Fixation device for turbine and method for applying fixation

Patent metadata

Field	Value
Publication number	US-9890658-B2
Application number	US-201414445130-A
Country	US
Kind code	B2
Filing date	Jul 29, 2014
Priority date	Aug 15, 2013
Publication date	Feb 13, 2018
Grant date	Feb 13, 2018

Abstract

The invention provides a fixation device for a turbine, including a flange mounted on a housing of the turbine and a nut assembly received in the flange to apply fixation to an component inside the housing. The flange is fixed to the housing by a plurality of first bolts and comprises a central threaded hole. The nut assembly comprises a nut body with a first hole formed along the central axis of the nut body and a plurality of second holes formed around the central axis, and a plurality of second bolts received in the respective second holes. The nut body is formed with thread on its outer circumferential surface and fitted within the central threaded hole of the flange. The second bolts are screwed in the second holes to apply fixation against the component inside the housing of the turbine. The nut assembly further comprises a plurality of sleeves received in the respective second holes, and the plurality of second bolts are received in the respective sleeves. The fixation device in the present invention is able to apply for small and restricted space condition, which makes it possible to position the device very close to the split plane of the turbine. Further, the whole structure of the fixation device is simple with lightweight and easy to assemble with standard tools.

First claim

The invention claimed is:

1. A fixation device for a turbine, comprising:
a flange mounted on a housing of the turbine; and
a nut assembly received in the flange to apply fixation to a component inside the housing, wherein the flange is fixed to the housing by a plurality of first bolts and includes a central threaded hole, and wherein the nut assembly includes a nut body with a first hole formed along the central axis of the nut body and a plurality of second holes formed around the central axis, and a plurality of second bolts received in the respective second holes, wherein the nut body is formed with the thread on its outer circumferential surface and fitted within the central threaded hole of the flange, and the second bolts are screwed in the second holes to apply fixation against the component inside the housing of the turbine, wherein the nut assembly includes a plurality of sleeves received in the respective second holes, and the plurality of second bolts are received in the respective sleeves, wherein the sleeves include an inner thread proximate the inlet opening for the second bolt, and
a collar at one end distal to the inlet opening for the second bolt.

2. The fixation device of claim 1 , wherein the collar of the sleeve is welded to the nut body.

3. The fixation device of claim 1 , wherein the second bolt comprises:
a threaded section to fit with the inner thread of the sleeve and a pressing section to abut and apply fixation on the component inside the housing.

4. The fixation device of claim 3 , wherein the diameter of the pressing section is smaller than that of the threaded section.

5. The fixation device of claim 1 , wherein the first hole of the nut body is a hexagonal hole to receive an assembly tool to screw up the nut assembly relative to the flange.

6. A method for applying fixation to a component inside a housing of a turbine with the fixation device of claim 1 , the method comprising:
a. mounting the flange on the housing through the plurality of first bolts;
b. screwing up the nut assembly into the central threaded hole of the flange; and
c. tightening the second bolts to apply fixation to the component inside the housing.

Assignees

• Alstom Technology Ltd
• Ansaldo Energia Switzerland AG

Inventors

• Gerzner Stefan
• Rauch Marc

Classifications

• F01D25/28

  Supporting or mounting arrangements, e.g. for turbine casing · CPC title

• 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

• F16J13/12

  attached by wedging action by means of screw-thread, interrupted screw-thread, bayonet closure, or the like · CPC title

• F16B31/043

  Prestressed connections tensioned by means of liquid, grease, rubber, explosive charge, or the like (hydraulic bolt tensioners B25B29/02) · CPC title

• Y10T29/4932

  Turbomachine making · CPC title