Touch switch and wind turbine using the touch switch

Abstract

The present invention provides a wind turbine, which includes a housing, a hub, an alarm circuit with a touch switch, and a main shaft rotatably assembled on the housing and having an axis extending in the front-rear direction; a hub connection screw with an axis extending in the front-rear direction is penetrated through the hub and the main shaft; a front stop block is arranged at the front end of the hub connection screw, and a rear stop block is arranged at the rear end; the touch switch is used to change the switch state of the touch switch when the front stop block and / or the rear stop block moves along the front-rear direction of the axis of the hub connection screw; the alarm circuit alarms due to the change of the switch state of the touch switch. In the present invention, during the process of pulling the front magnetic block and the rear magnetic block apart, precise detection of nut loosening can be carried out or used as a loosening warning through resistance change. The operator can know that the hub connection screw is loose according to the detection, and then maintain the wind turbine to prevent more serious problems from occurring subsequently.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical equipment, and particularly to a touch switch and a wind turbine using the touch switch. Background Art

[0002] Existing wind turbines, such as the touch switch and the wind turbine using the touch switch disclosed in the Chinese Patent Authorization Publication No. CN104948394B, the wind turbine includes a housing, a hub, a main shaft, and a hub connection screw. A stop block is provided at the rear end of the hub connection screw. The wind turbine further includes an alarm circuit with a touch switch, etc. This solution provides a wind turbine that can monitor the hub connection screw when the hub connection screw withdraws from the screw installation hole, and the touch switch used in the wind turbine.

[0003] The above solution relies on the hub connection screw moving backward, and then the stop nut will push the movable part of the touch switch. Under the pushing action of the middle nut, the movable part is separated from the fixed part, so that the circuit loop where the touch switch is located is disconnected. After the PLC detects this disconnection signal, it performs remote alarm through the SCADA system, and timely notifies the background operation and maintenance personnel for processing, so as to prevent other devices from being damaged and achieve the purpose of monitoring the loosening of the screw. However, there are deficiencies: since it is the hub connection screw moving backward, there is a certain gap between the stop nut and the movable part. Therefore, the loosening of the screw cannot be detected before the stop nut contacts the movable part. When the hub connection screw moves forward, the stop nut and the movable part move away from each other, so the movable part cannot be pushed, and thus the touch switch cannot detect the loosening of the screw. Summary of the Invention

[0004] The purpose of the present invention is to provide a touch switch and a wind turbine using the touch switch, so as to solve the problems proposed in the above background art.

[0005] To achieve the above purpose, the present invention provides the following technical solutions:

[0006] A wind turbine includes a housing, a hub, an alarm circuit with a touch switch, and a main shaft rotatably assembled on the housing and having an axis extending in the front-rear direction;

[0007] A hub connection screw with an axis extending in the front-rear direction is inserted through the hub and the main shaft;

[0008] A front stop block is provided at the front end of the hub connection screw, and a rear stop block is provided at the rear end;

[0009] The touch switch is used to change the switch state of the touch switch when the front stop block and / or the rear stop block move along the front-rear direction of the axis of the hub connection screw;

[0010] The alarm circuit alarms when the switch state of the touch switch changes due to contact.

[0011] Preferably, the touch switch includes a front connecting rod, a rear connecting rod, a front magnetic block, and a rear magnetic block. The front magnetic block and the rear magnetic block are located in the cavity of the hub connecting screw, and their inner end faces are adsorbed and attached together. One end of the front connecting rod penetrates into the cavity of the hub connecting screw and is connected to the front magnetic block. The other end of the front connecting rod is equipped with a front linkage block that abuts and cooperates with the front stop block. One end of the rear connecting rod penetrates into the cavity of the hub connecting screw and is connected to the rear magnetic block. The other end of the rear connecting rod is equipped with a rear linkage block that abuts and cooperates with the rear stop block. When the front stop block pushes the front linkage block and / or the rear stop block pushes the rear linkage block, the front magnetic block and the rear magnetic block are separated, which is used to detect the loosening of the hub connecting screw.

[0012] Preferably, screw holes are provided on the outer end faces of the front magnetic block and the rear magnetic block, and one ends of the front connecting rod and the rear connecting rod are respectively inserted into the screw holes.

[0013] Preferably, the inner end face of the front magnetic block has a contact socket, the inner end face of the rear magnetic block has a contact that is adaptively inserted into the contact socket, and wires connected to the contact socket and the contact are arranged inside the front magnetic block and the rear magnetic block. The ends of the wires extend out and are connected to a junction box provided on the main shaft.

[0014] Preferably, the inner wall of the contact socket has a resistance layer.

[0015] Preferably, the alarm circuit includes a PLC connected to the touch switch and a SCADA system connected to the PLC, which are arranged in the nacelle cabinet of the wind turbine.

[0016] To achieve the above object, the present invention also provides the following technical solutions:

[0017] A touch switch, which is used to change the switch state of the touch switch when the front stop block and / or the rear stop block move in the front-rear direction along the axis of the hub connecting screw;

[0018] The alarm circuit alarms when the switch state of the touch switch changes;

[0019] The touch switch includes a front connecting rod, a rear connecting rod, a front magnetic block, and a rear magnetic block. The front magnetic block and the rear magnetic block are located in the cavity of the hub connecting screw, and their inner end faces are adsorbed and attached together. One end of the front connecting rod penetrates into the cavity of the hub connecting screw and is connected to the front magnetic block. The other end of the front connecting rod is equipped with a front linkage block that abuts and cooperates with the front stop block. One end of the rear connecting rod penetrates into the cavity of the hub connecting screw and is connected to the rear magnetic block. The other end of the rear connecting rod is equipped with a rear linkage block that abuts and cooperates with the rear stop block. When the front stop block pushes the front linkage block and / or the rear stop block pushes the rear linkage block, the front magnetic block and the rear magnetic block are separated, which is used to detect the loosening of the hub connecting screw.

[0020] Compared with the prior art, the beneficial effects of the present invention are:

[0021] In the present invention, when the front stop block or the rear stop block becomes loose, or the length of the hub connecting screw is stretched due to stress, as the hub rotates, it will push the front linkage block or the rear linkage block. Under the pushing action, the front connecting rod or the rear connecting rod generates its own pulling force, so that the attracted front magnetic block and the rear magnetic block are pulled apart and separated. This causes the circuit loop of the touch switch to be disconnected. After the PLC detects this disconnection signal, it performs remote alarm through the SCADA system, promptly informing the background operation and maintenance personnel to handle it, thereby preventing other devices from being damaged and achieving the purpose of monitoring the loosening of the hub connecting screw during the forward and backward movement in the axial direction.

[0022] In the present invention, by setting a resistance layer, during the process of the front magnetic block and the rear magnetic block being pulled apart, the loosening of the nut can be accurately detected or used as a loosening warning through the change in resistance. The operator can know that the hub connecting screw is loose based on the detection and then maintain the wind turbine to prevent more serious problems from occurring later. Description of the Drawings

[0023] Figure 1 It is a schematic diagram of the cooperation of the main shaft, hub, housing, and touch switch in the wind turbine of the present invention;

[0024] Figure 2 It is a schematic diagram of the structure of the touch switch of the present invention and its installation with the hub connecting screw;

[0025] Figure 3 It is a schematic diagram of the structure and cooperation of the front magnetic block and the rear magnetic block of the present invention;

[0026] Figure 4 It is a schematic diagram of the circuit control principle of the alarm circuit of the present invention.

[0027] In the figure: 1 housing, 2 main shaft, 3 hub connecting screw, 4 hub, 5 junction box, 6 resistance layer, 7 front stop, 8 rear stop, 9 front connecting rod, 10 rear connecting rod, 11 front linkage block, 12 rear linkage block, 13 front magnetic block, 14 rear magnetic block, 15 screw hole, 16 contact socket, 17 contact, 18 wire. Specific implementation mode

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the 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 those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0029] Please refer to Figures 1 to 4 , the present invention provides a technical solution:

[0030] A wind turbine, comprising a housing 1, a hub 4, an alarm circuit with a touch switch, and a main shaft 2 rotatably assembled on the housing 1 and having an axis extending in the front-rear direction;

[0031] A hub connecting screw 3 with an axis extending in the front-rear direction is penetrated through the hub 4 and the main shaft 2;

[0032] A front stop 7 is arranged at the front end of the hub connecting screw 3, and a rear stop 8 is arranged at the rear end;

[0033] When the hub connecting screw 3 moves along the front-rear direction of the axis, the touch switch changes the switch state of the touch switch through the front stop 7 and / or the rear stop 8;

[0034] The alarm circuit alarms due to the change of the switch state of the touch switch.

[0035] Specifically, the touch switch includes a front connecting rod 9, a rear connecting rod 10, a front magnetic block 13 and a rear magnetic block 14. The front magnetic block 13 and the rear magnetic block 14 are located in the cavity of the hub connecting screw 3, and their inner end faces are adsorbed and attached to each other. One end of the front connecting rod 9 penetrates into the cavity of the hub connecting screw 3 and is connected to the front magnetic block 13. The other end of the front connecting rod 9 is equipped with a front linkage block 11 that abuts and cooperates with the front stop block 7. One end of the rear connecting rod 10 penetrates into the cavity of the hub connecting screw 3 and is connected to the rear magnetic block 14. The other end of the rear connecting rod 10 is equipped with a rear linkage block 12 that abuts and cooperates with the rear stop block 8. When the front stop block 7 pushes the front linkage block 11 and / or the rear stop block 8 pushes the rear linkage block 12, the front magnetic block 13 and the rear magnetic block 14 are separated, which is used to detect the loosening of the hub connecting screw 3. Screw holes 15 are provided on the outer end faces of the front magnetic block 13 and the rear magnetic block 14, and one ends of the front connecting rod 9 and the rear connecting rod 10 are respectively inserted into the screw holes 15. The inner end face of the front magnetic block 13 has a contact socket 16, and the inner end face of the rear magnetic block 14 has a contact 17 that is adaptively inserted into the contact socket 16. A wire 18 connected to the contact socket 16 and the contact 17 is arranged inside the front magnetic block 13 and the rear magnetic block 14, and the end of the wire 18 passes through and is connected to a junction box 5 provided on the main shaft 2. The alarm circuit includes a PLC connected to the touch switch in the nacelle cabinet of the wind turbine and a SCADA system connected to the PLC.

[0036] As Figure 1 shown, as Figure 2 and Figure 3 shown, the mounting hub 4 is fixed by being mounted to the main shaft 2 through the hub connecting screw 3. The axis of the hub connecting screw 3 is provided with mounting blocks at the front and rear ends, namely a front stop block 7 and a rear stop block 8, and the stop blocks can be nuts. The front stop block 7 and the rear stop block 8 constitute the stop blocks that limit the forward and backward movement of the hub connecting screw 3.

[0037] In the present invention, after the hub connecting screw 3 is installed, it is in a tightened state, and the touch switch is used to detect whether the hub connecting screw 3 is loosened or detached. Specifically, two mutually attractive front magnetic block 13 and rear magnetic block 14 are installed in the cavity of the hub connecting screw 3. One ends of the front connecting rod 9 and the rear connecting rod 10 respectively penetrate through the front stop block 7 and the rear stop block 8 and extend into the cavity of the hub connecting screw 3, and then are screwed to the screw holes 15 on the outer end faces of the front magnetic block 13 and the rear magnetic block 14. In the tightened state, the inner end faces of the front magnetic block 13 and the rear magnetic block 14 are adsorbed and attached to each other. At this time, the contact 17 is inserted into the contact socket 16. Both the contact 17 and the contact socket 16 are conductors, such as made of copper material. Therefore, through the connecting wire 18, the end of the wire 18 passes outside the hub connecting screw 3 and is then connected to the junction box 5, and then connected to the PCL and the junction box 5. Figure 1The arrow direction indicates the rotation direction of the hub 4.

[0038] During the operation of the wind turbine, due to various reasons, the hub connection screw 3 may become loose from front to back or from back to front. When the hub connection screw 3 moves forward or backward, the front stop block 7 or the rear stop block 8 on the hub connection screw 3 will push the front linkage block 11 or the rear linkage block 12. Under the pushing action, the front connecting rod 9 or the rear connecting rod 10 will generate its own tensile force, so that the attracted front magnetic block 13 and the rear magnetic block 14 are pulled apart and separated. In this way, the circuit loop where the touch switch is located is disconnected. After the PLC detects this disconnection signal, it will send a remote alarm through the SCADA system to promptly inform the back-end operation and maintenance personnel to handle it, so as to prevent other devices from being damaged and achieve the purpose of monitoring the loosening of the screw; the combined use of the front stop block 7 and the rear stop block 8 can reduce the loosening probability of the hub connection screw 3.

[0039] It should be noted that the loosening of the hub connection screw 3 is not necessarily only "becoming loose from front to back". The loosening can be "from front to back" or "from back to front". As Figure 2 shown, when the loosening is "from front to back", it means that the front stop block 7 is loose. When the loosening is "from back to front", it means that the rear stop block 8 is loose. In this way, the stop block can push the linkage block, so that the magnetic block is pulled apart, realizing the disconnection of the circuit loop where the touch switch is located and generating a disconnection signal. After the PLC detects this disconnection signal, it will send a remote alarm through the SCADA system.

[0040] Another situation is that the hub connection screw 3 is stretched and elongated due to stress, resulting in the disconnection of the circuit loop and generating a disconnection signal. Although there is no relative movement between the front stop block 7 and the rear stop block 8 and the hub connection screw 3 in this case, since the length of the hub connection screw 3 itself becomes longer, the front magnetic block 13 and the rear magnetic block 14 are pulled apart, and this can also realize the disconnection of the circuit loop where the touch switch is located and generate a disconnection signal.

[0041] As Figure 3As shown, the inner wall of the contact socket 16 has a resistance layer 6. As mentioned above, during the process of separating the front magnetic block 13 and the rear magnetic block 14, the loosening of the nut can be accurately detected or used as a loosening warning through the change in resistance. Specifically, after the contact 17 and the contact socket 16 are fully plugged in, the total resistance of the two is R1. Therefore, under the same voltage U, the current is U / R1. If the total resistance of the contact 17 and the contact socket 16 changes to R2 during the separation process, and R2 is greater than R1, then the current is U / R2. Since U / R1 is greater than U / R2, the current will decrease, so a trigger signal for current change will be generated. Then, it is detected by the PLC and transmitted back to the central control room of the wind farm through the SCADA system, so as to carry out loosening warning or directly eliminate loosening according to this, making the detection or loosening warning of the hub connection screw more accurate. The operator can know that the hub connection screw 3 is loose according to the detection, and then maintain the wind turbine to prevent more serious problems from occurring subsequently.

[0042] When the front magnetic block 13 and the rear magnetic block 14 are separated, the loop of the circuit where the touch switch is located is disconnected to generate a disconnection signal. Its equivalent diagram is as Figure 4 shown. The power supply E loop is a closed circuit. Once an open circuit occurs, that is, point A is disconnected, a disconnection signal B is generated, and then it is detected by the PLC and transmitted back to the central control room of the wind farm through the SCADA system. By setting the resistance layer 6, the resistance of the contact socket 16 can be changed, so that the total resistance of the contact socket 16 and the contact 17 can increase gradually when they are separated. For example, if the materials of the contact socket 16 and the contact 17 are copper, and the resistivity of the resistance layer 6 is greater than that of the contact socket 16 and the contact 17, such as selecting an aluminum sheet, then the contact socket 16 has a resistance layer 6. Therefore, when the contact 17 moves outwards relative to the contact socket 16, the resistance between the contact socket 16 and the contact 17 will increase. The connection between the junction box 5 and the PLC is wireless communication. Specifically, there is a single-chip microcomputer in the junction box 5, and then it communicates with the PLC through the wireless transmission module of the single-chip microcomputer. The wireless transmission module such as GRM200G can easily realize the wireless communication between the single-chip microcomputer and the PLC. A pair of modules can be used. One module is connected to the PLC through the RS485 interface, and the other module is connected to the single-chip microcomputer through the RS485. Then, the two modules exchange data through wireless communication, so as to realize the wireless data exchange between Siemens and the single-chip microcomputer. The communication between the single-chip microcomputer and the PLC can also adopt existing technologies such as the wireless remote control system of industrial manipulators based on PLC - Gao Bo, etc., which will not be elaborated here.

[0043] In the present invention, when the front stop block 7 and the rear stop block 8 become loose, or the hub connection screw 3 is stretched in length under stress, as the hub rotates, it will push the front linkage block 11 or the rear linkage block 12. Under the pushing action, the front connecting rod 9 or the rear connecting rod 10 generates its own pulling force, so that the attracted front magnetic block 13 and the rear magnetic block 14 are pulled apart and separated, thus disconnecting the circuit loop where the touch switch is located. After the PLC detects this disconnection signal, it sends a remote alarm through the SCADA system to promptly inform the back-end operation and maintenance personnel for processing, thereby preventing damage to other devices and achieving the purpose of monitoring the loosening of the hub connection screw 3 during the forward and backward movement in the axial direction.

[0044] For the present invention, the parts not described herein can be the same as the prior art, or be well-known technologies, or can be implemented by using the prior art, and will not be elaborated herein.

[0045] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A wind turbine, characterized in that, It includes a housing (1), a hub (4), an alarm circuit with a touch switch, and a main shaft (2) rotatably assembled on the housing (1) and having an axis extending in the front-rear direction; A hub connection screw (3) with an axis extending in the front-rear direction is inserted through the hub (4) and the main shaft (2); A front stop block (7) is provided at the front end of the hub connection screw (3), and a rear stop block (8) is provided at the rear end; When the hub connection screw (3) moves along the front-rear direction, the touch switch changes its switch state through the front stop block (7) or the rear stop block (8); The alarm circuit alarms due to the change in the switch state of the touch switch; The touch switch includes a front connecting rod (9), a rear connecting rod (10), a front magnetic block (13), and a rear magnetic block (14). The front magnetic block (13) and the rear magnetic block (14) are located in the cavity of the hub connection screw (3), and their inner end faces are adsorbed and attached together. One end of the front connecting rod (9) penetrates into the cavity of the hub connection screw (3) and is connected to the front magnetic block (13). A front linkage block (11) that abuts and cooperates with the front stop block (7) is installed at the other end of the front connecting rod (9). One end of the rear connecting rod (10) penetrates into the cavity of the hub connection screw (3) and is connected to the rear magnetic block (14). A rear linkage block (12) that abuts and cooperates with the rear stop block (8) is installed at the other end of the rear connecting rod (10). When the front stop block (7) pushes the front linkage block (11) or the rear stop block (8) pushes the rear linkage block (12), the front magnetic block (13) and the rear magnetic block (14) are separated, for detecting the loosening of the hub connection screw (3).

2. The wind turbine according to claim 1, characterized in that, Screw holes (15) are provided on the outer end faces of the front magnetic block (13) and the rear magnetic block (14), and one ends of the front connecting rod (9) and the rear connecting rod (10) are respectively inserted into the screw holes (15).

3. A wind turbine according to claim 1, wherein, The inner end face of the front magnetic block (13) has a contact socket (16), the inner end face of the rear magnetic block (14) has a contact (17) that is adaptively inserted into the contact socket (16). Wires (18) connected to the contact socket (16) and the contact (17) are arranged inside the front magnetic block (13) and the rear magnetic block (14), and the ends of the wires (18) extend out and are connected to a junction box (5) provided on the main shaft (2).

4. A wind turbine according to claim 3, characterized in that, The inner wall of the contact socket (16) has a resistance layer (6).

5. A wind turbine according to any one of claims 1 to 4, characterized in that, The alarm circuit includes a PLC connected to the touch switch and provided in the nacelle cabinet of the wind turbine and a SCADA system connected to the PLC; 6. A touch switch, characterized in that, When the hub connection screw (3) moves along the front-rear direction, the touch switch changes its switch state through the front stop block (7) or the rear stop block (8); The alarm circuit alarms due to the change in the switch state of the touch switch; The touch switch includes a front connecting rod (9), a rear connecting rod (10), a front magnetic block (13) and a rear magnetic block (14). The front magnetic block (13) and the rear magnetic block (14) are located in the cavity of the hub connection screw (3), and their inner end faces are adsorbed and attached to each other. One end of the front connecting rod (9) penetrates into the cavity of the hub connection screw (3) and is connected to the front magnetic block (13). A front linkage block (11) that abuts against the front stop block (7) is installed at the other end of the front connecting rod (9). One end of the rear connecting rod (10) penetrates into the cavity of the hub connection screw (3) and is connected to the rear magnetic block (14). A rear linkage block (12) that abuts against the rear stop block (8) is installed at the other end of the rear connecting rod (10). When the front stop block (7) pushes the front linkage block (11) or the rear stop block (8) pushes the rear linkage block (12), the front magnetic block (13) is separated from the rear magnetic block (14), which is used to detect the loosening of the hub connection screw (3).

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