JPH0413868U

JPH0413868U -

Info

Publication number: JPH0413868U
Application number: JP5382190U
Authority: JP
Priority date: 1990-05-23
Filing date: 1990-05-23
Publication date: 1992-02-04
Anticipated expiration: 2005-02-08
Also published as: JPH075324Y2

Description

[Brief explanation of the drawing]

第１図は本考案の一実施例を示すシヤツトダウ
ンシール非作動時の断面図、第２図〔イ〕〔ロ〕
は同じくメカニカルシートの作動説明図、第３図
は同じくシヤツトダウンシールが機能した状態を
断面図、第４図は同じ未装着状態における要部断
面図である。２……ハウジング、４……シヤフト、６……回
転側摺動リング、１０……静止側摺動リング、１
２……ケース、１４……内径筒状部、１６……外
径筒状部、２０……スプリング、２６……リテー
ナ、２８……内径フランジ部、３０……外径フラ
ンジ部、３２……シールリング、３４……スリツ
ト、３８……隙間、４０……導圧孔、４２……第
一の圧油循環孔、４４……第二の圧油循環孔、５
４……透孔、５６……ドライブピン（係合手段）
、５８……長孔（係合手段）、Ａ……油側空間、
Ｂ……ガス側空間。 Fig. 1 is a sectional view of an embodiment of the present invention when the shutdown seal is not in operation, and Fig. 2 [A] and [B]
FIG. 3 is a cross-sectional view of the same state in which the shutdown seal is functioning, and FIG. 2... Housing, 4... Shaft, 6... Rotating side sliding ring, 10... Stationary side sliding ring, 1
2...Case, 14...Inner diameter cylindrical part, 16...Outer diameter cylindrical part, 20...Spring, 26...Retainer, 28...Inner diameter flange part, 30...Outer diameter flange part, 32... Seal ring, 34... Slit, 38... Gap, 40... Pressure guiding hole, 42... First pressure oil circulation hole, 44... Second pressure oil circulation hole, 5
4...Through hole, 56...Drive pin (engaging means)
, 58...long hole (engaging means), A...oil side space,
B...Gas side space.

Claims

[Claims for Utility Model Registration] 1. Airtightly supported on the outer periphery of the inner cylindrical part of the case that is tightly fitted to the inner periphery of the housing, biased by a spring on the back, and in sliding contact with the rotating side sliding ring. a stationary side sliding ring that airtightly divides the periphery of the shaft into an oil side and a gas side; and a stationary side sliding ring that is located on the outer peripheral side of the stationary side sliding ring and is supported airtightly and movably in the axial direction on the inner periphery of the outer diameter cylindrical part of the case. and has a retainer having a seal ring axially opposed to the outer diameter part of the rotating side sliding ring on the inner diameter of the tip, and the housing has a rear surface of the outer diameter flange part of the tip of the retainer and an outer diameter cylindrical part of the case. A pressure guiding hole that introduces the pressure of the gas side space into the gap between the tip surfaces, a first pressure oil circulation hole that opens toward the outer periphery of the rotating side sliding ring, and a first pressure oil circulation hole that opens toward the outer periphery of the case. In addition to providing two pressure oil circulation holes,
A mechanical seal equipped with a shutdown seal mechanism, characterized in that a through hole communicating with the second pressure oil circulation hole is provided in the outer cylindrical portion of the case. 2. According to claim 1, the opposing surfaces of the rotating side sliding ring and the seal ring are formed in tapered shapes corresponding to each other, and a slit extending in the radial direction is formed in the inner diameter of the seal ring. Mechanical seal with a shutdown seal mechanism. 3. In the description of claim 1 or 2, the seal ring is fixed to an inner diameter flange portion provided at the tip of the retainer to protrude toward the front side of the outer diameter portion of the stationary side sliding ring, and is connected to the outer diameter cylindrical portion of the case. A shutdown seal mechanism characterized in that the retainers are provided with engagement means that engage with each other in the circumferential direction and restrict the axial movement of the retainers to an amount of movement that allows the seal ring to come into close contact with the rotating side sliding ring. Mechanical seal with.