A method for arranging trigger components of proximity switches and limit switches of a wind turbine generator set

Abstract

The present invention relates to a method for arranging a trigger assembly of a proximity switch and a limit switch of a wind turbine, comprising the following steps: taking the hub rotation center as the center of a circle, setting an angle A1 between a first proximity switch and the zero-degree position of the hub, an angle A2 between the first proximity switch and the second proximity switch, and an angle B2 between the second proximity switch and the limit switch; setting an angle C2 covered by the trigger assembly, an angle C1 of a proximity switch trigger unit on the trigger assembly = B2-(E-A1-A2), where E is the trigger angle of the limit switch; a position where the blade root and the zero-degree position of the blade form an angle D is the installation position of the trigger assembly, and the angle D satisfies the following formula: D = B2-E+A2-C2 / 2+A1. An integrated trigger assembly is arranged according to the relative positions of the proximity switch and the limit switch, the trigger assembly is installed at a certain angle between the blade root and the blade design zero-degree position, and the proximity switch and the limit switch are fixed on the unit hub, so that the position does not need to be changed during batch debugging.

Description

Technical Field

[0001] The invention relates to the technical field of wind power generation equipment, and in particular to a method for arranging trigger components of a proximity switch and a limit switch of a wind turbine set. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] The variable pitch system of a wind turbine is used to adjust the windward angle of the blades according to the wind speed when the wind turbine is running, so as to achieve maximum power tracking or pneumatic braking.

[0004] When the wind turbine is running, the pitch system usually uses a motor encoder to transmit blade position information for closed-loop control, a proximity switch to verify the blade position, and a limit switch as an operation stop signal to ensure that the blades of the wind turbine can change within the set angle adjustment range to obtain maximum power generation and stay within the set feathering shutdown angle range.

[0005] At present, according to the different triggering forms of proximity switches and limit switches, two sets of trigger components need to be installed on the pitch bearing. The rotation of the pitch bearing when the blade rotates drives the movement of the trigger component, so that the proximity switch and limit switch are triggered to realize the verification of the expected position of the blade and shutdown.

[0006] With the mass production of units, the same unit may be equipped with blades of different models for installation and debugging. The design zero-degree positions of blades of different models are not unified, and it is difficult to determine the positions of trigger components on blades of different models. As a result, during the debugging process, it is necessary to frequently change the installation positions of proximity switches and limit switches on the unit according to the different zero-degree positions of the blades, which brings troubles to the actual installation and debugging work. Summary of the invention

[0007] In order to solve the technical problems existing in the above-mentioned background technology, the present invention provides a method for arranging trigger components of proximity switches and limit switches of a wind turbine set, by setting the installation positions of the proximity switch and the limit switch on the belly plate of the unit hub, the relative positions of the two switches maintain a certain angle relationship, and an integrated trigger component is arranged according to the relative positions of the proximity switch and the limit switch, and the trigger component is installed at a certain angle between the root of the blade and the designed zero position of the blade, while the proximity switch and the limit switch are fixed on the unit hub, and there is no need to change the position during batch debugging.

[0008] In order to achieve the above object, the present invention adopts the following technical solution:

[0009] A first aspect of the present invention provides a method for arranging trigger components of a proximity switch and a limit switch of a wind turbine generator set, comprising the following steps:

[0010] Taking the hub rotation center as the center of the circle, set the angle A1 between the first proximity switch and the zero-degree position of the hub, the angle A2 between the first proximity switch and the second proximity switch, and the angle B2 between the second proximity switch and the limit switch;

[0011] Set the angle range C2 covered by the trigger component, the angle C1 of the proximity switch trigger unit on the trigger component = B2-(E-A1-A2), E is the trigger angle of the limit switch;

[0012] The position where the blade root and the blade zero position form an angle D is the installation position of the trigger component, and the angle D satisfies the following formula: D=B2-E+A2-C2 / 2+A1.

[0013] The first proximity switch, the second proximity switch and the limit switch are located at the edge of the hub, and the trigger assembly is located at the root of the blade.

[0014] The trigger assembly comprises a limit switch trigger unit, the proximity switch trigger unit is located on the upper surface of the limit switch trigger unit, the connection unit is located on the lower surface of the limit switch trigger unit, and the connection unit is used to connect with the inner surface edge of the blade root.

[0015] The angle B3 between the center of the trigger component and the proximity switch trigger unit is C1-C2 / 2.

[0016] The deviation between the trigger angle of the limit switch and the trigger angle of the second proximity switch is E-A1-A2.

[0017] The trigger assembly rotates along with the blade, and passes through an initial position, a first trigger position, a second trigger position and a third trigger position in sequence.

[0018] The initial position is the blade zero-degree position;

[0019] The first trigger position is the position where the proximity switch trigger unit approaches the first proximity switch, causing the first proximity switch to be triggered, and the trigger angle is A1;

[0020] The second trigger position is the position where the proximity switch trigger unit approaches the second proximity switch, causing the second proximity switch to be triggered, and the trigger angle is A1+A2;

[0021] The third trigger position is a position where the limit switch trigger unit is close to the limit switch, causing the limit switch to be triggered.

[0022] Compared with the prior art, one or more of the above technical solutions have the following beneficial effects:

[0023] The installation angle of the proximity switch and limit switch installed on the hub relative to the zero point position of the hub is used to set the installation angle of the trigger component relative to the zero point position of the blade. When the zero position of the blade is not uniform, there is no need to change the position of the proximity switch and limit switch on the hub. When using a set of hubs to debug multiple blades of different models, it is ensured that the proximity switch and limit switch are triggered accurately, which is conducive to batch debugging of wind turbines. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0025] Figure 1 is a schematic diagram of the overall structure of a verification device provided by one or more embodiments of the present invention;

[0026] Figure 2 is an isometric view of an installation of a trigger assembly provided by one or more embodiments of the present invention;

[0027] Figure 3 is a schematic diagram of the arrangement of a hub web proximity switch and a limit switch provided by one or more embodiments of the present invention;

[0028] Figure 4 is a schematic diagram of the installation of proximity switches and limit switches provided by one or more embodiments of the present invention;

[0029] Figure 5 is a schematic diagram of the axonometric structure of a trigger assembly provided by one or more embodiments of the present invention;

[0030] Figure 6 is a schematic diagram of a top view of a trigger assembly provided by one or more embodiments of the present invention;

[0031] Figure 7 is a schematic diagram of blade root arrangement provided by one or more embodiments of the present invention;

[0032] Figure 8 is a schematic diagram of the operation of a trigger component provided by one or more embodiments of the present invention;

[0033] Fig. 9 is an enlarged view of a partial view A provided by one or more embodiments of the present invention;

[0034] Fig.10 is an enlarged view of a partial view B provided by one or more embodiments of the present invention;

[0035] Figure 1 Middle: 1. Hub, 2. Limit switch, 3. Proximity switch, 4. Pitch bearing, 5. Trigger assembly, 6. Blade;

[0036] Figure 2-4 Middle: 11, hub zero position, 31, first proximity switch, 32, second proximity switch;

[0037] Figure 5-6 Middle: 51, proximity switch trigger unit, 52, limit switch trigger unit, 53, connection unit;

[0038] Figure 7-10 Middle: 61, blade zero degree position, 530, initial position, 531, first trigger position, 532, second trigger position, 533, third trigger position. DETAILED DESCRIPTION

[0039] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0040] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0041] The variable pitch system of a wind turbine can adjust the windward angle of the blades according to the wind speed when the unit is running, so as to achieve the purpose of maximum power tracking or braking. For example, the blade angle range of a wind turbine is between 0° and 4°, and the feathering parking angle range is between 86° and 90°.

[0042] As described in the background technology, with the mass production of units, the same unit may be adapted to blades of different models. The design zero-degree positions of blades of different models are not uniform, which requires frequent changes in the installation positions of proximity switches and limit switches on the unit according to the different zero-degree positions of the blades during the debugging process, causing troubles in the actual installation and debugging work.

[0043] Therefore, the following embodiment provides a method for arranging the trigger components of the proximity switch and the limit switch of a wind turbine set, by setting the installation positions of the proximity switch and the limit switch on the belly plate of the unit hub, the relative positions of the two switches are maintained in a certain relationship, and an integrated trigger component is set according to the relative positions of the proximity switch and the limit switch, and the trigger component is installed at a certain angle between the root of the blade and the designed zero position of the blade, thereby ensuring the triggering accuracy of the proximity switch and the limit switch, and the proximity switch and the limit switch are fixed on the unit hub, and there is no need to change the position during batch debugging.

[0044] Embodiment 1:

[0045] A method for arranging trigger components of a proximity switch and a limit switch of a wind turbine generator set comprises the following steps:

[0046] Taking the hub rotation center as the center of the circle, obtain the angle A1 between the first proximity switch and the zero-degree position of the hub, the angle A2 between the first proximity switch and the second proximity switch, and the angle B2 between the second proximity switch and the limit switch;

[0047] Get the angle range C2 covered by the trigger component, the angle C1 of the proximity switch trigger unit on the trigger component = B2-(E-A1-A2), E is the trigger angle of the limit switch;

[0048] The position where the blade root and the blade zero position form an angle D is the installation position of the trigger component, and the angle D satisfies the following formula: D=B2-E+A2-C2 / 2+A1.

[0049] Taking the zero-degree position of the wheel hub as the reference, the trigger angle of the first proximity switch is A1, the trigger angle of the second proximity switch is A1+A2, and the trigger angle of the limit switch is E.

[0050] Specific:

[0051] like Figure 1 As shown, one side of the hub 1 is connected to the blade 6 through the pitch bearing 4, a limit switch 2 and a proximity switch 3 are arranged in the hub 1, and a trigger component 5 is arranged in the inner surface of the blade 6.

[0052] This embodiment uses two groups of limit switches 2 and two groups of proximity switches (first proximity switches 31 and second proximity switches 32).

[0053] like Figure 2 As shown, the triggering points of the limit switch 2 and the proximity switch 3 are propped up to a certain height by connecting the bracket to ensure triggering. There is a height difference between the triggering heights of the two. The figure shows that the triggering position of the proximity switch 3 is higher than the triggering position of the limit switch 2.

[0054] like Figure 3 As shown, the installation positions of the limit switch 2 and the proximity switch 3 are respectively set on the wheel hub 1. The angle between the first proximity switch 31 and the zero-degree position 11 of the wheel hub is A1 (which can be adjusted according to the appropriate position of the web inside the wheel hub 1), and the angle between the first proximity switch 31 and the second proximity switch 32 is A2;

[0055] The first proximity switch 31 used in this embodiment is 3° (A1=3°), and the second proximity switch 32 is 86° (A1+A2=83°+3°), so the angle between the first proximity switch 31 and the second proximity switch 32 is 83° (A2=83°); the angle between the center line of the second proximity switch 32 and the limit switch 2 is B1=13.5° (this embodiment uses two groups of limit switches 2, and B1 is the angle between the center lines of the two groups of limit switches 2 relative to the zero-degree position 11 of the wheel hub). This angle affects the structure of the trigger assembly 5 and can be adjusted according to actual conditions. The specific angles given in this embodiment are only for the convenience of explaining the arrangement scheme and can be adjusted according to different needs.

[0056] In this embodiment, the two sets of limit switches 2 are designed as redundant. When the first limit switch is damaged, the second limit switch can still be triggered. The limit switch ensures that the blade rotation angle is limited to a safe range to avoid accidents caused by the blade position rotating beyond the limit position.

[0057] like Figure 4 As shown, after the limit switch 2 is installed, the angle between the limit switch 2 and the second proximity switch 32 is B2=11°, which can be adjusted according to actual needs.

[0058] like Figure 5-6 As shown, the trigger assembly 5 is provided with a proximity switch trigger unit 51 , a limit switch trigger unit 52 and a connecting unit 53 , and the connecting unit 53 is connected to the root of the blade 6 .

[0059] The proximity switch trigger unit 51 and the limit switch trigger unit 52 are trigger elements that cooperate with the proximity switch 3 and the limit switch 2 respectively.

[0060] The trigger angle of the limit switch 2 is determined according to different shutdown strategies, for example, it can be 89°-91°.

[0061] In this embodiment, the limit switch 2 is triggered at E=90°, and the second proximity switch 32 is triggered at 86° (A1+A2). There is a 4° deviation (E-A1-A2) between the limit switch 2 and the second proximity switch 32. At the same time, the actual arrangement angle between the second proximity switch 32 and the closest limit switch 2 is B2=11°. Figure 6 As shown, the included angle of the proximity switch trigger unit 51 on the trigger assembly 5 is C1=7°(B2-4°), that is, C1=B2-(E-A1-A2).

[0062] like Figure 7 As shown, the position at which the blade root and the blade zero position 61 form an angle D is the installation position of the trigger assembly 5. Preferably, a connecting hole is provided on the blade root flange. Figure 6The connecting unit 53 in the figure has a total angle range of C2 = 9° (the total angle range of the trigger component 5 is arbitrarily set. Usually, for installation and use considerations, it is sufficient to be installed in the limit switch trigger component, that is, a certain angle is increased on the basis of C1), the angle between the center of the trigger component 5 and the proximity switch trigger unit 51 is B3 = 2.5° (B3 = C1-C2 / 2), and the trigger angle of the first proximity switch 31 is A1 = 3°, so D = A1 + B3-A1 = 2.5°. After combining the above relationship, it is shown as follows: D = B2-E + A2-C2 / 2 + A1 = 2.5.

[0063] The trigger assembly 5 is installed at the corresponding position of the blade root, and its working diagram is as follows: Figure 8 As shown, as the blade rotates, the local A (such as Fig. 9 ) is the state where the trigger assembly 5 triggers the first proximity switch 31 (A1=3° trigger) at the initial position 530 (0° position) and the first trigger position 531, and the local B (such as Fig.10 ) is a state where the second trigger position 532 triggers the second proximity switch 32 (A1+A2=86° trigger) and the third trigger position 533 triggers the limit switch 2 (90° trigger).

[0064] The installation angle of the proximity switch and limit switch installed on the hub relative to the zero point position of the hub is used to set the installation angle of the trigger component relative to the zero point position of the blade. When the zero position of the blade is not uniform, there is no need to change the position of the proximity switch and limit switch on the hub. When using a set of hubs to debug multiple blades of different models, it is ensured that the proximity switch and limit switch are triggered accurately, which is conducive to batch debugging of wind turbines.

[0065] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for arranging trigger components of proximity switches and limit switches of a wind turbine generator set, characterized in that: The following steps are involved: Taking the hub rotation center as the center of the circle, set the angle A1 between the first proximity switch and the zero-degree position of the hub, the angle A2 between the first proximity switch and the second proximity switch, and the angle B2 between the second proximity switch and the limit switch; Set the angle C2 covered by the trigger component, the angle C1 of the proximity switch trigger unit on the trigger component = B2-(E-A1-A2), E is the trigger angle of the limit switch; The position where the blade root and the blade zero position form an angle D is the installation position of the trigger assembly, and the angle D satisfies the following formula: D=B2-E+A2-C2 / 2+A1; The first proximity switch, the second proximity switch and the limit switch are located at the edge of the hub, and the trigger assembly is located at the root of the blade; the trigger assembly includes a limit switch trigger unit, the proximity switch trigger unit is located on the upper surface of the limit switch trigger unit, and the connection unit is located on the lower surface of the limit switch trigger unit, and the connection unit is used to connect with the edge of the inner surface of the root of the blade; the trigger assembly rotates with the blade and passes through the initial position, the first trigger position, the second trigger position and the third trigger position in sequence; The initial position is the zero-degree position of the blade; the first trigger position is the position where the proximity switch trigger unit is close to the first proximity switch, causing the first proximity switch to be triggered, and the trigger angle is A1; the second trigger position is the position where the proximity switch trigger unit is close to the second proximity switch, causing the second proximity switch to be triggered, and the trigger angle is A1+A2; the third trigger position is the position where the limit switch trigger unit is close to the limit switch, causing the limit switch to be triggered.

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