CN201723385U - Stepped blade - Google Patents

Abstract

A stepped blade that is simple in structure, high in sensitivity, and can adapt to small wind changes to adjust the windward angle, and is used in the field of wind power generators, including blades and keels. The blade section and at least one variable pitch blade section are spliced together. The fixed variable pitch blade section and the variable pitch blade section are connected in series on the keel, and the fixed pitch variable blade section is fixedly connected to the keel. The pitch blade section can rotate along the longitudinal axis of the keel, and a pitch actuator is arranged between the pitch variable blade section and the keel, and the pitch actuator is connected with a pitch control mechanism. The blade, using the control actuators with different thresholds, can make part or all of the blade section feather or return according to the change of wind force. Harvest wind energy.

Description

stepped paddle

technical field

The utility model relates to a blade, in particular to a blade of a wind power generator.

Background technique

As a new type of energy, wind power is being used more and more in the field of power generation because there is no fuel problem, no radiation or air pollution when using wind power; the principle of wind power generators is to use wind power to drive windmill blades Rotate, and then increase the speed of rotation through the transmission to drive the generator to generate electricity; according to the current windmill technology, it can start generating electricity at a breeze speed of about three meters per second (the degree of breeze). In the mainland, small wind A generator will be more suitable than a large one, because it is easier to be driven by a small wind volume to generate electricity, and a continuous small wind can supply greater energy than a momentary gust of wind. In the prior art, one-piece blades are usually used to adjust the amount of wind received by changing the overall windward angle to achieve the effect of stabilizing the output voltage and power. However, such a technical solution still has the following problems: due to wind power generation The blades of the aircraft are usually large, and the overall adjustment speed is slow. At the same time, when the windward angle of the blades is adjusted integrally, the sensitivity is low.

Utility model content

The main purpose of the utility model is to provide a stepped paddle with simple structure, high sensitivity, and the ability to adapt to small wind changes and adjust the windward angle.

In order to solve the above problems, the technical solution adopted by the utility model is: a stepped paddle, including a paddle and a keel, the paddle is trapezoidal and consists of a fixed pitch variable blade section and at least one variable pitch blade section The fixed variable pitch blade section and the variable pitch blade section are connected in series on the keel, the fixed variable pitch blade section is fixedly connected with the keel, and the variable pitch blade section can rotate along the longitudinal axis of the keel , A pitch-variable actuator is arranged between the pitch-variable blade section and the keel, and the pitch-variable actuator is connected with a pitch-variable control mechanism.

The pitch control actuator includes a wind speed sensor arranged on the blade, the wind speed sensor is connected with a control circuit, and the control circuit is connected with the pitch actuator.

The variable pitch actuator includes at least one motor arranged in the keel, the output end of the motor is fixedly connected to the pitch variable blade section, and the motor is connected to the control circuit;

The pitch variable actuator is a spring, and the two ends of the spring are fixedly connected to the pitch variable blade section and the keel respectively;

The spring is a helical torsion spring;

The rotation axis of the pitch variable blade segment is collinear with the axis of the keel;

The control executive mechanism includes a wind speed sensor arranged on the tower of the wind power generator, the wind speed sensor is connected to the control circuit, at least one motor is arranged in the keel, and the output shaft of the motor is fixedly connected to the variable pitch blade section , the motor is connected to the control circuit.

The mode of work of the present utility model is as follows:

When the wind blows the blades, the keel drives the hub to rotate, which drives the rotor magnet on the hub to rotate, and electromagnetically induces with the winding to convert wind energy into electrical energy.

When the wind speed is fast, the control actuator starts from the blade far away from the hub and drives one or more variable-pitch blade segments to feather in order to ensure the stability of the hub rotation speed.

When the wind speed is slow, the control actuator starts from the blade close to the hub, and drives one or more pitch-variable blade segments back to the blade in turn to ensure the stability of the hub rotation speed.

Among them, the pitch-variable blade section away from the hub has a small area and sensitive sensing, so the pitch-variable blade section far away from the hub should give priority to feathering or returning.

Compared with the prior art, the stepped paddle provided by the utility model has the following advantages: the paddle with multi-section structure is used, and the control actuators with different thresholds can be used to make the paddle sections partly or completely smooth according to the change of wind force. The propeller or back propeller has high sensitivity and can collect wind energy at the maximum windward angle while ensuring the stability of generator power and voltage.

The pitch control actuator includes a wind speed sensor arranged on the blade, the wind speed sensor is connected to a control circuit, and the control circuit is connected to the pitch actuator; using the wind speed sensor and the corresponding control circuit and actuator, It can make the blades accurately control the feathering and returning of the blades according to the preset scheme, and at the same time, the signal collected by the wind speed sensor is more accurate and more sensitive.

The use of springs as the control actuator has the beneficial effect of simple structure, and the control actuator itself does not need to consume electric energy. The stiffness of the spring can be set according to the needs of specific applications. The variable pitch blade section spring located at the far end of the wind turbine hub The stiffness is preferably smaller than that of the pitch variable blade section at the proximal end; the spring is a helical torsion spring, which can realize convenient installation and simplify the structure.

Description of drawings

The utility model will be described by way of examples and with reference to the accompanying drawings, wherein.

Fig. 1 is a structural schematic diagram of the utility model when all pitch-variable blade sections are back.

Fig. 2 is a schematic diagram of the structure of the pitch variable blade section of the utility model when it is partially feathered.

Fig. 3 is a schematic diagram of the structure of the utility model when the variable pitch propeller blades are all feathered.

Detailed ways

All features disclosed in this specification, or steps in all methods or processes disclosed, may be combined in any manner, except for mutually exclusive features and/or steps.

Any feature disclosed in this specification (including any appended claims, abstract and drawings), unless expressly stated otherwise, may be replaced by alternative features which are equivalent or serve a similar purpose. That is, unless expressly stated otherwise, each feature is one example only of a series of equivalent or similar features.

Below in conjunction with accompanying drawing, the utility model is further elaborated.

As shown in Figure 1, in this embodiment, the blade is composed of a fixed-pitch variable blade section 1 connected to the hub and a three-stage variable-pitch blade section 2, and the fixed-pitch variable blade section 1 is arranged near the wind power generator. On one side of the blade hub 3, the fixed variable-pitch blade section 1 and the variable-pitch blade section 2 are both set on the keel 4, and the two ends of the helical torsion spring are respectively installed on the variable-pitch blade section 2 and the keel 4, Preferably, the farther the helical torsion spring from the fixed pitch variable blade section 1 is, the smaller the stiffness is, and the easier it is to be deformed by force. Configuration is required. Preferably, the helical torsion spring at the far end of the hub 3 of the wind power generator has a lower stiffness than the helical torsion spring at the proximal end. Preferably, the variable pitch blade section 2 is fixed on the keel 4, and the rotation axis of the variable pitch blade section 2 is the same as the longitudinal axis of the keel 4, which can avoid the problem of excessive stress caused by too long moment arm.

As a further improvement of the utility model, a wind speed sensor can be installed on the blade, the signal output end of the wind speed sensor can be connected with the control circuit, and a slot for installing a motor is arranged in the keel 4. In this embodiment, three variable pitch The blade section 2 is correspondingly provided with three motors, the output ends of each motor are glued together with the corresponding variable pitch blade section 2, the output ends of the control circuit are respectively connected with each motor, and the control circuit receives the signal from the sensor. After the signal, it compares and judges with the preset threshold value of each sensor internally, and sends an electrical signal to a part or all of the motors, and the motor receiving the signal drives the corresponding blade to rotate to change the windward angle. Preferably, the angle away from the hub 3 is changed preferentially. Angle of variable pitch blade section 2.

The utility model usually adopts 2-4 groups to be installed on the blade hub 3 at the same time when in use, if the control circuit is used to control the angle of each pitch-variable blade section 2, the control circuit will control the angle of each pitch-variable blade section 2 to each group and each stage. The signals sent by 2 are preferably sent out synchronously, for example, the deployment signal is sent to the farthest variable-pitch blade section 2 of each set of blades at the same time, so as to ensure the dynamic balance of multiple sets of blades on the hub 3 .

As an equivalent embodiment of the present utility model, the output end of the motor may be directly bonded to the variable pitch blade section 2, or a connecting rod radial to the rotating plane may be provided, and the connecting rod and the variable pitch blade Section 2 is bonded or welded together; the motor can also be connected to the spring on the variable pitch blade section 2, and the driving spring changes the angle of the variable pitch blade section 2. Since its function and effect are similar to the above, it will not be discussed here. Let me repeat them one by one.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present utility model shall be included in this utility model. within the scope of protection of utility models.

Claims (7)

1. A stepped blade is characterized in that: it comprises a blade and a keel (4), and the blade is trapezoidal and consists of a fixed pitch variable blade section (1) and at least one variable pitch blade section (2 ) spliced together, the fixed variable pitch blade section (1) and the variable pitch blade section (2) are connected in series on the keel (4), and the fixed variable pitch blade section (1) and the keel (4) Fixedly connected, the pitch variable blade section (2) can rotate along the longitudinal axis of the keel (4), and a pitch variable actuator is arranged between the variable pitch blade section (2) and the keel (4), and the variable pitch blade section (2) is arranged between the keel (4). The pitch actuator is connected with a pitch control mechanism. 2. The stepped blade according to claim 1, characterized in that: the pitch control actuator includes a wind speed sensor arranged on the blade, the wind speed sensor is connected to a control circuit, and the control circuit is connected to the Pitch actuator connection. 3. The stepped blade according to claim 1, characterized in that: the variable pitch actuator includes at least one motor arranged in the keel (4), and the output end of the motor is connected to the pitch variable blade section (2) Fixed connection, the motor is connected with the control circuit. 4. The stepped blade according to claim 1, characterized in that: the variable pitch actuator is a spring, and the two ends of the spring are respectively fixed to the variable pitch blade section (2) and the keel (4) connect. 5. The stepped paddle according to claim 4, wherein the spring is a helical torsion spring. 6. The stepped blade according to claim 1, characterized in that: the rotation axis of the variable pitch blade section (2) is in line with the axis of the keel (4). 7. The stepped blade according to claim 1, characterized in that: the control actuator includes a wind speed sensor arranged on the wind turbine tower, the wind speed sensor is connected to the control circuit, and the keel (4) At least one motor is arranged inside, the output shaft of the motor is fixedly connected with the pitch-variable blade section (2), and the motor is connected with the control circuit.

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