Shaft sealing device

Patent metadata

Field	Value
Publication number	US-2025035213-A1
Application number	US-202218280921-A
Country	US
Kind code	A1
Filing date	Mar 7, 2022
Priority date	Mar 15, 2021
Publication date	Jan 30, 2025
Grant date	—

Abstract

A shaft sealing device capable of maintaining high lubricity between sliding surfaces is provided. Communication paths communicating with an external space are connected to a drive space and a fluid in the drive space introduced between a pair of sliding surfaces by a fluid introduction mechanism is replenished from an external space through the communication paths.

First claim

1 . A shaft sealing device, comprising:
a casing which has a drive space accommodating a drive unit; a rotating shaft which penetrates the casing and is disposed to extend from the drive space to a sealed fluid side space; and a seal component which is disposed between the casing and the rotating shaft, has a pair of sliding surfaces sliding relatively with each other in a facing state, and has a fluid introduction mechanism formed on at least one of the pair of sliding surfaces so that a fluid in the drive space is introduced between the pair of sliding surfaces, wherein a communication path which communicates with an external space is connected to the drive space.

2 . The shaft sealing device according to claim 1 ,
wherein a flow blocking portion is provided in the casing, wherein the drive space is partitioned into a seal component side space and a drive unit side space by the flow blocking portion, and wherein the communication path is connected to the seal component side space.

3 . The shaft sealing device according to claim 2 ,
wherein the flow blocking portion is a bearing.

4 . The shaft sealing device according to claim 1 ,
wherein the seal component is a mechanical seal having a pair of sliding parts rotating relatively with each other.

5 . The shaft sealing device according to claim 1 ,
wherein the shaft sealing device is configured for use in a device immersed in water, and wherein the communication path is partially defined by a tube which is connected to a communication hole provided in the casing and extends to the external space.

6 . The shaft sealing device according to claim 1 ,
wherein a fluid in the drive space is a gas and a fluid in the sealed fluid side space is a liquid, wherein the casing is provided with a through hole through which the rotating shaft is inserted and a liquid reservoir groove which is formed on an outer radial side in relation to the through hole, and wherein the communication path communicates with the drive space at a position above the liquid reservoir groove.

7 . The shaft sealing device according to claim 2 ,
wherein the seal component is a mechanical seal having a pair of sliding parts rotating relatively with each other.

8 . The shaft sealing device according to claim 2 ,
wherein the shaft sealing device is configured for use in a device immersed in water, and wherein the communication path is partially defined by a tube which is connected to a communication hole provided in the casing and extends to the external space.

9 . The shaft sealing device according to claim 2 ,
wherein a fluid in the drive space is a gas and a fluid in the sealed fluid side space is a liquid, wherein the casing is provided with a through hole through which the rotating shaft is inserted and a liquid reservoir groove which is formed on an outer radial side in relation to the through hole, and wherein the communication path communicates with the drive space at a position above the liquid reservoir groove.

10 . The shaft sealing device according to claim 3 ,
wherein the seal component is a mechanical seal having a pair of sliding parts rotating relatively with each other.

11 . The shaft sealing device according to claim 3 ,
wherein the shaft sealing device is configured for use in a device immersed in water, and wherein the communication path is partially defined by a tube which is connected to a communication hole provided in the casing and extends to the external space.

12 . The shaft sealing device according to claim 3 ,
wherein a fluid in the drive space is a gas and a fluid in the sealed fluid side space is a liquid, wherein the casing is provided with a through hole through which the rotating shaft is inserted and a liquid reservoir groove which is formed on an outer radial side in relation to the through hole, and wherein the communication path communicates with the drive space at a position above the liquid reservoir groove.

13 . The shaft sealing device according to claim 4 ,
wherein the shaft sealing device is configured for use in a device immersed in water, and wherein the communication path is partially defined by a tube which is connected to a communication hole provided in the casing and extends to the external space.

14 . The shaft sealing device according to claim 4 ,
wherein a fluid in the drive space is a gas and a fluid in the sealed fluid side space is a liquid, wherein the casing is provided with a through hole through which the rotating shaft is inserted and a liquid reservoir groove which is formed on an outer radial side in relation to the through hole, and wherein the communication path communicates with the drive space at a position above the liquid reservoir groove.

15 . The shaft sealing device according to claim 5 ,
wherein a fluid in the drive space is a gas and a fluid in the sealed fluid side space is a liquid, wherein the casing is provided with a through hole through which the rotating shaft is inserted and a liquid reservoir groove which is formed on an outer radial side in relation to the through hole, and wherein the communication path communicates with the drive space at a position above the liquid reservoir groove.

Assignees

• Eagle Ind Co Ltd

Inventors

• NEGISHI Yuta
• Uchiyama Ryosuke
• YAMAGUCHI Gai
• Maetani Yuki
• Tsukamoto Takahiro
• Matsumoto Osamu
• MIYAZAKI Sayaka
• Inoue Hiroki
• ONUMA Minori
• MAKISHIMA So

Classifications

• H02K5/124

  Sealing of shafts · CPC title

• F04D29/128

  with special means for adducting cooling or sealing fluid · CPC title

• F16J15/34 Primary

  with slip-ring pressed against a more or less radial face on one member · CPC title

• F04D29/12

  using sealing-rings · CPC title

• F04D29/04

  Shafts or bearings, or assemblies thereof (specially adapted for elastic fluid pumps F04D29/05) · CPC title