Heat conduction unit for light valve and projection device
The present application provides a heat conduction unit for light valve and a projection device, used for conducting heat for light valve in the projection field. The tube set comprises a plurality of tubes, a central axis of the tube set is vertical or inclined to a surface of the tube upper cover or the tube lower cover, and the tube set is fixedly connected with the tube upper cover and the tube lower cover. And the materials of the tubes have good thermal conductivity. Tubes with good thermal conductivity are provided for the heat conduction unit and projection device. The structure is compact, the cost is reduced, and a good heat conduction effect is realized.
1 . A projection device, comprising a heat conduction unit, used for conducting heat for light valves, wherein the heat conduction unit comprises a tube set, a tube upper cover and a tube lower cover; the tube set comprises a plurality of tubes, a central axis of the tube set is vertical or inclined to a surface of the tube upper cover or the tube lower cover, and the tube set is fixedly connected with the tube upper cover and the tube lower cover;
an inner wall of the tube is provided with a plurality of grooves; or the inner wall of the tube is provided with a plurality of flaky protrusions extending along the center of the tube;
wherein the projection device further comprises a light source, a light valve, an external fan, an internal fan, a projection lens, an upper housing, a middle housing and a lower housing; the upper housing, the middle housing and the lower housing form an accommodating cavity, and the light valve and the heat conduction unit are arranged in the accommodating cavity;
the tube upper cover and the tube lower cover of the heat conduction unit face the upper housing and the lower housing respectively, inner walls of the plurality of tubes of the heat conduction unit are communicated with an accommodation area where the light valve is located and the accommodation area is sealed, and the internal fan is arranged between the lower housing and the tube lower cover; and
outer walls of the plurality of tubes of the heat conduction unit are communicated with outside air, and the external fan is installed at a side of the middle housing facing the tube set.
2 . The projection device of claim 1 , wherein the projection device further comprises a temperature control board, a first temperature sensor arranged on the outer wall or the inner wall of the tube, and a second temperature sensor arranged on the light valve; and the first temperature sensor, the second temperature sensor and the external fan are electrically connected to the temperature control board, and the temperature control board intelligently adjusts a rotational speed of the external fan according to temperature parameters of the first temperature sensor and the second temperature sensor.
3 . The projection device of claim 2 , wherein the temperature control board is configured to determine a current working state of the projection device, and judging whether the following conditions are met: the temperature parameter of the first temperature sensor detected in real time is greater than a first preset value set in the accommodation area corresponding to the first temperature sensor in the current working state, and the temperature parameter of the second temperature sensor detected is greater than a second preset value set in the accommodation area corresponding to the second temperature sensor in the current working state; when the conditions are met, acquire a difference value between the temperature parameter of the first temperature sensor and the temperature parameter of the second temperature sensor, and send a speed adjustment instruction corresponding to the difference value to the external fan.
4 . The projection device of claim 1 , wherein a cooling gas is provided in the accommodation area, and the internal fan is a vortex fan.
5 . The projection device of claim 1 , wherein a fitting plate extends from the tube upper cover or the tube lower cover; the projection device further comprises a semiconductor chilling plate, and a hot end surface of the semiconductor chilling plate abuts against the fitting plate.
6 . The projection device of claim 1 , wherein the tube set is fixedly connected with the tube upper cover and the tube lower cover by welding or interference fit.
7 . The projection device of claim 1 , wherein the tube is made of metal, comprising any one of aluminum, copper and aluminum alloy.
8 . The projection device of claim 1 , wherein a plurality of cross sections formed by the tube set on the surface of the tube upper cover or the tube lower cover are arranged in a matrix shape or a regular polygon shape; or a plurality of cross sections formed by the tube set on the surface of the tube upper cover or the tube lower cover are arranged in a ring shape.