Reliability Testing Methods and Systems for De-icing Blowers

Abstract

This invention provides a reliability testing method and system for a de-icing blower, comprising: detecting the connection strength value of the blades and impeller and obtaining a first threshold; determining whether the connection strength of the blades and impeller meets the standard based on the connection strength value and the first threshold; detecting the blade strength value of the blades and obtaining a second threshold; determining whether the blade strength meets the standard based on the blade strength value and the second threshold; simulating actual operating conditions and detecting the impeller strength when the connection strength and blade strength meet the standard; and determining whether the reliability of the blower under test meets the standard by combining the connection strength value, blade strength value, and impeller strength. This invention evaluates the reliability of the blower under test through tests of three dimensions: connection strength, blade strength, and impeller strength. This makes the reliability evaluation of the blower under test more accurate and comprehensive, and can take into account the special operating environment of the power generation blades of the blower under test, thus broadening the application scenarios for the reliability evaluation of the blower under test.

Description

Technical Field

[0001] This invention belongs to the field of wind power de-icing technology, and particularly relates to a reliability testing method and system for de-icing blowers. Background Technology

[0002] With the continuous expansion of wind power installed capacity, a large number of wind turbines are being built in heavily icing areas, where the turbine blades are extremely prone to icing during winter. Icing of the turbine blades increases the load on the blades and the turbine shaft, alters the airfoil of the blades, directly leads to a reduction in the lifespan of related components, a decrease in expected output, and seriously affects the safe and reliable operation of the wind turbine system.

[0003] Gas-heated de-icing is one of the reliable de-icing methods for generator blades. Its principle involves a de-icing blower inside the generator blade blowing hot air into the inner cavity, thereby heating the blade wall and achieving de-icing. As a key component of gas-heated de-icing equipment, the performance and reliability of the de-icing blower directly determine the de-icing effect in winter. However, due to the special operating environment of the generator blades in the de-icing blower, there is currently a lack of effective methods for reliability testing of de-icing blowers. Summary of the Invention

[0004] The main objective of this invention is to propose a reliability testing method and system for de-icing blowers, in order to solve the technical problem that there is no effective method for testing the reliability of de-icing blowers in the prior art.

[0005] To achieve the above objectives, the present invention provides a reliability testing method for a de-icing blower, used for a blower under test, the blower under test including an impeller and blades connected to the impeller, the reliability testing method for the de-icing blower including:

[0006] Detect the connection strength value between the blade and the impeller and obtain the first threshold;

[0007] The connection strength between the blade and the impeller is determined based on the connection strength value and the first threshold to determine whether the connection strength meets the standard.

[0008] The leaf strength value of the blade is detected and a second threshold is obtained;

[0009] The blade strength is determined to meet the standard based on the blade strength value and the second threshold.

[0010] If the connection strength and the blade strength meet the standards, simulate actual operating conditions and test the impeller strength.

[0011] The reliability of the blower under test is determined by combining the connection strength value, the blade strength value, and the impeller strength.

[0012] In this embodiment of the invention, detecting the connection strength value between the blade and the impeller and obtaining the first threshold includes:

[0013] Obtain the initial appearance image of the blower under test before testing;

[0014] The blower under test is fixed to a tensile testing machine, and the tensile testing machine is controlled to apply a static load to the blades along the radial direction of the blower under test, and a current appearance image of the blower under test is obtained.

[0015] The static load failure value of the blower under test is obtained based on the initial appearance image and the current appearance image, and the static load failure value is used as the connection strength value.

[0016] Obtain a preset static load as the first threshold.

[0017] In this embodiment of the invention, obtaining the static load failure value of the blower under test based on the initial appearance image and the current appearance image includes:

[0018] By comparing the current appearance image with the initial appearance image, the current state of the blower under test is obtained;

[0019] The static load failure value of the blower under test is determined based on the current state of the blower under test.

[0020] In this embodiment of the invention, determining the static load failure value of the blower under test based on its current state includes:

[0021] The blower under test is determined to be in a static load failure state. The current static load of the tensile testing machine is obtained and the current static load is used as the static load failure value.

[0022] In this embodiment of the invention, detecting the leaf strength value of the leaf and obtaining the second threshold includes:

[0023] The blower to be tested was fixed on the vibration test bench;

[0024] Acquire preset vibration parameters and control the vibration test bench to simulate vibration according to the preset vibration parameters; control the blower under test to run at rated speed in the simulated vibration environment to obtain the maximum amplitude of the blade tip vibration of the blower under test, and use the maximum amplitude of the blade tip vibration as the blade strength value;

[0025] The preset blade vibration amplitude is obtained as the second threshold.

[0026] In this embodiment of the invention, the steps of obtaining preset vibration parameters and controlling the vibration test bench to simulate vibration according to the preset vibration parameters; controlling the blower under test to run at rated speed in a simulated vibration environment to obtain the maximum amplitude of the blade tip vibration of the blower under test, and using the maximum amplitude of the blade tip vibration as the blade strength value include:

[0027] The vibration test bench is controlled to vibrate the blower under test along the X-axis, Y-axis and Z-axis directions with a preset acceleration within a preset vibration frequency range;

[0028] The maximum axial displacement of the blade tip and the maximum circumferential displacement of the blade tip within a preset vibration period of the blower under test are obtained and used as the maximum amplitude of the blade tip vibration.

[0029] In this embodiment of the invention, a blade tip timing sensor and a key phase sensor are installed inside the volute of the blower under test. The step of obtaining the maximum axial displacement of the blade tip and the maximum circumferential displacement of the blade tip within a preset vibration cycle includes:

[0030] The blade tip axial amplitude variation line and blade tip circumferential amplitude variation line of the blower under test are detected by the blade tip timing sensor and the key phase sensor.

[0031] Based on the axial amplitude variation line of the blade tip and the circumferential amplitude variation line of the blade tip, the maximum axial displacement of the blade tip and the maximum circumferential displacement of the blade tip of the blower under test within a preset vibration period are determined.

[0032] In this embodiment of the invention, the blower under test is used to be installed on the wind turbine blades of a wind turbine generator to de-ice the wind turbine blades. The step of simulating actual operating conditions and detecting the impeller strength includes:

[0033] Obtain the actual installation state of the blower under test, and fix the blower under test on the rotary test bench to simulate the actual installation state.

[0034] Obtain the actual operating parameters of the wind turbine generator, determine the test parameters of the rotating test bench based on the actual operating parameters, and drive the rotating test bench to rotate with the same centrifugal force using the test parameters;

[0035] The blower under test is controlled to run at a preset overspeed rate for a preset duration, and the overspeed deformation of the blower under test is obtained.

[0036] The impeller strength is determined based on the overspeed deformation.

[0037] In this embodiment of the invention, controlling the blower under test to run at a preset overspeed rate for a preset duration and obtaining the overspeed deformation of the blower under test includes:

[0038] Obtain the initial appearance image of the blower under test before testing;

[0039] Control the blower under test to run at a preset overspeed rate for a preset time, and acquire an overspeed appearance image of the blower under test;

[0040] The overspeed deformation of the blower under test is obtained based on the initial appearance image and the overspeed appearance image.

[0041] This invention also proposes a reliability testing system for a de-icing blower, the system comprising:

[0042] Tensile testing machine, used to test the connection strength of blades and impellers;

[0043] A vibration test bench is used to test the blade strength value of the blade.

[0044] A rotating test bench is used for testing the impeller strength of impellers.

[0045] The controller is electrically connected to the tensile testing machine, the vibration testing bench, and the rotation testing bench. The controller is used to perform the reliability test method for the de-icing blower as described above.

[0046] Through the above technical solution, the reliability testing method for de-icing blowers provided in this embodiment of the invention has the following beneficial effects:

[0047] When using a reliability testing method for de-icing blowers, the blade strength and impeller connection strength can be tested first. If both blade and connection strength meet the standards, the impeller strength can then be tested. The testing order for blade and connection strength can be preset. Testing blade and connection strength according to this preset order ensures that the impeller strength is tested only after the specific components have passed the tests, saving testing time and improving efficiency. If at least one of the connection strength, blade strength, and impeller strength values ​​fails to meet the standard, the blower's reliability is deemed substandard. If all three values ​​meet the standard, the blower's reliability is deemed satisfactory, ensuring the accuracy of the reliability evaluation. This invention evaluates the reliability of the blower under test by testing three dimensions: connection strength, blade strength, and impeller strength. This makes the reliability evaluation of the blower under test more accurate and comprehensive, and can take into account the special operating environment of the power generation blades of the blower under test, thus making the application scenarios of the reliability evaluation of the blower under test more extensive.

[0048] Other features and advantages of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0049] The accompanying drawings are provided to illustrate the invention and form part of the specification. They are used together with the following detailed description to explain the invention, but do not constitute a limitation thereof. In the drawings:

[0050] Figure 1 This is a flowchart illustrating a reliability testing method for a de-icing blower according to an embodiment of the present invention;

[0051] Figure 2 This is a schematic diagram of the testing fixture structure in a de-icing blower reliability testing system according to an embodiment of the present invention.

[0052] Detailed Implementation

[0053] The present invention will be described below with reference to the accompanying drawings.

[0054] Specific embodiments are described in detail below. It should be understood that the specific embodiments described herein are for illustrative and explanatory purposes only and are not intended to limit the scope of the invention.

[0055] The following describes a reliability testing method for a de-icing blower according to the present invention with reference to the accompanying drawings.

[0056] In an embodiment of the present invention, a reliability testing method for a de-icing blower is used for a blower under test, the blower under test including an impeller 200 and blades connected to the impeller 200, such as... Figure 1 As shown, the reliability test method for de-icing blowers includes:

[0057] Step S1: Detect the connection strength value between the blade and the impeller 200 and obtain the first threshold.

[0058] Step S2: Determine whether the connection strength between the blade and the impeller 200 meets the standard based on the connection strength value and the first threshold.

[0059] If the connection strength value is not lower than the first threshold, the connection strength can be determined to meet the standard; if the connection strength value is lower than the first threshold, the connection strength can be determined to fail to meet the standard.

[0060] Step S3: Detect the leaf strength value of the leaf and obtain the second threshold;

[0061] Step S4: Determine whether the leaf strength meets the standard based on the leaf strength value and the second threshold.

[0062] If the leaf strength value does not exceed the second threshold, the leaf strength can be determined to meet the standard. If the leaf strength value exceeds the second threshold, the leaf strength can be determined to fail to meet the standard. The leaf strength value can be the maximum amplitude of the leaf tip vibration.

[0063] Step S5: Assuming that the connection strength and blade strength meet the standards, simulate actual operating conditions and test the impeller strength of impeller 200;

[0064] Step S6: Combine the connection strength value, blade strength value, and impeller strength to determine whether the reliability of the blower under test meets the standard;

[0065] If all three criteria are met, the reliability of the blower under test can be confirmed.

[0066] Understandably, the blower under test in this embodiment is mainly used as a de-icing blower for de-icing wind turbines, and the first threshold and the second threshold can be preset.

[0067] When using the de-icing blower reliability testing method of this embodiment to test the reliability of the blower under test, the blade strength and the connection strength of the blade and impeller 200 can be tested first. If both the blade strength and connection strength meet the standards, the impeller strength of the blower under test can be tested. The testing order of blade strength and connection strength can be preset. Testing the blade strength and connection strength according to the preset testing order ensures that the impeller strength is tested in actual operation simulation only after the specific components have passed the test, which saves testing time and improves testing efficiency. If at least one of the connection strength value, blade strength value, and impeller strength fails to meet the standard, the reliability of the blower under test can be determined to be substandard. If all three of the connection strength value, blade strength value, and impeller strength meet the standard, the reliability of the blower under test can be determined to be standard, ensuring the accuracy of the reliability evaluation of the blower under test. In this embodiment, the reliability of the blower under test is evaluated by testing three dimensions: connection strength, blade strength, and impeller strength. This makes the reliability evaluation of the blower under test more accurate and comprehensive, and can take into account the special operating environment of the power generation blades of the blower under test, thus making the application scenarios of the reliability evaluation of the blower under test more extensive.

[0068] Specifically, detecting the connection strength value between the blade and the impeller 200 and obtaining the first threshold includes:

[0069] Obtain the initial appearance image of the blower under test before testing;

[0070] The blower under test is fixed to the tensile testing machine, and the tensile testing machine is controlled to apply static load to the blower blades radially (i.e., outward from the center of the impeller 200) and the current appearance image of the blower under test is obtained.

[0071] The static load failure value of the blower under test is obtained based on the initial appearance image and the current appearance image, and the static load failure value is used as the connection strength value.

[0072] Obtain a preset static load as the first threshold.

[0073] It should be noted that before testing the blade strength and connection strength, the surface smoothness of the impeller 200 can be determined by checking for burrs, cracks, etc., using an initial appearance image. The initial appearance image can also be used to check for welding at the joint between the blades and the impeller 200, and whether the blade clips are properly riveted, to determine if the connection completion of the blower under test meets the standards. If the surface smoothness of the impeller 200 and the connection completion of the blower under test both meet the standards, the blower under test can be determined to meet the reliability test conditions, and subsequent blade strength, connection strength, and impeller strength tests can be performed. Determining whether the blower under test meets the reliability test conditions before testing the strength of specific components avoids errors in reliability evaluation caused by testing defective products.

[0074] It should be noted that the first threshold can be 4000N. If the static load failure value is determined to be no less than 4000N, the blade strength of the blower under test can be determined to meet the standard. If the static load failure value is determined to be less than 4000N, the blade strength of the blower under test can be determined to fail to meet the standard.

[0075] In one embodiment, obtaining the static load failure value of the blower under test based on the initial appearance image and the current appearance image includes:

[0076] By comparing the current appearance image with the initial appearance image, the current state of the blower under test can be obtained;

[0077] Determine the static load failure value of the blower under test based on its current state.

[0078] After the blower under test is fixed, a tensile testing machine can be used to slowly load the blower. Specifically, a static load of 200N can be increased every 60 seconds, and the static load at each time point is recorded in real time. In this embodiment, by acquiring the static load applied by the tensile testing machine in real time, the maximum static load of the blades in the direction of centrifugal force is checked. By comparing the current appearance image and the initial appearance image, the state of the blower under test under different static loads can be determined, and the maximum static load that the blower under test can withstand can be determined as the static load failure value. In one embodiment, by comparing the current appearance image and the initial appearance image, it can be determined that the blower under test has cracked at the joint under static load. The cracking at the joint under static load can be determined by comparing the edge or locating the joint, and the static load failure value can be accurately obtained.

[0079] Understandably, determining the static load failure value of the blower under test based on its current state includes:

[0080] To determine if the blower under test is in a static load failure state, obtain the current static load of the tensile testing machine and use the current static load as the static load failure value.

[0081] In this embodiment, the edge comparison or connection shape comparison between the current appearance image and the initial appearance image can be used to determine that the blower under test has cracked at the connection under static load, and the blower under test is in a static load failure state. The current static load of the tensile testing machine can be obtained as the static load failure value.

[0082] In this embodiment of the invention, detecting the leaf strength value of the leaf and obtaining the second threshold includes:

[0083] Fix the blower to be tested on the vibration test bench;

[0084] Obtain preset vibration parameters and control the vibration test bench to simulate vibration according to the preset vibration parameters; control the blower under test to run at rated speed in the simulated vibration environment to obtain the maximum amplitude of blade tip vibration of the blower under test, and take the maximum amplitude of blade tip vibration as the blade strength value;

[0085] The preset blade vibration amplitude is obtained as the second threshold.

[0086] In this embodiment, a vibration test bench is used to simulate vibration of the blower. The blower under test is controlled to run at its rated speed in a simulated vibration environment. The maximum amplitude of the blade tip vibration of the blower under test within a preset vibration cycle can be obtained, and the maximum amplitude of the blade tip vibration is used as the blade strength value. By combining the long-term constant centrifugal force and the random frequency amplitude vibration environment, the static load of the blade and the operation of the blade tip vibration parameters can be comprehensively examined, and the reliability of the blower under test can be evaluated more comprehensively.

[0087] In one embodiment, preset vibration parameters are obtained and a vibration test bench is controlled to simulate vibration according to the preset vibration parameters; the blower under test is controlled to run at its rated speed in a simulated vibration environment to obtain the maximum amplitude of the blade tip vibration of the blower under test, and the maximum amplitude of the blade tip vibration is used as the blade strength value, including:

[0088] The vibration test bench is controlled to vibrate the blower under test along the X-axis, Y-axis and Z-axis with a preset acceleration within a preset vibration frequency range;

[0089] The maximum axial displacement and the maximum circumferential displacement of the blade tip of the blower under test within a preset vibration period are obtained and used as the maximum amplitude of the blade tip vibration.

[0090] Specifically, the vibration test bench can be controlled to vibrate the blower under test along the X, Y, and Z axes. The preset vibration frequency range can be 10Hz~150Hz, the preset acceleration can be 2g, and the number of frequency sweeps can be higher than 20. If the maximum axial displacement of the blade tip does not exceed 0.5mm and the maximum circumferential displacement of the blade tip does not exceed 1mm within the preset vibration period, then the blade strength is determined to meet the standard. In this embodiment, the maximum axial displacement and the maximum circumferential displacement of the blade tip are used as the maximum amplitude of the blade tip vibration, which can comprehensively judge the axial and circumferential strength of the blade tip, and evaluate whether the blade strength is qualified from multiple dimensions.

[0091] Understandably, the blower under test has a blade tip timing sensor and a key phase sensor installed inside its casing. The maximum axial displacement and maximum circumferential displacement of the blade tips within a preset vibration cycle are obtained, including:

[0092] The axial and circumferential amplitude variation lines of the blade tip of the blower under test are detected by a blade tip timing sensor and a key phase sensor.

[0093] Based on the axial and circumferential amplitude variation lines of the blade tip, the maximum axial displacement and maximum circumferential displacement of the blade tip of the blower under test within the preset vibration period are determined.

[0094] A blade tip timing sensor detects the axial amplitude of the blade tip of the blower under test, while a key phase sensor detects the circumferential amplitude of the blade tip. By combining the axial and circumferential amplitudes of the blade tip with a timeline, the axial amplitude variation line and the circumferential amplitude variation line can be plotted. The highest point in the axial amplitude variation line can be determined as the maximum axial displacement of the blade tip, and the highest point in the circumferential amplitude variation line can be determined as the maximum circumferential displacement of the blade tip.

[0095] In this embodiment of the invention, the blower under test is used to be installed on the wind turbine blades of a wind turbine generator to de-ice the blades, simulating actual operating conditions and testing the impeller strength of the impeller 200, including:

[0096] Obtain the actual installation state of the blower under test, and fix the blower under test on the rotary test bench to simulate the actual installation state.

[0097] Obtain the actual operating parameters of the wind turbine, determine the test parameters of the rotating test bench based on the actual operating parameters, and drive the rotating test bench to rotate with the same centrifugal force using the test parameters;

[0098] Control the blower under test to run at a preset overspeed rate for a preset time, and obtain the overspeed deformation of the blower under test;

[0099] The impeller strength is determined based on the overspeed deformation.

[0100] The plane of rotation, which determines the actual operating state of the blower under test, is perpendicular to the horizontal plane. This plane of rotation can simulate the actual operating state of the blower when installed on a wind turbine. The plane of rotation is perpendicular to the horizontal plane. According to the formula: F=mω 2 r, obtain the rotational speed of the wind turbine generator, and calculate the rotational speed under the same centrifugal force by comparing the rotational radius of the blower under test on the rotating test bench with the actual rotational radius of the rotating test bench in the generator blades during the test. This speed is used as the test speed of the rotating test bench and as the test parameter. The blower under test is subjected to an overspeed test in a vertical plane rotation state, with a running time of not less than 180s, and the preset overspeed rate can be set in advance.

[0101] In this embodiment of the invention, the overspeed deformation includes at least the amount of weld cracks, anchor node cracks, and diameter deformation of the impeller 200. Specifically, the overspeed deformation can be determined by acquiring an initial appearance image before testing, acquiring an overspeed appearance image of the blower under test in real time during the impeller strength test, and comparing the initial appearance image and the final overspeed appearance image. If scanning the final overspeed appearance image confirms that there are no cracks at the weld points and anchor nodes on the impeller 200 of the blower under test, and the diameter deformation of the impeller 200 is not higher than 5%, then the blade strength is considered qualified.

[0102] In this embodiment of the invention, controlling the blower under test to run at a preset overspeed rate for a preset duration and obtaining the overspeed deformation of the blower under test includes:

[0103] Obtain the initial appearance image of the blower under test before testing;

[0104] Control the blower under test to run at a preset overspeed rate for a preset duration, and acquire an overspeed appearance image of the blower under test;

[0105] The overspeed deformation of the blower under test is obtained from the initial appearance image and the overspeed appearance image.

[0106] Specifically, the overspeed deformation can be obtained by acquiring an initial appearance image before testing, and acquiring an overspeed appearance image of the blower under test in real time during the impeller strength test. By comparing the initial appearance image and the final overspeed appearance image, the overspeed deformation of the blower under test can be obtained. This embodiment fully considers the special operating conditions of the blower rotating with the wind turbine. Under the long-term constant centrifugal force and random frequency amplitude vibration environment, by comprehensively examining the static load of the blades and the maximum amplitude of the blade tip vibration, the reliability of the impeller 200 of the blower under test can be effectively evaluated.

[0107] In this embodiment, the connection strength is evaluated by detecting the maximum static load of the blade in the centrifugal force direction. Under vibration, the blower under test is controlled to run continuously at the rated speed, and the blade tip vibration is checked to evaluate whether the blade strength meets the standard. On this basis, the blower under test is placed on a rotating test platform with the rotating plane perpendicular to the horizontal plane. After the impeller 200 runs at overspeed, the impeller strength of the impeller 200 is checked. The reliability of the blower under test can be evaluated from multiple dimensions, avoiding inaccuracies caused by evaluation from a single dimension.

[0108] This invention also proposes a reliability testing system for de-icing blowers, the system comprising:

[0109] Tensile testing machine, used to test the connection strength of blades and impellers 200;

[0110] Vibration test bench, used for testing the blade strength value;

[0111] A rotating test bench is used for impeller strength testing of impeller 200.

[0112] The controller, tensile testing machine, vibration testing bench, and rotary testing bench are all electrically connected to the controller. The controller is used to control the tensile testing machine, vibration testing bench, and rotary testing bench to perform the de-icing blower reliability test method described above. Understandably, in this embodiment, the tensile testing machine can apply tensile force to the blower under test, the vibration testing bench can vibrate the blower under test (using existing vibration structures), and the rotary testing bench can simulate the actual rotational state of a wind turbine generator to simulate special operating conditions for the blower under test. The rotary testing bench may include a rotary motor, rotary blades, and a rotary shaft.

[0113] like Figure 2 As shown, in one embodiment, the de-icing blower reliability testing system further includes a testing fixture 100 for fixing the blower under test to a tensile testing machine. The testing fixture 100 may include a fixed disc 1 and a connecting plate 3 connected to the tensile testing machine. The fixed disc 1 includes two limiting plates 11, and a limiting space 12 for limiting the impeller 200 is formed between the two limiting plates 11, which can limit the blower under test along the axial direction of the rotating shaft 210. The upper end of the connecting plate 3 can be connected to the rotating shaft 210 of the impeller 200, and the lower end can be connected to the tensile testing machine. There can be two connecting plates 3, and the two connecting plates 3 can be arranged opposite each other along the axial direction of the rotating shaft 210. The testing fixture 100 has a simple structure and is easy to assemble, which can improve the testing efficiency.

[0114] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0115] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0116] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0117] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A de-icing blower reliability test method for a blower under test, the blower under test comprising an impeller and vanes connected to the impeller, the method comprising: The deicing blower reliability test method comprises: detecting a connection strength value of the blade and the impeller and obtaining a first threshold value; determining whether the connection strength of the blade and the impeller meets the standard according to the connection strength value and the first threshold value; detecting a blade strength value of the blade and obtaining a second threshold value; determining whether the blade strength of the blade meets the standard according to the blade strength value and the second threshold value; determining the connection strength and the blade strength meet the standard, simulating an actual operation condition and detecting an impeller strength of the impeller; combining the connection strength value, the blade strength value and the impeller strength to determine whether the reliability of the to-be-tested blower meets the standard; the detecting a connection strength value of the blade and the impeller and obtaining a first threshold value comprises: obtaining an initial appearance image of the to-be-tested blower before testing; fixing the to-be-tested blower on a tensile testing machine, controlling the tensile testing machine to apply a static load to the blade along the radial direction of the blade of the to-be-tested blower, and obtaining a current appearance image of the to-be-tested blower; obtaining a static load failure value of the to-be-tested blower according to the initial appearance image and the current appearance image, and taking the static load failure value as a connection strength value; obtaining a preset static load as a first threshold value; the detecting a blade strength value of the blade and obtaining a second threshold value comprises: fixing the to-be-tested blower on a vibration test bench; obtaining a preset vibration parameter and controlling the vibration test bench to perform simulated vibration according to the preset vibration parameter; controlling the to-be-tested blower to operate at a rated speed in the simulated vibration environment to obtain a maximum amplitude of blade tip vibration of the to-be-tested blower, and taking the maximum amplitude of blade tip vibration as a blade strength value; obtaining a preset blade vibration amplitude of the blade as a second threshold value; the to-be-tested blower is used to be installed on a wind power blade of a wind turbine and to deice the wind power blade, and the simulating an actual operation condition and detecting an impeller strength of the impeller comprises: obtaining an actual installation state of the to-be-tested blower, fixing the to-be-tested blower on a rotating test bench in the actual installation state; obtaining actual operation parameters of the wind turbine, determining test parameters of the rotating test bench according to the actual operation parameters, and driving the rotating test bench to rotate at the same centrifugal force with the test parameters; controlling the to-be-tested blower to operate at a preset overspeed rate for a preset time length, and obtaining an overspeed deformation variable of the to-be-tested blower; determining the impeller strength according to the overspeed deformation variable.

2. The de-icing blower reliability test method of claim 1, wherein, the obtaining a static load failure value of the to-be-tested blower according to the initial appearance image and the current appearance image comprises: comparing the current appearance image and the initial appearance image to obtain a current state of the to-be-tested blower; determining the static load failure value of the to-be-tested blower according to the current state of the to-be-tested blower.

3. The de-icing blower reliability test method of claim 2, wherein, the determining the static load failure value of the to-be-tested blower according to the current state of the to-be-tested blower comprises: determining that the to-be-tested blower is in a static load failure state, obtaining a current static load of the tensile testing machine, and taking the current static load as a static load failure value.

4. The de-icing blower reliability test method of claim 1, wherein, The preset vibration parameters are acquired, and the vibration test bench is controlled to perform simulation vibration according to the preset vibration parameters; the to-be-tested air blower is controlled to run at a rated rotating speed in the simulation vibration environment to acquire a maximum amplitude of blade tip vibration of the to-be-tested air blower, and the maximum amplitude of blade tip vibration is taken as a blade strength value; The vibration test bench is controlled to vibrate the to-be-tested air blower along X, Y and Z axes at a preset acceleration in a preset vibration frequency range; The maximum axial displacement of blade tip and the maximum circumferential displacement of blade tip of the to-be-tested air blower in a preset vibration period are acquired and taken as the maximum amplitude of blade tip vibration.

5. The de-icing blower reliability test method of claim 4, wherein, The to-be-tested air blower is provided with a blade tip timing sensor and a key phase sensor in a volute, and the maximum axial displacement of blade tip and the maximum circumferential displacement of blade tip of the to-be-tested air blower in a preset vibration period include: The blade tip axial amplitude variation line and the blade tip circumferential amplitude variation line of the to-be-tested air blower are detected through the blade tip timing sensor and the key phase sensor; The maximum axial displacement of blade tip and the maximum circumferential displacement of blade tip of the to-be-tested air blower in a preset vibration period are determined according to the blade tip axial amplitude variation line and the blade tip circumferential amplitude variation line.

6. The de-icing blower reliability test method of claim 1, wherein, The to-be-tested air blower is controlled to run at a preset overspeed rate for a preset time length, and an overspeed deformation variable of the to-be-tested air blower is acquired, and the overspeed deformation variable of the to-be-tested air blower includes: An initial appearance image of the to-be-tested air blower before testing is acquired; The to-be-tested air blower is controlled to run at a preset overspeed rate for a preset time length, and an overspeed appearance image of the to-be-tested air blower is acquired; An overspeed deformation variable of the to-be-tested air blower is acquired according to the initial appearance image and the overspeed appearance image.

7. A de-icing blower reliability testing system, characterized by, The deicing air blower reliability test system includes: A tension machine for detecting a connecting strength value of a blade and an impeller; A vibration test bench for detecting a blade strength value of the blade; A rotating test bench for detecting an impeller strength of the impeller; A controller, the tension machine, the vibration test bench and the rotating test bench are electrically connected with the controller, and the controller is used to execute the deicing air blower reliability test method in any one of claims 1 to 6.

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