CN201090369Y - Flexible speed control device of wind motor wings - Google Patents

Abstract

The utility model relates to a flexible speed-adjusting device for wings of wind power generator, belonging to a speed-adjusting device used on wings of wind power generator. The utility model solves the problem that the speed-adjusting device of the prior medium-small wind power generator has low output power or no output power when wind speed reaches or exceeds rated design rotating speed so that the wind power can not be utilized properly. A tensioning spring 6 is sleeved a fixing shaft 3 and also arranged between a first spring fixing sleeve 5 and a second spring fixing sleeve 8, the shaft bush 4, the first spring fixing sleeve 5 and the second spring fixing sleeve 8 are respectively connected fixedly with the side wall of the flexible speed-adjusting body 2, the flexible speed-adjusting body 2 is rotatably connected with the fixing shaft 3. The utility model can improve high-speed high-quality wind energy utilization ratio of wind power generator greatly, when the wind speed of wind wheel reaches or exceeds rated design rotating speed, the rotating speed of the wind wheel can still keep at higher level, at the time entire wind power generating device still can output higher electric power.

Description

Flexible speed regulation device for wind turbine blades

technical field

The utility model relates to a speed regulating device used on the wings of a wind power generator.

Background technique

The wind energy utilization factor is an important index to evaluate the performance of a wind turbine. The utilization coefficient of wind energy is closely related to the design of wind turbine blades. For a specific wind field, its annual average wind speed is often used as the design wind speed of the wind turbine blades. When the wind speed exceeds the design wind speed, the load acting on the wind turbine blades will exceed its design load. If the wheel is overloaded, the wind wheel will run at an overspeed, and the blades on the wind wheel will be subjected to greater centrifugal force so that they will be damaged. In order to avoid this situation, a speed regulator is often used in the design of wind turbines to limit the speed of the wind rotor to protect the blades on it from damage. When the wind speed is too high, the speed regulator can limit the power and reduce the effect on External forces on the rotor blades.

The existing speed control devices are roughly divided into two categories, one is the fixed blade wind turbine speed governor, which is mostly used in small and medium-sized wind turbines; the other is the variable pitch wind turbine speed control The general structure of the governor is relatively complicated, and it is often used in the design of medium and large wind turbines. On small and medium-sized wind turbines, fixed tail rudders and aerodynamic brakes are mainly used. In the design of fan impellers with fixed tail rudders and aerodynamic brakes, the aerodynamic brake impeller is mostly used to directly rotate the brake fins on the top of the wind wheel. 90 degrees, the rotation resistance torque is directly generated, thereby quickly reducing the rotation speed of the impeller, the wind wheel is at a low speed, the output power is very low or the output is stopped; generally, this part accounts for 1/10 of the windward area of the entire blade, and the wind energy cannot be very high at this time. Good to use.

Utility model content

The utility model solves the problem of the speed regulating device on the existing small and medium-sized wind power generators. When the wind speed reaches or exceeds its rated design speed, the speed regulating device directly rotates the brake fins on the top of the wind wheel by 90 degrees, and directly generates the rotation resistance torque. , so as to quickly reduce the rotation speed of the impeller, the wind rotor is at a low speed, the output power is very low or the output is stopped, so that the wind energy cannot be well utilized, and a flexible speed regulating device for the blades of the wind turbine is provided.

The technical scheme of the utility model is: the flexible speed regulating device of the blade of the wind power generator comprises a flexible speed regulating main body, a fixed shaft, a compression spring, a shaft sleeve, a first spring fixed sleeve, a second spring fixed sleeve, the fixed shaft One end of the fixed shaft is inserted into the inner cavity of the flexible speed regulating body, the other end of the fixed shaft is fixedly connected to the blade of the wind turbine, and the shaft sleeve, the first spring fixed sleeve, and the second spring fixed sleeve are sequentially set on the fixed on the shaft and all three are in clearance fit with the fixed shaft, the compression spring is set on the fixed shaft and is located between the first spring fixed sleeve and the second spring fixed sleeve, the shaft sleeve, the first spring fixed sleeve, the second spring The fixed sleeves are respectively fixedly connected to the side walls of the flexible speed-regulating main body, and the flexible speed-regulating main body is rotatably connected to the fixed shaft.

The utility model has the following beneficial effects: the use of the flexible speed regulating device of the utility model greatly improves the high-speed and high-quality wind energy utilization rate of the wind power generator. It can be maintained at a relatively high level, and the wind wheel will not be overrun and damaged. At this time, the entire wind power device can still output high electric power, so as to make full use of this part of high-quality wind energy, greatly improve the utilization rate of wind energy, and the working range of wind turbines is wider. Wider, more output power. Using the design method of compression spring and threaded connection, on the one hand, by adjusting the elastic coefficient of the spring, it can be determined that the design of the wind rotor meets the limit speed setting range, that is, to determine the range of available wind speed; on the other hand, through the compression force of the spring and the top wing The mutual balance relationship between the centrifugal forces on the blades can achieve flexible or smooth control of the change in the speed of the wind rotor. Within the allowable limit wind speed (shutdown protection wind speed), the wind turbine can still output electric power continuously and stably.

Description of drawings

Fig. 1 is a structural schematic diagram of the utility model, Fig. 2 is a structural schematic diagram of the utility model rotated 90 degrees relative to the blades of the wind power generator, and Fig. 3 is a top view of Fig. 1 .

Detailed ways

Embodiment 1: As shown in Figure 1 and Figure 2, the flexible speed regulating device of the wind turbine blade in this embodiment consists of a flexible speed regulating main body 2, a fixed shaft 3, a compression spring 6, a bushing 4, a first The spring fixed sleeve 5 and the second spring fixed sleeve 8 are composed of one end of the fixed shaft 3 inserted into the inner cavity of the flexible speed regulating body 2, and the other end of the fixed shaft 3 is fixedly connected to the blade 11 of the wind power generator. The shaft sleeve 4, the first spring fixed sleeve 5, and the second spring fixed sleeve 8 are sequentially set on the fixed shaft 3 from top to bottom, and all three are in clearance fit with the fixed shaft 3, and the compression spring 6 is set on the fixed shaft 3 and Located between the first spring fixing sleeve 5 and the second spring fixing sleeve 8, the shaft sleeve 4, the first spring fixing sleeve 5, and the second spring fixing sleeve 8 are respectively affixed to the side wall of the fixed shaft 3 for flexible speed regulation The main body 2 is rotatably connected with the fixed shaft 3 .

Embodiment 2: As shown in FIG. 3 , the included angle α between the blades 11 of the wind power generator and the flexible speed-regulating body 2 in this embodiment is 0-90°. 0° and 90° are the limit positions of the speed regulation respectively. During the speed regulation, the included angle α gradually changes from 0° to 90°, so as to realize flexible speed regulation. Other compositions and connections are the same as in the first embodiment.

Embodiment 3: As shown in FIG. 1 , this embodiment also includes an end cover 1 , and the end cover 1 covers the flexible speed regulating body 2 at the upper end of the shaft sleeve 4 . This design reduces resistance. Other compositions and connections are the same as in the first embodiment.

Specific Embodiment Four: As shown in Figure 1 and Figure 2, this embodiment also includes a dustproof protective cover 10, the dustproof protective cover 10 is arranged between the flexible speed regulating main body 2 and the wind turbine blade 11 and is connected with The flexible speed regulating main body 2 is fixedly connected. When the flexible speed regulating device rotates, a certain gap will be formed between the blades 11 of the wind power generator and the flexible speed regulating body 2. In order to prevent the spiral groove from being exposed to the external environment, a dustproof protective cover is designed to prevent dust The erosion of the spiral groove by sand, snow and rain makes the speed regulating mechanism operate flexibly. Other compositions and connections are the same as in the first embodiment.

Embodiment 5: As shown in FIG. 1 , the root 9 of the flexible speed regulating body 2 described in this embodiment is connected to the fixed shaft 3 by thread. With such a design, the connection is strong and self-locking. Other compositions and connections are the same as in the first embodiment.

Working principle: The utility model is a set of flexible speed regulating device installed at the end of the wind turbine blades, and the rotation speed of the wind turbine blades is controlled by the rotation of the flexible speed regulating body 2 on it. When the wind speed exceeds the design rated wind speed, the flexible speed regulating device starts to work, the flexible speed regulating body 2 overcomes the pressing force F2 of the compression spring 6 under the action of the centrifugal force F1, the flexible speed regulating body 2 moves upwards, and at the same time moves along the fixed axis 3 Rotate until the centrifugal force F1 is balanced with the pressing force F2. When the wind speed drops to the design rated value, the rotating speed of the wind rotor decreases, and under the action of spring compression force, the flexible speed regulating body 2 returns to the original design position. Under normal working conditions, the wind speed is lower than the rated speed specified by its design, and the pressing force of the compression spring 6 in the flexible speed regulating device is greater than the centrifugal force F1 received by the flexible speed regulating body 2 due to the rotation, so the flexible speed regulating body 2 It is always at the original design position (that is, the angle α between the blades 11 of the wind-driven generator and the flexible speed-regulating main body 2 is 0°). When the wind speed reaches or exceeds its rated design speed, the centrifugal force F1 received by the flexible speed-regulating main body 2 is greater than the spring pressing force F2, the utility model starts to work, the pressing spring 6 is compressed, and the flexible speed-regulating main body 2 moves along the fixed axis 3 The rotation of the spiral groove of the wind turbine blade 11 increases the resistance torque, the rotation speed of the impeller decreases, the pressing force F2 of the compression spring 6 is greater than the centrifugal force F1 received by the flexible speed regulating body 2, and the rotation angle of the flexible speed regulating body 2 is α It will be partially retracted until the centrifugal force F1 and the spring pressing force F2 reach a balance. Under this wind speed, the impeller works to a new stable state. At this time, the wind energy is fully utilized, and the output power of the entire wind power device is slightly higher than its designed rated output power. The wind power installation is working at full load. When the wind speed further increases until it reaches the maximum limit speed allowed by the design, under the action of the centrifugal force F1 on the flexible speed regulating body 2, the spring is compressed to a certain stroke (limit stroke), at this time, the rotation angle of the flexible speed regulating body 2 (along the fixed axis 3) has formed an angle of 90 degrees (limit value) with its original position, and the resistance formed by the flexible speed regulating body 2 limits the further increase of the impeller speed. Now, for preventing the damage of the blades of the wind-driven generator, the mechanical braking device should be activated urgently to stop the rotation of the wind wheel of the wind-driven generator.

Claims (5)

1. A flexible speed regulating device for wind turbine blades, characterized in that it comprises a flexible speed regulating main body (2), a fixed shaft (3), a compression spring (6), an axle sleeve (4), a first spring The fixed sleeve (5), the second spring fixed sleeve (8), one end of the fixed shaft (3) is inserted into the inner cavity of the flexible speed regulating body (2), and the other end of the fixed shaft (3) is fixedly connected to the wind power generator On the airfoil (11), the bushing (4), the first spring fixing sleeve (5), and the second spring fixing sleeve (8) are sequentially set on the fixing shaft (3) from top to bottom and all three It fits with the fixed shaft (3) in a gap, and the compression spring (6) is sleeved on the fixed shaft (3) and is located between the first spring fixed sleeve (5) and the second spring fixed sleeve (8), and the shaft sleeve ( 4), the first spring fixing sleeve (5) and the second spring fixing sleeve (8) are fixedly connected to the side wall of the flexible speed regulating body (2) respectively, and the flexible speed regulating body (2) is rotationally connected with the fixed shaft (3) . 2. The flexible speed-regulating device for wind-driven generator blades according to claim 1, characterized in that the angle α between the wind-driven generator blades (11) and the flexible speed-governing main body (2) is 0～ 90°. 3. The flexible speed regulating device of the blade of the wind power generator according to claim 1, characterized in that it also includes an end cover (1), and the flexible speed regulating device on the upper end of the shaft sleeve (4) is covered by the end cover (1). on the speed main body (2). 4. The flexible speed regulating device of the blade of the wind power generator according to claim 1, characterized in that it also includes a dustproof protective cover (10), and the dustproof protective cover (10) is arranged on the flexible speed regulating main body ( 2) It is fixedly connected with the blades (11) of the wind power generator and with the flexible speed regulating main body (2). 5. The flexible speed regulating device for wind turbine blades according to claim 1, characterized in that the root (9) of the flexible speed regulating main body (2) is connected to the fixed shaft (3) by threads.

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