Induced draft fan

Abstract

An induced draft fan, including: a fan housing, a wind wheel, and an ECM motor including a motor body and a motor controller. The motor controller is a control board that is not enclosed in a control box. The control board includes a microprocessor unit, an IGBT switch and a drive unit thereof, a detection unit for detecting operating parameters of the motor, and a DIP switch unit. The detection unit transmits operating parameters of the motor to the microprocessor unit. The microprocessor unit outputs a signal to control the IGBT switch and the drive unit thereof. An output end of the IGBT switch and the drive unit thereof is connected to the coil winding of the stator. An output end of the DIP switch unit is connected to an input end of the microprocessor unit.

The invention claimed is: 
     
         1 . An induced draft fan, comprising:
 a) a fan housing, the fan housing comprising a surface;   b) a wind wheel; and   c) an ECM motor, the ECM motor comprising a motor body and a motor controller;
 the motor body comprising: a stator, a rotor, and a casing; the stator comprising a coil winding; the rotor comprising a rotor shaft comprising an end; 
 the motor controller being a control board that is not enclosed in a control box; the control board comprising: a microprocessor unit comprising an input end, an IGBT switch and a drive unit thereof comprising an output end, a detection unit for detecting operating parameters of the motor, and a DIP switch unit comprising an output end; 
   
       wherein
 the wind wheel is disposed inside the fan housing; 
 the ECM motor is disposed on the surface of the fan housing; 
 the end of the rotor shaft of the rotor protrudes inside the fan housing and is connected to the wind wheel; 
 the motor body is connected to the motor controller via an electric wire; 
 the detection unit transmits operating parameters of the motor to the microprocessor unit; 
 the microprocessor unit outputs a signal to control the IGBT switch and the drive unit thereof; 
 the output end of the IGBT switch and the drive unit thereof is connected to the coil winding of the stator; and 
 the output end of the DIP switch unit is connected to the input end of the microprocessor unit. 
 
     
     
         2 . The induced draft fan of  claim 1 , wherein the DIP switch unit comprises a plurality of independent DIP switches. 
     
     
         3 . The induced draft fan of  claim 1 , wherein a number of the DIP switches is between seven and twelve. 
     
     
         4 . The induced draft fan of  claim 1 , wherein the microprocessor unit reads a signal of each DIP switch of the DIP switch unit to form a code set, selects parameters of a rotational speed, a torque, and an air volume, and outputs a signal to control the IGBT switch and the drive unit thereof. 
     
     
         5 . The induced draft fan of  claim 1 , wherein
 the control board further comprises a gear switch detection circuit;   the gear switch detection circuit detects a plurality of gear switch signals output by a system controller and transmits the gear switch signals to the microprocessor; and   the microprocessor outputs a signal to control the IGBT switch and the drive unit thereof according to the gear switch signals.   
     
     
         6 . The induced draft fan of  claim 2 , wherein
 the control board further comprises a gear switch detection circuit;   the gear switch detection circuit detects a plurality of gear switch signals output by a system controller and transmits the gear switch signals to the microprocessor; and   the microprocessor outputs a signal to control the IGBT switch and the drive unit thereof according to the gear switch signals.   
     
     
         7 . The induced draft fan of  claim 3 , wherein
 the control board further comprises a gear switch detection circuit;   the gear switch detection circuit detects a plurality of gear switch signals output by a system controller and transmits the gear switch signals to the microprocessor; and   the microprocessor outputs a signal to control the IGBT switch and the drive unit thereof according to the gear switch signals.   
     
     
         8 . The induced draft fan of  claim 4 , wherein
 the control board further comprises a gear switch detection circuit;   the gear switch detection circuit detects a plurality of gear switch signals output by a system controller and transmits the gear switch signals to the microprocessor; and   the microprocessor outputs a signal to control the IGBT switch and the drive unit thereof according to the gear switch signals.   
     
     
         9 . The induced draft fan of  claim 5 , wherein the gear switch detection circuit comprises a plurality of optical coupling isolation circuits. 
     
     
         10 . The induced draft fan of  claim 6 , wherein the gear switch detection circuit comprises a plurality of optical coupling isolation circuits. 
     
     
         11 . The induced draft fan of  claim 7 , wherein the gear switch detection circuit comprises a plurality of optical coupling isolation circuits. 
     
     
         12 . The induced draft fan of  claim 8 , wherein the gear switch detection circuit comprises a plurality of optical coupling isolation circuits. 
     
     
         13 . The induced draft fan of  claim 5 , wherein
 the microprocessor unit is connected to a communication port;   the microprocessor unit communicates with a PC computer via the communication port; and   the PC computer sets or modifies the operating parameters of the motor in the microprocessor by programming   
     
     
         14 . The induced draft fan of  claim 6 , wherein
 the microprocessor unit is connected to a communication port;   the microprocessor unit communicates with a PC computer via the communication port; and   the PC computer sets or modifies the operating parameters of the motor in the microprocessor by programming.   
     
     
         15 . The induced draft fan of  claim 7 , wherein
 the microprocessor unit is connected to a communication port;   the microprocessor unit communicates with a PC computer via the communication port; and   the PC computer sets or modifies the operating parameters of the motor in the microprocessor by programming.   
     
     
         16 . The induced draft fan of  claim 8 , wherein
 the microprocessor unit is connected to a communication port;   the microprocessor unit communicates with a PC computer via the communication port; and   the PC computer sets or modifies the operating parameters of the motor in the microprocessor by programming.