Device for detecting fan blade

Abstract

A device for detecting fan blades comprises a detection generator, a short message module, a rectification circuit, a comparison circuit, a photoelectric switch, a first detection circuit and a second detection circuit. The detection generator and the photoelectric switch are respectively arranged on a shell of the wind driven generator; the short message module, the rectification circuit, the comparison circuit, the first detection circuit and the second detection circuit are installed in the element box and are electrically connected. In the application of the utility model, the photoelectric switch, the first detection circuit and the second detection circuit are controlled to be electrified only when the wind power on site is sufficient to drive the blades of the wind driven generator to rotate and then the wind driven generator generates power, otherwise, the photoelectric switch, the first detection circuit and the second detection circuit are not controlled to be electrified, thereby preventing the situation that no wind power exists on site and a follow-up short message module alarms mistakenly; when one or more blades of the generator fall off, or the rotating shaft of the wind driven generator is stuck, and after the first or second detection circuit detects that the blades fall off, remote related personnel can be prompted to timely go to the site for maintenance through short messages, so that safe and stable operation of the wind driven generator is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of wind power generator auxiliary equipment, in particular to a device for detecting fan blades. Background Art

[0002] A wind turbine is an electric device that converts wind energy into mechanical work, which drives the rotor to rotate and finally outputs alternating current. The general structure of a wind turbine includes a wind wheel (blades), a generator, a tower, etc. Wind turbines have been widely used because of their energy-saving and environmental protection.

[0003] Although wind turbines have many advantages, they are usually installed in remote areas without human supervision. In actual operation, there is a chance that the wind turbine blades will fall off or the shaft will get stuck. Since the relevant staff cannot timely understand the specific situation and carry out targeted maintenance (the existing technology requires relevant personnel to conduct regular or irregular on-site inspections), it will have an adverse impact on the normal operation of the wind turbine. In view of the above factors, it is particularly necessary to provide a device that can automatically detect the condition of wind turbine blades and promptly notify relevant personnel by SMS when the blades and the generator shaft disc are separated or the shaft is stuck. Utility Model Content

[0004] In order to overcome the drawbacks of the existing wind turbines as described in the background technology due to the lack of a suitable blade performance detection device, the utility model provides a device for detecting wind turbine blades, which can automatically detect whether the blades of the wind turbine are falling off or the shaft is stuck under the joint action of relevant mechanisms, when there is wind power on site and the wind turbine can generate electricity. When a blade falls off from the generator shaft or the shaft is stuck, a text message can be pushed to the mobile phone of the remote manager, and the relevant personnel can go to the site for maintenance as soon as possible, thereby ensuring the stable and reliable operation of the wind turbine.

[0005] The technical solution adopted by the utility model to solve its technical problems is:

[0006] A device for detecting wind turbine blades, comprising a detection generator and a text message module, characterized in that it also has a rectifier circuit, a comparison circuit, a photoelectric switch, a first detection circuit and a second detection circuit; the detection generator is installed at the upper end of the shell of the wind turbine generator, and there are two sets of photoelectric switches, which are respectively installed on the shell of the wind turbine generator at the front end of the detection generator; the text message module, the rectifier circuit, the comparison circuit, the first detection circuit and the second detection circuit are installed in a component box; the power output end of the detection generator is electrically connected to the power input end of the rectifier circuit, and the signal output end of the rectifier circuit is electrically connected to the signal input end of the comparison circuit; the control power output end of the comparison circuit is electrically connected to the power input ends of the first detection circuit, the second detection circuit and the photoelectric switch, the signal power output ends of the first detection circuit and the second detection circuit are electrically connected to the power input end of the text message module, and the signal output ends of the two sets of photoelectric switches are electrically connected to the signal input ends of the first detection circuit and the second detection circuit, respectively.

[0007] Furthermore, the blades of the detection generator and the blades of the wind generator are located in the same plane front and back, and the detection head of the photoelectric switch is located at the front side and its height is higher than the blade disk height of the wind generator.

[0008] Furthermore, the rectifier circuit includes a bridge stack and a capacitor that are electrically connected, and the power output end of the bridge stack and two electrodes of the capacitor are connected respectively.

[0009] Furthermore, the comparison circuit includes an electrically connected adjustable resistor, a resistor, a transistor and a relay, one end of the adjustable resistor is connected to one end of the first resistor and one end of the second resistor, the other end of the second resistor is connected to the base of the transistor, the collector of the transistor is connected to the negative power input end of the relay, the other end of the first resistor is connected to the emitter of the transistor, and the positive power input end of the relay is connected to the control power input end.

[0010] Furthermore, the first detection circuit and the second detection circuit have the same structure, and both include an adjustable resistor, a resistor, a capacitor, a transistor and a relay that are electrically connected, one end of the adjustable resistor is connected to one end of the resistor and the positive electrode of the capacitor, the other end of the resistor is connected to the base of the transistor, the collector of the transistor is connected to the negative power input terminal of the relay, the negative electrode of the capacitor is connected to the emitter of the transistor, and the positive power input terminal of the relay is connected to the control power input terminal.

[0011] Furthermore, the normally open contact terminals of the relays of the first detection circuit and the second detection circuit are electrically connected to the positive power input terminal of the SMS module, and the negative power input terminal of the SMS module and one of the signal input terminals are connected.

[0012] Compared with the prior art, the present invention has the following beneficial effects: (1) In the application of the present invention, the small detection generator cooperates with the rectifier circuit and the comparison circuit. When there is sufficient wind force on site to drive the blades of the wind turbine generator to rotate and generate electricity, the photoelectric switch and the first detection circuit and the second detection circuit are controlled to be energized. Otherwise, they are not controlled to be energized. In this way, it is prevented that there is no wind on site and the subsequent SMS module falsely alarms; (2) In actual detection, when one or more blades of the generator fall off or the shaft of the wind turbine generator is stuck (the bearings are locked, etc.), the first detection circuit and the second detection circuit can detect it and promptly remind the remote relevant personnel to go to the site for repair in time through SMS, thereby ensuring the safe and stable operation of the wind turbine. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0014] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0015] Figure 2 This is a circuit diagram of the utility model. DETAILED DESCRIPTION

[0016] Figure 1 , 2 As shown in the figure, a device for detecting wind turbine blades includes a small detection generator M (12V small AC wind turbine), a text message module A4, a power module A1, a battery G1, and also has a rectifier circuit 1, a comparison circuit 2, photoelectric switches A3 and A5, a first detection circuit 3 and a second detection circuit 4; the lower end of the base of the small detection generator M is bolted to the middle of the front upper end of the shell of the large wind turbine 5, and the photoelectric switches A3 and A5 are longitudinally distributed and bolted to the front upper end of the shell of the wind turbine 5 at the front side end of the small detection generator; the text message module A4, the rectifier circuit 1, the comparison circuit 2, the first detection circuit 3 and the second detection circuit 4, the power module A4, and the battery G1 (12V / 10Ah) are installed on the circuit board in the component box 6.

[0017] Figure 1 , 2As shown in , the detection generator M is a small wind turbine, and the blades of the detection generator M and the blades of the wind turbine are in the same plane front and back. The detection heads of the photoelectric switches A3 and A5 are located at the front side end and are higher than the blade disc height of the wind turbine 5. The rectifier circuit includes a bridge stack A2 and a capacitor C1 connected via circuit board wiring, and the power output terminals 3 and 4 of the bridge stack A2 are connected to the two poles of the capacitor C1 respectively. The comparison circuit includes an adjustable resistor RP1, resistors R1 and R2, a transistor Q1 and a relay K1 connected via circuit board wiring, one end of the adjustable resistor RP1 is connected to one end of the first resistor R1 and one end of the second resistor R2, the other end of the second resistor R2 is connected to the base of the transistor Q1, the collector of the transistor Q1 is connected to the negative power input terminal of the relay K1, the other end of the first resistor R1 is connected to the emitter of the transistor Q1, and the positive pole of the relay K1 is connected to the control power input terminal. The first detection circuit includes an adjustable resistor R3, a resistor R4, a capacitor C2, a transistor Q2 and a relay K2 connected via circuit board wiring, one end of the adjustable resistor R3 is connected to one end of the resistor R4 and the positive electrode of the capacitor C2, the other end of the resistor R4 is connected to the base of the transistor Q2, the collector of the transistor Q2 is connected to the negative power input terminal of the relay K2, the negative electrode of the capacitor C2 is connected to the emitter of the transistor Q2, and the positive power input terminal of the relay K2 is connected to the control power input terminal. The second detection circuit includes an adjustable resistor R5, a resistor R6, a capacitor C3, a transistor Q3 and a relay K3 connected via circuit board wiring, one end of the adjustable resistor R5 is connected to one end of the resistor R6 and the positive electrode of the capacitor C3, the other end of the resistor R6 is connected to the base of the transistor Q3, the collector of the transistor Q3 is connected to the negative power input terminal of the relay K3, the negative electrode of the capacitor C3 is connected to the emitter of the transistor Q3, and the positive power input terminal of the relay K3 is connected to the control power input terminal. The normally open contact end of the relay K2 of the first detection circuit and the normally open contact end of the relay K3 of the second detection circuit are connected to the positive power input terminal 1 of the SMS module A4 through a wire, and the negative power input terminal 2 of the SMS module A4 and one of the signal input terminals 3 are connected to the negative electrode of the capacitor C1.

[0018] Figure 1 , 2As shown in the figure, the power input terminals 1 and 2 of the power module A1 are connected to the power output terminal of the wind turbine via wires. The power output terminals 3 and 4 of the power module A1 are connected to the two poles of the battery G1, the control power input terminal of the relay K1 of the comparison circuit, and the emitter of the transistor Q1 via wires. The power output terminal of the detection generator M and the power input terminal of the rectifier bridge stack A2 of the rectifier circuit are connected to the 1 and 2 pins via wires. The positive and negative poles of the capacitor C1 at the signal output terminal of the rectifier circuit and the other end of the adjustable resistor RP1 at the signal input terminal of the comparison circuit and the emitter of the transistor Q1 are connected via wires. The control power output terminal relay K1 of the comparison circuit, the normally open contact terminal and the emitter of the transistor Q1, the power input terminal relay K2 of the first detection circuit, the positive power input terminal and the emitter of the transistor Q2, the power input terminal relay K3 of the second detection circuit, and the power input terminals 1 and 2 of the photoelectric switches A3 and A5 are connected via wires. The signal output ends of the photoelectric switches A3 and A5 and the other end of the adjustable resistor R3 at the signal input end of the first detection circuit and the other end of the adjustable resistor R5 at the signal input end of the second detection circuit are connected via wires respectively.

[0019] Figure 1 , 2 As shown in , after the power module A1 is powered, the 3rd and 4th pins output a stable 12V DC power supply, which enters the two poles of the battery G1 (the battery G1 is usually floatingly charged to ensure that the relevant circuits can be powered and work when the wind turbine itself fails and does not output power) and the power input end of the comparison circuit. In actual situations, when the wind force on site is relatively small (not enough to drive the wind turbine 5 to generate electricity), the power supply from the detection generator M is rectified by the bridge stack A2 and filtered by the capacitor C1, and then divided by the adjustable resistor RP1 and the resistor R1. The resistor R2 reduces the voltage and limits the current and enters the base of the transistor Q1 below 0.7V. The transistor Q1 will not be turned on, the relay K1 will not be powered on, and the first and second detection circuits, the SMS module, and the photoelectric switch of the subsequent stage will not be powered on and work, which prevents the insufficient wind force on site and the failure of the blades of the wind turbine 5 to rotate, causing the SMS module A4 to send SMS messages by mistake. When the wind force on site is strong (can drive the wind turbine 5 to generate electricity), the power generated by the detection generator M is rectified by the bridge stack A1, filtered by the capacitor C1, and then divided by the adjustable resistor RP1 and the resistor R1. The resistor R2 reduces the voltage and limits the current to enter the base of the transistor Q1 to be higher than 0.7V. The transistor Q1 will turn on the collector to output a low level and enter the negative power input terminal of the relay K1. The relay K1 is energized to attract its control power input terminal and the normally open contact terminal to close. In this way, the first and second detection circuits, the SMS module, the photoelectric switches A3 and A5 of the subsequent stage will be energized to work, and automatically detect whether the blades of the wind turbine 5 have fallen off or whether the shaft of the generator is stuck.

[0020] Figure 1 , 2As shown, after the first detection circuit and the photoelectric switch A3 are powered on and working, when there is no obstacle in the detection head of the photoelectric switch A3 (that is, the corresponding blade of the wind turbine has not rotated to the front of the detection head of the photoelectric switch A3), the 3rd pin of the photoelectric switch A3 outputs a high level, which is reduced by the adjustable resistor R3 and limited by current to charge the capacitor C2. When there is an obstacle in the detection head of the photoelectric switch A3 (that is, the corresponding blade of the wind turbine has rotated to the front of the detection head of the photoelectric switch A3), the 3rd pin of the photoelectric switch A3 does not output a high level, which is reduced by the adjustable resistor R and limited by current to charge the capacitor C2. In actual situations, when the wind turbine generates electricity under corresponding wind conditions, its multiple blades 51 do not fall off, and the time interval between every two adjacent blades 51 passing through the photoelectric switch A3 is not less than a certain time (for example, not less than 8 seconds). Since the power output time of pin 3 of the photoelectric switch A3 is relatively short each time, the 12V power supply is reduced and limited by the adjustable resistor R3 to charge the capacitor C2 for a relatively short time (less than 8 seconds, the time is equal to 1.1*the resistance value of the adjustable resistor RP1*the capacity of the capacitor C2). The 12V power supply enters the base of the transistor Q2 below 0.7V through the adjustable resistor R3 and the resistor R4, and the transistor Q2 will not be turned on, so the SMS module A4 will not send the first SMS (before two adjacent blades pass through the detection head of the photoelectric switch A3, the pin 3 of the photoelectric switch A3 stops outputting a high level). When the wind turbine generates electricity under corresponding wind conditions, one or more of its blades 51 falls off, and one of every two adjacent blades 51 of the multiple blades 51 falls off (including the generator shaft being stuck and no blade being located at the front side end of the photoelectric switch), the distance between the two adjacent blades at the position after the blades fall off is widened, and the time interval passing through the photoelectric switch A3 is greater than a certain time (for example, greater than 8 seconds). Since the power output time of the 3rd foot of the photoelectric switch A3 is relatively long, the 12V power supply is reduced and limited by the adjustable resistor R3 for a relatively long charging time of the capacitor C2 (greater than 8 seconds). The 12V power supply enters the base of the transistor Q2 with a voltage higher than 0.7V through the adjustable resistor R3 and the resistor R4. The transistor Q2 will turn on the collector to output a high level and enter the negative power input terminal of the relay K2. The relay K2 is energized to attract its control power input terminal and the normally open contact terminal to close, and then the SMS module A4 is energized to send out the first SMS stored inside.

[0021] Figure 1 , 2As shown, after the second detection circuit and the photoelectric switch A5 are powered on, when there is no obstacle in front of the detection head of the photoelectric switch A5, its pin 3 does not output a high level, that is, when the wind turbine generates electricity under the corresponding wind conditions and its multiple blades 51 rotate normally, the time interval between every two adjacent blades 51 of the multiple blades 51 passing through the photoelectric switch A5 is less than a certain time (for example, less than 8 seconds). Since the power output time of the pin 3 of the photoelectric switch A5 is relatively short each time, the 12V power supply is reduced and limited by the adjustable resistor R3 to charge the capacitor C2 for a relatively short time (less than 8 seconds). The 12V power supply enters the base of the transistor Q3 below 0.7V through the adjustable resistor R5 and the resistor R6. The transistor Q3 will not be turned on, and then the SMS module A4 will not send the first SMS (before the two adjacent blades pass through the detection head of the photoelectric switch A3, the pin 3 of the photoelectric switch A5 stops outputting a high level). When the shaft of the wind turbine is stuck and a corresponding blade is blocked in front of the detection head of the photoelectric switch A5, the 3rd pin of the photoelectric switch A5 outputs a high level for more than 8 seconds. Since the power output time of the 3rd pin of the photoelectric switch A3 is relatively long, the 12V power supply is reduced and limited by the adjustable resistor R3 for a relatively long charging time (more than 8 seconds) of the capacitor C3. The 12V power supply enters the base of the transistor Q3 with a voltage higher than 0.7V through the adjustable resistor R5 and the resistor R6. The transistor Q3 will turn on the collector to output a high level and enter the negative power input terminal of the relay K3. The relay K3 is energized to close its control power input terminal and the normally open contact terminal, and then the SMS module A4 is energized to send the first SMS stored internally. Through the above, in the application of the utility model, when there is wind force on site that is sufficient to drive the blades of the wind turbine 5 to rotate and then the wind turbine generates electricity, the photoelectric switch and the first detection circuit and the second detection circuit are controlled to be energized, otherwise they are not controlled to be energized, thus preventing the absence of wind force on site and the subsequent SMS module from falsely alarming; when one or more blades of the generator fall off or the shaft of the wind turbine is stuck (bearings, etc. are locked), the first detection circuit and the second detection circuit can detect it and promptly remind the remote relevant personnel to go to the site for maintenance in time through SMS, thereby ensuring the safe and stable operation of the wind turbine. Figure 2As shown, transistors Q1, Q2, and Q3 are NPN transistors of model 9013; the resistance values ​​of resistors R1, R2, R4, and R6 are 10K, 47K, 10K, and 47K respectively; power module A1 is an AC 220V to DC 24V power module; relays K1, K2, and K3 are DC12V; the resistance value of adjustable resistor RP1 is 470K (adjusted to 80K in this embodiment); capacitors C1, C2, and C3 are electrolytic capacitors of 470μF / 25V, 2μF / 25V, and 2μF / 25V respectively; photoelectric switches A3, A5 is a finished NPN photoelectric switch of model E3F-DS30C4. The photoelectric detection mechanisms A3 and A5 have two power input terminals and one signal output terminal. Depending on the selected model, when there is no obstacle in front of the detection head of the photoelectric detection mechanism A3, the signal output terminal outputs power, otherwise it does not output power. When there is an obstacle in front of the detection head of the photoelectric switch A5, the signal output terminal outputs power, otherwise it does not output power (the outer side of the housing of the photoelectric switch has a distance adjustment knob. Adjusting it to the left will shorten the detection distance, and adjusting it to the right will lengthen the detection distance. The new model can be adjusted to 50 cm respectively). SMS module A4 is a GSM module. The SMS alarm module of 800, the SMS alarm module finished product has two power input terminals 1 and 2, and signal input ports 3-8. After a low-level signal is input to each signal input port, the SMS alarm module finished product will send a text message via the wireless mobile network. The SMS alarm module stores text messages. In this embodiment, a "generator is damaged" text message is stored. After a low-level signal is input to the signal input port 3 of the SMS alarm module, the SMS alarm module can send a text message; the resistance values ​​of the adjustable resistors R3 and R5 are 10M (adjusted to 3.7M in this embodiment; during specific production or use, the technicians or staff adjust the resistance values ​​of the adjustable resistors R3 or R5 to be relatively small and their partial pressure is small. Then, when the 3rd pin of the subsequent photoelectric switch A3 or A5 outputs power for a shorter time each time, the relay K2 or K3 will be electrically attracted, that is, the new The interval time between every two blades not moving or moving to the detection head of the photoelectric switch A3 or A5 becomes shorter; when the resistance value of the adjustable resistor R3 or R5 is adjusted to a relatively large value, the divided voltage is large, and the longer the time interval of the subsequent output power supply of the 3rd foot of the photoelectric switch A3 or A5 is, the relay K2 or K3 will be energized and closed, that is, the interval time between every two blades not moving or moving to the detection head of the photoelectric switch A3 or A5 becomes longer in this new detection method; the specific adjustment technicians should adjust the wind conditions according to the minimum requirements for normal power generation of the wind turbine, and the SMS module should not send SMS when the two blades move to the detection head of the photoelectric switch A3 or A5 respectively; the handles of the adjustable resistors R3 and R5 are located outside the front opening of the component box, and the side ends of the ring handles are marked with text representing different time numbers); the model of the bridge pile A2 is KBP301.

[0022] The above shows and describes the basic principles and main features of the utility model and the advantages of the utility model. For those skilled in the art, it is obvious that the utility model is limited to the details of the above exemplary embodiments, and the utility model can be implemented in other specific forms without departing from the spirit or basic features of the utility model. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the utility model is defined by the attached claims rather than the above description, and it is intended that all changes that fall within the meaning and scope of the equivalent elements of the claims are included in the utility model.

[0023] In addition, it should be understood that although the present specification is described according to the implementation mode, the implementation mode does not only include an independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in the embodiments can also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A device for detecting wind turbine blades, comprising a detection generator and a text message module, characterized in that: It also has a rectifier circuit, a comparison circuit, a photoelectric switch, a first detection circuit and a second detection circuit; the detection generator is installed at the upper end of the shell of the wind turbine generator, and there are two sets of photoelectric switches, which are respectively installed on the shell of the wind turbine generator at the front end of the detection generator; the SMS module, the rectifier circuit, the comparison circuit, the first detection circuit and the second detection circuit are installed in the component box; the power output end of the detection generator is electrically connected to the power input end of the rectifier circuit, and the signal output end of the rectifier circuit is electrically connected to the signal input end of the comparison circuit; the control power output end of the comparison circuit is electrically connected to the power input ends of the first detection circuit, the second detection circuit and the photoelectric switch, the signal power output ends of the first detection circuit and the second detection circuit are electrically connected to the power input end of the SMS module, and the signal output ends of the two sets of photoelectric switches are electrically connected to the signal input ends of the first detection circuit and the second detection circuit, respectively.

2. The device for detecting fan blades according to claim 1, characterized in that: The blades of the detection generator and the blades of the wind generator are in the same plane front and back, and the detection head of the photoelectric switch is located at the front side and its height is higher than the blade disk height of the wind generator.

3. The device for detecting fan blades according to claim 1, characterized in that: The rectifier circuit includes a bridge stack and a capacitor which are electrically connected, and the power output end of the bridge stack is connected to two electrodes of the capacitor respectively.

4. The device for detecting fan blades according to claim 1, characterized in that: The comparison circuit includes an electrically connected adjustable resistor, a resistor, a transistor and a relay, one end of the adjustable resistor is connected to one end of the first resistor and one end of the second resistor, the other end of the second resistor is connected to the base of the transistor, the collector of the transistor is connected to the negative power input end of the relay, the other end of the first resistor is connected to the emitter of the transistor, and the positive power input end of the relay is connected to the control power input end.

5. The device for detecting fan blades according to claim 1, characterized in that: The first detection circuit and the second detection circuit have the same structure, and both include an adjustable resistor, a resistor, a capacitor, a transistor and a relay that are electrically connected. One end of the adjustable resistor is connected to one end of the resistor and the positive electrode of the capacitor, the other end of the resistor is connected to the base of the transistor, the collector of the transistor is connected to the negative power input end of the relay, the negative electrode of the capacitor is connected to the emitter of the transistor, and the positive power input end of the relay is connected to the control power input end.

6. The device for detecting fan blades according to claim 5, characterized in that: The normally open contact terminal of the relay of the first detection circuit and the second detection circuit is electrically connected to the positive power input terminal of the SMS module, and the negative power input terminal of the SMS module is connected to one of the signal input terminals.

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