Dual cooling system

A dual cooling system for circulating coolant along discrete paths while maintaining the coolant in said paths at predetermined temperature and pressure differentials, said system comprising segregated circuits for the coolant;

• coolant circulating pump means including a housing defining a pump chamber in each circuit, a rotatable partition means encompassed along its annular periphery by a segment of said housing extending axially of the axis of rotation of said partition means at a greater radial distance from the said axis that the annular periphery of said rotatable partition means, said rotatable partition means being in at least partial registration with said housing segment and cooperating therewith to form a common partition intermediate said chambers, said common partition having a restrictive passage defined between the annular periphery of said rotatable partition means and the encompassing housing segment for limited coolant migration between said chambers in a direction substantially parallel to the axis of rotation of said partition means, impeller means extending into said chambers from opposite surfaces of said partition means to effect coolant circulation within said circuits at the predetermined temperature and pressure differentials when said partition means is rotated;
• means to effect rotation of said partition means;
• heat exchanger means disposed within each circuit;
• and coolant make-up means common to said circuits and connected to a suction side of each pump chamber to replenish any coolant migrating between said chambers, whereby said rotatable partition means is adapted to be positioned within said housing alone a predetermined axis of rotation, and the restrictive passage between said rotatable partition means and said housing segment separating said coolant circuits while permitting rotation of said rotatable partition means within said pump housing.