Spur tube with alternate oppositely directed orifices

Claim 1

A HEAT EXCHANGER COMPRISING AN INLET HEADER; AN OUTLET HEADER; A PLURALITY OF ELONGATED CONDENSING TUBES CONNECTED IN FIXED RELATION TO AND IN FLUID COMMUNICATION AT ONE END WITH SAID OUTLET HEADER; A PLURALITY OF HEAT EXCHANGE FINS MOUNTED ON THE EXTERIOR SIDE OF SAID CONDENSING TUBES; A PLURALITY OF ELONGATED VAPOR DISTRIBUTOR TUBES EACH DISPOSED AT ONE END THEREOF IN FLUID COMMUNICATION WITH SAID INLET HEADER AND EACH EXTENDING WITHIN ONE OF SAID CONDENSING TUBES; EACH OF SAID DISTRIBUTOR TUES COMPRISING A PLURALITY OF ANNULAR PORTIONS WITHIN A CONDENSING TUBE INCLUDING A FIRST ANNULAR PORTION AND A SECOND ANNULAR PORTION; SAID FIRST ANNULAR PORTION BEING INTERPOSED LONGITUDINALLY BETWEEN SAID SECOND ANNULAR PORTION AND SAID ONE END OF SAID DISTRIBUTOR TUBE; FIRST MEANS FORMING ON EACH OF SAID FIRST AND SECOND ANNULAR PORTIONS OF THE DISTRIBUTOR TUBE THEREIN A FIRST ORIFICE ORIENTED IN A DIRECTION GENERALLY FOR FLOW TOWARD SAID ONE END OF SAID CONDENSING TUBE; AND SECOND MEANS FORMING ON EACH OF SAID FIRST AND SECOND ANNULAR PORTIONS OF THE DISTRIBUTOR TUBE THEREIN A SECOND ORIFICE ORIENTED IN A DIRECTION GENERALLY FOR FLOW TOWARD THAT END OF SAID CONDENSING TUBE WHICH IS REMOTE FROM SAID ONE END OF SAID CONDENSING TUBE, WHEREBY SAID FIRST ANNULAR PORTION MAY DISTRIBUTE VAPOR IN AN AMOUNT SUBSTANTIALLY EQUAL TO THE AMOUNT OF VAPOR DISTRIBUTED BY SAID SECOND ANNULAR PORTION IN SPITE OF VARIATIONS IN THE TOTAL AMOUNT OF VAPOR DISTRIBUTED BY SAID DISTRIBUTOR TUBE.