A hydrogen-cooled generator split-frame seal performance evaluation system and method
By constructing a sealing performance evaluation system for split-type hydrogen-cooled generators, the problem of product failure caused by unverified sealing structures in existing technologies has been solved. This system enables a comprehensive and systematic evaluation of the sealing performance of split-type hydrogen-cooled generators, improving the accuracy and reliability of the evaluation, reducing costs, and ensuring the safe and stable operation of the generator.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- DONGFANG ELECTRIC MACHINERY
- Filing Date
- 2026-04-02
- Publication Date
- 2026-06-05
AI Technical Summary
The lack of reliable methods in the current technology to verify the effectiveness of the new sealing structure for the split base of the hydrogen-cooled generator has led to the direct application of the sealing structure without verification, which may result in product failure and increase R&D costs and time.
A system for evaluating the sealing performance of a split-type base for hydrogen-cooled generators was constructed, including an airtightness testing device and a sealing effect evaluation program. Through simulation testing and quantitative analysis, the static sealing performance, dynamic changes, and error correction capabilities were evaluated. A helium leak detector was used to accurately locate the leak point, and clear leakage level classification standards were set.
It enables a comprehensive and systematic evaluation of the sealing performance of the split-type base of hydrogen-cooled generators, improves the relevance and accuracy of the test, reduces costs, ensures the reliability of the evaluation results and their closeness to engineering practice, supports rapid evaluation and error correction, and ensures the safe and stable operation of the generator.
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Figure CN122149764A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of steam turbine generator design technology, and in particular to a system and method for evaluating the sealing performance of a split-type base for a hydrogen-cooled generator. Background Technology
[0002] In the field of hydrogen-cooled generator sealing, there is a significant and urgent problem with existing technologies: the lack of a reliable method to verify the effectiveness of new sealing structures. In the past, when researchers designed a completely new sealing structure, they often applied it directly to products without sufficient verification.
[0003] This practice carries significant risks. Since the sealing structure is a critical component ensuring the normal operation of equipment, its effectiveness directly impacts product performance and lifespan. If a new sealing structure is used directly without proper verification, its poor sealing performance will directly lead to product failure, potentially causing substantial economic losses. Furthermore, product failure may trigger a series of subsequent problems, such as equipment downtime and increased maintenance costs.
[0004] More seriously, due to the lack of verification methods for existing technologies, problems with new sealing structures often go undetected and uncorrected in a timely manner. This leads researchers to blindly make improvements and optimizations without fully understanding the nature of the problem, further increasing research and development costs and time.
[0005] Therefore, in order to solve this problem, there is an urgent need for a new evaluation system and method to verify sealing performance, so as to accurately and reliably evaluate the new sealing structure during the product design stage, thereby ensuring its stability and reliability in practical applications.
[0006] Chinese patent application CN116008806A, published on April 25, 2023, discloses a split-type motor testing device, including a testing base with a testing platform for placing the sample to be tested, and a torque testing mechanism installed on the testing base; it also includes a high and low temperature testing mechanism, which comprises a split high and low temperature control mechanism and a testing chamber. The high and low temperature control mechanism is connected to the testing chamber through an air outlet pipe and an air return pipe. The testing chamber includes a detachably connected fixed box and a movable box. The fixed box is installed on the testing base and is fitted onto the testing platform. The high and low temperature control mechanism and the testing chamber cooperate to perform high and low temperature tests on the sample to be tested.
[0007] The split-type motor testing device disclosed in this patent application can comprehensively evaluate various motor performance aspects, effectively improving motor testing accuracy and ensuring motor quality. However, it is not suitable for evaluating the sealing performance of split-type bases for hydrogen-cooled generators, and cannot achieve a comprehensive and systematic evaluation of sealing performance. Summary of the Invention
[0008] To overcome the shortcomings of the prior art, this invention provides a system and method for evaluating the sealing performance of a split-type base for hydrogen-cooled generators. This invention constructs a complete sealing performance evaluation system that combines simulation testing with quantitative analysis. It can not only evaluate static sealing performance, but also monitor dynamic changes and the ability to correct errors after test failures, thus achieving a comprehensive and systematic evaluation of sealing performance.
[0009] This invention is achieved through the following technical solution: A system for evaluating the sealing performance of a split-type base for a hydrogen-cooled generator includes: An airtightness testing device is used to simulate the sealing structure and working pressure environment of a split-type base of a hydrogen-cooled generator to conduct airtightness tests. The sealing performance evaluation procedure is used to quantitatively evaluate the sealing performance based on the test data of the airtightness testing device. The evaluation content includes static sealing performance, dynamic changes, and the ability to correct and reprocess after sealing failure.
[0010] The airtightness testing device includes an upper cover plate, a side cover plate, a test frame, and locking bolts. The upper cover plate is fixedly connected to the side cover plate and the test frame respectively by locking bolts. The side cover plate is fixedly connected to the test frame by locking bolts. An air inlet flange is installed on the test frame, and an exhaust flange is installed on the upper cover plate. The upper cover plate is used to simulate the upper half of the split-type base of a hydrogen-cooled generator; The test frame is used to simulate the lower half of the split-type frame of a hydrogen-cooled generator; The side cover is used to simulate the end cover of the split-type base of a hydrogen-cooled generator; The contact surface between the upper cover plate and the test frame is used to simulate the sealing of the horizontal joint surfaces of the upper and lower halves of the split base of the hydrogen-cooled generator. The junction between the upper cover plate, the test frame, and the side cover plate is used to simulate the seal between the upper half of the split-type base of the hydrogen-cooled generator and the lower half of the base and the end cover.
[0011] The airtightness test device is a scaled-down model of the internal cavity volume of the split-type base of a hydrogen-cooled generator.
[0012] The test frame has a joint sealing groove with a joint sealing strip embedded in it. The side cover plate has a sealing groove with a sealing strip embedded in it. The top cover plate has a glue injection hole, a glue injection channel, and a square glue injection groove connected in sequence. The square glue injection groove has a first sealant outlet and a second sealant outlet. The first sealant outlet is connected to the sealing groove, and the second sealant outlet is connected to the joint sealing groove.
[0013] Furthermore, it also includes a helium leak detector, which is used to detect the concentration of helium in the environment and the helium concentration around the airtightness testing device.
[0014] The sealing effect evaluation program includes a data processing module, which is used to obtain the ambient helium concentration value C1 detected by the helium leak detector and the helium concentration value C2 around the airtightness test device, and calculate the concentration ratio K=C2 / C1.
[0015] The sealing effect evaluation program also includes an evaluation classification module, which is used to classify the degree of leakage according to the concentration ratio K. When K < 10, it is defined as a microleak, indicating a good sealing effect; When 10≤K<100, it is defined as a small leak, indicating that the sealing effect is average; When 100≤K<1000, it is defined as a significant leak point, indicating poor sealing performance; When K≥1000, it is defined as a major leak, indicating extremely poor sealing performance.
[0016] A method for evaluating the sealing performance of a split-type base of a hydrogen-cooled generator, characterized by comprising the following steps: S1. Assemble the airtightness test device, fasten the top cover plate, side cover plate and test frame with bolts, and install the air inlet flange and exhaust flange. S2. Inject helium gas at a preset pressure into the assembled airtightness test device through the air inlet flange; S3. Use a helium leak detector to detect the ambient helium concentration C1 and the helium concentration C2 around the airtightness test device. S4. Based on the test data, evaluate the sealing performance using the sealing effect evaluation procedure.
[0017] In step S4, the evaluation includes calculating the concentration ratio K = C2 / C1.
[0018] Step S4 also includes classifying the degree of leakage based on the concentration ratio K: If K < 10, it is judged as a minor leak, and the sealing effect is qualified; If 10≤K<100, it is considered a minor leak, and the sealing effect needs to be monitored. If 100≤K<1000, it is determined that there is a significant leak and the sealing effect is unqualified. If K ≥ 1000, it is judged as a major leak, and the sealing effect is extremely unqualified.
[0019] After step S4 assesses a sealing failure, a corrective reprocessing step is also included, in which operating conditions are simulated on the airtightness testing device to perform re-insertion or sealing tests until the sealing effect is restored.
[0020] The error correction and reprocessing steps include conducting operational tests under simulated conditions without shutting down the system.
[0021] The beneficial effects of this invention are mainly reflected in the following aspects: 1. Compared with the prior art, the present invention constructs a complete sealing performance evaluation system, which combines simulation testing with quantitative analysis. It can not only evaluate static sealing performance, but also monitor dynamic changes and error correction capabilities after test failure, thus realizing a comprehensive and systematic evaluation of sealing performance.
[0022] 2. This invention, through a modular component consisting of an upper cover plate, side cover plates, and a test frame, accurately simulates the key sealing interfaces of a split-type hydrogen-cooled generator frame. This allows the airtightness testing device to specifically reproduce and test complex sealing conditions in actual operation, improving the relevance and accuracy of the test. 3. This invention's airtightness testing device is a scaled-down model of the internal volume of a split-type hydrogen-cooled generator frame. By using a scaled-down internal model, while ensuring the physical mechanism of the test is similar to the real situation, it significantly reduces the manufacturing cost, space occupation, and gas consumption required for the airtightness testing device, making the test more economical and convenient. 4. In this invention, the test frame has a joint sealing groove with a joint sealing strip embedded in it. The side cover plate has a sealing groove with a sealing strip embedded in it. The top cover plate has sequentially connected injection holes, injection channels, and a square injection groove. The square injection groove has a first sealant outlet and a second sealant outlet. The first sealant outlet is connected to the sealing groove, and the second sealant outlet is connected to the joint sealing groove. This highly replicates the actual sealing process of the split-type base of a hydrogen-cooled generator, allowing the test to more realistically reflect the filling and molding effect of the sealing material and potential leakage paths, resulting in evaluation results that are closer to engineering practice. 5. This invention introduces a helium leak detector for detection. Utilizing the high sensitivity of helium gas spectrometry leak detection, it can accurately locate and quantify minute leaks, greatly improving the entire evaluation system's ability to detect early, minute leaks.
[0023] 6. This invention calculates the helium concentration ratio K between the environment and the vicinity of the airtightness testing device through a data processing module, transforming the detection signal into a standardized quantitative indicator. This provides direct numerical evidence for objectively and quantitatively comparing sealing performance under different conditions. 7. This invention's evaluation and classification module sets clear leakage level classification standards based on the concentration ratio K, transforming quantitative data into intuitive qualitative evaluations. This makes the evaluation conclusions clear and easy to understand, facilitating engineers to quickly determine the sealing status and formulate corresponding measures.
[0024] 8. Compared with existing technologies, the evaluation method of this invention ensures the consistency and repeatability of the testing process, enabling the evaluation of sealing performance to be carried out in a standardized and efficient manner. 9. This invention can accurately simulate the actual working environment of a split-type hydrogen-cooled generator base, providing a comprehensive and accurate evaluation of sealing performance and ensuring the reliability of the evaluation results.
[0025] 10. This invention can quickly complete the evaluation of sealing performance, improve evaluation efficiency, reduce manual intervention and time costs, and is highly efficient and convenient.
[0026] 11. This invention is applicable to split-type bases of hydrogen-cooled generators of different models and specifications, and has strong flexibility and versatility, which can meet diverse evaluation needs.
[0027] 12. The evaluation results of this invention can provide strong guidance for the operation and maintenance of generators, help engineers to discover and solve sealing problems in a timely manner, and ensure the safe and stable operation of generators. Attached Figure Description
[0028] The present invention will now be further described in detail with reference to the accompanying drawings and specific embodiments: Figure 1 This is a schematic diagram of the airtightness testing device of the present invention; Figure 2 This is a partial cross-sectional view of the airtightness testing device of the present invention; Figure 3 for Figure 2 Enlarged view of point A in the middle; The markings in the diagram are: 1. Top cover plate, 2. Side cover plate, 3. Test frame, 4. Handling bolt, 5. Inlet flange, 6. Exhaust flange, 7. Joint sealing groove, 8. Joint sealing strip, 9. Sealing groove, 10. Sealing strip, 11. Injection hole, 12. Injection channel, 13. Square injection groove, 14. First sealant outlet, 15. Second sealant outlet. Detailed Implementation
[0029] Example 1 A system for evaluating the sealing performance of a split-type base for a hydrogen-cooled generator includes: An airtightness testing device is used to simulate the sealing structure and working pressure environment of a split-type base of a hydrogen-cooled generator to conduct airtightness tests. The sealing performance evaluation procedure is used to quantitatively evaluate the sealing performance based on the test data of the airtightness testing device. The evaluation content includes static sealing performance, dynamic changes, and the ability to correct and reprocess after sealing failure.
[0030] This embodiment is the most basic implementation method. Compared with the prior art, it constructs a complete sealing performance evaluation system, which combines simulation testing with quantitative analysis. It can not only evaluate static sealing performance, but also monitor dynamic changes and error correction capabilities after test failure, thus realizing a comprehensive and systematic evaluation of sealing performance.
[0031] Example 2 See Figure 1 A system for evaluating the sealing performance of a split-type base for a hydrogen-cooled generator, comprising: An airtightness testing device is used to simulate the sealing structure and working pressure environment of a split-type base of a hydrogen-cooled generator to conduct airtightness tests. The sealing performance evaluation procedure is used to quantitatively evaluate the sealing performance based on the test data of the airtightness testing device. The evaluation content includes static sealing performance, dynamic changes, and the ability to correct and reprocess after sealing failure.
[0032] The airtightness testing device includes an upper cover plate 1, a side cover plate 2, a test frame 3, and a clamping bolt 4. The upper cover plate 1 is fixedly connected to the side cover plate 2 and the test frame 3 respectively by the clamping bolt 4. The side cover plate 2 is fixedly connected to the test frame 3 by the clamping bolt 4. An air inlet flange 5 is installed on the test frame 3, and an exhaust flange 6 is installed on the upper cover plate 1. The upper cover plate 1 is used to simulate the upper half of the split-type base of a hydrogen-cooled generator; The test frame 3 is used to simulate the lower half of the split-type frame of a hydrogen-cooled generator; The side cover plate 2 is used to simulate the end cover of the split-type base of the hydrogen-cooled generator; The contact surface between the upper cover plate 1 and the test frame 3 is used to simulate the sealing of the horizontal joint surfaces of the upper and lower halves of the split base of the hydrogen-cooled generator. The junction between the upper cover plate 1, the test frame 3, and the side cover plate 2 is used to simulate the seal between the upper half of the split-type base of the hydrogen-cooled generator and the lower half of the base and the end cover.
[0033] This embodiment is a preferred implementation. The airtightness test device, formed by modular components such as the top cover plate, side cover plate, and test frame, accurately simulates the key sealing interface of the split frame of the hydrogen-cooled generator. This allows the airtightness test device to specifically reproduce and test the complex sealing conditions in actual operation, thereby improving the relevance and accuracy of the test.
[0034] Example 3 See Figures 1-3 A system for evaluating the sealing performance of a split-type base for a hydrogen-cooled generator, comprising: An airtightness testing device is used to simulate the sealing structure and working pressure environment of a split-type base of a hydrogen-cooled generator to conduct airtightness tests. The sealing performance evaluation procedure is used to quantitatively evaluate the sealing performance based on the test data of the airtightness testing device. The evaluation content includes static sealing performance, dynamic changes, and the ability to correct and reprocess after sealing failure.
[0035] The airtightness testing device includes an upper cover plate 1, a side cover plate 2, a test frame 3, and a clamping bolt 4. The upper cover plate 1 is fixedly connected to the side cover plate 2 and the test frame 3 respectively by the clamping bolt 4. The side cover plate 2 is fixedly connected to the test frame 3 by the clamping bolt 4. An air inlet flange 5 is installed on the test frame 3, and an exhaust flange 6 is installed on the upper cover plate 1. The upper cover plate 1 is used to simulate the upper half of the split-type base of a hydrogen-cooled generator; The test frame 3 is used to simulate the lower half of the split-type frame of a hydrogen-cooled generator; The side cover plate 2 is used to simulate the end cover of the split-type base of the hydrogen-cooled generator; The contact surface between the upper cover plate 1 and the test frame 3 is used to simulate the sealing of the horizontal joint surfaces of the upper and lower halves of the split base of the hydrogen-cooled generator. The junction between the upper cover plate 1, the test frame 3, and the side cover plate 2 is used to simulate the seal between the upper half of the split-type base of the hydrogen-cooled generator and the lower half of the base and the end cover.
[0036] The airtightness test device is a scaled-down model of the internal cavity volume of the split-type base of a hydrogen-cooled generator.
[0037] The test frame 3 has a joint sealing groove 7, and a joint sealing strip 8 is embedded in the joint sealing groove 7. The side cover plate 2 has a sealing groove 9, and a sealing strip 10 is embedded in the sealing groove 9. The upper cover plate 1 has an injection hole 11, an injection channel 12 and a square injection groove 13 connected in sequence. The square injection groove 13 has a first sealant outlet 14 and a second sealant outlet 15. The first sealant outlet 14 is connected to the sealing groove 9, and the second sealant outlet 15 is connected to the joint sealing groove 7.
[0038] This embodiment is another preferred implementation. The airtightness testing device is a scaled-down model of the internal cavity volume of the split-type frame of the hydrogen-cooled generator. By using a scaled-down internal cavity model, while ensuring that the physical mechanism of the test is similar to the real situation, the manufacturing cost, space occupation, and gas consumption required for the airtightness testing device are significantly reduced, making the test more economical and convenient. The test frame has a joint sealing groove with a joint sealing strip embedded in it. The side cover plate has a sealing groove with a sealing strip embedded in it. The top cover plate has sequentially connected injection holes, injection channels, and a square injection groove. The square injection groove has a first sealant outlet and a second sealant outlet. The first sealant outlet is connected to the sealing groove, and the second sealant outlet is connected to the joint sealing groove. This highly replicates the actual sealing process of the split-type frame of the hydrogen-cooled generator, allowing the test to more realistically reflect the filling and molding effect of the sealing material and potential leakage paths, and the evaluation results are closer to engineering practice.
[0039] Example 4 See Figures 1-3 A system for evaluating the sealing performance of a split-type base for a hydrogen-cooled generator, comprising: An airtightness testing device is used to simulate the sealing structure and working pressure environment of a split-type base of a hydrogen-cooled generator to conduct airtightness tests. The sealing performance evaluation procedure is used to quantitatively evaluate the sealing performance based on the test data of the airtightness testing device. The evaluation content includes static sealing performance, dynamic changes, and the ability to correct and reprocess after sealing failure.
[0040] The airtightness testing device includes an upper cover plate 1, a side cover plate 2, a test frame 3, and a clamping bolt 4. The upper cover plate 1 is fixedly connected to the side cover plate 2 and the test frame 3 respectively by the clamping bolt 4. The side cover plate 2 is fixedly connected to the test frame 3 by the clamping bolt 4. An air inlet flange 5 is installed on the test frame 3, and an exhaust flange 6 is installed on the upper cover plate 1. The upper cover plate 1 is used to simulate the upper half of the split-type base of a hydrogen-cooled generator; The test frame 3 is used to simulate the lower half of the split-type frame of a hydrogen-cooled generator; The side cover plate 2 is used to simulate the end cover of the split-type base of the hydrogen-cooled generator; The contact surface between the upper cover plate 1 and the test frame 3 is used to simulate the sealing of the horizontal joint surfaces of the upper and lower halves of the split base of the hydrogen-cooled generator. The junction between the upper cover plate 1, the test frame 3, and the side cover plate 2 is used to simulate the seal between the upper half of the split-type base of the hydrogen-cooled generator and the lower half of the base and the end cover.
[0041] The airtightness test device is a scaled-down model of the internal cavity volume of the split-type base of a hydrogen-cooled generator.
[0042] The test frame 3 has a joint sealing groove 7, and a joint sealing strip 8 is embedded in the joint sealing groove 7. The side cover plate 2 has a sealing groove 9, and a sealing strip 10 is embedded in the sealing groove 9. The upper cover plate 1 has an injection hole 11, an injection channel 12 and a square injection groove 13 connected in sequence. The square injection groove 13 has a first sealant outlet 14 and a second sealant outlet 15. The first sealant outlet 14 is connected to the sealing groove 9, and the second sealant outlet 15 is connected to the joint sealing groove 7.
[0043] Furthermore, it also includes a helium leak detector, which is used to detect the concentration of helium in the environment and the helium concentration around the airtightness testing device.
[0044] The sealing effect evaluation program includes a data processing module, which is used to obtain the ambient helium concentration value C1 detected by the helium leak detector and the helium concentration value C2 around the airtightness test device, and calculate the concentration ratio K=C2 / C1.
[0045] This embodiment is another preferred implementation method, which introduces a helium leak detector for detection. It utilizes the high sensitivity of helium gas spectrometry leak detection method to accurately locate and quantify minute leaks, greatly improving the ability of the entire evaluation system to detect early and minute leak defects.
[0046] The data processing module calculates the ratio K of the helium concentration between the environment and the vicinity of the airtightness test device, transforming the detection signal into a standardized quantitative indicator. This provides direct numerical evidence for objectively and quantitatively comparing the sealing performance under different conditions.
[0047] Example 5 See Figures 1-3 A system for evaluating the sealing performance of a split-type base for a hydrogen-cooled generator, comprising: An airtightness testing device is used to simulate the sealing structure and working pressure environment of a split-type base of a hydrogen-cooled generator to conduct airtightness tests. The sealing performance evaluation procedure is used to quantitatively evaluate the sealing performance based on the test data of the airtightness testing device. The evaluation content includes static sealing performance, dynamic changes, and the ability to correct and reprocess after sealing failure.
[0048] The airtightness testing device includes an upper cover plate 1, a side cover plate 2, a test frame 3, and a clamping bolt 4. The upper cover plate 1 is fixedly connected to the side cover plate 2 and the test frame 3 respectively by the clamping bolt 4. The side cover plate 2 is fixedly connected to the test frame 3 by the clamping bolt 4. An air inlet flange 5 is installed on the test frame 3, and an exhaust flange 6 is installed on the upper cover plate 1. The upper cover plate 1 is used to simulate the upper half of the split-type base of a hydrogen-cooled generator; The test frame 3 is used to simulate the lower half of the split-type frame of a hydrogen-cooled generator; The side cover plate 2 is used to simulate the end cover of the split-type base of the hydrogen-cooled generator; The contact surface between the upper cover plate 1 and the test frame 3 is used to simulate the sealing of the horizontal joint surfaces of the upper and lower halves of the split base of the hydrogen-cooled generator. The junction between the upper cover plate 1, the test frame 3, and the side cover plate 2 is used to simulate the seal between the upper half of the split-type base of the hydrogen-cooled generator and the lower half of the base and the end cover.
[0049] The airtightness test device is a scaled-down model of the internal cavity volume of the split-type base of a hydrogen-cooled generator.
[0050] The test frame 3 has a joint sealing groove 7, and a joint sealing strip 8 is embedded in the joint sealing groove 7. The side cover plate 2 has a sealing groove 9, and a sealing strip 10 is embedded in the sealing groove 9. The upper cover plate 1 has an injection hole 11, an injection channel 12 and a square injection groove 13 connected in sequence. The square injection groove 13 has a first sealant outlet 14 and a second sealant outlet 15. The first sealant outlet 14 is connected to the sealing groove 9, and the second sealant outlet 15 is connected to the joint sealing groove 7.
[0051] Furthermore, it also includes a helium leak detector, which is used to detect the concentration of helium in the environment and the helium concentration around the airtightness testing device.
[0052] The sealing effect evaluation program includes a data processing module, which is used to obtain the ambient helium concentration value C1 detected by the helium leak detector and the helium concentration value C2 around the airtightness test device, and calculate the concentration ratio K=C2 / C1.
[0053] The sealing effect evaluation program also includes an evaluation classification module, which is used to classify the degree of leakage according to the concentration ratio K. When K < 10, it is defined as a microleak, indicating a good sealing effect; When 10≤K<100, it is defined as a small leak, indicating that the sealing effect is average; When 100≤K<1000, it is defined as a significant leak point, indicating poor sealing performance; When K≥1000, it is defined as a major leak, indicating extremely poor sealing performance.
[0054] This embodiment is another preferred implementation. The assessment and classification module sets a clear classification standard for leakage level based on the concentration ratio K, transforming quantitative data into intuitive qualitative evaluation, making the assessment conclusions clear and easy to understand, and facilitating engineers to quickly judge the sealing status and formulate corresponding measures.
[0055] Example 6 See Figures 1-3A method for evaluating the sealing performance of a split-type base of a hydrogen-cooled generator includes the following steps: S1. Assemble the airtightness test device, fasten the upper cover plate 1, side cover plate 2 and test frame 3 with bolts 4, and install the air inlet flange 5 and exhaust flange 6. S2. Inject helium gas at a preset pressure into the assembled airtightness test device through the air inlet flange 5; S3. Use a helium leak detector to detect the ambient helium concentration C1 and the helium concentration C2 around the airtightness test device. S4. Based on the test data, evaluate the sealing performance using the sealing effect evaluation procedure.
[0056] This embodiment is another preferred implementation method. Compared with the prior art, the evaluation method ensures the consistency and repeatability of the testing process, so that the evaluation of sealing performance can be carried out in a standardized and efficient manner.
[0057] Example 7 See Figures 1-3 A method for evaluating the sealing performance of a split-type base of a hydrogen-cooled generator includes the following steps: S1. Assemble the airtightness test device, fasten the upper cover plate 1, side cover plate 2 and test frame 3 with bolts 4, and install the air inlet flange 5 and exhaust flange 6. S2. Inject helium gas at a preset pressure into the assembled airtightness test device through the air inlet flange 5; S3. Use a helium leak detector to detect the ambient helium concentration C1 and the helium concentration C2 around the airtightness test device. S4. Based on the test data, evaluate the sealing performance using the sealing effect evaluation procedure.
[0058] In step S4, the evaluation includes calculating the concentration ratio K = C2 / C1.
[0059] Step S4 also includes classifying the degree of leakage based on the concentration ratio K: If K < 10, it is judged as a minor leak, and the sealing effect is qualified; If 10≤K<100, it is considered a minor leak, and the sealing effect needs to be monitored. If 100≤K<1000, it is determined that there is a significant leak and the sealing effect is unqualified. If K ≥ 1000, it is judged as a major leak, and the sealing effect is extremely unqualified.
[0060] After step S4 assesses a sealing failure, a corrective reprocessing step is also included, in which operating conditions are simulated on the airtightness testing device to perform re-insertion or sealing tests until the sealing effect is restored.
[0061] The error correction and reprocessing steps include conducting operational tests under simulated conditions without shutting down the system.
[0062] This embodiment is another preferred implementation method, which can accurately simulate the actual working environment of the split-type base of the hydrogen-cooled generator, conduct a comprehensive and accurate evaluation of the sealing performance, and ensure the reliability of the evaluation results.
[0063] It can quickly complete the assessment of sealing performance, improve assessment efficiency, reduce manual intervention and time costs, and is highly efficient and convenient.
[0064] It is suitable for split-type bases of hydrogen-cooled generators of different models and specifications, and has strong flexibility and versatility, which can meet diverse evaluation needs.
[0065] The assessment results can provide strong guidance for the operation and maintenance of the generator, helping engineers to identify and resolve sealing problems in a timely manner, and ensuring the safe and stable operation of the generator. The basic principle of this invention is as follows: First, based on a scaled-down physical simulation airtightness testing device, the device accurately replicates key sealing structures such as the horizontal joint surface and end cover junction of the split-type frame of the hydrogen-cooled generator through the combination of core components including the upper cover plate 1, side cover plate 2, and test frame 3. During testing, helium gas at a preset pressure is injected into the sealed cavity through the inlet flange 5 as a tracer gas to simulate the hydrogen working environment inside the generator. Subsequently, a highly sensitive helium leak detector is used to scan and detect the key sealing surfaces around the airtightness testing device, detecting the concentration of helium gas leaking into the external environment due to poor sealing, thereby physically reproducing and locating potential leak points.
[0066] Secondly, the sealing performance evaluation program intelligently processes and quantitatively analyzes the detection data. This program obtains the background helium concentration value measured by the helium leak detector and the concentration value at the leak point, and calculates the ratio. This ratio, as a core quantitative indicator, is input into the evaluation classification module, automatically classifying the leakage degree into different levels, from "micro-leak" to "major leak," thereby providing an objective evaluation of the static sealing performance.
[0067] Furthermore, by repeatedly testing and comparing data at different time points or under different pressure conditions, the sealing performance evaluation procedure can also assess the dynamic trend of sealing performance changes, as well as the recovery of sealing performance after corrective measures are taken, such as re-insertion and tightening, ultimately achieving a comprehensive and dynamic evaluation of the sealing structure performance.
Claims
1. A system for evaluating the sealing performance of a split-type base for a hydrogen-cooled generator, characterized in that, include: An airtightness testing device is used to simulate the sealing structure and working pressure environment of a split-type base of a hydrogen-cooled generator to conduct airtightness tests. The sealing performance evaluation procedure is used to quantitatively evaluate the sealing performance based on the test data of the airtightness testing device. The evaluation content includes static sealing performance, dynamic changes, and the ability to correct and reprocess after sealing failure.
2. The hydrogen-cooled generator split-type base sealing performance evaluation system according to claim 1, characterized in that: The airtightness test device includes an upper cover plate (1), a side cover plate (2), a test frame (3), and a clamping bolt (4). The upper cover plate (1) is fixedly connected to the side cover plate (2) and the test frame (3) respectively by the clamping bolt (4). The side cover plate (2) is fixedly connected to the test frame (3) by the clamping bolt (4). An air inlet flange (5) is installed on the test frame (3), and an exhaust flange (6) is installed on the upper cover plate (1). The upper cover plate (1) is used to simulate the upper half of the split-type base of a hydrogen-cooled generator; The test frame (3) is used to simulate the lower half of the split-type frame of a hydrogen-cooled generator; The side cover (2) is used to simulate the end cover of the split-type base of the hydrogen-cooled generator; The contact surface between the upper cover plate (1) and the test frame (3) is used to simulate the sealing of the horizontal joint surface of the upper and lower halves of the split base of the hydrogen-cooled generator; The junction between the upper cover plate (1), the test frame (3), and the side cover plate (2) is used to simulate the seal between the upper half of the split-type base of the hydrogen-cooled generator, the lower half of the base, and the end cover.
3. The hydrogen-cooled generator split-type base sealing performance evaluation system according to claim 2, characterized in that: The airtightness test device is a scaled-down model of the internal cavity volume of the split-type base of a hydrogen-cooled generator.
4. The hydrogen-cooled generator split-type base sealing performance evaluation system according to claim 2, characterized in that: The test frame (3) has a joint sealing groove (7) and a joint sealing strip (8) embedded in the joint sealing groove (7). The side cover plate (2) has a sealing groove (9) and a sealing strip (10) embedded in the sealing groove (9). The top cover plate (1) has a glue injection hole (11), a glue injection channel (12) and a square glue injection groove (13) connected in sequence. The square glue injection groove (13) has a first sealant outlet (14) and a second sealant outlet (15). The first sealant outlet (14) is connected to the sealing groove (9) and the second sealant outlet (15) is connected to the joint sealing groove (7).
5. The hydrogen-cooled generator split-type base sealing performance evaluation system according to claim 2, characterized in that: It also includes a helium leak detector, which is used to detect the concentration of helium in the environment and the helium concentration around the airtightness test device.
6. The hydrogen-cooled generator split-type base sealing performance evaluation system according to claim 5, characterized in that: The sealing effect evaluation program includes a data processing module, which is used to obtain the ambient helium concentration value C1 detected by the helium leak detector and the helium concentration value C2 around the airtightness test device, and calculate the concentration ratio K=C2 / C1.
7. The hydrogen-cooled generator split-type base sealing performance evaluation system according to claim 6, characterized in that: The sealing effect evaluation program also includes an evaluation classification module, which is used to classify the degree of leakage according to the concentration ratio K. When K < 10, it is defined as a microleak, indicating a good sealing effect; When 10≤K<100, it is defined as a small leak, indicating that the sealing effect is average; When 100≤K<1000, it is defined as a significant leak point, indicating poor sealing performance; When K≥1000, it is defined as a major leak, indicating extremely poor sealing performance.
8. A method for evaluating the sealing performance of a split-type base of a hydrogen-cooled generator, employing the sealing performance evaluation system for a split-type base of a hydrogen-cooled generator as described in any one of claims 1-7, characterized in that... Includes the following steps: S1. Assemble the airtightness test device, fasten the upper cover plate (1), side cover plate (2) and test frame (3) with bolts (4), and install the air inlet flange (5) and exhaust flange (6). S2. Inject helium gas at a preset pressure into the assembled airtightness test device through the air inlet flange (5); S3. Use a helium leak detector to detect the ambient helium concentration C1 and the helium concentration C2 around the airtightness test device. S4. Based on the test data, evaluate the sealing performance using the sealing effect evaluation procedure.
9. The method for evaluating the sealing performance of a split-type base for a hydrogen-cooled generator according to claim 8, characterized in that: In step S4, the evaluation includes calculating the concentration ratio K = C2 / C1.
10. The method for evaluating the sealing performance of a split-type base for a hydrogen-cooled generator according to claim 9, characterized in that: Step S4 also includes classifying the degree of leakage based on the concentration ratio K: If K < 10, it is judged as a minor leak, and the sealing effect is qualified; If 10≤K<100, it is considered a minor leak, and the sealing effect needs to be monitored. If 100≤K<1000, it is determined that there is a significant leak and the sealing effect is unqualified. If K ≥ 1000, it is judged as a major leak, and the sealing effect is extremely unqualified.
11. The method for evaluating the sealing performance of a split-type base of a hydrogen-cooled generator according to claim 8, characterized in that: After step S4 assesses a sealing failure, a corrective reprocessing step is also included, in which operating conditions are simulated on the airtightness testing device to perform re-insertion or sealing tests until the sealing effect is restored.
12. The method for evaluating the sealing performance of a split-type base for a hydrogen-cooled generator according to claim 11, characterized in that: The error correction and reprocessing steps include conducting operational tests under simulated conditions without shutting down the system.
13. A computer-readable storage medium storing a computer program, characterized in that: When the program is executed by the processor, it implements the steps of the sealing effect evaluation program in the hydrogen-cooled generator split-type base sealing performance evaluation method as described in claim 12.