A dust removing device for a long bag filter having a large diameter employs a method of injecting amplified air through a dual injector having two injectors vertically arranged on the same axis to exhibit a stronger dust removing force than a conventional bag filter dust removing device, and is thus applicable to a bag filter having relatively a large diameter and a long length.

An ambient air purification device for a road vehicle for removing dust, particulate matter, and/or gases from ambient air has one or more filter elements. The ambient air purification device is attachable in an external region to a vehicle rear of the road vehicle by a releasable coupling. The ambient air purification device has at least one mating coupling of the releasable coupling, wherein the at least one mating coupling is coupled to a vehicle-side coupling component of the releasable coupling. A road vehicle provided with such an ambient air purification device is provided.

An environmental air cleaning device for a road vehicle removes dust, particulate matter, and/or gases from environmental air. The environmental air cleaning device has one or more filter elements. The environmental air cleaning device is provided with a mounting device that rigidly couples to a vehicle-side mounting device for roof loads. A road vehicle with such an environmental air cleaning device is provided.

A bag filter filtration and dust collecting apparatus according to the present invention is a bag filter filtration and dust collecting apparatus using a bag filter for collecting dust and the like from supplied polluted air and then discharging the dust and the like to the outside, and the bag filter filtration and dust collecting apparatus comprises: an upper case in which a plurality of bag filters for filtering dust are installed in the vertical direction; a lower case, formed at a lower end of the upper case, which collects dust that falls from the bag filter; and at least two mutually parallel air supply pipes, passing through the lower case, which supply polluted air into the bag filter filtration and dust collecting apparatus, wherein the air supply pipe is provided with a side discharge hole formed on the side thereof whereby the air spray is directed toward the inner side wall of the upper case or the lower case, and accordingly, a central space between the at least two air supply pipes forms a region in which dust can fall.

A pocket filter assembly (1) with reduced risk for exposing a user to contaminations leaving the pocket filter assembly during and after removal of the pocket filter assembly from an installation is disclosed. A first pocket filter (6a) comprises a grip member (10) configured to be gripped by the user to enable folding of the pocket filters in a controlled manner before removal of the pocket filter assembly from an installation.

Filter media including a waved filtration layer are described herein. The filtration layer may be held in a waved configuration by a support layer. In some cases, the filtration layer may have a combination of characteristics (e.g., mean flow pore size, basis weight, amongst others) that can lead to enhanced filtration performance (e.g., reduced air permeability decrease), in particular, in high humidity environments. The filter media may be used to form a variety of filter elements for use in various applications.

Filter media incorporating one or more filtration layers that include fibers including fiber portions orientated at a non-zero angle with respect to a surface of the filtration layer are provided. In some embodiments, at least a part of the fiber portions are positioned at an angle of at least 20 degrees (e.g., between 46 degrees and 90 degrees, or between 61 degrees and 90 degrees) with respect to a surface of the filtration layer or an outer or cover layer of the media. This orientation of fiber portions may result in an increased efficiency (e.g., average efficiency and/or initial efficiency) compared to similar filter media that do not include such oriented fiber portions.

A filter unit for use With a filtrating fluid flow system is configured to receive a flow of a fluid containing particulate matter. The filter unit comprises a filter structure formed of a filter material configured to at least partially filter the particulate matter from the flow of fluid. The filter unit further comprises an entry plate located proximate the filter structure entrance. The filter structure and the entry plate together define a fluid cavity within the filter unit, the entry plate having at least one orifice defined therein through which the flow of fluid can pass into the fluid cavity. The orifice is configured to form a choke, creating a Venturi effect for temporarily increasing the velocity of the flow of fluid through the entry plate and within the fluid cavity, and onto the filter material.

A method of producing an air filter includes a first step of preparing a tow band and a second step of obtaining a filter medium layer that includes first fibers obtained by applying tension to the tow band to spread the tow band and the first fibers having an average fiber diameter of 5 ?m or more and 50 ?m or less and second fibers disposed in gaps between the first fibers and having an average fiber diameter of 30 nm or more and 1 ?m or less. The second fibers are drawn out from the particulate resin by drawing the particulate resin, and the particulate resin is drawn by separating the first fibers from each other so that a gap is formed between the first fibers during the spreading of the tow band.

In a filtration system, in particular for cleaning the intake air of a gas turbine, including a flow channel surrounded by walls with an inflow opening and an outflow opening, a partition wall with at least two openings between a dirty side and a clean side which is positioned between the inflow opening and the outflow opening and limited by the walls of the flow channel, and at least two filters for purifying a flowing fluid. At least one filter is installed at a first opening on the dirty side of the partition wall and at least one filter at a second opening on the clean side of the partition wall.