| 摘要 |
<p>1. A needle screw device for adjusting the flow of a fluid, comprising : - a cylindrical housing (1) comprising a tapped part (1a) and a smooth part (1b), - an axial orifice (2) forming a seat provided at the bottom of the cylindrical housing (1) and communicating with a first flow duct (3) for the fluid, - a needle screw (4) comprising a threaded part (4a) cooperating with the tapped part (1a) of the cylindrical housing (1) a smooth part (4b) opposite the smooth part (1b) of the cylindrical housing (1) and an internal end (5) forming a valve for cooperating with the seat-forming orifice (2) of the cylindrical housing (1), - a radial orifice (6) opening into a space (7) defined by the needle screw (4) and the cylindrical housing (1), this radial orifice (6) communicating with a second flow duct (8) for the fluid, - a sealing member (11) between the facing smooth parts (1b, 4b) respectively of the cylindrical housing (1) and of the needle screw (4), - and means (13) for rotatably actuating the needle screw (4), characterized by the fact that the external end (14) of the needle screw (4) opposite its internal end (5) comprises an outwardly tapering and deformable part (15) whose outer diameter, when the needle screw (4) is not in position, is greater than the inner diameter of the smooth part (1b) of the cylindrical housing (1) in which this external end (14) is housed during positioning of the needle screw (4), whereby, when the needle screw (4) is positioned, the needle screw (4) is efficiently secured against rotation because of the friction between the tapered and deformable part (15) and the smooth part (1b) and precise positioning is obtained between the axis of the needle screw (4) and the axis of the cylindrical housing (1), because of the centering of the tapering and deformable part (15) in the smooth part (1b).</p> |
