Blade safety monitoring method, blade structure and wind driven generator

Abstract

The invention provides a blade safety monitoring method, a blade structure and a wind driven generator. The blade safety monitoring method comprises the steps that the inner side and the outer side of a suction surface beam cap of a blade body are each provided with a first detection piece, and the inner side and the outer side of a pressure surface beam cap of the blade body are each provided with a second detection piece; and acquiring strain states detected by the first detection piece and the second detection piece, and judging the stress state of the suction surface beam cap and / or the pressure surface beam cap according to the strain states. The problem that the safety of the blade cannot be effectively monitored in real time in the prior art is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of blade monitoring, and in particular to a blade safety monitoring method, a blade structure and a wind turbine. Background Art

[0002] The existing solutions cannot detect the yield bending of the blades, so it is impossible to effectively monitor the safety of the blades in real time. Summary of the invention

[0003] The main purpose of the present invention is to provide a blade safety monitoring method, a blade structure and a wind turbine generator, so as to solve the problem in the prior art that the safety of the blades cannot be effectively monitored in real time.

[0004] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, a blade safety monitoring method is provided, comprising: a first detection member is provided on both inner and outer sides of the suction surface beam cap of the blade body, and a second detection member is provided on both inner and outer sides of the pressure surface beam cap of the blade body; the strain state detected by the first detection member and the second detection member is obtained, and the stress state of the suction surface beam cap and / or the pressure surface beam cap is judged according to the strain state.

[0005] Furthermore, the blade safety monitoring method also includes: judging the failure state of the suction surface spar cap based on the comparison between the acquired strain state and the allowable strain of the spar cap material; when comparing the strain state with the predetermined state, when the values ​​detected by the first detection component are all smaller than the allowable strain of the spar cap material, judging that the material of the suction surface spar cap is effective; when at least one of the values ​​detected by the first detection component is smaller than the allowable strain of the spar cap material, judging that the material of the suction surface spar cap has failed.

[0006] Furthermore, the blade safety monitoring method also includes: judging the failure state of the pressure surface beam cap based on the comparison between the acquired strain state and the allowable strain of the beam cap material; judging that the material of the pressure surface beam cap is effective when the values ​​detected by the second detection component are all smaller than the allowable strain of the beam cap material; judging that the material of the pressure surface beam cap has failed when at least one of the values ​​detected by the second detection component is all smaller than the allowable strain of the beam cap material.

[0007] Furthermore, the blade safety monitoring method also includes: judging the buckling state of the suction surface beam cap according to the change of the acquired strain state; when the value of the first detection piece on the outer side of the suction surface beam cap begins to decrease and the value of the first detection piece on the inner side of the suction surface beam cap begins to increase, it is determined that the material of the suction surface beam cap is buckled.

[0008] Furthermore, the blade safety monitoring method also includes: judging the buckling state of the pressure surface beam cap according to the change of the acquired strain state; when the value of the second detection piece on the outside of the pressure surface beam cap begins to decrease and the value of the second detection piece on the inside of the pressure surface beam cap begins to increase, it is determined that the material of the pressure surface beam cap is buckled.

[0009] According to another aspect of the present invention, a blade structure is provided, comprising: a blade body, the blade body comprising a suction surface beam cap and a pressure surface beam cap; a plurality of first detection members, the first detection members are arranged on both inner and outer side surfaces of the suction surface beam cap; a plurality of second detection members, the second detection members are arranged on both inner and outer side surfaces of the pressure surface beam cap.

[0010] Furthermore, the first detection member and / or the second detection member includes: an optical fiber sensor, which is pre-buried in the suction surface beam cap or the pressure surface beam cap and extends along the length direction of the blade body; and a strain grating, which is etched on the surface of the optical fiber sensor.

[0011] Further, the first detection member on the inner side and / or the outer side of the suction surface beam cap extends along the length direction of the suction surface beam cap.

[0012] Further, the second detection member on the inner side and / or the outer side of the pressure surface beam cap extends along the length direction of the pressure surface beam cap.

[0013] According to another aspect of the present invention, a wind turbine is provided, comprising the above-mentioned blade structure.

[0014] By applying the technical solution of the present invention, by utilizing the first detection member and the second detection member provided on the suction surface beam cap and the pressure surface beam cap, since both the suction surface beam cap and the pressure surface beam cap are provided with detection members inside and outside, a total of at least four detection members are provided, and the first detection member and the second detection member are used to detect strain on the inner and outer sides of the suction surface beam cap and the inner and outer sides of the pressure surface beam cap, so that the states of the suction surface beam cap and the pressure surface beam cap are determined according to the detection results, thereby achieving the effect of real-time and effective monitoring of the safety of the blade. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0016] Figure 1 A flow chart showing the blade safety monitoring method of the present invention is shown;

[0017] Figure 2 A schematic structural diagram of the blade structure of the present invention is shown;

[0018] Figure 3Shows Figure 2 Cross-sectional view of .

[0019] The above drawings include the following reference numerals:

[0020] 10. Blade body; 11. Suction surface beam cap; 12. Pressure surface beam cap; 20. First detection part; 30. Second detection part. DETAILED DESCRIPTION

[0021] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0022] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0023] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.

[0024] In order to solve the problem that the existing technology cannot effectively monitor the safety of blades in real time, the present invention provides a blade safety monitoring method, a blade structure and a wind turbine.

[0025] like Figures 1 to 3 A blade safety monitoring method is shown, comprising: a first detection member 20 is provided on both inner and outer sides of a suction surface beam cap 11 of a blade body 10, and a second detection member 30 is provided on both inner and outer sides of a pressure surface beam cap 12 of the blade body 10; the strain state detected by the first detection member 20 and the second detection member 30 is obtained, and the stress state of the suction surface beam cap 11 and / or the pressure surface beam cap 12 is judged according to the strain state.

[0026] This embodiment utilizes the first detection member 20 and the second detection member 30 provided on the suction surface beam cap 11 and the pressure surface beam cap 12. Since the suction surface beam cap 11 and the pressure surface beam cap 12 are provided with detection members inside and outside, a total of at least four detection members are provided. The first detection member 20 and the second detection member 30 are used to detect strain on the inner and outer sides of the suction surface beam cap 11 and the inner and outer sides of the pressure surface beam cap 12, so that the states of the suction surface beam cap 11 and the pressure surface beam cap 12 are determined according to the detection results, thereby achieving the effect of real-time and effective monitoring of the safety of the blade.

[0027] The stress state of this embodiment includes two states: a failure state due to excessive stress and a yield state due to stress still within the usable range. Of course, the stress state may also include other states according to actual needs.

[0028] It should be noted that the suction side is the side of the blade structure facing the airflow, that is, the windward side of the blade structure, and the pressure side is the side of the blade structure away from the airflow, that is, the leeward side of the blade structure.

[0029] In this embodiment, the blade safety monitoring method also includes: judging the failure state of the suction surface spar cap 11 according to the comparison between the acquired strain state and the allowable strain of the spar cap material; when comparing the strain state with the predetermined state, when the values ​​detected by the first detection member 20 are all smaller than the allowable strain of the spar cap material, judging that the material of the suction surface spar cap 11 is effective; when at least one of the values ​​detected by the first detection member 20 is smaller than the allowable strain of the spar cap material, judging that the material of the suction surface spar cap 11 is failed.

[0030] Similarly, the blade safety monitoring method also includes: judging the failure state of the pressure surface spar cap 12 based on the comparison between the acquired strain state and the allowable strain of the spar cap material; judging that the material of the pressure surface spar cap 12 is effective when the values ​​detected by the second detection component 30 are all smaller than the allowable strain of the spar cap material; judging that the material of the pressure surface spar cap 12 is failed when at least one of the values ​​detected by the second detection component 30 is all smaller than the allowable strain of the spar cap material.

[0031] Through the comparison and judgment of the above aspects, it can be obtained whether the suction surface beam cap 11 and the pressure surface beam cap 12 fail. If failure occurs, relevant personnel are promptly prompted to handle it through alarms or other means, thereby ensuring the safety of use and achieving the effect of safe real-time monitoring.

[0032] In this embodiment, the blade safety monitoring method also includes: judging the buckling state of the suction surface beam cap 11 according to the change of the acquired strain state; when the value of the first detection component 20 on the outside of the suction surface beam cap 11 begins to decrease and the value of the first detection component 20 on the inside of the suction surface beam cap 11 begins to increase, it is determined that the material of the suction surface beam cap 11 is buckled.

[0033] Similarly, the blade safety monitoring method also includes: judging the buckling state of the pressure surface beam cap 12 according to the change of the acquired strain state; when the value of the second detection component 30 on the outside of the pressure surface beam cap 12 begins to decrease and the value of the second detection component 30 on the inside of the pressure surface beam cap 12 begins to increase, it is determined that the material of the pressure surface beam cap 12 is buckled.

[0034] Through the above-mentioned judgment, it can be determined whether the suction surface beam cap 11 and the pressure surface beam cap 12 have yielded. If yielding occurs, relevant personnel are promptly prompted to pay attention and handle it through alarms or other means, thereby ensuring the safety of use and achieving the effect of real-time safety monitoring.

[0035] It should be noted that the monitoring of the above-mentioned failure state and yield state are not independent of each other, and the two can be performed simultaneously and associated together. For example, when the values ​​detected by the first detection member 20 are all less than the allowable strain of the beam cap material, and the value of the first detection member 20 on the outside of the suction surface beam cap 11 begins to decrease, and the value of the first detection member 20 on the inside of the suction surface beam cap 11 begins to increase, it is determined that the material of the suction surface beam cap 11 is effective but yielding has occurred, and other combinations are similar. The simultaneous monitoring of the two aspects can further improve the comprehensiveness and reliability of the monitoring, thereby further improving safety.

[0036] like Figure 2 and Figure 3 As shown, the present embodiment also provides a blade structure, which can be used to perform the above-mentioned blade safety monitoring method. The blade structure includes a blade body 10, a plurality of first detection members 20 and a plurality of second detection members 30. The blade body 10 includes a suction surface beam cap 11 and a pressure surface beam cap 12. The first detection members 20 are provided on both the inner and outer surfaces of the suction surface beam cap 11. The second detection members 30 are provided on both the inner and outer surfaces of the pressure surface beam cap 12. By providing the first detection member 20 and the second detection member 30, the inner and outer sides of the suction surface beam cap 11 and the pressure surface beam cap 12 are monitored in real time, and the above-mentioned blade safety monitoring method is used to achieve the effect of real-time and effective monitoring of the safety of the blade.

[0037] The first detection member 20 on the inner and / or outer sides of the suction surface beam cap 11 of this embodiment extends along the length direction of the suction surface beam cap 11, and the second detection member 30 on the inner and / or outer sides of the pressure surface beam cap 12 extends along the length direction of the pressure surface beam cap 12. Due to the above-mentioned extension along the length direction, the first detection member 20 and the second detection member 30 in the above-mentioned blade safety monitoring method can monitor a single cross section, so that the stress state obtained is the stress state at the cross section position. At this time, multiple cross sections can be monitored along the length direction, thereby realizing the monitoring of the entire blade structure.

[0038] In the present embodiment, the structural forms of the first detection member 20 and the second detection member 30 are basically the same. Taking the first detection member 20 as an example, the first detection member 20 includes an optical fiber sensor and a strain grating. The optical fiber sensor is pre-buried in the suction surface beam cap 11 or the pressure surface beam cap 12, and the optical fiber sensor extends along the length direction of the blade body 10; the strain grating is etched on the surface of the optical fiber sensor, and the position of the strain grating distance etching can be adjusted accordingly as needed to meet the monitoring requirements. The above-mentioned structural form can realize the status monitoring of a specific position, and the overall structure is simple, and the detection results are accurate and reliable. Of course, the first detection member 20 and the second detection member 30 can also adopt different structural forms, and the structural forms of the first detection member 20 and the second detection member 30 are not limited to the above-mentioned structural forms in the present embodiment, and they can be adjusted as needed.

[0039] This embodiment also provides a wind turbine generator, comprising the above blade structure. Through the design of the above blade structure, the state of the wind turbine generator can be monitored in real time, thereby ensuring safety during operation.

[0040] It should be noted that, the multiple in the above embodiments refers to at least two.

[0041] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0042] 1. It solves the problem that the existing technology cannot effectively monitor the safety of blades in real time;

[0043] 2. The status of the suction side beam cap and the pressure side beam cap can be determined based on the test results, thereby achieving the effect of real-time and effective monitoring of the blade safety;

[0044] 3. Realize monitoring of both failure state and yield state to further improve the comprehensiveness and reliability of monitoring, thereby further improving safety.

[0045] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0046] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0047] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0048] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A blade safety monitoring method, characterized in that: include: A first detection member (20) is provided on both inner and outer sides of a suction surface spar cap (11) of a blade body (10), and a second detection member (30) is provided on both inner and outer sides of a pressure surface spar cap (12) of the blade body (10); The strain states detected by the first detection member (20) and the second detection member (30) are obtained, and the stress states of the suction surface beam cap (11) and / or the pressure surface beam cap (12) are determined based on the strain states.

2. The blade safety monitoring method according to claim 1, characterized in that: The blade safety monitoring method further comprises: According to the comparison between the obtained strain state and the allowable strain of the spar cap material, the failure state of the suction surface spar cap (11) is judged; When the strain state is compared with a predetermined state, when the values ​​detected by the first detection member (20) are all smaller than the allowable strain of the beam cap material, it is determined that the material of the suction surface beam cap (11) is effective; When at least one of the values ​​detected by the first detection member (20) is less than the allowable strain of the spar cap material, it is determined that the material of the suction surface spar cap (11) has failed.

3. The blade safety monitoring method according to claim 1, characterized in that: The blade safety monitoring method further comprises: Determining the failure state of the pressure surface beam cap (12) based on a comparison between the acquired strain state and the allowable strain of the beam cap material; When the values ​​detected by the second detection member (30) are all smaller than the allowable strain of the beam cap material, it is determined that the material of the pressure surface beam cap (12) is effective; When at least one of the values ​​detected by the second detection member (30) is less than the allowable strain of the beam cap material, it is determined that the material of the pressure surface beam cap (12) has failed.

4. The blade safety monitoring method according to claim 1, characterized in that: The blade safety monitoring method further comprises: determining the buckling state of the suction surface beam cap (11) according to the acquired change in the strain state; When the value of the first detection piece (20) outside the suction surface beam cap (11) starts to decrease and the value of the first detection piece (20) inside the suction surface beam cap (11) starts to increase, it is determined that the material of the suction surface beam cap (11) is buckled.

5. The blade safety monitoring method according to claim 1, characterized in that: The blade safety monitoring method further comprises: determining the buckling state of the pressure surface beam cap (12) according to the acquired change in the strain state; When the value of the second detection piece (30) outside the pressure surface beam cap (12) starts to decrease and the value of the second detection piece (30) inside the pressure surface beam cap (12) starts to increase, it is determined that the material of the pressure surface beam cap (12) is buckled.

6. A blade structure, characterized in that: include: A blade body (10), wherein the blade body (10) comprises a suction surface beam cap (11) and a pressure surface beam cap (12); A plurality of first detection members (20), wherein the first detection members (20) are arranged on both inner and outer side surfaces of the suction surface beam cap (11); A plurality of second detection components (30), wherein the second detection components (30) are arranged on both inner and outer side surfaces of the pressure surface beam cap (12).

7. The blade structure according to claim 6, characterized in that: The first detection member (20) and / or the second detection member (30) comprises: An optical fiber sensor, wherein the optical fiber sensor is pre-buried in the suction surface beam cap (11) or the pressure surface beam cap (12), and the optical fiber sensor extends along the length direction of the blade body (10); A strain grating is etched on the surface of the optical fiber sensor.

8. The blade structure according to claim 6, characterized in that: The first detection member (20) on the inner side and / or the outer side of the suction surface beam cap (11) extends along the length direction of the suction surface beam cap (11).

9. The blade structure according to claim 6, characterized in that: The second detection member (30) on the inner side and / or the outer side of the pressure surface beam cap (12) extends along the length direction of the pressure surface beam cap (12).

10. A wind turbine generator, characterized in that: The blade structure comprises the blade structure according to any one of claims 6 to 9.

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