Sealing device and rotating machine

• US 10,641,278 B2
• Filed: 01/18/2016
• Issued: 05/05/2020
• Est. Priority Date: 01/18/2016
• Status: Active Grant

• Current Assignee: Mitsubishi Heavy Industries Compressor Corporation (Mitsubishi Heavy Industries, Ltd.)
• Original Assignee: Mitsubishi Heavy Industries Compressor Corporation (Mitsubishi Heavy Industries, Ltd.)
• Inventors: Urushidani, Hiroki
• Primary Examiner(s): Lee, Gilbert Y
• Application Number:
  US15/778,909
• Publication Number:
  US 20180355880A1
• Time in Patent Office: 1,569 Days
• CPC Class Codes: F04D 17/122 the individual rotor discs being, one for each stage, on a common shaft and axially spaced, e.g. conventional centrifugal multi- stage compressors
• CPC Class Codes: F04D 29/056 Bearings
• CPC Class Codes: F04D 29/06 Lubrication F04D13/0606, F04D13/0646, F04D13/0653 take precedence
• CPC Class Codes: F04D 29/102 especially adapted for elastic fluid pumps
• CPC Class Codes: F04D 29/12 using sealing-rings
• CPC Class Codes: F16B 33/004 Sealing; Insulation by means of washers F16B43/001
• CPC Class Codes: F16J 15/3464 Mounting of the seal
• CPC Class Codes: F16J 15/447 Labyrinth packings

Abstract

A sealing device includes: a sealing body that seals a gap between a rotor and the sealing body; a fastening bolt that fixes the sealing body to a stator; and a bolt sealing part that seals a gap around the fastening bolt. The sealing body includes: a facing surface that faces a fixing surface of the stator facing in an axial direction; and a body through-hole that penetrates the sealing body and opens on the facing surface. The bolt sealing part is disposed in a gap between a head portion and the inner peripheral surface of the body through-hole, or between the fixing surface and the facing surface.

Claims

1. A sealing device disposed between a rotor extending along an axis as a center and a stator disposed on an outer peripheral side of the rotor, the sealing device comprising:

a sealing body that seals a gap between the rotor and the stator;

a fastening bolt that fixes the sealing body to the stator; and

a bolt sealing part that covers a central axis of the fastening bolt and seals a gap around the fastening bolt,

wherein the sealing body comprises;

a facing surface facing a fixing surface of the stator in a direction along the axis; and

a body through-hole in the sealing body that opens on the facing surface,

wherein a head portion of the fastening bolt is inserted into the body through-hole and a tip portion of the fastening bolt is fixed to a fixing hole on the fixing surface,

wherein the bolt sealing part is disposed in at least one of a gap between the head portion and an inner peripheral surface of the body through-hole and a gap between the fixing surface and the facing surface, and

wherein the fastening bolt comprises;

a sealing washer sealing between the head portion and a surface of the sealing body where the body through-hole is disposed.

2. The sealing device according to claim 1, wherein the bolt sealing part is an O-ring fixed to the head portion.

3. The sealing device according to claim 1, further comprising a ring member, the ring member comprising:

a first ring-facing surface facing the facing surface;

a second ring-facing surface facing the fixing surface; and

a ring through-hole,

wherein the fastening bolt is inserted in the ring through-hole and penetrates toward the second ring-facing surface from the first ring-facing surface,

wherein the bolt sealing part is disposed between the facing surface and the first ring-facing surface, and between the fixing surface and the second ring-facing surface.

4. The sealing device according to claim 3, further comprising:

a stop ring that positions the seal body in the axial direction with respect to the stator,

wherein the ring member is disposed radially inward with respect to the stop ring.

5. A rotating machine comprising:

the stator;

the rotor that rotates in the stator; and

the sealing device according to claim 1.