Abstract: Disclosed is a vacuum cleaner that opens or closes a hole formed in a suction portion according to a state of a surface to be cleaned, thereby efficiently cleaning. A vacuum cleaner includes a suction portion configured to suck foreign materials on a surface to be cleaned. The suction portion includes a case having an air hole formed in a flow path, a frame configured to be accommodated in the case and open or close the air hole, and a button configured to be mounted on the case and be operated to move the frame.

Abstract: Disclosed is a vacuum cleaner that opens or closes a hole formed in a suction portion according to a state of a surface to be cleaned, thereby efficiently cleaning. A vacuum cleaner includes a suction portion configured to suck foreign materials on a surface to be cleaned. The suction portion includes a case having an air hole formed in a flow path, a frame configured to be accommodated in the case and open or close the air hole, and a button configured to be mounted on the case and be operated to move the frame.

Abstract: A vacuum cleaner includes a main body including a fan motor to generate suction force, a suction unit connected to the main body to suction foreign matter from a surface to be cleaned in a state of contacting the surface, a dust collector separatably mounted to the main body to separate and collect dust from air suctioned by the suction unit, and a wheel assembly to move the main body, wherein the wheel assembly includes frames provided at a lower part and left and right sides of the main body and wheels rotatably mounted to the frames provided at the left and right sides of the main body, each wheel having a negative camber angle.

Abstract: A cyclone dust collector includes a cyclone chamber to centrifugally separate dust by creating rotating airflow, and a ring-shaped indicator provided to the cyclone chamber to rotate due to the rotating airflow in the cyclone chamber. The indicator visualizes the rotating airflow by rotating when the rotating airflow is created. The user may easily check condition of the rotation airflow and take proper action in the case that the cleaner malfunctions.

Abstract: A vacuum cleaner includes a main body including a fan motor to generate suction force, a suction unit connected to the main body to suction foreign matter from a surface to be cleaned in a state of contacting the surface, a dust collector separatably mounted to the main body to separate and collect dust from air suctioned by the suction unit, and a wheel assembly to move the main body, wherein the wheel assembly includes frames provided at a lower part and left and right sides of the main body and wheels rotatably mounted to the frames provided at the left and right sides of the main body, each wheel having a negative camber angle.

Abstract: A vacuum cleaner includes a main body including a fan motor to generate suction force, a suction unit connected to the main body to suction foreign matter from a surface to be cleaned in a state of contacting the surface, a dust collector separatably mounted to the main body to separate and collect dust from air suctioned by the suction unit, and a wheel assembly to move the main body, wherein the wheel assembly includes frames provided at a lower part and left and right sides of the main body and wheels rotatably mounted to the frames provided at the left and right sides of the main body, each wheel having a negative camber angle.

Abstract: A suction nozzle for use in a vacuum cleaner includes a suction opening through which air is drawn in from a surface to be cleaned, a sterilization chamber having at least one inlet and at least one outlet, the sterilization chamber being in fluid communication with the suction opening through the at least one inlet, and a sterilization unit disposed in the sterilization chamber to sterilize the air drawn into the sterilization chamber. The air drawn into the sterilization chamber revolves while moving from the at least one inlet to the at least one outlet.

Abstract: A wet-type dust collector for a vacuum cleaner. The disclosed wet-type dust collector includes a first separating portion, the inside of which is filled with water for separating dust from air that is suctioned in from the outside; an exhaust pipe unit having an exhaust outlet and installed inside the first separating portion; and a passage-closing unit installed inside the exhaust pipe unit, wherein the passage-closing unit closes the exhaust outlet of the exhaust pipe unit by means of the combined forces of the suctioning force through the exhaust pipe unit and the buoyant force of the water, in order to prevent the water from leaking out from the first separating portion.

Abstract: A cyclone dust collecting apparatus for a vacuum cleaner includes a first chamber; an entering passage disposed above the first chamber, the entering passage guiding outer air to form a downwardly whirling air current in the first chamber; a second chamber formed at a position higher than that of an outlet of the entering passage above the first chamber, the second chamber in which the outer air entering from the first chamber whirls; a contaminants-blocking member disposed to be spaced apart from a bottom surface of the first chamber at a center of the first chamber, the contaminants-blocking member preventing contaminants and water separated in the first chamber from moving into the second chamber; and a grill disposed inside the second chamber to be in fluid communication with an air discharging port through which clean air is discharged.

Abstract: A cyclone dust collector includes a cyclone chamber to centrifugally separate dust by creating rotating airflow, and a ring-shaped indicator provided to the cyclone chamber to rotate due to the rotating airflow in the cyclone chamber. The indicator visualizes the rotating airflow by rotating when the rotating airflow is created. The user may easily check condition of the rotation airflow and take proper action in the case that the cleaner malfunctions.

Abstract: A vacuum cleaner includes a main body including a fan motor to generate suction force, a suction unit connected to the main body to suction foreign matter from a surface to be cleaned in a state of contacting the surface, a dust collector separatably mounted to the main body to separate and collect dust from air suctioned by the suction unit, and a wheel assembly to move the main body, wherein the wheel assembly includes frames provided at a lower part and left and right sides of the main body and wheels rotatably mounted to the frames provided at the left and right sides of the main body, each wheel having a negative camber angle.

Abstract: A wet type dust collecting apparatus of a vacuum cleaner is provided. The wet type dust collecting apparatus of a vacuum cleaner includes a first separating unit configured to filter out and discharge dust by rotating air which is inlet via a first air inlet, and a plurality of a second centrifugal separating units configured to filter out dust from the air which is discharged from the first separating unit, and configured to eliminate dust from the inlet air via water which is filled inside of the second centrifugal separating units.

Abstract: Disclosed is a dust collector provided with a dust-removing unit. The disclosed dust collector comprises: a first centrifugal separating tube defining a first centrifugal area for separating dust from air suctioned in through a first inlet; a first dust box for collecting dust separated in the first centrifugal area; a first detaching portion having a first exhaust pipe unit for exhausting the air from the first centrifugal separating tube and the first dust box to the outside; and a handle unit for maintaining the first centrifugal separating tube and the first dust box coupled together, or for releasing the coupling thereof.

Abstract: Disclosed is an active sonar system capable of estimating a direction and a range of a target by using a sound pulse. A target range error can be estimated by the active sonar system, by applying a principle that a sound pulse used to detect an underwater target with consideration of a vertical structure of a sound velocity in water is reflected and refracted through a multipath not a linear path.

Abstract: A water filtering device equipped with a water level adjustment unit is provided. The water filtering device includes an external air inlet through which dust-containing air flows in, a dust separator communicating with the external air inlet and separating dust in the inflow air, exhaust outlets communicating with the dust separator and discharging the air from which the dust has been separated, a dust container communicating with the dust separator and being filled with water, and a water level adjustment unit installed in the dust container to adjust the level of the water in the dust container. The water level adjustment unit includes a supercharged water drainage tube installed on a bottom of the dust container, and a manual opening/closing device for adjusting the level of the water through the supercharged water drainage tube.

Abstract: A drum type vacuum cleaner includes a centrifugal separator to separate dust from air using centrifugal force, a dust tank having an open top through which the centrifugal separator is mounted in the dust tank, the dust tank being provided with a dust collector to store the separated dust, and a cover unit having a motor to generate suction force, the cover unit being mounted to cover the top of the dust tank, wherein the centrifugal separator is disposed so that a central axis of rotary force of the centrifugal separator to whirl air is at a right angle to a central axis of the motor, whereby dust contained in suctioned air is discharged to the dust collector, and air from which dust has been separated is discharged to the outside by the motor provided at the cover unit.

Abstract: A wet-type dust collector for a vacuum cleaner. The disclosed wet-type dust collector includes a first separating portion, the inside of which is filled with water for separating dust from air that is suctioned in from the outside; an exhaust pipe unit having an exhaust outlet and installed inside the first separating portion; and a passage-closing unit installed inside the exhaust pipe unit, wherein the passage-closing unit closes the exhaust outlet of the exhaust pipe unit by means of the combined forces of the suctioning force through the exhaust pipe unit and the buoyant force of the water, in order to prevent the water from leaking out from the first separating portion.

Abstract: A vacuum cleaner having a suction path switching unit is provided that includes a cleaner body having a body frame; a suction inlet body hinged to the body frame; an extension pipe assembly having a hose and an extension pipe connected in fluid communication with the hose; and a suction path switching unit disposed on the body frame. The suction path switching unit has a switching duct, at least a portion of which is elastically arranged on a suction path to be displaceable on the suction path. As the extension pipe is fixed on or separated from the body frame, the switching duct is selectively displaced to a first position of opening a first suction path flowing from the suction inlet body to the dust collecting unit or a second position of opening a second suction path flowing from the extension pipe to the dust collecting unit.

Abstract: Disclosed is a dust collector provided with a dust-removing unit. The disclosed dust collector comprises: a first centrifugal separating tube defining a first centrifugal area for separating dust from air suctioned in through a first inlet; a first dust box for collecting dust separated in the first centrifugal area; a first detaching portion having a first exhaust pipe unit for exhausting the air from the first centrifugal separating tube and the first dust box to the outside; and a handle unit for maintaining the first centrifugal separating tube and the first dust box coupled together, or for releasing the coupling thereof.

Abstract: A wet type dust collecting apparatus of a vacuum cleaner is provided. The wet type dust collecting apparatus of a vacuum cleaner includes a first separating unit configured to filter out and discharge dust by rotating air which is inlet via a first air inlet, and a plurality of a second centrifugal separating units configured to filter out dust from the air which is discharged from the first separating unit, and configured to eliminate dust from the inlet air via water which is filled inside of the second centrifugal separating units.