Rear guard of box fan and box fan
US11015617B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Apr 23, 2018 |
| Grant date | May 25, 2021 |
| Priority date | — |
| Expiry date | Nov 13, 2038 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04D29/646
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A rear guard of a box fan comprises: a body arranged vertically and a waterproof part arranged on the body. The waterproof part is arranged in a position corresponding to a motor in the box fan and the waterproof part comprises a plurality of recessed structures arranged on the body. a plurality of vent holes are arranged on the body for communicating an inner side of the body with an outer side of the body are arranged in the recessed structures. By arranging the vent holes in the recessed structures, the waterproof effect is realized on the premise of ensuring ventilation, the electric leakage and ignition of the motor can be effectively prevented, and the lifetime of the motor of the box fan is extended.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.