JPH0380154U

JPH0380154U -

Info

Publication number: JPH0380154U
Application number: JP14228589U
Authority: JP
Priority date: 1989-12-08
Filing date: 1989-12-08
Publication date: 1991-08-16

Description

[Brief explanation of the drawing]

第１図は本考案の一実施例を示す断面図、第２
図は従来構造を示す半裁断面図、第３図は同じく
ベローズが移動した状態の半裁断面図である。１Ａ……密封空間側のメカニカルシール、１Ｂ
……反密封空間側のメカニカルシール、２，１２
……固定環、４，１４……回転環、５，１５……
ベローズ、６……コイルスプリング、９Ａ，９Ｂ
……ハウジング端壁、１０……シヤフト、１０Ａ
……小径側外周面、１０Ｂ……大径側外周面、１
１……段差部、Ａ……密封空間、Ｂ……反密封空
間、Ｃ……シールボツクス。 Fig. 1 is a sectional view showing one embodiment of the present invention;
The figure is a half-cut sectional view showing a conventional structure, and FIG. 3 is a half-cut sectional view showing the bellows in a moved state. 1A... Mechanical seal on the sealed space side, 1B
...Mechanical seal on the anti-sealed space side, 2,12
... Fixed ring, 4, 14 ... Rotating ring, 5, 15 ...
Bellows, 6...Coil spring, 9A, 9B
...Housing end wall, 10...Shaft, 10A
...Small diameter side outer peripheral surface, 10B...Large diameter side outer peripheral surface, 1
1...Step part, A...Sealed space, B...Anti-sealed space, C...Seal box.

Claims

[Scope of utility model registration request]

There are two sets of mechanical seals arranged in parallel in the axial direction in the seal box of the housing formed between the sealed space and the non-sealed space, and the sealed space side has a smaller diameter on the outer peripheral surface of the shaft that passes through the seal box. A stepped portion is formed approximately at the axial center of the seal box, and the fixed rings of both mechanical seals are hermetically fitted to the housing end walls at both ends of the seal box. The rotating ring of the seal is supported on the outer circumferential surface of the small diameter side of the shaft, and the rotating ring of the mechanical seal on the non-sealed space side is supported on the outer circumferential surface of the large diameter side of the shaft via bellows, and both rotating rings are supported by a common coil spring. The bellows is biased in opposite directions in the axial direction and slides into contact with the end faces of the fixed rings, and the rear end of the bellows fitted on the outer peripheral surface of the small diameter side of the shaft abuts the end face of the stepped portion of the shaft. A double mechanical seal shaft seal structure characterized by: