The present disclosure relates to a tumble dryer (1) with a filter arrangement (12) located in a tumble dryer process air flow (21) for removing lint from process air leaving tumble dryer drum. The filter arrangement comprises a first coarse-mesh filter (25) and a second fine filter (27). A first sensor (41) detects a correct positioning of the first filter in the tumble dryer, and a second sensor (33) detects a pressure drop over a process air flow path comprising the second filter. A control arrangement (45) is configured to initiate a disabling operation which disables the fan arrangement (12), if the first filter is not correctly positioned in the tumble dryer or if the pressure drop over the second filter exceeds a predetermined threshold value.

The present invention provides an air purifier. The air purifier according to one preferred embodiment, of the present invention may comprise: a housing; a blowing unit installed in the housing so as to draw in external air; and a filter unit having filtering surfaces, through which the air passes and which are disposed in multiple directions, and an air inflow space, which has at least a part thereof surrounded by the filtering surfaces disposed in the multiple directions and into which the air discharged from, the blowing unit flows.

An air cleaner assembly is disclosed. In one aspect, the air cleaner assembly includes a housing defining an inlet and an outlet, and including an access opening between the inlet and outlet. The air cleaner also includes a filter cartridge received within the housing and covering the access opening. The air cleaner also includes a lock mechanism. The lock mechanism is movable between an unlocked position in which the filter cartridge can be installed and removed from the housing and a locked position in which the filter cartridge is secured within the housing. The filter cartridge and lock mechanism include interacting features allowing the lock mechanism to be moved from the unlocked position to the locked position only when the filter cartridge is installed within the housing.

The present invention provides an air purifier. The air purifier according to one preferred embodiment, of the present invention may comprise: a housing; a blowing unit installed in the housing so as to draw in external air; and a filter unit having filtering surfaces, through which the air passes and which are disposed in multiple directions, and an air inflow space, which has at least a part thereof surrounded by the filtering surfaces disposed in the multiple directions and into which the air discharged from, the blowing unit flows.

A round filter element has a filter medium body flowed through by a fluid to be purified in radial direction relative to a longitudinal axis of the filter medium body. The filter medium body radially encloses an inwardly positioned flow space. An end disk is arranged at an end face of the filter medium body. The end disk has a shaped body axially delimiting the inwardly positioned flow space. The end disk has a sealing disk arranged externally at the shaped body, wherein the sealing disk covers the shaped body and the end face of the filter medium body. The shaped body has a receiving depression that is flow-tight relative to the inwardly positioned flow space. The sealing disk has a receiving opening aligned with the receiving depression of the shaped body. The receiving depression and the receiving opening can receive a support element of a filter housing.

This present description discloses a combined air filter element filtering device, where the first filter element and second filter elements have a cube or cuboid shape. The second filter element and the first filter element are oriented in sagittal symmetry. The third filter element and the fourth filter element are oriented in symmetric distribution at the two sides of the first filter and second filter elements. The third filter element and the fourth filter element are in a semicircular or semi-arc ring structure. The first filter element, second filter element, third filter element and fourth filter element, when assembled into the combined air filter element device form a kidney-shaped or an oval three-dimensional ring-shaped combined air filter element filtering device. First, second, third and fourth filter elements are arranged to allow axial passage of air through the filter elements with decreased resistance and improved volume in order to reduce the air intake resistance in the filter element and increase the filter area so as to provide a combined air filter element filtering device of the same dimensions as conventional filters yet having a higher air inlet volume and improved clogging capacity, higher filtering efficiency and service life.

There is disclosed an air-oil separator for a gas turbine engine. The separator has a first separator section having a first separator rotatably mounted about a rotation axis and having an air-oil mixture inlet and an air-oil mixture outlet; a second separator section having a second separator rotatable about the rotation axis, the second separator having a first air-oil mixture inlet fluidly connected to the air-oil mixture outlet of the first separator, and a second air-oil mixture inlet; and an air outlet. A first flow path extends from the first air-oil mixture inlet to the air outlet through the two separator sections, and a second flow path extends from the second air-oil mixture inlet to the air outlet, solely through the second separator section A method of operating an air-oil separator is also disclosed.

An exhaust gas filter for a reflow oven is disclosed, which comprises a filter chamber, a filtering piece and a vapor chamber. An upper transverse passage is formed between the vapor chamber top plate and the filter element, a gap is formed between one side of the top plate and the sidewall of a filter chamber, and the upper transverse passage is in fluid communication with the gap; one filter chamber sidewall forming a gap with the top plate is disposed with a filter chamber air inlet for introducing air, and one of the other three sidewalls of the filter chamber is disposed with an exhaust gas inlet for introducing exhaust gas from the exhaust gas filter chamber, so that the air and the exhaust gas can enter the upper transverse passage through the gap. A vapor chamber is disposed to sufficiently mix the exhaust gas and the air, thus lowering the exhaust gas temperature below the freezing point of the rosin, and better removing the flux contaminant in the exhaust gas. Meanwhile, a slide-fitted outer casing and a filter chamber are provided, which makes it easier to disassemble and clean the filter chamber.

A filter has a filter center tube that includes a plurality of layers of solidified material including a first layer with a first undulating strip of solidified material extending in a first predetermined direction, and a second layer with a second undulating strip of solidified material extending in a second predetermined direction. The first layer is in contact with the second layer and the first predetermined direction is not parallel with the second predetermined direction, forming a plurality of pores therebetween.

An air filtration system is provided. The air filtration system embodies filtration material supported by a frame, wherein the air filtration system provides two framed filtration materials sandwiching a fabric filter. Such framework may be removably engaged through magnetic forces. The filtration material may hold and/or carry electrostatic forces and/or magnetostatic forces induced through a current from an electrical power source and/or magnetic forces of the magnetics.