second equilibrium maintaining rollers and feeding the film to be rewound in a winding roller while maintaining the tension; and the winding roller in which the film, on which the through hole or the via hole is formed, is rewound.
Patent KR-20160014126-A (KR)
Inventor: KIM YOUNG TAE
IPC: H04W4/00
Filed: 2014-07-28
Abstract: The present invention relates to a communication terminal, a control method thereof, and a recording medium for recording program for executing the control method. The control method of the communication terminal including a call application according to the present invention is characterized by comprising the following steps: sensing an event for sending a call; performing a call so that a first call menu corresponding to the call application is displayed on the uppermost layer and at the same time a first application that has been displayed on the uppermost layer at the point of generating the event for sending a call is converted into a background; and performing a control so that call is processed on the background and also the first application that has been converted into the background is displayed on the uppermost layer in case where a call is sent according to the operation of the first call menu, and so that a second call menu related to the call processing is displayed on any one of the separate areas that are distinguished between some areas of the display area of the first application and the display area of the first application. According to the present invention, during a state where a specific application is executed, in case where a user of the communication terminal makes a call to a specific party, the specific application is converted into background and then is converted into foreground again at the time of sending a call and is displayed on the screen. Thus, during a telephone conversation, the execution screen of the corresponding application is continuously displayed.
Patent KR-20160023218-A (KR)
Inventor: KIM YUNG CHAN
IPC: H01L27/146
Filed: 2014-08-21
Abstract: A unit pixel of an image sensor according to an embodiment of the present invention includes: a photodiode region including a photodiode which accumulates photocharges generated by an incident light during a first time; and a storage diode region including a storage diode which receives the photocharges accumulated in the photodiode and stores the photocharges. The photodiode corresponds to a microlens condensing the incident light, and the image sensor operates in a method of a global shutter. The present invention is to overcome shortcoming of the image sensor operated by the global shutter method.
Patent KR-20160025368-A (KR)
Inventor: RHO ILL HO
IPC: D21H21/36
Filed: 2014-08-27
Abstract: The present invention relates to a multi-functional paper having antimicrobial, insecticidal, anion-releasing effects, and a producing method thereof. In addition, the multi-functional paper is produced by injecting a chemical into an intermediate process which makes a paper using paper raw materials such as a pulp, a mixture mixed by the pulp and a recycled paper, or the recycled paper. The chemical can exhibit antimicrobial, insecticidal, anion-releasing effects.
Patent KR-20160026122-A (KR)
Title: Vacuum cleaner
Inventor: BOO MIN HYOUG
IPC: A47L9/00
Filed: 2014-08-29
Abstract: Disclosed is a vacuum cleaner. The vacuum cleaner comprises: a suction nozzle; a vacuum cleaning unit; and an expansion pipe assembly. The suction nozzle sucks garbage on a target surface to be cleaned. The vacuum cleaning unit separately collects the garbage introduced through the suction nozzle. The expansion pipe assembly has an upper end part connected to the vacuum cleaning unit to be communicated therewith and a lower end connected to the suction nozzle to be communicated therewith. The expansion pipe assembly can be set in a standing state in such a manner where the extension pipe assembly is slanted toward the front side of the suction nozzle at a preset angle based on an axis vertical to the target surface to allow the center of gravity to be moved downward. According to the present invention, a user maintains the vacuum cleaner in the standing state through a very simple operation when completing or temporarily stopping a cleaning work and converts the standing state into a released state when restarting the cleaning work.
Patent KR-20160028194-A (KR)
Inventor: LEE SEUNG HO
IPC: H04N5/44
Filed: 2014-09-03
Abstract: The present invention relates to a displayport (DP) sink, and a method for providing data. According to the present invention, the DP sink recognizes the length of data remaining in a data buffer by using a dual port data buffer, controls a pixel clock to be slow when the length of the data is formed to be longer than a reference value, and controls the pixel clock to be fast when the length of the data is formed to be shorter than the reference value.
Patent KR-20160028730-A (KR)
Inventor: KIM HYUK SU
IPC: H01M10/04
Filed: 2014-09-04
Abstract: A method for manufacturing an electrode assembly of the present invention includes: a fist step of manufacturing a first kind of a basic unit body having a structure formed by alternately stacking the same number of electrodes and separation films; and a second step of manufacturing a unit body stack unit by repeatedly stacking the first kind of the basic unit bodies. An end portion of the separation film is not attached to an end portion of an adjacent separation film. The first kind of the basic unit body has a four-layered structure, formed by sequentially stacking a first electrode, a first separation film, a second electrode, and a second separation film, or a structure formed by stacking the four-layered structures. In the first step, the surface of at least one from the electrode and the separation film is treated with plasma. The present invention is to provide a method for manufacturing the electrode assembly which makes precise alignment and a simple process possible.
Patent KR-20160028854-A (KR)
Inventor: CHO YEON CHEOL
IPC: F04D29/40
Filed: 2014-09-04
Abstract: The present invention relates to a centrifugal pump, and more specifically, to a centrifugal pump which can prevent an irregular flow of an impeller caused by the pressure of a fluid in a circulation pump inner space by forming a flow path capable of inducing flow of the fluid at a rotation support axis installed to rotatably support the impeller during rotation of the impeller; can improve operation efficiency of a driving part by minimizing rotation resistance of the impeller caused by a lubrication action by forming a water screen along an edge part of the rotation support axis; and can prevent noise and vibration caused by rotation of the impeller. The centrifugal pump according to the present invention includes: an impeller housing where an absorption hole for absorbing the fluid and an outlet for discharging the fluid are formed, and an upper axis support part is formed at the internal center; a main body housing which comprises an impeller accommodation part having a lower axis support part corresponding to the upper axis support part therein, and is combined to a lower part of the impeller housing; the rotation support axis which is connected to the upper axis support part and the lower axis support part vertically; the impeller which has an axis hole vertically penetrated to be supported by being inserted to the rotation support axis, and is accommodated in the impeller accommodation part for the outer circumference to form a fixed gap to an inner plane of the impeller accommodation part; and a driving part for driving the impeller rotationally. The rotation support axis has a flow passage to discharge the fluid flowing into a lower space of the impeller through the gap to an upper space of the impeller when the impeller is rotated.