JPH03105771U

JPH03105771U -

Info

Publication number: JPH03105771U
Application number: JP1375790U
Authority: JP
Priority date: 1990-02-16
Filing date: 1990-02-16
Publication date: 1991-11-01

Description

[Brief explanation of drawings]

第１図は本考案のシヤツトダウンシール機構を
備えたメカニカルシールの一実施例を示す半裁断
面図、第２図は同じくシヤツトダウンシールが機
能した状態を示す半裁断面図である。２……ハウジング、４……シヤフト、６……メ
イテイングリング、６ａ……摺動面、６ｂ……背
面（反摺動面側の端面）、１４……シールリング
、１６……ケース、２８……段差部、３０……リ
テーナ、３０ａ……フランジ部、３０ｂ……大径
筒状部、３０ｃ……小径筒状部、３２……シール
手段、３４……第一のパツキング（Ｏリング）、
３６……第二のパツキング（Ｏリング）、３８…
…コイルスプリング（ばね手段）、４０……シヤ
ワーフラツシング孔、４２……環状溝、４４……
フラツシング孔、４６……圧力導入孔、４８……
圧力源、Ａ，Ｂ……空間。 FIG. 1 is a half-cut sectional view showing an embodiment of a mechanical seal equipped with the shutdown seal mechanism of the present invention, and FIG. 2 is a half-cut sectional view showing the state in which the shutdown seal is functioning. 2...Housing, 4...Shaft, 6...Mating ring, 6a...Sliding surface, 6b...Back surface (end surface on the non-sliding surface side), 14...Seal ring, 16...Case, 28 . . . Step portion, 30 . ,
36...Second packing (O-ring), 38...
... Coil spring (spring means), 40 ... Shower flushing hole, 42 ... Annular groove, 44 ...
Flushing hole, 46... Pressure introduction hole, 48...
Pressure source, A, B...space.

Claims

[Claims for Utility Model Registration] 1. A seal ring on the stationary side that slides into contact with the mating ring on the rotating side is elastically and airtightly supported in a case fixed to the inner peripheral surface of the housing, and A flange portion provided with a sealing means facing the end surface of the mating ring on the non-sliding surface side is provided in a step portion formed to face the case in the axial direction; a large-diameter cylindrical portion that is in airtight contact with the inner circumferential surface of the housing, which is the large-diameter side of the stepped portion, via a first packing; A retainer consisting of a small-diameter cylindrical part that is in airtight contact with the inner circumferential surface of the housing on the small-diameter side of the part via a second packing is provided so as to be freely movable in the axial direction, and a spring means is compressed between the retainer and the case. 1. A mechanical seal equipped with a shutdown seal mechanism, characterized in that the housing is provided with a pressure introduction hole opened in the stepped portion. 2. An annular groove facing the flushing hole of the housing is provided on the outer peripheral surface of the retainer, and a large number of shower flushing holes are provided that penetrate from the annular groove toward the vicinity of the outer periphery of the sliding portion of the mating ring and seal ring. A mechanical seal equipped with the shutdown seal mechanism according to claim 1.