Vaporization pipe with improved filter unit

摘要

Provided is filter unit for a vaporization pipe having improved reliability and manufacturability and lower cost. The present filter unit comprises a wooden filter housing with a through hole. A metal insert fitting is press fit into the hole. A ceramic foam flame filter is disposed inside the insert fitting. The insert fitting preferably has a step ledge for supporting the ceramic foam filter. The metal fitting preferably has a flange (external to the wood filter housing) for improving the stability of the mechanical connection between the insert fitting and filter housing. This design allows for fast assembly with a minimum of labor. Stress and damage to the wood is minimized. The filter housing can have a vertical/longitudinal wood grain direction (parallel with the filter housing hole), thereby reducing the cost of the wood parts and improving the finished appearance.

主权项

1. A filter unit attachable to a bowl of a vaporizing pipe, comprising:
a) a filter housing having a hole with an inlet and an outlet that are fluidically connected; b) a flame filter disposed in the hole, between the inlet and outlet; c) an insert fitting, comprising: 1) a tube portion disposed in the hole and attached to an inner surface of the hole; 2) a male threaded portion external to the filter housing hole; 3) a flange portion located between the tube portion and the male threaded portion, and disposed outside the filter housing hole wherein the filter unit is upstream of the bowl when attached.