Heat dissipation structure of heat generating component
A heat dissipation structure of a heat generating component includes a heat conductive plate that includes a heat receiving connecting part thermally connected to the heat generating component and a heat dissipation connecting part thermally connected to the chassis and an air cooling fan that generates cooling air for cooling the heat conductive plate. The heat conductive plate further includes a first heat dissipation area from which heat is dissipated by flowing the cooling air along a surface of the plate and a second heat dissipation area that is bent and extends from the first heat dissipation area so as to cross an advancing direction of the cooling air that flows along the surface of the plate at the first heat dissipation area, and from which heat is dissipated by receiving the cooling air that has flown along the surface of the plate at the first heat dissipation area.
1. A heat dissipation structure of a heat generating component that is mounted on a wiring substrate housed in an interior of a chassis of an electronic equipment, the heat dissipation structure comprising:
a heat conductive plate arranged in the interior of the chassis, the heat conductive plate including a heat receiving connecting part thermally connected to the heat generating component and a heat dissipation connecting part thermally connected to the chassis; and
an air cooling fan that generates cooling air for cooling the heat conductive plate in the interior of the chassis, wherein
the heat conductive plate further includes (i) a first heat dissipation area from which heat is dissipated by flowing the cooling air generated by the air cooling fan along a surface of the heat conductive plate and (ii) a second heat dissipation area that is bent and extends from the first heat dissipation area so as to cross an advancing direction of the cooling air that flows along the surface of the heat conductive plate at the first heat dissipation area, and from which heat is dissipated by receiving the cooling air that has flown along the surface of the heat conductive plate at the first heat dissipation area,
the heat conductive plate includes a first end located adjacent to an air outlet of the chassis, and a second end located adjacent to the air cooling fan,
the heat conductive plate forms part of a duct passage through which the cooling air flows in the advancing direction from the second end toward the first end before being exhausted through the air outlet of the chassis,
the duct passage has a width in a direction that crosses the advancing direction of the cooling air,
the second heat dissipation area is located adjacent to the first end of the heat conductive plate and is thermally connected to the chassis, and
a first portion of the cooling air that has flown along the surface of the heat conductive plate at the first heat dissipation area collides with the second heat dissipation area and a second portion of the cooling air that has flown along the surface of the heat conductive plate at the first heat dissipation area bypasses the second heat dissipation area before exiting the chassis through the air outlet of the chassis.
2. The heat dissipation structure according to claim 1 , wherein
the heat dissipation connecting part is bent and extends from the second heat dissipation area, and is surface connected to the chassis.
3. The heat dissipation structure according to claim 1 , wherein
the first heat dissipation area is formed in a duct shape, and a part of the duct passage through which the cooling air flows is formed inside the first heat dissipation area.
4. The heat dissipation structure according to claim 3 , wherein
the first heat dissipation area is formed in the duct shape by combining the first heat dissipation area with an internal chassis plate that is arranged above the first heat dissipation area in the interior of the chassis.
5. The heat dissipation structure according to claim 4 , wherein
the internal chassis plate is a substrate holder that supports another wiring substrate in an upper stage arranged above the wiring substrate on which the heat generating component is mounted.
6. The heat dissipation structure according to claim 3 , wherein
the second heat dissipation area extends from a position corresponding to a downstream end side of the duct passage in the first heat dissipation area.
7. The heat dissipation structure according to claim 1 , wherein
a width of the heat conductive plate at the second heat dissipation area is less than the width of the duct passage.
8. A heat dissipation structure of a heat generating component that is mounted on a wiring substrate housed in an interior of a chassis of an electronic equipment, the heat dissipation structure comprising:
a heat conductive plate arranged in the interior of the chassis, the heat conductive plate including a heat receiving connecting part thermally connected to the heat generating component and a heat dissipation connecting part thermally connected to the chassis; and
an air cooling fan that generates cooling air for cooling the heat conductive plate in the interior of the chassis, wherein
the heat conductive plate further includes (i) a first heat dissipation area from which heat is dissipated by flowing the cooling air generated by the air cooling fan along a surface of the heat conductive plate and (ii) a second heat dissipation area that is bent and extends from the first heat dissipation area so as to cross an advancing direction of the cooling air that flows along the surface of the heat conductive plate at the first heat dissipation area, and from which heat is dissipated by receiving the cooling air that has flown along the surface of the heat conductive plate at the first heat dissipation area,
the first heat dissipation area is formed in a duct shape, and a duct passage through which the cooling air flows is formed inside the first heat dissipation area,
the first heat dissipation area is formed in the duct shape by combining the first heat dissipation area with an internal chassis plate that is arranged above the first heat dissipation area in the interior of the chassis,
the first heat dissipation area includes (i) a bottom plate that includes the heat receiving connecting part, faces and extends along the wiring substrate on which the heat generating component is mounted, and defines a bottom surface of the duct passage, and (ii) a pair of side plates that stands up from both side ends of the bottom plate toward the internal chassis plate and defines both side surfaces of the duct passage,
a duct upper surface area of the internal chassis plate that faces the bottom plate defines an upper surface of the duct passage, and
a guide convex portion that protrudes toward an inside of the duct passage and has a guide surface for guiding the cooling air to the heat receiving connecting part is formed in the duct upper surface area.
9. The heat dissipation structure according to claim 8 , wherein
the guide convex portion is provided in a position above the heat receiving connecting part.
10. The heat dissipation structure according to claim 8 , wherein
in a position corresponding to the heat receiving connecting part of the bottom plate, a concave portion that is recessed relative to a surrounding portion is formed.