Mechanical seal

Abstract

The present invention provides a mechanical seal that allows for accurate monitoring of the condition of the sliding portion between the rotating sealing ring and the stationary sealing ring. [Solution] The mechanical seal of the present disclosure comprises a seal case surrounding a rotating shaft, a stationary sealing ring disposed within the seal case, and a rotating sealing ring provided integrally rotatably on the rotating shaft and sliding relative to the stationary sealing ring, wherein the seal case has an insertion hole communicating the inside and outside of the seal case, and a pin member inserted through the insertion hole of the seal case, the pin member having a first end that protrudes into the seal case from the insertion hole and contacts the stationary sealing ring, and a second end that protrudes outside the seal case from the insertion hole.

Claims

1. A seal case surrounding the rotating shaft, A stationary sealing ring disposed within the seal case, A mechanical seal comprising a rotating sealing ring that is integrally rotatable with the rotating shaft and slides relative to the stationary sealing ring, The seal case has an insertion hole that connects the inside and outside of the seal case, The seal case comprises a pin member inserted through the insertion hole, The aforementioned pin member is A first end portion that protrudes from the insertion hole into the seal case and contacts the stationary sealing ring, A mechanical seal having a second end portion that protrudes from the insertion hole to the outside of the seal case.

2. The mechanical seal according to claim 1, wherein the pin member also serves as an anti-rotation member that restricts the stationary sealing ring from rotating together with the rotating sealing ring.

3. The mechanical seal according to claim 1 or claim 2, further comprising an elastic member disposed between the inner circumferential surface of the insertion hole and the outer circumferential surface of the pin member.

4. A first restricting surface is provided within the insertion hole of the seal case, extending in a direction intersecting the communication direction of the insertion hole. The pin member, when inserted through the insertion hole, has a first opposing surface that is positioned opposite the first regulating surface from one side in the communication direction, The mechanical seal according to claim 3, wherein the elastic member includes a first elastic member disposed between the first regulating surface and the first opposing surface.

5. A second restricting surface is provided in the insertion hole of the seal case, at a position further away from the first restricting surface on one side in the communication direction, and extending in a direction intersecting the communication direction. The pin member, when inserted through the insertion hole, has a second opposing surface that is positioned opposite the second regulating surface from the other side in the communication direction, The mechanical seal according to claim 4, wherein the elastic member includes a second elastic member disposed between the second regulating surface and the second opposing surface.

6. The first elastic member is an annular member fitted onto the outer circumference of the pin member, The mechanical seal according to claim 5, wherein the first opposing surface is an annular surface located inside the seal case more than the second opposing surface, and is inclined so as to gradually move from the inner circumference to the outer circumference of the surface toward the outside of the seal case.

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