Blower

Abstract

A blower includes an upper housing and a lower housing. An air flow space and an air outlet passage are formed inside and communicate with each other. A fan is mounted in the upper housing and the lower housing. A driving shaft of a motor passes through the lower housing and is connected to the fan. The upper housing has a first annular rib with an arc-shaped surface at an edge of the air inlet opening. The upper housing has a second annular rib protruding on an inner bottom surface of the upper housing and adjacent to the air inlet opening. When an external fluid flows in the air inlet opening, the fluid can smoothly pass through the arc-shaped surface of the first annular rib. A part of the fluid is blocked by the second annular rib, and thus forms a vertical downward airflow curtain.

1 . A blower comprising:
 an upper housing having:
 an air inlet opening in a center of the upper housing; and 
 a first rib around a periphery of the air inlet opening; 
 a lower housing connected to the upper housing and forming a casing, the casing being hollow and cylindrical and forming: 
 an airflow space inside the casing; and 
 an outlet passage connected to the airflow space; 
 a fan located between the upper housing and lower housing and forming: 
 an air inlet hole corresponding to the air inlet opening of the upper housing in location; and 
 multiple channels, one end of each one of the channels connected to the airflow space and another end of the channel connected to the airflow space of the casing; and 
 a motor mounted out of the lower housing and having: 
 a driving shaft, one end of the driving shaft mounted through the lower housing, extending into the airflow space, and fixed on the fan. 
   
     
     
         2 . The blower as claimed in  claim 1  further including:
 a second annular rib protruding from an inner bottom surface of the upper housing and adjacent to the air inlet opening, the second annular rib including:
 an outer peripheral surface and an inner peripheral surface adjacent to the first annular rib, a diameter of the first annular rib being smaller than that of the second annular rib, and the first annular rib and the second annular rib arranged in concentric circles; 
 
 wherein a portion of the upper housing located between the first annular rib and the second annular rib forms:
 an annular recess on an inner and bottom surface thereof and concaved upward, an edge of the air inlet opening corresponding to the annular recess. 
 
 
     
     
         3 . The blower as claimed in  claim 2 , wherein a cross-sectional shape of the first annular rib and a cross-sectional shape of the second annular rib are arc-shaped. 
     
     
         4 . The blower as claimed in  claim 2 , wherein an angle between the inner bottom surface of the upper housing and the outer peripheral surface of the second annular rib is 70 to 90 degrees. 
     
     
         5 . The blower as claimed in  claim 3 , wherein an angle between the inner bottom surface of the upper housing and the outer peripheral surface of the second annular rib is 70 to 90 degrees. 
     
     
         6 . The blower as claimed in  claim 1 ,
 wherein the fan comprises:
 an upper plate, a lower plate, and multiple blades located between the upper plate and the lower plate; the flow paths formed between two of the blades; 
 an inner annular rib formed on an edge of the air inlet hole and located above the upper plate; 
 an outer annular rib formed on an outer peripheral surface; and 
 a middle annular rib formed between the inner annular rib and the outer annular rib; 
 wherein the inner annular rib, the middle annular rib, and the outer annular rib arranged in concentric circles. 
   
     
     
         7 . The blower as claimed in  claim 5 , wherein the fan comprises:
 an upper plate, a lower plate, and multiple blades located between the upper plate and the lower plate; the flow paths formed between two of the blades;   an inner annular rib formed on an edge of the air inlet hole and located above the upper plate;   an outer annular rib formed on an outer peripheral surface; and   a middle annular rib formed between the inner annular rib and the outer annular rib;   wherein the inner annular rib, the middle annular rib, and the outer annular rib arranged in concentric circles.