Mechanical seal

Patent metadata

Field	Value
Publication number	US-9841108-B2
Application number	US-201214124653-A
Country	US
Kind code	B2
Filing date	Apr 27, 2012
Priority date	Jun 10, 2011
Publication date	Dec 12, 2017
Grant date	Dec 12, 2017

Abstract

An inside-type mechanical seal is mounted between a rotating shaft and a housing, and adapted for preventing leakage of a sealed fluid from an outer circumference of a sliding surface in the direction of an inner circumference thereof, wherein provided are a rotary-side sealing ring mounted on a rotating shaft side, a stationary-side sealing ring mounted on a seal case side, an annular packing for pushing the stationary-side sealing ring toward the rotary-side sealing ring, a holding part on the outer circumferential side being fitted in the seal case, and a seal lip part on the inner circumferential side being in close contact with the stationary-side sealing ring, and wherein provided to the seal case is a ring-shaped projection abutting against a back surface of the packing during assembly of the mechanical seal, and adapted for pushing the packing toward the stationary-side sealing ring.

First claim

The invention claimed is:

1. An inside-type mechanical seal mounted between a rotating shaft ad a housing and adapted for preventing leakage of a sealed fluid from an outer circumference of a sliding surface in a direction of an inner circumference thereof, said seal comprising
a rotary-side sealing ring mounted on a rotating shaft side and a stationary-side sealing ring mounted on a seal case side; and
an annular packing formed of a rubbery elastic material defined by an outer circumference and an inner circumference which is radially closer to the shaft than is the outer circumference, wherein the stationary-side sealing ring and the rotary-side sealing ring are pushed to each other only by the annular packing, and without a spring on either side of the stationary-side sealing ring or the rotary-side sealing ring;
said annular packing comprising:
a holding part provided on the outer circumferential side of the annular packing and fitted in a recess of the seal case for holding the annular packing in the seal case, and
a seal lip part provided on the inner circumferential side of the annular packing and being in close contact with the stationary-side sealing ring, said seal lip part having a front side facing toward the sliding surface and contacting the stationary-side sealing ring, and a back side facing away from the sliding surface;

wherein the seal case has a ring-shaped projection formed along a circumferential direction, projecting from the seal case into the recess of the seal case on the inner circumferential side in an axial direction toward the sliding surface, and being in positive contact with and abutting against a part of the back side of the seal lip part during assembly of the mechanical seal, said ring-shaped projection pushing the part of the back side of the seal lip part of the inner circumferential side of the annular packing toward the stationary-side sealing ring.

2. The mechanical seal as set forth in claim 1 , wherein the ring-shaped projection provided to the seal case is formed from a metal, and the packing is formed from a rubbery elastic material.

3. The mechanical seal as set forth in claim 2 , wherein the ring-shaped projection is integrally provided to the seal case.

4. The mechanical seal as set forth in claim 1 , characterized in that the packing and the ring-shaped projection provided to the seal case are formed from a rubber elastic material.

5. The mechanical seal as set forth in claim 4 , characterized in that the rubber hardness of the packing is higher than the rubber hardness of the ring-shaped projection.

6. The mechanical seal as set forth in claim 4 , characterized in that the rubber hardness of the packing and the rubber hardness of the ring-shaped projection are substantially the same.

7. The mechanical seal as set forth in claim 4 , characterized in that the ring-shaped projection is provided to the seal case by being baked.

8. The mechanical seal as set forth in claim 1 , characterized in that the ring-shaped projection provided to the seal case is formed from an O-ring, and the packing is formed from a rubbery elastic material.

9. The mechanical seal as set forth in claim 5 , characterized in that the ring-shaped projection is provided to the seal case by being baked.

10. The mechanical seal as set forth in claim 6 , characterized in that the ring-shaped projection is provided to the seal case by being baked.

Assignees

• Aoike Hiroshi
• Ikarashi Takeshi
• Eagle Ind Co Ltd
• Eagleburgmann Japan Co Ltd

Inventors

• Aoike Hiroshi
• Ikarashi Takeshi

Classifications

• F16J15/344

  the pressing force being applied by means of an elastic ring supporting the slip-ring · CPC title

• F16J15/38 Primary

  sealed by a packing · CPC title