| 摘要 |
<p>PURPOSE: To avoid teeth abrasion during seal engagement under high pressure by arranging a fluid injection means that injects fluid to the space between front of a support portion and rear of a seal portion of a gate rotor. CONSTITUTION: A screw 1 rotates about the axle XX inside a bore 2a of a fixed casing 2, and has screw thread 3, 4 formed between the screw groove 5 that is engaged with teeth 6 of a gate rotor 7. A sealing portion 8 has a front face 8a exposed to a suction pressure, and a rear face 8b that is face- contact with front face 9a of a support portion 9. The support portion 9 is equipped with an axial main duct 13 into which a fluid is delivered by a fixed injector 14 that is pressed by a spring 15 to the free end of the gate rotor shaft in one body with the support portion 9.</p> |
