Fan blade assembly, vertical axis wind turbine and ship
By designing a helical blade assembly, the problem of shaft bending moment load in the application of vertical axis wind turbines on ships was solved, achieving higher stability and efficiency in wind energy acquisition, and improving safe wind speed and resistance to large waves.
Patent Information
- Application Number
- CN202520337686.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-27
- Publication Date
- 2026-02-13
- Estimated Expiration
- 2035-02-27
AI Technical Summary
Existing vertical axis wind turbines have difficulty effectively reducing the bending moment load on the shaft in marine applications, resulting in poor stability and efficiency of wind energy harvesting.
Design a wind turbine assembly with two helical blades, the bottom diameter being larger than the top diameter. The helical blades have a gap at a virtual axis and a wind cup on the blade. The pitch of the helical blade is 2h. The bottom and top diameters of the helical blades partially overlap. The radius of the helical blade changes at a rate of k. The initial included angles between the bottom and top of the helical blade are α and β.
It reduces the inertial force of the shaft and the bending moment load caused by wind, reduces the starting wind speed requirement, improves the stability and safe wind speed for wind energy acquisition, and reduces the sway amplitude of the ship in large waves.
Smart Images
Figure CN223908319U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the field of wind power generation wind blade, especially a kind of wind blade assembly, vertical axis wind turbine and ship. BACKGROUND
[0002] In today's energy field, vertical axis wind turbine occupies an important position in the development and utilization of renewable energy.At present, the common vertical axis wind turbine mainly has the following three types:
[0003] First, H type Darrieus vertical axis wind turbine, with the advantage of higher wind energy conversion rate, but lower solidity (solidity = wind blade windward area / swept area) makes the required swept area increases under the same power, weight increases, and the starting wind speed is also significantly higher.
[0004] Second, Savonius equal-diameter non-helical vertical axis wind turbine, its blade structure is relatively simple, and the cost is lower, however, there is a starting dead angle, and the bending moment of rotating rod is larger.
[0005] Third, Savonius equal-diameter helical vertical wind turbine, although there is no starting dead angle, rotation is relatively smooth, but the wind energy conversion rate is low.
[0006] When vertical axis wind turbine is applied to the field of transportation, especially ship, new problems are generated.As the ship sails on the sea, it will swing with wind and wave, which makes the rotating shaft of vertical axis wind turbine bear the inertia force caused by wind and wave swing and the bending moment load brought by wind force.In such application scenario, the existing vertical axis wind turbine is difficult to perfectly adapt, and cannot effectively reduce the bending moment load, thereby affecting the stability and efficiency of renewable energy acquisition of ship. SUMMARY
[0007] In order to overcome the deficiencies of the prior art, one of the purposes of the utility model is to provide a wind blade assembly, the second purpose of the utility model is to provide a vertical axis wind turbine, and the third purpose of the utility model is to provide a ship, which can reduce the bending moment load of rotating shaft, thereby improving the stability and efficiency of wind energy acquisition.
[0008] One of the purposes of the utility model is realized by the following technical scheme:
[0009] A fan blade assembly comprises two helical blades, either of which can coincide with the other after rotating 180° around a virtual axis, the bottom and top of each of the two helical blades are semicircular, the diameters of the bottom of the two helical blades are on the same straight line, the diameters of the top of the two helical blades are on the same straight line, the bottom of each of the two helical blades is on a first virtual plane, the top of each of the two helical blades is on a second virtual plane, the first virtual plane is parallel to the second virtual plane, the virtual axis is perpendicular to the first virtual plane, the diameter of the bottom of each of the helical blades is greater than the diameter of the top, the two helical blades are provided with a gap at the virtual axis, and the airflow blowing to the concave surface of either of the helical blades can be guided to the concave surface of the other helical blade through the gap.
[0010] Further, the diameters of the bottom of the two helical blades partially coincide, and the diameters of the top of the two helical blades partially coincide.
[0011] Further, the diameters of the bottom of the two helical blades coincide partially with a length of S, and the sum of the diameters of the bottom of the two helical blades is D, wherein S / (D-S)∈[0.1, 0.15].
[0012] Further, the diameters of the top of the two helical blades coincide partially with a length of s, and the sum of the diameters of the top of the two helical blades is d, wherein s / (d-s)∈[0.1, 0.15].
[0013] Further, the radius of the helical blade at any position is R', the radius of the top of the helical blade is r, the height of the helical blade is h, the change rate of the radius of the helical blade along the direction from the second virtual plane to the first virtual plane is k, and the distance between the point on the virtual axis corresponding to the radius of the helical blade at any position and the upper bottom of the helical blade is x, wherein R'=r+kx; R'∈[h / 2, 2h], r∈(0, h / 4], k∈[1, 2], x∈[0, h].
[0014] Further, the pitch of the helical blade is 2h.
[0015] Further, the first virtual plane has a virtual reference line, the initial angle between the diameter of the bottom of the helical blade and the virtual reference line is α, and the initial angle between the radius of the helical blade at the value of x and the virtual reference line is β, wherein β=α+π / x; α∈[0, π), β∈[π / x, π+π / x).
[0016] Further, the bottom of each of the helical blades is provided with a wind cup, and the wind cup is in the shape of 1 / 4 hollow sphere.
[0017] The second purpose of the utility model is achieved by the following technical scheme:
[0018] A vertical axis wind turbine comprises a rotating shaft and a wind blade assembly, and the shaft core of the rotating shaft coincides with the virtual shaft of the wind blade assembly.
[0019] The third purpose of the utility model is achieved by the following technical scheme:
[0020] A ship comprises a ship body and a vertical axis wind turbine arranged on the ship body.
[0021] Compared with the prior art, the utility model has the beneficial effects that the bottom diameter of the helical blade is greater than the top diameter, the bending moment load caused by inertial force and wind force can be reduced, the requirement for the starting wind speed is further reduced, that is, the helical blade has a smaller starting wind speed, the design of the helical blade with a large top diameter and a small bottom diameter can reduce the gravity center, which means that when the helical blade is applied to a ship, the shaking amplitude of the helical blade is smaller than that of an equal-diameter helical blade with the same windward area when the ship encounters a large wave, so that the maximum safe wind speed is improved, and the design of the helical blade with a large top diameter and a small bottom diameter can also better adapt to the laminar flow decrease phenomenon caused by wind passing through the deck. BRIEF DESCRIPTION OF DRAWINGS
[0022] Figure 1 Fig. 1 is a first view of a wind blade assembly of the utility model;
[0023] Figure 2 Fig. 2 is a second view of the wind blade assembly of the utility model;
[0024] Figure 3 Fig. 3 is a height diagram of a helical blade in the wind blade assembly of the utility model;
[0025] Figure 4 Fig. 4 is a bottom view of the wind blade assembly of the utility model;
[0026] Figure 5 Fig. 5 is a top view of the wind blade assembly of the utility model;
[0027] Figure 6 Fig. 6 is a schematic view of a vertical axis wind turbine of the utility model;
[0028] Figure 7 Fig. 7 is a schematic view of a ship of the utility model.
[0029] In the drawing: 1, helical blade; 2, wind cup; 3, rotating shaft; 4, ship body. DETAILED DESCRIPTION
[0030] For the convenience of understanding the present application, the present application will be described more fully below with reference to the accompanying drawings. The preferred embodiments of the present application are shown in the drawings. However, the present application can be realized in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of the present application can be more thoroughly and completely understood.
[0031] It should be noted that when an element is referred to as being "on" another element, it can be directly on the other element or intervening elements can also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements can also be present. As used herein the terms "vertical", "horizontal", "left", "right" and similar expressions are used for the purpose of illustration only.
[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.
[0033] Embodiment one
[0034] Referring to Figures 1-5 As shown in the figure, the fan blade assembly provided by the embodiment one of the present application is shown. The fan blade assembly includes two spiral blades 1, wherein any one of the spiral blades 1 can coincide with the other spiral blade 1 after rotating 180° around a virtual axis, the bottom and the top of the two spiral blades 1 are both semicircular, the diameters of the bottom of the two spiral blades 1 are located on the same straight line, the diameters of the top of the two spiral blades 1 are located on the same straight line, the bottom of the two spiral blades 1 are both located on a first virtual plane, the top of the two spiral blades 1 are both located on a second virtual plane, the first virtual plane is parallel to the second virtual plane, the virtual axis is perpendicular to the first virtual plane, the diameter of the bottom of each spiral blade 1 is greater than the diameter of the top, the two spiral blades 1 are provided with a gap at the virtual axis, and the air flow blown to the concave surface of any one of the spiral blades 1 can be introduced to the concave surface of the other spiral blade 1 through the gap.
[0035] The bottom diameter of the above-mentioned spiral blade is larger than the top diameter, which can reduce the bending moment load caused by inertial force and wind force, and further reduce the requirement for starting wind speed, i.e., the spiral blade has a smaller starting wind speed. In addition, the design of the spiral blade with a large top diameter and a small bottom diameter (variable diameter) can reduce the center of gravity, which means that when the spiral blade is applied to a ship, the swing amplitude of the spiral blade is smaller than that of a spiral blade with the same windward area and the same diameter when the ship encounters a large wave, so that the maximum safe wind speed is improved. In addition, the design of the spiral blade with a large top diameter and a small bottom diameter (variable diameter) can better adapt to the phenomenon of laminar flow decrease when the wind passes through the deck.
[0036] In the embodiment, with reference to Figures 4-5 , the bottom diameters of the two spiral blades 1 partially overlap, and the top diameters of the two spiral blades 1 partially overlap. Specifically, the length of the overlapping part of the bottom diameters of the two spiral blades 1 is S, and the sum of the bottom diameters of the two spiral blades 1 is D, where S / (D-S) ∈ [0.1, 0.15]. The length of the overlapping part of the top diameters of the two spiral blades 1 is s, and the sum of the top diameters of the two spiral blades 1 is d, where s / (d-s) ∈ [0.1, 0.15]. The radius of the spiral blade 1 at any position is R', the top radius of the spiral blade 1 is r, the height of the spiral blade 1 is h, the change rate of the radius of the spiral blade 1 along the direction from the second virtual plane to the first virtual plane is k, and the distance between the point on the virtual axis corresponding to the radius of the spiral blade 1 at any position and the upper bottom is x, where R' = r + kx; R' ∈ [h / 2, 2h], r ∈ (0, h / 4], k ∈ [1, 2], x ∈ [0, h]. The pitch of the spiral blade 1 is 2h. The first virtual plane has a virtual reference line, the initial angle between the diameter of the bottom of the spiral blade 1 and the virtual reference line is α, and the initial angle between the radius of the spiral blade 1 at the x value and the virtual reference line is β, where β = α + π / x; α ∈ [0, π), β ∈ [π / x, π + π / x). It should be noted that the pitch of the spiral blade 1 is 2h, i.e., the twist angle of the spiral blade itself in the embodiment is 180°.
[0037] In the embodiment, each spiral blade 1 is provided with a wind cup 2, and the wind cup 2 is in the shape of a 1 / 4 hollow sphere. By providing the wind cup 2, the windward area can be further increased, and the wind energy conversion efficiency can be improved.
[0038] Embodiment Two
[0039] With reference to Figure 6A vertical axis wind turbine, comprising a rotating shaft 3 and the wind blade assembly in embodiment one, and the axis core of the rotating shaft 3 coincides with the virtual axis of the wind blade assembly. Based on the same reason, the vertical axis wind turbine can also reduce the bending moment load caused by the inertial force and wind force, and further reduce the requirement for the starting wind speed. Similarly, when applied on a ship, the swing range of the vertical axis wind turbine is smaller than that of the equal-diameter helical blade with the same windward area when encountering large waves, the maximum safe wind speed is improved, and the laminar flow decrease phenomenon generated when the wind passes through the deck can be better adapted.
[0040] Embodiment three
[0041] Refer to Figure 7 A ship, comprising a ship body 4 and the vertical axis wind turbine in embodiment two arranged on the ship body 4. The swing range of the vertical axis wind turbine is smaller than that of the equal-diameter helical blade with the same windward area when encountering large waves, the maximum safe wind speed is improved, and the laminar flow decrease phenomenon generated when the wind passes through the deck can be better adapted.
[0042] The above only describes the embodiments of the present application, and does not limit the patent range of the present application, and any equivalent structure or equivalent process transformation based on the content of the present application specification and drawings, or direct or indirect application in other related technical fields, are also included in the patent protection range of the present application.
Claims
1. A fan blade assembly, comprising: The two spiral blades are coincided after rotating 180° around a virtual axis, the bottom and the top of the two spiral blades are semicircular, the diameters of the bottom of the two spiral blades are on the same straight line, the diameters of the top of the two spiral blades are on the same straight line, the bottom of the two spiral blades are on the first virtual plane, the top of the two spiral blades are on the second virtual plane, the first virtual plane is parallel to the second virtual plane, the virtual axis is perpendicular to the first virtual plane, the diameter of the bottom of each spiral blade is larger than the diameter of the top, the two spiral blades are provided with a gap at the virtual axis, the air flow blowing to the concave surface of any spiral blade can be guided to the concave surface of the other spiral blade through the gap.
2. The blade assembly of claim 1, wherein: The diameters of the bottom of the two spiral blades are partially coincided, the diameters of the top of the two spiral blades are partially coincided.
3. The blade assembly of claim 2, wherein: The length of the coincided part of the diameters of the bottom of the two spiral blades is S, the sum of the diameters of the bottom of the two spiral blades is D, wherein S / (D-S) ∈ [0.1, 0.15].
4. The blade assembly of claim 2, wherein: The length of the coincided part of the diameters of the top of the two spiral blades is s, the sum of the diameters of the top of the two spiral blades is d, wherein s / (d-s) ∈ [0.1, 0.15].
5. The blade assembly of any one of claims 1-4, wherein: The radius of any part of the spiral blade is R', the radius of the top of the spiral blade is r, the height of the spiral blade is h, the change rate of the radius of the spiral blade along the direction from the second virtual plane to the first virtual plane is k, the distance between the point on the virtual axis corresponding to the radius of any part of the spiral blade and the upper bottom of the spiral blade is x, wherein R' = r + kx; R' ∈ [h / 2, 2h], r ∈ (0, h / 4], k ∈ [1, 2], x ∈ [0, h].
6. The blade assembly of claim 5, wherein: The pitch of the spiral blade is 2h.
7. The blade assembly of claim 5, wherein: The first virtual plane has a virtual reference line, the initial angle between the diameter of the bottom of the spiral blade and the virtual reference line is α, the initial angle between the radius of the spiral blade at the value x and the virtual reference line is β, wherein β = α + π / x; α ∈ [0, π), β ∈ [π / x, π + π / x). 8.The blade assembly of claim 1, wherein: The bottom of each spiral blade is provided with a wind cup, the wind cup is 1 / 4 hollow spherical.
9. A vertical axis wind turbine characterised in that, The vertical axis wind turbine comprises a rotating shaft and the fan blade assembly according to any one of claims 1-8, the axis core of the rotating shaft is coincided with the virtual axis of the fan blade assembly.
10. A vessel, characterized in that The vertical axis wind turbine comprises a ship body and the fan blade assembly according to claim 9.