Steam turbine

A technology of steam turbines and impellers, applied in mechanical equipment, engine components, machines/engines, etc., can solve problems such as unclear steam piping cooling passages through the casing, difficult direct connection of steam piping, and inability to ensure the uniformity of cooling steam pressure. , to achieve the effect of improving thermal efficiency

Inactive Publication Date: 2011-07-20
KK TOSHIBA
View PDF9 Cites 11 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, in the above patent document 1 figure 1 In the case of the case, it is not clear whether the steam piping that penetrates the shell penetrates into the partition or forms a cooling passage different from the partition
It is difficult to directly connect the steam pipe to the blowout hole and supply cooling steam to the blowout hole at a uniform pressure
exist image 3 In the example, no steam piping is provided for each stationary blade, and there is a circumferential direction flow path of cooling steam, and the cooling steam from the blowing hole is intended to flow uniformly into the root of the moving blade, but the pressure of the cooling steam cannot be ensured to be sufficient for each blowing hole. Uniformity of

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Steam turbine
  • Steam turbine
  • Steam turbine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0023] figure 1 It is an axial sectional view showing the steam turbine according to Embodiment 1 of the present invention.

[0024] exist figure 1 In , the right side of the main steam passage portion 31 is upstream, and the left side is downstream. The stationary side of the steam turbine is composed of an outer casing 1 , an inner casing 2 , and partitions 3 of various stages. The partitions 3 include an outer ring 4 , a plurality of stationary blades 5 and an inner ring 6 . The rotating side is constituted by an impeller-type rotor 7 in which rotor impellers 8 are formed in stages, and a plurality of moving blades 9 implanted and fixed on the rotor impellers 8 . In addition, the space between the inner ring 6 and the front and rear rotor wheels 8 forms the wheel space 11a, 11b, and the wheel space sealing parts 12a, 12b such as sealing sheets are used between this space and the main steam passage part 31 to prevent the main steam from flowing into the wheel space. 11a, ...

Embodiment approach 2

[0048] image 3 It is an axial sectional view showing a steam turbine according to Embodiment 2 of the present invention.

[0049] In Embodiment 1, cooling steam is supplied to the outer ring cavity 15 at each stage to cool the outer ring cavity 15 independently; however, in this embodiment, the cooling steam supplied to the upstream stage is also configured to perform cooling on the adjacent downstream stage. Stage cooling, the purpose of which is to simplify the structure.

[0050] The configuration of the stage to which cooling steam is supplied from the outer ring side is the same as that of Embodiment 1, and is supplied from the balance hole 20 provided in the moving blade fixing portion to the impeller space 11a' on the upstream side of the stator blade of the downstream stage. In addition, the inner ring 6 has bidirectional blowout holes 18 a and 18 b directed toward the wheel space 11 a on the upstream side of the stator blades and the wheel space 11 b on the downstre...

Embodiment approach 3

[0055] Figure 4 It is an axial sectional view showing a steam turbine according to Embodiment 3 of the present invention.

[0056] In this embodiment, compared to the above-mentioned second embodiment, instead of the balance hole 20, a plurality of internal rotor communication holes 21 are provided in the rotor over the entire circumference in the circumferential direction. It communicates with the wheel space 11a' on the upstream side of the stator blades of the adjacent downstream stage. In addition, the outlet hole 18b on the wheel space 11b side on the downstream side of the stator vane in Embodiment 2 can be omitted.

[0057] Next, the operation of this embodiment will be described.

[0058] Part of the cooling steam directly flows from the wheel space 11a on the upstream side of the stator blades to the wheel space 11a' on the upstream side of the stator blades on the downstream stage, and cools the rotor 7 on the downstream stage in the same manner as in the second e...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The present invention provides a steam turbine that supplies cooling steam at more uniform pressure to a blowing hole of the inner ring of a diaphragm to further increase thermal efficiency. An outer ring for forming a diaphragm of the steam turbine comprises a first outer ring. The first outer ring has an annular outer ring cavity to which external cooling steam is supplied. A radial direction cooling hole connecting with the outer ring cavity is formed in the stator blades connected to the first outer ring. An annular inner ring cavity connecting with the radial direction cooling hole is formed in a first inner ring constituting one diaphragm together with the first outer ring. Cooling steam blowing holes connecting an annular wheel space and the inner ring cavity are formed. The annular wheel space is formed between the first inner ring and a rotor wheel adjacent to the first inner ring.

Description

technical field [0001] The present invention relates to a steam turbine provided with a mechanism for cooling a rotor by supplying cooling steam from the outside. Background technique [0002] Ferritic heat-resistant steel, which is good in manufacturability and economy, has been used in most high-temperature parts of thermal power generation equipment. In steam turbine power generation equipment, since the steam temperature is generally below 600°C, ferritic heat-resistant steel is also used in major parts such as rotors and blades of steam turbines. However, in recent years, with the background of environmental protection, the efficiency of thermal power generation equipment has been actively developed, and steam turbines using high-temperature steam at about 600°C are in operation. Some of these steam turbines are made of ferritic heat-resistant steel. Parts whose various characteristics cannot meet the required characteristics. [0003] Therefore, there are also exampl...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): F01D5/08F01D17/10
CPCF01D9/065F05B2220/301F05D2220/31F01D11/04F01D11/001F01D5/081
Inventor 伊藤胜康佐藤岩太郎池田一隆猪亦麻子
Owner KK TOSHIBA
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap