CN109162774B - Internal insulation board for exhaust diffusion section of gas turbine - Google Patents
Internal insulation board for exhaust diffusion section of gas turbine Download PDFInfo
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- CN109162774B CN109162774B CN201811006520.8A CN201811006520A CN109162774B CN 109162774 B CN109162774 B CN 109162774B CN 201811006520 A CN201811006520 A CN 201811006520A CN 109162774 B CN109162774 B CN 109162774B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/30—Exhaust heads, chambers, or the like
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- C09J4/00—Adhesives based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; adhesives, based on monomers of macromolecular compounds of groups C09J183/00 - C09J183/16
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/005—Ferrous alloys, e.g. steel alloys containing rare earths, i.e. Sc, Y, Lanthanides
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/005—Selecting particular materials
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/08—Cooling; Heating; Heat-insulation
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Abstract
The invention relates to an inner heat-insulation plate for an exhaust diffusion section of a gas turbine, and belongs to the technical field of gas turbines. The inner heat-insulation plate for the exhaust diffusion section of the gas turbine comprises an inner protective plate, ceramic fiber cloth, at least two layers of ceramic fiber cotton and an outer protective plate which are sequentially bonded by a binder; the ceramic fiber cloth is formed by interweaving ceramic fiber warp yarns and shaping weft yarns; the inner heat-insulation plate for the exhaust diffusion section of the gas turbine, disclosed by the invention, has the advantages that through the matching of the two metal guard plates, the ceramic fiber cloth and the multilayer ceramic fiber cotton, the corrosion resistance is greatly improved, the heat-insulation performance is improved, the service life of the inner heat-insulation plate is prolonged, the operation cost is reduced, and the heat-insulation performance is improved by 100-fold and 120% relative to the traditional heat-insulation plate.
Description
Technical Field
The invention relates to an inner heat-insulation plate for an exhaust diffusion section of a gas turbine, and belongs to the technical field of gas turbines.
Background
The gas turbine is an internal combustion type power machine which takes continuously flowing gas as a working medium to drive an impeller to rotate at a high speed and converts the energy of fuel into useful work, has the simplest structure and can embody a series of advantages of small volume, light weight, quick start, little or no cooling water and the like which are peculiar to the gas turbine.
In the main flow of air and gas of the gas turbine, only the gas turbine consisting of three parts, namely a compressor, a combustion chamber and a gas turbine, circulates, and is generally called as simple circulation. Most gas turbines use a simple cycle scheme. The air compressor sucks air from the external atmospheric environment, and the air is compressed step by the axial flow type air compressor to be pressurized, and meanwhile, the air temperature is correspondingly increased; compressed air is pumped into a combustion chamber and is mixed with injected fuel to be combusted to generate high-temperature and high-pressure gas; then the gas or liquid fuel enters a turbine to do work through expansion, the turbine is pushed to drive the gas compressor and the external load rotor to rotate at a high speed, the chemical energy of the gas or liquid fuel is partially converted into mechanical work, and electric work is output. The exhaust gas from the turbine is discharged to the atmosphere to release heat naturally. Thus, the gas turbine converts the chemical energy of the fuel into thermal energy and also converts part of the thermal energy into mechanical energy. In a gas turbine, a compressor is driven by a gas turbine to perform work through expansion, and the compressor is a load of the turbine. In a simple cycle, about 1/2 to 2/3 of mechanical work from the turbine is used to drive the compressor, and the remaining about 1/3 of mechanical work is used to drive the generator. When the gas turbine is started, external power is firstly needed, a starter generally drives the gas compressor, and the gas turbine can not work independently until the mechanical power generated by the gas turbine is greater than the mechanical power consumed by the gas compressor and the external starter is tripped.
At present, the insulation board of the exhaust diffusion section of the gas turbine has poor thermal insulation performance and poor corrosion resistance, and the insulation board frequently needs to be replaced and maintained while losing heat, so that the operation cost of the gas turbine is increased.
Disclosure of Invention
The invention aims to solve the technical problem of providing an inner heat-insulating plate for an exhaust diffusion section of a gas turbine, which has good heat-insulating performance and long service life and is used for overcoming the defects of the prior art.
The technical scheme provided by the invention for solving the technical problems is as follows: an inner insulation board for an exhaust diffusion section of a gas turbine comprises an inner protection board, ceramic fiber cloth, at least two layers of ceramic fiber cotton and an outer protection board which are sequentially bonded by a binder; the inner guard plate and the outer guard plate comprise the following chemical components in percentage by mass: c: 0.06-0.09%, Mn: 0.88-1.14%, Al: 2.17-2.56%, Ni: 1.15-1.48%, Mo: 0.15-0.22%, Cr: 0.17-0.23%, Ce: 0.05-0.08%, Eu: 0.26-0.31%, Lu: 0.08-0.15% of Fe, and the balance of Fe;
the ceramic fiber cloth is formed by interweaving ceramic fiber warp yarns and shaping weft yarns; the ceramic fiber warp comprises the following chemical components in percentage by mass: BN: 6.17-8.56%, SiBN: 6.55-9.87%, C: 2.23-3.47% of Al3N4: 6.88-8.79%, AlN: 5.35-7.12%, and the balance of SiC; the shaping weft comprises the following chemical components in percentage by mass: polyester fiber: 12.24-15.56%, polyurethane fiber: 6.11-7.22%, polyacrylonitrile fiber: 3.55 to 4.26 percent of polyvinyl chloride fiber and the balance of polyvinyl chloride fiber;
the ceramic fiber cotton comprises the following chemical components in percentage by mass: aluminum chloride: 4.24-5.15%, silica: 2.17-3.56%, iron oxide: 2.12-2.77%, titanium dioxide: 1.34-5.78%, zirconia: 10.55-13.21%, magnesium chloride: 2.56-2.78%, magnesium oxide: 3.69 to 4.86 percent of alumina, and the balance of alumina.
The improvement of the technical scheme is as follows: the ceramic fiber cotton is six layers.
The improvement of the technical scheme is as follows: the thickness of the three layers of ceramic fiber cotton close to the ceramic fiber cloth is 40 mm.
The improvement of the technical scheme is as follows: the thickness of the three layers of ceramic fiber cotton close to the outer guard plate is 50 mm.
The improvement of the technical scheme is as follows: the thickness of the ceramic fiber cloth is 2 mm.
The improvement of the technical scheme is as follows: the thickness of the inner protective plate is 3mm, and the thickness of the outer protective plate is 10 mm.
The improvement of the technical scheme is as follows: the binder comprises the following components in percentage by mass: polyaluminum chloride: 4.6-6.9%, polyacrylamide: 6.6-7.9%, urethane: 5.5-6.6%, trimethylolpropane trimethacrylate: 3.1-4.4%, butyl acrylate: 3.2-4.1%, 2-hydroxy-1, 2-diphenylethanone: 2.1-3.4%, dimethylformamide: 1.6-1.9% and the balance of vinyl acetate.
The improvement of the technical scheme is as follows: the inner guard plate and the outer guard plate comprise the following chemical components in percentage by mass: c: 0.06%, Mn: 0.88%, Al: 2.17%, Ni: 1.15%, Mo: 0.15%, Cr: 0.17%, Ce: 0.05%, Eu: 0.26%, Lu: 0.08 percent, and the balance being Fe;
the ceramic fiber warp comprises the following chemical components in percentage by mass: BN: 6.17-8.56%, SiBN: 6.55%, C: 2.23% of Al3N4: 6.88%, AlN: 5.35 percent, and the balance of SiC;
the shaping weft comprises the following chemical components in percentage by mass: polyester fiber: 12.24%, polyurethane fiber: 6.11%, polyacrylonitrile fiber: 3.55 percent, and the balance being polyvinyl chloride fiber;
the ceramic fiber cotton comprises the following chemical components in percentage by mass: aluminum chloride: 4.24%, silica: 2.17%, iron oxide: 2.12%, titanium dioxide: 1.34%, zirconia: 10.55%, magnesium chloride: 2.56%, magnesium oxide: 3.69 percent, and the balance being alumina.
The improvement of the technical scheme is as follows: the inner guard plate and the outer guard plate comprise the following chemical components in percentage by mass: c: 0.09%, Mn: 1.14%, Al: 2.56%, Ni: 1.48%, Mo: 0.22%, Cr: 0.23%, Ce: 0.08%, Eu: 0.31%, Lu: 0.15%, the balance being Fe;
the ceramic fiber warp comprises the following chemical components in percentage by mass: BN: 8.56%, SiBN: 9.87%, C: 3.47% of Al3N4: 8.79%, AlN: 7.12 percent, and the balance of SiC;
the shaping weft comprises the following chemical components in percentage by mass: polyester fiber: 15.56%, polyurethane fiber: 7.22%, polyacrylonitrile fiber: 4.26 percent, and the balance being polyvinyl chloride fiber;
the ceramic fiber cotton comprises the following chemical components in percentage by mass: aluminum chloride: 5.15%, silica: 3.56%, iron oxide: 2.77%, titanium dioxide: 5.78%, zirconia: 13.21%, magnesium chloride: 2.78%, magnesium oxide: 4.86 percent and the balance of alumina.
The invention adopts the technical scheme that the method has the beneficial effects that:
(1) the inner heat-insulation plate for the exhaust diffusion section of the gas turbine has the advantages that through the matching of the two metal guard plates, the ceramic fiber cloth and the multilayer ceramic fiber cotton, the corrosion resistance is greatly improved, the heat-insulation performance is improved, the service life of the inner heat-insulation plate is prolonged, the operation cost is reduced, and the heat-insulation performance is improved by 100 plus 120% compared with that of the traditional heat-insulation plate;
(2) according to the invention, rare earth elements are added into the inner and outer guard plates of the inner insulation plate for the exhaust diffusion section of the gas turbine, so that the corrosion resistance and the mechanical property are improved, the middle ceramic fiber cloth and the multilayer ceramic fiber cotton can be effectively protected, and the service life is prolonged;
(3) the magnesium chloride and the magnesium oxide are added into the ceramic fiber cotton of the internal insulation board for the exhaust diffusion section of the gas turbine, so that the ceramic fiber cotton has the characteristics of strong fire resistance, good insulation performance, sound absorption and sound insulation performance;
(4) the inner heat-insulation plate for the exhaust diffusion section of the gas turbine has strong bonding performance of the adopted bonding agent, is not easy to age, and further prolongs the service life of the inner heat-insulation plate.
Drawings
The invention will be further described with reference to the accompanying drawings in which:
FIG. 1 is a schematic structural diagram of an inner insulation panel for a gas turbine exhaust diffuser according to an embodiment of the present invention;
1-inner guard plate, 2-ceramic fiber cloth, 3-ceramic fiber cotton and 4-outer guard plate.
Detailed Description
Example one
The inner heat-insulation plate for the exhaust diffusion section of the gas turbine comprises an inner protective plate 1, ceramic fiber cloth 2, six layers of ceramic fiber cotton 3 and an outer protective plate 4 which are sequentially bonded by a binder; the inner guard plate 1 and the outer guard plate 4 comprise the following chemical components in percentage by mass: c: 0.06%, Mn: 0.88%, Al: 2.17%, Ni: 1.15%, Mo: 0.15%, Cr: 0.17%, Ce: 0.05%, Eu: 0.26%, Lu: 0.08 percent, and the balance being Fe;
the ceramic fiber cloth 2 is formed by interweaving ceramic fiber warp yarns and shaping weft yarns; the ceramic fiber warp comprises the following chemical components in percentage by mass: BN: 6.17-8.56%, SiBN: 6.55%, C: 2.23% of Al3N4: 6.88%, AlN: 5.35 percent, and the balance of SiC;
the shaping weft comprises the following chemical components in percentage by mass: polyester fiber: 12.24%, polyurethane fiber: 6.11%, polyacrylonitrile fiber: 3.55 percent, and the balance being polyvinyl chloride fiber;
the ceramic fiber cotton 3 comprises the following chemical components in percentage by mass: aluminum chloride: 4.24%, silica: 2.17%, iron oxide: 2.12%, titanium dioxide: 1.34%, zirconia: 10.55%, magnesium chloride: 2.56%, magnesium oxide: 3.69 percent, and the balance being alumina.
Wherein the thickness of the three layers of ceramic fiber cotton 3 close to the ceramic fiber cloth is 40 mm. The thickness of the three layers of ceramic fiber cotton 3 close to the outer guard plate is 50 mm. The thickness of the ceramic fiber cloth is 2 mm. The thickness of the inner protective plate is 3mm, and the thickness of the outer protective plate is 10 mm.
The binder comprises the following components in percentage by mass: polyaluminum chloride: 4.6%, polyacrylamide: 6.6%, urethane: 5.5%, trimethylolpropane trimethacrylate: 3.1%, butyl acrylate: 3.2%, 2-hydroxy-1, 2-diphenylethanone: 2.1%, dimethylformamide: 1.6 percent and the balance of vinyl acetate.
Example two
The inner heat-insulation plate for the exhaust diffusion section of the gas turbine comprises an inner protective plate 1, ceramic fiber cloth 2, six layers of ceramic fiber cotton 3 and an outer protective plate 4 which are sequentially bonded by a binder; the inner guard plate 1 and the outer guard plate 4 comprise the following chemical components in percentage by mass: c: 0.09%, Mn: 1.14%, Al: 2.56%, Ni: 1.48%, Mo: 0.22%, Cr: 0.23%, Ce: 0.08%, Eu: 0.31%, Lu: 0.15%, the balance being Fe;
the ceramic fiber cloth 2 is formed by ceramic fiber warp yarns and shapingInterweaving weft yarns; the ceramic fiber warp comprises the following chemical components in percentage by mass: BN: 8.56%, SiBN: 9.87%, C: 3.47% of Al3N4: 8.79%, AlN: 7.12 percent, and the balance of SiC; the shaping weft comprises the following chemical components in percentage by mass: polyester fiber: 15.56%, polyurethane fiber: 7.22%, polyacrylonitrile fiber: 4.26 percent, and the balance being polyvinyl chloride fiber;
the ceramic fiber cotton 3 comprises the following chemical components in percentage by mass: aluminum chloride: 5.15%, silica: 3.56%, iron oxide: 2.77%, titanium dioxide: 5.78%, zirconia: 13.21%, magnesium chloride: 2.78%, magnesium oxide: 4.86 percent and the balance of alumina.
Wherein the thickness of the three layers of ceramic fiber cotton 3 close to the ceramic fiber cloth is 40 mm. The thickness of the three layers of ceramic fiber cotton 3 close to the outer guard plate is 50 mm. The thickness of the ceramic fiber cloth is 2 mm. The thickness of the inner protective plate is 3mm, and the thickness of the outer protective plate is 10 mm.
The binder comprises the following components in percentage by mass: polyaluminum chloride: 6.9%, polyacrylamide: 7.9%, urethane: 6.6%, trimethylolpropane trimethacrylate: 4.4%, butyl acrylate: 4.1%, 2-hydroxy-1, 2-diphenylethanone: 3.4%, dimethylformamide: 1.9 percent, and the balance of vinyl acetate.
The present invention is not limited to the above-described embodiments. All technical solutions formed by equivalent substitutions fall within the protection scope of the claims of the present invention.
Claims (9)
1. An interior heated board for gas turbine exhaust diffuser section which characterized in that: comprises an inner guard plate, ceramic fiber cloth, at least two layers of ceramic fiber cotton and an outer guard plate which are sequentially bonded by a binder; the inner guard plate and the outer guard plate comprise the following chemical components in percentage by mass: c: 0.06-0.09%, Mn: 0.88-1.14%, Al: 2.17-2.56%, Ni: 1.15-1.48%, Mo: 0.15-0.22%, Cr: 0.17-0.23%, Ce: 0.05-0.08%, Eu: 0.26-0.31%, Lu: 0.08-0.15% of Fe, and the balance of Fe;
the ceramic fiber cloth is formed by interweaving ceramic fiber warp yarns and shaping weft yarns; the ceramicThe fiber warp comprises the following chemical components in percentage by mass: BN: 6.17-8.56%, SiBN: 6.55-9.87%, C: 2.23-3.47% of Al3N4: 6.88-8.79%, AlN: 5.35-7.12%, and the balance of SiC; the sizing weft comprises the following chemical components in percentage by mass: polyester fiber: 12.24-15.56%, polyurethane fiber: 6.11-7.22%, polyacrylonitrile fiber: 3.55 to 4.26 percent of polyvinyl chloride fiber and the balance of polyvinyl chloride fiber;
the ceramic fiber cotton comprises the following chemical components in percentage by mass: aluminum chloride: 4.24-5.15%, silica: 2.17-3.56%, iron oxide: 2.12-2.77%, titanium dioxide: 1.34-5.78%, zirconia: 10.55-13.21%, magnesium chloride: 2.56-2.78%, magnesium oxide: 3.69 to 4.86 percent of alumina, and the balance of alumina.
2. The internal insulation panel for a gas turbine exhaust diffuser of claim 1, wherein: the ceramic fiber cotton is six layers.
3. The internal insulation panel for a gas turbine exhaust diffuser of claim 2, wherein: the thickness of the three layers of ceramic fiber cotton close to the ceramic fiber cloth is 40 mm.
4. The internal insulation panel for a gas turbine exhaust diffuser of claim 3, wherein: the thickness of the three layers of ceramic fiber cotton close to the outer guard plate is 50 mm.
5. The internal insulation panel for a gas turbine exhaust diffuser of claim 4, wherein: the thickness of the ceramic fiber cloth is 2 mm.
6. The internal insulation panel for a gas turbine exhaust diffuser of claim 5, wherein: the thickness of the inner protective plate is 3mm, and the thickness of the outer protective plate is 10 mm.
7. The internal insulation panel for a gas turbine exhaust diffuser of claim 6, wherein: the adhesive comprises the following components in percentage by mass: polyaluminum chloride: 4.6-6.9%, polyacrylamide: 6.6-7.9%, urethane: 5.5-6.6%, trimethylolpropane trimethacrylate: 3.1-4.4%, butyl acrylate: 3.2-4.1%, 2-hydroxy-1, 2-diphenylethanone: 2.1-3.4%, dimethylformamide: 1.6-1.9% and the balance of vinyl acetate.
8. The internal insulation panel for a gas turbine exhaust diffuser of claim 7, wherein: the inner guard plate and the outer guard plate comprise the following chemical components in percentage by mass: c: 0.06%, Mn: 0.88%, Al: 2.17%, Ni: 1.15%, Mo: 0.15%, Cr: 0.17%, Ce: 0.05%, Eu: 0.26%, Lu: 0.08 percent, and the balance being Fe;
the ceramic fiber warp comprises the following chemical components in percentage by mass: BN: 6.17-8.56%, SiBN: 6.55%, C: 2.23% of Al3N4: 6.88%, AlN: 5.35 percent, and the balance of SiC;
the sizing weft comprises the following chemical components in percentage by mass: polyester fiber: 12.24%, polyurethane fiber: 6.11%, polyacrylonitrile fiber: 3.55 percent, and the balance being polyvinyl chloride fiber;
the ceramic fiber cotton comprises the following chemical components in percentage by mass: aluminum chloride: 4.24%, silica: 2.17%, iron oxide: 2.12%, titanium dioxide: 1.34%, zirconia: 10.55%, magnesium chloride: 2.56%, magnesium oxide: 3.69 percent, and the balance being alumina.
9. The internal insulation panel for a gas turbine exhaust diffuser of claim 7, wherein: the inner guard plate and the outer guard plate comprise the following chemical components in percentage by mass: c: 0.09%, Mn: 1.14%, Al: 2.56%, Ni: 1.48%, Mo: 0.22%, Cr: 0.23%, Ce: 0.08%, Eu: 0.31%, Lu: 0.15%, the balance being Fe;
the ceramic fiber warp comprises the following chemical components in percentage by mass: BN: 8.56%, SiBN: 9.87%, C: 3.47% of Al3N4: 8.79%, AlN: 7.12 percent, and the balance of SiC;
the sizing weft comprises the following chemical components in percentage by mass: polyester fiber: 15.56%, polyurethane fiber: 7.22%, polyacrylonitrile fiber: 4.26 percent, and the balance being polyvinyl chloride fiber;
the ceramic fiber cotton comprises the following chemical components in percentage by mass: aluminum chloride: 5.15%, silica: 3.56%, iron oxide: 2.77%, titanium dioxide: 5.78%, zirconia: 13.21%, magnesium chloride: 2.78%, magnesium oxide: 4.86 percent and the balance of alumina.
Priority Applications (1)
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CN201811006520.8A CN109162774B (en) | 2018-08-30 | 2018-08-30 | Internal insulation board for exhaust diffusion section of gas turbine |
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CN201811006520.8A CN109162774B (en) | 2018-08-30 | 2018-08-30 | Internal insulation board for exhaust diffusion section of gas turbine |
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CN109162774A CN109162774A (en) | 2019-01-08 |
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Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1541808A1 (en) * | 2003-12-11 | 2005-06-15 | Siemens Aktiengesellschaft | Turbine component with a heat- and erosion resistant coating |
EP1970461A1 (en) * | 2007-03-14 | 2008-09-17 | Siemens Aktiengesellschaft | Turbine part with heat insulation layer |
EP2679780A1 (en) * | 2012-06-28 | 2014-01-01 | Alstom Technology Ltd | Diffuser for the exhaust section of a gas turbine and gas turbine with such a diffuser |
CN106762071A (en) * | 2016-12-09 | 2017-05-31 | 江苏多为机械工业有限公司 | A kind of automobile engine to exhaust joint and its production technology |
CN107379672A (en) * | 2017-07-24 | 2017-11-24 | 苏州宏久航空防热材料科技有限公司 | A kind of resistant to elevated temperatures multi-layer ceramics cotton plate |
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Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1541808A1 (en) * | 2003-12-11 | 2005-06-15 | Siemens Aktiengesellschaft | Turbine component with a heat- and erosion resistant coating |
EP1970461A1 (en) * | 2007-03-14 | 2008-09-17 | Siemens Aktiengesellschaft | Turbine part with heat insulation layer |
EP2679780A1 (en) * | 2012-06-28 | 2014-01-01 | Alstom Technology Ltd | Diffuser for the exhaust section of a gas turbine and gas turbine with such a diffuser |
CN106762071A (en) * | 2016-12-09 | 2017-05-31 | 江苏多为机械工业有限公司 | A kind of automobile engine to exhaust joint and its production technology |
CN107379672A (en) * | 2017-07-24 | 2017-11-24 | 苏州宏久航空防热材料科技有限公司 | A kind of resistant to elevated temperatures multi-layer ceramics cotton plate |
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Inventor after: Ma Yong Inventor after: Leng Pan Inventor after: Ding Yi Inventor after: Zhao Junjie Inventor after: Han Xin Inventor before: Leng Pan Inventor before: Ding Yi Inventor before: Zhao Junjie Inventor before: Han Xin |