Abstract: Apparatus and methods for separating a fluid, with the apparatus including an inner drum wall disposed around and coupled to a shaft. The apparatus also includes an outer drum wall disposed around the inner drum wall, the outer drum wall being configured to rotate to separate a higher-density component of the fluid from a lower-density component of the fluid. The apparatus further includes a first radial vane disposed between the inner drum wall and the outer drum wall and having first contours configured to turn the fluid in at least one of a radially-inward direction and a radially-outward direction. The apparatus also includes a housing at least partially surrounding the outer drum wall and configured to receive the high-density component of the fluid therefrom.

Abstract: An air cleaner device for filtering intake air including a housing defining a chamber, a filter element disposed within the chamber, and a duct element having a passageway in fluid communication with the chamber. Further, the duct element extends along and downwardly from about a portion of the housing and further includes an inlet for drawing intake air into the chamber. The air cleaner having a base member in fluid communication with the chamber and an outlet, where the air drawn into the chamber is filtered by first and second filtering operations to obtain filtered air, with the first and the second filtering operations accomplished at least in part due to a cyclonic motion of the air and passage of the air through the filter element, respectively; and where the filtered air from the chamber of the housing is released through the outlet in the base member.

Abstract: A cyclonic separator comprising a first cyclone stage, a second cyclone stage and an inlet duct. The first cyclone stage comprises a cyclone chamber and a first dirt collection chamber. The second cyclone stage is located downstream of the first cyclone stage and comprises a second dirt collection chamber. The inlet duct carries fluid from an opening in the base of the cyclonic separator to the cyclone chamber, and the first dirt collection chamber surrounds at least partly the inlet duct and the second dirt collection chamber.

Abstract: A cyclone dust collector having a single or multiple dust collection bodies installed within a housing, wherein the dust collection body is composed of an upper primary cylindrical dust collection part and a lower secondary conical duct collection part, and a single or multiple slits are cut in the wall surfaces of the primary and secondary dust collection parts in such a manner that large dust particles with large inertial force are removed between the dust collection housing and the dust collection body via the slit(s), while small dust particles with small inertial force make a swirling flow motion within the dust collection body and are removed by the centrifugal force.

Abstract: A cyclone separator (100; 100?) including a first cyclone component (10; 10?) having at least one substantially cylindrical cell pipe (12) including a guide device (14), a particle outlet (30) for separated particles, and a second cyclone component (20; 20?) including at least one immersion pipe (22). The immersion pipe (22) is received in the cell pipe (12), at the outflow side end and is connected at least partially to the outflow side end of the cell pipe (12) and includes a central outlet (24) for the purified gas stream.

Abstract: A two stage filter device includes a cyclonic pre-separator (10) designed as a pre-filter that separates the particles from the gas flow and a main filter element (20) arranged downstream as a second stage operable to filter by guiding the particles through at least one filter medium (24). The main filter element (20) is received in a filter housing (30). The main filter element (20) includes at least one retaining element (22) for stabilizing the position of the main filter element (20) in the housing (30).

Abstract: An air filtration unit for conveying bulk granular material from a tank trailer, and uses air pressure to achieve granular flow, the air filtration unit incorporates an intake that induces a spiral flow, the unit incorporates a lid at the back end of the filter housing, and a baffle structure at the intake inlet of the unit, to dampen sound.

Abstract: A versatile compact air precleaner, air cleaning method and disposable air filter cartridge for air precleaner for separating heavier-than-air particulate debris from debris laden air to provide a clean airflow, wherein a flow path for air passing through a separator chamber of the air precleaner is retroflexed en route to the outlet. A plurality of independently rotatably adjustable housing sections of a housing provide utility with multiple clean air outlet configurations, freedom of direction of ejection of particulate debris from the ejector ports, different inlet configurations, mounting of the precleaner from different sides, accommodation of different sizes of filters, and different clean airflow rate capabilities. A separator chamber end section including the ejector ports is connected to the filter as a removable, disposable air filter cartridge to obviate ejector port clogging with change of filters.

Abstract: A wet gas separator providing superior separation of entrained droplets of liquids in a gas stream when compared with prior art wet gas separators. The wet gas separator of the present invention has a combination of: a gas inlet system with vanes that divide and direct the gas stream very evenly across the cross-sectional area of the inlet portion of the apparatus, a first stage Z-shaped de-entraining device at the upstream side of a wire mesh mist eliminator, and a gas outlet system having cyclones for removal of traces of re-entrained droplets. The apparatus of the present invention has capability of improving processing throughput by 50% when compared with prior art apparatus, with greater de-entrainment efficiency (achieving 99.7% removal of droplets larger than 10 microns in size).

Abstract: A filtration device 8 for filtering air used with a fuel vapor recovery system 100 may comprise a housing comprising an upper end 10 having at least one air inlet 18 and a lower end 12 having at least one air outlet 26, a first passageway 32 in fluid communication with the air inlet 18 and configured to increase the velocity of the air through the first passageway 32 compared to the air inlet 18, a collection cavity 34 in fluid communication the first passageway 32 and configured to reduce the velocity and abruptly change the direction of the air through the collection cavity 34 compared to the first passageway 32, a filter cavity 14 in fluid communication with the collection cavity 34 comprising a filtering media 16, and a clean air cavity 40 in fluid communication with the filter cavity 14 and the air outlet 26 of the housing.

Abstract: Disclosed is a dust collector provided with a dust-removing unit. The disclosed dust collector comprises: a first centrifugal separating tube defining a first centrifugal area for separating dust from air suctioned in through a first inlet; a first dust box for collecting dust separated in the first centrifugal area; a first detaching portion having a first exhaust pipe unit for exhausting the air from the first centrifugal separating tube and the first dust box to the outside; and a handle unit for maintaining the first centrifugal separating tube and the first dust box coupled together, or for releasing the coupling thereof.

Abstract: A cyclonic separator comprising a ring of cyclone bodies and an outlet duct through which cleansed fluid is discharged from the cyclonic separator, wherein the outlet duct extends between two adjacent cyclone bodies.

Abstract: A cyclonic separator comprising a cyclone chamber defined between an outer wall and a shroud. The shroud comprises an inlet opening through which fluid enters the cyclone chamber, and a plurality of perforations through which fluid exits the cyclone chamber. Fluid within the cyclone chamber is then free to spiral about the shroud and over the inlet opening.

Abstract: A filter element, a safety element and fluid cleaner assembly. The fluid cleaner assembly generally includes a housing having a cover and a primary fluid cleaner section. The element generally comprises z-filter media, arranged in a straight through configuration, and an axial seal gasket positioned to extend continuously around at outer perimeter of the straight through flow construction. The fluid cleaner assembly can have a precleaner positioned therein. Methods of assembly and use are provided.

Abstract: Dynamic cyclone separator, with an axial flow, having a variable configuration and tubular structure (1) comprising: vortex-generating means (2) having a variable configuration, consisting of a central support (3) and a plurality of axial fins (4) having an adjustable tilt; a central support (3) having an ogival configuration which is such as to define with the outer tubular structure (1) a convergent-divergent duct in which the gas expands adiabatically; a tubular porous wall (1b) in the area of maximum velocity for capturing the particulate.

Abstract: A hand-holdable vacuum cleaner comprising: a motor coupled to a fan for generating air flow; a battery pack housing at least one rechargeable cell for powering the motor; a body with a handle; a dirty air duct with a dirty air inlet; and a dirt separating means located in a path of the air flow generated by the fan, wherein the dirt separating means comprises: a hollow substantially cylindrical dirt container with a longitudinal central axis arranged transverse the body; and an air inlet port to the dirt container, wherein the air inlet port is in communication with the dirty air duct, wherein the dirt container is rotatingly connected to the body to pivot, with the battery pack, about the central axis between a folded position and an extended position diametrically opposed to the folded position.

Abstract: An apparatus for filtration of solid particles and separation of liquid droplets and liquid aerosols from a gas stream for installation in a vessel comprises a cyclonic separator for coarse separation of solid particles and separation of liquid droplets and liquid aerosols from the gas stream. The cyclonic separator has one or more slots or perforations. A filter element for fine filtration from the gas stream has an inlet for receipt of the gas stream directly from a gas outlet of the cyclonic separator. A shroud partitions the one or more slots or perforations from a dry gas volume of the vessel.

Abstract: A dust collecting apparatus for a vacuum cleaner is provided. The dust collecting apparatus includes a centrifugal separating portion, a dust receptacle to collect dust which is separated by the centrifugal separating portion and a filter portion having a filter unit separating dust from an air current discharged from the centrifugal separating portion. The filtering portion further includes a dust removing unit to detach the filter dust caught in the filter unit, and a dust discharge member to move the filter dust to an upstream of the centrifugal separating portion.

Abstract: An air cleaner device for filtering intake air including a housing defining a chamber, a filter element disposed within the chamber, and a duct element having a passageway in fluid communication with the chamber. Further, the duct element extends along and downwardly from about a portion of the housing and further includes an inlet for drawing intake air into the chamber. The air cleaner having a base member in fluid communication with the chamber and an outlet, where the air drawn into the chamber is filtered by first and second filtering operations to obtain filtered air, with the first and the second filtering operations accomplished at least in part due to a cyclonic motion of the air and passage of the air through the filter element, respectively; and where the filtered air from the chamber of the housing is released through the outlet in the base member.

Abstract: The invention hereby disclosed is a vertical filtering and separating suction machine of chips, steam and smoke for machining center, lathe machine or other machines, which operates by sudden changes of sucked air, thus generating hits which separate heavy particles, whose suction pipe extends almost up to the bottom of the rotor, which only uses filters at the end of the process of air purification, whose rotor has outer paddles modified in order to improve suction power and to cause more hits of air flow, and which includes an air pressure alarm showing the filter is saturated.

Abstract: The present invention relates to a separating apparatus for separating particles from a fluid flow. Particularly, but not exclusively, the invention relates to a vacuum cleaner having such a separating apparatus for removing dust particles from a dust laden airstream. The separating apparatus includes a first cyclonic cleaning stage including at least one cyclone, and an electrostatic filter located downstream of and in fluid communication with the at least one cyclone, wherein at least a portion of the electrostatic filter is located longitudinally through the separating apparatus, at least a portion of the first cyclonic cleaning stage being arranged around the electrostatic filter.

Abstract: A gas/liquid separator (1) assembly is provided. The assembly generally comprises a vessel with at least one internally received serviceable separator element (10) arrangement. A unique inlet baffle arrangement (36,39) is provided, to facilitate preseparation of liquid from gases, as gases are passed through the assembly. The assembly is particularly adapted for use in air/oil separation, for example for compressors. Methods of assembly and use are also described.

Abstract: The invention relates to a separator (1) for a crankcase ventilation of an internal combustion engine. The separator (1) comprises at least one swirl chamber (2), which extends along a longitudinal axis (3), wherein said swirl chamber (2) has a tangential inlet for a ventilation flow (6) at an intake-side end (4) relative to the longitudinal axis (3) thereof. The swirl chamber (2) additionally has a shared outlet (8) for the ventilation flow (6) and oil (9) entrained with the ventilation flow (6) on the outlet-side end thereof opposite the intake-side end (4) relative to the longitudinal axis (3), wherein a post-separator (10) is disposed downstream of the swirl chamber (2).

Abstract: Air filter comprising a preseparator with an optimized intake geometry, wherein an outflow geometry of a preseparator is matched to an intake geometry of a filter element.

Abstract: Separation device or unit for separating liquid from an inlet flow which mainly contains gas, has a container or a pipe section with an outlet for gas from the container or the pipe section, an outlet for liquid from the container or pipe section and an inlet for the inlet flow to the container or pipe section. The device has a flow manifold arranged to receive and direct the inlet flow towards a porous pipe body extending towards the gas outlet and arranged to receive all or most of the inlet flow. Part of the flow is flowing through the tubular body to the gas outlet, while the remaining flow is flowing through the tubular body's porous wall, and an annular space including the volume between the tubular body and the container wall or pipe section is open for gas flow towards the gas outlet.

Abstract: A particle reduction system and method is disclosed having an air stream accelerator, a feeder assembly, a variable speed wheel lock operably associated with the feeder assembly for releasing raw material into a conveying air stream created by the positive displacement pump, and a particle conditioning assembly. The raw material is carried by the conveying air stream through the particle conditioning assembly, where particle of the material are collided with each other for the purpose of reducing the size of the particles. In some embodiments, a non-thermal drying system can be used to extract moisture from the raw material. The moisture/solids separation occurs, in large part, due to a head-on collision of two conveying air streams. The collision creates a large squeezing force, much higher than a centrifuge or filter. This impact squeezing acts to squeeze the moisture out of the raw material.

Abstract: A surface cleaning apparatus may comprise an air flow path extending from a dirty air inlet to a clean air outlet and a suction motor. The surface cleaning apparatus may comprise a cyclone chamber provided in the air flow path. The cyclone chamber may comprise a cyclone chamber first end and a cyclone chamber second opposed end, a cyclone air inlet, a cyclone air outlet provided at the cyclone chamber second opposed end and a cyclone chamber wall. An air exit conduit may be exterior to the cyclone chamber and may extend from the cyclone air outlet. At least one reinforcing rib may be positioned in abutting relationship with the air exit conduit and the cyclone chamber second opposed end.

Abstract: A surface cleaning apparatus comprises an air flow path extending from a dirty air inlet to a clean air outlet, an air treatment member and a suction motor. The surface cleaning apparatus comprises a main body comprising a front end and a rear end, first and second opposed sidewalls and a suction motor housing. At least one of the first and second opposed sidewalls may have a suction motor access opening.

Abstract: [Problem to be Solved] To enhance the performance for separation of oil mist from blow-by gas. [Solution] A filter element 13 which is to be attached to an oil separator unit 3 includes a core 31. This core is a double tube having an internal cylindrical member 34 and an external cylindrical member 35, and a space between the internal cylindrical member and the external cylindrical member is used as a separation chamber 36. An injection hole 39 for injecting blow-by gas while increasing its flow velocity is provided in the internal cylindrical member. A surface which is an inner wall surface of the external cylindrical member and which faces the injection hole is a spraying surface onto which the blow-by gas injected from the injection hole is sprayed. Moreover, an opening for oil discharge from which oil OL condensed on the spraying surface is discharged, and an opening for discharge from which the blow-by gas from which oil mist has been separated is discharged are provided in the core.

Abstract: A dust collection system has a cyclone separator in which dust is separated from an air stream and the air stream is passed from a separator and flows through a final filter back into the ambient air. A flame arrester is positioned downstream of the separator, either in advance of or after the final filter. The flame arrester defines a multiplicity of narrow channels to permit exhaust air flow but block any flame front. In a preferred embodiment the flame arrester is in the form of a sheath of a porous metal material surrounding the final filter. The sheath may comprise a metal wire mesh screen, with a guard cage surrounding the screen.

Abstract: The invention relates to a portable, hand-held work apparatus such as a chain saw, a cut-off machine, a brush cutter or the like with an air cooled combustion engine. A cooling air blower (4) which includes a cooling air spiral (6) and a fan wheel (5), moves a cooling air flow (13) for cooling the combustion engine. Further a combustion air channel (30) leads from the cooling air blower (4) to the combustion engine (2) and branches off from an air output window (20) provided in the base (14) of the cooling air spiral (6). The diverting device (21) includes a guide wall (22) which extends into the cooling air spiral (6) between the fan wheel (5) and the air output window (20). In order to divert a large volume of combustion air (19) with minimal disruption to the cooling air flow, the pass-through cross-section of the air output window (20) tapers in the direction of the diverted combustion air (19) from a first pass-through area (29) to a second pass-through area (31).

Abstract: A dust collection arrangement employs a variable frequency drive to supply AC to its fan motor. A current sensor measures the current drawn by the motor, and this is compared with a preset value. The variable frequency drive adjusts the frequency of the AC applied to the motor to maintain the motor current at the preset level. This keeps the flow of air in the system optimal as dust producing tools are added or taken off.

Abstract: A dust collector arrangement has a dust separator supported on a frame, with a lid for the dust collection barrel is mounted onto the frame below it. The lid is supported at a fixed elevation above the surface of the shop floor to create a space or clearance between the rim of the dust collection barrel and the lid. The barrel is supported on casters, and can be rolled into place under the rim, and can be rolled out for emptying. Over-center latches positioned at intervals around the upper part of the barrel side wall, engage corresponding structure on the lid. These pull the barrel upwards against the lid and with the barrel casters lifted off the floor surface. The latch members release to lower the barrel for emptying.

Abstract: A filter apparatus comprises first and second filters, each having an upstream surface and a downstream surface. At least one bypass channel extends from a position upstream of the upstream surface of the first filter to a position upstream of the upstream surface of the second filter.

Abstract: A separating apparatus comprises a first cyclonic separating unit and a second cyclonic separating unit located fluidly downstream therefrom and including a plurality of second cyclones arranged fluidly in parallel about a first axis and grouped into at least a first and second set of second cyclones arranged about the first axis. Each cyclone in the first and second sets of second cyclones defines a longitudinal axis and includes a fluid inlet and a fluid outlet. The fluid inlets of the first set of second cyclones are spaced along the first axis from the fluid inlets of the second set of second cyclones, and each outlet of the cyclones in the first and second sets of second cyclones is in fluid communication with an outlet duct, wherein the outlet duct includes a first portion which extends between two of the cyclones of at least the first set of second cyclones.

Abstract: An oil separating device is provided with a first and a second separator element that are arranged parallel to one another and are positioned in a separate first and a second flow path, respectively. The oil/air stream to be cleaned is alternatingly introduced into the first flow path with the first separator element or into the second flow path provided with the second separator element.

Abstract: The invention relates to a vacuum cleaner filter bag, including an inlet opening (3), a filter bag material which has an inner layer of nonwoven material (10) at least in the region of the inlet opening, and a holding plate (2) which is arranged on the outside of the filter bag in the region of the inlet opening, can be attached to a vacuum cleaner holding means for securing the vacuum cleaner filter bag and on which a closure device (4) for closing the inlet opening is provided, wherein the nonwoven material, in the region of the inlet opening, has a surface (20) which is provided in such a manner that the formation of a filter cake on said surface is avoided.

Abstract: A centrifugal separator comprises a filtered-gas passageway, a spinner, and a drive mechanism. The filtered-gas passageway has an inlet. The spinner is configured and adapted to rotate about a spinner axis relative to the filtered-gas passageway, and has an inner cavity, a gas permeable outer wall, and a plurality of protrusions that extend radially outward from the gas permeable outer wall relative to the spinner axis. The inner cavity of the spinner is operatively connected to the inlet of the filtered-gas passageway. The drive mechanism is adapted to rotate the spinner about the spinner axis at a rate such that the protrusions prevent particulates from passing through the gas permeable outer wall and into the inner cavity of the spinner and such that gaseous matter is able to pass through the gas permeable outer wall, into the inner cavity, and thereafter into the filtered-gas passageway via the inlet.

Abstract: A vacuum cleaner includes an electric air blower; a dust separator placed at an upstream side of the electric air blower and having a filtration filter for taking in dust-containing air sucked by the electric air blower and separating the dust from the air; and a dust accommodating section for accommodating the dust separated by the dust separator. The filtration filter includes a plurality of through-holes penetrating from an upstream surface at an upstream side to a downstream surface at the downstream side, and a central axis of the through-hole is inclined with respect to a normal line direction of a surface of the filtration filter.

Abstract: A handheld cleaning appliance includes a dirty air inlet, a clean air outlet and separating apparatus for separating dirt and dust from an airflow in an airflow path leading from the air inlet to the air outlet. The separating apparatus includes a cyclonic separator having at least one first cyclone and a plurality of second cyclones arranged in parallel with one another and located downstream of the first cyclone. By providing a cyclonic separator having a plurality of second cyclones in parallel, the handheld cleaning appliance is capable of separating fine dirt and dust particles without using barriers such as filters or bags which need maintenance to ensure that performance remains high over a period of time.

Abstract: A combined degassing and flotation tank for separation of a water influent containing considerable amounts of oil and gas. A rotational flow is created in the tank which forces the lighter components such as oil and gas droplets towards an inner concentric cylindrical wall where they coalesce and rise to the surface of the liquid and are removed via the outlet. The heavier particles are forced down and sink to the lower part where they can be removed as a sludge. The water is discharged via an outlet in the lower part of the tank. The combined degassing and flotation tank is particular suited for use in oil production at sea for removal of oil and gases from water streams before the water is returned to the sea.

Abstract: A filtration apparatus includes at least three filter elements for filtering fluid, and a frame having a pyramidal frustum configuration that has at least three sides. The frame includes a frame structure for supporting the filter elements at the sides such that the filtration apparatus has a pyramidal frustum configuration. The filtration apparatus may be part of a filtration assembly. The filtration apparatus may be utilized within an associated method.

Abstract: A motor, fan and cyclonic separation apparatus arrangement for a vacuum cleaner, the arrangement comprising: a motor coupled to a fan for generating air flow; a cyclonic separation apparatus located in a path of the air flow generated by the fan; and a pre-fan filter located in the path of the air flow downstream of the cyclonic separation apparatus and upstream of the fan, wherein the cyclonic separation apparatus comprises at least one cyclone comprising: a cyclone body with a longitudinal axis; an air inlet port arranged tangentially through a side of the cyclone body; and an air outlet port through a longitudinal end of the cyclone body, wherein the pre-fan filter is arranged upon the air outlet port of the or each cyclone.

Abstract: In at least some embodiments, the present invention relates to an air cleaner having a housing portion, and a low profile rain cover having an opening on an underside of the cover to allow unfiltered air to enter into the air cleaner. Also, in at least some embodiments, the present invention relates to an air cleaner including a housing and an additional component by which the air cleaner is capable of being directly coupled to a carburetor inlet. In some such embodiments, one or more protrusions can be provided within a channel formed by the housing/additional component to influence air flow. Further, in at least some embodiments, the present invention relates to an air cleaner having a shaped wall formed on a housing portion, where the shaped wall includes both an interior surface and an exterior surface by which air flowing within the air cleaner is imparted with helical motion.

Abstract: The present invention relates to a separating apparatus for separating particles from a fluid flow. Particularly, but not exclusively, the invention relates to a domestic vacuum cleaner having such a separating apparatus for removing dust particles from a dust laden airstream. The separating apparatus includes a first cyclonic cleaning stage including at least one cyclone, and an electrostatic filter, wherein the electrostatic filter is in fluid communication with the at least one cyclone via an air passage, at least a portion of the air passage being formed longitudinally through the separating apparatus, wherein at least a portion of the first cyclonic cleaning stage, the electrostatic filter and the air passage are arranged concentrically.

Abstract: A dirt cup for a vacuum cleaner including a container, a tube, a lid, a first chamber, a second chamber, and a seal. The container includes an open bottom end. The lid is coupled to the container. The lid includes an aperture that extends through the lid. The lid is movable between a closed position where the lid covers the open bottom end and an open position for emptying the container through the open bottom end. The seal is coupled to the lid and includes a flange and a post that extends from the flange. The post extends into the aperture of the lid to couple the seal to the lid. The seal is positioned between the lid and the tube when the lid is in the closed position to inhibit airflow between the first chamber and the second chamber.

Abstract: An improved vehicle air filter includes a cylindrical housing having a continuous outer wall, a releasable bottom wall and an open top in communication with an interior air-delivery chamber. Circumferentially disposed about the outer wall are a plurality of conical air-intake tubes, each having an inlet opening in fluid communication with a hollow interior. The lower end of each tube is positioned immediately above a collection pan formed on the releasable bottom wall. An arcuate air conduit extends from the upper end of each tube to the air-delivery chamber. As air enters each tube, it flows along a cyclonic path to force entrained particles against the interior surface of the tube and downwardly into the collection pan. Meanwhile, the purified air flows upwardly through the air conduits and into the air-delivery chamber for distribution to the vehicle engine.

Abstract: The present invention relates to a spray drying system provided with a gas filtering system, which system is intended for use in the pharmaceutical industry for aseptic production of sterile pharmaceutical products or in other industries e.g. production of food, where an intake of sterile air for the drying process is necessary. The spray drying system for providing a particulate material comprises a spray drying chamber (3), after treatment equipment (4, 5) placed downstream of the spray drying chamber and a process gas heater (2) placed upstream in relation to the spray drying chamber (3), wherein an inlet filter (1) capable of removing microorganisms at a temperature below 140° C., is placed upstream of the process gas heater (2) and that the process gas heater (2) is a non-flaking heater.

Abstract: A dust collector of the present invention includes a main body, a first dust container, and two lifting apparatuses. The main body includes a shell, an expandable pipe, and a lid. The expandable pipe, which is vertically expandable, is connected between the shell and the lid. The first dust container is detachably disposed on the main body and is used to be selectively covered by the lid. The two lifting apparatuses respectively include a base, a linking up mechanism, and an operating rod. The two bases are respectively fixed on two sides of an outer wall surface of the shell. The operating rod is movably disposed on the base. One end of the linking up mechanism is disposed on the operating rod, and the other end is fixed on the lid. Thereby, the lifting apparatus can horizontally lift the lid.

Abstract: A filter device (10), especially an air filter for an internal combustion engine, includes a main filter element (22) arranged in a filter housing (12). The main filter element is flown through by a fluid to be filtered. The main filter element (22) is a multi-bellows filter having radially nested filter bellows (32, 34). Between the filter bellows (32, 34) a flow space (44) for the fluid is formed communicating with an end face of the main filter element (22), wherein each one of the filter bellows (32, 34) is embodied as a star-shaped filter with filter folds arranged in a star shape. On at least one end face of the main filter element (22) there is a seal (36) between one of the filter bellows (32, 34) and the filter housing (12).