Fluid pump

Abstract

A fluid pump includes a housing, an intake port, a discharge port, a fluid chamber, a rotation shaft, an impeller supported by the rotation shaft so as to be rotatable in order to discharge fluid, the impeller includes a supported plate, plural blade portions provided at the impeller so as to be erected on a surface of the supported plate, a first inner end formed on each of the blade portions at a radially inner end thereof, plural notch portions formed on the supported plate of the impeller so as to be recessed inwardly, a second inner end formed on each of the notch portions at a radially inner end thereof and located at least radially outward relative to the first inner end and the notch portion provided at front of the blade portion in a rotation direction of the impeller.

1 . A fluid pump comprising 
 a housing;    an intake port provided at the housing;    a discharge port provided at the housing;    a fluid chamber provided inside the housing so as to connect to the intake port and the discharge port;    a rotation shaft provided inside the housing;    an impeller provided inside the fluid chamber and supported by the rotation shaft so as to be rotatable in order to discharge fluid by means of the rotation of the impeller from the discharge port which is provided radially outside of the impeller;    a supported plate provided at the impeller and supported by the rotation shaft so as to be rotatable along a backside wall of the fluid chamber;    plural blade portions provided at the impeller so as to be erected on a surface of the supported plate in the opposite side of the backside wall in a manner where it extends in a radial direction of the supported plate;    a first inner end formed on each of the blade portions at a radially inner end thereof;    plural notch portions formed on the supported plate of the impeller so as to be recessed inwardly from a radially outer end of the supported plate;    a second inner end formed on each of the notch portions at a radially inner end thereof;    the second inner end being located at least radially outward relative to the first inner end; and    the notch portion provided at front of the blade portion in a rotation direction of the impeller.    
   
   
       2 . The fluid pump according to  claim 1 , wherein each notch portion is formed at an area, which is located front of the blade portion in a rotation direction of the impeller, so as to abut on the blade portion.  
   
   
       3 . The fluid pump according to  claim 1 , wherein a length of the notch portion in a circumferential direction of the impeller is set in a manner where it becomes larger as it is located radially outward.  
   
   
       4 . The fluid pump according to  claim 1 , wherein the second inner end is located radially inward relative to a central position of the blade portion in a radial direction thereof.