A respiratory droplet suction device includes an air inlet end and an exhaust end. A plurality of filtering devices are arranged between the air inlet end and the exhaust end. The filtering device is provided with a bacteria filtering screen for adsorbing bacteria and an ultraviolet sterilization lamp for inactivating the bacteria. The filtering device includes a first side wall and a second side wall. The first side wall is connected to the air inlet end, and the second side wall is connected to the exhaust end. The air entering from the first side wall is filtered by the bacteria filtering screen and discharged through the second side wall. The ultraviolet sterilization lamp is arranged corresponding to the bacteria filtering screen. A respiratory droplet filtering apparatus includes the respiratory droplet suction device, and a respiratory droplet electric suction system includes the respiratory droplet filtering apparatus are further provided.

A filter for a vent opening of a container comprises a filter element and a flange which surrounds the filter element. The filter element and the flange are integrated by means of an injection molding process, in which material is injected against a solid filter element in a mold, from which material the flange arises after curing. The filter element has an edge portion which extends in its circumferential direction. The edge portion has a front side, a back side and a side edge extending between the front side and the back side. The back side is covered the flange and the side edge in circumferential direction of the edge portion is alternatingly entirely and partly covered from the back side by the material of the flange. At the locations where the side edge is entirely covered the front side is also covered by the material of the flange.

An air filter including a base and a first and second frame element is disclosed. Each frame element is coupled to the base. The frame elements have an oscillating shape having a first portion relatively close to the base and a second portion relatively farther from the base. A filter element generally follows the oscillating shape of the frame elements. An air filter system is also disclosed. The air filter system can include the air filter and an air filter container. The air filter container contains the air filter and directs air through the air filter in a predetermined direction. An air filter is disclosed including a support structure and an oscillating shaped filter element attached to the support structure. The oscillating shape increases the air filter surface area for a given volume.

Proposed is a super-absorbent filter capable of rapidly and economically removing moisture in a lubricant. More particularly, the super-absorbent filter includes: a filter body formed in a cylindrical shape by using a super-absorbent material so as to adsorb and remove free moisture in oil; and a particle filter capable of capturing contaminated particles in oil by using an internal particle filter and an external particle filter that are respectively added and sewed to an internal portion and an external portion of the filter body formed in the cylindrical shape. By using the super-absorbent filter proposed in the present disclosure, preventing of loosening of the filter body that may be caused by moisture adsorption of the super-absorbent material and blocking contaminated particles in oil by assisting a core filter installed inside the super-absorbent filter are possible.

A filter element has a filter medium body and sealing material strips extending at least partially circumferentially in a circumferential direction of the filter medium body at an inflow side of the filter medium body and at least at one additional side of the filter medium body. A first one of the sealing material strips carries at least one holding tab. The at least one holding tab projects past the first sealing material strip. The at least one holding tab is embodied at least partially of a material of the first sealing material strip. A filter device with such a filter element arranged in a filter housing is provided.

A respiratory droplet suction device includes an air inlet end and an exhaust end. A plurality of filtering devices are arranged between the air inlet end and the exhaust end. The filtering device is provided with a bacteria filtering screen for adsorbing bacteria and an ultraviolet sterilization lamp for inactivating the bacteria. The filtering device includes a first side wall and a second side wall. The first side wall is connected to the air inlet end, and the second side wall is connected to the exhaust end. The air entering from the first side wall is filtered by the bacteria filtering screen and discharged through the second side wall. The ultraviolet sterilization lamp is arranged corresponding to the bacteria filtering screen. A respiratory droplet filtering apparatus includes the respiratory droplet suction device, and a respiratory droplet electric suction system includes the respiratory droplet filtering apparatus are further provided.

There is a need to reduce the amount of overlapping parts of a nonwoven fabric of a filter component to thereby lengthen the life of the filter component. This need is met by the filter component formed of a cylindrical nonwoven fabric having a center axis, and having a plurality of polygon-shaped cross-sections which are a same shape that are formed side-by-side at predetermined intervals along the center axis. Each side of each of the polygons is formed by a mountain fold part on a plane perpendicular to the center axis, and each vertex of one polygon is connected by a mountain fold part to each vertex of another polygon, respectively.

A filter for a vent opening of a container comprises a filter element and a flange which surrounds the filter element. The filter element and the flange are integrated by means of an injection molding process, in which material is injected against a solid filter element in a mold, from which material the flange arises after curing. The filter element has an edge portion which extends in its circumferential direction. The edge portion has a front side, a back side and a side edge extending between the front side and the back side. The back side is covered the flange and the side edge in circumferential direction of the edge portion is alternatingly entirely and partly covered from the back side by the material of the flange. At the locations where the side edge is entirely covered the front side is also covered by the material of the flange.

Filtration media, media packs, and filtration elements are described, including fluted filtration media having offset flutes arranged to intermittently contact flutes on adjacent media, including angled and curved flutes. Pleated filtration media with alternating sealed pleat edges are also disclosed, including fluted media with alternating sealed flutes. A media pack can have a first sheet of media and a second sheet of media. The first sheet of media can have a first plurality flutes defining first flute valleys extending between a first face and a second face of the media pack. The second sheet of media can have a second plurality of flutes defining second flute peaks extending between the first face and the second face of the media pack. The first plurality of flutes can be non-parallel to the second plurality of flutes, and each first flute valley contacts one second flute peak at a discrete contact point.

A restaurant exhaust gas purifying system for filtering an exhaust gas of a cooking process including an exhaust vent and an exhaust gas purifier coupled to the exhaust vent. The exhaust gas purifier includes a housing which has an inlet connected to the exhaust vent and an outlet, a hot box connected to and housed within the housing, a heating device connected to the housing and configured for heating the hot box, and a rotating filter rotatably mounted to and housed within the housing. The rotating filter has a rotational cycle in which at least a portion of the rotating filter passes through the hot box. The exhaust gas purifier also includes a drive connected to the housing and operably coupled to the rotating filter for rotating the rotating filter, and a stationary filter positioned in the hot box.