Fine filter structure

摘要

The present invention is to provide a fine filter structure including two filter units, wherein the first filter unit comprises an upper frame, a coarse screen laid over top side of the upper frame, and a post having a top end formed with at least one through hole, a bottom end fixedly provided on top side of the coarse screen, and a channel in communication with each through hole and bottom side of the coarse screen; and the second filter unit comprises a lower frame and a fine screen laid over top side of the lower frame and having more mesh openings per unit area than the coarse screen. The top side of the lower frame can be connected with the bottom side of the upper frame so as not only to form a single unit but also to form a re-filtration space between the coarse screen and fine screen.

主权项

1. A fine filter structure, to be installed in a cup-shaped body of a brewing container, the fine filter structure comprising:
a first extraction filter unit comprising: an upper frame main body having a hollow central portion; wherein the bottom side of the upper frame main body is provided with a plurality of first connecting portions, each said first connecting portion comprises a recess and an insertion post provided on a bottom surface of the recess, each said recess is provided on a bottom side of the upper frame main body and is concave toward a to side of the upper frame main body, and each said insertion post extends downward from the upper frame main body; a coarse screen laid on the top side of the upper frame main body; and a post which has a bottom end fixedly provided on the top side of the upper frame main body above the coarse screen, is of a length of at least 2 cm, is provided therein with a channel, and has a top end formed with at least a through hole, wherein the channel is in communication with each said through hole and a bottom side of the coarse screen; and a second extraction filter unit comprising: a lower frame main body having a hollow central portion; wherein the lower frame main body is peripherally provided with a plurality of second connecting portions, each said second connecting portion is connectable with one said first connecting portion and comprises a block and an insertion hole, each said block has an outer edge which faces away from the lower frame main body and is concavely provided with a said insertion hole, each said insertion hole extends through a top side and a bottom side of a corresponding said block and, when the lower frame main body and the upper frame main body are connected with each other, the blocks are respectively engaged in the recesses, and the insertion posts are respectively engaged in the insertion holes; and a fine screen laid on a top side of the lower frame main body and having more mesh openings per unit area than the coarse screen, wherein the top side of the lower frame main body is connectable with the bottom side of the upper frame main body such that a re-filtration space is formed between the fine screen and the coarse screen.