| 摘要 |
To cool power semi-conductor elements such as current rectifiers, by means of a coolant circuit and a heat exchanger with forced ventilation, water and oil are generally used as primary coolant. However, these fluids have disadvantages, particularly a low insulating capacity with, as regards water, a practically inevitable contamination and a reduction of the insulating functions on the conductors outside the coolants resulting from the accumulation of dust at the oil leaking points. Other fluids, which are more appropriate, would require a non economical enlargement or the exchanger. To avoid these inconveniences, a secondary coolant liquid is used with an evaporator (6) through which passes the primary circuit which goes through the forced ventilated exchanger (3). Thus, part of the heat is dissipated by the exchanger and the remaining by the evaporator and the secondary circuit which avoids an enlargement of the exchanger when using a primary coolant particularly appropriate such as an inert type liquid. Appropriately, the condensor (11) of the secondary circuit is connected to the exchanger (3). |
