AIR DUCT FAST-SWITCHING STRUCTURE FOR USE IN HEPA FILTER SELF-CLEANING VACUUM

摘要

An air duct fast-switching apparatus for use in a HEPA filter self-cleaning vacuum, comprising: a left diversion air duct (1312) and a right diversion air duct (1322) provided beside the left diversion air duct (1312). The left diversion air duct (1312) and the right diversion air duct (1322) are provided at a certain angle so that the left diversion air duct (1312) and the right diversion air duct (1322) converge and connect with each other at respective air duct distal ends. An airflow converging cavity (134) is provided beside and space apart from a left motor accommodating cavity (131) and a right motor accommodating cavity (132). A ventilation hole switching mechanism (17) is arranged within the airflow convergence cavity (134). While increasing structural compactness, reducing structure volume and complexity, this also reduces wind energy loss during an air duct switching process and working noise of the vacuum, thus increasing the efficiency in cleaning a HEPA filter and the service life of the HEPA filter.