Non-contact state monitoring device for hub-main shaft connecting bolt of wind turbine generator

Abstract

The utility model discloses a non-contact state monitoring device for hub-spindle connecting bolts of a wind turbine generator, which relates to the technical field of wind driven generators and comprises a plurality of connecting bolts, a plurality of groups of electrified coils and a group of induction coils. The plurality of groups of electrified coils are respectively arranged at the hub ends of the plurality of connecting bolts, and the induction coil is arranged on the main shaft base; the plurality of groups of electrified coils are respectively connected with a resistor in series, the plurality of groups of electrified coils are all connected with a low-voltage alternating current power supply in parallel, the induction coil is connected with a voltage measuring instrument, and the voltage measuring instrument is in wireless communication with an upper computer through an acquisition network card; the state of the hub-main shaft connecting bolt can be monitored in real time, meanwhile, the structure of the hub-main shaft connecting bolt is not damaged, and the operation safety of a wind turbine generator is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to wind driven generator technical field especially is connected bolt state monitoring device of non -contact wind turbine hub - main shaft, which relates to a kind of non -contact wind turbine hub - main shaft connected bolt state monitoring device. BACKGROUND

[0002] Wind driven generator is a kind of large machinery that can convert wind energy into mechanical energy, ultimately drive generator to work, and hub-main shaft connecting bolt is an important component for wind turbine blade to drive generator main shaft to run, which is subjected to huge torque and shear stress brought by wind turbine blade, so that the blade root is more prone to fatigue damage, in order to maintain the safety and stability of wind turbine operation, monitoring the state of wind turbine hub-main shaft connecting bolt becomes an important safety means.

[0003] In the prior art, in order to avoid the risk of bolt fatigue damage, the monitoring means is a combination of artificial regular inspection and contact sensor detection, and the contact sensor and the like need to change the structure of hub-main shaft connecting bolt, which increases the risk of wind turbine operation; in addition, because the hub-main shaft connecting bolt needs to bear irregular alternating stress, the fatigue damage has certain randomness, and the difficulty of artificial regular inspection also increases.

[0004] Therefore, a non-contact wind turbine hub-main shaft connecting bolt state monitoring device is provided to solve the above problems. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a kind of non -contact wind turbine hub - main shaft connected bolt state monitoring device, the strain and fatigue state of wind turbine connecting bolt are monitored in real time under the premise that the structure of hub-main shaft connecting bolt is not destroyed, to reduce the influence of existing contact hub-main shaft connecting bolt state monitoring device on wind turbine operation stability and safety.

[0006] To achieve the above object, the utility model provides a kind of non -contact wind turbine hub - main shaft connected bolt state monitoring device, including multiple connecting bolts, multiple groups of energized coils and a group of induction coils, the number of the connecting bolt and the energized coil is same, multiple groups of the energized coil are respectively arranged in the hub end of multiple connecting bolts, and the induction coil is arranged on main shaft base.

[0007] Preferably, multiple groups of the energized coil are respectively connected in series with resistance, multiple groups of the energized coil are all connected in parallel with low-voltage alternating current power supply, the induction coil is connected with voltage measuring instrument, and the voltage measuring instrument is communicated wirelessly with upper computer through acquisition network card.

[0008] Preferably, the connection between the energized coil and the hub end of the connecting bolt is fixed by adhesion.

[0009] Preferably, the material, cross-sectional parameter and number of turns of the plurality of energized coils are the same, and the resistance values of the different resistors are different.

[0010] Preferably, the output voltage effective value of the low-voltage alternating current power supply is set to 10.6066V, and the measurement accuracy of the voltage measuring instrument is set to be greater than 0.1mV.

[0011] Preferably, the upper computer is provided with an automatic alarm system, the alarm threshold of the automatic alarm system is determined according to the current change amount of the induction coil, and the current change amount of the induction coil is set within the allowable load range of the connecting bolt.

[0012] Therefore, the non-contact wind turbine hub-main shaft connecting bolt state monitoring device has the following beneficial effects:

[0013] (1) The present scheme avoids the damage of the measurement system to the blade root connecting bolt structure through the principle of electromagnetic induction, and the mass of the energized coil is generally small, which also avoids the influence on the operation stability of the blade root connecting bolt, thereby improving the practicability of the device;

[0014] (2) The present scheme can monitor the strain and fatigue state of the wind turbine connecting bolt in real time without damaging the hub-main shaft connecting bolt structure, thereby realizing rapid positioning of the worn bolt and improving the efficiency and accuracy of fault repair;

[0015] (3) The present scheme relies on the principle of electromagnetic induction, and realizes non-contact state monitoring of the hub-main shaft connecting bolt by monitoring the voltage and current values of the induction coil, thereby reducing the influence of the existing contact type hub-main shaft connecting bolt state monitoring device on the operation stability and safety of the wind turbine.

[0016] The technical scheme of the present application will be further described in detail below with reference to the drawings and embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0017] Fig. 1 is a structural diagram of the non-contact wind turbine hub-main shaft connecting bolt state monitoring device of the present application;

[0018] Fig. 2 is a hub end schematic diagram of the non-contact wind turbine hub-main shaft connecting bolt state monitoring device of the present application;

[0019] Fig. 3 is an equivalent circuit schematic diagram of the energized coil of the present application.

[0020] The components include: 1. Connecting bolts; 2. Energizing coil; 3. Induction coil; 4. Low-voltage AC power supply; 5. Spindle base; 6. Voltage measuring instrument; 7. Data acquisition network card; 8. Host computer. Detailed Implementation

[0021] The technical solution of this utility model will be further described below with reference to the accompanying drawings and embodiments.

[0022] Unless otherwise defined, the technical or scientific terms used in this utility model shall have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "first," "second," and similar terms used in this utility model do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship will also change accordingly.

[0023] Example

[0024] like Figs. 1-3 As shown, this utility model provides a non-contact wind turbine hub-main shaft connection bolt status monitoring device, including multiple connection bolts 1, multiple sets of energized coils 2 and a set of induction coils 3;

[0025] The number of connecting bolts 1 and the number of energized coils 2 are the same. Multiple energized coils 2 are respectively set at the hub end of multiple connecting bolts 1. The connection method between the energized coils 2 and the hub end of the connecting bolts 1 is set as adhesive fixation.

[0026] Multiple sets of energized coils 2 are connected in series with resistors, and all sets of energized coils 2 are connected in parallel with low-voltage AC power supply 4. The materials, cross-sectional parameters and number of coil turns of the multiple sets of energized coils 2 are the same, and the resistance values ​​of the different resistors are different. When the spindle rotates, the induction coil 3 enters the magnetic field of the energized coil 2 and generates an induced current. The different resistance values ​​of the resistors ensure that the current in each set of energized coils 2 is different, thus making the magnitude of the induced voltage different, so as to locate the damaged connecting bolt 1.

[0027] The induction coil 3 is set on the spindle base 5. The induction coil 3 is connected to the voltage measuring instrument 6. The voltage measuring instrument 6 communicates wirelessly with the host computer 8 through the acquisition network card 7. The voltage measuring instrument 6 inputs the current measurement result to the acquisition network card 7, and the acquisition network card 7 synchronizes the current measurement result to the host computer 8.

[0028] The output voltage effective value of the low-voltage alternating current power supply 4 is set to 10.6066V, and the measurement accuracy of the voltage measuring instrument 6 is set to be greater than 0.1mV.

[0029] The automatic alarm system is arranged in the host computer 8, and the alarm threshold of the automatic alarm system is determined according to the current variation of the induction coil 3; the current variation of the induction coil 3 is arranged in the permissible load range of the connecting bolt 1; when the measured current variation of the induction coil 3 exceeds the threshold, the alarm system issues a fault alarm.

[0030] The monitoring principle of the connecting bolt state monitoring device in the embodiment is as follows: the low-voltage alternating current power supply 4 supplies power, the energized coil 2 generates an electromagnetic field, and an induced current is generated in the induction coil 3 on the main shaft base 5; because the induced current is related to the state of the metal object in the two coils, i.e., the state of the connecting bolt 1, when the connecting bolt 1 appears fatigue damage such as tooth breakage, the induced current will change, thereby realizing the state monitoring of the connecting bolt 1.

[0031] Therefore, the non-contact type wind turbine hub-main shaft connecting bolt state monitoring device with the above structure is adopted in the utility model, relies on the electromagnetic induction principle, and realizes the non-contact type state monitoring of the hub-main shaft connecting bolt by monitoring the voltage and current value of the induction coil.

[0032] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the utility model and not to limit them, although the utility model has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that: the technical solutions of the utility model can still be modified or replaced by the same, and these modifications or equivalent replacements cannot make the modified technical solutions deviate from the spirit and scope of the technical solutions of the utility model.

Claims

1. A non-contact wind turbine hub-spindle connection bolt condition monitoring device, characterized in that, The connecting bolt is same in number with the energized coil, and a plurality of the energized coils are arranged at the hub end of the connecting bolt.

2. A non-contact wind turbine hub-shaft connecting bolt condition monitoring device according to claim 1, characterized in that, A plurality of the energized coils are connected in series with the resistor, and a plurality of the energized coils are connected in parallel with the low-voltage AC power supply.

3. A non-contact wind turbine hub-shaft connecting bolt condition monitoring device according to claim 1, characterized in that, The connecting mode between the energized coil and the hub end of the connecting bolt is set as adhesive fixing.

4. A non-contact wind turbine hub-shaft connecting bolt condition monitoring device according to claim 2, characterized in that, The material, cross-sectional parameter and coil turns of a plurality of the energized coils are same, and the resistance of different resistors is different.

5. A non-contact wind turbine hub-shaft connecting bolt condition monitoring device according to claim 2, characterized in that, The output voltage effective value of the low-voltage AC power supply is set as 10.6066V, and the measurement accuracy of the voltage measuring instrument is set as greater than 0.1mV.

6. A non-contact wind turbine hub-shaft connecting bolt condition monitoring device according to claim 2, characterized in that, The upper computer is provided with an automatic alarm system, the alarm threshold of the automatic alarm system is determined according to the current variation of the inductive coil, and the current variation of the inductive coil is set in the allowable load range of the connecting bolt.

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