All-circumferential wind gathering device

Abstract

A full-circumferential wind gathering device comprises a wind gathering structure, a Venturi tube acceleration structure and a wind blocking structure. The air collecting structure comprises a body, a plurality of upper-stage guide vanes and a plurality of lower-stage guide vanes, the upper-stage guide vanes and the lower-stage guide vanes are arranged on the body and arranged in a staggered mode, the lower end of the body is connected with the upper end of the Venturi tube acceleration structure, and the air blocking structure is fixed to the lower end of the Venturi tube acceleration structure. Wind is blown from the direction parallel to the ground, captured by the upper blades and guided into channels between the upper blades on the windward side, after airflow enters the channels, the speed is gradually decreased, airflow kinetic energy is converted into pressure energy, and the pressure energy is gathered and compressed at the arc-shaped concave position of the inner taper pipe to form an inlet high-pressure area. According to the two-stage staggered type inlet guide vane structure and the layout optimization method thereof, two-stage staggered type key improvement is conducted on the inlet guide vane structure, adaptive adjustment is conducted on the overall structure layout of the inlet guide vane structure, all-circumferential incoming flow convergence is achieved, and the wind gathering acceleration effect of the device is improved.

Description

Technical Field

[0001] The present invention relates to the field of wind energy utilization, and particularly to a circumferential wind-gathering device. Background Art

[0002] Overhead power transmission and distribution lines are important infrastructure in the power network system. To ensure their safe operation, a large number of wireless sensors need to be arranged to monitor the operating environment and safety conditions of the power transmission and distribution lines. Since overhead lines are mainly distributed in remote areas such as the countryside and mountains, relying on external power sources or regularly replaced batteries to power wireless sensors will greatly increase the maintenance difficulty and usage cost of wireless sensors. In the prior art, there have been solutions to power wireless monitoring sensors by collecting wind energy in the environment.

[0003] In order to collect wind energy in the environment, large wind energy collectors and small wind energy collectors are often used at present. Among them, the wind-gathering device of the large wind energy collector is too large in volume relative to the microelectronic devices of the sensor, and mainly has a unidirectional wind-gathering structure that can only capture wind energy from a specific direction, and the structure designed for the rotating blades also has problems such as high mechanical failure rate, and it is difficult to adapt to the sensor power supply work under complex power grid environmental factors. The wind-gathering device of the small wind energy collector mainly works in a low-speed wind field environment. The characteristics of low environmental wind speed and frequent wind direction changes lead to problems such as difficult low-speed startup and unstable power generation power of the small wind energy collector, and it is difficult to meet the stable power supply requirements of wireless sensors.

[0004] Therefore, how to solve the problems of difficult low-speed startup and unstable power generation power of small wind energy collectors is an urgent problem to be solved by those skilled in the field of wind energy utilization. Summary of the Invention

[0005] In order to solve the problems of difficult low-speed startup and unstable power generation power of small wind energy collectors in the prior art, the present invention provides a circumferential wind-gathering device, including: a wind-collecting structure, a Venturi tube acceleration structure, and a wind-blocking structure;

[0006] The wind-collecting structure includes: a body, a plurality of upper guide vanes, and a plurality of lower guide vanes. Each of the upper guide vanes and each of the lower guide vanes are respectively arranged on the body. The upper guide vanes and the lower guide vanes are arranged in an interlaced manner, and the lower end of the body is connected to the upper end of the Venturi tube acceleration structure. The wind-blocking structure is fixed to the lower end of the Venturi tube acceleration structure.

[0007] Preferably, the lower edge of the upper guide vane and the upper edge of the lower guide vane are at the same horizontal height.

[0008] Preferably, the body includes: an inner conical tube with an opening facing any direction and an outer conical tube arranged at the lower end of the inner conical tube;

[0009] The upper guide vanes are embedded on the outer side of the inner conical tube, the lower guide vanes are embedded on the inner side of the outer conical tube, the lower guide vanes are embedded on the outer side of the inner conical tube, the upper guide vanes are connected to the outer conical tube, the lower end of the outer conical tube is connected to the upper end of the Venturi tube acceleration structure, and the upper guide vanes are located on the side far from the Venturi tube acceleration structure, while the lower guide vanes are located on the side close to the Venturi tube acceleration structure.

[0010] Preferably, an air inlet is formed between any two adjacent upper guide vanes and the inner conical tube.

[0011] Preferably, the bottom end of the inner conical tube is a closed structure.

[0012] Preferably, the deflection angle between the upper guide vanes and the lower guide vanes and the magnification of the intake air flow satisfy the formula: where θ is the deflection angle, γ is the circumferential uniform distribution angle, Q0 is the intake air flow corresponding to no deflection (deflection angle is 0) of the lower guide vanes, Q θ is the intake air flow corresponding to the deflection angle of θ, and k is the proportionality coefficient.

[0013] Preferably, the deflection angle between the upper guide vanes and the lower guide vanes and the magnification of the average throat wind speed satisfy the formula: where θ is the deflection angle, γ is the circumferential uniform distribution angle, v c is the ambient incoming flow wind speed, v θ is the average throat wind speed corresponding to the deflection angle of θ, and a, b, c, and d are empirical coefficients.

[0014] Preferably, there is a deflection angle between the upper guide vanes and the lower guide vanes in the circumferential direction.

[0015] Preferably, the deflection angle between the upper guide vanes (11) and the lower guide vanes (21) is half of the circumferential uniform distribution angle of the blades.

[0016] Preferably, the number of blades of the upper guide vanes and the lower guide vanes is the same.

[0017] Preferably, the blades are evenly arranged.

[0018] Preferably, the Venturi tube acceleration structure includes: a contraction tube section smoothly connected to the outer conical tube, a throat tube section smoothly connected to the contraction tube section, and a diffuser tube section smoothly connected to the throat tube section;

[0019] The upper end of the diffuser tube section is connected to the upper end of the wind blocking structure.

[0020] Preferably, the wind blocking structure includes: a wind blocking cover surrounding the outer periphery of the diffuser tube section and a closed top cover;

[0021] The windshield is connected to the outer periphery of the closed top cover.

[0022] Preferably, a generator is provided in the throat pipe section.

[0023] Preferably, the throat pipe section is a straight pipe or an arc pipe.

[0024] Preferably, the diameter of the windshield is 1.2 to 4 times the outlet diameter of the diffuser section.

[0025] Preferably, the height of the windshield is 0.3 to 1.5 times its diameter.

[0026] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0027] The present invention provides a full circumferential wind gathering device, including: a wind gathering structure, a Venturi tube acceleration structure, and a wind shielding structure; a main body, a plurality of upper guide vanes, and a plurality of lower guide vanes. Each of the upper guide vanes and each of the lower guide vanes are respectively arranged on the main body. The upper guide vanes and the lower guide vanes are arranged in an interlaced manner. The lower end of the main body is connected to the upper end of the Venturi tube acceleration structure, and the wind shielding structure is fixed to the lower end of the Venturi tube acceleration structure. Wind is introduced into the Venturi tube acceleration structure through the upper guide vanes of the wind gathering structure, and is accelerated through the narrow pipeline of the Venturi tube acceleration structure. The wind shielding structure can block the oncoming wind from the outside and form a negative pressure area inside, generating a negative pressure suction effect on the airflow in the tube, further increasing the flow rate of the throat pipe section.

[0028] The present invention has good adaptability to wind fields with frequently changing wind directions. The wind gathering structure can simultaneously collect horizontal incoming wind in all circumferential directions. The wind shielding structure blocks the environmental wind and forms a negative pressure at the outlet, which is not affected by wind direction changes. The cooperation of these two structures can not only achieve incoming wind in all circumferential directions, but also ensure good wind gathering and acceleration effects under different wind directions. At the same time, the present invention is not only applicable to low-speed wind fields, providing wind energy density that meets the power generation requirements for small wind energy collectors, but also can be used in conventional wind fields, enabling conventional wind turbines to obtain higher power generation under the same wind speed conditions, and improving the utilization rate of wind energy resources.

[0029] The full circumferential wind gathering device provided by the present invention can capture wind energy from all directions and is not restricted by wind direction changes. This structure enables the device to have better adaptability in complex and changeable wind field environments and can make full use of wind energy from all directions. In mountainous or rural areas, the wind direction may change frequently. The full circumferential wind gathering device can continuously and efficiently capture wind energy without worrying about the decrease in wind energy capture efficiency caused by wind direction changes. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the overall structure of the full circumferential wind gathering device of the present invention;

[0031] Figure 2 Schematic diagram of the wind collecting structure and Venturi tube acceleration structure of the present invention;

[0032] Figure 3 Partial schematic diagram of the Venturi tube acceleration structure and wind shielding structure of the present invention;

[0033] 1 - Wind collecting structure; 2 - Venturi tube acceleration structure; 3 - Wind shielding structure; 11 - Upper guide vane; 12 - Inner conical tube; 13 - Sealing structure; 21 - Lower guide vane; 22 - Outer conical tube; 23 - Contraction pipe section; 24 - Throat pipe section; 25 - Diverging pipe section; 31 - Windshield; 32 - Sealing top cover. Detailed implementation manners

[0034] To better understand the present invention, the content of the present invention will be further described below in conjunction with the specification drawings and examples.

[0035] As Figures 1-3 shown, a full - circumferential wind - gathering device includes: a wind collecting structure 1, a Venturi tube acceleration structure 2, and a wind shielding structure 3;

[0036] The wind collecting structure 1 includes: a main body, a plurality of upper guide vanes 11 and a plurality of lower guide vanes 21. Each upper guide vane 11 and each lower guide vane 21 are respectively arranged on the main body. The upper guide vanes 11 and the lower guide vanes 21 are arranged in an interlaced manner. And the lower end of the main body is connected to the upper end of the Venturi tube acceleration structure 2, and the wind shielding structure 3 is fixed to the lower end of the Venturi tube acceleration structure 2.

[0037] The upper guide vane 11 includes a plurality of longitudinal blades, which are evenly distributed circumferentially along the outer side of the inner conical tube 12. Its cross - section is a streamlined airfoil shape, with a circular - arc leading edge and a gradually tapering trailing edge to reduce air - flow separation and turbulence. The root of the upper guide vane 11 is fixed to the outer wall of the inner conical tube 12, and the tip extends outward into the sandwich cavity between the outer conical tube 22 and the inner conical tube 12.

[0038] The lower guide vane 21 includes a plurality of longitudinal blades, which are evenly distributed circumferentially along the inner side of the outer conical tube 22, and its shape is symmetrical to that of the upper guide vane 11. Its root is fixed to the inner wall of the outer conical tube 22, and the tip extends inward to the center of the sandwich cavity and converges with the tips of adjacent lower guide vanes 21 to form a regular channel.

[0039] The roots of the upper guide vanes 11 are fixed to the outer wall of the inner conical tube 12 and are evenly distributed circumferentially. The outer wall of the inner conical tube 12 is provided with grooves or mounting seats to ensure a smooth transition between the upper guide vanes 11 and the pipe wall and avoid air - flow disturbance.

[0040] The roots of the lower guide vanes 21 are fixed to the inner wall of the outer conical tube 22 in the same way. The inner wall of the outer conical tube 22 is designed as a curved surface matching the shape of the lower guide vanes 21 to ensure smooth air - flow passage.

[0041] The inner conical tube 12 and the outer conical tube 22 are arranged parallel to the vertical axis, and an annular interlayer channel is formed therebetween. The bottom end of the inner conical tube 12 is sealed by an arc-shaped closed structure 13 and is connected to the upper part of the lower guide vane 21; the lower end of the outer conical tube 22 is smoothly transitioned to the converging tube section 23 of the Venturi tube acceleration structure 2, and a tangent arc design is adopted at the connection to ensure that there is no sudden change in the air flow.

[0042] The lower edge of the upper guide vane 11 and the upper edge of the lower guide vane 21 are at the same horizontal height. In the present invention, a lower guide vane 21 is added on the basis of a conventional single-stage guide vane, which can not only divert the high-pressure air in the windward channel to the two side channels to relieve the import blockage phenomenon, but also pre-mix and comb the air flow in the lower guide vane 21 channel and converge it into a regular air current, effectively improving the air intake state of the Venturi tube acceleration structure 2, thereby greatly increasing the flow velocity at the throat tube section 24.

[0043] As Figure 2 shown, the wind converges into the Venturi tube acceleration structure 2 through the outer wall of the inner conical tube 12 and the surface of the upper guide vane 11, which can effectively guide and rectify the air flow, reduce the turbulence and resistance of the air flow, and make the air flow enter the Venturi tube acceleration structure 2 more smoothly. The upper guide vane 11 can evenly distribute the incoming air flow into each channel, avoiding the collision and turbulence of the air flow when entering the inner conical tube 12, thereby improving the flow efficiency of the air flow.

[0044] The main body includes: an inner conical tube 12 with an opening facing any direction and an outer conical tube 22 arranged at the lower end of the inner conical tube;

[0045] The upper guide vane 11 is embedded on the outside of the inner conical tube 12, the lower guide vane 21 is embedded on the inside of the outer conical tube 22, the lower guide vane 21 is embedded on the outside of the inner conical tube 12, the upper guide vane 11 is connected to the outer conical tube 22, the lower end of the outer conical tube 22 is connected to the upper end of the Venturi tube acceleration structure 2, and the upper guide vane 11 is located on the side far from the Venturi tube acceleration structure 2, and the lower guide vane 21 is located on the side close to the Venturi tube acceleration structure 2; an air inlet is formed between any two adjacent upper guide vanes 11 and the inner conical tube 12.

[0046] As Figure 3 shown, the inlet air collecting structure 1 captures and collects the low-speed incoming wind from all directions and guides and converges it into the vertical Venturi tube acceleration structure 2, and uses the Venturi effect to increase the air flow velocity. The outlet wind blocking structure 3 prevents the environmental wind from flowing back, and uses the outlet negative pressure generated by the external flow wind to aspirate and accelerate the throat tube section 24, so that the wind energy density of the throat tube section 24 reaches the maximum for the installed wind energy collector to generate electricity.

[0047] The inner conical tube 12 and the outer conical tube 22 are arranged parallel to each other in the vertical direction. The interlayer therebetween forms a full circumferential air inlet channel, which is separated into multiple inter-blade air inlet channels by two levels of longitudinally staggered guide vanes. The longitudinally staggered guide vanes are evenly arranged in the circumferential direction. The staggered guide vanes are composed of the same number of upper guide vanes 11 and lower guide vanes 21. There is a deflection angle between the upper guide vanes 11 and the lower guide vanes 21 in the circumferential direction, so that each channel between the upper guide vanes 11 is connected to the channels between two lower guide vanes 21, allowing the air flow in the channels of the upper guide vanes 11 to be rectified and converged in the channels of the lower guide vanes 21. The inner and outer conical tubes 22 and the double-stage staggered guide vanes cooperate to guide the collected incoming air into the Venturi tube acceleration structure 2.

[0048] The bottom end of the inner conical tube 12 is a closed structure 13. The tube walls of the inner conical tube 12 and the outer conical tube 22 are formed by the revolution of multiple arc lines, and the arc lines are smoothly connected to each other. The bottom end of the inner conical tube 12 is closed by a circular arc bottom surface, and the circular arc bottom surface is smoothly connected to the revolving conical surface of the inner conical tube 12. The upper part of the lower guide vane 21 is connected to the outer wall of the inner conical tube 12, and the lower part extends to the center of the pipeline and is connected to other lower guide vanes 21.

[0049] The number of blades of the upper guide vane 11 is the same as that of the lower guide vane 21; the blades are evenly arranged.

[0050] The Venturi tube acceleration structure 2 includes: a converging tube section 23 smoothly connected to the outer conical tube 22, a throat tube section 24 smoothly connected to the converging tube section 23, and a diverging tube section 25 smoothly connected to the throat tube section 24; the upper end of the diverging tube section 25 is connected to the upper end of the wind blocking structure 3. A generator is provided in the throat tube section 24.

[0051] For the Venturi tube acceleration structure 2, the converging tube section 23 is hermetically connected to the lower end of the outer conical tube 22. The throat tube section 24 is a straight tube or an arc tube with a small radian. The throat tube section 24 has a large wind energy density and is an ideal position for installing a wind turbine generator. Therefore, a wind turbine generator is provided in the throat tube section 24; after the air flow enters the Venturi tube acceleration structure 2 from the air collection channel, it is continuously concentrated and accelerated through the converging tube section 23, and flows out from the diverging tube section 25 after passing through the throat tube section 24.

[0052] The Venturi tube acceleration structure 2 further accelerates the air flow by means of a narrow pipeline design, utilizing the Venturi effect, which can significantly increase the speed and wind energy density of the air flow, enabling the wind energy collector to generate electricity efficiently at a lower ambient wind speed.

[0053] The throat pipe section 24 is a straight pipe or an arc-shaped pipe with a small curvature. The design of the straight pipe throat pipe section 24 is simple, which can provide a stable air flow channel, reduce the turbulence and resistance of the air flow in the throat pipe section 24. The straight pipe throat pipe section 24 can effectively increase the speed of the air flow to the highest, thereby increasing the wind energy density, which is crucial for the efficient power generation of the wind energy collector, especially in a low-speed wind field environment. The straight throat pipe section 24 is convenient for installing the wind energy collector, such as a small wind turbine. Its structure is simple and it can be fixed and adjusted more easily.

[0054] The arc-shaped pipe throat pipe section 24 with a small curvature can further optimize the flow characteristics of the air flow, reduce the separation and turbulence of the air flow in the throat pipe section 24, and improve the uniformity and stability of the air flow. The arc-shaped pipe throat pipe section 24 can make more effective use of the Venturi effect, further increase the speed of the air flow and the wind energy density, enable the air flow to reach a higher speed in the throat pipe section 24, thereby improving the power generation efficiency of the wind energy collector. The arc-shaped pipe throat pipe section 24 can reduce the impact and energy loss of the air flow in the throat pipe section 24 and improve the efficiency of the entire device.

[0055] The wind blocking structure 3 includes: a wind blocking cover 31 surrounding the outer periphery of the diffuser pipe section 25 and a closed top cover 32; the outer periphery of the wind blocking cover 31 is connected to the outer periphery of the closed top cover 32. The diameter of the wind blocking cover 31 is 1.2 to 4 times the outlet diameter of the diffuser pipe section 25. The height of the wind blocking cover 31 is 0.3 to 1.5 times its diameter.

[0056] The wind blocking structure 3 is composed of a wind blocking cover 31 surrounding a circle outside the Venturi tube acceleration structure 2 and a closed top cover 32 at the upper end. The bottom end of the wind blocking structure 3 is open and communicates with the air. The closed top cover 32 is connected to the outer wall of the Venturi tube acceleration structure 2. The bottom end of the wind blocking cover 31 must be lower than the diffuser pipe section 25. The wind blocking cover 31 can block the incoming wind from the outside and form a negative pressure area inside, generating a negative pressure suction effect on the air flow in the pipe, further increasing the flow rate of the throat pipe section 24.

[0057] The wind blocking structure 3 can block the incoming wind from the outside and form a negative pressure area inside, generating a negative pressure suction effect on the air flow in the pipe. This negative pressure suction effect further increases the flow rate of the throat pipe section 24 and enhances the acceleration effect of the air flow.

[0058] For the specific layout of implementing the double-stage staggered guide vane type wind gathering method, through the summary of the experience of a large number of embodiments, the present invention has summarized the influence law of the value of the deflection angle on the wind gathering performance of the device.

[0059] The deflection angle between the upper-stage guide vane 11 and the lower-stage guide vane 21 and the magnification of the intake air flow satisfy the formula: Where θ is the deflection angle, γ is the circumferential uniform distribution angle, Q0 is the intake air flow corresponding to no deflection (deflection angle is 0) of the lower-stage guide vane 21, Q θ$Q$ is the intake air flow rate corresponding to the deflection angle $\theta$, and $k$ is the proportionality coefficient.

[0060] The magnification factor of the deflection angle between the upper guide vane 11 and the lower guide vane 21 and the average wind speed at the throat satisfies the formula: where $\theta$ is the deflection angle, $\gamma$ is the circumferentially evenly distributed angle, $v$ c is the ambient incoming flow wind speed, and $v$ θ is the average wind speed at the throat corresponding to the deflection angle $\theta$, and $a$, $b$, $c$, $d$ are empirical coefficients.

[0061] There is a deflection angle between the upper guide vane 11 and the lower guide vane 21 in the circumferential direction; the deflection angle between the upper guide vane 11 and the lower guide vane 21 is half of the circumferentially evenly distributed angle of the blade.

[0062] The magnification factor of the deflection angle and the intake air flow rate approximately follows a quadratic function curve relationship and satisfies the formula: where $\theta$ is the deflection angle, $\gamma$ is the circumferentially evenly distributed angle, $Q_0$ is the intake air flow rate corresponding to the non - deflection (deflection angle is 0) of the lower guide vane 21, and $Q$ θ is the intake air flow rate corresponding to the deflection angle $\theta$, $k$ is the proportionality coefficient, and its empirical value is 4.72. According to the formula, when the deflection angle $\theta$ takes the value of half of the circumferentially evenly distributed angle $\gamma$, its intake air flow rate reaches the maximum value, which is 2.18 times the intake air flow rate when the guide vane has no deflection, and the improvement amplitude is extremely significant, and it is basically consistent with the experience of the embodiment.

[0063] The magnification factor of the deflection angle and the average wind speed of the throat pipe section 24 approximately follows a cubic function curve relationship and satisfies the formula: where $\theta$ is the deflection angle, $\gamma$ is the circumferentially evenly distributed angle, $v$ c is the ambient incoming flow wind speed, and $v$ θ is the average wind speed of the throat pipe section 24 corresponding to the deflection angle $\theta$, and $a$, $b$, $c$, $d$ are empirical coefficients, and their empirical values are $a = - 4.34$, $b = 2.44$, $c = 0.28$, $d = 0.04$. According to the formula, when the upper guide vane 11 and the lower guide vane 21 have no deflection, the average wind speed of the throat pipe section 24 has a slight increase of 4% relative to the incoming flow wind speed. This is because the wind speed distribution in the throat pipe section 24 of this type of device is extremely uneven, only 1 / 3 of the area is the high - wind - speed area, and the rest of the area is the low - wind or even windless area, resulting in a small increase in the overall average wind speed of the throat pipe section 24; when the deflection angle takes the value of half of the circumferentially evenly distributed angle, the average wind speed of its throat pipe section 24 reaches the maximum value, and the relative incoming flow wind speed increases by about 25%, indicating that the deflection of the lower guide vane 21 has an obvious effect on improving the wind - gathering performance, and it is basically consistent with the experience of the embodiment.

[0064] The deflection angle of the double-stage staggered guide vanes is taken as half of the circumferentially evenly distributed angle of the guide vanes, so that the lower-stage guide vanes 21 are exactly directly below the center of two adjacent upper-stage guide vanes 11. The upper end of the Venturi tube acceleration structure 2 is connected to the lower end of the outer cone tube 22 by an arc, and the arc at the connection is a tangency constraint, enabling a smooth transition between the two structures.

[0065] The double-stage staggered guide vanes are arranged between the inner cone tube 12 and the outer cone tube 22, dividing the sandwich cavity between the inner and outer cone tubes 22 into multiple inter-vane air inlet channels for guiding the incoming air flow into the air gathering device. The upper-stage guide vanes 11 and the lower-stage guide vanes 21 are composed of the same number of longitudinal blades, obtained by rotating a single blade around the central axis by a uniform angle several times, and this angle is the circumferentially evenly distributed angle; there is a deflection angle between the upper-stage guide vanes 11 and the lower-stage guide vanes 21 in the circumferential direction, and the smaller deflection angle between two adjacent blades of the upper and lower stages is taken as the deflection angle; according to the definition, the maximum value that the deflection angle can take is half of the circumferentially evenly distributed angle, and at this time, the lower-stage guide vanes 21 are exactly directly below the center of two adjacent upper-stage guide vanes 11.

[0066] Now, taking the results of the wind field simulation of a specific double-stage staggered guide vane type air gathering device as an example, the present invention will be further described.

[0067] The double-stage staggered guide vane type air gathering device includes an inlet air gathering structure 1, a Venturi tube acceleration structure 2, and an outlet wind blocking structure 3. The internal connections and mutual connections of the inner cone tube 12, the outer cone tube 22, and the Venturi tube acceleration structure 2 are all smoothly transitioned through tangent arcs.

[0068] The number of both the upper-stage guide vanes 11 and the lower-stage guide vanes 21 is 4, that is, the rotation angle between two adjacent guide vanes in each stage is 90°, and the deflection angle between the upper-stage guide vanes 11 and the lower-stage guide vanes 21 is 45°, so that the lower-stage guide vanes 21 are exactly directly below the center of two adjacent upper-stage guide vanes 11.

[0069] The lower edge surface of the upper-stage guide vanes 11 and the upper edge surface of the lower-stage guide vanes 21 are at the same vertical height.

[0070] The bottom end of the inner cone tube 12 is closed by a circular arc bottom surface and is connected to the upper end part of the lower-stage guide vanes 21, and the lower end parts of each lower-stage guide vanes 21 extend to the center of the pipeline and converge and connect with all the lower-stage guide vanes 21.

[0071] The Venturi tube acceleration structure 2 includes a circular cross-section pipeline smoothly connected in sequence by a contraction pipe section 23, a throat pipe section 24, and an expansion pipe section 25. The included angle between the inlet section of the contraction pipe section 23 and the central axis of the pipeline is 61.9°, the included angle between the outlet section of the expansion pipe and the central axis of the pipeline is 69.5°, the throat pipe section 24 is a straight pipe section, and the center of the throat pipe section 24 is a reserved installation position for the wind energy collector.

[0072] The outlet wind shield structure 3 is composed of a wind shield 31 that surrounds the periphery of the outlet of the expansion pipe section 25 in a circle and a closed top cover 32 at the upper end. The diameter of the wind shield 31 is 2.47 times the diameter of the outlet of the expansion pipe section 25, and the height of the wind shield 31 is 0.72 times the diameter of the wind shield 31.

[0073] Simulate placing this double-stage staggered guide vane type wind concentrating device in a uniform incoming flow environment of 2.5 m / s. The incoming flow direction is parallel to the horizontal plane and the central cross-section of a certain upper guide vane 11 channel. A velocity field with a wind speed of 3.78 m / s can be obtained at the center of the throat pipe section 24, and the flow velocity is increased to more than 1.51 times. According to the wind energy calculation formula, this device can increase the wind energy density of the incoming flow to more than 3.4 times.

[0074] Simulate placing this double-stage staggered guide vane type wind concentrating device in a uniform incoming flow environment of 2.5 m / s. The incoming flow direction is parallel to the horizontal plane and the outer surface of a certain upper guide vane 11. A velocity field with a wind speed of 3.91 m / s can be obtained at the center of the throat pipe section 24, and the flow velocity is increased to more than 1.56 times. According to the wind energy calculation formula, this device can increase the wind energy density of the incoming flow to more than 3.8 times.

[0075] The wind blows from a direction parallel to the ground and is captured by the upper guide vane 11 and introduced into the channel between the upper guide vanes 11 on the windward side. Due to the constraint of the conical pipe wall surface, the air flow deflects in the vertical direction. After the air flow enters the channel, its speed gradually decreases, and the kinetic energy of the air flow becomes pressure energy and gathers and compresses at the arc concave part of the inner conical pipe 12, forming a high-pressure area at the inlet, which causes the subsequent air flow to diffuse against the pressure gradient to the bottom end of the intake channel, seriously blocking the subsequent intake; the setting of the lower guide vane 21 can improve the import blockage phenomenon. It diverts and diffuses the incoming wind from the windward channel of the upper guide vane 11 to the lower channels on both sides. The increase in the cross-sectional area enables the blocked high-pressure gas to be exported in time and form a high-speed jet, and drives the low-speed air in the channels on both sides to generate entrainment and jet, greatly increasing the overall intake air flow of the device; at the same time, the lower guide vane 21 also isolates the windward intake channel from the low-pressure channel on the leeward side, reducing the escape of the captured air flow from the leeward side under the drive of the pressure difference, and allowing the high-speed air flow and the low-speed air flow to converge and mix in the lower intake channel, integrating a regular air flow with a consistent flow direction at the end of the intake channel, greatly improving the flow state and uniformity of the air flow entering the Venturi tube acceleration structure 2, and showing a more significant throttling and speed-increasing effect, and greatly increasing the wind energy density of the throat pipe section 24.

[0076] The present invention utilizes a double-stage staggered guide vane type wind-gathering device to converge and concentrate low-speed wind energy. The device includes a wind-collecting structure 1, a Venturi tube acceleration structure 2, and a wind-blocking structure 3. The wind-collecting structure 1 includes an inner conical tube 12 and an upper-stage guide vane 11, which can collect oncoming wind from multiple circumferential directions. The Venturi tube acceleration structure 2 includes a circular cross-section pipeline in which an outer conical tube 22, a lower-stage guide vane 21, a contraction pipe section 23, a throat pipe section 24, and an expansion pipe section 25 are smoothly connected in sequence, and is used to accelerate the converged oncoming wind. The wind-blocking structure 3 includes a wind shield 31 surrounding the outer circle of the outlet of the expansion pipe section 25 and a closed top cover 32 at the upper end, which blocks the outside oncoming wind and generates a suction acceleration effect on the airflow in the pipe. Through the two-stage staggered arrangement of the guide vane structures, the upper-stage guide vane 11 captures the oncoming wind and guides it into the intake passage for gathering and compressing, and combs and integrates it into a regular air current with a consistent flow direction, improves the import blockage phenomenon to increase the intake air flow, greatly improves the wind energy density in the Venturi tube acceleration structure 2, and improves the wind energy utilization efficiency.

[0077] The above are only embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention are included within the scope of the claims of the present invention pending approval of the application.

Claims

1. A full circumferential wind gathering device, characterized in that, Comprising: An air collecting structure (1), a Venturi tube acceleration structure (2) and a wind shielding structure (3); The air collecting structure (1) includes: a body, a plurality of upper guide vanes (11) and a plurality of lower guide vanes (21). Each of the upper guide vanes (11) and each of the lower guide vanes (21) are respectively arranged on the body. The upper guide vanes (11) and the lower guide vanes (21) are arranged in an interleaved manner. And the lower end of the body is connected to the upper end of the Venturi tube acceleration structure (2), and the wind shielding structure (3) is fixed to the lower end of the Venturi tube acceleration structure (2).

2. The all-round wind gathering device according to claim 1, characterized in that The lower edge of the upper guide vane (11) and the upper edge of the lower guide vane (21) are at the same horizontal height.

3. The all-round wind gathering device according to claim 1, characterized in that, The body includes: an inner conical tube (12) with an opening facing any direction and an outer conical tube (22) arranged at the lower end of the inner conical tube (11); The upper guide vanes (11) are inlaid on the outer side of the inner conical tube (12), the lower guide vanes (21) are inlaid on the inner side of the outer conical tube (22), the lower guide vanes (21) are inlaid on the outer side of the inner conical tube (12), the upper guide vanes (11) are connected to the outer conical tube (22). The lower end of the outer conical tube (22) is connected to the upper end of the Venturi tube acceleration structure (2), and the upper guide vanes (11) are located on the side away from the Venturi tube acceleration structure (2), and the lower guide vanes (21) are located on the side close to the Venturi tube acceleration structure (2).

4. The all-round wind gathering device according to claim 1, wherein An air inlet is formed between any two adjacent upper guide vanes (11) and the inner conical tube (12).

5. The all-round wind gathering device according to claim 1, characterized in that The bottom end of the inner conical tube (12) is a closed structure (13).

6. The all-round wind gathering device according to claim 1, characterized in that, The deflection angle between the upper guide vane (11) and the lower guide vane (21) and the magnification of the intake air flow satisfy the formula: where θ is the deflection angle, γ is the circumferentially evenly distributed angle, Q0 is the intake air flow corresponding to no deflection (deflection angle is 0) of the lower guide vane (21), and Q θ is the intake air flow corresponding to a deflection angle of θ, and k is the proportionality coefficient.

7. The all-round wind gathering device according to claim 6, wherein The deflection angle between the upper guide vane (11) and the lower guide vane (21) and the magnification of the average throat wind speed satisfy the formula: where θ is the deflection angle, γ is the circumferential uniform angle, v c is the environmental incoming flow wind speed, v θ is the average throat wind speed corresponding to the deflection angle of θ, and a, b, c, and d are empirical coefficients.

8. The all-round wind gathering device according to claim 6, characterized in that, The upper guide vanes (11) and the lower guide vanes (21) have a deflection angle in the circumferential direction.

9. The all-round wind gathering device according to claim 8, characterized in that, The deflection angle between the upper guide vanes (11) and the lower guide vanes (21) is half of the circumferential uniform distribution angle of the vanes.

10. The all-round wind gathering device according to claim 1, characterized in that, The upper guide vanes (11) and the lower guide vanes (21) have the same number of vanes.

11. The all-round wind gathering device according to claim 10, characterized in that, The vanes are evenly arranged.

12. The all-round wind-gathering device according to claim 1, characterized in that, The Venturi tube acceleration structure (2) includes: a contraction tube section (23) smoothly connected to the outer conical tube (22), a throat tube section (24) smoothly connected to the contraction tube section (23), and an expansion tube section (25) smoothly connected to the throat tube section (24); The upper end of the expansion tube section (25) is connected to the upper end of the wind shielding structure (3).

13. The all-round wind collecting device according to claim 1, characterized in that, The wind shielding structure (3) includes: a wind shielding cover (31) surrounding the outer periphery of the expansion tube section (25) and a closed top cover (32); The wind shielding cover (31) is connected to the outer periphery of the closed top cover (32).

14. A full circumferential wind gathering device according to claim 12, characterized in that, A generator is provided in the throat tube section (24).

15. The all-round wind gathering device according to claim 14, characterized in that, The throat tube section (24) is a straight tube or an arc-shaped tube.

16. A full circumferential wind gathering device according to claim 13, characterized in that, The diameter of the wind shielding cover (31) is 1.2 to 4 times the outlet diameter of the expansion tube section (25).

17. A full circumferential wind gathering device according to claim 13, characterized in that, The height of the wind shielding cover (31) is 0.3 to 1.5 times its diameter.

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