CN221896732U - A wind turbine equipment combining lift and drag - Google Patents

Abstract

The embodiment of the utility model discloses a lift-drag combined wind turbine device, which relates to the technical field of wind power generation. The resistance-type wind turbine has the advantages of large starting torque and low starting wind speed, while the lift-type wind turbine has the advantage of high wind energy utilization coefficient. Therefore, the two types of wind turbines are combined to design a lift-drag combined wind turbine generator set that can not only start at low wind speeds, but also use the wake of the resistance generator to provide a suitable angle of attack for the lift-type wind turbine generator, thereby maximizing the development and utilization of wind energy. This lift-drag combined wind turbine is mainly suitable for auxiliary power generation at high altitudes in cities, or for use in complex terrain at low altitudes. The entire device is placed horizontally, that is, a horizontal-axis lift-drag combined wind turbine generator set.

Description

A wind turbine equipment combining lift and drag

Technical Field

The utility model relates to the technical field of wind power generation, in particular to a lift-drag combined wind turbine set device.

Background Art

Wind power generation equipment has a wide range of applications. It can not only be used in large-scale wind farms for large-scale power generation, but also be used in cities to provide electricity for public lighting systems. It can also be used in areas where power supply equipment cannot reach, such as power supply in remote mountainous areas, power supply for offshore drilling platforms, power supply for border outposts, etc.

The main form of wind power generation equipment is to equip wind turbines with different types of blades to generate different forces under the action of wind, and convert wind energy into the rotation of the wind wheel through the different sizes of each force. The wind wheel is connected to the generator through the main shaft, and the generator converts the mechanical energy of the wind wheel into electrical energy.

In addition to large wind turbines, the current wind power generation field also has a certain demand for small wind turbines. Small wind turbines need to have compact structures and maximize the utilization of wind energy. Therefore, the optimization of the rotor structure of small wind turbines has become a research direction.

Utility Model Content

The embodiment of the utility model provides a lift-drag combined wind turbine device, which realizes the combination of a resistance-type wind turbine and a lift-type wind turbine, so that it can be started at low wind speeds and can use the wake of the resistance generator to provide a suitable angle of attack for the lift-type wind turbine, thereby improving the utilization rate of wind energy.

In order to achieve the above object, the embodiment of the utility model adopts the following technical solution:

A resistance-type fan (2) and a lift-type fan (5) are installed in the wind-gathering housing (1); a motor box (4) is arranged between the resistance-type fan (2) and the lift-type fan (5), and a counter-rotating dual-rotor motor is installed in the motor box (4); one end of the motor box (4) is connected to the resistance-type fan (2), and the other end of the motor box (4) is connected to the lift-type fan (5); the diameter of one end of the motor box (4) connected to the resistance-type fan (2) is larger than that of the other end. Preferably, the motor box (4) is fixedly connected to the wind-gathering housing (1) by three load-bearing connecting rods (6), and the motor box (4) is semi-conical. Specifically, the front end of the motor box is consistent with the hub size of the resistance-type fan (2), and the rear end of the motor box is consistent with the hub size of the lift-type fan (5). This design enables the tail wind of the resistance-type fan to pass smoothly.

The resistance type fan (2) is connected to the outer rotor of the counter-rotating dual-rotor motor, and the lift type fan (5) is connected to the inner rotor of the counter-rotating dual-rotor motor; the resistance type fan (2) and the lift type fan (5) rotate in opposite directions. The two fans of different types are coaxially arranged front and back through a main shaft connection and are arranged in the wind gathering housing (1), with the resistance type fan (2) in front and the lift type fan (5) in the back. The two fans can cooperate with each other to perform secondary utilization of wind energy, thereby improving the utilization rate of wind energy.

Specifically, the diameter of the drum shaft (3) of the resistance-type fan (2) is the same as the diameter of one end of the motor box (4), and the lift-type fan (5) is installed at the other end of the motor box (4). The inner rotors of the counter-rotating twin-rotor motor are connected via a main shaft, wherein the motor shaft of the counter-rotating twin-rotor motor is fixedly connected to the inner rotor, one end of the main shaft is connected to the lift-type fan (5), and the other end is connected to the motor shaft via a coupling; the motor shaft is connected to the resistance-type fan (2). The impeller shaft of the resistance-type fan (2) is a hollow structure, and the main shaft passes through the impeller shaft of the resistance-type fan (2).

The utility model patent discloses an innovative lift-drag combined wind turbine device, belonging to the field of wind power generation technology. The drag-type wind turbine (2) has the advantages of large starting torque and low starting wind speed, while the lift-type wind turbine (5) has the advantage of high wind energy utilization coefficient. In order to complement the advantages of the two wind turbines, the two wind turbines are combined in this embodiment, so that they can be started at low wind speeds and the tail flow of the drag generator can be used to provide a suitable angle of attack for the lift-type wind turbine, thereby improving the wind energy utilization rate.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

FIG1 is a schematic diagram of the overall structure provided by an embodiment of the utility model;

FIG2 is a schematic structural diagram of a resistance-type fan (2) provided in an embodiment of the utility model;

FIG3 is a schematic diagram of the internal structure provided by an embodiment of the utility model;

FIG4 is a schematic structural diagram of a lift-type fan (5) provided in an embodiment of the utility model;

FIG5 is a schematic diagram of a possible series connection method provided by an embodiment of the utility model;

In the attached drawings: 1. Wind gathering casing; 2. Resistance type fan; 3. Drum shaft; 4. Motor box; 5. Lift type fan; 6. Load-bearing connecting rod.

DETAILED DESCRIPTION

In order to enable those skilled in the art to better understand the technical solution of the utility model, the utility model is further described in detail below in conjunction with the accompanying drawings and specific embodiments. The embodiments of the utility model will be described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the utility model, and cannot be interpreted as limiting the utility model. It can be understood by those skilled in the art that, unless specifically stated, the singular forms "one", "one", "said" and "the" used here may also include plural forms. It should be further understood that the wording "including" used in the specification of the utility model refers to the presence of the features, integers, steps, operations, elements and/or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and/or their groups. It should be understood that when we say that an element is "connected" or "coupled" to another element, it can be directly connected or coupled to other elements, or there may also be intermediate elements. In addition, the "connection" or "coupling" used here may include wireless connection or coupling. The wording "and/or" used herein includes any unit and all combinations of one or more associated listed items. It can be understood by those skilled in the art that, unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meaning as the general understanding of ordinary technicians in the field to which the utility model belongs. It should also be understood that those terms such as those defined in general dictionaries should be understood to have a meaning consistent with the meaning in the context of the prior art, and will not be interpreted with an idealized or overly formal meaning unless defined as here.

Researching a small wind turbine to supply power to these areas has become an important research topic. Horizontal axis wind turbines are the current mainstream wind turbines due to their high wind energy utilization coefficient and have been developed on a large scale. However, horizontal axis wind turbines still have some inherent disadvantages, such as: the horizontal axis wind turbine has a high starting wind speed, complex force conditions, and high fatigue strength requirements; in order to enable the horizontal axis wind turbine to adapt to wind from different wind directions, a yaw device must be installed inside the wind turbine, which makes the wind turbine have large noise pollution. Turbine wind turbines are developed after studying turbine rotors in the field of aerospace engineering. The wind turbine rotor consists of two spiral blades. This series of wind turbines has unique spiral blades that can ensure that the blades of the wind turbine always receive wind energy at the most appropriate angle. It is a special structural form, similar to the resistance type wind turbine in the form of a water turbine. It has the advantages of a resistance type wind turbine, such as a low starting wind speed, and as the area of the wind turbine rotor increases, the starting wind speed will also decrease accordingly. The starting wind speed of many large wind turbines can even reach 1m/s.

In order to make full use of the advantages of the two wind wheels and make up for the shortcomings of the wind wheels, the design purpose of this embodiment is to realize a lift-drag combined wind turbine, wherein, in order to utilize the wake of the drag-type wind turbine for secondary utilization of wind energy, in this embodiment, the two spiral blades of the drag-type wind turbine can be set to three blades, providing a suitable angle of attack for the lift-type wind turbine to improve the utilization rate of wind energy.

The utility model patent discloses an innovative lift-drag combined wind turbine device, belonging to the field of wind power generation technology. The drag-type wind turbine (2) has the advantages of large starting torque and low starting wind speed, while the lift-type wind turbine (5) has the advantage of high wind energy utilization coefficient. In order to complement the advantages of the two wind turbines, the two wind turbines are combined in this embodiment, so that they can be started at low wind speeds and the wake of the drag generator can be used to provide a suitable angle of attack for the lift-type wind turbine, thereby improving the wind energy utilization rate. This lift-drag combined wind turbine is mainly suitable for auxiliary power generation at high altitudes in cities, or for use in complex terrain at low altitudes.

The present invention provides a lift-drag combined wind turbine device, as shown in FIG1-4, comprising:

A resistance-type fan (2) and a lift-type fan (5) are installed in a wind-collecting housing (1); a motor box (4) is arranged between the resistance-type fan (2) and the lift-type fan (5), and a counter-rotating double-rotor motor is installed in the motor box (4); one end of the motor box (4) is connected to the resistance-type fan (2), and the other end of the motor box (4) is connected to the lift-type fan (5); the diameter of one end of the motor box (4) connected to the resistance-type fan (2) is larger than that of the other end; the front end of the motor box (4) is consistent with the hub size of the resistance-type fan (2), and the rear end of the motor box (4) is consistent with the hub size of the lift-type fan (5), and the motor box (4) is fixed to the inner wall of the wind-collecting housing (1). Preferably, the motor box (4) is fixedly connected to the wind-collecting housing (1) through three load-bearing connecting rods (6), and the motor box (4) is semi-conical. Specifically, the front end of the motor box is consistent in size with the hub of the resistance-type fan (2), and the rear end of the motor box is consistent in size with the hub of the lift-type fan (5). This design enables the wake wind of the resistance-type fan to pass smoothly.

In practical applications, complex winds are gathered through a wind-gathering shell, and the wind-gathering shell is in a gradually shrinking shape as a whole. According to the Bernoulli equation, the wind speed gradually increases as the wind passes through the wind-gathering shell. At the inlet of the wind-gathering shell is a three-bladed turbine resistance-type wind turbine. Due to the unique spiral blade design, its blades interact with each other and rotate due to resistance. The unique spiral structure can change the direction of the wind and flow along the flow channel of the resistance-type wind wheel, so that the wind is discharged in a certain regular pattern. According to the calculation of the wake of the resistance-type wind turbine, the lift-type wind turbine is adapted and designed, and a lift-type wind turbine suitable for the wake of the resistance-type wind turbine is designed. The resistance-type wake increases the appropriate angle of attack for the lift-type wind turbine.

The resistance type fan (2) and the lift type fan (5) are coaxially connected via a main shaft. The resistance type fan (2) is connected to the outer rotor of the counter-rotating dual-rotor motor, and the lift type fan (5) is connected to the inner rotor of the counter-rotating dual-rotor motor; the resistance type fan (2) and the lift type fan (5) rotate in opposite directions. In practical applications, two fans of different types are coaxially connected via a main shaft and arranged front and back in the wind gathering housing (1), with the resistance type fan (2) in front and the lift type fan (5) in the back. The two fans can cooperate with each other to reutilize wind energy, thereby improving the utilization rate of wind energy.

Specifically, the diameter of the drum shaft (3) of the resistance-type fan (2) is the same as the diameter of one end of the motor box (4), and the lift-type fan (5) is installed at the other end of the motor box (4). The inner rotors of the counter-rotating twin-rotor motors are connected by a main shaft, wherein the motor shaft of the counter-rotating twin-rotor motor is fixedly connected to the inner rotor, one end of the main shaft is connected to the lift-type fan (5), and the other end is connected to the motor shaft through a coupling; the motor shaft is connected to the resistance-type fan (2). Among them, the impeller shaft of the resistance-type fan (2) is a hollow structure, and the main shaft passes through the impeller shaft of the resistance-type fan (2). In the preferred embodiment, the motor box (4) is conical in shape, and this design can make the flow field smooth and reduce backflow. Increase wind energy utilization. For example, as shown in Figure 5, the resistance-type wind wheel, the resistance-type wind wheel transmission system, the counter-rotating dual-rotor motor, the overrunning clutch, the lift-type wind wheel transmission system, and the lift-type wind wheel can be connected in series on the main shaft in sequence, wherein the resistance-type wind wheel transmission system and the lift-type wind wheel transmission system both belong to the transmission system of the wind wheel, and can adopt the transmission system or transmission device products currently available on the market for the wind wheel; the overrunning clutch can also adopt the products currently available on the market.

It should be noted that the resistance-type fan (2) and the lift-type fan (5) described in this embodiment can be printed and manufactured using the currently available 3D printing technology, or can be produced using the currently available mold production technology after mold opening. The counter-rotating twin-rotor motor described in this embodiment can also use existing technology, such as the motor solution in invention patent: 201711248141.5.

The motor of this embodiment adopts a contra-rotating double-rotor motor, the resistance-type impeller is connected to the outer rotor of the contra-rotating double-rotor motor, the lift-type fan is connected to the inner rotor of the contra-rotating double-rotor motor, and the resistance-type fan and the lift-type fan are arranged to rotate in opposite directions. The motor box structure is consistent with the hub size of the two wind turbines and is in a cone shape, so as to ensure that the wind energy can smoothly pass through the flow channel in the wind gathering shell.

The resistance-type fan described in this embodiment adopts a conical structure, and the blades are spiral-shaped. The inner surface of the wind-collecting shell adopts a streamlined conical structure, and a yaw system is arranged inside, which can automatically adjust the opening direction according to the wind direction.

In this embodiment, the wind inlet direction is a resistance-type fan, a counter-rotating dual-rotor motor, and a lift-type fan, and the lift-type and resistance-type impellers are reversely arranged. The wind is firstly utilized by the resistance-type fan, and after the airflow is reversed and accelerated, the wind is utilized for the second time by the lift-type impeller, which greatly improves the utilization rate of wind energy.

In this embodiment, when the wind speed is relatively low, the resistance-type wind turbine generator starts, and can drive the lift-type wind turbine generator to rotate synchronously. At this time, the lift-type wind turbine is in a load state. During the rotation of the lift-type wind wheel, the tip speed ratio of the lift-type wind wheel blades is increased, thereby increasing the lift torque generated by the wind wheel. When the torque generated by the lift-type wind wheel can reach self-starting, the lift-type wind turbine is separated from the resistance-type wind turbine. At this time, the resistance-type wind turbine and the lift-type wind turbine rotate separately without interfering with each other. Due to the effect of the wind-gathering shell and the limit speed limit of the wind turbine, this limit speed will cause damage to the lift-type wind turbine. Therefore, when the wind speed is too high, the resistance-type wind turbine and the lift-type wind turbine are combined again to protect the wind turbine from being damaged. At this time, the rotation speeds of the two are stable, and the resistance-type wind turbine just provides the lift-type wind turbine with a perfect angle of attack wake wind direction. At this time, both achieve optimal power generation efficiency.

Compared with the prior art, the advantages of this embodiment are: the designed counter-rotating twin-rotor motor box is conical and has a streamlined surface, which allows airflow to pass smoothly. The start of the resistance-type fan can drive the lift-type fan to rotate, and when the wind speed that starts the lift-type fan is reached, the two separate. The lift-type fan continues to rotate, and at this time the resistance-type fan and the lift-type fan rotate separately without interfering with each other. Due to the effect of the wind-gathering shell and the maximum speed limit of the wind turbine, this maximum speed will cause damage to the lift-type fan. Therefore, when the wind speed is too high, the resistance-type fan and the lift-type fan are combined again to protect the wind turbine from being damaged. At this time, the rotation speeds of the two are stable and the resistance-type fan just provides the lift-type fan with a perfect angle of attack wake wind direction. At this time, both achieve optimal power generation efficiency.

Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the device embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment. The above is only a specific implementation method of the utility model, but the protection scope of the utility model is not limited to this. Any changes or replacements that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the utility model should be covered within the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims (8)

1. A lift-drag combined wind turbine device, characterized by comprising: A resistance-type fan (2) and a lift-type fan (5) are installed in the wind-collecting housing (1); A motor box (4) is arranged between the resistance-type fan (2) and the lift-type fan (5), and a counter-rotating dual-rotor motor is installed in the motor box (4); One end of the motor box (4) is connected to the resistance type fan (2), and the other end of the motor box (4) is connected to the lift type fan (5); One end of the motor box (4) connected to the resistance-type fan (2) has a larger diameter than the other end; the front end of the motor box (4) is consistent with the hub size of the resistance-type fan (2); the rear end of the motor box (4) is consistent with the hub size of the lift-type fan (5); and the motor box (4) is fixed as a whole to the inner wall of the wind-collecting outer shell (1). 2. The lift-drag combined wind turbine equipment according to claim 1, characterized in that the drag-type wind turbine (2) and the lift-type wind turbine (5) are coaxially connected through a main shaft. 3. The lift-drag combined wind turbine equipment according to claim 1 is characterized in that the resistance-type fan (2) is connected to the outer rotor of the counter-rotating twin-rotor motor, the lift-type fan (5) is connected to the inner rotor of the counter-rotating twin-rotor motor, and the resistance-type fan (2) and the lift-type fan (5) rotate in opposite directions. 4. The lift-drag combined wind turbine equipment according to claim 1 is characterized in that the motor box (4) is fixedly connected to the wind gathering outer shell (1) through three load-bearing connecting rods (6). 5. The lift-drag combined wind turbine equipment according to claim 1, characterized in that the motor box (4) is conical in shape. 6. The lift-drag combined wind turbine equipment according to claim 1 is characterized in that the diameter of the hub of the resistance-type fan (2) is the same as the diameter of one end of the motor box (4), and the lift-type fan (5) is installed at the other end of the motor box (4). 7. The lift-drag combined wind turbine equipment according to claim 1 or 6 is characterized in that the inner rotors of the counter-rotating twin-rotor motors are connected via a main shaft, wherein the motor shaft of the counter-rotating twin-rotor motor is fixedly connected to the inner rotor, one end of the main shaft is connected to the lift-type fan (5), and the other end is connected to the motor shaft via a coupling, and the motor shaft is connected to the resistance-type fan (2). 8. The lift-drag combined wind turbine equipment according to claim 7, characterized in that the impeller shaft of the resistance-type wind turbine (2) is a hollow structure, and the main shaft passes through the impeller shaft of the resistance-type wind turbine (2).