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Abstract

The present invention relates to the field of wind blade design, and discloses a blade, including a core shaft and a sheet body, wherein the sheet body is evenly distributed around the core shaft in the circumferential direction and the end of the sheet body tail edge is fixedly connected to the core shaft, and at least one of the other three sides of the sheet body is provided with an auxiliary blade on the front or back side, and the shape of the auxiliary blade is an equidistant surface of the corresponding sheet body part; the two ends of the auxiliary blade are connected to the core shaft or the sheet body through a bracket, and the present application also provides a deceleration blade, wherein the auxiliary blade is arranged on the leeward side of the sheet body. The beneficial effects of the present invention are: improving the force condition of the blade, and arranging it on the front side of the windward surface can increase the positive force surface area and instantaneous wind speed of the blade, provide positive thrust, and help it to rotate and work normally in light wind and weak wind conditions; when it is arranged on the back side of the windward surface, it can play the effect of increasing resistance, thereby stabilizing the wind blade and reducing the wind speed.

Description

Technical Field

[0001] The invention relates to the field of wind blade design, and in particular to a blade. Background Art

[0002] The wind blade is a common component of the wind power generation system. The existing wind blades are mostly set with multiple blade rings and core shafts. The blades are rotated by force to drive the core shaft to rotate, thereby generating power. In order to better bear the force, the blades are usually designed to be curved. Since the load of the power generation system is usually relatively large, the windward side of the existing blade structure can rotate when the wind is strong, but it does not rotate in light winds, causing the equipment to be idle and unable to effectively utilize resources.

[0003] In addition, the greater the wind force on the blades of the existing structure, the faster their rotation speed. When the rotation speed exceeds a certain value, the speed must be limited, otherwise it will damage the power generation system and transmission system. At present, wind power generation systems usually use speed limiting mechanisms to limit the speed, usually electromagnetic brake systems. However, when the wind speed is uneven and the rotation speed of the blades is uneven, the speed limiting mechanism is frequently activated, resulting in large losses and high costs. Summary of the invention

[0004] In order to overcome the above defects, the present invention provides a blade.

[0005] In order to achieve the above object, the technical solution of the present invention is:

[0006] A blade includes a core shaft and a blade body, wherein the blade body is evenly distributed around the core shaft in the circumferential direction and the tail end of the blade body is fixedly connected to the core shaft, and at least one of the other three sides of the blade body is provided with an auxiliary blade on the front or back side, and the shape of the auxiliary blade is an equidistant surface of the corresponding blade body part; the two ends of the auxiliary blade are connected to the core shaft or the blade body through a bracket. It should be noted that the other three sides of the blade body referred to in this application refer to the front side and the rear side in the rotation direction of the blade body, and one side located on the outer contour of the blade body.

[0007] Preferably, the equidistant surface is a shape corresponding to the orthographic projection of the auxiliary blade on the sheet body or / and the designed curved surface extending outward from the edge of the sheet body.

[0008] Preferably, one end of the auxiliary blade in the radial direction close to the core shaft is fixedly connected to the core shaft, and the other end of the auxiliary blade in the radial direction is fixedly connected to the corresponding sheet body through a bracket.

[0009] Preferably, both ends of the auxiliary blade are fixedly connected to the corresponding sheet body through a bracket. Specifically, when used, according to the length of the auxiliary blade, a bracket can also be provided in the middle of the auxiliary blade and the sheet body for support and fixation.

[0010] Preferably, the auxiliary blade is arranged at one end of the sheet body away from the core shaft in the radial direction, and both ends of the auxiliary blade in the circumferential direction are fixedly connected to the corresponding sheet body through a bracket.

[0011] Preferably, the bracket is a folding bracket.

[0012] The working principle of the present application is: by arranging equally spaced auxiliary blades at the edge of the sheet body, a narrow channel effect is formed between the auxiliary blades and the sheet body, that is, the wind speed in the channel formed between the auxiliary blades and the sheet body will increase, and the pressure will become greater.

[0013] When the auxiliary blades are arranged on the front side of the blade body, that is, the windward side, the wind speed in the channel and the windward side can be increased in light or weak wind conditions, thereby forming a positive thrust, thereby enabling the breeze power generation system to start at a lower wind speed.

[0014] When the auxiliary blades are set on the reverse side of the blade body, that is, the leeward side, a reverse thrust will be formed when the wind flows through, which will reduce the rotation speed of the fan blades, thereby achieving the effect of reducing the speed and stabilizing the system.

[0015] The auxiliary blade and the corresponding blade body have the same orthographic projection shape contour on the design surface, which can avoid turbulence caused by different fluid trajectories.

[0016] The beneficial effects of the present invention are as follows: 1. It improves the stress condition of the blades. When it is set on the front of the windward surface, it can increase the positive stress surface area and instantaneous wind speed of the blades, provide positive thrust, and help it to rotate and work normally in light wind and weak wind conditions; when it is set on the back of the windward surface, it can increase the resistance, thereby stabilizing the blades and reducing the wind speed. It can also be combined with the opening and folding mechanism of the prior art to achieve control of the opening to decelerate when the wind speed is large and unstable, and fold to the back of the blade when the wind speed is low to avoid affecting the wind speed. 2. It has wide adaptability and can be further applied to hydropower generation systems or screw propulsion systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of Example 1 of the present invention.

[0018] Figure 2 for Figure 1 Cross-sectional view of .

[0019] Figure 3 This is a schematic diagram of the structure of Example 2 of the present invention.

[0020] Figure 4 This is a schematic diagram of the structure of Example 3 of the present invention.

[0021] Figure 5 This is a schematic diagram of the structure of Example 4 of the present invention. DETAILED DESCRIPTION

[0022] The present invention will be further described below in conjunction with specific embodiments.

[0023] Example 1

[0024] like Figure 1 and Figure 2 As shown, a blade includes a core shaft 1 and a sheet body 2, wherein the sheet body 2 is evenly distributed around the core shaft 1 and the tail end of the sheet body is fixedly connected to the core shaft 1, and an auxiliary blade 3 is provided on the head end edge of the sheet body 2, and the shape of the auxiliary blade 3 is an equidistant surface of the corresponding sheet body part; the two ends of the auxiliary blade are fixedly connected to the sheet body through a bracket 4.

[0025] Example 2

[0026] like Figure 3 As shown, a blade includes a core shaft 1 and a sheet body 2, wherein the sheet body 2 is evenly distributed around the core shaft 1 and the tail end of the sheet body is fixedly connected to the core shaft 1, and one side edge of the sheet body 2 is provided with an auxiliary blade 3, and the shape of the auxiliary blade 3 is an equidistant surface of the corresponding sheet body part; the two ends of the auxiliary blade are fixedly connected to the sheet body through a bracket 4.

[0027] Example 3

[0028] In this embodiment, the bracket is an electric folding bracket, which is mainly used to open the auxiliary blades when needed to form a channel between the blade body, and to fold the auxiliary blades and the blade body when not needed to reduce resistance.

[0029] Figure 4 The structure of one form of electric bracket is shown. Specifically, the bottom and top of the two brackets 4 are respectively hinged with the sheet body and the auxiliary blade 3. A fixed pulley 5 is respectively arranged at the front and rear of the bracket on the sheet body. A forward and reverse motor 6 is arranged in the core shaft 1. A wire wheel 7 is arranged on the rotating shaft. A winding wire is arranged on the wire wheel. The winding wire comes out at both ends. One end of the wire is fixedly connected to the auxiliary blade through a fixed pulley, and the other end of the wire is fixedly connected to the auxiliary blade through another fixed pulley. A limit block 8 is arranged on the sheet body to limit the bracket to a vertical position when the winding wire pulls the auxiliary blade to rise. A positioning block 9 is arranged on the upper part of the bracket to keep the auxiliary blade parallel when the auxiliary blade rises. The forward and reverse motor can be powered by a battery, and the battery can be charged by wireless induction. Induction charging belongs to the prior art and will not be described in detail. Because the sheet body, the core shaft and the auxiliary blade all rotate synchronously, the forward and reverse motor is arranged in the core shaft, and it is relatively static with the auxiliary blade.

[0030] Example 4

[0031] like Figure 5As shown, a blade comprises a core shaft 1 and a blade body 2, wherein the blade body 2 is evenly distributed around the core shaft 1 and the tail end of the blade body is fixedly connected to the core shaft 1, and the head end edge of the blade body 2 is provided with an auxiliary blade 3, and the equidistant surface is the shape corresponding to the orthographic projection of the auxiliary blade 3 on the blade body or / and the design curved surface extending from the edge of the blade body.

[0032] The technical solution of the present invention is not limited to the above-mentioned specific embodiments. All technical variations made according to the technical solution of the present invention fall within the protection scope of the present invention.

Claims

1. A blade, comprising a core shaft and a blade body, wherein the blade body is evenly distributed around the core shaft in the circumferential direction and the tail end of the blade body is fixedly connected to the core shaft, characterized in that: A secondary blade is provided on the reverse side of at least one of the other three sides of the sheet body, and the secondary blade is shaped as an equidistant surface of the corresponding sheet body portion; both ends of the secondary blade are connected to the sheet body through a bracket; The isotropic surface is the shape corresponding to the orthographic projection of the auxiliary blade on the sheet body or / and the design curved surface extending from the edge of the sheet body; The bracket is a folding bracket, and the bottom and top of the two brackets are respectively hinged with the sheet body and the auxiliary blade for rotation. A fixed pulley is respectively arranged at the front and rear of the bracket on the sheet body, and a forward and reverse motor is arranged in the core shaft. A wire wheel is arranged on the rotating shaft, and a winding wire is arranged on the wire wheel. Wires are output at both ends of the winding wire, one of which is fixedly connected to the auxiliary blade through a fixed pulley, and the other end is fixedly connected to the auxiliary blade through another fixed pulley. A limit block is arranged on the sheet body to limit the bracket to a vertical position when the winding wire pulls the auxiliary blade to rise, and a positioning block is arranged on the upper part of the bracket to keep the auxiliary blade parallel when the auxiliary blade is raised.

2. A blade according to claim 1, characterized in that: The auxiliary blade is arranged at one end of the sheet body away from the core shaft in the radial direction, and the two ends of the auxiliary blade in the circumferential direction are fixedly connected to the corresponding sheet body through a bracket.

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