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Oil-free lubrication high-power-density zero-steam-leakage steam turbine

A technology with high power density and oil-free lubrication, applied in the field of steam turbines, it can solve the problems of low power density, large volume and weight of steam turbines, and large bearing span.

Active Publication Date: 2021-07-06
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention solves the problems of complex sealing structure and air extraction device between the impeller and the bearing box of the existing steam turbine, resulting in large bearing span, large volume and weight of the steam turbine, and low power density, and further provides an oil-free lubricated high-power Density Zero Steam Leakage Turbine

Method used

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  • Oil-free lubrication high-power-density zero-steam-leakage steam turbine
  • Oil-free lubrication high-power-density zero-steam-leakage steam turbine
  • Oil-free lubrication high-power-density zero-steam-leakage steam turbine

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specific Embodiment approach 1

[0028] Specific implementation mode one: as Figure 1~5 As shown, the oil-free, high-power-density, zero-steam-leakage steam turbine of this embodiment includes a cylinder 1 and a rotor 4, and the low-pressure end of the rotor 4 is connected to the generator through a magnetic coupling. The oil-free, high-power-density, zero-steam leakage steam turbine It also includes a radial air bearing 3 at the high pressure end, a radial air bearing 6 at the low pressure end, and two static pressure thrust air bearings 2. The two static pressure thrust air bearings 2 are installed side by side on the high pressure side of the cylinder 1. Two The static pressure thrust air bearing 2 is integrated with the inner wall of the cylinder 1, the radial air bearing 3 at the high pressure end and the radial air bearing 6 at the low pressure end are embedded in the cylinder 1, and the radial air bearing 6 at the low pressure end is installed in the cylinder On the low pressure side of 1, the radial ...

specific Embodiment approach 2

[0030] Specific implementation mode two: as figure 1 As shown, in this embodiment, the wall surfaces of the radial air bearing 3 at the high pressure end, the radial air bearing 6 at the low pressure end, and the two static pressure thrust air bearings 2 are soft copper graphite layers.

[0031] Such a design can effectively avoid the leakage of high temperature and high pressure steam.

[0032] Other components and connections are the same as those in the first embodiment.

specific Embodiment approach 3

[0033] Specific implementation mode three: as Figure 1~3 As shown, in this embodiment, the outer ring surface of the radial air bearing 3 at the high pressure end is processed with a first annular chamber along its circumferential direction, and the inner wall surface of the radial air bearing 3 at the high pressure end is processed with several radial chambers along its radial direction. A first stepped through hole, the first annular chamber communicates with the outer wall of the rotor 4 through several first through holes, the cylinder 1 is processed with a steam inlet 8 of the high pressure end radial air bearing, and the high pressure end radial air bearing The steam inlet 8 communicates with the first annular chamber.

[0034] With such a design, the high-temperature and high-pressure steam flows out from the first step through hole on the inner wall of the radial static pressure air bearing at the high pressure end, and forms a steam film with the rotor, and the low-t...

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Abstract

The invention discloses an oil-free lubrication high-power-density zero-steam-leakage steam turbine, and relates to a steam turbine. The problems that the bearing span is large, the size and weight of a turbine are large and the power density is low due to the fact that a complex sealing structure and an air extractor are arranged between an impeller and a bearing box of an existing turbine are solved. Two static pressure thrust steam floating bearings are installed at the high-pressure side of an air cylinder in parallel, the two static pressure thrust steam floating bearings and the inner wall of the air cylinder are of an integrated structure, a high-pressure end radial steam floating bearing and a low-pressure end radial steam floating bearing are embedded in the air cylinder, and the low-pressure end radial steam floating bearing is installed at the low-pressure side of the air cylinder. The high-pressure end radial steam floating bearing is installed at the high-pressure side of the air cylinder and is close to the static pressure thrust steam floating bearings, a central through hole is machined in a rotor in the axis direction of the rotor, and the rotor is supported through the high-pressure end radial steam floating bearing, the low-pressure end radial steam floating bearing and the two static pressure thrust steam floating bearings and forms a completely-closed structure with the air cylinder. The zero-steam-leakage steam turbine is achieved.

Description

technical field [0001] The invention relates to a steam turbine with oil-free lubrication, high power density and zero steam leakage, belonging to the technical field of steam turbines. Background technique [0002] Traditional steam turbines use oil-lubricated sliding bearings, which require a separate lubricating oil circulation system. At the same time, steam leakage will occur in the dynamic and static gaps. In order to reduce the leakage of high-temperature and high-pressure steam at the inlet, there are complex sealing structures and air extraction devices between the impeller and the bearing housing, resulting in bearing The span is large, the volume and weight of the steam turbine are large, and the power density is low. [0003] In summary, the existing steam turbine impeller and bearing housing have complex sealing structures and air extraction devices, resulting in large bearing spans, large volume and weight of steam turbines, and low power density. Contents of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01D1/20F01D25/16F01D11/00F01D25/24
CPCF01D1/20F01D25/16F01D11/003F01D25/24
Inventor 刘占生于香宇
Owner HARBIN INST OF TECH