Mechanical seal

Patent metadata

Field	Value
Publication number	US-10024436-B2
Application number	US-201515503331-A
Country	US
Kind code	B2
Filing date	Jul 14, 2015
Priority date	Aug 26, 2014
Publication date	Jul 17, 2018
Grant date	Jul 17, 2018

Abstract

In an embodiment, a mechanical seal includes: a bellows 10 sealing between a rotating-side seal ring 5 biased in the axial direction, and an outer periphery face of a rotational shaft 2; a case 11 fitted to the ring 5 and the outer periphery of the bellows 10; and a drive ring 12 tightening the bellows 10 to the shaft 2, wherein cutout grooves 5b running through in the axial direction are provided on the outer periphery area of the ring 5; detent cutout areas 5d are provided on the side face of the ring 5 on a sealing face S side in a manner extending in the circumferential direction from the cutout grooves 5b; and detent convex areas 11e are provided at the edge area of the case 11 on the ring 5 side in a manner facing the cutout grooves 5b and bulging in the inner-diameter direction.

First claim

What is claimed is:

1. A mechanical seal installed in a seal cavity formed between a housing and a rotational shaft to seal between the housing and rotational shaft, comprising: a bellows that seals between a rotating-side seal ring biased in an axial direction by a biasing member, and an outer periphery face of the rotational shaft; a case fitted to the rotating-side seal ring and an outer periphery of the bellows; and a drive ring that tightens the bellows to the rotational shaft; wherein:
a plurality of cutout grooves running through in the axial direction are provided on the outer periphery area of the rotating-side seal ring; detent cutout areas are provided on a side face of the rotating-side seal ring on a sealing face side in a manner extending in a circumferential direction from the cutout grooves; and detent convex areas are provided at an edge area of the case on the rotating-side seal ring side in a manner facing the cutout grooves and bulging in an inner-diameter direction so as to be able to pass through the cutout grooves,
wherein a bellows seal area is formed on a side of the bellows abutting a back face of the rotating-side seal ring; a plurality of projections that project from the bellows seal area toward the rotating-side seal ring side are provided in the circumferential direction on or near the bellows seal area; and the projections are set in such a way that, when the rotating-side seal ring and bellows are joined as one piece, the projections press the rotating-side seal ring in the axial direction to prevent the back face of the rotating-side seal ring from contacting the bellows seal area, but when the mechanical seal is installed between the housing and rotational shaft, the projections deform elastically to cause the back face of the rotating-side seal ring to abut the bellows seal area.

2. A mechanical seal according to claim 1 , wherein the detent cutout area is formed in a manner extending in one circumferential direction from the cutout groove; and a side face of the detent cutout area abutting a back face of the detent convex area is formed in parallel with a plane crossing at right angles with the rotational axis.

3. A mechanical seal according to claim 1 , wherein the detent cutout area is formed in a manner extending in one circumferential direction from the cutout groove; and a side face of the detent cutout area abutting a back face of the detent convex area is inclined so that the side face becomes deeper toward a circumferential edge.

4. A mechanical seal according to claim 1 , wherein the detent cutout area is formed in a manner extending in one circumferential direction from the cutout groove; and a side face of the detent cutout area abutting a back face of the detent convex area is inclined so that the side face becomes shallower toward a circumferential edge.

5. A mechanical seal according to claim 1 , wherein the detent cutout area is formed in a manner extending in one circumferential direction from the cutout groove; and a side face of the detent cutout area abutting a back face of the detent convex area is formed in parallel with a plane crossing at right angles with the rotational axis, and has a concave area formed on the side face that concaves in the axial direction near a circumferential edge.

6. A mechanical seal according to claim 1 , wherein the detent cutout area is formed in a manner extending in both circumferential directions from the cutout groove; and a side face of the detent cutout area abutting a back face of the detent convex area is formed in parallel with a plane crossing at right angles with the rotational axis.

7. A mechanical seal according to claim 1 , wherein the detent cutout area is formed in a manner extending in both circumferential directions from the cutout groove; and a side face of the detent cutout area abutting a back face of the detent convex area is inclined so that the side face becomes deeper toward a circumferential edge.

8. A mechanical seal according to claim 1 , wherein the detent cutout area is formed in a manner extending in both circumferential directions from the cutout groove; and a side face of the detent cutout area abutting a back face of the detent convex area is inclined so that the side face becomes shallower toward a circumferential edge.

9. A mechanical seal according to claim 2 , wherein a bottom face of the detent cutout area is formed in parallel with an outer periphery face of the rotating-side seal ring.

10. A mechanical seal according to claim 2 , wherein a bottom face of the detent cutout area is formed in a manner becoming shallower toward an edge of the bottom face in the circumferential direction.

11. A mechanical seal according to claim 3 , wherein a bottom face of the detent cutout area is formed in parallel with an outer periphery face of the rotating-side seal ring.

12. A mechanical seal according to claim 3 , wherein a bottom face of the detent cutout area is formed in a manner becoming shallower toward an edge of the bottom face in the circumferential direction.

Assignees

• Eagle Ind Co Ltd

Inventors

• Maruyama Hideki
• Kiryu Kenji
• Ikeda Yasuhiro
• Tani Kimihiro

Classifications

• F16J15/36 Primary

  connected by a diaphragm {or bellow} to the other member · CPC title

• F16J15/348

  Pre-assembled seals, e.g. cartridge seals · CPC title

• F16J15/3204

  with at least one lip · CPC title

• F16J15/38

  sealed by a packing · CPC title

• Y10S277/91

  O-ring seal · CPC title