Impeller, And Pump And Fluid Delivery Device Using The Impeller

Abstract

An impeller, and a pump and a fluid delivery device using the pump are disclosed. An impeller includes an base plate and a plurality of long blades and a plurality of short blades disposed on the base plate. The impeller further includes a shaft mounting portion disposed on the base plate. The plurality of long blades and the plurality of short blades are alternatively arranged on the base plate and surround the shaft mounting portion. The long blades and the short blades are all arcuate blades. The above fluid delivery device, the pump and the impeller have improved efficiency.

1 . An impeller comprising:
 an base plate;   a shaft mounting portion disposed on the base plate,   a plurality of long blades and a plurality of short blades disposed on a side of the base plate, the plurality of long blades and the plurality of short blades being alternatively arranged on the base plate along a circumferential direction of the base plate, and surrounding the shaft mounting portion, the long blades and the short blades being all arcuate blades.   
     
     
         2 . The impeller of  claim 1 , wherein the shaft mounting portion is a circular cylinder protruding from the base plate. 
     
     
         3 . The impeller of  claim 1 , wherein each the long blade extend along radial directions of the base plate, each long blade has a terminating end adjacent to the radial rim of the base plate and a start end of each long blade relatively closed to the shaft mounting portion comparing to the terminating end of the long blade, a ratio of a distance between a start end of each long blade and an outer circumferential surface of the shaft mounting portion, to a diameter of the base plate is greater than or equal to 0.219, and less than or equal to 0.4, and/or, a ratio of a distance between a start position of each of the short blades and the start position of one adjacent long blade, to the diameter of the base plate is greater than or equal to 0.219, and less than or equal to 0.4. 
     
     
         4 . The impeller of  claim 3 , wherein the long blades are spaced from each other at uniform intervals, the short blades are spaced from each other at uniform intervals, and distances between a start end of each short blade and start ends of two long blades neighboring the short blade are the same. 
     
     
         5 . The impeller of any of  claims 1 , wherein the base plate defines a plurality of balance holes in the base plate. 
     
     
         6 . The impeller of  claim 5 , wherein the balance holes uniformly distributed on the base plate. 
     
     
         7 . The impeller of  claim 6 , wherein centers of the balance holes are located on a same circle, and a ratio of a diameter of the circle to a diameter of the base plate is greater than or equal to 0.36, and less than or equal to 0.9;
 and/or, a cross section area of each balance hole is greater than or equal to 9 mm 2 , and less than or equal to 240 mm 2 ;   and/or, each balance hole has at least one of the following shapes: round, square, triangle, and rectangle.   
     
     
         8 . The impeller of any of  claims 1 , wherein the shaft mounting portion is connected to the base plate with a smooth transition therebetween. 
     
     
         9 . A pump comprising:
 a driving mechanism; and   an impeller connected to the driving mechanism, the driving mechanism being configured to drive the impeller to rotate, the impeller comprising:
 an base plate; 
 a shaft mounting portion disposed on the base plate; and 
 a plurality of long blades and a plurality of short blades disposed on the base plate, the plurality of long blades and the plurality of short blades being alternatively arranged on the base plate along a circumferential direction of the base plate, and surrounding the shaft mounting portion, the long blades and the short blades being all arcuate blades. 
   
     
     
         10 . The pump of  claim 9 , wherein the pump further includes a pump housing, the pump housing includes a main body and a cover disposed on the main body, the main body includes a volute-shaped receiving portion and a flow guide portion ( 343 ) connected to the receiving portion, the driving mechanism is mounted to the cover, and the receiving portion defines a receiving chamber accommodating the impeller. 
     
     
         11 . The pump of  claim 10 , wherein the profile of the receiving chamber of the receiving portion is a spiral line substantially formed by a plurality of arc segments approximated, a ratio of a diameter D 1  to a diameter D 2  is greater than or equal to 1.05, and less than or equal to 1.1, wherein D 1  is a diameter of one of the arc segments, at which the starting point of the spiral line is located, D 2  is a diameter of the base plate;
 and/or, a ratio of an outlet flow area of the receiving portion to an outlet flow area of the impeller is greater than or equal to 0.2, and less than or equal to 0.5; 
 and/or, a ratio of a distance between the impeller and a bottom wall of the receiving portion of the main body to the diameter of the base plate is greater than or equal to 0.04, and less than or equal to 0.12. 
 
     
     
         12 . The pump of  claim 10 , wherein the flow guide portion defines an outlet passage communicating with the receiving chamber of the receiving portion, and a diameter of the outlet passage increases progressively in a direction away from the receiving portion;
 and/or, the pump housing further includes an inlet pipe, the inlet pipe is disposed at one side of the receiving portion opposite from the cover, and an inner chamber of the inlet pipe is in communication with the receiving chamber of the receiving portion.   
     
     
         13 . The pump of  claim 10 , wherein the cover includes a mounting portion and a cover portion disposed on the mounting portion, the cover portion covers on the main body, and the driving mechanism is mounted in the mounting portion. 
     
     
         14 . The pump of  claim 13 , wherein the pump further comprises a mounting base, and the mounting portion of the cover is fixedly disposed on the mounting base. 
     
     
         15 . The pump of  claim 14 , wherein the mounting base includes a base body and a retaining portion disposed on the base body, the retaining portion includes two opposed claws, and the mounting portion is retained between the two claws. 
     
     
         16 . The pump of  claim 10 , wherein the driving mechanism is a single phase motor. 
     
     
         17 . A fluid delivery device comprising:
 a driving mechanism; and   an impeller connected to the driving mechanism, the driving mechanism being configured to drive the impeller to rotate, the impeller comprising:
 an base plate; 
 a shaft mounting portion disposed on the base plate; and 
 a plurality of long blades and a plurality of short blades disposed on the base plate, the plurality of long blades and the plurality of short blades being alternatively arranged on the base plate and surrounding the shaft mounting portion, the long blades and the short blades being all arcuate blades.