| 摘要 |
<p>PURPOSE:To get rid of any loading in a silencing member and an exhaust port as well as to reduce impact noises of the medium hit to this inner wall, by making a large quantity of abrasion powder to be discharged out of a pump discharge port stay in a powder receiver consisting of the projection installed in an inner wall inside a silencer closed chamber. CONSTITUTION:Such a projection 13 that narrows a passage sectional area of a medium of the air discharged out of a discharge port 10 and becomes a weir against a medium flow is installed in an inner wall surface of a closed chamber 9 to be used as a diffusion chamber of a silencer, and a powder receiver 14 is formed by this projection 13 and the inner wall surface of the closed chamber 9. With this constitution, even if abrasion powder of a vane 7 is discharged out together with the medium of air or the like from a pump, it is collected in the powder receiver 14 consisting of the projection 13 installed in the inner wall surface of the closed chamber 9 being used as the difusion chamber of the silence.r Therefore, impact noises caused by a collision with the inner wall of the closed chamber 9 is reduced, and the vicinity of a discharger port 11 is not almost affected by the vane abrasion powder, so that if a silencing member is sealed in and around this discharge port 11, any loading in the silencing member and the discahrge port 11 is brought to notching, thus a silencing effect is yet more improved.</p> |
