Vertical bearing device

Patent metadata

Field	Value
Publication number	US-10601283-B2
Application number	US-201815901552-A
Country	US
Kind code	B2
Filing date	Feb 21, 2018
Priority date	Feb 22, 2017
Publication date	Mar 24, 2020
Grant date	Mar 24, 2020

Abstract

A cooling portion has an air inlet into which cooling air flows and is positioned in a preset range. When a distance from the upper to lower ends of an oil chamber in the axial direction of a rotating shaft member is h, and the shortest distance between an outer peripheral face of a casing and an inner peripheral face of a cover is a, the preset range is set in the following manner. Specifically, the preset range is set between ¼h upward and 5/4h downward relative to the upper end of the oil chamber as a reference point, in the axial direction of the rotating shaft member. Additionally, the preset range is set between the outer peripheral face of the casing and relative to the outer peripheral face of the casing as a reference point, in the radial direction of the rotating shaft member.

First claim

What is claimed is:

1. A vertical bearing device comprising:
a cylindrical thrust collar that rotates together with a rotating shaft member extending in a direction of gravitational force;
a base plate that faces a lower end of the thrust collar;
a thrust bearing part that is provided in a part where the thrust collar and the base plate face each other in an axial direction of the rotating shaft member and that supports the rotating shaft member in the axial direction;
a casing that surrounds an outer peripheral side of the rotating shaft member, is formed into a container shape that, together with the base plate, integrally forms an oil chamber for storing lubricating oil and partitions the oil chamber into an upper oil chamber provided on the upper side and a lower oil chamber provided on the lower side in the direction of gravitational force;
a journal bearing part that is provided in a part where the casing and the thrust collar face each other in a radial direction of the rotating shaft member and that supports the rotating shaft member in the radial direction;
a cooling part that is provided integrally with the casing on the radially outer side of the casing has a lubricating oil passage part exposed from the casing and allows passage of the lubricating oil moving from the upper oil chamber to the lower oil chamber and cools the lubricating oil moving from the upper oil chamber to the lower oil chamber through the lubricating oil passage part by air on the outer peripheral side of the casing; and
a cover that is provided outside the casing in the radial direction of the rotating shaft member, and that forms, with the casing, a space through which air flows, wherein:
a casing has a flat plate portion in the circumferential direction,
the cooling part is provided in a position facing the flat plate portion,
the cooling part has an air inlet into which cooling air flows, and is positioned in a preset range;
when a distance from the upper to lower ends of the oil chamber in the axial direction of the rotating shaft member is h, and the shortest distance between an outer peripheral face of the casing and an inner peripheral face of the cover is a,
the preset range is set so that the center of the air inlet is positioned at a distance ranging from ¼h to ¾h downward relative to the upper end of the oil chamber as a reference point, in the axial direction of the rotating shaft member, and
the center of the air inlet is set at a distance ranging from (½)a to ( 3/2)a relative to the outer peripheral face of the casing as a reference point, in the radial direction of the rotating shaft member, and

the cooling part has a radiation portion tilted relative to the axial direction of the rotating shaft member by an angle of more than 0 degrees and no more than 90 degrees.

2. The vertical bearing device according to claim 1 , wherein
the cooling part is provided lower than an oil level of lubricating oil stored in the oil chamber, in the axial direction of the rotating shaft member.

3. A rotary machine comprising:
the vertical bearing device according to claim 1 ; and
a rotor that has at least one end in the axial direction of the rotating shaft member supported by the vertical bearing device.

4. The vertical bearing device according to claim 1 , wherein
the cooling part has a straightening vane provided on an inlet side, where air flows into the radiation portion, the straightening vane aligning the air flow.

5. The vertical bearing device according to claim 1 , further comprising a shielding plate provided between the cooling part and the casing, the shielding plate blocking transmission of heat from the cooling part to the casing.

6. A vertical bearing, comprising:
a rotating shaft extending in an axial direction and defining a radial direction;
a thrust collar rotating with the rotating shaft;
a base plate facing a lower end of the thrust collar;
a thrust bearing disposed where the thrust collar and the base plate face each other, wherein the thrust bearing supports the rotating shaft in the axial direction;
a casing surrounding the rotating shaft;
an oil chamber defined by the casing and the base plate, wherein the oil chamber comprises an upper oil chamber and a lower oil chamber;
a journal bearing disposed where the casing and the thrust collar face each, wherein the journal bearing supports the rotating shaft in the radial direction;
a cooling portion disposed exteriorly to an outer surface of the casing, wherein the cooling portion comprises a lubricating oil passage and a radiation portion;
a cover forming, with the casing, a space through which the air flows; and
a flat portion disposed circumferentially on the casing;
wherein the cooling portion is disposed on the flat portion,
wherein lubricating oil flows through the lubricating oil passage from the upper oil chamber to the lower oil chamber,
wherein the cooling portion cools the lubricating oil via heat transfer with air surrounding the lubricating oil passage,
wherein the radiation portion is tilted relative to the axial direction by an angle of more than 0 degrees and no more than 90 degrees,
wherein the cooling portion includes an air inlet that is positioned within a preset range,
wherein a distance h is defined between an upper end and a lower end of the oil chamber,
wherein a distance a is defined between the outer surface of the casing and an inner surface of the cover,
wherein the preset range is selected so that a center of the air inlet is positioned ¼h to ¾h axially downward from the upper end of the oil chamber, and
wherein the preset range is selected so that the center of the air inlet is positioned ½a to 3/2a radially outward from the outer surface of the casing.

Assignees

• Daido Metal Co

Inventors

• Na Kwangik
• Yamada Motohira
• Mori Shigeyoshi

Classifications

• F16N7/20

  with one or more members moving around the shaft to be lubricated · CPC title

• H02K7/14 Primary

  Structural association with mechanical loads, e.g. with hand-held machine tools or fans (with fan or impeller for cooling the machine H02K9/06) · CPC title

• F16C17/243

  related to temperature and heat, e.g. for preventing overheating · CPC title

• F16C2380/26

  Dynamo-electric machines or combinations therewith, e.g. electro-motors and generators · CPC title

• F16C17/02

  for radial load only · CPC title