JPH03110138U

JPH03110138U -

Info

Publication number: JPH03110138U
Application number: JP1861590U
Authority: JP
Priority date: 1990-02-26
Filing date: 1990-02-26
Publication date: 1991-11-12

Description

[Brief explanation of drawings]

第１図はこの考案のスクリユー式過給機の軸シ
ール構造の一実施例にかかる断面図、第２図及び
第３図はそれぞれこの考案のスクリユー式過給機
の軸シール構造に使用する逆止弁の断面図及び底
面図である。第４図は従来のスクリユー式過給機
の断面図、第５図はエンジンへの搭載例の説明図
である。１，２……ケーシング、５……雄ロータ、６…
…雌ロータ、７……雄ロータ軸、８……雌ロータ
軸、９……軸受部、１４……タイミングギヤ、１
７……タイミングギヤ、２０……エンジン、２１
……スロツトルバルブ、２２……給気管、３０…
…スクリユー式過給機の軸シール構造、３１……
ラビリンスシール（ケーシングと別体のフイン状
シールの例）、３２……スリーブ、３３……リツ
プシール、３４……空隙、３５……連通路、３６
……雌ねじ、３７，３７Ａ，３７Ｂ……逆止弁、
３８，４５，５２……弁本体、３９，４６，５３
……流路、４０，４７，５４……弁座、４１，４
８，５５……弁体、４９，５６……弁押え、５０
，５７……小孔、４４，５１，５８……雄ねじ。 Fig. 1 is a sectional view of an embodiment of the shaft seal structure of the screw type turbocharger of this invention, and Figs. FIG. 3 is a cross-sectional view and a bottom view of the stop valve. FIG. 4 is a sectional view of a conventional screw type supercharger, and FIG. 5 is an explanatory diagram of an example of mounting it on an engine. 1, 2...Casing, 5...Male rotor, 6...
...Female rotor, 7...Male rotor shaft, 8...Female rotor shaft, 9...Bearing section, 14...Timing gear, 1
7...Timing gear, 20...Engine, 21
...Throttle valve, 22...Air supply pipe, 30...
...Shaft seal structure of screw type supercharger, 31...
Labyrinth seal (example of a fin-shaped seal separate from the casing), 32...Sleeve, 33...Lip seal, 34...Gap, 35...Communication path, 36
...Female thread, 37, 37A, 37B...Check valve,
38, 45, 52... Valve body, 39, 46, 53
...Flow path, 40,47,54...Valve seat, 41,4
8, 55... Valve body, 49, 56... Valve holder, 50
, 57... Small hole, 44, 51, 58... Male thread.

Claims

[Claims for Utility Model Registration] (1) A non-contact type fin-shaped seal and a contact type lip seal are arranged on the rotor shaft between the discharge side end of the rotor and the bearing, and there is an even gap between the two seals. A shaft seal structure for a screw type supercharger, characterized in that a pressure gap is formed and a check valve is provided in the gap to suck air from the outside when the inside becomes a negative pressure state. (2) The check valve includes a valve body in which a flow path with a valve seat is formed, and a valve body for opening and closing the valve seat is installed in the flow path, and communicates with the outside when the valve seat is closed. 2. The valve body according to claim 1, wherein a small hole is formed to release pressure in the flow path, and a valve holder is inserted from outside the valve body to restrict movement of the valve body in the flow path. Shaft seal structure of screw type turbocharger.