Standalone portable electric blower with variable air exit speed

Abstract

A standalone portable electric blower has a propeller generating airflow and driven by an electric motor powered: by a power source, said blower including an air-guide conduit made up of a series of three generally cylindrical tubular portions, namely a proximal portion or suction nozzle provided with an air inlet, a distal air exit portion or exhaust nozzle and a central portion. The central portion is a separate piece and is arranged to form a functional assembly, unitary or made up of a plurality of elements and made of a heat conducting material, said central portion comprising the following functional sub-assemblies; an electronic switching electric motor; at least one axial, propeller rotated b the electric motor; air rectifiers; and an electronic board for managing the tool and controlling the motor. The functional assembly is housed in the central or intermediate portion of said air-guide conduit with which said assembly engages,

1 . Stand-alone portable electric blower, featuring at least one propeller generating an an flow and driven by an electric motor powered by a current source, said blower comprising an air-guide conduit consisting of three successive tubular parts of a general cylindrical shape, namely a proximal part or suction nozzle ti provided with an in inlet, a distal air outlet part or exhaust pipe and a central or intermediary part, characterized in that the central pan is a separate piece and is fitted to constitute a functional assembly solid bloc or formed by an assembly of a number of elements and made of a good heat-conducting material, said central part featuring the following functional sub-assemblies housed in said central part of said air-guide conduit:
 an electric motor with electronic switching;   at least one axial propeller driven in rotation by the electric motor and constituting, together with the latter, an axial fan;   air an rectifiers;   an electronic board for tool management and motor control, said functional assembly being housed in the central or intermediary pan of said air-guide conduit with which it is in contact.   
     
     
         2 . Portable electric blower according to  claim 1 , characterized in that the functional assembly features also the following functional sub-assemblies:
 an aerodynamic air inlet cone positioned coaxially upstream oldie propeller; and/or   an aerodynamic air outlet cone positioned coaxially downstream of the electric motor.   
     
     
         3 . Blower according to  claim 1 , characterized in that the central functional assembly comprises a passageway located primarily in the air current and housing the electric cable(s) connecting the electronic board and the electric motor. 
     
     
         4 . Portable electric blower according to  claim 1 , characterized in that said suction nozzle presents, upstream of the axial fan, an elbow the proximal end of which demarcating the air inlet is directed downward, considering a work position of the blower according to which it is directed forward and the control handle of the blower is placed on top of it. 
     
     
         5 . Portable electric blower according to  claim 4 , characterized in that the control handle of the blower is placed above the central part enclosing the functional assembly, considering a work position of the blower according to which it is directed forward. 
     
     
         6 . Portable electric blower according to  claim 4 , characterized in that the control handle of the blower is placed essentially above the center of gravity G of the tool. 
     
     
         7 . Portable electric blower according to  claim 1 , characterized in that the functional assembly comprises, on the one hand, an exterior housing of a general cylindrical shape, an interior cylindrical housing of a smaller diameter and positioned axially in said exterior housing, said exterior and interior housings being connected by radial ribs or rectifiers demarcating a number of cooling air circulation channels positioned between said housings and extending in parallel to the axis of the tatter and, on the other hand, an axial fan, the propeller of which is driven in rotation by an electric motor housed in the interior housing, characterized in that the exterior housing, the interior housing and the rectifiers connecting said housings are made of a single piece of a good beat-conducting material. 
     
     
         8 . Portable electric blower according to  claim 7 , characterized in that the exterior housing features a plate or base in contact with said exterior housing on which is fastened, an electronic board for the purpose of providing management of the tool and the control of the motor. 
     
     
         9 . Portable electric blower according to  claim 8 , characterized in that the plate holding the electronic board is made of a single piece with the assembly constituted by the exterior housing, the interior housing and the rectifiers. 
     
     
         10 . Portable electric blower according to  claim 7 , characterized in that the blades of the axial propeller and the radial rectifying ribs are curved in the opposite direction. 
     
     
         11 . Portable electric blower according to  claim 7 , characterized in that the rectifiers and the air circulation channels demarcated by these rectifiers are of a length essentially equal to the length of the interior housing enclosing the motor of the axial fan. 
     
     
         12 . Portable electric blower according to  claim 7 , characterized in that the solid bloc assembly constituted by the exterior housing, the interior housing, the rectifiers and the plate is made of magnesium, aluminum, or of a composite material or of plastic material possessing good thermal conductivity properties. 
     
     
         13 . Portable electric blower according to  claim 7 , characterized in that the assembly constituted by the exterior housing, the interior housing, the rectifiers and the plate or base is obtained from a single piece by a molding process or by a precision injection process. 
     
     
         14 . Portable electric blower according to  claim 5 , characterized in that the handle is provided with a secondary electronic board connected to the electronic board for tool management and motor control. 
     
     
         15 . Portable electric blower according to  claim 14 , featuring a trigger controlling the operation and stopping of the tool, characterized in that the secondary electronic board is configured to analyze the position of the trigger. 
     
     
         16 . Portable electric blower according to  claim 15 , characterized in that the measuring of the position of the trigger uses a field-oriented magnet and a magneto-resistive sensor. 
     
     
         17 . Portable electric blower according to  claim 14 , characterized in that the secondary electronic board features a speed selector and a display device of the selected speed. 
     
     
         18 . Portable electric blower according to  claim 17 , characterized in that the speed selector comprises a Hall-effect sensor present on the secondary electronic board and a magnet fastened on the push-button or other control element of this speed selector. 
     
     
         19 . Portable electric blower according to  claim 5 , characterized in that the handle is constituted by the assembly of two half shells. 
     
     
         20 . Portable electric blower according to  claim 19 , characterized in that the fastening of the assembly of the three proximal, central, and distal parts constituting the conduit is provided by the assembly of the two half shells. 
     
     
         21 . Portable electric blower according to  claim 1 , characterized in that it features a power cable connecting the electronic board for tool management and motor control to the battery, and in that the electric cord features a quick connect/disconnect connector on the tool. 
     
     
         22 . Portable electric blower according to  claim 1 , characterized in that its power supply is provided by a high capacity battery carried by the operator. 
     
     
         23 . Portable electric blower according to  claim 22 , characterized, in that the battery is a lithium-ion or lithium-polymer battery.