| 摘要 |
PROBLEM TO BE SOLVED: To reduce a rotary load and to sharply delay the abrasion of a stator by forming at least the face of the stator to be kept in contact with a rotor into a flexible low-friction face. SOLUTION: This screw pump 1 is provided with a female screw-shaped stator 2 made of an elastic body such as rubber and formed with a double-pitch spiral groove and a male screw-shaped rotor 3 rotatably inserted into the stator 2 and made of a metal. The toner inputted from the opening section 9 of an input side housing 5 is fed to the input side of the pump 1 by a conveying screw 10 in this screw pump 1. The rotor 3 is rotating at this time, the toner is filled in an advancing cavity section 15 formed in the pump 1 by the rotation of the rotor 3, and the toner is shifted. A low-friction thin film is formed on the face of the stator 2 to be kept in slide contact with the rotor 3. A diamond- like carbon thin film having an amorphous structure made of constituting elements C, H is formed by coating as the low-friction thin film. |
