A mesh cover structure and fan

Abstract

This invention discloses a mesh cover structure and a fan. The mesh cover structure includes a first air-expanding component comprising multiple first ribs, each first rib having a first inclined end on a first portion and a second inclined end on a second portion; the first inclined end forms a first angle with a first axis, and the second inclined end forms a second angle with a second axis. A second air-expanding component comprises multiple second ribs, each second rib having a third inclined end on a third portion and a fourth inclined end on a fourth portion; the third inclined end forms a third angle with a third axis, and the fourth inclined end forms a fourth angle with a fourth axis. This design reduces airflow resistance and airflow loss when airflow collides with the mesh cover structure's grille, diffuses the airflow, further increases wind speed, and expands the airflow area without affecting the airflow feel.

Description

Technical Field

[0001] This invention relates to the technical field of air supply equipment, and more particularly to a mesh cover structure and a fan. Background Technology

[0002] Existing fans generally use a combination of thin blades and metal or plastic mesh structures. The type of airflow from the fan can be changed by the front mesh structure, such as a concentrated airflow type or a non-concentrated airflow type.

[0003] To increase wind speed and air volume, a metal mesh cover structure would be preferable, but the production cost of such metal mesh covers is relatively high. Therefore, a plastic mesh cover structure is generally used instead. However, this plastic mesh cover structure has the problem of high wind resistance, which results in some loss of air volume and a reduction in fan airflow. Summary of the Invention

[0004] To overcome the shortcomings of existing technical solutions, embodiments of the present invention provide a mesh cover structure and a fan.

[0005] The technical solution adopted by this invention to solve its technical problem is:

[0006] In a first aspect, embodiments of the present invention provide a mesh cover structure, the mesh cover structure comprising:

[0007] A first air-expanding component includes a plurality of first ribs, each first rib having a first inclined end on a first portion and a second inclined end on a second portion; the first inclined end has a first included angle with a first axis, and the second inclined end has a second included angle with a second axis; the portion with a narrower width between adjacent first ribs is the first portion; the portion with a wider width between adjacent first ribs is the second portion.

[0008] The second air expansion component includes a plurality of second ribs. A third inclined end is provided on the third part of each second rib, and a fourth inclined end is provided on the fourth part of each second rib. The third inclined end has a third included angle with the third axis, and the fourth inclined end has a fourth included angle with the fourth axis. The portion with a narrower width between adjacent second ribs is the third part, and the portion with a wider width between adjacent second ribs is the fourth part.

[0009] As a preferred embodiment of the present invention, the angle of the first included angle is greater than or equal to 0° and less than or equal to 25°;

[0010] The angle of the second included angle is greater than or equal to 10° and less than or equal to 35°.

[0011] As a preferred embodiment of the present invention, the angle of the third included angle is greater than or equal to 0° and less than or equal to 25°;

[0012] The angle of the fourth included angle is greater than or equal to 10° and less than or equal to 40°.

[0013] As a preferred technical solution of the present invention, the first end face of the first rib and the first end face of the second rib are both first straight end faces, and the second end face of the first rib and the second end face of the second rib are both second straight end faces.

[0014] Both the first inclined end and the second inclined end gradually increase in size from the second straight end face of the first rib to the first straight end face of the first rib;

[0015] Both the third inclined end and the fourth inclined end gradually increase in size from the second straight end face of the second rib to the first straight end face of the second rib.

[0016] As a preferred technical solution of the present invention, the first straight end face and the second straight end face are separated by a preset distance, and the first straight end face and the second straight end face are horizontally arranged.

[0017] As a preferred embodiment of the present invention, the outer diameter of each of the first straight end faces is greater than or equal to the outer diameter of each of the second straight end faces.

[0018] As a preferred technical solution of the present invention, the first air expansion component further includes an inner ring frame and a dividing ring rib, wherein the inner ring frame is disposed at the inner center of the dividing ring rib;

[0019] The first end of each of the first reinforcing bars is connected to the outer side of the inner ring frame, and the second end of each of the first reinforcing bars is connected to the inner side of the dividing ring rib.

[0020] The second air expansion assembly also includes an outer ring rib, which is disposed outside the dividing ring rib;

[0021] The first end of each of the second reinforcing bars is connected to the outer side of the dividing ring reinforcing bar, and the second end of each of the second reinforcing bars is connected to the inner side of the outer ring reinforcing bar.

[0022] As a preferred technical solution of the present invention, each of the first ribs is spaced at a predetermined distance from the adjacent first ribs to form a first air cavity for gas transmission.

[0023] Each of the second ribs is spaced at a predetermined distance from the adjacent second ribs to form a second air passage for gas delivery.

[0024] As a preferred technical solution of the present invention, the shape of the first rib and the shape of the second rib are both streamlined ribs or twisted ribs;

[0025] The axial cross-section of the first reinforcing bar and the axial cross-section of the second reinforcing bar are both trapezoidal or parallelogram.

[0026] Secondly, embodiments of the present invention also provide a fan, the fan comprising:

[0027] Wind turbine blade assembly; and

[0028] As described in any of the first aspects, the fan blade assembly is disposed within the screen structure to direct gas toward the outside of the screen structure.

[0029] Compared with the prior art, the beneficial effects of the present invention are:

[0030] This reduces wind resistance and airflow loss when airflow collides with the mesh structure, allowing the airflow to diffuse and further increase the wind speed. This expands the airflow area without affecting the feeling of air delivery. Attached Figure Description

[0031] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is an overall structural diagram of an embodiment of the present invention.

[0033] Figure 2 This is a structural diagram of the first air expansion component according to an embodiment of the present invention.

[0034] Figure 3 This is a structural diagram of the second air expansion component according to an embodiment of the present invention.

[0035] Figure 4 This is a structural diagram of the first and second reinforcing bars according to an embodiment of the present invention.

[0036] Figure 5 yes Figure 4 A cross-sectional view of aa.

[0037] Figure 6 yes Figure 4 A sectional view of bb.

[0038] Figure 7 yes Figure 4 A sectional view of cc.

[0039] Figure 8 yes Figure 4 A cross-sectional view of dd.

[0040] Numbers in the diagram

[0041] 1. First air expansion assembly; 11. First rib; 12. First inclined end; 13. Second inclined end; 16. Inner ring frame; 17. Separating ring rib; 18. First air cavity.

[0042] 2. Second air expansion assembly; 21. Second rib; 22. Third inclined end; 23. Fourth inclined end; 26. Outer ring rib; 27. Second air cavity; 3. First straight end face; 4. Second straight end face. Detailed Implementation

[0043] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0044] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0045] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0046] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0047] To address the technical problem of existing plastic mesh structures, which suffer from high wind resistance, gas dispersion, and reduced fan airflow, this invention provides a mesh structure. This mesh structure, applied to fans or other types of air supply devices, increases the airflow area by maintaining appropriate distances between each rib when gas is conducted outwards from inside the fan, thereby increasing airflow, boosting wind speed, and expanding the airflow field.

[0048] The specific structure of the mesh structure provided in the embodiments of the present invention is described in detail below, according to the appendix. Figure 1-8 As shown, the specific structure of the mesh cover includes:

[0049] First ventilation component 1, according to the attached... Figure 2 As shown, the first air expansion component 1 of this embodiment includes a plurality of first ribs 11, and each first rib 11 is circumferentially spaced. Therefore, the specific number of all first ribs 11 is not limited. The specific number of first ribs 11 can be set according to the overall size of the mesh structure so that each first rib 11 is spaced at a distance that increases the air supply area and thus increases the air volume.

[0050] According to the appendix Figure 5 and attached Figure 6 As shown, a first inclined end 12 is provided on the first part of each first rib 11, and a second inclined end 13 is provided on the second part of each first rib 11. Since the specific shape and structure of the inclined end on each first rib 11 are different, in order to achieve a better air supply effect, each part of the inclined end on each first rib 11 is designed differently, so that the fan assembly can increase the air volume, increase the wind speed, and expand the wind field during the air supply process.

[0051] For example, in this embodiment of the invention, the first rib 11 has a first part and a second part. The first part and the second part of the first rib 11 each have inclined ends with different shapes and structures, namely a first inclined end 12 and a second inclined end 13. The first part of the first rib 11 is located towards the inner ring frame 16, and the second part of the first rib 11 is located towards the separating ring rib 17. The first part and the second part of the first rib 11 are interconnected to form the integral first rib 11.

[0052] The narrower portion between adjacent first ribs 11 is the first part, and the wider portion between adjacent first ribs 11 is the second part.

[0053] The first inclined ends 12 of the first rib 11 all face the same direction, and the second inclined ends 13 of the first rib 11 all face the same direction, but the orientation of the second inclined ends 13 is different from that of the first inclined ends 12.

[0054] According to the appendix Figure 5 As shown, the first inclined end 12 has a first included angle with the first axis. Specifically, it is the angle between the part of the first inclined end 12 that is close to the first straight end face 3 and the first axis. By limiting the angle value of the first included angle within a suitable range, the air supply area can be increased, thereby increasing the air volume and improving the wind speed.

[0055] According to the appendix Figure 6 As shown, the second inclined end 13 has a second included angle with the second axis. Specifically, it is the included angle between the part of the second inclined end 13 that is close to the first straight end face 3 and the second axis. By limiting the angle value of the second included angle within a suitable range, it can also increase the air supply area, increase the air volume and increase the wind speed.

[0056] According to the appendix Figure 3 As shown, the second air expansion component 2 in this embodiment of the invention includes a plurality of second ribs 21, and each second rib 21 is circumferentially spaced. Therefore, the specific number of all second ribs 21 is not limited. The specific number of second ribs 21 is set according to the overall size of the mesh structure.

[0057] According to the appendix Figure 7 and attached Figure 8 As shown, a third inclined end 22 is provided on the third part of each second rib 21, and a fourth inclined end 23 is provided on the fourth part of each second rib 21. The specific shape and structure of the inclined ends on each second rib 21 are different. In order to achieve better air delivery effect, each part of the inclined end on each second rib 21 is designed individually, so that the fan assembly can increase the air volume, increase the wind speed, and expand the wind field during the air delivery process.

[0058] For example, the second rib 21 in this embodiment of the invention also has a third part and a fourth part. The third part and the fourth part of the second rib 21 each have inclined ends with different shapes and structures, namely a third inclined end 22 and a fourth inclined end 23. The third part of the second rib 21 is located towards the separating ring rib 17, and the second part of the first rib 11 is located towards the outer ring rib 26. The third part and the fourth part of the second rib 21 are interconnected to form the integral second rib 21.

[0059] The narrower portion between adjacent second reinforcing bars 21 is the third part, and the wider portion between adjacent second reinforcing bars 21 is the fourth part.

[0060] The orientation of the third inclined end 22 is also different from that of the fourth inclined end 23.

[0061] According to the appendix Figure 7 As shown, there is a third included angle between the third inclined end 22 and the third axis. Specifically, it is the included angle between the part of the third inclined end 22 that is close to the first straight end face 3 of the second rib 21 and the third axis. The angle value of the third included angle is limited to a suitable range.

[0062] According to the appendix Figure 8As shown, there is a fourth included angle between the fourth inclined end 23 and the fourth axis. Specifically, it is the included angle between the part of the fourth inclined end 23 that is close to the first straight end face 3 of the second rib 21 and the fourth axis. The angle value of the fourth included angle is limited to a suitable range.

[0063] In a specific embodiment, the specific angle of the first included angle is within the range of greater than or equal to 0° and less than or equal to 25°, that is, 0°≤α1≤25°. By limiting the specific angle value of the first included angle between the first inclined end 12 and the first axis within this range, the air delivery feel of the fan can be maintained while the air delivery area can be expanded.

[0064] For example, when the fan blade assembly rotates to generate airflow, the airflow is transmitted outward along the end face of the first inclined end 12. From the first end of the first inclined end 12 to the second end of the first inclined end 12, the first inclined end 12, which is located at the first angle (0°≤α1≤25°), will not be too inclined, thus avoiding the problem of large wind resistance and gas dispersion when the airflow is transmitted outward.

[0065] In a specific embodiment, the angle of the second included angle is greater than or equal to 10° and less than or equal to 35°, that is, 10°≤α2≤35°. Similarly, the specific angle value of the second included angle between the second inclined end 13 and the second axis is limited to this range. The angle of the first included angle is generally less than or equal to the angle of the second included angle. By limiting the first included angle (α1) to 0°≤α1≤25° and the second included angle (α2) to 10°≤α2≤35°, the impact of the airflow generated when the fan blades rotates on the grille is reduced, thereby reducing wind resistance.

[0066] For example, the second angle between the second inclined end 13 of the second part of the first rib 11 and the second axis is (10°≤α2≤35°). During the process of airflow being transmitted to the outside along the end face of the second inclined end 13, the airflow is from the first end of the second inclined end 13 to the second end of the second inclined end 13. Under the action of the first inclined end 12 and the second inclined end 13, the first rib 11 as a whole will not be too inclined, which would cause the airflow to be transmitted to the outside with a certain amount of wind resistance and the problem of gas dispersion. Moreover, the distance between each first inclined end 12 and the adjacent and opposite first rib 11 is within the normal range, which can also prevent the user's fingers from reaching into the inside of the mesh cover through the distance between them.

[0067] In a specific embodiment, the angle of the third included angle is greater than or equal to 0° and less than or equal to 25°, that is, 10°≤β1≤35°. The specific angle value of the third included angle between the third inclined end 22 and the third axis is limited to this range. The angle of the third included angle is generally less than or equal to the angle of the fourth included angle, so as not to affect the air delivery feel of the fan and to expand the air delivery area.

[0068] In a specific embodiment, the angle of the fourth included angle is greater than or equal to 10° and less than or equal to 40°. Specifically, the angle of the fourth included angle is greater than or equal to 10° and less than or equal to 40°, that is, 10°≤α2≤40°. Similarly, the specific angle value of the second included angle between the fourth inclined end 23 and the fourth axis is limited to this range. With the third included angle (β1) limited to 0°≤α1≤35° and the fourth included angle (β2) limited to 10°≤α2≤40°, the impact of the airflow generated when the fan blades rotates on the grille is reduced, thus reducing the wind resistance.

[0069] By using the first inclined end 12, the second inclined end 13, the third inclined end 22 and the fourth inclined end 23 of the present invention, which are inclined in the same direction as the rotation direction of the wind blade, the impact of the airflow generated when the wind blade assembly rotates with the grille is reduced, and the wind gathered at the center of the wind blade assembly is diffused out, thereby further increasing the wind speed.

[0070] According to the appendix Figure 5 - Appendix Figure 8 As shown, the first end face of the first rib 11 and the first end face of the second rib 21 are both first straight end faces 3. The first straight end face 3 is set perpendicular to the first axial direction or the second axial direction. Therefore, the first straight end face 3 is set in a straight plane relative to the first inclined end 12 or the second inclined end 13. The first straight end face 3 extends along the first end of the first inclined end 12 or the second inclined end 13. The first end of the first inclined end 12 or the second inclined end 13 is connected to the first straight end face 3, which is used to limit the extension distance of the first inclined end 12 or the second inclined end 13.

[0071] The second end face of the first rib 11 and the second end face of the second rib 21 are both second straight end faces 4. The second straight end face 4 is perpendicular to the third axis or the fourth axis. Therefore, the second straight end face 4 is straight relative to the first inclined end 12 or the second inclined end 13. The second straight end face 4 extends along the second end of the third inclined end 22 or the fourth inclined end 23. The first end of the third inclined end 22 or the fourth inclined end 23 is connected to the second straight end face 4, which is used to limit the extension distance of the third inclined end 22 or the fourth inclined end 23.

[0072] The first inclined end 12 and the second inclined end 13 both gradually increase in size from the second straight end face 4 of the first rib 11 to the first straight end face 3 of the first rib 11. That is, the first inclined end 12 and the second inclined end 13 are both located between the first straight end face 3 and the second straight end face 4 of the first part of the first rib 11. Specifically, the first inclined end 12 is located on the left side between the first straight end face 3 and the second straight end face 4 of the first rib 11, while the second inclined end 13 is located on the right side between the first straight end face 3 and the second straight end face 4 of the first rib 11. This makes the upper part of the first rib 11 larger than the lower part of the first rib 11, forming the first inclined end 12 or the second inclined end 13. This allows the airflow to be transmitted to the outside along the first inclined end 12 or the second inclined end 13, and reduces the impact of the airflow generated when the fan blades rotate with the grille, thus reducing the wind resistance.

[0073] Both the third inclined end 22 and the fourth inclined end 23 gradually increase in size from the second straight end face 4 of the second rib 21 to the first straight end face 3 of the second rib 21. That is, both the third inclined end 22 and the fourth inclined end 23 are located between the first straight end face 3 and the second straight end face 4 of the second rib 21. Specifically, the third inclined end 22 is located on the left side between the first straight end face 3 and the second straight end face 4 of the second rib 21, while the second inclined end 23 is located on the right side between the first straight end face 3 and the second straight end face 4 of the second rib 21. This makes the upper part of the second rib 21 larger than its lower part, thus forming the third inclined end 22 or the fourth inclined end 23. When the airflow is delivered to the outside along the first inclined end 12 or the second inclined end 13, it can also reduce the impact between the airflow generated by the rotation of the fan blades and the grille, thus reducing wind resistance.

[0074] The first straight end face 3 and the second straight end face 4 are separated by a preset distance. The first straight end face 3 and the second straight end face 4 are horizontally arranged. For example, if the first straight end face 3 is located on the upper end face of the first part of the first rib 11, and the second straight end face 4 is located on the lower end face of the first part of the first rib 11, the first straight end face 3 of the first rib 11 and the second straight end face 4 of the second rib 21 are horizontally arranged and opposite to each other.

[0075] The outer diameter of each first straight end face 3 is greater than or equal to the outer diameter of each second straight end face 4. That is, the width of the first straight end face 3 of the first rib 11 and the first straight end face 3 of the second rib 21 is greater than or equal to the width of the corresponding second straight end face 4 of the first rib 11 and the second straight end face 4 of the second rib 21. Since the width of the first straight end face 3 is different from the width of the second straight end face 4, the first inclined end 12, the second inclined end 13, the third inclined end 22 and the fourth inclined end 23 gradually increase from the second straight end face 4 to the first straight end face 3. When the airflow is transmitted outward along the first inclined end 12, the second inclined end 13, the third inclined end 22 and the fourth inclined end 23, the wind resistance between the grille and the fan blades of the mesh cover is reduced, which causes airflow loss. This can maximize the speed and volume of airflow transmitted from the mesh cover structure.

[0076] The table below shows the effects achieved by the traditional mesh structure and the mesh structure provided in the embodiments of the present invention.

[0077]

[0078] In the first embodiment, the mesh structure has a first included angle of 10°, a second included angle of 21°, a third included angle of 15°, a fourth included angle of 25°, a first straight end of 2.1 mm, and a second straight end of 1.0 mm.

[0079] The mesh structure of the second embodiment has a first included angle of 15°, a second included angle of 25°, a third included angle of 20°, a fourth included angle of 30°, a first straight end of 2.5mm, and a second straight end of 1.6mm.

[0080] It is evident that the mesh cover structure of the first embodiment and the mesh cover structure of the second embodiment achieve better maximum wind speed and air volume than the traditional mesh cover structure, and the mesh cover structure of the second embodiment achieves better maximum wind speed and air volume than the mesh cover structure of the first embodiment.

[0081] According to the appendix Figure 1 and attached Figure 2 As shown, the first air expansion assembly 1 also includes an inner ring frame 16 and a dividing ring rib 17. The inner ring frame 16 is located at the inner center of the dividing ring rib 17. Both the inner ring frame 16 and the dividing ring rib 17 are circular and hollow inside. Therefore, the first end of each first rib 11 is connected to the outer side of the inner ring frame 16, and the second end of each first rib 11 is connected to the inner side of the dividing ring rib 17. Each first rib 11 is circumferentially spaced between the inner ring frame 16 and the dividing ring rib 17 and is connected between the inner ring frame 16 and the dividing ring rib 17, thereby forming a complete first air expansion area.

[0082] According to the appendix Figure 1 and attached Figure 3 As shown, the second air-expanding component 2 also includes an outer ring rib 26, which is disposed outside the separating ring rib 17. This outer ring rib 26 is also circular and hollow inside. Located outside and surrounding the separating ring rib 17, each second rib 21 has its first end connected to the outer surface of the separating ring rib 17 and its second end connected to the inner surface of the outer ring rib 26. Each second rib 21 is circumferentially spaced between the separating ring rib 17 and the outer ring rib 26, connecting them to form a complete second air-expanding area. The air outlet area of ​​the mesh structure in this embodiment is composed of this first air-expanding area and the second air-expanding area.

[0083] Each first rib 11 is spaced a predetermined distance from its adjacent first rib 11 to form a first air passage 18 for gas delivery. The airflow passing through the first expansion area is delivered out through the first air passage 18. The first inclined end 12 or the second inclined end 13 on each first rib 11 is specifically oriented towards the end face of the adjacent first rib 11 away from the inclined end. That is, the first inclined ends 12 on the first rib 11 are all oriented in the same direction, such as to the left; and the second inclined ends 13 on the first rib 11 are also all oriented in the same direction, such as to the right, thereby expanding the air delivery area and increasing the air volume and wind speed.

[0084] Each second rib 21 is spaced at a predetermined distance from its adjacent second rib 21 to form a second air passage 27 for gas delivery. The airflow passing through the second expansion area is delivered out through the second air passage 27. The third inclined end 22 or the fourth inclined end 23 on each second rib 21 is specifically oriented towards the end face of the adjacent second rib 21 that is away from the inclined end. That is, the third inclined ends 22 on the second rib 21 are all oriented in the same direction, such as to the left; and the fourth inclined ends 23 on the second rib 21 are also all oriented in the same direction, such as to the right, so as to expand the air delivery area and increase the air volume and air velocity.

[0085] The first rib 11 and the second rib 21 are both streamlined or twisted ribs. The axial cross-section of the first rib 11 and the axial cross-section of the second rib 21 are both trapezoidal or parallelogram, which can effectively reduce the noise generated when the airflow collides with the grid of the mesh structure.

[0086] The mesh structure of this invention makes the tilting direction of each inclined end of the first rib 11 and each inclined end of the second rib 21 the same as the rotation direction of the fan blade assembly, reducing the impact of the airflow generated when the fan blade assembly rotates with the grille, diffusing the wind gathered at the center of the fan blade assembly, further increasing the wind speed, without affecting the air delivery feel of the fan blade assembly, and expanding the air delivery area.

[0087] In addition, this invention also provides a fan, which includes a blade assembly and a mesh structure as described in any of the above embodiments. The blade assembly is disposed within the mesh structure so that the gas is conveyed outward from the mesh structure. A fan with this mesh structure increases airflow and wind speed, and reduces wind resistance caused by the collision between the airflow and the mesh structure's grille when the blade assembly rotates, thus preventing airflow loss.

[0088] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A mesh cover structure, characterized in that, The mesh structure includes: A first air-expanding component includes a plurality of first ribs, each first rib having a first inclined end on a first portion and a second inclined end on a second portion; the first inclined end has a first included angle with a first axis, and the second inclined end has a second included angle with a second axis; the portion with a narrower width between adjacent first ribs is the first portion; the portion with a wider width between adjacent first ribs is the second portion. The second air expansion component includes a plurality of second ribs. A third inclined end is provided on the third part of each second rib, and a fourth inclined end is provided on the fourth part of each second rib. The third inclined end has a third included angle with the third axis, and the fourth inclined end has a fourth included angle with the fourth axis. The portion with a narrower width between adjacent second ribs is the third part; the portion with a wider width between adjacent second ribs is the fourth part. The angle of the first included angle is greater than or equal to 0° and less than or equal to 25°; The angle of the second included angle is greater than or equal to 10° and less than or equal to 35°; the angle of the first included angle is less than the angle of the second included angle.

2. The mesh cover structure according to claim 1, characterized in that: The angle of the third included angle is greater than or equal to 0° and less than or equal to 25°; The angle of the fourth included angle is greater than or equal to 10° and less than or equal to 40°.

3. A mesh cover structure according to any one of claims 1-2, characterized in that: The first end face of the first rib and the first end face of the second rib are both first straight end faces, and the second end face of the first rib and the second end face of the second rib are both second straight end faces; Both the first inclined end and the second inclined end gradually increase in size from the second straight end face of the first rib to the first straight end face of the first rib; Both the third inclined end and the fourth inclined end gradually increase in size from the second straight end face of the second rib to the first straight end face of the second rib.

4. The mesh cover structure according to claim 3, characterized in that: The first straight end face and the second straight end face are separated by a preset distance, and the first straight end face and the second straight end face are set horizontally.

5. A mesh cover structure according to claim 3, characterized in that: The outer diameter of each of the first straight end faces is greater than or equal to the outer diameter of each of the second straight end faces.

6. The mesh cover structure according to claim 1, characterized in that: The first air expansion assembly further includes an inner ring frame and a dividing ring rib, wherein the inner ring frame is disposed at the inner center of the dividing ring rib; The first end of each of the first reinforcing bars is connected to the outer side of the inner ring frame, and the second end of each of the first reinforcing bars is connected to the inner side of the dividing ring rib. The second air expansion assembly also includes an outer ring rib, which is disposed outside the dividing ring rib; The first end of each of the second reinforcing bars is connected to the outer side of the dividing ring reinforcing bar, and the second end of each of the second reinforcing bars is connected to the inner side of the outer ring reinforcing bar.

7. A mesh cover structure according to claim 6, characterized in that: Each of the first ribs is spaced at a predetermined distance from the adjacent first ribs to form a first air cavity for gas delivery. Each of the second ribs is spaced at a predetermined distance from the adjacent second ribs to form a second air passage for gas delivery.

8. The mesh cover structure according to claim 1, characterized in that: Both the first rib and the second rib are streamlined or twisted ribs. The axial cross-section of the first reinforcing bar and the axial cross-section of the second reinforcing bar are both trapezoidal or parallelogram.

9. A fan, characterized in that, The fan includes: Wind turbine blade assembly; and According to any one of claims 1-8, the fan blade assembly is disposed within the mesh structure to deliver gas outward toward the outside of the mesh structure.

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