Compact room air purifier with integrated gaskets
A room air purifier including upper and lower portions with the lower portion including a detachable floor panel. The upper portion and the floor panel may respectively include integrated resilient upper and lower gaskets configured so that with an air filter removably installed in the room air purifier and with the floor panel attached to a lower housing piece of the lower portion of the room air purifier, the upper portion of the room air purifier, and the floor panel, apply pressure to the air filter through the upper and lower gaskets.
1 . A room air purifier comprising:
an upper portion comprising an upper housing piece and a powered fan,
a lower portion comprising a lower housing piece;
an air-transmissive mandrel that is non-detachably attached to the upper portion of the room air purifier and is located in the lower portion of the room air purifier and that is configured to receive and support a disposable, generally cylindrical, unframed, compactable, pleated air filter,
the upper and lower portions of the room air purifier being non-detachably attached to each other and defining an airflow path through the room air purifier so that unfiltered air can enter through an air inlet of the lower housing piece and filtered air can exit through an air outlet of the upper housing piece, as motivated by the powered fan;
a lowermost floor panel that is detachably attached to a lower end of the lower housing piece of the lower portion of the room air purifier,
and,
a disposable, generally cylindrical, unframed, compactable, pleated air filter removably installed in the room air purifier by way of being disposed radially-outwardly on the mandrel with a pleat direction of the air filter aligned with a vertical axis of the room air purifier,
wherein the upper portion of the room air purifier comprises an integrated resilient upper gasket in the form of an upper annular ring with a major lower surface that is configured to accept an upper corrugated edge of the air filter thereagainst; and, wherein the floor panel of the room air purifier comprises an integrated resilient lower gasket with a major upper surface that is configured to accept a lower corrugated edge of the air filter thereagainst,
and wherein with the air filter installed in the room air purifier and with the floor panel attached to the lower end of the lower housing piece of the lower portion of the room air purifier, the upper portion of the room air purifier and the floor panel of the room air purifier apply pressure to the air filter through the upper and lower gaskets so that areas of the upper and lower gaskets that are in contact with the upper and lower corrugated edges of the pleated air filter are locally compressed by a compression factor of at least 10%.
2 . The room air purifier of claim 1 wherein with the air filter installed in the room air purifier and with the lowermost floor panel attached to the lower end of the lower housing piece of the lower portion of the room air purifier, the upper portion of the room air purifier and the lowermost floor panel of the room air purifier apply pressure to the air filter through the upper and lower gaskets so that the areas of the upper and lower gaskets that are in contact with the upper and lower corrugated edges of the air filter are locally compressed by a compression factor of from 30% to 70%.
3 . The room air purifier of claim 1 wherein at least the integrated resilient upper gasket exhibits a modified Compression Force Deflection value, at 50% compression, of 0.8 psi or less, and is from 2 to 10 mm thick.
4 . The room air purifier of claim 1 wherein the integrated resilient upper gasket comprises a radially-inward edge that is located radially-inwardly of all radially-inward pleat tips of the pleated air filter, and wherein the integrated resilient lower gasket comprises a radially-inward edge that is located radially-inwardly of all radially-inward pleat tips of the pleated air filter.
5 . The room air purifier of claim 1 wherein the upper and lower gaskets are each made of a polymeric foam that exhibits a density less than 0.2 grams per cc.
6 . The room air purifier of claim 1 wherein the upper gasket is disposed on a downward-facing gasket-seating surface of a waistpiece of the upper portion of the room air purifier; and, wherein the lower gasket is disposed on an upward-facing gasket-seating surface of the lowermost floor panel of the room air purifier.
7 . The room air purifier of claim 1 wherein the air filter exhibits a nominal pleat spacing of from 2.5 to 6 mm and a pleat height of from 15 to 25 mm.
8 . The room air purifier of claim 1 wherein the air filter is compactable so as to exhibit a volumetric compaction ratio of less than or equal to 30%.
9 . The room air purifier of claim 1 wherein the air filter comprises at least two elongate dams of hardened adhesive that extend along a longitudinal direction of the air filter and are spaced apart from each other along the pleat direction of the air filter, each dam being on a radially inward side of the air filter with no adhesive dam being on a radially outward side of the air filter.
10 . The room air purifier of claim 1 wherein the air filter comprises at least one removal and/or identification tab that is non-removably attached to a radially outward surface of the air filter.
11 . The room air purifier of claim 1 wherein the mandrel is non-detachably attached to the upper portion of the room air purifier.
12 . The room air purifier of claim 1 wherein with the air filter installed in the room air purifier and with the lowermost floor panel attached to the lower end of the lower housing piece of the lower portion of the room air purifier, no portion of the mandrel is in contact with any part of the lowermost floor panel of the room air purifier, so that the mandrel is a floating mandrel that does not support any of the weight of the upper portion of the room air purifier.
13 . The room air purifier of claim 12 wherein with the air filter installed in the room air purifier and with the lowermost floor panel attached to the lower end of the lower portion of the room air purifier, all parts of a lower end of the mandrel are vertically spaced above an upward-facing major surface of the lowermost floor panel of the room air purifier, so that an air gap is present between the lower end of the mandrel and the upward-facing major surface of the lowermost floor panel of the room air purifier.
14 . The room air purifier of claim 1 wherein the mandrel comprises a generally cylindrical air-transmissive first, upper portion that occupies from 70 to 95% of a total vertical height of the mandrel, and a frusto-conical air-transmissive second, lower portion that is an integral extension of the first portion and is tapered at a taper angle of from 6 to 20 degrees so that a diameter of a lower end of the second portion of the mandrel is between 88 and 98% of a diameter of the first portion of the mandrel.
15 . The room air purifier of claim 1 wherein the mandrel comprises an upper terminus with a radially-outwardmost surface that is radially-inwardly-recessed a distance of at least 1.0 mm relative to an area of a radially outward major surface of the mandrel that is adjacent the upper terminus, the inwardly-recessed surface extending around an entirety of a circumferential extent of the upper terminus of the mandrel and occupying a vertical height of at least 3.0 mm.
16 . A kit comprising the room air purifier of claim 1 with the air filter installed therein, along with at least one replacement air filter that is packaged in the kit outside of the room air purifier, the at least one replacement air filter being packaged in a compacted configuration in which the replacement air filter exhibits a volumetric compaction ratio of less than or equal to 30%.