Shaft sealing structure and primary coolant circulation pump

Patent metadata

Field	Value
Publication number	US-10914382-B2
Application number	US-201816110654-A
Country	US
Kind code	B2
Filing date	Aug 23, 2018
Priority date	Aug 24, 2017
Publication date	Feb 9, 2021
Grant date	Feb 9, 2021

Abstract

A shaft sealing structure for a rotation shaft, includes a sealing ring having ends formed by removal of its part. The ends abutting each other are continuous in the circumferential direction when the sealing ring is reduced in diameter to a radially inner side. The sealing ring is provided along the circumferential direction of the rotation shaft so as to be contactable with an outer peripheral surface of the rotation shaft. The structure also includes a pressing member configured to be movable between a pressing position and a retracted position; an elastic member configured to bias the pressing member toward the pressing position by elastic force; and a support member configured to support the pressing member at the retracted position against the elastic force, and to allow the pressing member to move to the pressing position at a predetermined temperature.

First claim

The invention claimed is:

1. A shaft sealing structure for a rotation shaft, comprising:
a sealing ring having a ring shape in which a part is removed in a circumferential direction so that the sealing ring has ends formed by removal of the part, wherein the ends abutting each other are continuous in the circumferential direction when the sealing ring is reduced in diameter to a radially inner side, and the sealing ring is provided along the circumferential direction of the rotation shaft so as to be contactable with an outer peripheral surface of the rotation shaft;
a pressing member configured to be movable between a pressing position at which the pressing member presses the sealing ring to the radially inner side and a retracted position at which the pressing member is retracted from the pressing position;
an elastic member configured to bias the pressing member toward the pressing position by elastic force;
a support member configured to support the pressing member at the retracted position against the elastic force of the elastic member, and to allow the pressing member to move to the pressing position at a predetermined temperature or higher; and
a communicating portion configured to communicate between an outer circumferential portion of the rotation shaft and a surface of the support member so that a fluid flows from the outer circumferential portion of the rotation shaft to the surface of the support member,
wherein the support member is disposed in a space defined by a top surface of the pressing member and an outer surface of the sealing ring,
wherein the communicating portion terminates at the surface of the support member,
and wherein the support member has recesses and protrusions formed on a surface thereof.

2. The shaft sealing structure according to claim 1 , wherein the communicating portion is provided to pass through the pressing member.

3. The shaft sealing structure according to claim 1 , wherein the communicating portion is provided to pass through the sealing ring in a radial direction.

4. A shaft sealing structure for a rotation shaft, comprising:
a sealing ring having a ring shape in which a part is removed in a circumferential direction so that the sealing ring has ends formed by removal of the part, wherein the ends abutting each other are continuous in the circumferential direction when the sealing ring is reduced in diameter to a radially inner side, and the sealing ring is provided along the circumferential direction of the rotation shaft so as to be contactable with an outer peripheral surface of the rotation shaft;
a pressing member configured to be movable between a pressing position at which the pressing member presses the sealing ring to the radially inner side and a retracted position at which the pressing member is retracted from the pressing position;
an elastic member configured to bias the pressing member toward the pressing position by elastic force;
a support member configured to support the pressing member at the retracted position against the elastic force of the elastic member, and to allow the pressing member to move to the pressing position at a predetermined temperature or higher; and
a communicating portion configured to communicate between an outer circumferential portion of the rotation shaft and a surface of the support member so that a fluid flows from the outer circumferential portion of the rotation shaft to the surface of the support member,
wherein the support member is disposed in a space defined by a top surface of the pressing member and an outer surface of the sealing ring,
wherein the communicating portion terminates at the surface of the support member,
wherein the support member has recesses and protrusions formed on a surface thereof, and
at least one of the sealing ring and the pressing member has recesses and protrusions formed on a surface thereof and engaged with the recesses and protrusions formed on the support member.

5. The shaft sealing structure according to claim 1 , wherein the support member is formed by mixing a resin material that is softened at a predetermined temperature or higher and a heat conductive material having heat conductivity.

6. The shaft sealing structure according to claim 1 , wherein
the support member is formed by being divided into a softened portion to be softened at a predetermined temperature or higher and a heat transfer portion having heat conductivity, and
the softened portion and the heat transfer portion are provided along a movement direction of the pressing member.

7. The shaft sealing structure according to claim 1 , wherein
the support member is formed by being divided into a softened portion to be softened at a predetermined temperature or higher and a heat transfer portion having heat conductivity, and
the softened portion and the heat transfer portion are provided in a row in a direction intersecting with a movement direction of the pressing member.

8. A shaft sealing structure for a rotation shaft, comprising:
a sealing ring having a ring shape in which a part is removed in a circumferential direction so that the sealing ring has ends formed by removal of the part, wherein the ends abutting each other are continuous in the circumferential direction when the sealing ring is reduced in diameter to a radially inner side, and the sealing ring is provided along the circumferential direction of the rotation shaft so as to be contactable with an outer peripheral surface of the rotation shaft;
a pressing member configured to be movable between a pressing position at which the pressing member presses the sealing ring to the radially inner side and a retracted position at which the pressing member is retracted from the pressing position;
an elastic member configured to bias the pressing member toward the pressing position by elastic force;
a support member configured to support the pressing member at the retracted position against the elastic force of the elastic member, and to allow the pressing member to move to the pressing position at a predetermined temperature or higher; and
a communicating portion configured to communicate between an outer circumferential portion of the rotation shaft and a surface of the support member so that a fluid flows from the outer circumferential portion of the rotation shaft to the surface of the support member,
wherein the support member is disposed in a space defined by a top surface of the pressing member and an outer surface of the sealing ring,
wherein the communicating portion terminates at the surface of the support member,
wherein the support member includes a plate-shaped member configured to support the pressing member located at the retracted position against a movement direction and to be softened at a predetermined temperature or higher, and
the plate-shaped member is formed by being divided in the circumferential direction by a plurality of cutting grooves extending in the movement direction of the pressing member.

9. The shaft sealing structure according to claim 1 , wherein the support member has a through hole formed therein.

10. A shaft sealing structure for a rotation shaft, comprising:
a sealing ring having a ring shape in which a part is removed in a circumferential direction so that the sealing ring has ends formed by removal of the part, wherein the ends abutting each other are continuous in the circumferential direction when the sealing ring is reduced in diameter to a radially inner side, and the sealing ring is provided along the circumferential direction of the rotation shaft so as to be contactable with an outer peripheral surface of the rotation shaft;
a pressing member configured to be movable between a pressing positio

Assignees

• Mitsubishi Heavy Ind Ltd

Inventors

• Komatsu Naotaka
• Hori Takumi
• Otani Yuichi
• Kafuku Hidetaka
• Okamoto Hiromu
• Tanaka Shunsuke
• Takayama Yasushi
• Hanada Tomoki

Classifications

• F04D29/5893

  heat insulation or conduction · CPC title

• F04D29/146 Primary

  especially adapted for liquid pumps · CPC title

• F16J15/3484

  Tandem seals · CPC title

• F16J15/164 Primary

  the sealing action depending on movements; pressure difference, temperature or presence of leaking fluid · CPC title

• F16J15/3436 Primary

  Pressing means · CPC title