Hair dryer with air outlet arrangement

Abstract

The present invention relates to a hair dryer ( 100 ) and a nozzle ( 113, 310, 410 ) for a hair dryer ( 100 ), and more specifically to an air outlet arrangement ( 112, 220, 300, 400, 500, 600, 700 ). The air outlet arrangement ( 112, 220, 300, 400, 500, 600, 700 ) comprises a flow changing device ( 223, 224, 331, 341, 431, 531, 631, 632 ) for changing a flow of air at the air outlet arrangement ( 112, 220, 300, 400, 500, 600, 700 ), depending on a pressure and/or temperature within a housing ( 110 ), in particular within the nozzle ( 113, 310, 410 ).

1 . An electrical hair dryer comprising
 a housing with an air inlet and an air outlet arrangement,   a fan for generating a flow of air from the air inlet to the air outlet arrangement,   a heating element for heating the flow of air,   
       wherein the air outlet arrangement comprises a flow changing device for changing a flow of air at the air outlet arrangement depending on a pressure (P 1 , P 2 ) within the housing. 
     
     
         2 . The hair dryer according to  claim 1 ,
 wherein an effective cross section of the air outlet arrangement for letting out air depends on the pressure (P 1 , P 2 ) within the housing.   
     
     
         3 . The hair dryer according to  claim 2 ,
 wherein above a pressure (P 1 , P 2 ) threshold threshold the effective cross section is automatically increased.   
     
     
         4 . The hair dryer according to  claim 1 ,
 wherein the flow changing device comprises a mechanical shutter.   
     
     
         5 . The hair dryer according to  claim 4 ,
 wherein the flow changing device further comprises a spring element for exerting a closing force (F S1 , F S2 ) on the mechanical shutter that counteracts an opening force (F P1 , F P2 ) on the mechanical shutter, which opening force (F S1 , F S2 ) is caused by the pressure (P 1 , P 2 ) within the housing.   
     
     
         6 . The hair dryer according to  claim 4 ,
 wherein the flow changing device further comprises a thermo actuator for operating the mechanical shutter wherein said thermo actuator is adapted to change its form depending on the temperature (T 1 , T 2 ).   
     
     
         7 . The hair dryer according to  claim 1 ,
 further comprising a pressure sensor and an electro-mechanical actuator ( 713 ) for operating the flow changing device.   
     
     
         8 . The hair dryer according to  claim 1 ,
 wherein the air outlet arrangement comprises a main air outlet and a bypass air outlet.   
     
     
         9 . The hair dryer according to  claim 8 ,
 wherein the bypass air outlet is adapted to act as a safety valve.   
     
     
         10 . The hair dryer according to  claim 4 ,
 wherein the mechanical shutter is adapted to operate a bypass air outlet.   
     
     
         11 . The hair dryer according to  claim 8 ,
 wherein the bypass air outlet is configured to guide heated air substantially in direction of the main air outlet.   
     
     
         12 . The hair dryer according to  claim 8 ,
 wherein the heating element and/or the fan is configured such that an air temperature of the flow of air is limited to a maximum value, when the flow of air exits through the bypass air outlet only.   
     
     
         13 . The hair dryer according to  claim 1 ,
 wherein a direction of letting air out of the air outlet arrangement depends on the pressure (P 1 , P 2 ) within the housing.   
     
     
         14 . The hair dryer according to  claim 1 ,
 wherein the flow changing device further comprises a fixation device for fixing the flow changing device in a desired position.   
     
     
         15 . A nozzle for a hair dryer, wherein the nozzle comprises an air outlet arrangement,
 Wherein the air outlet arrangement comprises a flow changing device for changing a flow of air at the air outlet arrangement depending on a pressure (P 1 , P 2 ) and/or temperature (T 1 , T 2 ) within the housing.