Stable forward-leaning wind wheel and fan

Abstract

The utility model discloses a stable forward-leaning wind wheel and a fan. The stable forward-leaning wind wheel comprises a front ring, a rear cover and a plurality of blades. The two opposite ends of each blade are provided with a first insertion block and a second insertion block respectively, the front ring is provided with a first insertion groove corresponding to the first insertion block, and the rear cover is provided with a second insertion groove corresponding to the second insertion block. The two first positioning protruding blocks are located on the two opposite sides of the first inserting groove respectively, the first inserting block is riveted between the two first positioning protruding blocks, and the right-angle sides of the two first positioning protruding blocks are clamped to the two opposite sides of the first inserting block respectively. The two second positioning protruding blocks are located on the two opposite sides of the second inserting groove respectively, the second inserting block is riveted between the two second positioning protruding blocks, and the right-angle sides of the two second positioning protruding blocks are clamped to the two opposite sides of the second inserting block respectively. According to the utility model, the contact area between the first insertion block and the front ring can be effectively increased, the contact area between the second insertion block and the rear cover is increased, the locking firmness of the blades in the radial direction can be effectively improved, and the application range is wide.

Description

Technical Field

[0001] The utility model relates to the field of wind turbine components, in particular to a stable forward-inclined wind wheel and a wind turbine. Background Art

[0002] In power science and energy science, a wind wheel refers to a wind turbine component that realizes the conversion between wind energy and mechanical energy. The wind wheel is one of the key components of a wind turbine, and its performance directly affects the wind energy utilization efficiency of the wind turbine and the loads borne by the unit.

[0003] A forward-inclined wind wheel refers to a wind wheel with blades in an inclined shape, where the blades are inclined towards the air inlet direction, and it can achieve the operation effect of high static pressure efficiency. In related technologies, the wind wheel mainly includes blades and a housing. The blades are often fixed to the housing by general plug welding methods. The load-bearing capacity of the forward-inclined wind wheel is weak. During operation, the wind resistance pressure on the blades is relatively large, and the wind wheel is prone to jitter during operation, and even the blades may fall off, resulting in unstable wind wheel structure and poor working stability. Summary of the Utility Model

[0004] The utility model aims to at least solve one of the technical problems existing in the prior art. For this purpose, the utility model provides a stable forward-inclined wind wheel and a wind turbine, in which the connection structures between the blades and the front ring and the rear cover are stable and firm, and the working stability during operation is good.

[0005] A stable forward-inclined wind wheel according to an embodiment of the first aspect of the utility model includes a front ring, a rear cover, and a plurality of blades. The front ring is circular, and all the blades are evenly distributed between the rear cover and the front ring, and each blade is parallel to the axis of the front ring;

[0006] First insertion blocks and second insertion blocks are respectively provided at opposite ends of the blade. The front ring is provided with a plurality of first slots respectively corresponding to the first insertion blocks, and the first insertion blocks are plugged and connected into the first slots. The rear cover is provided with a plurality of second slots respectively corresponding to the second insertion blocks, and the second insertion blocks are plugged and connected into the second slots. A first riveting positioning member is provided on one side of each first slot away from the rear cover, and a second riveting positioning member is provided on one side of each second slot away from the front ring;

[0007] The first riveting positioning member includes two first positioning bumps, which are respectively located on opposite sides of the first slot. The first insertion block is riveted between the two first positioning bumps. Along the direction perpendicular to the extension of the first slot, the cross-sectional shape of the first positioning bump is a right triangle, and the right-angle sides of the two first positioning bumps respectively clamp on opposite sides of the first insertion block;

[0008] The second riveting positioning member includes two second positioning bumps, which are respectively located on opposite sides of the second slot. The second insert block is riveted between the two second positioning bumps. Along the direction perpendicular to the extension of the second slot, the cross-sectional shape of the second positioning bump is a right triangle, and the right-angle sides of the two second positioning bumps are respectively clamped on opposite sides of the second insert block.

[0009] In this embodiment, the projection of the blade on the front ring protrudes from the inner side of the front ring.

[0010] In this embodiment, the length of the first insert block is greater than that of the second insert block. One first insert block is provided on one side of each blade close to the front ring, and two second insert blocks are provided on one side of each blade close to the rear cover.

[0011] In this embodiment, the blade, the first insert block and the second insert block are of an integrally formed structure, the front ring and the first positioning bump are of an integrally formed structure, and the rear cover and the second positioning bump are of an integrally formed structure.

[0012] In this embodiment, the blade, the front ring and the rear cover are all stainless steel structural parts.

[0013] In this embodiment, the end angle of the blade protruding from the inner side of the front ring is provided with a round chamfer.

[0014] In this embodiment, the rear cover includes an inner ring plate, a reinforcing plate and an outer ring plate which are integrally formed. The reinforcing plate is located on the plane on one side of the outer ring plate. The outer ring plate is annularly connected to the outer edge of the reinforcing plate, and the reinforcing plate is annularly connected to the outer edge of the inner ring plate.

[0015] In this embodiment, the inner ring plate and the outer ring plate are located in the same plane.

[0016] A blower according to the second aspect embodiment of the present invention includes the stable forward-inclined wind wheel of the first aspect embodiment, and the outlet angle of the blade is greater than a right angle.

[0017] The embodiments of the present invention at least have the following beneficial effects:

[0018] By inserting the first insertion block and the second insertion block into the first slot and the second slot respectively, and cooperating with the first riveting positioning member and the second riveting positioning member to clamp and rivet the first insertion block and the second insertion block on both sides of the blade respectively, a double fixation effect can be formed, and the fixation effect is stable and firm. In particular, the cross-sectional shapes of the first positioning convex block and the second positioning convex block are right-angled triangles, and the right-angled sides of the first positioning convex block and the second positioning convex block are respectively clamped on the sides of the first insertion block and the second insertion block, which can effectively increase the radial contact area between the first insertion block and the front ring, and at the same time increase the radial contact area between the second insertion block and the rear cover. According to the direction of the resistance received during the operation of the wind wheel, the firmness of the blade in radial locking can be effectively improved, the load capacity of the present forward-inclined wind wheel can be effectively improved, and under the action of high-speed rotation or large wind pressure, the blade can be effectively prevented from shaking or even falling off. The maintenance cost is low and the safety performance is good. The structure of the present forward-inclined wind wheel is stable and firm, and the applicable range is wide. In particular, it can effectively meet the working requirements of large flow and large pressure when the blade is forward-inclined; in addition, the blade is firmly connected between the front ring and the rear cover, which can effectively reduce the wind resistance change and energy loss caused by the loosening of the blade, and can effectively improve the stability of the operation action, so that the wind wheel can maintain efficient operation within a wider wind speed range. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present utility model will become apparent and be readily understood from the following description of the embodiments in conjunction with the accompanying drawings, wherein:

[0020] Figure 1 is a three-dimensional structural schematic diagram of the stable forward-inclined wind wheel according to the embodiment of the present utility model;

[0021] Figure 2 is a three-dimensional structural schematic diagram of the stable forward-inclined wind wheel according to the embodiment of the present utility model from another perspective;

[0022] Figure 3 is an exploded structural schematic diagram of the stable forward-inclined wind wheel according to the embodiment of the present utility model;

[0023] Figure 4 is Figure 3 a partial enlarged structural schematic diagram of A in

[0024] Figure 5 is an exploded structural schematic diagram of the stable forward-inclined wind wheel according to the embodiment of the present utility model from another perspective;

[0025] Figure 6 is Figure 5 a partial enlarged structural schematic diagram of B in

[0026] Reference numerals:

[0027] Front ring 100, first slot 110, first riveting positioning part 120, first positioning bump 121;

[0028] Rear cover 200, inner ring plate 201, reinforcement plate 202, outer ring plate 203, second slot 210, second riveting positioning part 220, second positioning bump 221;

[0029] Blade 300, round chamfer 301, first insertion block 310, second insertion block 320. Specific implementation mode

[0030] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, in which the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present invention, and should not be construed as a limitation to the present invention.

[0031] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as up, down, left, right, front, back, etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0032] In the description of the present invention, if the first and second are described only for the purpose of distinguishing technical features, they should not be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence of the indicated technical features.

[0033] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installation, connection, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific content of the technical solution.

[0034] The wind wheel is one of the key components of a wind turbine. In electromechanics and energy science, the wind wheel refers to the component of a wind turbine that realizes the conversion between wind energy and mechanical energy, and its performance directly affects the wind energy utilization efficiency of the wind turbine and the loads borne by the unit. The forward-inclined wind wheel refers to a wind wheel with inclined blades, and the blades are inclined towards the direction of the air inlet, which can achieve the operating effect of high static pressure efficiency. In the related art, the wind wheel mainly includes blades and a housing, and the blades are often fixed to the housing by general plug welding methods. The forward-inclined wind wheel has a weak load capacity, the wind resistance pressure on the blades is relatively large during operation, and it is easy to vibrate during operation, and even the blades may fall off, resulting in unstable wind wheel structure and poor working stability.

[0035] In wind power generation, aerospace, automotive cooling fans, and other devices that require wind power for driving, the wind wheel, as a key component, its stability and efficiency directly affect the performance of the overall device. Traditional wind wheel designs often have problems such as complex structures, cumbersome assembly, and unreliable blade fixation. Especially in high wind speed or long-term operating environments, these problems are particularly prominent. Specifically, the blades of traditional wind wheels are usually fixed between the front ring and the rear cover by bolts, welding, or direct insertion. These methods either increase the assembly difficulty and cost, or cause the blades to loosen or fall off due to insecure fixation, thereby affecting the rotational balance and efficiency of the wind wheel. In addition, traditional fixation methods often struggle to withstand the impact under strong winds, resulting in damage to the wind wheel or even safety accidents.

[0036] The following refers to the attached Figure 1 to the attached Figure 6 to describe the stable forward-tilt wind wheel and the fan of the embodiment of the present utility model, where the connection structures between the blades and the front ring and the rear cover are stable and firm, and the stability during operation is good.

[0037] Referring to Figures 1 to 6 According to an embodiment of the first aspect of the present utility model, a stable forward-tilt wind wheel includes a front ring 100, a rear cover 200, and a plurality of blades 300. The front ring 100 is circular. All the blades 300 are evenly distributed between the rear cover 200 and the front ring 100, that is, the front ring 100 and the rear cover 200 are provided at opposite ends of the blades 300. The rear cover 200 and the front ring 100 are coaxially arranged opposite to each other, that is, the axis of the front ring 100 and the axis of the rear cover 200 are coaxial. Each blade 300 is parallel to the axis of the front ring 100 to achieve an air flow direction of axial air intake and radial air outlet. The outlet angle of each blade 300 is greater than ninety degrees, that is, each blade 300 is forward-tilted. Among them, the outlet angle, also known as the outlet inclination angle, refers to the inclination angle at the outlet of the blade 300. Specifically, it is the angle between the extension line outside the blade 300 and the reverse tangent of the rotation direction of the blade 300 at this point. Compared with the driving rotation direction, by setting the blade 300 to be forward-tilted, the wind wheel is applied as forward-tilted.

[0038] At opposite ends of each blade 300, a first insertion block 310 and a second insertion block 320 are respectively provided. The front ring 100 is provided with a number of first slots 110 corresponding to the respective first insertion blocks 310. The number of the first slots 110 is equal to that of the first insertion blocks 310. The first slots 110 penetrate through opposite surfaces of the front ring 100. The first insertion blocks 310 are plugged and connected into the first slots 110. The rear cover 200 is provided with a number of second slots 210 corresponding to the respective second insertion blocks 320. The number of the second slots 210 is equal to that of the second insertion blocks 320. The second slots 210 penetrate through opposite surfaces of the rear cover 200. The second insertion blocks 320 are plugged and connected into the second slots 210. On one side of each first slot 110 away from the rear cover 200, a first riveting positioning member 120 is provided. On one side of each second slot 210 away from the front ring 100, a second riveting positioning member 220 is provided;

[0039] The first riveting positioning member 120 includes two first positioning bumps 121. The two first positioning bumps 121 are respectively located on opposite sides of the first slot 110. The first insertion block 310 is riveted between the two first positioning bumps 121. Specifically, the riveting between the first insertion block 310 and the two first positioning bumps 121 on both sides is realized by hot riveting methods such as ultrasonic riveting. Along the direction perpendicular to the extension of the first slot 110, the cross-sectional shape of the first positioning bump 121 is a first right triangle. The right-angle sides of the two first positioning bumps 121 respectively clamp on opposite sides of the first insertion block 310, that is, the right-angle sides of the two first right triangles respectively closely clamp on opposite sides of the first insertion block 310. The other right-angle side of the first right triangle is connected to the front ring 100. Along the radial direction of the wind wheel, by the right-angle sides of the two first positioning bumps 121 respectively clamping on opposite sides of the first insertion block 310, in view of the rotation direction of the wind wheel and the resistance direction of the blade 300, in addition to abutting and positioning with the side wall of the first slot 110, the first insertion block 310 can also increase the radial contact area between the first insertion block 310 and the front ring 100 by using the first positioning bumps 121, and can specifically enhance the stability of the connection structure between the first insertion block 310 and the front ring 100. By setting the first positioning bump 121 as a first right triangle, the firmness of positioning the first insertion block 310 can be specifically strengthened, and at the same time, the input cost of materials can be effectively reduced;

[0040] The second riveting positioning member 220 includes two second positioning bumps 221, which are respectively located on opposite sides of the second slot 210. The second insertion block 320 is riveted between the two second positioning bumps 221. Specifically, the riveting between the second insertion block 320 and the second positioning bumps 221 on both sides is achieved by hot riveting methods such as ultrasonic riveting. Along the direction perpendicular to the extension of the second slot 210, the cross-sectional shape of the second positioning bump 221 is a second right triangle. The right-angle sides of the two second positioning bumps 221 are respectively clamped on opposite sides of the second insertion block 320, that is, the right-angle sides of the two second right triangles are respectively closely clamped on opposite sides of the second insertion block 320. The other right-angle side of the second right triangle is connected to the rear cover 200. Along the radial direction of the wind wheel, by clamping the right-angle sides of the two second positioning bumps 221 on opposite sides of the second insertion block 320 respectively, in view of the rotation direction of the wind wheel and the resistance direction of the blade 300, in addition to abutting and positioning against the side wall of the second slot 210, the second insertion block 320 can also increase the radial contact area between the second insertion block 320 and the rear cover 200 by using the second positioning bumps 221, which can specifically enhance the stability of the connection structure between the second insertion block 320 and the rear cover 200. By setting the second positioning bump 221 as a second right triangle, the firmness of positioning the second insertion block 320 can be specifically strengthened, and at the same time, the input cost of materials can be effectively reduced.

[0041] By respectively inserting the first insertion block 310 and the second insertion block 320 into the first slot 110 and the second slot 210, and cooperating with the first riveting positioning member 120 and the second riveting positioning member 220 to respectively clamp and rivet the first insertion block 310 and the second insertion block 320 on both sides of the blade 300, a double fixation effect can be formed, and the fixation effect is stable and firm. Especially, the cross-sectional shapes of the first positioning bump 121 and the second positioning bump 221 are set as right triangles, and the right-angle sides of the first positioning bump 121 and the second positioning bump 221 are respectively clamped on the sides of the first insertion block 310 and the second insertion block 320, which can effectively increase the radial contact area between the first insertion block 310 and the front ring 100, and at the same time increase the radial contact area between the second insertion block 320 and the rear cover 200. In view of the resistance direction when the wind wheel works, the firmness of the blade 300 in radial locking can be effectively improved, the load capacity of the present forward-inclined wind wheel can be effectively improved, and under the action of high-speed rotation or large wind pressure, the blade 300 can be effectively prevented from shaking or even falling off, the maintenance and replacement frequency caused by the loosening or falling off of the blade 300 can be significantly reduced, the maintenance cost can be effectively saved, the maintenance cost is low, and the safety performance is good. The structure of the present forward-inclined wind wheel is stable and firm, can adapt to application requirements such as strong wind and high speed, has a wide adaptation range, especially can effectively adapt to the large-flow and large-pressure working requirements when the blade 300 is forward-inclined;

[0042] In addition, the blade 300 is firmly connected between the front ring 100 and the rear cover 200, which can effectively reduce the wind resistance change and energy loss caused by the loosening of the blade 300, effectively improve the stability of the operating motion, enable the wind turbine to maintain efficient operation within a wider wind speed range. Moreover, compared with the traditional bolt fixation or direct welding methods, the method of riveting after plug-in positioning can simplify the assembly steps, improve the assembly efficiency and reduce the skill requirements for operators.

[0043] It can be understood that when projected along the direction parallel to the axis of the front ring 100, the projection of the blade 300 on the front ring 100 protrudes from the inner side of the front ring 100, that is, the radial span of the blade 300 along the front ring 100 is greater than the width of the front ring 100, and the blade 300 protrudes from the inner side of the front ring 100. The width of the front ring 100 is the radius difference between the inner diameter and the outer diameter of the front ring 100, and the inner side of the front ring 100 is the air inlet side. By setting the blade 300 to straddle the inner side of the front ring 100, the wind-catching and guiding effect of the blade 300 can be improved, the efficiency of the wind turbine can be effectively increased, and when applied to a wind turbine, it can form an output of high wind pressure and high wind speed.

[0044] It can be understood that the length of the first plug 310 is greater than the length of the second plug 320. One first plug 310 is provided on each side of each blade 300 close to the front ring 100, and two second plugs 320 are provided on each side of each blade 300 close to the rear cover 200. The area of the rear cover 200 is larger than the area of the front ring 100. By providing two second plugs 320 on each side of each blade 300 close to the rear cover 200 and realizing riveting fixation at two positions, the firmness of the connection structure between the blade 300 and the rear cover 200 can be improved, thereby effectively improving the anti-vibration performance of the blade 300 during operation. When applied to a wind turbine, the rear cover 200 is connected to the driving part of the driving mechanism, and the driving force is mainly transmitted from the rear cover 200 to the blade 300. By strengthening the firmness of the connection structure between the rear cover 200 and the blade 300, the working performance of the wind turbine when the wind turbine is applied can be effectively improved.

[0045] In addition, the inner side of the blade 300 protrudes from the inner side of the front ring 100, and the contact area between the blade 300 and the front ring 100 is smaller than the contact area between the blade 300 and the rear cover 200. By increasing the length of the first plug 310 and only setting one at one end of the blade 300, the contact area between the blade 300 and the front ring 100 can be effectively matched, and the stability of the connection structure between the blade 300 and the front ring 100 can be effectively ensured while making full use of the space. The two ends of the blade 300 are respectively fixed by riveting at three positions, which can effectively improve the stability of the blade 300 in the axial and radial positions.

[0046] It can be understood that the blade 300, the first insertion block 310 and the second insertion block 320 corresponding to both ends of the blade 300 are of an integrally formed structure, the front ring 100 and the first positioning convex block 121 thereon are of an integrally formed structure, and the rear cover 200 and the second positioning convex block 221 thereon are of an integrally formed structure. By setting the connection of the corresponding components of the front ring 100, the rear cover 200 and the blade 300 in the front-leaning wind wheel to be of an integrally formed structure, the firmness of the overall structure of the front-leaning wind wheel can be effectively improved, and the stability during operation is good.

[0047] It can be understood that the blade 300, the front ring 100 and the rear cover 200 are all stainless steel structural parts. Correspondingly, the first insertion block 310 and the second insertion block 320 integrally formed at both opposite ends of the blade 300 are also both stainless steel structural parts, the first positioning convex block 121 integrally formed on the front ring 100, and the second positioning convex block 221 integrally formed on the rear cover 200 are also both stainless steel structural parts.

[0048] Compared with the wind wheels made of traditional materials such as galvanized steel plates and aluminum plates, the front-leaning wind wheel of the embodiment of the present invention is made of stainless steel material, has good rigidity, good corrosion resistance, stable and firm structure, and can effectively meet the use requirements of different harsh environments.

[0049] It can be understood that the radial inner side of the blade 300 protrudes from the inner side of the front ring 100, and a round chamfer 301 is provided at the end angle where the blade 300 protrudes from the inner side of the front ring 100. By setting the exposed end angle position of the blade 300 to be a round chamfer, the air inlet guiding effect can be effectively improved, the wind-catching effect can be effectively improved, and thus the efficiency of the wind wheel can be improved.

[0050] It can be understood that the rear cover 200 includes an integrally formed inner ring plate 201, a reinforcing plate 202 and an outer ring plate 203. The reinforcing plate 202 is located on the plane on one side of the outer ring plate 203. The second slot 210 and the second riveting positioning member 220 are both provided on the outer ring plate 203. By setting the reinforcing plate 202 and the outer ring plate 203 to be located on different planes, that is, the rear cover 200 is a concave-convex cover structure, the structural strength in all directions of the rear cover 200 can be effectively improved, thereby improving the structural strength of the front-leaning wind wheel. Since the driving part of the external driving mechanism mainly drives the blade 300 to rotate through the rear cover 200, by enhancing the stability of the structure of the rear cover 200, the working performance of the front-leaning wind wheel of the embodiment of the present invention can be effectively improved. The outer ring plate 203 is annularly connected to the outer edge of the reinforcing plate 202, and the connection between the outer ring plate 203 and the reinforcing plate 202 is set to be a smoothly transitional connection structure. The reinforcing plate 202 is annularly connected to the outer edge of the inner ring plate 201, and the connection between the inner ring plate 201 and the reinforcing plate 202 is set to be a smoothly transitional connection structure.

[0051] It can be understood that the inner ring plate 201 and the outer ring plate 203 are located in the same plane, and the plane where the inner ring plate 201 and the outer ring plate 203 are located is on one side of the reinforcing plate 202. By setting the inner ring plate 201 and the outer ring plate 203 in the same plane, while improving the structural stability of the rear cover 200, the occupied space of the rear cover 200 can be effectively controlled, and the structural stability of the rear cover 200 can be effectively improved on the premise of effectively controlling the volume of the front-leaning wind wheel.

[0052] A fan according to an embodiment of the second aspect of the present invention includes a stable front-leaning wind wheel according to any one of the embodiments of the first aspect above, and the outlet angle of the blade 300 is greater than a right angle.

[0053] It can be understood that the fan further includes a driving mechanism, and the rear cover 200 is connected to the driving part of the driving mechanism, and the driving mechanism can be set as an electric motor.

[0054] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A stable forward-inclined wind wheel, characterized in that: It comprises a front ring (100), a rear cover (200) and a plurality of blades (300), wherein the front ring (100) is in a circular ring shape, and all the blades (300) are evenly distributed between the rear cover (200) and the front ring (100), and each of the blades (300) is parallel to the axis of the front ring (100); The blade (300) is provided with a first plug block (310) and a second plug block (320) at opposite ends thereof, the front ring (100) is provided with a plurality of first slots (110) respectively corresponding to the first plug blocks (310), the first plug blocks (310) are plugged into the first slots (110), the rear cover (200) is provided with a plurality of second slots (210) respectively corresponding to the second plug blocks (320), the second slots (210) are plugged into the second slots (210), a first riveted positioning piece (120) is provided on a side of each of the first slots (110) away from the rear cover (200), and a second riveted positioning piece (220) is provided on a side of each of the second slots (210) away from the front ring (100); The first riveted positioning member (120) comprises two first positioning protrusions (121), the two first positioning protrusions (121) are respectively located on opposite sides of the first slot (110), the first inserting block (310) is riveted between the two first positioning protrusions (121), and along a direction perpendicular to the extension of the first slot (110), the cross-sectional shape of the first positioning protrusion (121) is a right triangle, and the right-angled sides of the two first positioning protrusions (121) are respectively clamped on opposite sides of the first inserting block (310); The second riveted positioning member (220) comprises two second positioning protrusions (221), the two second positioning protrusions (221) are respectively located on opposite sides of the second slot (210), the second insert block (320) is riveted between the two second positioning protrusions (221), and along a direction extending perpendicular to the second slot (210), the cross-sectional shape of the second positioning protrusion (221) is a right triangle, and the right-angled sides of the two second positioning protrusions (221) are respectively clamped on opposite sides of the second insert block (320).

2. A stable forward-inclined wind wheel according to claim 1, characterized in that: The projection of the blade (300) on the front ring (100) protrudes from the inner side of the front ring (100).

3. A stable forward-inclined wind wheel according to claim 2, characterized in that: The length of the first plug-in block (310) is greater than the length of the second plug-in block (320); each blade (300) is provided with one first plug-in block (310) on one side close to the front ring (100); and each blade (300) is provided with two second plug-in blocks (320) on one side close to the rear cover (200).

4. A stable forward-inclined wind wheel according to claim 3, characterized in that: The blade (300), the first plug block (310) and the second plug block (320) are an integrally formed structure, the front ring (100) and the first positioning protrusion (121) are an integrally formed structure, and the rear cover (200) and the second positioning protrusion (221) are an integrally formed structure.

5. A stable forward-inclined wind wheel according to claim 4, characterized in that: The blades (300), the front ring (100) and the rear cover (200) are all stainless steel structural parts.

6. A stable forward-inclined wind wheel according to claim 2, characterized in that: The end corners of the blades (300) protruding from the inner side of the front ring (100) are provided with rounded chamfers (301).

7. A stable forward-inclined wind wheel according to claim 1, characterized in that: The back cover (200) comprises an inner ring plate (201), a reinforcing plate (202) and an outer ring plate (203) which are integrally formed; the reinforcing plate (202) is located on a plane on one side of the outer ring plate (203); the second slot (210) and the second riveted positioning member (220) are both provided on the outer ring plate (203); the outer ring plate (203) is connected to the outer edge of the reinforcing plate (202); and the reinforcing plate (202) is connected to the outer edge of the inner ring plate (201).

8. A stable forward-inclined wind wheel according to claim 7, characterized in that: The inner ring plate (201) and the outer ring plate (203) are located in the same plane.

9. A fan, characterized in that: It comprises a stable forward-inclined wind wheel as claimed in any one of claims 1 to 8, wherein the outlet angle of the blade (300) is greater than a right angle.

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