Water Pump

Abstract

A water pump including an upper casing and a lower casing that are formed with an inlet into which fluid is introduced and an outlet through which the fluid is discharged; and an impeller that is accommodated inside, formed by the coupling of the upper casing and the lower casing. The impeller is formed with a down force generation part that generates a force that pushes the impeller downward by coming into contact with fluid within a flow path through which the fluid passes and the down force generation part is formed such that a height of an ending point (E) is higher than a height of a starting point(S).

What is claimed is: 
     
         1 . A water pump, comprising:
 an upper casing and a lower casing that are coupled to each other to form an impeller accommodation space in which an impeller is rotatably accommodated, and have an inlet formed above the impeller accommodation space to communicate with the impeller accommodation space and to allow fluid to flow in, a discharge channel formed radially outside the impeller accommodation space to communicate with the impeller accommodation space, and an outlet connected to the discharge channel to discharge the fluid to an outside; and   an impeller that is rotatably provided in the impeller accommodation space,   wherein the impeller is formed with a down force generation part that generates a force that pushes the impeller downward by coming into contact with fluid within a flow path through which the fluid passes, and   the down force generation part is formed such that a height of an ending point (E) is higher than a height of a starting point(S).   
     
     
         2 . The water pump of  claim 1 , wherein the impeller is a centrifugal impeller, and
 a fluid discharge angle (θ 1 ) formed by a fluid discharge direction in which the fluid is discharged from the impeller with respect to a fluid inlet direction in which fluid is introduced from the upper casing toward the impeller is less than 90°.   
     
     
         3 . The water pump of  claim 1 , wherein the fluid inlet direction, in which the fluid is introduced from the upper casing toward the impeller, is a direction parallel to a rotational center axis of the impeller. 
     
     
         4 . The water pump of  claim 1 , wherein the impeller comprises an upper plate and a lower plate disposed spaced apart from each other vertically, and a plurality of blades disposed spaced apart from each other along a circumferential direction and coupled to the upper plate and the lower plate, and
 a through hole is formed in a radially central portion of the upper plate to allow the fluid to be introduced through both upper and lower surfaces, and the fluid is discharged from radially outer ends of the plurality of blades.   
     
     
         5 . The water pump of  claim 4 , wherein the down force generation part is formed in a form in which an upper surface of the lower plate is curved or bent outwardly and upwardly. 
     
     
         6 . The water pump of  claim 4 , wherein the down force generation part comprises all portions in which the radially outer surfaces of the lower plate, the plurality of blades, and the upper plate are all curved or bent outwardly and upwardly. 
     
     
         7 . The water pump of  claim 4 , wherein the down force generation part is formed between a fluid inlet side, which is a radially inner side, and a fluid discharge side, which is a radially outer side, of the impeller. 
     
     
         8 . The water pump of  claim 7 , wherein the impeller is formed at a constant height from the ending point of the down force generating part (E) to the radially outer end. 
     
     
         9 . The water pump of  claim 1 , wherein the upper casing has an upper flow path groove formed radially on the outer side of the impeller accommodation space and communicating with the impeller accommodation space,
 the lower casing has a lower flow path groove formed radially on the outer side of the impeller accommodation space and communicating with the impeller accommodation space, and   the upper flow path groove and the lower flow path groove together form the discharge channel.   
     
     
         10 . The water pump of  claim 1 , wherein the lower casing is formed with a rotor accommodation part that has a rotor accommodation space recessed downward from the upper surface at the central portion and protrudes downward, and the water pump further comprises: a rotor that is provided in the rotor accommodation part and coupled to an impeller;
 a motor housing that is coupled to the lower casing; and   a stator that is provided inside the motor housing and has the rotor accommodation part of the lower casing inserted into the central portion.