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FLUID PUMP FOR DELIVERING COOLED WORKING FLUID IN AN ENGINE COOLING SYSTEM

  • US 20110110801A1
  • Filed: 11/09/2009
  • Published: 05/12/2011
  • Est. Priority Date: 11/09/2009
  • Status: Abandoned Application
First Claim
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1. A fluid pump for delivering cooled working fluid in an engine cooling system, said fluid pump comprising:

  • a housing unit defining an accommodation chamber which extends along a central axis, and having a partition wall which extends radially to watertightly separate said accommodation chamber into front and rear chambers, said rear chamber having a rear peripheral wall which surrounds the central axis, and a rear mount wall which extends radially and which has an internal duct that extends therethrough along the central axis, said front chamber having a central region and a surrounding region that are disposed radially opposite to each other;

    an inlet which is disposed forwardly of said front chamber and upstream of said central region;

    an outlet which is disposed downstream of said surrounding region;

    a canister member disposed in said rear chamber, and configured to watertightly separate said rear chamber into stator-side and rotor-side spaces, said canister member includinga front tubular end which is secured to said partition wall, anda rear end wall which extends radially to interrupt fluid communication between said stator-side space and said internal duct, and which has an entry duct that extends along the central axis to be in fluid communication with said internal duct;

    a stator which is disposed in said stator-side space;

    a hollow shaft which is disposed in said rotor-side space and which has an output spindle that extends into said central region, said hollow shaft defining a passage which extends along the central axis to communicate said internal duct with said central region;

    a rotor which is mounted in said rotor-side space to rotate said outer spindle about the central axis;

    an impeller which is mounted in said central region to be rotated with said output spindle, and which is configured to compel the cooled working fluid introduced through said inlet to flow towards said surrounding region and out through said outlet when said impeller is rotated with said output spindle; and

    an auxiliary conduit which has an in-flow port that is disposed upstream of said central region and downstream of said inlet, and which extends to be in fluid communication with said internal duct so as to divert part of the introduced cooled working fluid to directly flow through said internal duct and said passage and out of said output spindle, thereby diffusing heat that is generated as a result of rotation of said rotor.

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