Fans and their blades

Abstract

This invention discloses a fan and its blades. The blades include a blade root, an outer arc-shaped plate, and an inner arc-shaped plate. The radially inner end of the outer arc-shaped plate is connected to the blade root. The radially inner end of the inner arc-shaped plate is also connected to the blade root. The radially outer ends of the inner and outer arc-shaped plates are offset vertically. By configuring the blades into upper and lower parts (inner and outer arc-shaped plates) while maintaining no attenuation of flow pressure, the number of blades is increased to raise the blade frequency. This can shift high-pitched sounds originally located in the sensitive range of the human ear into the non-sensitive range. Simultaneously, the design of the upper and lower offset inner and outer arc-shaped plates reduces high-pitched sounds and creates a broadband effect, making the noise closer to a "whooshing" sound like white noise, resulting in a more natural sound and a significant fan noise reduction effect.

Description

Technical Field

[0001] This invention relates to the field of wind turbine structure technology, and in particular to a wind turbine and its blades. Background Technology

[0002] Some electronic devices require the installation of fans for heat dissipation. However, due to the need to control the size of electronic devices and achieve a compact design, it is necessary to control the overall shape of the fans. It is worth noting that if the fans are too small, their airflow will be insufficient and needs to be improved. Summary of the Invention

[0003] The purpose of this invention is to provide a wind turbine and its blades to solve the problems of the prior art.

[0004] To address the aforementioned technical problems, embodiments of the present invention provide a blade, comprising: While maintaining the flow pressure without attenuation, the blades are configured with two parts: an inner arc plate and an outer arc plate, which effectively increases the number of blades and raises the blade frequency. This can shift the high-pitched sounds that were originally located in the sensitive range of the human ear into the non-sensitive range. At the same time, the design of the upper and lower separated inner and outer arc plates can reduce high-pitched sounds and create a broadband effect, making the noise closer to a "whooshing" sound like white noise, which sounds more natural and has a significant noise reduction effect on the fan. Attached Figure Description

[0005] Figure 1 and Figure 2 This is a perspective view of a fan according to an embodiment of the present invention.

[0006] Figure 3 and Figure 4 This is an exploded view of a fan according to an embodiment of the present invention.

[0007] Figure 5 This is a perspective view of multiple blades according to an embodiment of the present invention.

[0008] Figure 6 This is an assembly diagram of the fan according to the second embodiment of the present invention.

[0009] Figure 7 and Figure 8 yes Figure 6 An exploded view of the fan in the illustrated embodiment.

[0010] Figure 9 This is an assembly diagram of the fan according to the third embodiment of the present invention.

[0011] Figure 10 and Figure 11 yes Figure 9 An exploded view of the fan in the illustrated embodiment.

[0012] Figure 12This is an assembly diagram of the fan according to the fourth embodiment of the present invention.

[0013] Figure 13 and Figure 14 yes Figure 12 An exploded view of the fan in the illustrated embodiment.

[0014] Figure 15 This is an assembly diagram of the fan according to the fifth embodiment of the present invention.

[0015] Figure 16 and Figure 17 yes Figure 15 An exploded view of the fan in the illustrated embodiment.

[0016] Attached reference numerals: 100, fan; 1, blade; 11, blade root; 111, first section; 112, second section; 12, outer arc plate; 121, multi-section plate; 13, inner arc plate; 2, power plate; 3, impeller cover; 31, air inlet; Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this invention clearer, the various embodiments of this invention will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been provided in the various embodiments of this invention to facilitate a better understanding of this application. However, the technical solutions claimed in the claims of this application can be implemented even without these technical details and with various variations and modifications based on the following embodiments.

[0018] Unless the context requires otherwise, throughout the specification and claims, the word “comprising” and its variations, such as “including” and “having”, shall be understood to have an open, inclusive meaning, that is, to be interpreted as “including, but not limited to”.

[0019] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings to provide a clearer understanding of the purpose, features, and advantages of the present invention. It should be understood that the embodiments shown in the drawings are not intended to limit the scope of the present invention, but are merely illustrative of the essential spirit of the technical solution of the present invention.

[0020] Throughout this specification, references to "an embodiment" or "an embodiment" indicate that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Therefore, the appearance of "in an embodiment" or "an embodiment" in various places throughout the specification does not necessarily refer to the same embodiment. Furthermore, a particular feature, structure, or characteristic may be combined in any manner in one or more embodiments.

[0021] The singular forms “a” and “the” used in this specification and the appended claims include plural references unless otherwise expressly stated herein. It should be noted that the term “or” is generally used to mean “and / or” unless otherwise expressly stated herein.

[0022] In the following description, in order to clearly demonstrate the structure and working method of the present invention, a number of directional terms will be used. However, terms such as "front", "back", "left", "right", "outside", "inside", "outward", "inward", "up", and "down" should be understood as convenient terms and not as limiting terms.

[0023] This invention relates to a fan 100 and the blades 1 of the fan 100. The fan 100 includes a power plate 2, multiple blades 1, and an impeller cover 3. The power plate 2 is disc-shaped and its center is connected to a rotating shaft, serving as a power transmission device. The entire power plate 2 is rotated by a motor and the rotating shaft. The multiple blades 1 are arranged at intervals around the center of the power plate 2 and are respectively connected to the top surface of the power plate 2.

[0024] The impeller cover 3 is installed on the top surface of multiple blades 1. An air inlet 31 is provided at the center of the impeller cover 3. When the impeller rotates, the power plate 2, multiple blades 1, and impeller cover 3 rotate together. Air is drawn in from the air inlet 31 and discharged from the gap between the blades 1, thus achieving the air discharge effect of the fan 100.

[0025] The inner wall of the air inlet 31 has a curved constriction structure, which can guide the airflow during intake. The impeller cover 3 mainly serves to connect the blades 1 and increase the structural strength of the impeller.

[0026] The blade 1 includes a blade root 11, an outer arc plate 12, and an inner arc plate 13. The blade root 11 is an arc plate that stands upright on the top surface of the power plate 2. The height of its inner radial end is greater than the height of its outer radial end. The inner radial end is assembled with the impeller cover 3.

[0027] The radially inner end of the outer arc plate 12 is connected to the radially outer end of the blade root 11, preferably integrally formed. The outer arc plate 12 and the inner arc plate have the same bending direction, but different curvatures. More preferably, the radially inner end of the outer arc plate 12 and the radially outer end of the blade root 11 are smoothly transitioned, or the radially inner end of the outer arc plate 12 extends along the tangent direction of the radially outer end of the blade root 11 to form an arc, or both are on the same arc.

[0028] The inner radial end of the inner arc plate 13 is connected to the outer radial end of the blade root 11, preferably integrally formed. More preferably, the inner radial end of the inner arc plate 13 and the outer radial end of the blade root 11 are smoothly transitioned. Alternatively, the inner radial end of the inner arc plate 13 extends along the tangent direction of the outer radial end of the blade root 11 to form an arc shape.

[0029] The radial outer ends of the inner arc plate 13 and the radial outer ends of the outer arc plate 12 are offset in the vertical direction. That is to say, the radial outer ends of the inner arc plate 13 and the radial outer ends of the outer arc plate 12 extend in different directions. The projections of the radial outer ends of the inner arc plate in the vertical direction and the projections of the radial outer ends of the outer arc plate in the vertical direction do not overlap and have a certain distance.

[0030] Preferably, the radially outer end of the inner arc plate 13 is closer to the inner side in the radial direction than the radially outer end of the outer arc plate 12. That is, the distance between the radially outer end of the inner arc plate 13 and the center of the impeller cover 3 is smaller than the distance between the radially outer end of the outer arc plate 12 and the center of the impeller cover 3.

[0031] Preferably, the outer arc plate 12 is a circular arc plate. Of course, in other embodiments, the outer arc plate 12 can also be other arc-shaped plates.

[0032] Preferably, the inner arc plate 13 is a circular arc plate. Of course, in other embodiments, the inner arc plate 13 can also be other arc-shaped plates.

[0033] In the embodiment shown in the figure, both the outer arc plate 12 and the inner arc plate 13 are circular arc plates. The outer arc plate 12 extends in the tangential direction of the radial outer end of the blade root 11, and the circumferential length of the inner arc plate 13 is different from that of the outer arc plate 12.

[0034] Preferably, the circumferential length of the inner arc plate 13 is greater than the circumferential length of the outer arc plate 12, and the ratio of the circumferential length of the outer arc plate 12 to the circumferential length of the inner arc plate 13 is in the range of 1 / 2 to 2 / 3.

[0035] Preferably, the width of the inner arc plate 13 in the vertical direction is the same as the width of the outer arc plate 12 in the vertical direction.

[0036] The curvature of the inner arc plate 13 is greater than that of the outer arc plate 12. Simultaneously, the radial extension length of the outer arc plate 13 is greater than that of the outer arc plate 12. The radial extension length of the outer arc plate 12 extends to the edge of the power plate 2. The top of the inner arc plate 13 is fixedly connected to or integrally formed with the bottom wall of the impeller cover 3, and the bottom of the outer arc plate 12 is fixedly connected to or integrally formed with the upper surface of the power unit.

[0037] While maintaining the flow pressure without attenuation, the blade 1 is configured as two parts, an inner arc-shaped plate 13 and an outer arc-shaped plate 12, which is equivalent to increasing the number of blades 1 to increase the blade frequency. This can move the sharp sounds originally located in the sensitive area of ​​the human ear into the non-sensitive area of ​​the human ear. At the same time, the design of the upper and lower separated inner arc-shaped plate 13 and outer arc-shaped plate 12 can reduce sharp sounds and create a broadband effect, making the noise closer to the "whooshing" sound of white noise, which sounds more natural and has a significant noise reduction effect on the fan. The fan and its blades provided by this invention have an ingenious structural design, significant noise reduction effect and obvious sound quality improvement, while not affecting the aerodynamic performance of the fan. It can be widely used in various ventilation, air conditioning, and purification equipment that require a low-noise and high-comfort operating environment, and has extremely high industrial practical value and broad market prospects.

[0038] In the second embodiment of the present invention, as Figure 6 , Figure 7 and Figure 8 As shown, the fan 100 also includes a power plate 2, multiple blades 1, and an impeller cover 3. The structure of the power plate 2 and the impeller cover 3 is the same as in the first embodiment, and will not be described again. The difference is that the blade 1 in the second embodiment only has an outer arc plate 12, and the outer arc plate 12 is arc-shaped as a whole. Its radial inner end is connected to the root of the blade 1, and its radial outer end extends with multiple bends.

[0039] Preferably, the outer arc-shaped plate 12 comprises multiple segments 121 arranged radially bent, all of which are straight plates. Preferably, the radial lengths of the multiple segments 121 are the same. Preferably, the outer arc-shaped plate 12 and the root of the blade 1 are integrally formed. This arc-shaped plate has a steep curve, good stability, and high efficiency.

[0040] In the third embodiment of the present invention, as Figure 9 , Figure 10 and Figure 11 As shown, the fan 100 also includes a power plate 2, multiple blades 1, and an impeller cover 3. The structure of the power plate 2 and the impeller cover 3 is the same as in the first embodiment, and will not be described again. The difference is that the blade root 11 in the third embodiment includes a first segment 111 and a second segment 112. The radially outer end of the first segment 111 is connected to the outer arc plate 12, preferably integrally formed with the outer arc plate 12. The height of the first segment 111 is basically the same as the height of the outer arc plate 12, and it is also set in a certain arc shape.

[0041] The second segment 112 is connected to the radial inner end of the first segment 111, and the second segment 112 is curved in an arc shape along the circumference. The bottom end of the second segment 112 is flush with the bottom end of the first segment 111, and its top end protrudes beyond the top end of the first segment 111. The height of the second segment 112 is twice that of the first segment 111. The second segment 112 is bent towards the side of the blade root 11, and its bending arc α is preferably 5-6.5 rad, preferably 5.7 rad. It can be seen that the bending arc of the second segment 112 at the blade root 11 is significantly larger than that of a conventional blade root 11.

[0042] The leaf root 11 has a large bending arc, which provides a wide stable working range and eliminates the risk of hump.

[0043] In the fourth embodiment, such as Figure 12 , Figure 13 and Figure 14 As shown, the fan 100 also includes a power plate 2, multiple blades 1, and an impeller cover 3. The structures of the power plate 2 and the impeller cover 3 are the same as in the first embodiment, and will not be described again. The blades 1 also include an inner arc-shaped plate 13. The circumferential length of the inner arc-shaped plate 13 is less than the circumferential length of the outer arc-shaped plate 12. Multiple inner arc-shaped plates 13 and multiple outer arc-shaped plates 12 are arranged circumferentially at intervals. The bottom end of each inner arc-shaped plate 13 is connected to the power plate 2, but it is not directly connected to the blade root 11. The radially outer ends of both the inner arc-shaped plate 13 and the outer arc-shaped plate 12 are located at the edge of the power plate 2, but the length of the inner arc-shaped plate 13 is much smaller than the length of the outer arc-shaped plate 12. The smaller size of the inner arc-shaped plate 13 can improve flow separation at low flow rates.

[0044] In the fifth embodiment, such as Figure 12 , Figure 13 and Figure 14 As shown, the fan 100 also includes a power plate 2, multiple blades 1, and an impeller cover 3. The structures of the power plate 2 and the impeller cover 3 are the same as in the third embodiment, and will not be described again. The blades 1 are basically the same as in the third embodiment, except that the height of the blades 1 gradually increases from the radial outer end to the radial inner end, and the height b of the radial outer end is between 21mm and 24mm, preferably 22.8mm and 23.4mm. Of course, in some embodiments, the height of the blades 1 is basically the same from the radial outer end to the radial inner end.

[0045] The preferred embodiments of the present invention have been described in detail above, but it should be understood that, if necessary, aspects of the embodiments can be modified to utilize aspects, features, and concepts from various patents, applications, and publications to provide other embodiments.

[0046] In light of the detailed description above, these and other changes can be made to the embodiments. Generally, the terminology used in the claims should not be considered limited to the specific embodiments disclosed in the specification and claims, but should be understood to include all possible embodiments together with the full scope of equivalents enjoyed by these claims.

[0047] Those skilled in the art will understand that the above embodiments are specific examples of implementing the present invention, and in practical applications, various changes in form and detail may be made without departing from the spirit and scope of the present invention.

Claims

1. A blade, characterized in that, include: leaf base; An outer arc-shaped plate, the inner radial end of which is connected to the root of the blade, and the outer radial end which extends in multiple bends.

2. The blade according to claim 1, characterized in that, The outer arc-shaped plate comprises multiple segments arranged radially, with each segment having the same length.

3. The blade according to claim 1, characterized in that, The blade also includes an inner arc-shaped plate, the inner radial end of which is connected to the root of the blade, and the outer radial ends of the inner arc-shaped plate and the outer radial end of the outer arc-shaped plate are offset in the vertical direction.

4. The blade according to claim 3, characterized in that, The outer arc-shaped plate and / or the inner arc-shaped plate are circular arc plates.

5. The blade according to claim 3, characterized in that, The radial outer end of the inner arc-shaped plate is closer to the inner side in the radial direction than the radial outer end of the outer arc-shaped plate.

6. The blade according to claim 3 or 5, characterized in that, The circumferential length of the inner arc-shaped plate is different from that of the outer arc-shaped plate.

7. The blade according to claim 3 or 5, characterized in that, The circumferential length of the inner arc-shaped plate is greater than the circumferential length of the outer arc-shaped plate.

8. The blade according to claim 7, characterized in that, The width of the inner arc plate along the vertical direction is the same as the width of the outer arc plate along the vertical direction.

9. The blade according to claim 3, 4 or 5, characterized in that, The blade root, the outer arc plate, and the inner arc plate are integrally formed.

10. The blade according to claim 1, characterized in that, The blade also includes an inner arc-shaped plate, the length of which along the circumference is less than the length of which along the circumference is the outer arc-shaped plate.

11. The blade according to claim 1, characterized in that, The height of the radial outer end of the outer arc plate ranges from 21mm to 24mm.

12. The blade according to claim 1, characterized in that, The root of the blade includes a first section and a second section, and the radial outer end of the first section is connected to the outer arc-shaped plate; The second segment is connected to the radial inner end of the first segment, and the second segment is curved in an arc along the circumference, with the curvature of the second segment ranging from 5 rad to 6.5 rad.

13. A fan, characterized in that, include: Power board; The blades according to any one of claims 1, wherein the plurality of blades are arranged at intervals around a vertical axis, and the root of each blade is connected to the power plate.

14. The fan according to claim 13, characterized in that, It also includes an impeller cover, which covers the top surface of the plurality of blades and has an air inlet.

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