Projection device

A projection device, comprising a casing, a projection lens, a light valve module, a light source module, a first heat dissipation module, a second heat dissipation module, a fan, and a guiding member, wherein:

• the casing has a first side cover, a second side cover, a third side cover, and a fourth side cover, the first side cover, the second side cover, the third side cover, and the fourth side cover define an accommodating space, the first side cover is opposite to the third side cover and connected to the second side cover and the fourth side cover, the second side cover is opposite to the fourth side cover, the first side cover has a first air inlet, the second side cover has a second air inlet, the third side cover has an air outlet, the fourth side cover is provided without an air inlet and an air outlet;
• the first heat dissipation module, the second heat dissipation module, the light valve module, and the light source module are disposed in the accommodating space, the first heat dissipation module is disposed corresponding to the first air inlet and connected to one of the light valve module or the light source module, the second heat dissipation module is disposed corresponding to the second air inlet and connected to the other one of the light valve module or the light source module;
• the guiding member and the fan are disposed in the accommodation space of the casing and are adjacent to the third side cover, an airflow in the accommodating space of the casing is guided to the guiding member by the fan, and is transmitted from the guiding member to the air outlet to flow out of the casing;
• and
• the projection lens protrudes from the fourth side cover, and a direction of an image beam projected from the projection lens is different from an airflow direction flowing out from the air outlet of the third side cover,
• wherein the fan comprises an air inlet surface facing the first side cover, and the guiding member is adjacent to the air outlet of the third side cover.