| CPC B01D 46/2411 (2013.01) [B01D 46/521 (2013.01); B01D 46/64 (2022.01)] | 6 Claims |
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1. A filter element comprising:
a filter body shaped like a hollow cylinder;
an upper cap attached to an upper end of the filter body; and
a lower cap attached to a lower end of the filter body, wherein
the filter body includes
a central space formed so as to extend inside the filter body along a central axis of the filter body,
an inner core that is shaped like a hollow cylinder so as to define the central space,
an inner filter member that surrounds a periphery of the inner core,
an outer core that is shaped like a hollow cylinder and surrounds a periphery of the inner filter member, and
an outer filter member that surrounds a periphery of the outer core, the upper cap includes
a nozzle that is fitted into an upper part of the central space and configured to introduce compressed air into the central space, and
a skirt that is shaped tubularly and surrounds a periphery of the outer filter member,
the lower cap includes a plug portion that plugs a lower end of the central space,
a central channel is formed in the central space between a lower end of the nozzle of the upper cap and an upper end of the plug portion of the lower cap,
vent holes are formed around a portion of the inner core that faces the central channel,
the outer core includes a perforated portion around which vent holes are formed and a non-perforated portion in which no vent hole is formed,
a region over which the non-perforated portion is formed along the central channel extends from a position above a central position of the central channel in an up-down direction to an upper end of the central channel, and
a region over which the perforated portion is formed along the central channel extends from a lower end of the non-perforated portion to a lower end of the central channel.
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