Handheld portable hot air device

Abstract

A handheld, portable hot air device ( 1, 30 ) comprising an electrical heating element ( 31 ), a fan ( 33 ) for inducing an air stream to pass the heating element ( 31 ) and an accumulator ( 34 ) for powering the heating element ( 31 ) and the fan ( 33 ), and in that said heating element ( 1, 31 ) comprises a ceramic tube ( 35 ) having a rear end and a front end and in which rear end a wire circuit ( 41, 42 ) with at least one heating wire ( 32 ) enters and leaves the ceramic tube ( 35 ) and in that the heating wire ( 32 ) either protrudes out from the front end of the ceramic tube ( 35 ) or enters the front end of the ceramic tube ( 35 ) in a spiral formed shape and in that one heating wire ( 421 ) is wrapped around a central ceramic conduit ( 43 ) located in the center of the ceramic tube ( 35 ).

1 . A handheld, portable hot air device comprising an electrical heating element, a fan for inducing an air stream to pass the heating element and an accumulator for powering the heating element and the fan, wherein said heating element comprises a ceramic tube having a rear end and a front end, wherein a wire circuit with at least one heating wire enters and leaves the ceramic tube at the rear end, wherein the heating wire either protrudes out from the front end of the ceramic tube or enters the front end of the ceramic tube in a spiral formed shape and wherein a spiral formed heating wire is wrapped around a central ceramic conduit located in a center of the ceramic tube. 
     
     
         2 . The hot air device of  claim 1 , wherein the spiral formed heating wire is long enough to pass on an outside surface for a total length of the central ceramic conduit and wherein a return connection is placed inside the central ceramic conduit. 
     
     
         3 . The hot air device of  claim 2 , wherein the spiral formed heating wire is long enough to pass further six times outside the central ceramic conduit and inside the ceramic tube. 
     
     
         4 . The hot air device of  claim 1 , wherein said central ceramic conduit is cylindrical. 
     
     
         5 . The hot air device of  claim 1 , wherein said ceramic tube comprises longitudinal inner wire compartments enclosing said spiral formed heating wire. 
     
     
         6 . The hot air device of  claim 1 , wherein said ceramic tube comprises air indentations formed as grooves on an outside surface of the ceramic tube. 
     
     
         7 . The hot air device of  claim 1 , wherein said ceramic tube is divided into at least a front part and one or more rear parts wherein the front part consists of thicker ceramic material than the one or more rear parts. 
     
     
         8 . The hot air device of  claim 1 , wherein said ceramic tube is substantially cylindrical and wherein the central ceramic conduit is mounted at a center of the ceramic tube. 
     
     
         9 . The hot air device of  claim 1 , wherein said ceramic tube consists of a first aluminum composition of 60% and of a second aluminum composition of 40% wherein,
 the first composition consists of:
 99% aluminium oxide, 
 0.6% calcium oxide, 
 0.2% magnesium, 
 0.2% silicon oxide and wherein, 
   the second composition consists of:
 65% aluminium oxide, 
 15% talc, 
 10% kaolin, 
 10% magnesium carbonate. 
   
     
     
         10 . The hot air device of  claim 1 , wherein a resistant wire is attached to the electric heating element and transfers a part of a voltage from the accumulator into heat used to pre-heat air through the device. 
     
     
         11 . The hot air device of  claim 10 , wherein electric cables are mounted between said accumulator and said fan wherein at least one of the cables is provided with said resistant wire for reducing the voltage to the fan. 
     
     
         12 . The hot air device of  claim 1 , wherein the material composition of said heating wire consists of:
 5% nickel,   22% chrome,   65% iron, and   8% aluminium.   
     
     
         13 . The hot air device of  claim 1 , comprising an inlet air channel connected to the fan, wherein said inlet air channel is arranged in a vicinity of the accumulator such that air drawn through the inlet channel provides a heat exchanging relationship with the accumulator. 
     
     
         14 . The hot air device of  claim 13 , wherein the inlet air channel is located upstream of the accumulator to direct the air to be in direct contact with the accumulator. 
     
     
         15 . The hot air device of  claim 1 , wherein electrical components of the said device are configured to produce a temperature of hot air at the front end of the device to be in a range of 500-800° C., such that the hot air device is configured as a handheld electrical igniter for ignition of solid fuels such as charcoal. 
     
     
         16 . The hot air device of  claim 1 , wherein electrical components of the said device are configured to produce a temperature of hot air at the front end of the device to be in the range of 80-300° C., such that the hot air device is configured as a handheld hot air gun. 
     
     
         17 . The hot of  claim 1 , wherein electrical components of the said device are configured to produce a temperature of hot air at the front end of the device to be either in steps or continuously selectable at a specific temperature in the range of 20-90° C. such that the hot air device is configured as a handheld hairdryer. 
     
     
         18 . A method of manufacturing a ceramic conduit or a ceramic tube for a handheld, portable electrical hot air device, comprising:
 a) mixing the materials in the ceramic composition together,   b) placing the mixture in a mold,   c) treating the mold in a kiln in a first burning at 200-300° C. for 20-40 minutes, and   d) treating the mold is in a second burning at 1500-1700° C. for 20-40 minutes;   wherein the hot air device comprises an electrical heating element and a fan for inducing an air stream to pass the heating element, wherein said heating element comprises the ceramic tube, the ceramic conduit located in a center of the ceramic tube, and a spiral formed heating wire wrapped around the ceramic conduit.   
     
     
         19 . The method of  claim 18 , wherein treating the mold in a kiln in a first burning at 200-300° C. for 20-40 minutes comprises treating the mold in the kiln in the first burning at 250° C. for 30 minutes. 
     
     
         20 . The method of  claim 18 , wherein treating the mold in the second burning at 1500-1700° C. for 20-40 minutes comprises treating the mold in the second burning at 1600° C. for 30 minutes. 
     
     
         21 . A hot air device, comprising:
 an electrical heating element and a fan for inducing an air stream to pass the heating element,   an accumulator for powering the heating element and the fan, and   an Electronic Control Unit (ECU),   wherein said ECU is configured to provide a Normal Ignition Cycle in which the fan and the heating element are operating simultaneously during an Ignition Step which continues for a set time interval, and a Blowing Step in the Normal Ignition Cycle which follows after the Ignition Step, and   wherein said Blowing step includes setting an electrical effect of the heating element to be lower than in the ignition step while the fan is still operating.   
     
     
         22 . The hot air device of  claim 21 , wherein said ECU is configured to control the heating element to be switched off in the blowing step. 
     
     
         23 . The hot air device of  claim 21 , wherein said ECU is configured to control the fan to increase air flow during the blowing step. 
     
     
         24 . The hot air device of  claim 21 , wherein said ECU is configured to provide a Preheating Step preceding the Ignition Step, said Preheating Step including setting the fan at lower speed than in the Ignition Step or turning the fan off while the heating element is turned on. 
     
     
         25 . The hot air device of  claim 21 , wherein said ECU is configured to include an Energy Saving Ignition Cycle in which energy consumed by the heating element during an Ignition Step of the Energy Saving Ignition Cycle is lower than during the Ignition Step of the Normal Ignition Cycle. 
     
     
         26 . The hot air device of  claim 25 , wherein said ECU is configured to reduce the energy consumption of the heating element during the Ignition Step of the Energy Saving Ignition Cycle by approximately 50 percent compared to the Ignition Step of the Normal Ignition Cycle by reducing the time of the Ignition Step by approximately 50 percent or reducing a power effect by the heating element in watt by approximately 50 percent. 
     
     
         27 . The hot air device of  claim 21  wherein a total energy consumption for the Ignition Step is at least 5 times more than an energy consumption during the Blowing Step. 
     
     
         28 . The hot air device of  claim 21 , comprising an inlet air channel connected to the fan, wherein said inlet air channel is arranged in a vicinity of the accumulator such that air drawn through the inlet channel is in a heat exchanging relationship with the accumulator. 
     
     
         29 . The hot air device of  claim 28 , wherein the inlet air channel is configured to direct the air to be in direct contact with the accumulator.