1. Field of the Invention
The invention relates in general to an air filtration device, and more particularly to an air filtration device applied to a projector.
2. Description of the Related Art
With advanced development in technology, electrical products are popularly used in people's daily life. However, waste heat is produced when the electrical products works so that it is necessary to spread heat effectively to keep the electrical products under appropriate temperature.
Conventionally, a lamp of a projector emits lights but also produces heat, and heat is spread by air convection. However, the surface of the lamp may be covered with dust or other particles suspended in the air so that the temperature distribution on the surface of the lamp is greatly affected and becomes uneven, which easily causes accident like lamp explosion. Therefore, a filter will be added to the projector for filtering out dust or other particulars suspended in the air.
When the filter is used for a period of time, dusts or other particles may be accumulated on the filter and the filter is obstructed so that the air can't pass through the filter. Then, heat produced from the lamp can not be spread by airflow successfully, and temperature of the lamp increases, which may cause the lamp to burst.
Therefore, it is necessary to replace the filter timely to ensure that the projector can work well. However, users cannot replace the filter of the projector by themselves. Once users want to replace the filter, they have to bring the projector to the customer office to disassemble the projector and then the filter can be taken out, which is very inconvenient.