Protection device for air filter
US9545592B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 24, 2015 |
| Grant date | Jan 17, 2017 |
| Priority date | — |
| Expiry date | Nov 24, 2035 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D46/442
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
The present invention provides a protection device for air filter, which includes a dust sensor and an air filter protector, wherein, the air filter protector includes: a dust concentration comparator adapted for comparing a level signal transmitted by the dust sensor to represent a particle concentration of dust or smoke with a reference level, so as to output a positive or negative pulse signal according to a result of the comparison; a first inverter; a pulse generator and adapted for inverting a pulse signal outputted by the first inverter; a filtering comparator adapted for converting an output of the pulse generator into a high or low level signal; a relay switch adapted for performing on or off action according to the output of the filtering comparator, so as to control opening and closing of an air valve of the air filter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.