Vertical shaft wind wheel for improving concave surface wind resistance and vertical shaft resistance type wind driven generator

Abstract

The utility model discloses a vertical axis wind wheel for improving concave surface wind resistance and a vertical axis resistance type wind driven generator. The vertical axis wind wheel comprises a rotating shaft, a plurality of blades and a wind energy absorption device. Each blade comprises a concave face and a convex face which generate different wind resistance when wind blows through the front face and the back face, and the multiple blades are installed on the rotating shaft and evenly distributed in the circumferential direction of the rotating shaft. The wind energy absorption device is arranged on the concave surface of the blade and comprises a plurality of wind shields, and when the concave surface of the blade faces the wind, the wind shields are used for preventing wind from directly flowing out from the periphery of the concave surface of the blade. The wind energy absorption device is arranged on the concave surface of the blade, and the wind blocking plate of the wind energy absorption device is used for blocking wind blowing to the concave surface from directly flowing away around, so that the retention time of the wind on the concave surface of the blade is prolonged, the wind resistance of the concave surface of the blade is increased, the resistance difference between the concave surface of the blade and the convex surface of another blade is increased, and the wind energy utilization rate is increased.

Description

Technical Field

[0001] The utility model relates to the technical field of wind turbines, in particular to a vertical axis wind wheel for improving concave wind resistance and a vertical axis resistance type wind turbine. Background Art

[0002] The vertical axis resistance type wind turbine is the earliest wind turbine used by humans (more than 1,300 years ago). It is simple to make, easy to start, and suitable for lower wind speeds. It was once a vertical axis windmill with a wide range of uses. For example, wind power can be used for irrigation and to drive stone mills for grinding grain. It was many years earlier than the earliest horizontal axis wind turbines that appeared in Europe, so the vertical axis wind turbine can be called the forerunner of all wind turbines.

[0003] Around the rotating shaft of the wind rotor of the vertical axis resistance type wind turbine, there are at least two blades with concave and convex surfaces evenly distributed on the circumference. When they are in different directions, the resistance or thrust they receive relative to the incoming wind direction is different. The difference in air resistance due to the asymmetry of the convex and concave blades of the wind rotor forms a driving force couple around the rotating shaft.

[0004] At present, the wind energy utilization rate of vertical axis resistance type wind turbines on the market is relatively low, and it is urgent to adopt various methods to improve their wind energy utilization rate. Utility Model Content

[0005] The utility model provides a vertical axis wind wheel and a vertical axis resistance type wind turbine for improving concave wind resistance, which are used to solve the technical problem of low wind energy utilization rate of the current vertical axis resistance type wind turbine.

[0006] To solve the above technical problems, in the first aspect, an embodiment of the utility model proposes a vertical axis wind wheel for improving concave wind resistance, comprising a rotating shaft, a plurality of blades and a wind energy absorption device; the blade comprises a concave surface and a convex surface which generate different wind resistances when wind blows from the front and back sides, and a plurality of the blades are mounted on the rotating shaft and evenly distributed along the circumferential direction of the rotating shaft; the wind energy absorption device is arranged on the concave surface of the blade to increase the contact area between the wind and the concave surface of the blade, and the wind energy absorption device comprises a plurality of wind shields, and when the concave surface of the blade faces the wind, the wind shield is used to block the wind from directly flowing out from around the concave surface of the blade, so as to prolong the residence time of the wind on the concave surface of the blade and increase the resistance difference between the concave surface of the blade and the convex surfaces of other blades.

[0007] As a further improvement of the above technical solution:

[0008] The wind shield includes a plurality of first wind shields whose height extension direction is the same as the incoming wind direction and a plurality of second wind shields whose height extension direction forms a preset angle with the incoming wind direction. The first wind shield and the second wind shield are jointly arranged to form a circumferentially unclosed wind cavity, and the first wind shield and the second wind shield form an entrance to the wind cavity at an end away from the concave surface of the blade. When the concave surface of the blade faces the wind, the first wind shield and the second wind shield are used to slow down the flow rate of the wind flowing into the wind cavity from the entrance of the wind cavity and flowing out of the wind cavity.

[0009] As a further improvement of the above technical solution:

[0010] Each wind shield includes a connecting end connected to the concave surface of the blade and a free end opposite to the connecting end. The inlet of the wind cavity is formed between the free ends of the wind shield, and the plurality of free ends are located on the same plane.

[0011] As a further improvement of the above technical solution:

[0012] The first wind shield includes two or more wind shields spaced apart along the longitudinal direction of the rotating shaft, and the second wind shield is in the same direction as the axis of the rotating shaft; the first wind shield and the second wind shield surround three or more side walls of the wind cavity.

[0013] As a further improvement of the above technical solution:

[0014] The wind shields are all curved panels, and the side of each curved panel facing the wind cavity is a concave surface; or, the wind shields are all flat panels; or, the first wind shield is a flat panel, the second wind shield is a curved panel, and the side of the second wind shield facing the wind cavity is a concave surface.

[0015] As a further improvement of the above technical solution:

[0016] There are at least two windshields, and all windshields are arranged in parallel.

[0017] As a further improvement of the above technical solution:

[0018] Each wind shield is perpendicular to the axis of the rotating shaft.

[0019] As a further improvement of the above technical solution:

[0020] The blades include two blades that are symmetrically arranged. The edges of the blades along the longitudinal direction are arc-shaped. In the longitudinal direction, the overall outer contour of the blade is in a shape in which the middle dimension is larger than the dimensions at both ends.

[0021] As a further improvement of the above technical solution:

[0022] The blades are tulip petal-shaped blades, and the blades are connected by a plurality of connecting rods or the wind shields, and the connecting rods or the wind shields are fixedly mounted on the rotating shaft.

[0023] In a second aspect, an embodiment of the utility model further provides a vertical axis resistance type wind turbine, comprising the vertical axis wind wheel and a generator as described in the embodiment of the utility model, wherein the rotating shaft of the vertical axis wind wheel is fixedly connected to the rotor of the generator.

[0024] Beneficial effect: The vertical-axis wind wheel for improving the concave wind resistance in the embodiment of the utility model is provided with a wind energy absorption device on the concave surface of the blade. The wind shield plate of the wind energy absorption device blocks the wind blowing toward the concave surface from flowing directly to the surroundings, thereby prolonging the residence time of the wind on the concave surface of the blade, thereby improving the wind resistance on the concave surface of the blade, increasing the resistance difference between the concave surface of the blade and the convex surface of another blade, and improving the utilization rate of wind energy.

[0025] In the above embodiments, the vertical axis resistance type wind turbine generator and the corresponding vertical axis wind rotor embodiments belong to the same concept, and thus have the same technical effects as the corresponding vertical axis wind rotor embodiments, which will not be described in detail herein.

[0026] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0028] Figure 1 It is a front projection view of the blades of the vertical axis wind wheel of the first preferred embodiment of the utility model;

[0029] Figure 2 yes Figure 1 Schematic diagram of the three-dimensional structure;

[0030] Figure 3 It is a front projection view of the blades of the vertical axis wind wheel of the second preferred embodiment of the utility model;

[0031] Figure 4 It is a front projection view of the blades of the vertical axis wind wheel of the third preferred embodiment of the utility model;

[0032] Figure 5 This is a schematic structural diagram of a vertical axis wind wheel according to a fourth preferred embodiment of the utility model;

[0033] Figure 6It is a structural schematic diagram of a vertical axis resistance type wind turbine according to a preferred embodiment of the utility model.

[0034] The symbols in the figure represent:

[0035] 1. Blades; 11. Connecting rods; 2. Rotating shafts; 3. Wind energy absorbing device; 31. Wind shield; 311. First wind shield; 312. Second wind shield; 4. Generator. DETAILED DESCRIPTION

[0036] The embodiments of the present invention are described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered by the claims.

[0037] In addition, unless otherwise defined, the technical terms or scientific terms used in the description of this application shall be the common meanings understood by the general technicians in the field to which this application belongs. The words "upper", "lower", "left", "right", "center", "vertical", "horizontal", "inside", "outside" and other words indicating orientation used in the description of this application are only used to indicate the relative direction or positional relationship, and do not imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. When the absolute position of the described object changes, its relative positional relationship may also change accordingly, so it cannot be understood as a limitation on this application. The "first", "second", "third" and similar terms used in the description of this application are only used for descriptive purposes to distinguish different components, and cannot be understood as indicating or implying relative importance. The similar words "one", "one" or "the" used in the description of this application should not be understood as an absolute limitation on quantity, but should be understood as the existence of at least one. The similar words "including" or "comprising" used in the description of this application mean that the elements or objects appearing in front of the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects.

[0038] It should also be noted that, unless otherwise clearly specified and limited, the words "installed", "connected", "connected" and similar terms used in the description of this application should be understood in a broad sense. For example, the connection can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, an indirect connection through an intermediate medium, or the internal connection of two components. Technical personnel in the field can understand their specific meanings in this application according to the specific circumstances.

[0039] like Figures 1 to 5As shown, the vertical axis wind wheel for improving concave surface wind resistance of this embodiment includes a rotating shaft 2, a plurality of blades 1 and a wind energy absorbing device 3; the blade 1 includes a concave surface and a convex surface that generate different wind resistances when wind blows from the front and back sides, and the plurality of blades 1 are installed on the rotating shaft 2 and are evenly distributed along the circumferential direction of the rotating shaft 2; the wind energy absorbing device 3 is arranged on the concave surface of the blade 1, and the wind energy absorbing device 3 includes a plurality of wind shields 31. When the concave surface of the blade 1 faces the wind, the wind shield 31 is used to block the wind from directly flowing out from the concave surface of the blade 1, thereby increasing the contact area between the wind and the blade, so as to prolong the residence time of the wind on the concave surface of the blade 1 and increase the resistance difference between the concave surface of the blade 1 and the convex surfaces of other blades 1.

[0040] The vertical axis wind wheel of this embodiment for improving the concave surface wind resistance is provided with a wind energy absorption device 3 on the concave surface of the blade 1. The wind shield plate 31 of the wind energy absorption device 3 blocks the wind blowing toward the concave surface from directly flowing away to the surroundings, thereby prolonging the residence time of the wind on the concave surface of the blade 1, thereby improving the concave surface wind resistance of the blade 1, increasing the resistance difference between the concave surface of the blade 1 and the convex surface of another blade 1, and improving the utilization rate of wind energy.

[0041] Among them, the windshield 31 includes symmetrical distribution and asymmetrical distribution, and the distribution position can be adjusted according to the application scenario. Specifically, the blade 1 in this embodiment is a tulip petal-shaped wind blade, and a plurality of connecting rods 11 are provided on the curved surface of the blade 1. The tulip petal-shaped wind blades are connected together by the connecting rods 11, and the connecting rods 11 are fixedly mounted on the rotating shaft 2, so that the tulip petal-shaped wind blades are fixed on the rotating shaft 2. It should be noted that the tulip petal-shaped wind blades in this embodiment are only used for the description of the embodiments of this application, and cannot be understood as a limitation on this application. In other embodiments, the blade 1 of the vertical axis wind wheel can also be any other curved surface including concave and convex surfaces. The connecting rod 11 is located at the edge of the blade 1 and is fixed on both sides of the blade 1. The blade 1 is fixed on the rotating shaft 2 through the connecting rod 11. In other embodiments, the blade 1 can also be directly connected through the windshield 31, and then the windshield 31 is connected to the connecting rod 11.

[0042] Among them, Figure 6As shown, the vertical axis wind wheel in this embodiment specifically includes two symmetrically arranged blades 1, the edges of which along the longitudinal direction are arc-shaped, and in the longitudinal direction, the overall outer contour of the blade 1 is in a shape in which the middle dimension is larger than the dimension at both ends, the concave surfaces of the two blades 1 are connected toward the rotating shaft 2 and are fixed to the rotating shaft 2 through a connecting rod 11, the two blades 1 are installed in a staggered manner, the staggered parts are connected together through the connecting rod 11, and the staggered and overlapping parts between the two blades 1 cannot exceed half of the width of the blade 1. Such an installation can make the concave surface of one blade 1 of the vertical axis wind wheel face the wind while the convex surface of the other blade 1 faces the wind, so that the two blades are subjected to different resistance or thrust, and the asymmetric air resistance difference of the convex and concave blades 1 of the vertical axis wind wheel forms a driving force couple around the rotating shaft 2, driving the blades 1 to rotate around the rotating shaft 2.

[0043] In some embodiments, the wind shield 31 includes a plurality of first wind shields 311 whose height extension direction is the same as the incoming wind direction and a plurality of second wind shields 312 whose height extension direction forms a preset angle with the incoming wind direction. The first wind shields 311 and the second wind shields 312 are jointly arranged to form a circumferentially unclosed wind cavity, and the first wind shields 311 and the second wind shields 312 form an entrance to the wind cavity at an end away from the concave surface of the blade 1. When the concave surface of the blade 1 faces the wind, the first wind shield 311 and the second wind shield 312 are used to slow down the flow rate of the wind flowing into the wind cavity from the entrance of the wind cavity and flowing out of the wind cavity.

[0044] Among them, the height extension direction of the first wind shield 311 and the second wind shield 312 can be perpendicular to the concave surface of the corresponding blade 1, and can also be at a preset angle to the incoming wind direction. In this embodiment, the height extension direction of the first wind shield 311 and the second wind shield 312 is the same as the incoming wind direction (that is, the first wind shield 311 is perpendicular to the blade 1). The first wind shield 311 and the second wind shield 312 are jointly arranged to form a plurality of circumferentially unclosed wind cavities. Since the circumference of the wind cavity is not closed, the wind energy absorption device 3 as a whole is in a maze shape. When the concave surface of the blade 1 faces the wind, the first wind shield 311 and the second wind shield 312 are used to slow down the flow rate of the wind flowing into the wind cavity from the inlet of the wind cavity and flowing out of the wind cavity, thereby increasing the wind resistance of the concave surface of the blade 1.

[0045] In some embodiments, each wind shield 31 includes a connecting end connected to the concave surface of the corresponding blade 1 and a free end opposite to the connecting end. The entrance of the wind cavity is formed between the free ends of the wind shield 31. Multiple free ends are located on the same plane. All wind shields 31 have the same height, so that the wind shields 31 are universal. Different wind shields 31 can be installed at any position on the concave surface of the blade 1.

[0046] In some embodiments, the first wind shield 311 includes two or more wind shields spaced apart along the longitudinal direction of the rotating shaft 2, and the second wind shield 312 is in the same direction as the axis of the rotating shaft 2; the first wind shield 311 and the second wind shield 312 surround three or more side walls of the wind cavity.

[0047] Specifically, in the present embodiment, the first wind shield 311 includes two pieces spaced apart along the longitudinal direction of the rotating shaft 2, and the length direction of the second wind shield 312 is aligned with the axis of the rotating shaft 2, including two pieces respectively arranged on different sides of the two first wind shields 311; the first wind shield 311 and the second wind shield 312 respectively form four side walls surrounding a wind cavity, and outlets are formed between adjacent side walls, so that the first wind shield 311 and the second wind shield 312 constitute a maze-shaped wind energy absorption device 3, and the wind flows away from the openings between the wind shields 31 after being blocked by the wind shields 31, so that the wind can avoid forming vortices in the closed wind cavity, so that the four wind shields 31 can block the wind to avoid the wind from flowing directly from the concave surface of the blade 1 while avoiding the vortex from impacting the wind shield 31, thereby increasing the service life of the wind shield 31.

[0048] In some embodiments, there are at least four wind shields 31, which are used to block the wind from flowing directly from the concave surface of the blade 1 in four directions: up, down, left and right. In this embodiment, there are four wind shields 31, and the four wind shields 31 block the wind from the concave surface of the blade 1 to prevent the wind from flowing directly from the edge of the concave surface, thereby increasing the wind resistance of the concave surface of the blade 1. In other embodiments, more than four wind shields 31 can be set in the curved surface of the blade 1 to form multiple wind cavities. The number of wind shields 31 in this embodiment should not be understood as a limitation on the present application.

[0049] In some embodiments, Figure 1 and Figure 2 As shown, all the windshields 31 are flat plates, and there are four of them. The four flat windshields 31 form a maze-like wind energy absorption device 3. When the wind blows toward the concave surface of the blade 1, it will be blocked by the four flat windshields 31, so as to prevent the wind from flowing directly around the concave surface, prolong the residence time of the wind on the concave surface of the blade 1, thereby increasing the wind resistance of the concave surface of the blade 1, and improving the resistance difference between the concave surface of the blade 1 and the convex surface of another blade 1, thereby improving the utilization rate of wind energy.

[0050] In some embodiments, Figure 3As shown, all the windshields 31 are curved panels, and the side of each curved panel facing the wind cavity is a concave surface. The concave surface of the curved windshield 31 faces the side of another curved windshield 31. There are four curved windshields 31, and the four curved windshields 31 constitute a maze-like wind energy absorption device 3. When the wind blows toward the concave surface of the blade 1, it will be blocked by the four curved windshields 31 to prevent the wind from flowing directly around the concave surface. At the same time, when the wind hits the concave surface of the curved windshield 31, it will be blocked by the curved windshield 31. Compared with the flat windshield 31, the curvature of the curved windshield 31 will better block the wind.

[0051] In some embodiments, the windshield 31 is a combination of any number of flat panels and curved panels, such as Figure 4 As shown, in this embodiment, there are four wind shields 31, among which the first wind shield 311 is a flat plate, the second wind shield 312 is a curved plate, and the side of the second wind shield 312 facing the wind cavity is a concave surface, the first wind shield 311 is used to block the wind from flowing directly from the up and down directions of the concave surface of the blade 1, the concave surface of the curved wind shield 31 faces the side of the flat wind shield 31, and the second wind shield 312 is used to block the wind from flowing directly from the left and right directions of the concave surface of the blade 1, and the two first wind shields 311 and the two second wind shields 312 constitute a maze-like wind energy absorption device 3.

[0052] In some embodiments, Figure 5 As shown, there are at least two windshields 31, which are arranged in parallel. In this embodiment, there are specifically five windshields 31. The five parallel windshields 31 and the curved surfaces on the left and right sides of the blade 1 form four wind cavities for accommodating wind. When the wind blows toward the concave surface of the blade 1, the wind will be blocked by the windshields 31 when it flows from the upper and lower directions of the blade 1, and the curvature of the curved surface of the blade 1 will block the wind when it flows from the left and right sides of the blade 1, so that the wind stays in each wind cavity to increase the wind resistance of the concave surface of the blade 1.

[0053] Specifically, in this embodiment, the wind shield 31 is perpendicular to the rotating shaft 2. In this embodiment, the wind shield 31 is a flat plate. In other embodiments, the wind shield 31 may also be a curved plate or a plate or block of any other shape, and may have an inclination angle with the rotating shaft 2, as long as the wind shield 31 can block the wind blowing toward the concave surface of the blade 1.

[0054] The vertical axis wind wheel for improving the concave surface wind resistance provided in the above-mentioned embodiment of the present application, when the concave surface of the blade 1 faces the wind, the wind in the concave surface is blocked by the wind shield 31 of the wind energy absorption device 3, so as to prevent the wind from directly flowing around the concave surface, thereby prolonging the residence time of the wind on the concave surface of the blade 1, thereby improving the concave surface wind resistance of the blade 1, increasing the resistance difference between the concave surface of the blade 1 and the convex surface of another blade 1, so as to improve the utilization rate of wind energy.

[0055] like Figure 6 As shown, on the other hand, an embodiment of the present application further provides a vertical axis resistance type wind turbine, including a vertical axis wind wheel for improving concave wind resistance and a generator 4 according to an embodiment of the present application, wherein the rotating shaft 2 of the vertical axis wind wheel is fixedly connected to the rotor of the generator 4.

[0056] In the vertical axis resistance type wind turbine of this embodiment, the concave surface of the blade 1 of the vertical axis wind wheel can better absorb wind energy and increase the resistance difference between the concave and convex surfaces of the blade 1, thereby improving the utilization rate of wind energy and the power generation efficiency.

[0057] The above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. For those skilled in the art, the utility model may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A vertical axis wind wheel for improving concave wind resistance, characterized in that: It comprises a rotating shaft (2), a plurality of blades (1) and a wind energy absorbing device (3); The blade (1) comprises a concave surface and a convex surface which generate different wind resistances when wind blows through from the front and back sides; a plurality of blades (1) are mounted on the rotating shaft (2) and are evenly distributed along the circumferential direction of the rotating shaft (2); The wind energy absorption device (3) is arranged on the concave surface of the blade (1), and the wind energy absorption device (3) comprises a plurality of wind shields (31). When the concave surface of the blade (1) faces the wind, the wind shields (31) are used to block the wind from directly flowing out from the concave surface of the blade (1) around the blade (1), so as to prolong the time that the wind stays on the concave surface of the blade (1) and increase the resistance difference between the concave surface of the blade (1) and the convex surface of other blades (1).

2. The vertical axis wind wheel for improving concave wind resistance according to claim 1, characterized in that: The wind shield (31) comprises a plurality of first wind shields (311) whose height extension direction is the same as the incoming wind direction, and a plurality of second wind shields (312) whose height extension direction forms a preset angle with the incoming wind direction, the first wind shield (311) and the second wind shield (312) are jointly arranged to form a circumferentially unclosed wind cavity, and the first wind shield (311) and the second wind shield (312) form an inlet of the wind cavity at an end away from the concave surface of the blade (1), and when the concave surface of the blade (1) faces the wind, the first wind shield (311) and the second wind shield (312) are used to slow down the flow rate of the wind flowing into the wind cavity through the inlet of the wind cavity and flowing out of the wind cavity.

3. The vertical axis wind wheel for improving concave wind resistance according to claim 2, characterized in that: Each wind shield (31) comprises a connecting end connected to the concave surface of the blade (1) and a free end opposite to the connecting end. The entrance of the wind cavity is formed between the free ends of the wind shield (31), and the plurality of free ends are located on the same plane.

4. The vertical axis wind wheel for improving concave wind resistance according to claim 2, characterized in that: The first windshield (311) comprises two or more windshields spaced apart in the longitudinal direction of the rotating shaft (2); the second windshield (312) is in the same direction as the axis of the rotating shaft; The first wind shield plate (311) and the second wind shield plate (312) are arranged to surround and form three or more side walls of the wind cavity.

5. The vertical axis wind wheel for improving concave wind resistance according to claim 2, characterized in that: The wind shield plates (31) are all curved plates, and the side of each curved plate facing the wind cavity is a concave surface; Or, the windshield plates (31) are all flat plates; Alternatively, the first wind shield (311) is a flat plate, the second wind shield (312) is a curved plate, and the side of the second wind shield (312) facing the wind cavity is a concave surface.

6. The vertical axis wind wheel for improving concave wind resistance according to claim 1, characterized in that: There are at least two wind shields (31), and all wind shields (31) are arranged in parallel.

7. The vertical axis wind wheel for improving concave wind resistance according to claim 6, characterized in that: Each wind shield (31) is perpendicular to the axis of the rotating shaft (2).

8. The vertical axis wind wheel for improving concave wind resistance according to claim 1, characterized in that: The blade (1) comprises two symmetrically arranged blades, the edges of the blade (1) along the longitudinal direction are in an arc shape, and in the longitudinal direction, the overall outer contour of the blade (1) is in a shape in which the middle dimension is larger than the dimensions at both ends.

9. The vertical axis wind wheel for improving concave wind resistance according to claim 1, characterized in that: The blades (1) are connected by a plurality of connecting rods (11) or the wind shield (31), and the connecting rods (11) or the wind shield (31) are fixedly mounted on the rotating shaft (2).

10. A vertical axis resistance type wind turbine, characterized in that: It comprises the vertical axis wind wheel and the generator (4) as claimed in any one of claims 1 to 9, wherein the rotating shaft (2) of the vertical axis wind wheel is fixedly connected to the rotor of the generator (4).

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