Blade assembly and wind power generation device

Abstract

The embodiment of the utility model relates to the technical field of wind power generation, in particular to a blade assembly which comprises a mounting shaft and a blade, the mounting shaft is rotationally connected to external equipment, the blade is connected to the mounting shaft, and the blade is provided with a first surface and a second surface which are oppositely arranged in the circumferential direction of the mounting shaft. The blade assembly comprises a first surface and a second surface, the first surface is sunken towards the second surface, a stress groove is formed in the first surface, and the stress groove is used for bearing fluid impact, so that the blade assembly rotates relative to external equipment. In this way, the blade assembly can effectively capture kinetic energy of fluid, and the mechanical strength of the blade assembly is high.

Description

Technical Field

[0001] The utility model relates to the technical field of wind power generation, in particular to a blade assembly and a wind power generation device. Background Art

[0002] Wind power generation is the conversion of wind energy into electrical energy. Generally, a wind power generation device includes a generator and a blade assembly, which is rotatably connected to the generator. The blade assembly is acted on by a fluid to rotate relative to the generator, thereby generating electricity. The blade assembly includes a blade, a connecting rod and a mounting shaft, the mounting shaft is respectively connected to one end of the generator and the connecting rod, and the blade is fixed to the other end of the connecting rod.

[0003] However, in the process of implementing the embodiment of the utility model, the inventors found that the structural mode of connecting the mounting shaft and the blades respectively through the connecting rod has unstable mechanical strength and large energy loss. Utility Model Content

[0004] The embodiment of the utility model provides a blade assembly, which can effectively capture the kinetic energy of the fluid and has high mechanical strength.

[0005] In order to solve the above technical problems, a technical solution adopted by the utility model is: to provide a blade assembly, including a mounting shaft, rotatably connected to an external device; a blade, connected to the mounting shaft, and the blade has a first surface and a second surface relatively arranged along the circumference of the mounting shaft, the first surface is recessed toward the second surface, and a stress groove is formed on the first surface, and the stress groove is used to withstand fluid impact, so that the blade assembly rotates relative to the external device.

[0006] Optionally, along the direction from the notch of the stress-bearing groove to the bottom wall, the cross-sectional area of ​​the stress-bearing groove gradually decreases.

[0007] Optionally, along the radial direction of the mounting shaft, the stress groove has a first guide wall and a second guide wall that are relatively arranged, the first guide wall and the second guide wall are respectively inclined toward the center of the stress groove, and the first guide wall and the second guide wall are both used to guide fluid flow.

[0008] Optionally, the first guide wall is closer to the mounting axis than the second guide wall, and the line distance from the bottom wall of the force-bearing groove along the first guide wall to the notch of the force-bearing groove is greater than the line distance from the bottom wall of the force-bearing groove along the second guide wall to the notch of the force-bearing groove.

[0009] Optionally, the first guide wall is provided with a drainage hole, and the drainage hole is used for allowing the fluid to be discharged after impacting the wall surface of the stress groove.

[0010] Optionally, the mounting shaft includes a mounting portion and a connecting portion, the blade is connected to the mounting portion, one end of the connecting portion is connected to the mounting portion, and the other end of the connecting portion is connected to an external device. Along the mounting portion toward the connecting portion, the cross-section of the mounting portion is larger than the connecting portion, so that a step is formed between the mounting portion and the connecting portion, and the side wall of the force groove is abutted against the step.

[0011] Optionally, the blade assembly further includes a limiting member, wherein the limiting member is connected to the mounting shaft, the mounting shaft and the limiting member together enclose a limiting groove, the blade is inserted into the limiting groove, and the limiting groove is used to limit the blade.

[0012] Optionally, the limiting member includes a straight portion and a bent portion, one end of the straight portion is connected to the mounting shaft, the other end of the straight portion is connected to the bent portion, the bent portion is arranged opposite to the mounting shaft, and the straight portion, the bent portion and the mounting shaft together enclose the limiting groove.

[0013] Optionally, the mounting portion is provided with a screw hole; the blade is provided with a through hole; the blade assembly further comprises a bolt, and the bolt passes through the through hole and is screwed into the screw hole.

[0014] In order to solve the above technical problems, a technical solution adopted by the utility model is: to provide a wind power generation device, including a generator, a mounting frame and the above-mentioned blade assembly, the mounting frame is connected to the generator, the mounting frame is provided with a rolling groove and a flow port, the flow port is connected to the rolling groove, the blade assembly is arranged in the rolling groove, and the flow port is used for fluid to flow in and impact the force groove.

[0015] The beneficial effects of the embodiments of the present application are: compared with the prior art, the problem of insufficient mechanical strength of the connection between the blade and the mounting shaft is solved by directly connecting the blade to the mounting shaft. In addition, the first surface is recessed toward the second surface, and a force groove is formed on the first surface. When the fluid impacts the wall of the force groove, the wall of the force groove bears the impact of the fluid, so that the blade assembly rotates relative to the external device. On the one hand, the force groove can increase the force area of ​​the fluid. On the other hand, the force groove can also capture the kinetic energy of the fluid, improve the conversion rate of the kinetic energy of the fluid into mechanical energy, and further reduce the energy loss of the fluid. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the drawings without paying creative work.

[0017] Figure 1 is a view of a prior art blade assembly;

[0018] Figure 2 It is a view of a blade assembly provided by an embodiment of the utility model;

[0019] Figure 3 This is a view of the blade and the mounting shaft in an exploded state provided by an embodiment of the utility model;

[0020] Figure 4 This is another view of the blade and the mounting shaft in an exploded state provided by the embodiment of the utility model;

[0021] Figure 5 The utility model embodiment provides Figure 4 A magnified view of the A area;

[0022] Figure 6 This is a view of a blade assembly installed on a mounting frame provided by an embodiment of the utility model.

[0023] Reference numerals:

[0024] 100, blade assembly; 200, mounting frame; 200a, rolling groove; 200b, inlet; 200c, exhaust hole;

[0025] 10, blade; 10a, first surface; 10b, second surface; 10c, force groove; 10d, first guide wall; 10e, second guide wall; 10f, drainage hole; 10g, through hole;

[0026] 20, mounting shaft; 201, mounting portion; 202, connecting portion; 20a, step; 201a, screw hole;

[0027] 30. Limiting member; 301. Straight portion; 302. Bending portion; 30a. Limiting groove. DETAILED DESCRIPTION

[0028] In order to facilitate the understanding of the utility model, the utility model is described in more detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that when an element is described as "fixed to" another element, it can be directly on the other element, or there can be one or more centered elements therebetween. When an element is described as "connected to" another element, it can be directly connected to the other element, or there can be one or more centered elements therebetween. The terms "vertical", "horizontal", "left", "right" and similar expressions used in this specification are for illustrative purposes only.

[0029] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by technicians in the technical field of the present invention. The terms used in this specification are only for the purpose of describing specific embodiments and are not used to limit the present invention. The term "and / or" used in this specification includes any and all combinations of one or more related listed items.

[0030] See also Figure 1 The blade assembly a100 in the prior art includes a blade a10, a mounting shaft a20 and a connecting rod a30. The mounting shaft a20 is cylindrical, and the mounting shaft a20 is rotatably connected to an external device, such as a generator of a wind power generation device. The connecting rod a30 is in the shape of an elongated strip, and the blade a10 is in the shape of a plate. One end of the connecting rod a30 is connected to the mounting shaft a20, and the other end of the connecting rod a30 is connected to the blade a10. It can be understood that the blade a10 and the mounting shaft a20 are connected by the connecting rod a30, and the connecting rod a30 is in the shape of an elongated strip, so that the mechanical strength between the blade a10 and the mounting shaft a20 is very poor, and the connecting rod a30 is prone to bending and deformation, and the blade a10 is offset, that is, the blade a10 is not in the preset position.

[0031] The blade a10 has a first surface a10a and a second surface a10b that are relatively arranged. The first surface a10a and the second surface a10b are both planes. The first surface a10a is tangent to the circumferential direction of the mounting axis a20 in the direction toward the second surface a10b. When the fluid acts on the first surface a10a, it can drive the blade assembly a100 to rotate relative to the external device, thereby realizing power generation. However, the plate-shaped blade a10 has low efficiency in capturing the kinetic energy of the fluid, that is, the conversion rate of the kinetic energy of the fluid into mechanical energy is low.

[0032] See also Figure 2 The present application provides a blade assembly 100, which includes a blade 10 and a mounting shaft 20. The mounting shaft 20 is rotatably connected to an external device, such as a generator of a wind power generation device, and the blade 10 is connected to the mounting shaft 20. The fluid acts on the blade 10 to convert the kinetic energy of the fluid into the mechanical energy of the blade assembly 100, that is, the blade assembly 100 rotates relative to the external device. The blade 10 is directly connected to the mounting shaft 20, which solves the problem of insufficient mechanical strength of the connection between the blade 10 and the mounting shaft 20.

[0033] For blade 10 above, see Figure 2The blade 10 has a first surface 10a and a second surface 10b arranged opposite to each other along the circumference of the mounting shaft 20. The first surface 10a is recessed toward the second surface 10b, and a stress groove 10c is formed on the first surface 10a. When the fluid impacts the wall of the stress groove 10c, the wall of the stress groove 10c bears the impact of the fluid, so that the blade assembly 100 rotates relative to the external device. Compared with the prior art, on the one hand, the stress groove 10c can increase the stress area of ​​the fluid, and on the other hand, the stress groove 10c can also capture the kinetic energy of the fluid, improve the conversion rate of the kinetic energy of the fluid into mechanical energy, and further reduce the energy loss of the fluid.

[0034] For the stress-bearing groove 10c, the cross-sectional area of ​​the stress-bearing groove 10c gradually decreases from the groove opening to the bottom wall. The stress-bearing groove 10c not only has a good function of capturing the kinetic energy of the fluid, but also has a good function of guiding the fluid to be discharged from the outside.

[0035] Optionally, along the radial direction of the mounting shaft 20, the stress groove 10c has a first guide wall 10d and a second guide wall 10e that are arranged opposite to each other, and the first guide wall 10d and the second guide wall 10e are respectively inclined toward the center of the stress groove 10c. When the fluid impacts the wall surface of the stress groove 10c, the first guide wall 10d and the second guide wall 10e respectively guide part of the fluid to be discharged out of the stress groove 10c. It can be understood that the fluid enters the stress groove 10c from the notch center of the stress groove 10c and then impacts the wall surface of the stress groove 10c, and the fluid is discharged to the outside along the side wall of the stress groove 10c, that is, an inflow space is formed from the notch center of the stress groove 10c to the bottom wall of the stress groove 10c, and the inflow space is used for the fluid to flow into the stress groove 10c, and an outflow space is formed along the side wall edge of the stress groove 10c, and the outflow space is used for the fluid to be discharged to the outside.

[0036] In some embodiments, the first guide wall 10d is closer to the installation axis 20 relative to the second guide wall 10e, and the line distance from the bottom wall of the force-bearing groove 10c extending along the first guide wall 10d to the slot opening of the force-bearing groove 10c is greater than the line distance from the bottom wall of the force-bearing groove 10c extending along the second guide wall 10e to the slot opening of the force-bearing groove 10c.

[0037] In some embodiments, the first guide wall 10d is provided with a drainage hole 10f, which is located at one end of the first guide wall 10d close to the mounting shaft 20, and is waist-shaped, with the length direction of the drainage hole 10f extending from the mounting shaft 20 toward the blade 10. When the fluid is discharged to the outside along the side wall of the force-bearing groove 10c, the drainage hole 10f can allow the fluid to impact the wall surface of the force-bearing groove 10c and then be discharged.

[0038] In some embodiments, the first guide wall 10d is in an arc shape or a straight shape, and the second guide wall 10e is in an arc shape or a straight shape.

[0039] In some embodiments, the stress groove 10c also has a third guide wall and a fourth guide wall arranged relatively to each other, the first guide wall 10d, the third guide wall, the second guide wall 10e and the fourth guide wall are connected end to end to form the side wall of the stress groove 10c, the connecting distance between the third guide wall and the mounting axis 20 is equal to the connecting distance between the fourth guide wall and the mounting axis 20, and the third guide wall and the fourth guide wall both have the function of guiding the fluid to discharge from the outside.

[0040] For mounting shaft 20 above, see Figure 3 Combination Figure 4 The mounting shaft 20 includes a mounting portion 201 and a connecting portion 202. The blade 10 is connected to the mounting portion 201, one end of the connecting portion 202 is connected to the mounting portion 201, and the other end of the connecting portion 202 is connected to an external device. From the mounting portion 201 to the connecting portion 202, the cross section of the mounting portion 201 is larger than the connecting portion 202, so that a step 20a is formed between the mounting portion 201 and the connecting portion 202, and the side wall of the force groove 10c is against the step 20a. The step 20a has a limiting effect on the blade 10, reducing the displacement of the blade 10 relative to the mounting shaft 20.

[0041] In some embodiments, there are two connecting parts 202, which are arranged opposite to the mounting part 201, and the mounting part 201 and the two connecting parts 202 form two steps 20a, the third guide wall abuts against one step 20a, and the fourth guide wall abuts against the other step 20a.

[0042] In some embodiments, the mounting portion 201 is in a square shape along the direction from the mounting portion 201 to the connecting portion 202, and the number of blades 10 corresponds to the number of sides of the square, that is, one blade 10 is connected to the surface formed by any two adjacent sides of the square. Exemplarily, the number of blades 10 is four, the number of sides of the square is four, and one blade 10 is connected to the surface formed by any two adjacent sides of the square.

[0043] For the connection between the blade 10 and the mounting shaft 20, the mounting portion 201 is provided with a screw hole 201a, the blade 10 is provided with a through hole 10g, and the blade assembly 100 further includes a bolt, which passes through the through hole 10g and is screwed to the screw hole 201a, thereby realizing a detachable connection between the blade 10 and the mounting shaft 20, which is convenient for transportation and maintenance. Optionally, the connection between the blade 10 and the mounting shaft 20 is riveting or welding, as long as the blade 10 can be fixed to the mounting shaft 20.

[0044] In some embodiments, see Figure 5The blade assembly 100 further includes a stopper 30, which is connected to the mounting shaft 20. The mounting shaft 20 and the stopper 30 together enclose a stopper groove 30a. The blade 10 is inserted into the stopper groove 30a, and the blade 10 is adapted to the stopper groove 30a. The stopper groove 30a is used to limit the position of the blade 10. Specifically, the stopper 30 includes a straight portion 301 and a bent portion 302. One end of the straight portion 301 is connected to the mounting shaft 20, and the other end of the straight portion 301 is connected to the bent portion 302. The bent portion 302 is arranged opposite to the mounting shaft 20. The straight portion 301, the bent portion 302 and the mounting shaft 20 together enclose a stopper groove 30a.

[0045] In the embodiment of the present application, the mounting shaft 20 and the blade 10 are installed, the mounting shaft 20 is rotatably connected to an external device, the blade 10 is connected to the mounting shaft 20, and the blade 10 has a first surface 10a and a second surface 10b that are relatively arranged along the circumference of the mounting shaft 20, the first surface 10a is recessed toward the second surface 10b, and a stress groove 10c is formed on the first surface 10a, the stress groove 10c is used to withstand fluid impact, so that the blade assembly 100 rotates relative to the external device. Compared with the prior art, the blade 10 is directly connected to the mounting shaft 20, thereby solving the problem of insufficient mechanical strength of the connection between the blade 10 and the mounting shaft 20. In addition, the first surface 10a is recessed toward the second surface 10b, and a stress groove 10c is formed on the first surface 10a. When the fluid impacts the wall of the stress groove 10c, the wall of the stress groove 10c bears the impact of the fluid, so that the blade assembly 100 rotates relative to the external device. On the one hand, the stress groove 10c can increase the stress area of ​​the fluid. On the other hand, the stress groove 10c can also capture the kinetic energy of the fluid, thereby improving the conversion rate of the kinetic energy of the fluid into mechanical energy, and further reducing the energy loss of the fluid.

[0046] The utility model also provides an embodiment of a wind power generation device, see Figure 6 The wind power generation device includes a generator, a mounting frame 200 and the above-mentioned blade assembly 100. The mounting frame 200 is connected to the generator. The mounting frame 200 is provided with a rolling groove 200a and a flow port 200b. The flow port 200b is connected to the rolling groove 200a. The blade assembly 100 is arranged in the rolling groove 200a. The flow port 200b is used for fluid to flow into and then impact the stress groove 10c.

[0047] In some embodiments, the rolling groove 200a is cylindrical, and has a fan-shaped notch to form the above-mentioned flow inlet 200b.

[0048] In some embodiments, the mounting frame 200 is provided with a plurality of exhaust holes 200c, and the exhaust holes 200c are adjacent to the inlet 200b. When the fluid impacts the wall of the stress groove 10c, the surface away from the stress groove 10c will push the air to flow, and the exhaust holes 200c can provide good air discharge, reduce the resistance of the surface away from the stress groove 10c to push the air, and further reduce the kinetic energy loss of the fluid impacting the stress groove 10c. Optionally, the hole cross-section of the exhaust hole 200c gradually increases along the direction away from the inlet 200b.

[0049] The specific structure and function of the blade assembly 100 may refer to the above embodiments, which will not be described in detail here.

[0050] It should be noted that the preferred embodiments of the utility model are given in the specification and drawings of the utility model, but the utility model can be implemented in many different forms and is not limited to the embodiments described in the specification. These embodiments are not used as additional restrictions on the content of the utility model. The purpose of providing these embodiments is to make the understanding of the disclosure of the utility model more thorough and comprehensive. In addition, the above-mentioned technical features continue to be combined with each other to form various embodiments not listed above, which are all regarded as the scope of the description of the utility model; further, for ordinary technicians in this field, they can be improved or transformed according to the above description, and all these improvements and transformations should belong to the scope of protection of the claims attached to the utility model.

Claims

1. A blade assembly, characterized in that: include: Install the shaft and rotatably connect it to the external equipment; The blade is connected to the mounting shaft, and the blade has a first surface and a second surface arranged opposite to each other along the circumference of the mounting shaft, the first surface is recessed toward the second surface, and a stress groove is formed on the first surface, and the stress groove is used to withstand fluid impact, so that the blade assembly rotates relative to the external device.

2. The blade assembly according to claim 1, characterized in that: Along the direction from the notch of the stress-bearing groove to the bottom wall, the cross-sectional area of ​​the stress-bearing groove gradually decreases.

3. The blade assembly according to claim 2, characterized in that: Along the radial direction of the mounting shaft, the stress groove has a first guide wall and a second guide wall that are arranged opposite to each other. The first guide wall and the second guide wall are respectively inclined toward the center of the stress groove. The first guide wall and the second guide wall are both used to guide the flow of fluid.

4. The blade assembly according to claim 3, characterized in that: The first guide wall is closer to the mounting axis than the second guide wall, and the line distance from the bottom wall of the stress-bearing groove along the first guide wall to the notch of the stress-bearing groove is greater than the line distance from the bottom wall of the stress-bearing groove along the second guide wall to the notch of the stress-bearing groove.

5. The blade assembly according to claim 4, characterized in that: The first guide wall is provided with a drainage hole, and the drainage hole is used for the fluid to be discharged after impacting the wall surface of the stress groove.

6. The blade assembly according to any one of claims 1 to 5, characterized in that: The mounting shaft includes a mounting portion and a connecting portion, the blade is connected to the mounting portion, one end of the connecting portion is connected to the mounting portion, and the other end of the connecting portion is connected to an external device. Along the mounting portion toward the connecting portion, the cross-section of the mounting portion is larger than the connecting portion, so that a step is formed between the mounting portion and the connecting portion, and the side wall of the force-bearing groove is abutted against the step.

7. The blade assembly according to claim 6, characterized in that: The blade assembly also includes a limiting member, which is connected to the mounting shaft. The mounting shaft and the limiting member together enclose a limiting groove, and the blade is inserted into the limiting groove, and the limiting groove is used to limit the blade.

8. The blade assembly according to claim 7, characterized in that: The limiting member includes a straight portion and a bent portion, one end of the straight portion is connected to the mounting shaft, the other end of the straight portion is connected to the bent portion, the bent portion is arranged opposite to the mounting shaft, and the straight portion, the bent portion and the mounting shaft together enclose the limiting groove.

9. The blade assembly according to claim 6, characterized in that: The mounting portion is provided with a screw hole; The blade is provided with a through hole; The blade assembly also includes a bolt, which passes through the through hole and is screwed into the screw hole.

10. A wind power generation device, characterized in that: It includes a generator, a mounting frame and a blade assembly as described in any one of claims 1 to 9, wherein the mounting frame is connected to the generator, the mounting frame is provided with a rolling groove and a flow port, the flow port is connected to the rolling groove, the blade assembly is arranged in the rolling groove, and the flow port is used for fluid to flow in and impact the stress groove.

Images