Shaft seal device and pump apparatus using the same

Patent metadata

Field	Value
Publication number	US-9297388-B2
Application number	US-201213628544-A
Country	US
Kind code	B2
Filing date	Sep 27, 2012
Priority date	Sep 27, 2011
Publication date	Mar 29, 2016
Grant date	Mar 29, 2016

Abstract

A shaft seal device includes: a rotary shaft; a seal member that is arranged on an outer periphery of the rotary shaft; a liquid chamber; and a seal member accommodation chamber that accommodates the seal member therein, wherein the liquid chamber and the seal member accommodation chamber is separated by a partition wall, wherein the rotary shaft passes through a shaft hole formed in the partition wall and an outer periphery of the rotary shaft is sealed by the seal member, wherein the partition wall is formed with a through-hole penetrating the partition wall, a hollow member is mounted in the through-hole, a protrusion part of the hollow member protrudes toward the seal member accommodation chamber to engage with the seal member, and wherein the liquid chamber and the seal member accommodation chamber communicate with each other through a hole of the hollow member.

First claim

What is claimed is:

1. A shaft seal device comprising:
a rotary shaft;
a seal member arranged on an outer periphery of the rotary shaft;
a liquid chamber filled with oil; and
a seal member accommodation chamber that accommodates the seal member therein,
wherein the liquid chamber and the seal member accommodation chamber are separated by a partition wall,
wherein the rotary shaft passes through a shaft hole formed in the partition wall,
wherein the seal member includes an annular piece which seals a gap between the outer periphery of the rotary shaft and the partition wall,
wherein the annular piece has a recess, in the axial direction, at a part of a circumferential portion,
wherein the partition wall includes a through-hole, a hollow member having a circumference smaller than a circumference of the rotary shaft is positioned in the through-hole while being spaced apart from the rotary shaft, and the hollow member includes a protruding portion that protrudes toward the seal member accommodation chamber and is engaged into the recess, and
wherein the liquid chamber and the seal member accommodation chamber communicate with each other through the hollow member.

2. A rotary pump apparatus comprising:
a rotary pump that pumps liquid;
a rotary shaft that drives the rotary pump; and
a seal member arranged on an outer periphery of the rotary shaft;
wherein the seal member is accommodated in a seal member accommodation chamber formed at the outer periphery of the rotary shaft,
wherein a liquid chamber connected to a chamber of the rotary pump and the seal member accommodation chamber are separated by a partition wall,
wherein the seal member includes an annular piece which seals a gap between the outer periphery of the rotary shaft and the partition wall,
wherein the annular piece has a recess, in the axial direction, at a part of a circumferential portion,
wherein the rotary shaft passes through a shaft hole formed in the partition wall,
wherein the partition wall includes a through-hole penetrating the partition wall, a hollow member having a circumference smaller than a circumference of the rotary shaft is positioned in the through-hole while being spaced apart from the rotary shaft, and the hollow member includes a protruding portion that protrudes toward the seal member accommodation chamber and is engaged with the recess, and
wherein the liquid chamber and the seal member accommodation chamber communicate with each other through the hollow member.

3. The rotary pump apparatus according to claim 2 ,
wherein the seal member accommodation chamber possesses two axial ends,
the rotary pump being provided on one side of one of the two axial ends,
a second rotary pump being provided on an other side of other of the two axial ends,
wherein the rotary pump and the second rotary pump driven by the rotary shaft are provided at the two axial ends of the seal member accommodation chamber so that a phase difference of a suction and a discharge between the pumps is 180 degrees,
wherein the seal member is axially movable in the seal member accommodation chamber in a direction extending along the rotary shaft, the two axial ends of the seal member accommodation chamber partitioned by the seal member respectively communicate with two of the liquid chambers that are connected to a respective chamber provided at the rotary pump and the second rotary pump, and
wherein the partition wall is arranged between the liquid chamber and the seal member accommodation chamber, and the hollow member is disposed at the partition wall.

4. The rotary pump apparatus according to claim 3 ,
wherein one of the liquid chamber and the seal member accommodation chamber communicate with each other through a bearing provided therebetween.

5. The rotary pump apparatus according to claim 2 ,
wherein the hollow member is arranged at a position at which an opening of the hollow member overlaps with an upper side space of the seal member accommodation chamber in a direction transverse to an axial direction extending along the rotary shaft.

6. The rotary pump apparatus according to claim 2 ,
wherein the partition wall includes a plurality of the through-holes and the hollow member is mounted in at least one of the plurality of the through-holes.

7. A shaft seal device comprising:
a rotary shaft possessing an outer periphery;
a seal member arranged on an outer periphery of the rotary shaft;
a liquid chamber;
a seal member accommodation chamber that accommodates the seal member;
the liquid chamber and the seal member accommodation chamber being separated from each other by a partition wall, the partition wall including a shaft hole passing through the partition wall;
the rotary shaft passing through the shaft hole in the partition wall and the outer periphery of the rotary shaft being sealed by the seal member;
the partition wall possessing a through-hole;
a pin having a circumference smaller than a circumference of the rotary shaft positioned in the through-hole of the partition wall while being spaced apart from the rotary shaft, the pin possessing a through-hole that communicates with both the liquid chamber and the seal member accommodation chamber;
the pin possessing a protruding part protruding from the through-hole of the partition wall and towards the seal member accommodation chamber;
wherein the protruding part engages a key recess provided on the seal member; and
wherein the liquid chamber and the seal member accommodation chamber communicate with each other through the through-hole of the pin.

8. The rotary pump apparatus according to claim 7 ,
wherein the seal member accommodation chamber possesses two axial ends,
the rotary pump being provided on one axial end side of the seal member accommodation chamber,
a second rotary pump being provided on the other axial end side of the seal member accommodation chamber,
wherein the rotary pump and the second rotary pump driven by the rotary shaft are provided at the two axial ends of the seal member accommodation chamber so that a phase difference of a suction and a discharge between the pumps is 180 degrees,
wherein the seal member is axially movable in the seal member accommodation chamber in a direction extending along the rotary shaft,
wherein the two axial ends of the seal member accommodation chamber partitioned by the seal member respectively communicate with two of the liquid chambers that are connected to a respective chamber provided at the rotary pump and the second rotary pump, and
wherein the partition wall is arranged between the liquid chamber and the seal member accommodation chamber, and the pin is disposed at the partition wall.

9. The rotary pump apparatus according to claim 8 ,
wherein one of the liquid chamber and the seal member accommodation chamber communicate with each other through a bearing provided therebetween.

10. The rotary pump apparatus according to claim 7 ,
wherein the pin is arranged at a position at which an opening of the through-hole of the pin overlaps with an upper side space of the seal member accommodation chamber in a direction transverse to an axial direction extending along the rotary shaft.

11. The rotary pump apparatus according to claim 7 ,
wherein the partition wall includes a plurality of the through-holes and the pin is disposed in at least one of the plurality of the through-holes.

Assignees

• Advics Co Ltd
• Denso Corp

Inventors

• Kato Daishi
• Ando Kunihito
• Nakamura Yuki
• Naganuma Takahiro
• Kawabata Tomoaki

Classifications

• F04D29/108 Primary

  the sealing fluid being other than the working liquid or being the working liquid treated · CPC title

• F04C15/0038

  Shaft sealings specially adapted for rotary-piston machines or pumps · CPC title

• F04C11/001

  of similar working principle · CPC title

• F04C2/102

  the two members rotating simultaneously around their respective axes · CPC title

• F04D29/128

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