Energy-saving electrothermal blower and a manufacture method of the electrothermal element thereof

Abstract

An energy saving electric heating fan and the making method of its electric heating element are disclosed. The electric heating fan includes a blower and a motor driving the blower in a case ( 1 ), an insulation base board with some electric heating elements ( 2 ) in the case ( 1 ), and a connection electric heating elements ( 2 ) with a electric circuit for connecting the power supply. The electric heating elements ( 2 ) are heating bodies prepared by steps: coating or screen printing a thin layer of high strength glue with high temperature resistant on a mica base material, then coating or screen printing a layer of heating film with electrodes. The adhesive agent of the heating film of the heating bodies is prepared by steps: sintering the main material of silicon oxide, alumina, silicon carbide, calcium, kalium at high temperature and high pressure, smashing and filtrating to produce powder, then mixing with a high temperature resistant organic adhesive agent with the expansion coefficient equal to mica.

1 . An energy-saving electrothermal blower including a shell ( 1 ) with an inlet and outlet ( 4 ), a fan and a motor for driving it fixed in the shell ( 1 ); an insulating plate with an electrothermal element in the shell; and a connecting circuit for connection of the electrothermal element with a power supply, characterized in that mica is used as a base material of the electrothermal element ( 2 ) and is coated or screen printed with a thin layer of high temperature resistant strong glue as a connection layer, and then coated or screen printed with a layer of heating film and an electrode. 
   
   
       2 . The energy-saving electrothermal blower according to  claim 1 , characterized in that the main raw material of a slurry of the heating film includes one or more of silicon oxide, alumina, silicon carbide, calcium, and potassium; and the slurry is made by said main raw material, which is sintered at a high temperature and then broken into pieces and screened to powder and then mixed with a high temperature resistant organic glue slurry having an expansion coefficient which is the same as an expansion coefficient as the mica. 
   
   
       3 . The energy-saving electrothermal blower according to  claim 1 , characterized in that wire of said electrothermal element is fixed on an electrode film ( 3 ) by a first conducting clip ( 7 ); one end of the electrode film is connected with a temperature controller ( 8 ), a fuse ( 9 ) and a power switch in series; and another end thereof is fixed on another pole of the power switch by a second conducting clip ( 7 ) to form an electrical circuit. 
   
   
       4 . The energy-saving electrothermal blower according to any of  claim 1 ,  2  or  3 , characterized in that the electrothermal element ( 2 ) is a cross or star in shape. 
   
   
       5 . The energy-saving electrothermal blower according to any of  claim 1 ,  2  or  3 , characterized in that the electrothermal element ( 2 ) is a grid in shape. 
   
   
       6 . The energy-saving electrothermal blower according to any of  claim 1 ,  2  or  3 , characterized in that the electrothermal element ( 2 ) is a triangle or a diamond in shape. 
   
   
       7 . The energy-saving electrothermal blower according to any of  claim 1 ,  2  or  3 , characterized in that the outlet of the blower is one of a square, a rectangle, an ellipse, a circle, a taper or a triangle in shape. 
   
   
       8 . The energy-saving electrothermal blower according to any of  claim 1 ,  2  or  3 , characterized in that a total thickness of the heating film and mica is less than 1 mm. 
   
   
       9 . A method for manufacturing an electrothermal element of an energy-saving electrothermal blower, comprising:
 a. screen printing or coating on each surface of a mica lamination a thin layer of high temperature resistant strong glue and then drying same;   b. screen printing or coating on a surface of the mica lamination a slurry of heating film prepared according to desirable power and temperature with a layer of high temperature resistant strong glue and then drying same;   c. screen printing on both ends of the heating film a silver electrode film with a regulated ratio and then drying same to form the heating element.   
   
   
       10 . The method for manufacturing the electrothermal element of the energy-saving electrothermal blower according to  claim 9 , characterized in that: a main raw material of the slurry of the heating film includes one or more of silicon oxide, alumina, silicon carbide, calcium, and potassium; the slurry being made by said main raw material, which is sintered at a high temperature and then broken into pieces and screened to powder and then mixed with a high temperature resistant organic glue slurry having an expansion coefficient which is the same as an expansion coefficient as the mica; and the drying in steps a, b and c is carried out at 300° C.