A water jet propelled water craft (600, fig.10) has a jet pump impeller (608) mounted in a jet tube (610) and driven by a water cooled engine (604). A heat exchanger 100 for the engine coolant is incorporated into the jet tube (610) and takes the form of a chamber 104 formed by an inner tube 106 disposed around, or forming part of, the jet tube (610); an outer tube (58, figs.6,8) surrounding, and spaced-apart from, the inner tube 106; and annular end walls 110, 112 closing off opposite ends of the chamber 104. The chamber 104 has an inlet 116 and an outlet 118 separated by a divider 120 causing the fluid to follow a generally circumferential flow path through the chamber 104. A fluid pickup 124 for a secondary coolant system comprises a through aperture 128 in the inner tube 106, a secondary outlet 132 and a conduit 130, which are disposed within the chamber 104 and are located wholly to one side 98 of the divider 120. The chamber 104 may contain baffles. The divider (220, fig.4) may be double-walled. The pick-up conduit may be formed by a U-shaped rib (332, fig.5).


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    Title :

    Water craft jet pump heat exchanger with secondary pickup


    Contributors:

    Publication date :

    2017-12-20


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    English


    Classification :

    IPC:    F01P Kühlung von Kraft- und Arbeitsmaschinen oder Kraftmaschinen allgemein , COOLING OF MACHINES OR ENGINES IN GENERAL / B63H Schiffsantrieb oder Steuerung der Schiffe , MARINE PROPULSION OR STEERING / F28D Wärmetauscher, soweit in keiner anderen Unterklasse vorgesehen, in denen die Wärmetauschmittel nicht in direkte Berührung miteinander kommen , HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT



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