Displacement sensor and blade root load monitoring system

Abstract

The utility model discloses a displacement sensor and a blade root load monitoring system, and relates to the technical field of wind turbine blade root micro-displacement measurement. The displacement sensor comprises an iron core support, a protection tube, an iron core support rod, a columnar iron core, a coil tube and a coil tube support, an iron core supporting rod and a protection tube are arranged on the iron core support and are coaxial; one end of the iron core support rod is connected with the iron core support, and the other end is connected with a columnar iron core; the coil pipe support is connected with a coil pipe, the inner diameter of the coil pipe is matched with the outer diameter of the columnar iron core, and the columnar iron core extends into the coil pipe; the protection tube and the coil tube are coaxial, and the inner diameter of the protection tube is matched with the outer diameter of the coil tube; and adhesive layers are arranged on the lower surfaces of the iron core support and the coil tube support. The problem that the micro-displacement of the blade root of the wind turbine cannot be reliably measured at low cost in the prior art is solved, the micro-displacement of the blade root of the wind turbine can be rapidly and accurately measured, and the measurement cost is reduced.

Description

Displacement sensor and blade root load monitoring system Technical Field

[0001] This application relates to the field of wind turbine blade root micro-displacement measurement technology, and in particular to a displacement sensor and blade root load monitoring system. Background Technology

[0002] For measuring the micro-displacement of wind turbine blade roots, resistance strain gauges or fiber optic strain gauges are generally used. However, these two methods have high installation requirements and are expensive, making them unsuitable for large-scale applications. LVDT (Linear Variable Differential Transformer) displacement sensors are characterized by high precision and high sensitivity, converting the displacement of the iron core in the coil tube into a voltage signal for displacement measurement. However, the structure of existing LVDT displacement sensors is not suitable for measuring the micro-displacement of wind turbine blade roots.

[0003] Therefore, a displacement sensor suitable for measuring the micro-displacement of wind turbine blade roots is needed. Summary of the Invention

[0004] This application provides a displacement sensor and blade root load monitoring system, which solves the problem in the prior art that the micro-displacement of wind turbine blade roots cannot be reliably and cost-effectively measured. It can quickly and accurately measure the micro-displacement of wind turbine blade roots and reduce measurement costs.

[0005] In a first aspect, embodiments of this application provide a displacement sensor, including:

[0006] Iron core support, protective tube, iron core support rod, columnar iron core, coil tube, coil tube support.

[0007] The iron core support is equipped with an iron core support rod and a protective tube, with the iron core support rod and the protective tube being coaxial. One end of the iron core support rod is connected to the iron core support, and the other end is connected to a columnar iron core. A coil tube is connected to the coil tube support, with the inner diameter of the coil tube matching the outer diameter of the columnar iron core, and the columnar iron core extending into the coil tube. The protective tube and the coil tube are coaxial, with the inner diameter of the protective tube matching the outer diameter of the coil tube. An adhesive layer is provided on the lower surface of both the iron core support and the coil tube support.

[0008] Furthermore, the displacement sensor also includes:

[0009] The mounting plate has limit holes at both ends. The iron core support has a first screw hole, and the coil drum support has a second screw hole. The mounting plate and the iron core support are connected by bolts that pass through the limit holes and extend into the first screw holes. The mounting plate and the coil drum support are also connected by bolts that pass through the limit holes and extend into the second screw holes.

[0010] Furthermore, the coil tube support and the coil tube are detachably clamped together, and the coil tube support has a clamping groove in which the coil tube is placed.

[0011] Furthermore, a temperature sensor is also installed inside the coil tube.

[0012] Furthermore, the iron core support and coil tube support are made of polyoxymethylene resin.

[0013] Furthermore, the adhesive layer is a polyurethane structural adhesive.

[0014] Secondly, embodiments of this application provide a leaf root load monitoring system, comprising:

[0015] Multiple displacement sensors, such as those in the first aspect, are connected to an industrial computer, and the multiple displacement sensors are electrically connected to the industrial computer.

[0016] The displacement sensor is used to acquire micro-displacement data of the blade root of the wind turbine blade; the industrial control computer is used to obtain the load corresponding to the position of the blade root of the wind turbine blade at the displacement sensor based on the micro-displacement data, so as to monitor the blade root load.

[0017] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

[0018] This embodiment of the application sets the iron core support rod on the iron core support glued to the root of the wind turbine blade, and sets the coil tube on the coil tube support glued to the root of the wind turbine blade. This allows the measurement of the micro-displacement between the iron core support and the coil tube support at the root of the wind turbine blade to be converted into the measurement of the displacement of the cylindrical iron core in the coil tube. This enables rapid and accurate measurement of the micro-displacement at the root of the wind turbine blade, reducing measurement costs. By setting a mounting plate connected to the iron core support and the coil tube support, the position of the cylindrical iron core in the coil tube can be adjusted without adjusting it during displacement sensor installation, facilitating installation and improving installation efficiency. By clamping and detachably connecting the coil tube support to the coil tube, the position of the cylindrical iron core in the coil tube can be easily adjusted after the displacement sensor is installed. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments of this application or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 is an exploded view of the structure of the displacement sensor provided in the embodiment of this application;

[0021] Figure 2 is a schematic diagram of the overall structure of the displacement sensor provided in the embodiment of this application;

[0022] Figure 3 is a schematic diagram of the overall structure of the displacement sensor provided in the embodiment of this application from another perspective.

[0023] Explanation of reference numerals in the attached drawings: 101-Core support; 102-Protective tube; 103-Core support rod; 104-Columnar core; 105-Coil tube; 106-Coil tube support; 107-Mounting plate; 108-Limiting hole; 109-First screw hole; 110-Second screw hole; 111-Adhesive layer. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some, not all, of the embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model.

[0025] In the description of the embodiments of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing the embodiments of this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In addition, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this utility model can be understood according to the specific circumstances.

[0026] For measuring the micro-displacement of wind turbine blade roots, resistance strain gauges or fiber optic strain gauges are generally used. However, these two methods have high requirements for installation technology and are expensive, making them unsuitable for large-scale applications. LVDT (Linear Variable Differential Transformer) displacement sensors are characterized by high precision and high sensitivity, converting the displacement of the iron core into an electrical signal to measure the displacement. However, the structure of existing LVDT displacement sensors is not suitable for measuring the micro-displacement of wind turbine blade roots.

[0027] Therefore, a displacement sensor suitable for measuring the micro-displacement of wind turbine blade roots is needed.

[0028] Against this background, this disclosure provides a displacement sensor that can quickly and accurately measure the micro-displacement of the wind turbine blade root, reducing measurement costs.

[0029] The displacement sensor will now be described by way of example with reference to the accompanying drawings.

[0030] Figure 1 is an exploded view of the displacement sensor provided in the embodiment of this application, Figure 2 is an overall structural diagram of the displacement sensor provided in the embodiment of this application, and Figure 3 is an overall structural diagram of the displacement sensor provided in the embodiment of this application from another perspective.

[0031] As shown in Figures 1 to 3, the displacement sensor may include:

[0032] Iron core support 101, protective tube 102, iron core support rod 103, columnar iron core 104, coil tube 105, coil tube support 106.

[0033] The iron core support 101 is provided with an iron core support rod 103 and a protective tube 102, and the iron core support rod 103 and the protective tube 102 are coaxial.

[0034] For example, the core support 101 may have a screw hole, and the core support rod 103 near the core support 101 may have a thread (shown in black on the core support rod 103 in Figure 1). The core support rod 103 and the core support 101 are detachably connected by the thread.

[0035] One end of the iron core support rod 103 is connected to the iron core support 101, and the other end is connected to the columnar iron core 104.

[0036] Specifically, a threaded hole may be provided in the central axis of the columnar iron core 104, and a thread may be provided at one end of the iron core support rod 103 near the columnar iron core 104 (shown in black in Figure 1). The iron core support rod 103 and the columnar iron core 104 are detachably connected by the thread.

[0037] A coil tube 105 is connected to the coil tube support 106. The inner diameter of the coil tube 105 matches the outer diameter of the columnar iron core 104, and the columnar iron core 104 extends into the coil tube 105.

[0038] It is understandable that the inner diameter of the coil tube 105 should be slightly larger than the outer diameter of the columnar iron core 104, so that the columnar iron core 104 can move axially within the coil tube 105.

[0039] When the cylindrical iron core 104 is in the predetermined position in the coil tube 105, the coil in the coil tube 105 will not generate voltage; when the cylindrical iron core 104 moves axially in the coil tube 105, the coil in the coil tube 105 will generate voltage. The coil tube 105 may also be equipped with a circuit capable of calculation, which can determine the displacement of the cylindrical iron core 104 based on the pre-obtained relationship between voltage and displacement. The coil tube 105 may also transmit the obtained displacement of the cylindrical iron core 104 to other modules / units via a cable.

[0040] In some possible embodiments, a temperature sensor is also provided in the coil tube 105 to monitor the temperature.

[0041] For example, the core support 101 and the coil tube support 106 may be made of polyoxymethylene resin.

[0042] The protective tube 102 and the coil tube 105 are coaxial, and the inner diameter of the protective tube 102 matches the outer diameter of the coil tube 105.

[0043] For example, the inner diameter of the protective tube 102 should be slightly larger than the outer diameter of the coil tube 105, so that the end of the coil tube 105 away from the coil support can extend into the protective tube 102.

[0044] Both the iron core support 101 and the coil tube support 106 have an adhesive layer 111 on their lower surfaces.

[0045] Specifically, adhesive layer 111 is a polyurethane structural adhesive.

[0046] In use, the iron core support 101 and the coil support are glued and fixed to the desired position at the root of the wind turbine blade using the adhesive layer 111. At the same time, the columnar iron core 104 is inserted into the coil tube 105 and positioned in the predetermined position. Before gluing, the columnar iron core 104 can be positioned in the predetermined position by adjusting the distance between the iron core support 101 and the coil support, or the length of the iron core support rod 103 inserted into the iron core support 101 can be adjusted by rotating the iron core support rod 103 to position the columnar iron core 104 in the predetermined position.

[0047] In this embodiment, by setting the iron core support rod 103 on the iron core support 101 glued to the root of the wind turbine blade, and setting the coil tube 105 on the coil tube support 106 glued to the root of the wind turbine blade, the measurement of the micro-displacement between the iron core support 101 and the coil tube support 106 at the root of the wind turbine blade can be converted into the measurement of the displacement of the columnar iron core 104 in the coil tube 105, thereby achieving rapid and accurate measurement of the micro-displacement at the root of the wind turbine blade and reducing measurement costs.

[0048] Furthermore, the displacement sensor also includes:

[0049] Mounting plate 107 has limit holes 108 at both ends. The iron core support 101 has a first screw hole 109 and the coil drum support has a second screw hole 110. Mounting plate 107 and iron core support 101 are connected by bolts that pass through the limit holes 108 and extend into the first screw holes 109. Mounting plate 107 and coil drum support are connected by bolts that pass through the limit holes 108 and extend into the second screw holes 110.

[0050] For example, the distance between the two limiting holes 108 at both ends of the mounting plate 107 can be preset to a distance that allows the columnar iron core 104 to be in a predetermined position in the coil tube 105, thereby eliminating the need to adjust the position of the columnar iron core 104 in the coil tube 105, facilitating installation and improving installation efficiency.

[0051] When in use, the displacement sensor can be installed at the expected position at the root of the wind turbine blade by holding the mounting plate 107. After the displacement sensor is pasted and fixed, the mounting plate 107 can be removed from the displacement sensor.

[0052] Furthermore, the coil tube support 106 and the coil tube 105 are clamped and detachably connected. The coil tube support 106 has a clamping groove, and the coil tube 105 is placed in the clamping groove.

[0053] For example, after placing the coil tube 105 in the clamping groove, the size of the clamping groove can be adjusted (by means of the bolts on the coil tube 105 as shown in Figure 1) to clamp the groove, thereby fixing the coil tube 105 in the coil tube support 106. Furthermore, after attaching and fixing the displacement sensor to the intended position at the root of the wind turbine blade, if the columnar iron core 104 is not found to be in the predetermined position within the coil tube 105, the size of the clamping groove can be adjusted to loosen the coil tube 105, conveniently adjusting its position so that the columnar iron core 104 is in the predetermined position within the coil tube 105. Then, the size of the clamping groove can be adjusted again so that the coil tube support 106 clamps and fixes the coil tube 105.

[0054] This disclosure also provides a blade root load monitoring system, which includes:

[0055] Multiple displacement sensors as disclosed in the foregoing embodiments, and an industrial control computer.

[0056] Multiple displacement sensors are connected to industrial control computers.

[0057] The displacement sensor is used to acquire micro-displacement data of the blade root of the wind turbine blade; the industrial control computer is used to obtain the load corresponding to the position of the blade root of the wind turbine blade at the displacement sensor based on the micro-displacement data, so as to monitor the blade root load.

[0058] This embodiment uses the aforementioned displacement sensor to quickly and accurately acquire micro-displacement data of the wind turbine blade root, thereby obtaining the load corresponding to the micro-displacement and achieving accurate monitoring of the blade root load.

[0059] The various embodiments in this specification are described in a progressive manner. For the same or similar parts between the various embodiments, please refer to each other. Each embodiment focuses on describing the differences from other embodiments.

[0060] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of this application.

Claims

1. A displacement sensor, characterized in that, include: The system comprises a core support (101), a protective tube (102), a core support rod (103), a columnar core (104), a coil tube (105), and a coil tube support (106). The core support (101) is provided with the core support rod (103) and the protective tube (102), the core support rod (103) and the protective tube (102) being coaxial. One end of the core support rod (103) is connected to the core support (101), and the other end is connected to the columnar core (104). The coil tube support... The coil tube (105) is connected to the base (106), the inner diameter of the coil tube (105) matches the outer diameter of the columnar iron core (104), and the columnar iron core (104) extends into the coil tube (105); the protective tube (102) is coaxial with the coil tube (105), and the inner diameter of the protective tube (102) matches the outer diameter of the coil tube (105); the lower surfaces of the iron core support (101) and the coil tube support (106) are both provided with an adhesive layer (111).

2. The displacement sensor according to claim 1, characterized in that, Also includes: The mounting plate (107) has limit holes (108) at both ends. The iron core support (101) has a first screw hole (109) and the coil tube support has a second screw hole (110). The mounting plate (107) and the iron core support (101) are connected by bolts that pass through the limit holes (108) and extend into the first screw hole (109). The mounting plate (107) and the coil tube support are connected by bolts that pass through the limit holes (108) and extend into the second screw hole (110).

3. The displacement sensor according to claim 1, characterized in that, The coil tube support (106) is detachably clamped to the coil tube (105). The coil tube support (106) has a clamping groove, and the coil tube (105) is placed in the clamping groove.

4. The displacement sensor according to claim 1, characterized in that, A temperature sensor is also provided in the coil tube (105).

5. The displacement sensor according to claim 1, characterized in that, The iron core support (101) and the coil tube support (106) are made of polyoxymethylene resin.

6. The displacement sensor according to claim 1, characterized in that, The adhesive layer (111) is a polyurethane structural adhesive.

7. A leaf root load monitoring system, characterized in that, include: The system includes multiple displacement sensors as described in any one of claims 1-6, an industrial control computer, and multiple displacement sensors electrically connected to the industrial control computer; the displacement sensors are used to acquire micro-displacement data of the blade root of the wind turbine blade; the industrial control computer is used to obtain the load corresponding to the position of the blade root of the wind turbine blade at the displacement sensor based on the micro-displacement data, so as to monitor the blade root load.

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