초록 ▼

A filter system 10 includes a pre-filter in a pre-filter zone 18 and a final filter in a final filter zone 22. The pre-filter is in the form of at least one inertial filter, e.g. an array 28 of axial flow cyclones 30. The final filter is in the form of a media filter 36 formed of a lofted bat of fib

A filter system 10 includes a pre-filter in a pre-filter zone 18 and a final filter in a final filter zone 22. The pre-filter is in the form of at least one inertial filter, e.g. an array 28 of axial flow cyclones 30. The final filter is in the form of a media filter 36 formed of a lofted bat of fibrous material which is of non-homogeneous structure through its depth. An upstream side is lofty, and a downstream side is of set structure. A contaminated fluid flow stream enters via an inlet 12. Contaminants are filtered out by the axial flow cyclones to be removed via a dust cover 32. Pre-filtered fluid flows via a chamber 20 through the media filter 36. After final filtration in the media filter it exits via a chamber 24 and an outlet 14.

대표청구항 ▼

A filter apparatus including pre-filter means which comprises at least one axial flow vortex tube including a straight round outer tube having an inlet at one end which will be an upstream end in use and an opposed end which will be a downstream end in use, an axially arranged vortex generator downs

A filter apparatus including pre-filter means which comprises at least one axial flow vortex tube including a straight round outer tube having an inlet at one end which will be an upstream end in use and an opposed end which will be a downstream end in use, an axially arranged vortex generator downstream of said inlet, a separation region downstream of the vortex generator, an annular outlet region toward a periphery of the outer tube downstream of the separation region, a central outlet region in the centre of the outer tube downstream of the separation region, an inner round extraction tube which is arranged concentrically in the outer tube such as to separate the annular outlet region and the central outlet region, the extraction tube having an inlet end at a predetermined, relatively upstream, axial position corresponding to a downstream end of the separation region, and an outlet end at a predetermined, relatively upstream, axial position, said inlet end of the inner round extraction tube co-operating with the outer tube to define an annular inlet for the annular outlet region, and a contaminant exhaust for the annular outlet region downstream of said annular inlet for the annular outlet region; final filter means including a media filter element of fibrous material, the media filter element having a first side which will be an upstream side in use and a second side which will be a downstream side in use, having a depth corresponding to the spacing between said first side and said second side, being of non-homogenous structure through said depth, having a first depth portion extending from said first side only partially toward said second side, the first depth portion having a structure including fibres which are free from one another along major portions of lengths thereof which free portions are flexible and are at least slightly resilient such as to have a tendency to return to a relaxed condition after having been deformed, having a second depth portion adjacent and in series with said first depth portion toward the second side, the second depth portion having a structure including fibres which are relatively set by being attached to one another, at least intermittently, along major portions of their lengths.