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Axial Compressor

a compressor and axial technology, applied in the direction of efficient propulsion technologies, machines/engines, liquid fuel engines, etc., can solve the problems of degrading affecting the reliability of the variable stator vane device, and not very much thought given to improving sealing performance. , to achieve the effect of improving the reliability of the axial compressor

Inactive Publication Date: 2015-01-29
MITSUBISHI HITACHIPOWER SYST LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention aims to prevent fluid leakage from the sliding portion between the variable stator vane and the casing of an axial compressor. This improves the reliability of the compressor and prevents damage to the vane and casing.

Problems solved by technology

Unfortunately, however, considerations are not very much given to improving sealing performance in the sliding portion between the variable stator vane and the casing.
As a result, when water or other fluid droplets are to be sprayed inside the compressor having the variable stator vanes, in particular, droplets may leak from the variable stator vane mechanism to the outside of the casing due to a difference in pressure between the inside and outside of the casing.
In addition, on a long-term perspective, rust may gather as a result of corrosion on the sliding portion between the rotational shaft of the variable stator vanes and the casing surface, resulting overall in degraded device reliability of the variable stator vane.

Method used

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Examples

Experimental program
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Effect test

first embodiment

[0041]A detailed structure of the variable stator vane 56 in the compressor according to the present invention will be described below with reference to FIG. 3. In FIG. 3, the variable stator vane 56 includes the vane section 72, the stator vane base 81, the stem section 94, and a bolted stem section 89. Preferably, the vane section 72, the stator vane base 81, the stem section 94, and the bolted stem section 89 are integrally molded using, for example, casting.

[0042]The stem section 94 has a cylindrical shape and is inserted in a cylindrical through hole 73 formed radially relative to the casing 54. The stem section 94 assumes a rotational shaft of the variable stator vane 56. Rotating the stem section 94 about an axial center thereof varies the angle of attack of the vane section 72.

[0043]In the example shown in FIG. 3, the stem section 94 is inserted in the through hole 73 in the casing 54 after a thrust washer 82 is inserted. The thrust washer 82 is disposed between the stator v...

second embodiment

[0068]The configuration in the second embodiment results in the wear-resistant coating surface disposed on the side of the thrust washer 82 adjacent to the stator vane base 81 being in contact with the sealing member 92. This reduces the likelihood that the sealing member 92 will be worn and damaged, so that a risk of occurrence of drain can be reduced. The configuration also minimizes friction of the sliding portion between the sealing member 92 and the thrust washer 82, which allows accuracy in the opening degree of the variable stator vane to be maintained.

[0069]The first and second embodiments have been described with reference to FIGS. 3 and 4. The sealing groove 93 may still be formed in both the stator vane base 81 and the inner peripheral surface of the casing 54 so that the sealing member 92 can be mounted in both the surface on the inside and the surface on the outside in the rotor radial direction of the thrust washer 82.

[0070]In the first and second embodiments, the thru...

third embodiment

[0074]When the sealing member 92 is to be replaced with a new one in the compressor shown in FIG. 3 or 4, access to the sealing member 92 can only be gained after the variable stator vane 56 or 56A is removed from the inner peripheral side of the casing 54, which makes it necessary to disassemble the casing 54. As a result, the sealing member 92 is replaced only at a periodic inspection of the gas turbine. The configuration however, enables the sealing member 92B to be removed from the outside of the casing 54. Thus, when the sealing member 92B is worn and damaged, the sealing member 92B can be replaced with a new one without having to disassemble the casing 54. This improves maintainability.

[0075]Each of the first to third embodiments of the present invention described heretofore can prevent leakage of droplets occurring from the sliding portion of the variable stator vane in the axial compressor that has the intermediate cooling effect from spraying of the droplets over the intak...

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Abstract

An axial compressor includes: a spray nozzle (32) that supplies droplets to a working fluid before compression or being compressed; a variable stator vane (56) having a stem section (94) inserted in an insertion hole (73) in a casing (54), the variable stator vane (56) having an angle of attack varied through sliding motion relative to the casing caused by rotation of the stem section; a sealing groove (93) provided in a sliding portion between a thrust washer (82) slid relative to the casing during rotation of the stem section and the casing; and a sealing member (92) housed in the sealing groove.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to an axial compressor for a gas turbine or an industrial use.[0003]2. Description of the Related Art[0004]Operating a gas turbine in, for example, summer results in a reduced gas turbine output due to a drop in inlet air density at a high atmospheric temperature. To solve this problem of the reduced output, a known method sprays water or other fluid droplets over inlet air of the compressor using a spray nozzle to thereby increase the inlet air density, thus improving the gas turbine output through an effect of inlet air cooling. In addition, with the droplets introduced into an inside of the compressor by increasing an amount of sprayed droplets, an effect of intermediate cooling reduces compressor work to thereby improve gas turbine efficiency. The fine droplets conveyed with an airflow into the inside of the compressor vaporize up to a saturation temperature of a stage while passing thr...

Claims

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Application Information

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IPC IPC(8): F04D29/56F04D29/08F04D19/02F04D29/58
CPCF04D29/563F04D19/028F04D29/083F04D29/582F01D11/003F01D17/162F02C7/1435F04D29/5846F04D29/705Y02T50/60
Inventor TAKAHASHI, YASUOMYOREN, CHIHIROKAWAMURA, KOHTA
Owner MITSUBISHI HITACHIPOWER SYST LTD
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