# US 2018/0023559 A1 · Floating ring type mechanical seal

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- Number: US 2018/0023559 A1
- Document ID: US20180023559A1
- Status: Published application
- Kind: A1
- Application number: 15/527,239
- Filed: 2016-02-19
- Published: 2018-01-25
- Earliest claimed: 2015-03-09
- Assignees: Nippon Pillar Packing Co., Ltd.
- Applicants: Nippon Pillar Packing Co., Ltd.
- Inventors: Yuji SATO; Takashi NISHI
- Web page: https://patentgrep.com/patent/US20180023559A1

## CPC

- F04B 53/143: {Sealing provided on the piston}
- F04B 39/00: Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B 53/00: Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F16J 15/3472: {Means for centering or aligning the contacting faces}
- F16J 15/3484: {Tandem seals}
- F16J 15/3496: {use of special materials}
- F16J 15/3452: {the pressing force resulting from the action of a spring}
- F04B: POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS (machines for liquids, or pumps, of rotary-piston or oscillating-piston type F04C; non-positive-displacement pumps F04D; pumping of fluid by direct contact of another fluid or by using inertia of fluid to be pumped F04F)
- F16J: PISTONS {(specially adapted for dampers F16F9/32)}; CYLINDERS; SEALINGS

## Abstract

Provided is a floating ring type mechanical seal in which a floating ring is pinched and held between a rotary ring provided in a rotary shaft and a stationary ring provided in a seal casing to be movable in an axial direction while being urged toward the rotary ring so that a relative rotation of the floating ring with respect to the stationary ring is inhibited. The rotary ring is made of a sintered compact of SiC or cemented carbide. A diamond film is formed on a sealing surface sliding on the floating ring in the rotary ring. A diamond film continuous to the diamond film of the sealing surface is formed on an outer peripheral surface of the rotary ring and a rear surface, which is a surface opposite to the sealing surface, in the rotary ring.

## Claims

### Claim 1

A floating ring type mechanical seal in which a floating ring is pinched and held between a rotary ring provided in a rotary shaft and a stationary ring provided in a seal casing to be movable in an axial direction while being urged toward the rotary ring so that a relative rotation of the floating ring with respect to the stationary ring is inhibited,
wherein the rotary ring is made of a sintered compact of SiC or cemented carbide, and
wherein a diamond film is formed on a sealing surface sliding on the floating ring in the rotary ring and a diamond film continuous to the diamond film of the sealing surface is formed on an outer peripheral surface of the rotary ring and a rear surface, which is a surface opposite to the sealing surface, in the rotary ring.

### Claim 2

A floating ring type mechanical seal in which a floating ring is pinched and held between a rotary ring provided in a rotary shaft and a stationary ring provided in a seal casing to be movable in an axial direction while being urged toward the rotary ring so that a relative rotation of the floating ring with respect to the stationary ring is inhibited,
wherein the rotary ring is made of a sintered compact of SiC or cemented carbide, and
wherein a diamond film is formed on a sealing surface sliding on the floating ring in the rotary ring and a diamond film continuous to the diamond film of the sealing surface is formed on an inner peripheral surface of the rotary ring and a rear surface, which is a surface opposite to the sealing surface, in the rotary ring.

### Claim 3

A floating ring type mechanical seal in which a floating ring is pinched and held between a rotary ring provided in a rotary shaft and a stationary ring provided in a seal casing to be movable in an axial direction while being urged toward the rotary ring so that a relative rotation of the floating ring with respect to the stationary ring is inhibited,
wherein the rotary ring is made of a sintered compact of SiC or cemented carbide, and
wherein a diamond film is formed on a sealing surface sliding on the floating ring in the rotary ring and a diamond film continuous to the diamond film of the sealing surface is formed on an inner peripheral surface of the rotary ring and an outer peripheral surface of the rotary ring.

### Claim 4 (depends on 1)

The floating ring type mechanical seal according to claim 1,
wherein a heat transfer ring is provided on an outer periphery of a diamond film formed on the outer peripheral surface.

### Claim 5 (depends on 1)

The floating ring type mechanical seal according to claim 1,
wherein the diamond film has thermal conductivity of 1000 to 2000 W/m·k.

### Claim 6 (depends on 2)

The floating ring type mechanical seal according to claim 2,
wherein the diamond film has thermal conductivity of 1000 to 2000 W/m·k.

### Claim 7 (depends on 3)

The floating ring type mechanical seal according to claim 3,
wherein the diamond film has thermal conductivity of 1000 to 2000 W/m·k.

### Claim 8 (depends on 4)

The floating ring type mechanical seal according to claim 4,
wherein the diamond film has thermal conductivity of 1000 to 2000 W/m·k.