| 摘要 |
A coupling device for coupling a rotor and an impeller of an electric pump has a coupler body 41 fixed to a shaft of the rotor and accommodated within a cavity 31 of the impeller 11. The body 41 comprises a cylindrical portion 43 and a flange 42 located at one end of the cylindrical portion 43. The cavity 31 has an inner section 32 accommodating the cylindrical portion 43 of the body and an outer section 33 of larger diameter accommodating the flange 42. The flange 42 has a groove 46 on a surface facing the impeller 11. The impeller has two grooves 36 on a surface confronting the flange, the grooves 36, 46 co-operating to form two arcuate tunnels of circular cross-section. Inside each tunnel is located a spherical ball 50. Rotation of the impeller with respect to the body causes the balls to move along the grooves until at least one tunnel is reduced in length to the diameter of the ball whereby further relative rotation in the same direction between the impeller and coupler body is prevented. A retaining plate 37 retains the coupler body 41 within the cavity 31 of the impeller and a spring washer 38 maintains frictional contact on the balls by the impeller and the coupler body . <IMAGE> |
