CN108678901B - Energy buffer device of H-shaped vertical axis wind turbine - Google Patents

Abstract

The invention belongs to the field related to wind power generation technology, and discloses an H-type vertical axis wind turbine energy buffering device, which includes an energy buffering unit and a centrifugal speed regulating unit, wherein the energy buffering unit includes a The slider slides on the horizontal support rod, and the slider is connected to the main shaft through a buffer spring; the centrifugal speed regulating unit includes a fixed sleeve, a middle sleeve and a lower sleeve that are sleeved on the main shaft. The middle sleeve and the lower sleeve can be centrifuged with the The expansion and contraction of the spring slides up and down along the spindle; the collars with heavy objects are connected to three sleeves respectively, and the baffles connected to the collars are placed at the outer end of the slider to restrict the slider from sliding away from the spindle. Through the invention, the mutual conversion of the angular momentum of the slider and the wind turbine can be realized to maintain the stability of the output power of the wind turbine; and the influence of the slider on the starting performance of the wind turbine can be effectively prevented through the centrifugal speed regulating unit; at the same time, the production is simple, the cost is low and the The advantages of easy installation and wide applicability.

Description

An H-type vertical axis wind turbine energy buffer device

Technical field

The invention belongs to the field related to wind power generation technology, and more specifically, relates to an H-shaped vertical axis wind turbine energy buffering device.

Background technique

As of the end of 2016, my country's renewable energy power generation installed capacity has reached 570 million kilowatts, of which wind power has an installed capacity of 149 million kilowatts, accounting for 9.0% of the total installed power capacity. It is an important renewable energy power generation method. At present, in wind power generation, horizontal axis wind turbine technology is mature and accounts for the majority of the market share. However, research results show that vertical axis wind turbines are superior to horizontal axis wind turbines in many aspects and are currently an important development direction in the field of wind power generation.

Vertical axis wind turbines can be divided into resistance type wind turbines and lift type wind turbines according to different force modes. The resistance type wind turbine is a low-speed type, such as S type, and the lift type generator is a high-speed type, such as H type and H type. Type D. Among them, the H-type vertical axis wind turbine has the advantages of simple structure, easy installation and maintenance, no need for wind protection, low noise, strong wind resistance, and good performance at low speed, so it is widely used in small wind turbines. Although the H-type vertical axis wind turbine has many advantages, there are still some problems to be solved that hinder its development into a mainstream model. For example, the traditional H-shaped vertical axis wind turbine has a large blade tip speed and large fluctuations in rotation speed with changes in wind speed, resulting in poor output power stability, which is not conducive to wind power grid integration, and is prone to repeated starts and stops. question.

Some solutions have been proposed in the prior art to address the problem of unstable output power of H-type vertical axis wind turbines. For example, CN201010292326.8 discloses a vertical axis wind turbine, which improves the structure of the wind turbine blades. CN201310117771.4 discloses a variable pitch vertical axis wind turbine, which uses a control system to adjust the pitch of the blades. However, the above methods are technically complex and costly, so they are not very applicable and are not conducive to widespread application.

Contents of the invention

In view of the above defects or improvement needs of the prior art, the present invention provides an H-shaped vertical axis wind turbine energy buffering device, in which the specific structure and arrangement of its key components such as the energy buffering unit and the centrifugal speed regulating unit are Improvement research, while redesigning its overall structural layout in a targeted manner, can effectively improve the starting performance of the wind turbine while ensuring the stability of the wind turbine output power, so it is especially suitable for various H-shaped vertical axis wind turbines. Manufacturing and application situations.

In order to achieve the above object, according to one aspect of the present invention, an H-type vertical axis wind turbine energy buffering device is proposed, which is characterized in that it includes an energy buffering unit and a centrifugal speed regulating unit, wherein:

The energy buffering unit includes a slider that is fittedly mounted on the horizontal support rod and can slide left and right along the horizontal support rod. The slider is connected to the main shaft through a buffer spring;

The centrifugal speed regulating unit includes three sleeves that are externally placed on the main shaft, and from top to bottom along the main shaft are a fixed sleeve, a middle sleeve and a lower end sleeve, wherein the middle sleeve And the lower end sleeve can slide up and down along the main shaft with the expansion and contraction of the centrifugal spring; a collar with a heavy object is connected to the fixed sleeve and the lower end sleeve respectively through a connecting rod, and the collar passes through the The centrifugal spring is connected to the middle sleeve; a baffle connected to the collar is placed at the outer end of the slider and restricts the slider from sliding along the horizontal support rod in a direction away from the main axis; when the fan is started , the baffle avoids impact on the starting performance of the wind turbine by limiting the sliding of the slider. When the wind speed increases, the baffle rises above the slider, and the slider can slide freely to achieve energy buffering.

As a further preference, there are preferably two buffer springs.

As a further preference, the length of the connecting rod connecting the fixed sleeve and the lower end sleeve is the same, and the middle sleeve is located at an intermediate position between the fixed sleeve and the lower end sleeve.

As a further preference, the collar is composed of five small rings, of which the middlemost small ring is connected to the baffle, and the other four small rings are connected to the connecting rod. Relative rotation occurs when objects are axes.

As a further preference, the mass of the weight is smaller than the mass of the slider.

According to another aspect of the present invention, an H-type vertical axis wind turbine is provided, which is characterized in that the above-mentioned H-type vertical axis wind turbine energy buffering device is installed.

Generally speaking, compared with the existing technology, the above technical solution conceived by the present invention mainly has the following technical advantages:

1. By setting up an energy buffer unit and utilizing the mutual conversion of the angular momentum of the slider and the wind turbine, the present invention can reduce its impact on the rotational speed of the wind turbine under changing wind speed conditions and maintain the stability of the output power of the wind turbine;

2. In addition, the present invention can effectively prevent the slider from sliding during the startup of the wind turbine and affecting the startup performance of the wind turbine by providing a centrifugal speed regulating unit;

3. At the same time, the present invention only adds an energy buffer device on the side of the wind turbine, so it has the advantages of simple production, low cost and easy installation. It can be used for various types of H-shaped vertical axis wind turbines and has wide applicability.

Description of the drawings

Figure 1 is a front view of a three-blade H-type vertical axis wind turbine equipped with an H-type vertical axis wind turbine energy buffer device provided in an embodiment of the present invention;

Figure 2 is a left view of a three-blade H-type vertical axis wind turbine equipped with an H-type vertical axis wind turbine energy buffer device provided in the embodiment of the present invention;

Figure 3 is a top view of a three-blade H-type vertical axis wind turbine equipped with an H-type vertical axis wind turbine energy buffer device provided in the embodiment of the present invention;

Figure 4 is a three-view view of the energy buffer unit of the H-type vertical axis wind turbine energy buffer device constructed in accordance with the present invention. Figure 4a is a front view of the energy buffer unit, and Figure 4b is a left view of the energy buffer unit. 4c is a top view of the energy buffer unit;

Figure 5 is a front view of the centrifugal speed regulating unit of the H-shaped vertical axis wind turbine energy buffer device constructed in accordance with the present invention;

Figure 6 is a left view of the centrifugal speed regulating unit of the H-shaped vertical axis wind turbine energy buffer device constructed in accordance with the present invention;

Figure 7 is a top view of the centrifugal speed regulating unit of the H-type vertical axis wind turbine energy buffer device constructed in accordance with the present invention;

Figure 8 is a three-dimensional view of the centrifugal speed regulating weight of the H-type vertical axis wind turbine energy buffer device constructed in accordance with the present invention. Figure 8a is a front view of the weight, and Figure 8b is a left view of the weight. 8c is a top view of the weight.

Throughout the drawings, the same reference numbers refer to the same elements or structures, wherein:

1-fixed sleeve; 2-middle sleeve; 3-lower sleeve; 4-centrifugal spring; 5-connecting rod; 6-ring; 7-baffle; 8-centrifugal speed regulating weight; 9-horizontal support Rod; 10-spindle; 11-slider; 12-buffer spring; 13-blade.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

Figures 1, 2 and 3 are schematic structural diagrams of a three-blade H-type vertical axis wind turbine equipped with an H-type vertical axis wind turbine energy buffering device provided in the embodiment of the present invention. As shown in Figures 1, 2 and 3 shows that the H-shaped vertical axis wind turbine energy buffering device provided by the present invention is characterized by including an energy buffering unit and a centrifugal speed regulating unit, wherein:

The energy buffering unit includes a slider 11 that is mounted on the horizontal support rod 9 and can slide left and right along the horizontal support rod 9. The slider 11 is connected to the main shaft 10 through a buffer spring 12;

The centrifugal speed regulating unit includes three sleeves placed on the main shaft 10. From top to bottom along the main shaft 10, they are a fixed sleeve 1, a middle sleeve 2 and a lower end sleeve 3, wherein the The middle sleeve 2 and the lower sleeve 3 can slide up and down along the main shaft 10 with the expansion and contraction of the centrifugal spring 4; the collar 6 containing the weight 8 is connected to the fixed sleeve 1 and the fixed sleeve 1 through the connecting rod 5 respectively. The lower end sleeve 3 is connected, and the collar 6 is connected to the middle sleeve 2 through the centrifugal spring 4; the baffle 7 connected to the collar 6 is placed at the outer end of the slider 11 to limit the slider. 11 Slide along the horizontal support rod 9 in a direction away from the main axis 10;

Further, as shown in FIG. 4 , there are preferably two buffer springs 12 .

Further, as shown in Figure 5, the length of the connecting rod 5 connected to the fixed sleeve 1 and the lower sleeve 3 is the same, and the middle sleeve 2 is located between the fixed sleeve 1 and the lower sleeve 3 the middle position.

Further, as shown in Figures 5, 6 and 7, the collar 6 is composed of 5 small rings, of which the middlemost small ring is connected to the baffle 7, and the other four small rings are connected to the connecting plate. The rod 5 is connected, and the small ring can rotate relative to the weight 8 as an axis.

Further, the mass of the weight 8 is smaller than the mass of the slider 11, and the shape of the weight 8 is as shown in Figure 8a, Figure 8b and Figure 8c.

The working principle of the energy buffer unit is introduced in detail below:

One end of the horizontal support rod 9 is connected to the blade 13, and the other end is connected to the main shaft 10; when the wind speed is stable, the slider 11 is in a balanced position under the action of its own centrifugal force and the tension of the buffer spring 12; when the wind speed occurs When changing, the size of the centrifugal force of the slider 11 changes, and the slider 11 displaces under the action of its own centrifugal force and the tension of the buffer spring 12, realizing mutual conversion between the angular momentum of the slider and the angular momentum of the wind turbine. ; According to the law of conservation of angular momentum, when the wind speed increases, the centrifugal force increases, causing the slider 11 to move away from the main axis, and the angular momentum of the slider 11 increases, thereby inhibiting the increase in the wind turbine speed; when the wind speed decreases, the centrifugal force decreases, causing The slider 11 moves closer to the main axis, and the angular momentum of the slider 11 is reduced, thereby suppressing the decrease in the wind turbine speed; the wind turbine speed and output power are ensured through the mutual conversion of the angular momentum of the slider and the angular momentum of the wind turbine. stability.

The following describes the working principle of the centrifugal speed regulating unit in detail:

When the wind turbine is stationary, the centrifugal speed regulating unit and the slider 11 are in the initial position and the centrifugal spring 4 is at the initial length, and the baffle 7 is just vertically placed on the outer end of the slider 11; when the wind turbine is started , the baffle 7 restricts the slider 11 from sliding along the horizontal support rod in a direction away from the main axis 10 to prevent the energy buffer unit from affecting the starting performance of the wind turbine; when the wind turbine speed gradually increases, the centrifugal spring 4 is stretched by the centrifugal force of the weight 8 and drives the collar 6, the middle sleeve 2 and the lower sleeve 3 to rise; when the wind turbine reaches a certain rotation speed, the baffle 7 is higher than the slider 11 When , the energy buffering unit plays an energy buffering role.

It is easy for those skilled in the art to understand that the above descriptions are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements, etc., made within the spirit and principles of the present invention, All should be included in the protection scope of the present invention.

Claims (6)

1. An H-type vertical axis wind turbine energy buffering device, characterized in that it includes an energy buffering unit and a centrifugal speed regulating unit, wherein: The energy buffering unit includes a slider (11) that is mounted on a horizontal support rod (9) and can slide left and right along the horizontal support rod (9). The slider (11) passes through a buffer spring (12) Connected to the main axis (10) arranged in the vertical direction; The centrifugal speed regulating unit includes three sleeves that are externally placed on the main shaft (10), and from top to bottom along the main shaft (10) are a fixed sleeve (1) and a middle sleeve (2). ) and the lower end sleeve (3), wherein the middle sleeve (2) and the lower end sleeve (3) can slide up and down along the main shaft (10) with the expansion and contraction of the centrifugal spring (4); there are heavy objects The collar (6) of (8) is connected to the fixed sleeve (1) and the lower sleeve (3) respectively through the connecting rod (5), and the collar (6) passes through the centrifugal spring (4) It is connected with the middle sleeve (2); the baffle (7) connected with the collar (6) is placed on the outer end of the slider (11) and restricts the slider (11) to move along the horizontal direction. The support rod (9) slides away from the main axis (10). 2. The H-type vertical axis wind turbine energy buffer device according to claim 1, characterized in that there are two buffer springs (12). 3. The H-type vertical axis wind turbine energy buffering device according to claim 1 or 2, characterized in that the connecting rod (5) is connected with the fixed sleeve (1) and the lower end sleeve (3). The lengths are the same, and the middle sleeve (2) is located in the middle position of the fixed sleeve (1) and the lower sleeve (3). 4. The H-shaped vertical axis wind turbine energy buffer device according to claim 3, characterized in that the collar (6) is composed of five small rings, wherein the middlemost small ring is connected to the baffle (7). ) connection, and the other four small rings are connected with the connecting rod (5), and the small rings can rotate relative to the weight (8) as the axis. 5. The H-shaped vertical axis wind turbine energy buffering device according to claim 4, characterized in that the mass of the weight (8) is smaller than the mass of the slider (11). 6. An H-shaped vertical axis wind turbine, characterized in that the H-shaped vertical axis wind turbine energy buffer device according to any one of claims 1 to 5 is installed.