Method for reinforcing strength of impeller blades

Abstract

The invention discloses an impeller technology, and aims to provide a method for reinforcing the strength of an impeller blade, and the method is characterized by comprising the following steps: S1, designing an impeller structure, and determining the specific shapes and sizes of a front disc, a rear disc and the blade; s2, the arrangement position of a reinforcing ring is determined according to stress analysis of the blade; s3, the number of reinforcing rings is determined according to the size, the shape and the working environment of the blade; s4, designing the shape of the reinforcing ring; s5, selecting a high-strength and corrosion-resistant material as a manufacturing material of the reinforcing ring; s6, adopting a machining mode, including but not limited to welding or bolt connection; s7, the reinforced impeller is tested; s8, adjusting design parameters of the reinforcing ring according to a strength test result; s9, in the batch production process, the impeller with the reinforcing ring installed is detected in a sampling mode; s10, strict quality control measures are taken; the invention is applicable to the technical field of impellers.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of impeller technology, more specifically, it relates to a kind of method for reinforcing the strength of impeller blade. BACKGROUND

[0002] In the field of cooler processing, 2-pole impeller is involved, and the rotating speed is 3000r / min. The impeller blade of high-speed rotation is prone to damage, which causes product quality problems, thereby bringing after-sales maintenance risks and the like. Therefore, it is urgent to design a method for reinforcing the impeller blade, that is, the risk of damage to the impeller blade can be reduced on the basis of the original impeller, thereby avoiding after-sales maintenance risks and the like. SUMMARY

[0003] In view of the deficiencies in the prior art, the purpose of the present application is to provide a method for reinforcing the strength of impeller blade.

[0004] To achieve the above-mentioned purpose, the present application provides the following technical solution: a method for reinforcing the strength of impeller blade, comprising the following steps:

[0005] S1, design the structure of impeller, and determine the specific shape and size of front disc, rear disc and blade; the chord length to thickness ratio of blade is 15:1-20:1;

[0006] S2, determine the setting position of reinforcing ring according to the stress analysis of blade, which is usually located in the middle part of blade where stress is concentrated;

[0007] S3, determine the number of reinforcing rings according to the size, shape and working environment of blade, and the number range is 1-3;

[0008] S4, design the shape of reinforcing ring, specifically including: measuring the curvature radius R of the target reinforcing position of blade; and designing the inner arc surface radius of reinforcing ring according to the curvature radius R, to ensure that the deviation is not more than ±2%; the shape of reinforcing ring is circular or elliptical or arc-shaped, to adapt to the curved surface of blade and ensure close fitting;

[0009] S5, select high-strength, corrosion-resistant materials as the manufacturing material of reinforcing ring, including but not limited to high-strength alloy steel or composite material;

[0010] S6, adopt mechanical processing mode, including but not limited to welding or bolt connection, to firmly fix the reinforcing ring on the blade, and ensure the strength and stability of the connection;

[0011] S7, test the reinforced impeller, simulate the stress distribution under actual working conditions, and ensure that the reinforcing ring can effectively improve the carrying capacity of blade;

[0012] S8. Adjust the design parameters of the reinforcement ring, including but not limited to thickness, material, or fixing method, based on the strength test results, until the test results meet the preset threshold requirements;

[0013] S9. During the mass production process, the impellers after the reinforcement rings are installed shall be inspected by sampling to ensure that they meet the design specifications and quality standards, including but not limited to inspection of size, shape, material, and fixing method;

[0014] S10. Implement strict quality control measures, including regular inspections of the tightness of reinforcement rings, welding quality, and continuous monitoring of the entire production process.

[0015] The present invention is further configured as follows: in S3, the number of reinforcement rings is determined by the following steps:

[0016] First, determine the basic number based on the ratio of blade length L to width W: if L / W ≤ 3, set 1; if 3 < L / W ≤ 5, set 2; if L / W > 5, set 3;

[0017] Then make adjustments based on the wind speed change frequency of the working environment: if the wind speed change frequency is greater than 5 times / min, add 1 to the basic number.

[0018] The present invention is further configured as follows: in S4, the design of the shape of the reinforcement ring is simulated by three-dimensional modeling software to ensure perfect fit with the blade surface and reduce stress concentration.

[0019] The present invention is further configured as follows: in S5, the selection criteria for the reinforcement ring material include:

[0020] The yield strength of the reinforcement ring material shall not be less than 1.5 times that of the blade material;

[0021] The corrosion resistance of the reinforcement ring material must pass the salt spray test and achieve 500 hours of rust-free.

[0022] The present invention is further configured as follows: in said S6, the fixing method of the reinforcement ring is subjected to rigorous process tests to ensure that a good connection state can be maintained under extreme working conditions; if welding fixation is selected, a continuous full welding process is adopted, and the weld width is not less than 1.2 times the thickness of the reinforcement ring; if bolt connection is selected, high-strength bolts of grade 8.8 or above are adopted, and the pre-tightening torque is controlled within the range of ±5% of the design value.

[0023] The present invention is further configured as follows: in S7, the specific testing method includes:

[0024] Carry out acceleration test from 0 to 120% of rated speed on a speed test bench;

[0025] Strain gauges are used to measure stress changes at key locations on the blade.

[0026] The application is further provided that: in the S8, if the test result does not meet the preset threshold requirement, the design parameters of the reinforcing ring need to be adjusted, and the test is performed again;The parameter adjustment process follows the following control judgment method:

[0027] If the maximum stress value exceeds the allowable stress and is <10%, increase the thickness of the reinforcing ring by 10-15%;If it exceeds the allowable stress and is ≥10%, replace it with a higher strength material or redesign the shape of the reinforcing ring, and test again until the test result meets the requirements.

[0028] The application is further provided that: in the S9, the sampling method uses random sampling of 10% of the impeller in each batch for full-size detection, and also needs to undergo independent non-destructive testing, including but not limited to ultrasonic testing, magnetic powder testing, to ensure that there are no internal defects;At the same time, the connecting part of the reinforcing ring and the blade also needs to be tested for tensile strength to ensure that the connecting strength meets the design requirements.

[0029] The application is further provided that: in the S2, during the determination of the position of the reinforcing ring, the stress distribution curve of the blade under different working conditions needs to be analyzed;If the stress distribution curve at a certain position exceeds the preset safety threshold, a reinforcing ring needs to be added at that position;After adding the reinforcing ring, stress simulation analysis needs to be performed again to ensure that the stress state of the entire blade is optimal.

[0030] The beneficial effects of the application are:

[0031] 1.Compared with the prior art, the method for reinforcing the strength of the impeller blade of the application can significantly improve the carrying capacity of the blade under high-strength working environment by accurately designing the structure of the impeller and optimizing the setting of the reinforcing ring;By analyzing the stress of the blade and reasonably setting the position of the reinforcing ring, structural damage caused by stress concentration can be effectively avoided;By selecting high-strength, corrosion-resistant materials, the durability and adaptability of the reinforcing ring are enhanced, ensuring the long-term stable operation of the blade under complex working conditions;Using mechanical processing to fix the reinforcing ring can ensure the stability of the connecting part strength and improve the overall reliability and safety of the blade;This method not only improves the strength of the impeller, but also ensures the quality stability of the impeller during mass production, reducing the loss caused by quality problems.

[0032] 2. In the method for reinforcing the strength of impeller blades of the present invention, the number of reinforcement rings is determined according to the ratio of the length to the width of the blades and the frequency of wind speed changes in the working environment. The number of reinforcement rings can be flexibly adjusted according to different working conditions to ensure that the blades can obtain the best reinforcement effect under various conditions; through this quantitative and precise design, not only the adaptability of the reinforcement rings is improved, but also the overall performance of the impeller is enhanced, avoiding the situation of insufficient blade strength due to insufficient number of reinforcement rings; especially in an environment with frequent wind speed changes, by increasing the number of reinforcement rings, the stability and safety of the impeller are further improved, ensuring the reliable operation of the impeller under extreme working conditions.

[0033] 3. In the present invention, by using three-dimensional modeling software to simulate the design of the reinforcement ring shape, it is ensured that the reinforcement ring can perfectly fit the curved surface of the blade, reducing the inaccurate adaptation that may occur in traditional designs; through precise simulation and optimized design, it is ensured that the reinforcement ring can effectively disperse stress in actual applications, reduce the generation of stress concentration areas, and thus improve the strength and service life of the blade; in addition, three-dimensional modeling can also quickly discover and solve potential problems in the early stages of design, reducing the cost and time waste that may be caused by experimental adjustments and manufacturing processes, and improving design and production efficiency.

[0034] 4. The present invention has a simple and reasonable structure, is easy to manufacture, and is easy to operate. It avoids the defects of the prior art and is suitable for popularization and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 Schematic diagram of the impeller structure.

[0036] Figure 2 Schematic diagram of impeller strength analysis without adding reinforcement ring.

[0037] Figure 3 Schematic diagram of impeller strength analysis for increasing reinforcement ring.

[0038] Figure 1-3 Reference numerals: 1. front disc; 2. rear disc; 3. blade; 4. reinforcement ring. DETAILED DESCRIPTION

[0039] Reference Figure 1-3 The embodiment of the method for reinforcing the strength of impeller blades of the present invention is further described.

[0040] For ease of explanation, spatial relative terms such as "upper", "lower", "left", and "right" are used in the embodiments to illustrate the relationship between one element or feature shown in the figures and another element or feature. It should be understood that, in addition to the orientation shown in the figures, spatial terms are intended to include different orientations of the device in use or operation. For example, if the device in the figure is inverted, the element described as being "under" other elements or features will be positioned "above" other elements or features. Therefore, the exemplary term "under" can include both upper and lower orientations. The device can be positioned in other ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used here can be interpreted accordingly.

[0041] Moreover, relational terms such as “first” and “second” are merely used to distinguish one component from another having the same name, but do not necessarily require or imply any actual relationship or order between these components.

[0042] Figures 1 to 3 A method for reinforcing the strength of an impeller blade is shown, comprising the following steps:

[0043] S1. Design the impeller structure, determining the specific shapes and dimensions of the front disc 1, rear disc 2, and blades 3. The chord-to-thickness ratio of blades 3 should be between 15:1 and 20:1. If the ratio is less than 15:1, the blades 3 are too thick, increasing airflow resistance and reducing efficiency. If the ratio is greater than 20:1, the blades 3 are too thin, resulting in insufficient bending stiffness and easily inducing flutter. Therefore, a ratio of 15:1 to 20:1 is preferred to optimize the balance between aerodynamic performance and structural strength.

[0044] S2. Determine the location of the reinforcement ring 4 based on the stress analysis of the blade 3. The reinforcement ring 4 is usually located in the middle of the blade 3, which is prone to stress concentration.

[0045] S3. Determine the number of reinforcement rings 4 according to the size, shape and working environment of the blade 3, with the number ranging from 1 to 3;

[0046] S4. Designing the shape of the reinforcement ring 4, specifically including: measuring the curvature radius R of the target reinforcement position of the blade 3; and designing the inner arc radius of the reinforcement ring 4 based on the curvature radius R, ensuring that the deviation between the two does not exceed ±2%; the shape of the reinforcement ring 4 is circular, elliptical, or arc-shaped to adapt to the curved surface of the blade 3 and ensure a tight fit;

[0047] S5. Select high-strength, corrosion-resistant materials as the manufacturing material of the reinforcement ring 4, including but not limited to high-strength alloy steel or composite materials;

[0048] S6. Use mechanical processing methods, including but not limited to welding or bolting, to firmly fix the reinforcement ring 4 to the blade 3 to ensure the strength and stability of the connection;

[0049] S7. Testing the reinforced impeller to simulate the stress distribution under actual working conditions to ensure that the reinforcement ring 4 can effectively improve the load-bearing capacity of the blade 3;

[0050] S8. Adjust the design parameters of the reinforcement ring 4, including but not limited to thickness, material, or fixing method, according to the strength test results, until the test results meet the preset threshold requirements;

[0051] S9. During the mass production process, the impeller after the reinforcement ring 4 is installed shall be inspected by sampling to ensure that it meets the design specifications and quality standards, including but not limited to inspection of size, shape, material, and fixing method;

[0052] S10. Implement strict quality control measures, including regular inspections of the tightness of the reinforcement ring 4, welding quality, and continuous monitoring of the entire production process;

[0053] This method can significantly improve the load-bearing capacity of the blade 3 under high-intensity working conditions by accurately designing the impeller structure and optimizing the setting of the reinforcement ring 4; by analyzing the force on the blade 3 and reasonably setting the position of the reinforcement ring 4, it can effectively avoid structural damage caused by stress concentration; by selecting high-strength, corrosion-resistant materials, the durability and adaptability of the reinforcement ring 4 are enhanced, ensuring that the blade 3 can operate stably for a long time under complex working conditions; the reinforcement ring 4 is fixed by mechanical processing to ensure the stability of the strength of the connection part and improve the overall reliability and safety of the blade 3; this method not only improves the strength of the impeller through a series of precise design and testing steps, but also ensures the quality stability of the impeller during mass production, reducing losses caused by quality problems.

[0054] In S3, the number of the reinforcement rings 4 is determined by the following steps:

[0055] First, determine the basic number of blades based on the ratio of the length L to the width W of the blade 3: if L / W ≤ 3, set 1; if 3 < L / W ≤ 5, set 2; if L / W > 5, set 3;

[0056] Then adjust it based on the wind speed change frequency of the working environment: if the wind speed change frequency is greater than 5 times / min, add 1 to the basic number;

[0057] When L / W ≤ 3, a single-ring configuration balances economy and effectiveness; when 3 < L / W ≤ 5, a dual-ring layout addresses moderate bending stress; and when L / W > 5, a triple-ring configuration suppresses torsional deformation of large blades. A compensation mechanism for wind speed variation frequency is superimposed to specifically address the cumulative damage caused by alternating wind loads. This dynamic adjustment strategy overcomes the limitations of the traditional fixed-number model, avoiding redundant reinforcement under low operating conditions while preventing insufficient protection under high dynamic loads, thereby optimizing reinforcement resource allocation.

[0058] By determining the number of reinforcement rings 4 based on the ratio of the length to the width of the blades 3 and the frequency of wind speed changes in the working environment, the number of reinforcement rings 4 can be flexibly adjusted according to different working conditions to ensure that the blades 3 can obtain the best reinforcement effect under various conditions; through this quantitative and precise design, not only the adaptability of the reinforcement rings 4 is improved, but also the overall performance of the impeller is enhanced, avoiding the situation where the strength of the blades 3 is insufficient due to an insufficient number of reinforcement rings 4; especially in an environment where the wind speed changes frequently, by increasing the number of reinforcement rings 4, the stability and safety of the impeller are further improved, ensuring the reliable operation of the impeller under extreme working conditions.

[0059] In said S4, the shape of the reinforcement ring 4 is simulated by 3D modeling software to ensure perfect fit with the curved surface of the blade 3 and reduce stress concentration;

[0060] By using 3D modeling software to simulate the shape of the reinforcement ring 4, it is ensured that the reinforcement ring 4 can perfectly fit the curved surface of the blade 3, reducing the inaccurate fit that may occur in traditional designs. Through precise simulation and optimized design, it is ensured that the reinforcement ring 4 can effectively disperse stress in actual use, reducing the occurrence of stress concentration areas, thereby improving the strength and service life of the blade 3. In addition, 3D modeling can quickly identify and resolve potential problems in the early stages of design, reducing the cost and time waste that may occur during experimental adjustments and manufacturing processes, and improving design and production efficiency.

[0061] In S5, the selection criteria for the material of the reinforcement ring 4 include:

[0062] The yield strength of the material of the reinforcement ring 4 is not less than 1.5 times that of the material of the blade 3;

[0063] The corrosion resistance of the reinforcement ring 4 material must pass the salt spray test and achieve 500 hours of rust-free;

[0064] The material selection for the reinforcement ring 4 requires a yield strength of no less than 1.5 times that of the blade 3 material, and ensures that its corrosion resistance meets certain standards. This significantly improves the impeller's fatigue and corrosion resistance in harsh operating environments. The increased yield strength allows the reinforcement ring 4 to withstand greater loads, extending the service life of the blades 3. The corrosion resistance is verified through salt spray testing and other means to ensure that the reinforcement ring 4 can operate stably and long-term in humid, high-salt environments without being affected by corrosion, thereby ensuring the reliability and safety of the impeller.

[0065] In S6, the fixing method of the reinforcement ring 4 has undergone rigorous process testing to ensure that it can maintain a good connection state under extreme working conditions; if welding is used for fixing, a continuous full welding process is adopted, and the weld width is not less than 1.2 times the thickness of the reinforcement ring 4; if bolt connection is used, high-strength bolts of grade 8.8 or above are used, and the pre-tightening torque is controlled within the range of ±5% of the design value;

[0066] Strict process tests have been conducted on the fixing method of the reinforcement ring 4 to ensure that the connection can be maintained in a stable state both under extreme working conditions and during long-term use. Whether it is welding or bolting, there are clear quality standards to ensure the connection strength between the reinforcement ring 4 and the blade 3. The strength of the welded joint is ensured by the requirements of the welding process. When using high-strength bolts for connection, strict control of the pre-tightening torque ensures the stability of the connection. In this way, the blade 3 can withstand greater impact loads during operation without causing the reinforcement ring 4 to loosen or fall off, further improving the safety and service life of the impeller.

[0067] In S7, the specific testing method includes:

[0068] Carry out acceleration test from 0 to 120% of rated speed on a speed test bench;

[0069] Strain gauges were used to measure stress changes at key locations of blade 3;

[0070] By conducting accelerated tests on a speed test bench and measuring the stress changes in blade 3 using strain gauges, the stress conditions of blade 3 in an actual working environment can be accurately simulated, ensuring that the reinforcement ring 4 can effectively disperse stress under various working conditions, thereby improving the load-bearing capacity and fatigue resistance of blade 3. The stepped speed test covers the overspeed protection boundary and exposes resonance risk points. The strain gauge network captures the stress field distribution in real time and accurately locates reinforcement blind spots. Through testing, potential weaknesses can be discovered, and the design parameters of reinforcement ring 4 can be adjusted in a timely manner to achieve the optimal reinforcement effect. In addition, this testing method has high reliability and repeatability, ensuring that the reinforced impeller meets the expected strength requirements during the production process.

[0071] In S8, if the test result does not meet the preset threshold requirement, the design parameters of the reinforcement ring 4 need to be adjusted and the test needs to be repeated. The process of adjusting the parameters follows the following control judgment method:

[0072] If the maximum stress value exceeds the allowable stress and is less than 10%, increase the thickness of the reinforcement ring 4 by 10-15%; if it exceeds the allowable stress and is ≥10%, replace it with a higher strength material or redesign the shape of the reinforcement ring 4 and test again until the test results meet the requirements;

[0073] Through detailed test results and gradual adjustment of design parameters, the performance of the reinforcement ring 4 is ensured to always meet the requirements. By adjusting the thickness or material selection of the reinforcement ring 4 based on the stress test results, design deficiencies can be discovered in a timely manner and corresponding optimization measures can be taken to avoid structural damage caused by unreasonable design. In particular, when the strength test does not meet the requirements, the performance of the reinforcement ring 4 can be further improved by replacing the material or adjusting the shape, thereby ensuring the safety and reliability of the blade 3 under extreme operating conditions.

[0074] In S9, the sampling method is to randomly select 10% of the impellers from each batch for full-size inspection. At the same time, they are also required to undergo independent non-destructive testing, including but not limited to ultrasonic testing and magnetic particle testing, to ensure that there are no internal defects. At the same time, the connection between the reinforcement ring 4 and the blade 3 is also required to be tensile tested to ensure that the connection strength meets the design requirements.

[0075] Random sampling and full-size inspection and non-destructive testing ensure that impellers in mass production meet design specifications and quality standards. Tensile testing of the connection between the reinforcement ring 4 and the blade 3 ensures the strength of the connection, preventing the overall performance of the impeller from being affected by defective products during the production process. Non-destructive testing can effectively detect defects within the blade 3, thereby improving product quality assurance. This quality control method implements the "geometry-metallurgy-strength" trinity control, which can significantly reduce quality problems that occur during the production process and improve the overall stability of the product.

[0076] In the process of determining the position of the reinforcement ring 4 in step S2, it is necessary to analyze the force distribution curve of the blade 3 under different working conditions; if the force distribution curve at a certain position exceeds the preset safety threshold, a reinforcement ring 4 needs to be added at that position; after adding the reinforcement ring 4, the force simulation analysis needs to be re-performed to ensure that the force state of the entire blade 3 is optimized;

[0077] By analyzing the force distribution curve of the blade 3 under different working conditions, the position of the reinforcement ring 4 can be determined more accurately, avoiding the insufficient or unreasonable reinforcement that may occur in the traditional method; by adding the reinforcement ring 4 and re-performing the force simulation analysis, the force state of the entire blade 3 is ensured to be optimal, avoiding the damage of the blade 3 due to insufficient local reinforcement; in addition, this method can flexibly respond to changes under different working conditions, improve the adaptability and safety of the impeller in different working environments, and ensure the long-term stable operation of the blade 3.

[0078] like Figure 2 and Figure 3 As shown by Figure 2 The strength analysis diagram of the impeller without the reinforcement ring 4 shows that the stress in the middle of the blade 3 is relatively large; Figure 3 From the schematic diagram of the impeller strength analysis with the reinforcement ring 4 added, it can be seen that after adding the reinforcement ring 4 to the middle part of the blade 3, the stress of the blade 3 can be reduced; thereby, the strength of the blade 3 is strengthened, and the risk of damage to the impeller blade 3 is reduced, thereby eliminating the risk of after-sales maintenance.

[0079] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Common changes and substitutions made by those skilled in the art within the scope of the technical solution of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for reinforcing the strength of an impeller blade, characterized by: The following steps are involved: S1. Design the impeller structure and determine the specific shapes and sizes of the front disc (1), rear disc (2) and blades (3); the chord length to thickness ratio of the blades (3) is 15:1-20:1; S2. Determine the location of the reinforcement ring (4) based on the force analysis of the blade (3), which is usually located in the middle of the blade (3) where stress concentration is likely to occur; S3. Determine the number of reinforcement rings (4) according to the size, shape and working environment of the blade (3), with the number ranging from 1 to 3; S4. Designing the shape of the reinforcement ring (4), specifically comprising: measuring the curvature radius R of the target reinforcement position of the blade (3); and designing the inner arc radius of the reinforcement ring (4) according to the curvature radius R, ensuring that the deviation between the two does not exceed ±2%; the shape of the reinforcement ring (4) is circular, elliptical or arc-shaped to adapt to the curved surface of the blade (3) to ensure a tight fit; S5. Selecting a high-strength, corrosion-resistant material as the material for the reinforcement ring (4), including but not limited to high-strength alloy steel or composite materials; S6. Using mechanical processing methods, including but not limited to welding or bolting, to firmly fix the reinforcement ring (4) on the blade (3) to ensure the strength and stability of the connection; S7. Testing the reinforced impeller to simulate the stress distribution under actual working conditions to ensure that the reinforcement ring (4) can effectively improve the load-bearing capacity of the blade (3); S8. Adjusting the design parameters of the reinforcement ring (4), including but not limited to thickness, material, or fixing method, according to the strength test results, until the test results meet the preset threshold requirements; S9. During the batch production process, the impeller after the reinforcement ring (4) is installed is inspected by sampling to ensure that it meets the design specifications and quality standards, including but not limited to inspection of size, shape, material, and fixing method; S10. Implement strict quality control measures, including regular inspection of the tightness of the reinforcement ring (4), welding quality, and continuous monitoring of the entire production process.

2. A method for reinforcing the strength of impeller blades according to claim 1, characterized in that: In said S3, the number of the reinforcement rings (4) is determined by the following steps: First, the basic number is determined according to the ratio of the length L to the width W of the blade (3): if L / W≤3, 1 is set; if 3<L / W≤5, 2 are set; if L / W>5, 3 are set; Then make adjustments based on the wind speed change frequency of the working environment: if the wind speed change frequency is greater than 5 times / min, add 1 to the basic number.

3. The method for reinforcing the strength of impeller blades according to claim 1, characterized in that: In the above-mentioned S4, the shape of the reinforcement ring (4) is simulated by three-dimensional modeling software to ensure perfect fit with the curved surface of the blade (3) and reduce stress concentration.

4. The method for reinforcing the strength of impeller blades according to claim 1, characterized in that: In said S5, the selection criteria of the material of the reinforcement ring (4) include: The yield strength of the material of the reinforcement ring (4) is not less than 1.5 times that of the material of the blade (3); The corrosion resistance of the reinforcement ring (4) material must pass a salt spray test and be free of rust for 500 hours.

5. The method for reinforcing the strength of impeller blades according to claim 1, characterized in that: In the above-mentioned S6, the fixing method of the reinforcement ring (4) has been subjected to strict process tests to ensure that a good connection state can be maintained under extreme working conditions; if welding is used for fixing, a continuous full welding process is adopted, and the weld width is not less than 1.2 times the thickness of the reinforcement ring (4); if bolt connection is used, high-strength bolts of grade 8.8 or above are used, and the pre-tightening torque is controlled within the range of ±5% of the design value.

6. The method for reinforcing the strength of impeller blades according to claim 1, characterized in that: In S7, the specific testing method includes: Carry out acceleration test from 0 to 120% of rated speed on a speed test bench; Strain gauges are used to measure stress changes at key positions of the blade (3).

7. The method for reinforcing the strength of impeller blades according to claim 1, characterized in that: In said S8, if the test result does not meet the preset threshold requirement, the design parameters of the reinforcement ring (4) need to be adjusted and the test is repeated; the process of adjusting the parameters follows the following control judgment method: If the maximum stress value exceeds the allowable stress and is less than 10%, the thickness of the reinforcement ring (4) is increased by 10-15%; If the allowable stress is exceeded and is ≥10%, replace the material with a higher strength or redesign the shape of the reinforcement ring (4) and perform the test again until the test result meets the requirements.

8. The method for reinforcing the strength of impeller blades according to claim 1, characterized in that: In said S9, the sampling method is to randomly select 10% of the impellers in each batch for full-size inspection, and at the same time, they are also required to undergo independent non-destructive inspection, including but not limited to ultrasonic inspection and magnetic particle inspection, to ensure that there are no internal defects; at the same time, the connection between the reinforcement ring (4) and the blade (3) is also required to be tensile tested to ensure that the connection strength meets the design requirements.

9. The method for reinforcing the strength of impeller blades according to claim 1, characterized in that: In the process of determining the position of the reinforcement ring (4) in S2, it is necessary to analyze the force distribution curve of the blade (3) under different working conditions; if the force distribution curve at a certain position exceeds a preset safety threshold, a reinforcement ring (4) needs to be added at that position; after the reinforcement ring (4) is added, the force simulation analysis needs to be re-performed to ensure that the force state of the entire blade (3) reaches the optimal state.

Images