The invention relates a concentration diluting device used for
hydrogen discharged by a fuel
cell passenger car, pertaining to the field of application technology of the fuel
cell passenger car; the device comprises a photoelectric
receiver, a photoelectric proximity switch, an electric fan, two static-free meshes, a
hydrogen piping, a main body of the diluting device, a plurality of baffle plates, an
electromagnetic valve and a fault
detector of the electric fan. The main body of the diluting device is a body case with an opening on both ends; the two static-free meshes are connected with the inner walls on the both ends of the main body of the diluting device; the photoelectric
receiver is arranged on the central shaft of the motor of the electric fan; the photoelectric proximity switch is arranged on the body case of the electric fan and connected with the fault
detector of the electric fan; the
hydrogen piping is communicated with the hydrogen inlet of the air inlet end of the main body of the diluting device and connected with a discharged hydrogen
pipe by the
electromagnetic valve. Under various working conditions of the passenger car, the device is capable of reducing the concentration of Purge to the safety level and has the advantages of small volume, compact structure, safety and reliability.