A slip ring system for an electrical machine, comprising: slip rings, which are arranged so as to rotate about an axis of rotation, for transmitting current to the electrical machine; contact brushes which are in contact with the slip rings; an impeller which is mountable so as to surround the axis of rotation and in a rotationally fixed manner in relation to the slip rings, the impeller being adapted to generate an air flow in a plane perpendicular to the shaft; and a filter which surrounds the impeller such that an imaginary radial extension of the impeller meets the filter, and a porosity of the filter decreases in a radially outward direction between a radially inner edge of the filter and a radially outer edge of the filter; wherein a first thickness of the filter in a radial direction is at least 50% of a second thickness of the filter in an axial direction.

A cooling air filter for an electric motor, includes a filter with a planar shape and minimum dimension so as to cover the area of the slits of a covering casing of a fan for an electric motor for which it is intended; and the filter is housed in a support which is fixed in a steady and removable way on the surface of the casing; the support having a frame-like structure from which at least two arms extend, which are diametrically opposite in the frame-like structure, and which are provided at their end with fixing and gripping means of the arms on the casing itself; the fixing means being configured for the fast detachment from and hooking onto said casing.

A filtering detection device mainly comprises a filter, a fan and a detector. The filter is disposed on a machine housing of an electronic device, the fan is disposed at a position corresponding to the filter inside the machine, and the detector is disposed between the fan and the filter. The present invention uses the detector to detect the air flow velocity or flow rate of outside air entering the machine through the filter when the outside air is pumped into the machine through the filter. The detector determines whether the filter is clogged or not by detecting if the air flow rate or flow rate detected by the detector is reduced, then an alarm device electrically connected with the detector can be used to notify a user to replace the filter.

A system for removing particulate matter from the gas in a gas discharge laser includes one or more nonwoven screens which are optimized for, among others, manufacturability and feature integration. The nonwoven screens are configured for precisely directing the flow to optimize the separation of particles from the gas flow and provide sufficient surface area for improved dust adherence.

An electronic apparatus includes a housing, a first filter, and a second filter. The housing includes a first intake port. The first filter is disposed on an outer side of the housing and covers the first intake port. The second filter includes a first part coarser than the first filter and covers the first filter from a side opposite to the first intake port.

An extreme ultraviolet radiation source is provided, including a vessel and a gas scrubber. The vessel has a gas inlet from which a cleaning gas is supplied into the vessel and a gas outlet from which the cleaning gas exits the vessel. 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 sizes of the gas passages vary according to the distance between each of the gas passages and the gas outlet.

The present technology is generally related to a filter assembly. The filter assembly has a first layer has a base layer defining a first perimeter region and a region central to the first perimeter region. A first adhesive is disposed on a first surface of the first layer substantially within the central region, and first adsorbent beads are coupled to the first adhesive. A second layer has a first sheet of filter material having a second perimeter region, wherein the first perimeter region and the second perimeter region are bonded. A third layer has a second sheet of filter material having a third perimeter region, wherein the first perimeter region and the third perimeter region are bonded. The base layer, second layer, and third layer are substantially coextensive.

An additional cover provides a cabinet with protection from fluidic ingress. The additional cover includes first and second portions having first and second main sections, respectively, and first and second flanges, respectively, and first and second sidewalls extending between corresponding sidelong edges of at least the first and second main sections. The first and second portions and the first and second sidewalls are arranged to define a flow passage with an inlet at an upper end thereof and an outlet at a lower end thereof. The first and second flanges are provided at the inlet and outlet, respectively, to prevent fluid flow through the flow passage.

In one embodiment, an apparatus includes a frame for mounting in a rack in a position adjacent and external to a network device supported by the rack and a filter module for holding a filter for filtering air entering an air inlet of the network device. The frame includes an opening for receiving the filter module and positions the filter adjacent to the air inlet of the network device when installed on the rack.

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.