An extreme ultraviolet radiation source is provided, including a vessel, an optical collector, and a gas scrubber. The vessel has a gas inlet and a gas outlet. The optical collector is disposed within the vessel and configured to collect and reflect extreme ultraviolet light produced in the vessel. A cleaning gas is introduced into the vessel through the gas inlet to clean the surface of the optical collector. The gas scrubber is disposed within the vessel, arranged such that the cleaning gas leaves the vessel through the gas outlet after flowing through the gas scrubber. The gas scrubber has a number of gas passages to allow the cleaning gas to flow through, and the size of the gas passage close to the gas outlet is smaller than the size of the gas passage away from the gas outlet.

A fluid separator for a compressed air system including a head cap defining an inlet port and an outlet port, a first body defining an inner air shaft extending from an upper end to an opposing lower end, the upper end in fluid communication with the inlet port, and a vortex baffle disposed about the lower end of the inner air shaft. A second body forms an outer air shaft about the inner air shaft and vortex baffle, the outer air shaft extending from a lower end proximate to the vortex baffle to an upper end in fluid communication with the outlet port.

A dirt separator for a vacuum cleaner including a chamber having an inlet through which dirt-laden fluid enters the chamber and an outlet through which cleansed fluid exits the chamber; and a disc located at the outlet, the disc being arranged to rotate about a rotational axis and including holes through which the cleansed fluid passes. When viewed normal to the disc, each hole is elongate and defines a longitudinal axis which runs within the plane of the disc. The longitudinal axis of each hole is inclined relative to the radial direction of the disc.

A dirt separator for a vacuum cleaner including a chamber having an inlet through which dirt-laden fluid enters the chamber and an outlet through which cleansed fluid exits the chamber; and a disc located at the outlet, the disc being arranged to rotate about a rotational axis and including holes through which the cleansed fluid passes. When viewed normal to the disc, each hole is elongate and defines a longitudinal axis which runs within the plane of the disc. The longitudinal axis of each hole is curved.

A dirt separator including a chamber having an inlet through which dirt-laden fluid enters the chamber and an outlet through which cleansed fluid exits the chamber, and a disc located at the outlet, the disc being arranged to rotate about a rotational axis and including holes through which the cleansed fluid passes. The holes are distributed over at least first and second regions of the disc, the second region being radially outward of the first region. The porosity of the second region is higher than the porosity of the first region.

A dirt separator for a vacuum cleaner including a chamber having an inlet through which dirt-laden fluid enters the chamber and an outlet through which cleansed fluid exits the chamber; and a disc located at the outlet, the disc being arranged to rotate in a predetermined direction about a rotational axis, and including holes running from an upstream face to a downstream face through which the cleansed fluid passes. When viewed along the radial direction of the disc, the path of each hole through the thickness of the disc defines a centreline, the centreline being inclined such that it is non-perpendicular to the disc. The centreline of each hole is inclined such that it intersects the upstream face of the disc at a point which is behind, in the direction of rotation of the disc, the point at which the centreline intersects the downstream face of the disc.

A cleaner includes: a main body that receives a suction motor; and a filter unit that is detachably coupled to the main body to filter air discharged from the suction motor and includes a ring-shaped filter and a filter frame that receives the ring-shaped filter, wherein the filter frame includes: an inner frame; an outer frame that defines a filter space for receiving the filter in cooperation with the inner frame; and a ring-shaped filter cover that connects the outer frame and the inner frame to each other and has one or more air openings.

Provided is a linear compressor. The linear compressor includes a cylinder disposed in a shell to define a compression space for a refrigerant, a piston installed to reciprocate in the cylinder, a motor assembly that allows the piston to move in an axial direction of the cylinder and thereby to compress the refrigerant introduced into the compression space, a nozzle which is provided in the cylinder and through which a portion of the refrigerant introduced into the compression space passes, and a cylinder filter installed in the cylinder and disposed at an inlet-side of the nozzle. At least one or more surfaces of the cylinder filter are oil-repellent coated.

Systems and methods for customizing a removable filter in an air purifier. The removable filter may comprise multiple filter types, and the combination and characteristics of the filter types can be varied based on air-quality requirements. In some instances, the composition of a new filter can be determined based on data obtained from analysis of used filters. Additionally, filters can be personalized based on an individual user's health data, geographic location, and regional and local air-quality characteristics.

According to one aspect of the present disclosure, because there is no need for a user to pick dust or the like adhered to an outer circumferential surface of the grill off by hand, the vacuum cleaner is easy to use. In addition, when removing dust or the like adhered to an outer circumferential surface of the grill, generation of secondary contamination around the case can be prevented. A cyclone dust collector, the cyclone dust collector comprises a case configured to accommodate dust separated from suctioned air, a first cover configured to open, and close a bottom of the case and a grill assembly provided to be detachable from the case.