Supercritical gas turbine turbine stator blade holder and digital casting process

Abstract

The application discloses a supercritical gas turbine turbine vane holding ring and a digital casting process, which comprises a first metal ring, a second metal ring detachably arranged on the inner surface of the first metal ring, a plurality of spring grooves arranged on the inner surface of the first metal ring, a spring positioning rod integrally arranged on the outer surface of the second metal ring in alignment with each spring groove, a positioning spring sleeved on each spring positioning rod, and each spring positioning rod and the inner end of the positioning spring inserted into the aligned spring groove; a plurality of first through holes are axially arranged on the first metal ring, a second through hole is arranged on the second metal ring in alignment with each first through hole, a fixing bolt is arranged in each first through hole and the aligned second through hole, and the first metal ring and the second metal ring are connected and fixed through the fixing bolt. The technical scheme has the advantages of reasonable structure design, difficulty in deformation, convenience in disassembly and assembly, safety and reliability, and good practicability.

Description

Technical Field

[0001] This invention relates to the field of gas turbine technology, specifically to a supercritical gas turbine turbine turbine turbine blade holding ring and its digital casting process. Background Technology

[0002] In the current operation of gas turbines, the stator ring is a crucial component. Its high-temperature and highly corrosive working environment necessitates stringent requirements for its inherent properties. However, with current technology, after prolonged use, the stator ring exhibits varying degrees of damage and missing material, particularly at the inner pressure plate bolt area, where cracks, pitting, and missing material are observed. Furthermore, the entire stator ring displays characteristics of high-temperature oxidation, with signs of loosening at the connections and internal corrosion of the bolts by the gas.

[0003] In addition, the stationary blade ring exhibits obvious elliptical deformation, which causes the heat shield ring that fixes the turbine stationary blade and the turbine cylinder slot to frequently jam and become difficult to disassemble and assemble smoothly, affecting the overall structure and even potentially leading to production safety accidents. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the present invention aims to provide a supercritical gas turbine turbine turbine blade holding ring with a reasonable structural design, resistance to deformation, convenient assembly and disassembly, safety and reliability, and good practicality, as well as a digital casting process.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a turbine blade holding ring for a supercritical gas turbine, comprising a first metal ring, a second metal ring detachably disposed on the inner surface of the first metal ring, a plurality of spring grooves disposed on the inner surface of the first metal ring, and a spring positioning rod integrally disposed on the outer surface of the second metal ring aligned with each spring groove, a positioning spring sleeved on each spring positioning rod, and the inner ends of each spring positioning rod and the positioning spring being inserted into the aligned spring groove;

[0006] The first metal ring has a plurality of first through holes axially arranged on it, and the second metal ring has a second through hole aligned with each of the first through holes. A fixing bolt is inserted into each first through hole and the aligned second through hole, and the first metal ring and the second metal ring are connected and fixed by the fixing bolt.

[0007] Preferably, the positioning spring is a stainless steel spring; the fixing bolt is a stainless steel bolt.

[0008] Preferably, the casting process for both the first metal ring and the second metal ring includes the following steps:

[0009] (1) Place the dried sand core through the casting mold, close the box, complete the casting model, place the furnace charge in the medium frequency furnace for smelting to form molten steel, the smelting temperature is 1500~1650℃, then add deoxidizer for final deoxidation and transfer the molten steel into the ladle.

[0010] (2) After the molten steel is transferred into the ladle, the molten steel is refined by argon blowing in the ladle for 3-5 minutes, and then poured into the casting mold to form the shape.

[0011] (3) After the cast steel parts are formed, they are cooled naturally to remove the casting sand from the outside of the cast steel parts;

[0012] (4) After the sand removal is completed, the semi-finished product is put into a shot blasting machine to remove surface impurities;

[0013] (5) Cast steel parts are manually polished after being treated by shot blasting machine;

[0014] (6) After grinding, the first metal ring is inspected and put into storage.

[0015] As a preferred embodiment, the casting process of both the first metal ring and the second metal ring is monitored by a digital monitoring system for casting process: real-time reception of casting equipment production process parameters, production product information, and mold information; on-site operators or technicians adjust the production process parameters of the on-site casting equipment based on quality inspection results such as X-ray inspection, appearance inspection, or machine adjustment inspection.

[0016] When the digital monitoring system for casting processes detects a change in the production process parameters on the casting equipment, the system will begin to track and record this process change.

[0017] If there are no further changes to the process parameters one hour after the last adjustment, the system will summarize and record the process parameter adjustment history, forming a complete process parameter adjustment result in the system. Subsequently, relevant management personnel can select or input the reason for the process change in the system based on the full record of the process adjustment result in the system, and write the corresponding reason analysis to form a casting equipment process change adjustment data.

[0018] Preferably, the digital monitoring system for the casting process includes an information acquisition module, a data processing module, and a data analysis module.

[0019] Information acquisition module: Used to collect real-time information from casting equipment and quality inspection equipment, to know the current production status of casting products, mold model, process parameter information, to monitor products with abnormal quality inspection results and to monitor casting process changes in real time, and to connect with the intelligent casting machine adjustment system and mold management system to retrieve relevant process parameters;

[0020] Data processing module: Records every change in the casting process, and summarizes and aggregates key information such as the results of each casting process adjustment, process parameters, and cause analysis based on the on-site handling situation;

[0021] Data analysis module: Used to record every change and adjustment of process parameters, and to accumulate process parameter adjustment process, cause analysis and machine adjustment experience to form a knowledge base.

[0022] As a preferred embodiment, the chemical composition of the molten steel is C 0.16%, Mn 1.04%, P 0.015%, S 0.004%, Si 0.183%, Nb 0.005%, Mo 0.001%, V 0.0006%, Ti 0.004%, B 0.0003%, with the remainder being Fe.

[0023] By adopting the above technical solution, the beneficial effects of the present invention are as follows:

[0024] Compared with the prior art, the present invention has a reasonable structural design. The first metal ring and the second metal ring are locked together by bolts, which ensures a reliable connection and easy assembly and disassembly. Furthermore, a spring positioning rod is integrally provided on the outer surface of the second metal ring, aligned with each spring groove of the first metal ring. A positioning spring is fitted on each spring positioning rod, and the inner ends of each spring positioning rod and positioning spring are inserted into the aligned spring grooves. The positioning springs play a good role in preventing loosening, making the overall structure less prone to loosening and deformation, easy to assemble and disassemble, safe and reliable, and practical.

[0025] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention;

[0027] Figure 2 This is a cross-sectional schematic diagram of the first metal ring according to an embodiment of the present invention;

[0028] Figure 3 This is a cross-sectional schematic diagram of the second metal ring according to an embodiment of the present invention;

[0029] Figure 4 This is a schematic diagram of the digital monitoring system for casting process according to an embodiment of the present invention. Detailed Implementation

[0030] In the description of this embodiment, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0031] See Figures 1 to 4 The present invention discloses a turbine blade holding ring for a supercritical gas turbine, comprising a first metal ring 1, a second metal ring 2 detachably disposed on the inner surface of the first metal ring 1, a plurality of spring grooves 11 disposed on the inner surface of the first metal ring 1, and a spring positioning rod 21 integrally disposed on the outer surface of the second metal ring 2 aligned with each spring groove, and a positioning spring 3 sleeved on each spring positioning rod 21, with the inner ends of each spring positioning rod 21 and the positioning spring 3 inserted into the aligned spring groove 11;

[0032] The first metal ring 1 has a plurality of first through holes 12 axially arranged on it. The second metal ring 2 has a second through hole 13 aligned with each of the first through holes. A fixing bolt 4 passes through each first through hole 12 and the aligned second through hole 13. The first metal ring 1 and the second metal ring 2 are connected and fixed by the fixing bolt 4.

[0033] Preferably, the positioning spring 3 is a stainless steel spring; the fixing bolt 4 is a stainless steel bolt. The number of positioning springs 3, fixing bolts 4, spring grooves 11, first through holes 12, and second through holes 13 are all provided in the range of 3-6. The number of spring positioning rods 21 is also provided in the range of 3-6, and the number of spring positioning rods 21 is the same as the number of spring grooves 11.

[0034] This invention also provides a digital casting process for turbine blade holding rings of supercritical gas turbines, wherein the casting processes for both the first metal ring and the second metal ring include the following steps:

[0035] (1) Place the dried sand core through the casting mold, close the box, complete the casting model, place the furnace charge in the medium frequency furnace for smelting to form molten steel, the smelting temperature is 1500~1650℃, then add deoxidizer for final deoxidation and transfer the molten steel into the ladle.

[0036] (2) After the molten steel is transferred into the ladle, the molten steel is refined by argon blowing in the ladle for 3-5 minutes, and then poured into the casting mold to form the shape.

[0037] (3) After the cast steel parts are formed, they are cooled naturally to remove the casting sand from the outside of the cast steel parts;

[0038] (4) After the sand removal is completed, the semi-finished product is put into a shot blasting machine to remove surface impurities;

[0039] (5) Cast steel parts are manually polished after being treated by shot blasting machine;

[0040] (6) After grinding, the first metal ring is inspected and put into storage.

[0041] Preferably, both the first metal ring and the second metal ring are monitored by a digital monitoring system for casting process: real-time reception of casting equipment production process parameters, production product information, and mold information; on-site operators or technicians adjust the production process parameters of the on-site casting equipment based on quality inspection results such as X-ray inspection, appearance inspection, or machine adjustment inspection.

[0042] When the digital monitoring system for casting processes detects a change in the production process parameters on the casting equipment, the system will begin tracking and recording this process change. If there are no further changes to the process parameters one hour after the last adjustment, the system will summarize and record the process parameter adjustment history, forming a complete process parameter adjustment result in the system. Subsequently, relevant management personnel can select or input the reason for the process change in the system based on the full record of this process adjustment result, and write the corresponding reason analysis to form a casting equipment process change adjustment data.

[0043] Preferably, the digital monitoring system for the casting process includes an information acquisition module, a data processing module, and a data analysis module.

[0044] Information acquisition module: Used to collect real-time information from casting equipment and quality inspection equipment, to know the current production status of casting products, mold model, process parameter information, to monitor products with abnormal quality inspection results and to monitor casting process changes in real time, and to connect with the intelligent casting machine adjustment system and mold management system to retrieve relevant process parameters;

[0045] Data processing module: Records every change in the casting process, and summarizes and aggregates key information such as the results of each casting process adjustment, process parameters, and cause analysis based on the on-site handling situation;

[0046] Data analysis module: Used to record every change and adjustment of process parameters, and to accumulate process parameter adjustment process, cause analysis and machine adjustment experience to form a knowledge base.

[0047] Preferably, the chemical composition of the molten steel is C 0.16%, Mn 1.04%, P 0.015%, S 0.004%, Si 0.183%, Nb 0.005%, Mo 0.001%, V 0.0006%, Ti 0.004%, B 0.0003%, with the remainder being Fe.

[0048] In practical applications, the present invention has a reasonable structural design. The first metal ring and the second metal ring are locked together by bolts, ensuring a reliable connection and easy assembly and disassembly. Furthermore, a spring positioning rod is integrally provided on the outer surface of the second metal ring, aligned with each spring groove of the first metal ring. A positioning spring is fitted on each spring positioning rod, and the inner ends of each spring positioning rod and positioning spring are inserted into the aligned spring grooves. The positioning springs provide a good anti-loosening effect, making the overall structure less prone to loosening and deformation, easy to assemble and disassemble, safe, reliable, and practical.

[0049] The digital monitoring system for casting processes can replace manual recording, inspection, and verification based on real-time data collected on the products, molds, and production processes of each casting machine. According to the pre-set inspection times in the system, it generates process inspection records for each casting machine in each shift, which not only saves a significant amount of manual time but also ensures the accuracy of the data.

[0050] The above embodiments, which describe the specific features of the present invention, are only used to further illustrate the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-essential improvements and adjustments made to the present invention by those skilled in the art based on the above description of the invention shall fall within the scope of protection of the present invention.

Claims

1. A digital casting process for a turbine blade holding ring of a supercritical gas turbine, the turbine blade holding ring comprising a first metal ring, a second metal ring detachably disposed on the inner surface of the first metal ring, a plurality of spring grooves disposed on the inner surface of the first metal ring, a spring positioning rod integrally disposed on the outer surface of the second metal ring corresponding to each spring groove, a positioning spring sleeved on each spring positioning rod, and the inner ends of each spring positioning rod and the positioning spring being inserted into the aligned spring grooves; a plurality of first through holes axially disposed on the first metal ring, a second through hole disposed on the second metal ring corresponding to each first through hole, a fixing bolt passing through each first through hole and the aligned second through hole, and the first metal ring and the second metal ring being connected and fixed by the fixing bolts; the positioning springs are stainless steel springs; the fixing bolts are stainless steel bolts; characterized in that: The casting processes for both the first and second metal rings include the following steps: (1) Place the dried sand core through the casting mold, close the box, complete the casting model, place the furnace charge in the medium frequency furnace for smelting to form molten steel, the smelting temperature is 1500~1650℃, then add deoxidizer for final deoxidation and transfer the molten steel into the ladle. (2) After the molten steel is transferred into the ladle, the molten steel is refined by blowing argon in the ladle for 3-5 minutes, and then poured into the casting mold to form the shape. (3) After the cast steel parts are formed, they are cooled naturally to remove the casting sand from the outside of the cast steel parts; (4) After the sand removal is completed, the semi-finished product is put into a shot blasting machine to remove surface impurities; (5) Cast steel parts are manually polished after being treated by shot blasting machine; (6) After grinding, the first metal ring undergoes quality inspection and is put into storage; The casting process of both the first and second metal rings is monitored by a digital monitoring system for casting process: real-time reception of casting equipment production process parameters, production product information, and mold information; on-site operators or technicians adjust the production process parameters of the on-site casting equipment based on the quality inspection results of X-ray inspection, appearance inspection, or machine adjustment inspection. When the digital monitoring system for casting processes detects a change in the production process parameters on the casting equipment, the system will begin to track and record this process change. If there are no further changes to the process parameters one hour after the last adjustment, the system will summarize and record the process parameter adjustment history, forming a complete process parameter adjustment result in the system. Subsequently, relevant management personnel can select or input the reason for the process change in the system based on the full record of the process adjustment result in the system, and write the corresponding reason analysis to form a casting equipment process change adjustment data.

2. The digital casting process for a supercritical gas turbine turbine turbine blade holding ring according to claim 1, characterized in that: The digital monitoring system for the casting process includes an information acquisition module, a data processing module, and a data analysis module. Information acquisition module: Used to collect real-time information from casting equipment and quality inspection equipment, to know the current production status of casting products, mold model, process parameter information, to monitor products with abnormal quality inspection results and to monitor casting process changes in real time, and to connect with the intelligent casting machine adjustment system and mold management system to retrieve relevant process parameters; Data processing module: Records every change in the casting process, and summarizes and aggregates the key information of each casting process adjustment result, process parameters, and cause analysis based on the on-site handling situation; Data analysis module: Used to record every change and adjustment of process parameters, and to accumulate process parameter adjustment process, cause analysis and machine adjustment experience to form a knowledge base.

3. The digital casting process for a supercritical gas turbine turbine turbine blade holding ring according to claim 2, characterized in that: The chemical composition of the molten steel is C 0.16%, Mn 1.04%, P 0.015%, S 0.004%, Si 0.183%, Nb 0.005%, Mo 0.001%, V 0.0006%, Ti 0.004%, B 0.0003%, with the remainder being Fe.

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