Axial flow expander

Patent metadata

Field	Value
Publication number	US-2016153293-A1
Application number	US-201414900555-A
Country	US
Kind code	A1
Filing date	Jun 27, 2014
Priority date	Jun 28, 2013
Publication date	Jun 2, 2016
Grant date	—

Abstract

The axial flow expander includes: an outer casing provided with a suction port and a discharge port through which gas is discharged from the outer casing; an inner casing inside which a gas passage is formed and which is provided with a first communication portion which communicates the gas passage with the suction port and a second communication portion which communicates the gas passage with the discharge port; a rotor shaft which extends in the direction along an axis; a bearing configured to bear the rotor shaft; stator vanes which protrudes inward from an inner periphery of the inner casing; and moving blades which protrudes outward from the rotor shaft. The inner casing; the rotor shaft, the bearing, the stator vanes, and the moving blades are integrally assembled, and the assembled members are inserted into the outer casing.

First claim

What is claimed is:

1 . An axial flow expander for expanding gas flowed in a direction along an axis thereof, comprising:
a cylindrical shaped outer casing centered around the axis, and provided with a suction port through which the gas is suctioned into the outer casing and a discharge port formed in both ends of the outer casing with respect to the suction port, wherein the gas is discharged from the outer casing through both ends thereof; a cylindrical shaped inner casing centered around the axis, fixed inside the outer casing, and inside which a gas passage is formed, wherein the inner casing is provided with a first communication portion which communicates the gas passage with the suction port and a second communication portion which communicates the gas passage with the discharge port; a rotor shaft accommodated inside the inner casing, and of which an axial center is aligned with the axis so as to extend in the direction along the axis; a bearing fixed to the inner casing, and configured to bear the rotor shaft so as to be available to rotate around the axis with respect to the inner casing; a plurality of stator vanes fixed to the inner casing so as to protrude inward from an inner periphery of the inner casing, and arranged inside the gas passage so as to be separated at intervals in the direction of the axis; and a plurality of moving blades fixed to the rotor shaft so as to protrude outward from the rotor shaft, and arranged inside the gas passage so as to be alternating with the plurality of stator vanes; wherein the inner casing, the rotor shaft, the bearing, the stator vanes, and the moving blades are integrally assembled, and the assembled members are inserted into the outer casing in the direction along the axis.

2 . The axial flow expander according to claim 1 , wherein the inner casing comprises:
an inner casing body having the stator vanes, in which the first and second communication portions are formed; and a head member fixed to both ends of the inner casing body in the direction of the axis, and to which the bearing is fixed.

3 . The axial flow expander according to claim 2 , wherein the inner casing body comprises:
a main body having the stator vanes, in which the first communication portion is formed; and a connection portion fixed to both ends of the main body in the direction of the axis, to which the head member is fixed, and in which the second communication portion is formed.

4 . The axial flow expander according to claim 3 , wherein the connection portion comprises:
an annular projection projecting in one direction along the axis from an end surface of the connection portion which faces in one direction along the axis; and an annular recessed portion formed on a surface of the main body which faces the other direction along the axis so as to dent in one direction along the axis, and to which the projection is fitted.

5 . The axial flow expander according to one of claims 2 to 4 , wherein the head member comprises a discharging guide member fixed to an end surface of the head member so as to be positioned in the gas passage, and which has a guiding surface formed so as to lead the gas to the second communication portion, and wherein
the guiding surface is inclined radially outward as separate from a middle of the head member in the direction of the axis.

Assignees

• Mitsubishi Heavy Ind Compressor Corp

Inventors

• Mori Kazushi
• Nagao Hideki

Classifications

• F01D25/24

  Casings (modified for heating or cooling F01D25/14); Casing parts, e.g. diaphragms, casing fastenings (casings for rotary machines or engines in general F16M {; special arrangements in stators dealing with breaking-off of part of rotor F01D21/045}) · CPC title

• F01D9/04 Primary

  forming ring or sector · CPC title

• F01D5/12

  Blades ({specially adapted for radial flow machines or engines F01D5/04}; blade roots F01D5/30; rotors with blades adjustable in operation F01D7/00; stator blades F01D9/02) · CPC title

• F01D25/26 Primary

  Double casings; Measures against temperature strain in casings · CPC title

• F05D2230/70

  Disassembly methods · CPC title