DE-112024003159-T5 - lathe

DE112024003159T5DE 112024003159 T5DE112024003159 T5DE 112024003159T5DE-112024003159-T5

Abstract

This lathe comprises a rotating part, a stationary part surrounding the rotating part, and a sealing device for reducing fluid leakage through a gap between the rotating part and the stationary part. The sealing device includes: a sealing element positioned in a gap between the rotating part and the stationary part; and a first preloading element for preloading the sealing element to the outside in the radial direction of the lathe. The inner circumferential surface of the stationary part has a first groove extending along the circumferential direction of the lathe and a second groove positioned upstream of the first groove in the axial direction of the lathe, also extending along the circumferential direction. A first support part, which is able to support the sealing element, is formed on a side surface of the first groove, and a second support part, which is able to support the sealing element, is formed on a side surface of the second groove.

Inventors

Azumi Yoshida
Masaya Kawano
Hideo Yamamoto
Ryuji Iwamoto
Kenichi Sakashita
Shin Nishimoto
Tatsuro Furusho
Shintaro Okumura

Assignees

MITSUBISHI HEAVY INDUSTRIES, LTD.

Dates

Publication Date: 20260513
Application Date: 20240731
Priority Date: 20230929

Claims (6)

Lathe, comprising: a rotating section; a stationary section surrounding the rotating section; and a sealing device for reducing fluid leakage via a gap between the rotating section and the stationary section, the sealing device comprising: a sealing element provided in the gap between the rotating section and the stationary section, and a first preloading element that preloads the sealing element towards an outside in a radial direction of the lathe, formed on an inner circumferential surface of the stationary section: a first groove extending along a circumferential direction of the lathe, and a second groove positioned on an upstream side of the first groove in an axial direction of the lathe and extending along the circumferential direction, a first support section capable of supporting the sealing element formed on a side surface of the first groove, and a second support section capable of supporting the sealing element formed on a side surface of the second groove.
lathe according to Claim 1 , wherein the first support section projects from a side surface of the first groove on the upstream side in the axial direction to a downstream side in the axial direction, and the second support section projects from a side surface of the second groove on the upstream side in the axial direction to the downstream side in the axial direction.
lathe according to Claim 2 , wherein the sealing element comprises: a sealing element main body section arranged along the circumferential direction such that it faces an outer circumferential surface of the rotating section, a first radial projection section extending radially from an outer circumferential surface of the sealing element main body section to the outside, a first axial projection section extending axially from a side face of the first radial projection section on the upstream side to the upstream side, a second radial projection section positioned axially on an upstream side of the first radial projection section and extending radially from the outer circumferential surface of the sealing element main body section to the outside, and a second axial projection section extending axially from a side face of the second radial projection section on the upstream side to the upstream side, the first support section on an inner side of the first axial the first protrusion section is positioned in the radial direction, and the second support section is positioned on an inside of the second axial protrusion section in the radial direction.
lathe according to Claim 3 , wherein the sealing device includes a first retaining element for supporting the sealing element so that it is movable along the radial direction, the first retaining element having: a base section which is received in the first groove, and an inner projection section which projects from the base section to an inside in the radial direction, and the first radial projection section having a sliding surface which is adjacent in the axial direction to the inner projection section and which is slidable with the inner projection section.
lathe according to Claim 4 , wherein the first preloading element is incorporated in the first retaining element and is configured to preload the sealing element towards the outside in the radial direction.
lathe according to Claim 5 , wherein the sealing device comprises: a second retaining element, which is at least partially received in the second groove and which serves to support the sealing element so that it is movable along the radial direction, and a second preloading element, which is received in the second retaining element and which is configured to preload the sealing element towards the outside in the radial direction, the second retaining element having: a base section which is received in the second groove, and an inner projecting section which projects from the base section towards the inside in the radial direction, and a gap between the second radial projecting section and the inner projecting section of the second retaining element in at least is provided for in part of an area in the circumferential direction.

Description

Technical field The present disclosure relates to a lathe. The present application claims priority based on Japanese patent application no. 2023-170361 , which was submitted in Japan on September 29, 2023, and whose contents are included here by reference. State of the art As a sealing device for reducing fluid leakage via a gap between a rotating section and a stationary section of a lathe, such as a gas turbine and a steam turbine, in some cases a sealing device with a structure is used in which a sealing element is movable along a radial direction in accordance with an operating condition or the like of the lathe. PTL 1 describes a sealing device comprising an arc-shaped segment having a predetermined axial dimension and carrying several sealing teeth spaced apart from one another in an axial direction and extending in a circumferential and a radial direction, and at least one series of stiff bristles extending in the circumferential direction being carried by the segment at a predetermined axial position along the segment and projecting beyond a radial dimension of the teeth, the stiff bristles being held in a first flexible carrier strip which is slidably and removably supported in a slot provided in the segment. List of citations Patent literature [PTL 1] Japanese unexamined patent application publication no. 11-201293 Summary of the invention Technical problem However, if an area where a sealing element is provided is widened in the axial direction of the lathe, fluid leakage via a gap between a rotating section and a stationary section can be reduced. The sealing element, however, can be deformed by bending due to pressure received by the sealing element, and there are concerns that the sealing element may come into contact with a rotor. In this respect, PTL 1 does not disclose any knowledge on reducing the risk of contact between the rotor and the sealing element caused by bending deformation of the sealing element. In view of the circumstances described above, an object of at least one embodiment of the present disclosure is to provide a lathe that can reduce the risk of contact between a sealing element and a rotor, while reducing fluid leakage via a gap between a rotating section and a stationary section. Solution to the problem According to at least one embodiment of the present disclosure, a lathe comprises, in order to achieve the above task: a turning section; a stationary section surrounding the rotating section; and a sealing device for reducing fluid leakage via a gap between the rotating section and the stationary section, the sealing device includes: a sealing element provided in the gap between the rotating section and the stationary section, and a first preloading element that preloads the sealing element towards an outside in a radial direction of the lathe, are formed on an inner circumferential surface of the stationary section: a first groove extending along a circumferential direction of the lathe, and a second groove, which is positioned on an upstream side of the first groove in an axial direction of the lathe and extends along the circumferential direction, a first support section, capable of supporting the sealing element, is formed on a side surface of the first groove, and A second support section, capable of supporting the sealing element, is formed on a side surface of the second groove. Advantageous effects of the invention According to at least one embodiment of the present disclosure, the lathe is provided which can reduce the risk of contact between the sealing element and the rotor, while reducing fluid leakage via the gap between the rotating section and the stationary section. Brief description of the drawings 1 is a schematic partial sectional view of a lathe 1A according to an embodiment, which is perpendicular to an axial direction.2A Figure 1 is a schematic sectional view of a sealing device 10A during start-up and shutdown procedures and during interruption of operation of the lathe 1A and is a view showing a section along line AA of 1 shows.2B Figure 1 is a schematic sectional view of the sealing device 10A during a load operation of the lathe 1A and is a view showing a section along line AA of 1 shows.3A is a schematic sectional view of the sealing device 10A during the start-up and shutdown procedures and during the operational interruption of the lathe 1A and is a view showing a section along line BB of 1 shows.3B Figure 1 is a schematic sectional view of the sealing device 10A during load operation of the lathe 1A and is a view showing a section along line BB of 1 shows.4 is a schematic partial sectional view of a lathe 1B according to a further embodiment, which is perpendicular to the axial direction.5A is a schematic sectional view of the sealing device 10B during the start-up and shutdown procedures and during the operational interruption of the lathe 1B and is a view showing a section along line CC of 4 shows.5B Figure 1 is a schematic sectional view