CN206694183U - A kind of electric generator driven by weak wind - Google Patents

Abstract

The utility model provides a low-wind-speed wind power generation device, comprising: a tower frame, a rotating shaft, an air duct part, a power generation part and a wind direction adjustment part. The air duct part is connected with the rotating shaft and consists of an air collecting hood, a steady flow channel and an exhaust channel. The air collecting hood and the exhaust channel are reduced in size. A steady-flow channel with equal cross-section is arranged between them; the power generation part is located in the steady-flow channel, including the generator and the first-stage impeller and the second-stage impeller respectively arranged at the minimum cross-flow section of the wind collecting hood and the exhaust channel. The impellers are respectively connected to the generator through the first rotating shaft and the second rotating shaft; and the wind direction adjusting part is arranged in the generator and drives the rotating shaft according to the detection result of the wind direction detecting part to adjust the direction of the air duct. The low-wind-speed wind power generation device provided by the utility model improves the utilization rate and power generation efficiency of low-wind-speed wind energy and reduces noise pollution through the multiple power generation equipment of the air duct and two-stage impellers.

Description

A low wind speed wind power generation device

technical field

The utility model relates to the technical field of wind power generation, in particular to a low wind speed wind power generation device.

Background technique

As a clean and renewable energy, wind energy has been paid more and more attention to the utilization of wind energy at home and abroad. According to statistics, the world's wind energy reserves are not only huge, but the energy that can be utilized is ten times greater than the total amount of water energy that can be developed and utilized on the earth. my country's wind energy development is mainly concentrated in high wind speed areas with rich wind energy resources, such as the three north regions (Northeast, North China, Northwest) and the southeast coast. However, the area of such areas only accounts for 10% of the country's wind energy developable area, and because some of these areas are economically underdeveloped, it is necessary to build a strong power grid to achieve large-capacity wind power transmission, and the cost is huge. In fact, according to the analysis of geographical and meteorological data, my country's low wind speed wind energy resources are abundant and widely distributed, accounting for about 68% of the total area of the country. And studies have shown that the output of mainstream wind turbines varies significantly with wind speed in the low wind speed section, that is, the slope of the power curve is relatively large. Therefore, the development of such low wind speed wind energy resources has become one of the important directions of my country's wind power development, and has become an important supplementary force for my country to achieve the 2020 energy conservation and emission reduction goals and the development goals of renewable resources.

The wind power generation device widely used today is generally composed of a wind rotor, a generator and a tower. However, in order to obtain more wind energy, the blades of traditional wind turbines need to be made larger and larger to meet the requirements for utilization of low-speed wind energy, but such requirements will result in increased economic costs. In addition, the low utilization rate of wind energy and the noise generated by wind energy devices also affect the utilization of wind energy in low-speed areas.

Utility model content

The present invention was made to solve the above problems, and an object of the present invention is to provide a low wind speed wind power generator.

The invention provides a low-wind-speed wind power generation device, which is used to convert the wind energy of the low-wind-speed air into electric energy, which is characterized in that it comprises: a tower frame fixed on the ground; a rotating shaft rotatably arranged on the tower frame away from the ground One end of the air channel; the air duct part is fixedly connected with the rotating shaft, including the steady flow channel connected with the rotating shaft, the wind collecting hood connected with one end of the steady flow channel and the exhaust channel connected with the other end of the steady flow channel; the power generation part is set At the upper end of the rotating shaft, it includes a generator set on the rotating shaft and connected to the first rotating shaft and the second rotating shaft, and is arranged at the minimum flow section of the wind collecting hood to connect with the first rotating shaft and has a diameter slightly smaller than the smallest of the wind collecting hood. The first-stage impeller with the diameter of the flow section and the second-stage impeller connected to the second rotating shaft at the minimum flow section of the exhaust passage and the second-stage impeller with a diameter smaller than the minimum flow section diameter of the exhaust passage; Inside the machine, the rotating shaft is driven according to the detection result of the wind direction detecting unit, and the direction of the air duct connected to the rotating shaft is further adjusted.

In a low-wind-speed wind power generation device provided by the utility model, it may also have such a feature: wherein, the diameter of the end of the wind collecting hood away from the flow stabilization channel is larger than the diameter of the other end of the wind collecting hood close to the flow stabilization channel.

In a low-wind-speed wind power generation device provided by the utility model, it may also have such a feature: wherein, the diameter of the end of the exhaust channel away from the steady flow channel is smaller than the diameter of the other end of the exhaust channel close to the steady flow channel.

In a low-wind-speed wind power generation device provided by the utility model, it may also have such a feature: wherein, the upper half of the casing of the steady flow channel is provided with a solar coating.

In a low-wind-speed wind power generation device provided by the utility model, it may also have such a feature: wherein, the wind direction detection part includes four speedometers arranged at the end of the wind collecting hood away from the steady flow passage, when the speed measured by the speedometer When the deviation exceeds the deviation range, the speedometer feeds back the deviation signal to the wind direction control department for adjustment; when the speed deviation measured by the speedometer is within the deviation range, the feedback ends and the adjustment process ends.

Function and effect of utility model

According to the low wind speed wind power generation device provided by the utility model, the wind energy is convenient to be collected due to the adoption of the air duct part, and the air duct part includes the wind collecting hood, the steady flow passage and the exhaust passage; The gradual reduction of the cross-section increases the wind speed, thereby increasing the rotation speed of the driving impeller and improving the power generation efficiency; due to the gradual reduction of the exhaust passage through the over-current cross-section, the wind speeds up again in the exhaust passage and drives the next The stage impeller rotates to generate wind power, which further improves the power generation efficiency; because the impeller is placed in the air duct, the problem of noise pollution caused by blade vibration or other reasons is improved; because the wind direction detection part and the wind direction adjustment part are adopted, the air duct The top is always facing the incoming wind direction, which improves the utilization rate of wind energy. In summary, due to the use of low wind speed power generation devices, wind energy utilization and power generation efficiency are improved, noise pollution is also reduced, and the structure is simple and easy to maintain. It can be used in low wind speed wind energy resource areas such as urban and rural areas.

Description of drawings

Fig. 1 is the structural representation of the low wind speed wind power generation device provided in the embodiment of the present utility model;

Fig. 2 is a schematic structural view of a low wind speed wind power generation device provided in an embodiment of the present invention;

Fig. 3 is a schematic structural view of the air duct part of the low wind speed wind power generation device provided in the embodiment of the present utility model; and

Fig. 4 is a schematic diagram of the control flow of the wind direction adjustment unit provided in the embodiment of the present invention.

detailed description

In order to make the purpose and effect of the technical means realized by the utility model easy to understand, the following embodiments will specifically describe a low-wind-speed wind power generation device of the utility model in conjunction with the accompanying drawings.

<Example>

Fig. 1 is a schematic structural view of a low wind speed wind power generation device provided in an embodiment of the present utility model; Fig. 2 is a schematic structural view of a low wind speed wind power generation device provided in an embodiment of the present utility model; Fig. 3 is an implementation of the present utility model The structural schematic diagram of the air duct part of the low wind speed wind power generation device provided in the example.

As shown in FIG. 1 , FIG. 2 and FIG. 3 , the low wind speed wind power generation device 100 includes a tower 10 , a rotating shaft 20 , an air duct 30 , a power generation unit 40 , a wind direction detection unit 50 and a wind direction adjustment unit 60 .

The tower 10 is fixed to the ground.

The rotating shaft 20 is rotatably arranged at one end of the tower 10 away from the ground.

As shown in FIG. 2 and FIG. 3 , the air channel part 30 is connected to the rotating shaft 20 and includes a flow stabilization channel 31 , an air collecting hood 32 and an air exhaust channel 33 .

The steady flow channel 31 is connected with the rotating shaft 20 and is used for stabilizing the airflow so that the airflow can flow uniformly and at a consistent speed.

As shown in FIG. 3 , the upper half of the shell of the steady flow channel 31 is provided with a solar coating 311 for photovoltaic power generation.

The wind collecting hood 32 is connected with one end of the flow stabilization channel 31 for collecting wind and increasing the wind speed.

The exhaust channel 33 is connected with the other end of the steady flow channel 31 for further increasing the wind speed.

As shown in FIG. 2 and FIG. 3 , the power generating unit 40 is disposed on the upper end of the rotating shaft 20 and includes a generator 41 , a first rotating shaft 42 , a second rotating shaft 43 , a first-stage impeller 44 and a second-stage impeller 45 .

The generator 41 is provided on the upper end of the rotating shaft 20 .

The first rotating shaft 42 and the second rotating shaft 43 are arranged on two sides of the generator 41 .

The first-stage impeller 44 is arranged in the wind collecting hood 32 and is connected to the first rotating shaft 42 . The diameter of the first-stage impeller 44 is slightly smaller than the diameter of the end of the air collecting hood 32 near the steady flow channel.

The second-stage impeller 45 is disposed in the exhaust channel 33 and connected to the second rotating shaft 43 . The diameter of the second-stage impeller 45 is slightly smaller than the diameter of the end of the exhaust channel 33 away from the steady flow channel.

As shown in FIG. 3 , the wind direction detection part 50 is disposed at the end of the wind collecting hood 32 away from the steady flow channel 31 , and is used for detecting the wind direction of the low wind speed air.

As shown in FIG. 3 , the wind direction adjusting unit 60 is located in the generator 43 , drives the rotating shaft 20 according to the detection result of the wind direction detecting unit 50 , and further adjusts the direction of the air duct 30 connected to the rotating shaft 20 .

Fig. 4 is a schematic diagram of the control flow of the wind direction adjustment unit provided in the embodiment of the present invention.

The wind direction detection unit 50 includes four speedometers 51 arranged at the end of the wind collecting hood 32 away from the steady flow channel 31 .

When the speed deviation measured by the speedometer 51 exceeds the deviation range, the speedometer 51 feeds back the deviation signal to the wind direction control part 60 for adjustment; when the speed deviation measured by the speedometer 51 is within the deviation range, the feedback ends and the adjustment process ends .

The working process of the low wind speed wind power generation device of the present embodiment:

The air-inducing part is completed by the wind-collecting hood 32, which is a tapered channel whose cross-sectional area gradually decreases along the flow direction. The wind group with a certain wind speed reaches the first-stage impeller 44 and pushes the first-stage impeller 44 to rotate to do work. The first rotating shaft 42 is driven by the impeller rotation center to generate mechanical kinetic energy and is connected to the generator 41 for power generation. Due to the speed-up and guiding effect of the wind-collecting hood 32, the wind group is uniform and the direction is fixed, so the blades of the first-stage impeller 44 can be designed as the best force-bearing position, and it is not necessary to adopt the pitch-changing technology to adapt to the wind direction, which is conducive to the utilization of wind force. maximum kinetic energy. At the steady flow channel 31 , the airflow with residual velocity after the work done by the first stage impeller 44 merges with the airflow leaked from the gap between the impeller and the inner wall of the channel. Due to the uneven velocity, a steady flow is required. After passing through the steady flow channel 31 , the residual wind with uniform airflow and basically the same speed enters the exhaust channel 33 , and the design of the exhaust channel 33 is similar to that of the wind collecting hood 32 . The remaining wind can be further accelerated to increase the residual energy, and finally blow to the second-stage impeller 45 at the outlet of the exhaust passage 33 with a uniform flow rate. The second-stage impeller 45 is driven by the residual wind, and the rotational work is transmitted to the second rotating shaft 43 and then to the generator 41 . The solar coating 311 part of the housing of the steady flow channel 31 simultaneously generates photovoltaic power. The design of the air duct makes the wind evenly applied to the best stress points of the blades of the first-stage impeller 44 and the second-stage impeller 45, which not only improves the utilization rate of the wind energy of the impeller but also prolongs the life of the blades and improves economic benefits .

The control unit 60 is located inside the motor 43 and performs the task of adjusting the wind direction. The control process is mainly as follows with reference to FIG. A speed measurement, when the direction of the airflow is not facing the inlet, the speed of the four speedometers 51 will have a large deviation beyond the deviation range. The speedometer feeds back the deviation signal to the control part 60, and the control part 60 starts the rotation shaft 20 coaxial with the tower 10 to rotate. During the adjustment process, the speed measurement signal of the speedometer 51 is fed back to the adjustment unit 60 at a high frequency until the speed deviation is within the set deviation range, the feedback ends, and the adjustment process ends.

Generally, the annual average wind speed in low wind speed areas is 5.5-6.5m/s, and the annual sunshine time in mid-latitude areas is about 1200h. Here, we take the average wind speed of the incoming stream as 6m/s. Considering that the flow loss is 10%, the incoming wind speed can be increased by an average of 1.5 times through the wind collecting hood 32 . According to the calculation formula of wind energy density: E=ρV ³ /2, when the wind speed is 6m/s, the wind energy density is 132w/m ² , and when the wind speed increases to 9m/s, the wind energy density reaches 447w/m ² . According to the engineering calculation formula of the blade diameter: P=ρV ³ πD ² Cpη/8 (where P—the output power of the wind turbine, V—the rated wind speed, D—the diameter of the blade, Cp—the power coefficient of the wind wheel, η—the efficiency of power generation and mechanical transmission It is related to the performance of the motor), it can be concluded that when the rated wind speed increases by 1.5 times and the power coefficient of the wind rotor increases, the blade diameter will decrease by about 2.5 times. Coupled with the utilization of residual wind and residual energy, the utilization rate of wind energy can reach more than 90%. To sum up, two-stage wind energy utilization, coupled with solar coating 311 for photovoltaic power generation, will greatly improve power generation efficiency. The size should be reduced by 2.5 to 2.8 times, the structure is compact and the cost saving is considerable.

Function and effect of embodiment

According to the low-wind-speed wind power generation device involved in this embodiment, the wind energy is convenient to collect due to the use of the air duct part, and the air duct part includes an air collecting hood, a steady flow channel and an air exhaust channel; by adopting the air collecting hood, the The wind speed is increased, so that the rotation speed of the driving impeller is increased, and the power generation efficiency is improved; due to the use of the exhaust channel, the wind speed is increased again in the exhaust channel, and the next impeller is driven to rotate for wind power generation, which further improves the power generation efficiency; Because the impeller is placed in the air duct part, the noise pollution problem caused by blade vibration or other reasons is improved; because the wind direction detection part and the wind direction adjustment part are used, the utilization rate of wind energy is improved.

The above embodiments are preferred cases of the present utility model, and are not intended to limit the protection scope of the present utility model.

As in this embodiment, the diameter of the end of the wind collecting hood away from the flow stabilization channel is larger than the diameter of the other end of the wind collecting hood close to the flow stabilization channel.

As in this embodiment, the diameter of the end of the exhaust channel away from the steady flow channel is smaller than the diameter of the other end of the exhaust channel close to the steady flow channel.

As in this embodiment, the upper half of the housing of the steady flow channel is provided with a solar coating for photovoltaic power generation.

In addition, in this embodiment, four speedometers are arranged at the end of the wind collecting hood away from the steady flow passage for adjusting the wind direction and improving the utilization rate of wind energy.

In summary, due to the use of low wind speed power generation devices, wind energy utilization and power generation efficiency are improved, noise pollution is also reduced, and the structure is simple and easy to maintain. It can be used in low wind speed wind energy resource areas such as urban and rural areas. In addition, the low wind speed power generation device in this embodiment can also be used in rural fields to improve the phenomenon of abandoning wind and light, and use the device to generate electricity to provide electricity for mechanical farm tools and the like.

Claims (5)

1. A low-wind-speed wind power generation device, used for converting the wind energy of low-wind-speed air into electric energy, is characterized in that, comprising: a tower, fixed to the ground; a rotating shaft, rotatably arranged at the end of the tower away from the ground, coaxial with the tower; The air channel part is fixedly connected with the rotating shaft, and includes a flow stabilization channel connected with the rotation shaft, a wind collecting hood connected with one end of the flow stabilization channel, and an exhaust channel connected with the other end of the flow stabilization channel ; The power generation part is set on the upper end of the rotating shaft, including a generator set on the rotating shaft and connected to the first rotating shaft and the second rotating shaft, and a generator set on the wind collecting hood close to the steady flow channel tube A first impeller with one end connected to the first rotating shaft and having a diameter smaller than the diameter of the end of the air collecting hood near the steady flow channel tube, and a first impeller arranged in the exhaust channel tube connected to the second rotating shaft and having a diameter smaller than the exhaust The second impeller with a diameter away from the end of the air channel barrel away from the steady flow channel barrel; a wind direction detection unit for detecting the wind direction of the low wind speed air; and The wind direction adjusting unit is arranged in the generator, drives the rotating shaft according to the detection result of the wind direction detecting unit, and further adjusts the direction of the air duct connected to the rotating shaft. 2. A low wind speed wind power generation device according to claim 1, characterized in that: Wherein, the diameter of the end of the wind collecting hood away from the flow stabilization channel is larger than the diameter of the other end of the wind collecting hood close to the flow stabilization channel. 3. A low wind speed wind power generation device according to claim 1, characterized in that: Wherein, the diameter of the end of the exhaust channel away from the steady flow channel is smaller than the diameter of the other end of the exhaust channel close to the steady flow channel. 4. A low wind speed wind power generation device according to claim 1, characterized in that: Wherein, the upper half of the shell of the steady flow channel is provided with a solar coating. 5. A low wind speed wind power generation device according to claim 1, characterized in that: Wherein, the wind direction detection part includes four speedometers arranged at the end of the wind collecting hood away from the steady flow channel, When the speed deviation measured by the speedometer exceeds the deviation range, the speedometer feeds back the deviation signal to the wind direction adjustment part for adjustment; when the speed deviation measured by the speedometer is within the deviation range, the feedback ends , the adjustment process ends.