1. The diffusor of the present invention mixes three kinds of color light emitted by the red LED, the green LED and the blue LED into white light.

2. The suction-stage, middle-stage, discharge-stage, diffusor and bearing support forms a working chamber and shaft, impeller, balance kettle and shaft sleeve are pump rotor parts.

3. The support member is set between the diffusor and the carrier, and the reflecting plate on two sides of the carrier and the diffusor.

4. The phenomenon and law of unsteady flow in blade diffusor is analyzed in detail.

5. The light source for back light assembly includes red LED, green LED, blue LED, diffusor, support member and reflecting plate.

6. The main parts of pump are suction-stage, middle-stage, discharge-stage, bearing support, motor support, impeller, diffusor, shaft, shaft bearing, shaft sleeve, balance kettle, balance sleeve etc.