Cooler
A cooler is provided which includes a heat discharging unit in which a plurality of heat discharge fins are placed in a line and a coolant flows in a passage between the heat discharge fins, an inflow-side coolant reservoir provided extending in a lined direction of the heat discharge fins and connected to a side of one end of the passage between the heat discharge fins through a first diaphragm portion, and an outflow-side coolant reservoir provided extending in the lined direction of the heat discharge fins and connected to a side of the other end of the passage between the heat discharge fins through a second diaphragm portion. An inflow-side fin is formed on a surface of the inflow-side coolant reservoir opposing the first diaphragm portion, and a circulation cross-sectional area of the inflow-side coolant reservoir is set smaller than a circulation cross-sectional area of the outflow-side coolant reservoir.
1. A cooler comprising:
a heat discharge unit in which a plurality of heat discharge fins are placed in a line and a coolant flows through a passage between the heat discharge fins;
an inflow-side coolant reservoir provided extending in a lined direction of the heat discharge fins and connected to a side of one end of the passage between the heat discharge fins through a first diaphragm portion; and
an outflow-side coolant reservoir provided extending in the lined direction of the heat discharge fins and connected to a side of the other end of the passage between the heat discharge fins through a second diaphragm portion,
wherein the coolant supplied to the inflow-side coolant reservoir flows to the passage between the heat discharge fins through the first diaphragm portion and flows out to the outflow-side coolant reservoir through the second diaphragm portion;
at least one inflow-side fin is formed in a standing manner on a surface of the inflow-side coolant reservoir opposing the first diaphragm portion,
at least one outflow-side fin is formed in the standing manner on a surface of the outflow-side coolant reservoir opposing the second diaphragm portion,
the circulation cross sectional area of the inflow-side coolant reservoir that includes the at least one inflow-side fin is smaller than a circulation cross sectional area of the outflow-side coolant reservoir that includes the at least one outflow-side fin, and
wherein a circulation resistance of the inflow-side coolant reservoir, a circulation resistance of the outflow-side coolant reservoir, and circulation resistances of the first and second diaphragm portions satisfy a relationship of: (circulation resistances of the first and second diaphragm portions)>(circulation resistance of the outflow-side coolant reservoir)>(circulation resistance of the inflow-side coolant reservoir).
2. The cooler according to claim 1 , wherein the inflow-side fin is a non-oriented fin.
3. The cooler according to claim 2 , wherein the non-oriented fin is a pin fin.
4. The cooler according to claim 3 , wherein the pin fin is formed in a standing manner and not reaching a surface on which the first diaphragm portion is formed.
5. The cooler according to claim 3 , wherein the pin fin is formed in a standing manner and reaching a surface on which the first diaphragm portion is formed.
6. The cooler according to claim 1 , wherein each of the inflow-side fin and the outflow-side fin is a non-oriented fin.
7. The cooler according to claim 6 , wherein the non-oriented fin is a pin fin.