Low-wind-speed axial-flow breeze power generation hybrid system

Abstract

The utility model discloses a low-wind-speed axial-flow type breeze power generation hybrid system, which belongs to power generation equipment in the technical field of wind power generation equipment, and adopts the technical scheme that a wind collection tower is fixedly arranged on a main control tower support and comprises a large horn mouth assembly, a narrow pipe duct part and a small horn mouth which are sequentially communicated with one another; the narrow pipe duct part is provided with an axial flow type fan blade power generation device, the air inlet position of the narrow pipe duct part is provided with a high-pressure air leakage assembly, and the large horn mouth assembly is provided with a plurality of large horn mouth units which are evenly distributed in the horizontal circumferential direction. Air duct control assemblies are arranged in the multiple large horn mouth units; according to the low-wind-speed axial-flow type breeze power generation hybrid system, air is compressed to increase the wind speed through a double-horn narrow pipe structure of the Venturi principle, a disc type generator of an axial-flow type fan is connected to the duct position of the narrow pipe in series, and therefore the power generation efficiency is improved within a wider wind speed range.

Description

Technical Field

[0001] The utility model belongs to the technical field of wind power generation equipment, and particularly relates to a low-wind-speed axial-flow micro-wind power generation hybrid system. Background Art

[0002] In most regions generally, the wind speed at a height of more than ten meters above the ground is in the range of 1 to 4 m / s for most of the time, and such a wind speed cannot start a general wind turbine. The wind speed is slightly higher at the seaside and can reach 2 to 6 m / s for a relatively long time, and can reach more than 30 m / s during typhoons. The rated wind speed corresponding to the rated power of a general wind turbine is 11 to 14 m / s, and it is very difficult to have such a high wind speed at a low altitude of more than ten meters, so effective power generation cannot be achieved. In order to ensure power generation for most of the year to improve economic efficiency and meet the power supply needs of island users, it is necessary to make full use of the wind energy at a relatively low wind speed. Therefore, it is necessary to design and develop an efficient DC power generation system that can generate electricity at a relatively low wind speed, for example, start generating electricity at a wind speed of 1 m / s, achieve effective power generation at a wind speed of 3 to 4 m / s, and generate electricity at full power at a wind speed of 5 to 8 m / s, greatly increasing the annual power generation hours and economic efficiency. Design a sealed device that combines wind and compressed air to increase the wind speed by 4 to 10 times. For example, increasing the wind speed at the air inlet from 1 m / s to 4 to 10 m / s can effectively generate electricity and greatly improve the power generation efficiency of the generator.

[0003] When the wind speed is higher than 5 m / s, more power can be generated. After compression, the wind speed reaches more than 20 m / s, and the output of the generator reaches the order of hundreds of kW, such as 100 - 200 kW; when the wind speed reaches more than 10 m / s, after compression, the wind speed is increased to about 40 m / s, the rotor speed is higher, the power generation efficiency is also higher, and the power generation output may even reach 500 - 1000 kW.

[0004] The air compression device is a double-horn pipe that utilizes the Venturi principle to compress air and increase the wind speed. The wind speed is the highest at the throat of the pipe, which is the narrowest part between the two horns. There is a large dynamic air pressure at the cross-section of the narrow pipe culvert; the exhaust of the small horn forms a pressure smaller than that of the narrow pipe culvert, continuously sucking the air flow entering from the large horn through the culvert. This is the narrow pipe effect, that is, the Venturi effect.

[0005] In summary, fluid mechanics shows that air flow forms wind. In the downwind direction, the kinetic energy of the wind generates a wind pressure, which is proportional to the square of the wind speed. The higher the wind speed, the greater the wind pressure and the greater the energy of the wind. Therefore, the energy of low wind speed (gentle breeze) is relatively small and often cannot drive the blades of a wind turbine to rotate for power generation. Generally, a wind turbine requires a wind speed of more than 4 m / s to drive the blades to rotate, that is, to start. At this time, power generation is still not possible. A wind speed of more than 7 m / s is required for power generation, and full power generation can be achieved at a wind speed of 11 - 14 m / s. In fact, at a height of more than ten meters above the ground, the probability of a wind speed of 10 m / s is extremely low, only a few hours in a year. Only at the seaside or on high mountains can there be several hundred hours. Therefore, the economic efficiency is low.

[0006] In power islands such as islands, grasslands, deserts, border defense lines, and sparsely populated areas, a wind power generation system that can generate electricity day and night to replace the diesel power generation system is an extremely suitable means. It not only does not require fuel, reduces noise, and protects the environment, but also can save a large amount of operating expenses. Since electricity is needed all the time, a technology that can effectively generate electricity at low wind speeds is required. It can effectively generate electricity within the wind speed range of 2 - 25 m / s. In areas with slightly better conditions, the total number of hours reaches about 5000 hours. With energy storage, it can generate electricity independently to supply normal electricity to users.

[0007] Therefore, it is necessary to design a device or system that can capture wind energy resources in 360 degrees and still effectively generate electricity at low wind speeds, which can achieve high efficiency and wide application.

[0008] The device for increasing the wind speed is the above-mentioned double-horn structure, that is, using the Venturi principle to increase the wind speed. An axial-flow fan blade is placed in the throat of the pipe with the highest wind speed - the narrowest pipe culvert. The rotation of the fan blade drives the rotor to rotate for power generation, converting wind energy into electrical energy. Utility Model Content

[0009] The purpose of the present utility model is to provide a low-wind-speed axial-flow gentle breeze power generation hybrid system, which uses the method of increasing the wind pressure (pressure) to increase the wind speed, so as to increase the wind speed to a higher level in the case of gentle breeze, making it easier for the generator rotor to rotate. The higher the wind speed, the higher the rotor speed, the shorter the time for the winding to cut the magnetic field lines, and the higher the magnetic flux change rate, so a higher voltage can be induced and a larger amount of electricity can be generated. In vast areas with low wind speeds, the double-horn narrow pipe structure using the Venturi principle compresses air to increase the wind speed. A disk generator with an axial-flow fan is connected in series at the culvert position of the narrow pipe. The high-speed air flow drives the axial-flow fan to rotate, driving the generator rotor to rotate for power generation, thereby improving the power generation efficiency in a wider wind speed range.

[0010] The purpose of the present utility model is achieved as follows. A low-wind-speed axial-flow gentle breeze power generation hybrid system includes:

[0011] The main tower support is used for the support and installation of equipment;

[0012] The wind collecting tower is fixedly arranged on the main tower support. The wind collecting tower includes a large bell mouth assembly, a narrow pipe duct part and a small bell mouth which are connected in sequence; and

[0013] An axial flow fan blade power generation device is arranged in the narrow pipe duct part. A high-pressure air release component is arranged at the air inlet position of the narrow pipe duct part. The large bell mouth assembly is provided with a plurality of large bell mouth units which are evenly distributed in the horizontal circumferential direction. Air duct control components are arranged inside each of the plurality of large bell mouth units.

[0014] Furthermore, the bottoms of the plurality of large bell mouth units are convergently connected to form an air inlet convergence area, and the air inlet convergence area is placed at the front end of the high-pressure air release component along the air flow direction.

[0015] Furthermore, eight large bell mouth units are evenly distributed. The air inlets of the eight large bell mouth units are evenly distributed in the circumferential direction to form an octagonal air inlet pipe head, and an air inlet fence is arranged on any one of the air inlet pipes of the octagonal air inlet pipe head.

[0016] Furthermore, the air duct control component includes a thin plate hinged inside the large bell mouth unit, a top bar and a soft spring fixedly arranged inside the large bell mouth unit. One end of the soft spring is fixedly connected to the windward plate surface of the thin plate, and the other end of the soft spring is fixedly connected to the inside of the large bell mouth unit. The top bar is arranged inside the large bell mouth unit near the end face where the thin plate moves, and is used for the sealing arrangement between the end face of the thin plate and the inside of the large bell mouth unit.

[0017] Furthermore, the high-pressure air release component includes a plurality of high-pressure air release openings opened at the front end of the narrow pipe duct part and a cover plate assembly arranged at the positions of the high-pressure air release openings. The cover plate assembly includes a cover plate hinged to one side of the high-pressure air release opening at one end and a spring fixedly arranged on the windward surface of the cover plate, and the other end of the spring is fixedly connected to the other side of the high-pressure air release opening.

[0018] Furthermore, the axial flow fan blade power generation device includes a blade unit, a horizontal generator disc arranged on the rotating shaft of the blade unit, an intelligent controller, a DC / DC DC converter and a battery pack which are electrically connected to the horizontal generator disc. The output end of the battery pack is electrically connected to a high-power inverter, and the high-power inverter is electrically connected to the power grid.

[0019] Furthermore, the blade unit is a centerless shaft blade structure or a center shaft blade structure.

[0020] Further, the horizontal generator disc includes a stator, a first rotor disposed within the inner ring of the stator, and a second rotor disposed outside the outer ring of the stator. The upper end surfaces of the first rotor and the second rotor are fixedly connected, and the rotating end of the blade unit is fixedly connected to the fixed end surfaces of the first rotor and the second rotor.

[0021] Further, a sealing strip is provided at the position where the high-pressure air discharge port is in close contact with the cover plate assembly.

[0022] Further, a solar panel is provided on the outer top of the octagonal air inlet pipe head, and the solar panel is electrically connected to the intelligent controller.

[0023] The beneficial effects of the present utility model are embodied in:

[0024] 1. In the present utility model, a wind collecting tower with air intake and wind collecting functions is fixedly installed on the set main tower support, and a large bell mouth assembly, a narrow pipe culvert section, and a small bell mouth are arranged in the wind intake direction in the wind collecting tower. After the smaller wind speed is collected and passed through the wind collecting tower, a larger wind speed can be generated in the narrow pipe culvert section of the wind collecting tower, which is conducive to the power generation operation. More specifically, an axial flow fan blade power generation device is arranged in the narrow pipe culvert section, and the axial flow fan blade power generation device conducts wind power generation processing by pushing wind at a position with a larger wind speed. Among them, in order to achieve better power generation and adaptively control the wind power, a high-pressure air discharge assembly is arranged at the wind intake position of the narrow pipe culvert section. When the wind power is too large, an automatic air discharge operation is carried out in the narrow pipe culvert section, so that the wind power passing through the narrow pipe culvert section is within a range that can be normally operated to ensure the safety of the equipment during use. In addition, a plurality of the large bell mouth units are arranged in the horizontal circumferential direction to collect wind power in different directions as much as possible. And a wind duct control assembly is arranged inside the large bell mouth unit to avoid the problem of wind backflow between the plurality of arranged large bell mouth units.

[0025] 2. In the present utility model, by connecting the bottoms of the plurality of large bell mouth units in a converging manner, the converging operation of multiple wind directions is realized, and the air intake converging area is placed at the front end of the high-pressure air discharge assembly along the wind flow direction, so that the converged wind speed can be regulated before passing through the narrow pipe culvert.

[0026] 3. In the present utility model, eight large bell mouth units are evenly arranged, and the air inlet ends of the eight large bell mouth units are horizontally arranged back to back with each other, so that the wind collection tower can collect wind in any direction, thereby improving the effect and efficiency of wind collection. In addition, an air inlet grille is arranged at the air inlet end of the large bell mouth unit to prevent external birds or floating objects from entering the pipeline, avoiding blockage inside the pipeline, and thus greatly reducing the operation and maintenance difficulty and workload.

[0027] 4. In the present utility model, by arranging an air duct control component inside the large bell mouth unit, the reverse flow of air that may occur between multiple large bell mouth units can be effectively avoided. Specifically, a thin plate is installed at each air inlet and pulled by a relatively soft spring. The thin plate is inclined for air inlet. When static, the air inlet is half open. Once a large amount of wind enters other air inlets and blows into the air duct, part of the wind rebounds from the pipe wall. This force pushes the thin plate upward, and the thin plate reaches the top of the clamping strip and closes tightly, preventing the non-air inlet from leaking air.

[0028] 5. In the present utility model, since a high-pressure air release port is arranged in the high-pressure air release component, and the high-pressure air release port is arranged on the upper end surface of the narrow pipe culvert part, one end of the arranged cover plate is hinged to one side of the high-pressure air release port, and the other end of the cover plate is hinged to a spring on the other side of the high-pressure air release port. Thus, the arranged cover plate can perform air release treatment after opening when the wind passing through the narrow pipe culvert part is relatively large. When the wind speed is very high and the wind pressure is very large, the spring tension is not enough to hold the cover plate, and the cover plate will open for ventilation. The greater the wind, the greater the opening degree and the greater the discharged air flow.

[0029] 6. In the present utility model, by arranging corresponding blade units in the axial flow fan blade power generation device, power generation operation is performed on the horizontal generator disk through the blade units, and then power storage operation is performed under the control of an intelligent controller, a DC / DC DC converter, and a battery pack. And power supply to the outside is performed through a large-power inverter and the power grid, realizing stable power supply processing.

[0030] 7. In the present utility model, when the rotor is driven by the blades of the axial flow fan, the coil cuts the magnetic force lines, thereby inducing electromotive force and induced current. Since there are many blade-type coil windings, many strip-shaped rare earth permanent magnets are erected and installed on both sides of the coil windings. The width of the strip-shaped magnet itself is equivalent to the width of the blade-type winding coil. The time passing through each group of coil windings is very short. The magnetic bars of the tree-shaped permanent magnets rotate, resulting in a rapid change in magnetic field intensity. Under a certain cross-sectional area of the coil windings, the magnetic flux changes greatly. That is, in ΔΦ / Δt, Δt is small and ΔΦ is large, so ΔΦ / Δt is very large. Even when the rotational speed of the blades is relatively slow (for example, one revolution in 2 seconds), efficient power generation can still be achieved. That is, a large change in magnetic flux can be realized under a relatively small rotational speed, thereby achieving efficient power generation. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. In all the drawings, similar elements or parts are generally denoted by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0032] Figure 1 It is a schematic diagram of the overall structure of the power generation system of the present utility model;

[0033] Figure 2 It is a schematic top view of the octagonal air inlet pipe head of the present utility model;

[0034] Figure 3 It is a schematic diagram of the air inlet structure of a large bellmouth unit of the present utility model;

[0035] Figure 4 It is a schematic diagram of the internal structure of the large bellmouth assembly of the present utility model;

[0036] Figure 5 It is a schematic diagram of the internal structure of the high-pressure air release assembly of the present utility model;

[0037] Figure 6 It is a schematic top view of the structure of the high-pressure air release assembly of the present utility model;

[0038] Figure 7 It is a schematic diagram of the overall structure of the axial flow fan blade power generation device of the present utility model;

[0039] Figure 8 It is a schematic diagram of the internal structure of the horizontal generator disk of the present utility model;

[0040] Figure 9 It is a schematic diagram of the end structure of the small bellmouth of the present utility model;

[0041] Figure 10 It is a block diagram of the hybrid power generation system of the present utility model;

[0042] Figure 11 This is a schematic diagram of the flexible combination of the small cluster to the intelligent controller of the present utility model again.

[0043] In the attached drawings, 1 - main tower support, 2 - wind collecting tower, 3 - large bell mouth assembly, 4 - narrow pipe culvert section, 5 - small bell mouth, 6 - axial flow fan blade power generation device, 7 - high-pressure air release assembly, 8 - air duct control assembly, 9 - air inlet gathering area, 10 - octagonal air inlet pipe head, 11 - air inlet fence, 12 - thin plate, 13 - top strip, 14 - soft spring, 15 - high-pressure air release port, 16 - cover plate assembly, 17 - cover plate, 18 - spring, 19 - horizontal generator disk, 20 - intelligent controller, 21 - DC / DC DC converter, 22 - battery pack, 23 - high-power inverter, 24 - power grid, 25 - stator, 26 - first rotor, 27 - second rotor, 28 - sealing strip, 29 - solar panel, 30 - windward plate surface, 31 - large bell mouth unit, 32 - blade unit, 33 - lip, 34 - top sealing cover plate platform, 35 - bearing support, 36 - connecting rod, 37 - electrical cabinet, 38 - wire harness. Detailed implementation manners

[0044] Hereinafter, embodiments of the technical solutions of the present utility model will be described in detail with reference to the attached drawings. The following embodiments are only used to illustrate the technical solutions of the present utility model more clearly, and thus are only examples and cannot be used to limit the protection scope of the present utility model.

[0045] It should be noted that unless otherwise specified, the technical terms or scientific terms used in this application should have the ordinary meaning understood by those skilled in the art to which the present utility model belongs.

[0046] Referring to Figures 1 - 11 , a low-wind-speed axial-flow gentle wind power generation hybrid system includes:

[0047] The main tower support 1 is used for the support and installation of the equipment;

[0048] The wind collecting tower 2 is fixedly arranged on the main tower support 1. The wind collecting tower 2 includes a large bell mouth assembly 3, a narrow pipe culvert section 4 and a small bell mouth 5 which are sequentially connected and arranged; and

[0049] The narrow pipe culvert section 4 is provided with an axial flow fan blade power generation device 6. A high-pressure air release assembly 7 is arranged at the air inlet position of the narrow pipe culvert section 4. The large bell mouth assembly 3 is provided with a plurality of large bell mouth units 31 which are evenly distributed in the horizontal circumferential direction. A plurality of air duct control assemblies 8 are arranged inside the plurality of large bell mouth units 31.

[0050] By fixedly installing a wind collecting tower 2 with air inlet and air collecting functions on the set main tower support 1, and arranging a large bell mouth assembly 3, a narrow pipe duct part 4 and a small bell mouth 5 in the wind collecting tower 2 in the air inlet direction, it enables a smaller wind speed to be collected and passed through the wind collecting tower 2, and a larger wind speed can be generated in the narrow pipe duct part 4 of the wind collecting tower 2, thus facilitating the power generation operation; more specifically, an axial flow fan blade power generation device 6 is arranged in the narrow pipe duct part 4, and the axial flow fan blade power generation device 6 is used to push the wind force at a position with a larger wind speed for wind power generation processing; among them, in order to achieve better power generation and adaptively control the wind force, a high-pressure air release assembly 7 is arranged at the air inlet position of the narrow pipe duct part 4. When the wind force is too large, an automatic air release operation is carried out in the narrow pipe duct part 4, so that the wind force passing through the narrow pipe duct part 4 is within a range that can be normally operated to ensure the safety of the equipment during use. In addition, a plurality of large bell mouth units 31 are arranged in the horizontal circumferential direction to collect the wind force in different directions as much as possible; and, an air duct control assembly 8 is arranged inside the large bell mouth unit 31 to avoid the problem of wind force backflow between the arranged plurality of large bell mouth units 31.

[0051] The design of the wind collecting tower 2 has the following advantages: First, the low-speed gentle breeze passes through the pipe gorge effect, and the wind speed is increased by 4 to 10 times. The axial flow fan can push the engine rotor to rotate for power generation. Second, there is no external fan blade rotation, which is safe and quiet and very friendly to the environment. Third, it has strong typhoon resistance and will not cause damage to the tower frame in the case of typhoon, reducing natural disaster losses. Fourth, intelligent control equipment and storage batteries are placed on the main tower base to form a complete whole, which is convenient for management and maintenance.

[0052] Among them, the Venturi principle is: When gas or liquid flows inside a Venturi tube, at the narrowest part of the pipe, the dynamic pressure (the pressure of the air flow direction perpendicular cross-section) reaches the maximum value, and the static pressure (the pipe wall pressure) reaches the minimum value. The speed of the gas or liquid increases because the cross-sectional area of the flow-through section decreases.

[0053] Fluid mechanics shows that the total pressure of the air in the pipe is divided into two parts, namely dynamic pressure and static pressure. Dynamic pressure is the pressure generated when gas molecules move in a directional manner. The direction of the dynamic pressure is the same as the air flow direction, and its value is always positive, and its value is 0.5*ρ*v 2 ; where ρ is the air density (1.225 kg / m³ at normal temperature), and v is the air flow velocity (m / s). Static pressure is the vertical force exerted by the gas on the duct wall surface parallel to its air flow. It has equal acting forces in all directions in the pipe.

[0054] Dynamic pressure is the kinetic energy of fluid particles per unit volume. Dynamic pressure is actually one of the Bernoulli equations and can be derived from the conservation of energy of the fluid in motion. When air flows in a directed manner, it has kinetic energy, denoted by E (J / m 3 ), and the pressure presented by its kinetic energy is called dynamic pressure (or velocity pressure), denoted by h, with the unit Pa (Pascal). Numerically, they are all 0.5*ρ*v 2 .

[0055] Characteristics of the dynamic (pressure) of air in a pipeline: (1) Only air flowing in a directed manner presents dynamic pressure; (2) Dynamic pressure has a directionality and only exerts pressure on planes perpendicular or obliquely intersecting the flow direction. The dynamic pressure on the plane perpendicular to the flow direction is the largest, and the dynamic pressure on the plane (pipe wall) parallel to the flow direction is zero (only static pressure); the dynamic pressure on the fan blades in a narrow pipe culvert is the largest and is proportional to the square of the flow velocity v. (3) At the same flow cross-section, due to the unequal wind speeds at each point, their dynamic pressures are different. The throat diameter of the pipe gradually decreases in the rear section of the large horn, and the dynamic pressure and air flow velocity become larger and larger. At the narrowest narrow pipe culvert, the cross-sectional area is the smallest, the air flow velocity (wind speed) is the highest, and the dynamic pressure is the largest; (4) There is no distinction between absolute pressure and relative pressure for dynamic pressure, and it is always greater than zero.

[0056] It can be understood that in the narrowest narrow pipe culvert, the air flow velocity is the fastest and the dynamic pressure (the pressure perpendicular to the air flow direction) is the largest. An axial-flow fan of the generator disk is placed, and the high-speed air flow blows the blades of the axial-flow fan; when the air inlet is relatively high, the position of the large horn is relatively high, and the narrow pipe culvert is perpendicular to the ground, then the generator disk is placed parallel to the ground; if the air inlet is not very high, the large horn assembly 3 quickly reaches the ground, the narrow pipe culvert part 4 is parallel to the ground, and the horizontal generator disk 19 is perpendicular to the ground, that is, horizontally installed. The blade unit 32 in the narrow pipe culvert part 4 receives the high-speed air flow with large kinetic energy and blows the blade unit 32. Since the rotating end of the blade unit 32 is directly connected to the first rotor 26 and the second rotor 27 of the generator disk, the first rotor 26 and the second rotor 27 are driven to rotate and generate electricity.

[0057] As a preferred method of this embodiment, the length of the narrow pipe culvert part 4 does not need to be too long. A small section can be left at the front and rear of the generator disk placement, and a small section is 0.2 to 0.5 meters. A small horn is connected at the air outlet of the narrow pipe culvert part 4 so that the high-speed air flow is discharged, gradually reducing the air flow velocity. The wind speed at the final air outlet is not too high and will not cause environmental problems; the contraction angle of the large horn cone for air inlet is about 25 degrees, and the diameter gradually becomes smaller; the expansion angle of the small horn mouth 5 is about 15 degrees, and the wind speed of the exhaust gas becomes lower and lower. The wind speed drops to be equivalent to the environmental wind speed at the air outlet. Appropriate angles can be selected according to the environment.

[0058] Preferably, the bottoms of the plurality of large bellmouth units 31 are convergently connected to form an air inlet converging area 9, and the air inlet converging area 9 is placed at the front end of the high-pressure air discharge assembly 7 along the air flow direction.

[0059] By convergently connecting the bottoms of the plurality of large bellmouth units 31, the operation of converging multiple wind directions is realized. Moreover, by placing the air inlet converging area 9 at the front end of the high-pressure air discharge assembly 7 along the air flow direction, the converged wind speed can be regulated before passing through the narrow pipe culvert.

[0060] Preferably, eight large bellmouth units 31 are evenly arranged, and the air inlets of the eight large bellmouth units 31 are evenly arranged in the circumferential direction to form an octagonal air inlet pipe head 10, and an air inlet fence 11 is arranged on any air inlet pipe of the octagonal air inlet pipe head 10.

[0061] Eight large bellmouth units 31 are evenly arranged, and the air inlet ends of the eight large bellmouth units 31 are horizontally arranged back to back with each other, so that the wind can be collected in any direction by the wind collecting tower 2. The eight rectangles enclose an equilateral octagon because the rectangular structure is regular and easy to install. Thus, the effect and efficiency of wind collection are improved. In addition, an air inlet fence 11 is arranged at the air inlet end of the large bellmouth unit 31 to prevent external birds or floating objects from entering the pipeline, avoiding blockage inside the pipeline, and thus greatly reducing the operation and maintenance difficulty and workload.

[0062] As a preferred mode of this embodiment, the inner wall of the air inlet of the large bellmouth unit 31 is arc-shaped, so that the air flow blows in and flows down along the smooth inner wall with less reflection. The arc encloses a chrysanthemum-shaped space where rainwater accumulates. Therefore, generally a flat rainproof layer is covered on the top, and at the same time, a flat platform can be laid with photovoltaic panels for power generation.

[0063] It can be understood that the air inlet is a structure of eight rectangles. There are lips 33 at both the upper and lower parts, allowing more wind to smoothly enter the air inlet. The lips 33 are not too long, which is beneficial for air inlet and the structure is not too complex. At the same time, it is equivalent to slightly enlarging the area of the air inlet. Generally, at a certain time point, there is only wind coming from one direction and entering the two rectangular openings in this direction. The area of the rectangular opening is the side length of the octagon * height. The larger the area, the greater the air volume entering and the greater the total wind energy. After the air flow of the wind enters the pipeline and converges, the conical pipeline reaches the narrow pipe (throat). According to the Venturi principle, the wind speed at the narrowest position of this narrow pipe is the highest. An axial flow fan is placed here, and the high-speed air flow blows the fan blades to rotate rapidly. The higher the wind speed at the inlet, the higher the wind speed at the narrow pipe. The narrow pipe is a culvert. The wind speed of the culvert at the narrow pipe is directly related to the wind speed of the air inlet.

[0064] According to the principle of fluid mechanics, the wind pressure is proportional to the square of the wind speed. Assume that the total area of the two rectangular openings at the air inlet is 2S1 (the area of one opening is S1 = side length * height), and the cross-sectional area of the duct at the narrow pipe is a circular area S2. The area ratio N = 2S1 / S2 is the enhancement ratio of the dynamic air pressure. Therefore, the wind pressure of the circular cross-section of the duct at the narrow pipe is N times that of the air inlet. Since the pressure is proportional to the square of the wind speed, the relationship between the wind speed V1 at the air inlet and the wind speed V2 at the narrow pipe is V2 = V1 * N^(1 / 2), that is, the wind speed increase multiple is the square root of the area ratio.

[0065] Suppose the total area of the two rectangular air inlets is 160 square meters, the diameter at the narrow pipe is 2 meters, and the cross-sectional area is 3.14 square meters. The area ratio is 60.95. After taking the square root, it is 7.14 times. That is, when the wind speed at the air inlet is 1 m / s, after passing through the large horn to the narrow pipe, theoretically a wind speed of 7.14 m / s can be obtained. When the wind speed at the air inlet reaches 2 m / s, the wind speed at the narrow pipe reaches more than 14 m / s, and the axial flow fan type generator disk can generate electricity effectively.

[0066] When the wind speed at the air inlet reaches more than 10 m / s, the wind speed in the duct at the narrow pipe is very high, possibly more than 50 m / s. The dynamic pressure at the narrow pipe is very large, and the pressure on the conical tube wall with a gradually changing diameter is very large. The rotational speed of the generator axial flow fan is very high, which may cause the generator to be overloaded. Therefore, when the wind speed is very high and the wind pressure is very large, it is necessary to release the wind on the conical tube wall of the large horn before entering the narrow pipe to reduce the wind speed and wind pressure, thereby reducing the wind speed at the narrow pipe.

[0067] It can be understood that when eight air inlets converge into a cylindrical air duct, the problems of air inlet and airtightness need to be considered. Generally, at a certain time point, the eight air inlets mainly have wind coming from one direction, that is, two air inlets have air entering, and the other air inlets have almost no wind. Therefore, after the air enters, reflection occurs in the gradually narrowing air duct of the large horn, and the reflected air leaks out through the air inlets without wind, resulting in wind pressure loss and being not conducive to the full utilization of wind energy. Since only wind from one direction (mainly) enters at a certain time point, corresponding to two air inlets. The other air inlets do not enter wind or enter very little wind. For example, the two air inlets on the back of the wind direction definitely have no wind. At this time, when the wind enters the convergence point, it may be reflected and overflow from the air inlet without wind. Therefore, the wind flowing in the reverse direction pushes up the thin plate 12 and jams it on the top bar 13, sealing this air inlet without wind to prevent the wind from leaking out and ensuring that all the wind enters the narrow pipe to generate pressure to blow the fan blades to do work. When there is completely still wind, there is no wind at all air inlets, and the thin plate 12 hung by the soft spring 14 is in a semi-open state under gravity. When there is wind entering, the wind blows open the thin plate 12 and smoothly enters, almost reaching the fully open state; while the air inlets without wind are closed. In this way, the problem of wind energy loss caused by air leakage is solved. Therefore, it is necessary to set a duct control component 8 in the large horn unit 31.

[0068] Preferably, the air duct control assembly 8 includes a thin plate 12 hinged inside the large flared opening unit 31, a top strip 13, and a soft spring 14 fixedly arranged inside the large flared opening unit 31. One end of the soft spring 14 is fixedly connected to the windward plate surface 30 of the thin plate 12, and the other end of the soft spring 14 is fixedly connected to the inside of the large flared opening unit 31. The top strip 13 is arranged inside the large flared opening unit 31 near the end face where the thin plate 12 moves, for sealing the end face of the thin plate 12 and the inside of the large flared opening unit 31.

[0069] By arranging the air duct control assembly 8 inside the large flared opening unit 31, it is possible to effectively avoid the reverse flow of air that may occur between multiple large flared opening units 31. Specifically, a thin plate 12 is installed at each air inlet and pulled by a relatively soft spring 18. The thin plate 12 is inclined for air intake. When static, the air inlet is half-open. Once a relatively large amount of wind enters other air inlets and blows into the air duct, part of the wind rebounds from the pipe wall. This force pushes the thin plate 12 upwards, and the thin plate 12 reaches the top of the clamping strip and seals, preventing the unventilated opening from leaking air.

[0070] Under the pulling force of the soft spring 14, the weight of the thin plate 12 causes the thin plate 12 to be in a semi-open state. When there is a gentle breeze, it mostly opens, and when there is a strong wind, it fully opens, without affecting air intake. At the air intake convergence point, the diameter of the pipe gradually decreases, forming a large flared opening. When the diameter of the pipe gradually decreases, the pipe wall has some reflection effects on the wind, forming a certain reaction force, which may cause air leakage. At this time, the thin plate 12 is lifted upwards by the reflected wind and abuts against the top strip 13, closing the unventilated opening, so that there will be no air leakage. The flared air inlet has a relatively large wind pressure, which can open the thin plate 12 and allow air to enter smoothly. The large flared opening structure enables the highest wind speed and the largest wind pressure to be formed at the narrowest throat, pushing the blades of the axial flow fan to rotate and driving the rotor of the disk generator to rotate for power generation.

[0071] As a preferred embodiment of this example, there are eight air inlets. At one time point, usually one wind direction prevails. For the eight air inlets in the four directions of east, south, west, and north, two air inlets correspond to one direction. The total area of the two air inlets is dozens to more than one hundred square meters, or even larger. An axial flow fan generator disk is installed at the narrowest bottleneck, which is the narrow tube part. The diameter of the air duct is about 2 meters, and the diameter of the axial flow fan is also about 2 meters, that is, the radius is about 1 meter. The cross-section at the narrow tube part is a circle, and the cross-sectional area is about 3 square meters. If the total area of the two air inlets is 66 - 150 square meters, when reaching the narrowest part of the narrow tube, the area is compressed by 21 - 48 times, and the pressure is correspondingly increased by 21 - 48 times. The pressure is proportional to the square of the wind speed. In this way, the wind speed at the narrow tube part is the square root of 21 - 48 times that at the inlet, that is, the wind speed is increased by 4.6 - 6.9 times. For example, if the wind speed at the inlet reaches 1 m / s, at the narrowest part of the narrow tube, the wind speed reaches 4.6 - 6.9 m / s. Therefore, when the wind speed at the inlet reaches 1 m / s, it can drive the axial flow fan to rotate for power generation. At this time, the energy content of the wind is not very high. Therefore, the generator intelligent control system needs to connect a cluster of windings to the load, and when the wind increases, more clusters of windings are continuously connected to generate more electricity.

[0072] In order to ensure that the wind speed at the small horn-shaped air outlet is not too high, after the axial flow fan of the generator absorbs energy, the wind speed is greatly reduced. Still, a small horn-shaped opening is needed to further reduce the wind speed. The diameter of the circle at the maximum air outlet is more than 4 meters. In this way, the wind speed at the outlet is less than half of the wind speed at the rear end of the fan near the air outlet. If the wind speed after the wind drives the fan to rotate is 1 - 5 m / s, at the outlet of the small horn-shaped opening, it is 0.5 - 2.5 m / s, which will not harm the organisms near the air outlet.

[0073] Above the narrowest narrow tube, one to several high-pressure air discharge openings 15 are provided. The high-pressure air discharge opening 15 is provided with a rectangular cover plate 17. When the wind pressure is not very high, the cover plate 17 is pulled by the tension of the soft spring 14 to cover the air duct, and there is no discharged air. When the wind speed is very high and the wind pressure is very large, the tension of the soft spring 14 is not enough to hold the cover plate 17, and the cover plate 17 will open to discharge air. The greater the wind, the greater the opening degree, and the greater the discharged air flow.

[0074] Rain may blow into the air inlets and flow along the narrow tube until it reaches the air outlet. At the part of the axial flow fan close to the small horn-shaped opening at the rear end, there may be some gaps for part of the water to flow out, and the remaining rainwater reaches the outlet. The generator windings are vacuum impregnated with paint to prevent water and moisture. The permanent magnet magnetic steel is not affected by water vapor and can work normally.

[0075] Preferably, the high-pressure air release assembly 7 includes a plurality of high-pressure air release openings 15 formed at the front end of the narrow pipe duct portion 4 and a cover plate assembly 16 disposed at the positions of the high-pressure air release openings 15. The cover plate assembly 16 includes a cover plate 17 hinged to one side of the high-pressure air release opening 15 at one end and a spring 18 fixedly disposed on the windward surface of the cover plate 17. The other end of the spring 18 is fixedly connected to the other side of the high-pressure air release opening 15.

[0076] Since the high-pressure air release openings 15 are provided in the provided high-pressure air release assembly 7 and the high-pressure air release openings 15 are provided on the upper end surface of the narrow pipe duct portion 4, one end of the provided cover plate 17 is hinged to one side of the high-pressure air release opening 15, and the other end of the cover plate 17 is hinged to the spring 18 on the other side of the high-pressure air release opening 15. Thus, the provided cover plate 17 can perform air release treatment after being opened when the wind force passing through the narrow pipe duct portion 4 is relatively large. When the wind speed is very high and the wind pressure is very large, the pulling force of the spring 18 is not sufficient to hold the cover plate 17, and the cover plate 17 will open for ventilation. The greater the wind, the greater the opening degree, and the greater the discharged air flow.

[0077] Specifically, when the wind speed at the entrance reaches more than 10 m / s, the wind speed at the narrowest narrow pipe will reach 40 m / s or even more than 50 m / s. At this time, the wind pressure on the inclined pipe wall of the large trumpet-shaped air duct cone is very large. One or several openings are opened in front of the narrowest part for air release. A simple structure is a square arc-shaped cover with a hinge and several springs tightened. It remains airtight when the wind speed does not reach the opening wind speed (wind pressure), and when the opening pressure is reached, the spring tension is insufficient and the cover gradually opens. The higher the wind speed, the larger the opened opening, the more air is released, and the wind pressure reaching the generator blades (fans) will be reduced, so that the generator will not be overloaded. The number, layout, and elastic size of the springs all need to meet the wind speed and wind pressure conditions for opening and closing. Only need to open the air release window before the narrowest bottleneck for air release. The above is simply achieved by springs.

[0078] The air release opening is provided directly above the air duct, in a rectangular structure. In this way, the cover plate is a rectangular board, which does not require an arc, is convenient for processing, and has springs tightened on both sides. The springs are fixed outside the air duct. Only when the internal wind pressure of the air duct is greater than the pulling force of the springs will the cover plate open to discharge high-pressure air. The higher the internal wind pressure, the greater the opening degree of the cover plate. Therefore, the springs can adaptively open the cover plate to dynamically maintain a reasonable wind speed and wind pressure.

[0079] The wind speed distribution at the air inlet is very wide, with the wind speed ranging from 1 to 20 m / s. The situation of completely calm wind is extremely rare, and the time of typhoon with wind speed higher than 20 m / s is also very short. Due to the double-horn structure, the air is compressed at the narrowest part of the air duct, and the wind speed increases. The wind speed here is often around 20 m / s. When the wind speed at the air inlet reaches 10 m / s, the wind speed at the narrow part is above 40 m / s, and it is necessary to start exhausting air to relieve the wind pressure, appropriately reduce the wind pressure, and ensure the safe operation of the generator. The exhaust air outlet discharges upward to avoid high-pressure air flow from hurting approaching humans or animals. The tension of the spring needs to match the wind speed, wind pressure, and the power of the generator; the greater the rated power of the generator, the higher the pressure of the exhausted air can be set to make full use of the wind energy. The general principle is to maximize the utilization efficiency of wind resources while ensuring the safety of the generator. The exhaust (relief) outlets in front of the narrow part can be set with exhaust outlets with different multi-stage exhaust pressures, and the spring tensions of each stage are different, corresponding to the magnitudes of the wind speed and wind pressure respectively. For example, when the pressure in front of the narrow part reaches about 1 MPa, the first-stage relief plate is opened; when it reaches about 1.5 MPa, the first stage is opened to the maximum, and then the second one is opened (partially), and so on until all the relief outlets are opened.

[0080] Since the structure of the spring 18 is not very precise, the degree of opening of the relief plate ranges from half-open to fully open. The selection of the spring force of the spring 18 needs to be determined after debugging. Each relief plate goes through the same process. When the wind pressure is small, the tension of the spring 18 pulls the relief plate tightly, and the cover plate 17 presses on to keep the air flowing in the pipeline, ensuring the maximum and safe full utilization of wind energy. The disk generator with a fan system is inserted into the narrowest part of the narrow tube, which is equivalent to cutting open the narrow part and inserting a disk generator with a fan. The diameter of the disk generator is between 1 and 3 meters, and the corresponding maximum power output is from one hundred kilowatts to megawatt level, which is determined according to the local wind conditions and the top air inlet area.

[0081] As described above, when the wind speed at the inlet is very high and the wind pressure at the narrow part is very large, the exhaust outlet will automatically open to relieve the wind, appropriately reducing the wind speed and wind pressure at the narrow part. Several exhaust (relief) outlets can be set, and the spring forces are set in grades. The spring of the lowest grade has a smaller elasticity and is softer. When a certain wind pressure (such as corresponding to a wind speed of 10 m / s) is reached, the relief can be opened. The next level is when the wind pressure further rises, and the second exhaust (relief) outlet is opened, and so on until all the relief outlet baffles are opened. Each stage of the exhaust outlet gradually opens, expands, and reaches the maximum. After reaching the maximum opening, the wind pressure still continues to increase. When a higher wind speed and wind pressure threshold is reached, the second-stage exhaust outlet is opened; the number of designed relief outlets and the spring elasticity are adjusted according to the local wind resource situation to ensure maximum efficiency power generation and protect the safety of the generator.

[0082] Preferably, the axial-flow fan blade power generation device 6 includes a blade unit 32, a horizontal generator disk 19 disposed on the rotating shaft of the blade unit 32, and an intelligent controller 20, a DC / DC DC converter 21, and a battery pack 22 that are electrically connected to the horizontal generator disk 19. The output end of the battery pack 22 is electrically connected to a high-power inverter 23 and a power grid 24 that is electrically connected to the high-power inverter 23.

[0083] The purpose of setting the DC / DC DC converter 21 is to convert unstable direct current (DC) into direct current (DC) with a stable voltage for floating charge of the battery.

[0084] Install the axial-flow fan system at the narrowest part. The fan consists of several blades, which are fixed in a circle on the outer circumference, and the blades drive the outer circumference to rotate. In this way, the highest wind speed and wind pressure can be obtained at the narrowest throat, pushing the blades of the fan to rotate rapidly, thereby driving the rotor (rare earth permanent magnet steel ring) to rotate and inducing voltage and current in the stator (winding).

[0085] The outer circle of the axial-flow fan is directly connected to and drives the rotor, that is, the direct drive method. The higher the wind speed, the faster the axial-flow fan rotates, that is, the higher the rotor speed, the higher the magnetic flux change rate, and the greater the output power of the generator. The axial-flow fan generator disk is spliced in the throat, that is, one part of the large horn is connected to one side of the axial-flow generator disk, and the small horn (air outlet) part is connected to the other side of the axial-flow generator disk. The structure of the axial-flow fan is divided into two types: one is the structure without a central axis, and the shaftless pump push is this kind of structure; the other is the structure with a central axis.

[0086] Preferably, the blade unit 32 is a blade structure without a central axis or a blade structure with a central axis.

[0087] As a preferred mode of this embodiment, a blade structure with a central axis is adopted. Three brackets support the small bearing, and the blades are arranged (fixed) on the central axis. The edges of the blades are still fixed by a ring, and the rotor is connected to the outside of the ring. The rotor is a ring of two rows of magnetic steel strips, and a fixed stator 25 (blade-type winding ring) is held between the two rows of magnets to make a circular motion. That is, the stator 25 is a ring formed by a blade-type winding surrounded in a circle. When the rotor rotates, the stator 25 winding cuts the magnetic force line to induce voltage and current.

[0088] As a preferred mode of this embodiment, a central long shaft can be added to the axial-flow fan with a central axis. The long shaft extends from the axial-flow fan at the throat duct part 4 to outside the small horn mouth 5. The disk-type generator is installed and fixed outside the small horn mouth 5 (as long as it does not significantly obstruct the smooth flow of air), and the long shaft drives the disk-type generator to rotate and generate electricity.

[0089] The horizontal generator disk is installed by erecting the high-efficiency DC disk generator by 90 degrees. If the tower is very high and there is enough space to suspend the large horn device in the air, the generator disk can also be installed parallel to the ground, but the tail of the small horn is still placed on the ground, blowing the wind horizontally to prevent the ground from blocking the air outlet and causing poor air outlet.

[0090] The wind blade disk with a central axis, the axis is only used to fix the bearings at the root of the wind blades. At the fixed circumference, three support rods extend to the center of the circle, and small bearings can support the wind blade disk. Three support rods are required in both the front and back of the wind blades, which can be thinner, at the same angle and position, so that the side effect of blocking the wind is less. The number of blades is designed according to the wind speed, generally 3 - 10 blades. The edge of the wind blade is a circular entity, that is, the ends of the wind blades are connected together.

[0091] Calculation of the side length of the inscribed octagon in a circle with a diameter of 18 meters: If it is a circumscribed octagon, the central angle = 360° / 8 = 45°, and the side length of the octagon L = 1800 / 2×tan(45° / 2)×2 = 745.6 cm. The total length of the eight side lengths is 59.6 meters. When the height of the air outlet H = 12 meters, the area of one air outlet is 89.4 square meters. Whenever the wind comes from one of the four directions of east, south, west, and north, mainly two air outlets intake the wind, and the total intake area reaches 178.8 square meters. When the wind speed at the entrance reaches 4 m / s, assuming the diameter of the circular cross-section at the narrowest part of the venturi is 2 meters (radius 1 meter), then the compression ratio of the wind pressure A = 2S1 / S2 = 178.8 / 3.14 = 56.94. The wind pressure P is proportional to the square of the wind speed v: P∝v 2 。

[0092] Therefore, the multiple of the increase in wind speed at the narrowest part of the venturi In this way, when the wind speed at the air inlet is 4 m / s, the wind speed at the narrowest part of the venturi reaches more than 30 m / s, the generator rotates at a high speed, and after simulation, the power generation can reach more than one hundred kilowatts.

[0093] The above top area is about 250 square meters. Calculated according to an average of 100 - 120 W / square meter, about 25 - 30 kW of photovoltaic panels can be installed. If the scale is smaller, when the radius of the top circle is 5 meters, that is, the diameter is 10 meters, the top area is about 78 square meters, and about 10 kW of photovoltaic panels can be installed; the side length of the circumscribed octagon L = 1000 / 2×tan(45° / 2)×2 = 414.2 cm. When the height of the air outlet H = 8 meters, the area of one air outlet is 33.1 square meters. Whenever the wind comes from one of the four directions of east, south, west, and north, mainly two air outlets intake the wind, and the total intake area reaches 66 square meters. At this time, the compression ratio of the wind pressure A = 2S1 / S2 = 66 / 3.14 = 21, and the multiple of the increase in wind speed at the narrowest part of the venturi

[0094] By arranging corresponding blade units 32 in the axial-flow fan blade power generation device 6, and performing power generation operation on the horizontal generator disk 19 through the blade units 32, and then performing power storage operation under the control of the intelligent controller 20, the DC / DC DC converter 21 and the battery pack 22, and performing power supply processing to the outside through the arranged high-power inverter 23 and the power grid 24, a stable power supply processing is achieved.

[0095] Preferably, the horizontal generator disk 19 includes a stator 25, a first rotor 26 arranged on the inner ring of the stator 25, and a second rotor 27 arranged on the outer ring of the stator 25. The upper end surfaces of the first rotor 26 and the second rotor 27 are fixedly connected, and the rotating end of the blade unit 32 is fixedly connected to the fixed end surfaces of the first rotor 26 and the second rotor 27.

[0096] Furthermore, when the rotor is driven by the fan blade, the coil cuts the magnetic force line, thereby inducing electromotive force and induced current; since there are many blade-type coil windings, many strip-shaped rare earth permanent magnets are erected on both sides of the coil winding. The width of the strip magnet itself is equivalent to the width of the blade-type winding coil, and the time passing through each group of coil windings is very short. The magnetic strip of the tree-shaped permanent magnet rotates, and the magnetic intensity changes rapidly. Under a certain cross-sectional area of the coil winding, the magnetic flux changes greatly, that is, Δt in ΔΦ / Δt is smaller, ΔΦ is larger, and ΔΦ / Δt is very large. Even when the fan blade rotates relatively slowly (for example, one revolution in 2 seconds), effective power generation can still be achieved; a large change in magnetic flux can be realized under a relatively small rotational speed, thereby realizing efficient power generation.

[0097] As a preferred mode of this embodiment, when the diameter of the throat is about 2 meters and the diameter of the disk generator reaches 3 meters, that is, the diameter of the axial-flow fan is about 2 meters, the diameter of the stator is about 2.6 meters, and the circumference of the stator ring is about 2×3.14×1.3 = 8.1 meters. According to a winding width of 3 centimeters, the number of blade-type windings will reach 270. Leaving some gaps for heat dissipation, there are at least 240.

[0098] When the wind speed is very high and the rotational speed of the axial-flow fan is also very high, the time for the permanent magnet to pass through the blade-type winding is extremely short, the magnetic flux change rate is very large, and the induced voltage is very high, such as reaching 300 volts. At this time, if there are still many windings, such as ten in series, the DC voltage after series connection is as high as 3000 volts, exceeding the input voltage range of the DC / DC DC converter.

[0099] At this time, the number of windings in a cluster is reduced to 3 to form small clusters, and each small cluster outputs a pair of positive and negative wires; when there are 240 blade windings, 80 pairs of wires are output to the generator intelligent controller. Then, the intelligent controller conducts a series combination again. At this time, the cables of the wire harness are relatively thick, and different colored sleeves are used for the output of each small cluster for distinction, forming a regular square matrix on the circuit board of the intelligent controller for control and combination.

[0100] When the wind speed is low and the induced voltage of the windings is not very high, several small clusters are connected in series to form a normal cluster, and the DC voltage after series connection is below one thousand volts. When the wind speed is very high and the induced voltage of the windings is very high, the DC voltage of the small cluster formed by connecting 3 windings in series is already close to one thousand volts, and no secondary combination is performed. Each small cluster is directly connected in parallel and output to the DC / DC DC converter.

[0101] The wire harness output from the DC generator contains many wires to form a cable because the intelligent controller cannot be placed inside the generator. The temperature inside the generator can reach up to 55 °C or more, exceeding the safe operating range of chips such as the CPU, that is, the inside of the generator disk does not meet the requirements of the intelligent controller for a good working environment.

[0102] Whether the windings are connected in series in the generator disk to form a small cluster or the small clusters are connected in series again by the intelligent controller, it is necessary to follow the windings with evenly spaced physical positions to connect the load. Because according to Lenz's law, the windings connecting the load generate magnetic resistance (hysteresis) force, and the magnetic resistance forces are evenly distributed when the connected windings are evenly distributed physically, ensuring that the stator of the generator uniformly exerts force on the rotor and guaranteeing the stable operation of the generator.

[0103] As a preferred method of this embodiment: when the diameter of the disk generator reaches 3 meters, there are 240 blade windings (3 cm wide), and the rotational speed (angular velocity) reaches 10 revolutions per second, then the linear velocity is 10 * 2 * 3.14 * 1 m / s. The time passing through one winding is about 0.5 milliseconds, that is, the cutting time is 0.5 milliseconds. Simulation calculations show that when the magnetic field intensity B of the rare earth permanent magnet reaches 1.5 Tesla (T), when the number of turns is 60, each winding can induce a voltage of about 300 volts. Assuming the current reaches 10 amperes, the power of each winding reaches 3 kW. That is, a power of 240 * 3 = 720 kW can be obtained in strong wind conditions. At this time, heat dissipation is very important to prevent the temperature from being too high, causing the rare earth permanent magnet (magnet) to be far from the Curie temperature (the Curie temperature of the rare earth permanent magnet is between 320 - 380 °C, but the magnetic property will decrease when the working temperature reaches 80 °C. Therefore, a specification with a working limit temperature of 120 °C or even 150 °C or higher is selected). Because once the temperature is too high and close to the Curie temperature, the magnetic property of the permanent magnet will decrease or even demagnetize, and effective power generation cannot be achieved.

[0104] Due to the large space of the disk generator, and since the rotor and the rotating fan are not completely sealed, with a very small gap through which air with a relatively high velocity flows, the heat dissipation conditions are relatively good. The output power of each winding can reach 5 kW, and the total power output by the 240 blade-type windings of the entire generator can reach 1.2 MW. At this time, the temperature in the space will not exceed the working limit temperature of the permanent magnet (magnet steel), and the magnetism of the permanent magnet (magnet steel) is well maintained. When selecting the type, choose a specification with a Curie point temperature of the permanent magnet above 150 °C. Therefore, in an environment with good wind resources, the disk generator can generate a large amount of power.

[0105] Preferably, a sealing strip 28 is provided at the position where the high-pressure air discharge port 15 is in close contact with the cover plate assembly 16.

[0106] Preferably, a solar panel 29 is provided on the outer top of the octagonal air inlet pipe head 10, and the solar panel 29 is electrically connected to the intelligent controller 20.

[0107] In addition, a photovoltaic power generation system is installed on the top platform to form a hybrid power generation system with the axial-flow micro-wind power generation system, making full use of the space and increasing the power generation. During the day, the industrial power consumption is relatively large, and the wind power generation and photovoltaic power generation during the day can meet the relatively large power consumption demand. At night, the wind power generation continues to provide a stable power supply for the users' domestic electricity. On rainy and cloudy days, the photovoltaic power generation is less, but the wind is often strong, and the wind power generation is more. Balanced in this way, the output power is more stable. Adding photovoltaic panels on the top platform will increase the total power generation and improve the space utilization efficiency. The photovoltaic power generation power is a little smaller. The wind power generation power is much larger. When the wind is strong, it may be ten times or even dozens of times larger.

[0108] The power outputs of both power generations pass through a DC converter to output a stable DC voltage suitable for the floating charge of the storage battery. The two are connected to the storage battery through high-current diodes. The diode has a one-way conduction property. When any one of the two has no output, the current of the storage battery will not flow back. The inverter converts the DC power with a floating charge voltage (slightly higher than the rated voltage of the storage battery) into three-phase alternating current with the same frequency and phase as the power grid, connects to the power grid, and outputs electric energy to the power grid. When not connected to the power grid, it outputs three-phase alternating current of 50 Hz. When both the wind power generation and the photovoltaic power generation have no output, the storage battery supplies power to the inverter, and the inverter can still supply power to the power grid or users. It stops working only when the capacity of the storage battery is very low. A storage battery pack with a suitable capacity is set according to the demand.

[0109] Control the output of the inverter according to the battery capacity. When the battery power is only half of the rated capacity, the intelligent control device reduces the output power of the inverter. When the battery power is only 10% of the rated capacity, the inverter stops working. In actual operation, the intelligent controller manages the battery capacity, and the situation of the battery being discharged (close to 10% of the rated capacity) rarely occurs because there will not be no wind for a long time in wind power generation, and after choosing a suitable location, the situation where the wind speed is lower than 1 m / s will not occur for a long time.

[0110] The corresponding electrical components are arranged in the electrical cabinet 37. The electrical cabinet 37 is electrically connected to the axial-flow fan blade power generation device 6 through a conductive wire harness 38. Since the output power of wind power generation is relatively high, the battery capacity will also be configured to be relatively large, so as to smooth the fluctuations of wind power and photovoltaic power, and at the same time make the output power of the inverter relatively stable and output a stable high-quality power supply.

[0111] The working principle and process of the present utility model:

[0112] When the low-wind-speed axial-flow gentle wind power generation hybrid system provided by the present utility model is working, it uses the double-horn narrow pipe structure of the Venturi principle to compress air to increase the wind speed, so as to improve the power generation efficiency in a wider wind speed range; the octagonal grid structure with all-round wind reception, the air fluid enters the pipeline through the air inlets in all directions, and the pipeline shape is a structure with two trumpet mouths at both ends and a narrow pipe in the middle. The air inlet is a large trumpet mouth, the air outlet is a small trumpet mouth, and the pipeline between the large and small trumpets is a pipeline with a gradually changing diameter. The large trumpet for air inlet gradually narrows, the small trumpet for air outlet gradually widens, and there is a narrowest narrow pipe culvert in the middle. The large trumpet mouth gradually compresses the incoming air to increase the wind speed, and an air flow much higher than the inlet wind speed is formed at the narrowest narrow pipe, that is, the inlet wind speed is increased several times by using the Venturi principle; a disk generator of an axial-flow fan is connected in series at the culvert position of the narrow pipe, and the high-speed air flow drives the axial-flow fan to rotate, driving the generator rotor to rotate to generate electricity; the tower-type double trumpet structure that prevents the air flow from flowing back into the air inlet and the structure with a narrow pipe in the middle can efficiently utilize the energy of the air flow; a graded discharge air outlet is arranged in front of the narrow pipe, which can adapt to the working conditions from extremely low wind speed to extremely high wind speed in a wide area, and can generate electricity safely and efficiently at various wind speeds; there are no exposed wind blades, which is safe, quiet, extremely friendly to the environment, and has extremely strong typhoon resistance.

[0113] More specifically, by fixedly installing a wind collecting tower 2 with air intake and air collecting functions on the main tower support 1 provided, and arranging a large flared mouth assembly 3, a narrow pipe duct part 4 and a small flared mouth 5 in the wind inlet direction in the wind collecting tower 2, after the smaller wind speed is collected and passed through in the wind collecting tower 2, a larger wind speed can be generated in the narrow pipe duct part 4 in the wind collecting tower 2, thus facilitating the power generation operation. More specifically, an axial flow fan blade power generation device 6 is arranged in the narrow pipe duct part 4, and the axial flow fan blade power generation device 6 is used to push the wind force at the position with a larger wind speed for wind power generation treatment. Among them, in order to achieve better power generation and adaptively control the wind force, a high-pressure wind discharge assembly 7 is arranged at the wind inlet position of the narrow pipe duct part 4. When the wind force is too large, an automatic wind discharge operation is carried out in the narrow pipe duct part 4, so that the wind force passing through the narrow pipe duct part 4 is within a range that can be normally operated to ensure the safety of the equipment during use. In addition, a plurality of large flared mouth units 31 are arranged in the horizontal circumferential direction to collect the wind force in different directions as much as possible. And a wind duct control assembly 8 is arranged inside the large flared mouth unit 31 to avoid the problem of wind backflow between the plurality of arranged large flared mouth units 31.

[0114] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered by the scope of the claims and the description of the present invention.

Claims

1. A low-wind-speed axial-flow gentle-wind power generation hybrid system, characterized in that Comprising: A main tower support (1) for the support and installation of equipment; A wind collecting tower (2), the wind collecting tower (2) is fixedly arranged on the main tower support (1), and the wind collecting tower (2) includes a large bell mouth assembly (3), a narrow pipe duct part (4) and a small bell mouth (5) which are sequentially connected and arranged; and The narrow pipe duct part (4) is provided with an axial flow fan blade power generation device (6), a high-pressure air release component (7) is arranged at the air inlet position of the narrow pipe duct part (4), the large bell mouth assembly (3) is provided with a plurality of large bell mouth units (31) evenly distributed in the horizontal circumferential direction, and a duct control component (8) is arranged inside each of the plurality of large bell mouth units (31).

2. The low-wind-speed axial-flow breeze power generation hybrid system according to claim 1, wherein The bottoms of the plurality of large bell mouth units (31) are convergently connected and arranged to form an air inlet converging area (9), and the air inlet converging area (9) is placed at the front end of the high-pressure air release component (7) along the air flow direction.

3. The low-wind-speed axial-flow gentle-wind power generation hybrid system according to claim 1, wherein, There are eight large bell mouth units (31) evenly distributed, and the air inlets of the eight large bell mouth units (31) are evenly distributed in the circumferential direction to form an octagonal air inlet pipe head (10), and an air inlet fence (11) is arranged on any air inlet pipe of the octagonal air inlet pipe head (10).

4. The low-wind-speed axial-flow breeze power generation hybrid system according to claim 1, wherein The duct control component (8) includes a thin plate (12) hinged inside the large bell mouth unit (31), a top strip (13) and a soft spring (14) fixedly arranged inside the large bell mouth unit (31). One end of the soft spring (14) is fixedly connected to the windward plate surface (30) of the thin plate (12), and the other end of the soft spring (14) is fixedly connected to the inside of the large bell mouth unit (31). The top strip (13) is arranged inside the large bell mouth unit (31) near the end surface where the thin plate (12) moves, for the sealing arrangement of the end surface of the thin plate (12) and the inside of the large bell mouth unit (31).

5. The low-wind-speed axial-flow gentle-wind power generation hybrid system according to claim 1, characterized in that The high-pressure air release component (7) includes a plurality of high-pressure air release openings (15) opened at the front end of the narrow pipe duct part (4) and a cover plate assembly (16) arranged at the position of the high-pressure air release openings (15). The cover plate assembly (16) includes a cover plate (17) hinged to one side of the high-pressure air release opening (15) at one end and a spring (18) fixedly arranged on the windward surface of the cover plate (17), and the other end of the spring (18) is fixedly connected to the other side of the high-pressure air release opening (15).

6. The low-wind-speed axial-flow breeze power generation hybrid system according to claim 3, characterized in that The axial flow fan blade power generation device (6) includes a blade unit (32), a horizontal generator disk (19) arranged on the rotating shaft of the blade unit (32), an intelligent controller (20), a DC / DC DC converter (21) and a battery pack (22) electrically connected to the horizontal generator disk (19). A high-power inverter (23) electrically connected to the output end of the battery pack (22) and a power grid connection (24) electrically connected to the high-power inverter (23).

7. The low-wind-speed axial-flow breeze power generation hybrid system according to claim 6, wherein The blade unit (32) is a centerless shaft blade structure or a center shaft blade structure.

8. The low-wind-speed axial-flow breeze power generation hybrid system according to claim 6, wherein The horizontal generator disk (19) includes a stator (25), a first rotor (26) disposed within the inner ring of the stator (25), and a second rotor (27) disposed outside the outer ring of the stator (25). The upper end surfaces of the first rotor (26) and the second rotor (27) are fixedly connected, and the rotating end of the blade unit (32) is fixedly connected to the fixed end surfaces of the first rotor (26) and the second rotor (27).

9. The low-wind-speed axial-flow gentle-wind power generation hybrid system according to claim 5, wherein A sealing strip (28) is provided at a position where the high-pressure air discharge port (15) is in close contact with the cover plate assembly (16).

10. The low-wind-speed axial-flow gentle-wind power generation hybrid system according to claim 6, wherein A solar panel (29) is provided on the outer top of the octagonal air inlet pipe head (10), and the solar panel (29) is electrically connected to the intelligent controller (20).

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