Blower

Abstract

A blower includes a body, a motor, and a single fan configured to rotate in response to rotation of a motor shaft to discharge air through a discharge opening. The maximum rotational speed of the motor shaft is within a range of 50,000 rpm to 120,000 rpm. An area of the discharge opening is changeable by a user. The blower is configured to selectively operate in a first mode or in a second mode according to the area of the discharge opening. In the first mode, the maximum blowing force of the air discharged through the opening is within a range of 2.5 N to 5.0 N when the motor is driven at the maximum rotational speed. In the second mode, the maximum dynamic pressure of the air discharged is within a range of 30 kPa to 65 kPa when the motor is driven at the maximum rotational speed.

What is claimed is: 
     
         1 . An air duster configured to discharge compressed air for blowing off dust and the like, the air duster comprising:
 a body having an inlet opening and a discharge opening;   a motor assembly housed in the body; and   a handle configured to be held by a user,   wherein:   the motor assembly comprises:
 a case that has a first opening and a second opening; 
 a motor that includes (i) a stator supported within the case, (ii) a rotor and (iii) a motor shaft configured to rotate integrally with the rotor around a rotational axis that defines a front-rear direction of the air duster; 
 a fan that is fixed to the motor shaft within the case and is configured to rotate integrally with the motor shaft; and 
 at least one bearing that is supported within the case and rotatably supports the motor shaft; 
   the body and the motor assembly are connected to be movable relative to each other by at least one elastic member disposed between the body and the motor assembly; and   the handle is formed integrally with the body, protruding from a portion of the body that houses the motor assembly, and extending in a direction intersecting the rotational axis.   
     
     
         2 . The air duster as defined in  claim 1 , wherein the motor assembly includes a circuit board on which a circuit configured to control energizing of the motor is mounted. 
     
     
         3 . The air duster as defined in  claim 2 , wherein the at least one elastic member includes a first elastic member disposed rearward of the motor in the front-rear direction and a second elastic member disposed forward of the motor in the front-rear direction. 
     
     
         4 . The air duster as defined in  claim 3 , wherein:
 the motor assembly includes a support member fixed to the case;   the support member supporting, at a position in front of the second opening of the case, the circuit board and the second elastic member; and   air that has flowed out through the second opening flows toward the discharge opening through a space, formed in a radial direction with respect to the rotational axis, between an inner peripheral surface of the body and the motor assembly.   
     
     
         5 . The air duster as defined in  claim 1 , wherein the at least one elastic member includes a first elastic member disposed rearward of the motor in the front-rear direction and a second elastic member disposed forward of the motor in the front-rear direction. 
     
     
         6 . The air duster as defined in  claim 5 , wherein one of the first elastic member and the second elastic member is configured to partition a space formed between the body and the motor assembly into (i) a first space communicating with the inlet opening and the first opening and (ii) a second space communicating with the second opening and the discharge opening. 
     
     
         7 . The air duster as defined in  claim 6 , wherein the second elastic member is disposed in the second space. 
     
     
         8 . The air duster as defined in  claim 5 , wherein the first elastic member is formed in a short cylindrical shape and is fitted to the case at a position rearward of the motor so as to close a gap between the case and the body. 
     
     
         9 . The air duster as defined in  claim 8 , wherein the first elastic member is fitted to a rear end portion of the case so as to close the gap between the case and the body. 
     
     
         10 . The air duster as defined in  claim 5 , wherein the second elastic member is configured to restrict relative rotation between the motor assembly and the body in a circumferential direction around the rotational axis of the motor shaft. 
     
     
         11 . The air duster as defined in  claim 10 , wherein the second elastic member is fitted in a recess provided in the body. 
     
     
         12 . The air duster as defined in  claim 1 , wherein the motor assembly and the body are connected to be movable relative to each other in all directions by at least one elastic body. 
     
     
         13 . The air duster as defined in  claim 3 , wherein the first elastic member is disposed between a rear end portion of the case and the body in a radial direction with respect to the rotational axis. 
     
     
         14 . The air duster as defined in  claim 4 , wherein the second elastic member is supported by the support member at a position in front of the second opening of the case and is disposed between the support member and the body in the radial direction. 
     
     
         15 . An air duster configured to discharge compressed air for blowing off dust and the like, the air duster comprising:
 a body having an inlet opening and a discharge opening;   a motor assembly housed in the body; and   a handle configured to be held by a user,   wherein:   the motor assembly comprises:
 a case that has a first opening and a second opening; 
 a motor that includes (i) a stator supported within the case, (ii) a rotor and (iii) a motor shaft configured to rotate integrally with the rotor around a rotational axis that defines a front-rear direction of the air duster; 
 a fan that is fixed to the motor shaft within the case and is configured to rotate integrally with the motor shaft; 
 at least one bearing that is supported within the case and rotatably supports the motor shaft; and 
 a circuit board on which a circuit configured to control energizing of the motor is mounted; 
   the body and the motor assembly are connected to be movable relative to each other by at least one elastic member disposed between the body and the motor assembly;   the at least one elastic member includes a first elastic member disposed rearward of the motor in the front-rear direction and a second elastic member disposed forward of the motor in the front-rear direction; and   the handle is formed integrally with the body, protruding from a portion of the body that houses the motor assembly, and extending in a direction intersecting the rotational axis.