Cross-flow fan blade structure

Abstract

The invention provides a cross-flow fan blade structure which comprises a fan blade body provided with a first side and a second side. The multiple sunken structures are arranged close to the second side, and the multiple sunken structures are arranged in a sunken mode relative to the surface of the fan blade body; and the plurality of concave structures are also arranged on the fan blade body. According to the invention, the noise is optimized, and the flow resistance of gas can be reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of crossflow fans, and in particular to a crossflow fan blade structure. Background Art

[0002] With the development of science and technology, different application technologies have also emerged. Driven by technology and demand, the structure and function of household appliances have become more and more perfect and diversified. In order to meet new needs, the internal structure of air conditioners is also changing. At present, the air conditioner indoor unit uses a cross-flow fan, but the current cross-flow fan is prone to rotation noise at high speed, high peak value, and poor sound quality. Summary of the invention

[0003] Therefore, an embodiment of the present invention provides a cross-flow fan blade structure, which optimizes noise and reduces the flow resistance of gas.

[0004] In order to solve the above problems, the present invention provides a cross-flow blade structure, which includes: a blade body, the blade body is provided with a first side and a second side; a plurality of recessed structures, the plurality of recessed structures are arranged close to the second side, and the plurality of recessed structures are recessed relative to the surface of the blade body; and the plurality of recessed structures are also arranged in an array on the blade body.

[0005] Compared with the prior art, the technical effect achieved by adopting this technical solution is as follows: by providing a plurality of recessed structures on the fan blade body, the plurality of recessed structures are used to delay the shedding of the boundary layer of the airflow and reduce turbulent noise. At the same time, due to the arrangement, the recessed structure can play a role in breaking the periodicity of the boundary airflow, improve the rotational noise, and improve the sound quality. When the fan blade rotates circumferentially, due to the influence of the arrangement of the evaporator, there is an area with a large negative angle of attack of the intake air. In such an area, the airflow can easily break away from the boundary layer of the blade, forming a vortex zone at the tail of the blade, forming flow resistance. A recessed structure is adopted on the fan blade body, and when the fan blade body rotates circumferentially, the separation point of the airflow on the fan blade body moves downstream, which plays a role in delaying the separation point and reducing the flow resistance.

[0006] In an example of the present invention, the fan blade body is provided with a third side and a fourth side which are arranged opposite to each other; a plurality of recessed structures are connected in sequence and arranged transversely from the third side to the fourth side.

[0007] Compared with the prior art, the technical effect achieved by adopting this technical solution is as follows: by setting up multiple recessed structures and connecting them in sequence, the effect of breaking the periodic effect of the boundary airflow is more obvious and preferred, and at the same time, the noise can be better improved, so that the user can be more comfortable when using it, and it will not cause trouble to the user, thereby improving the use experience. At the same time, the recessed structures are arranged horizontally and spread from the third side to the fourth side, so that the recessed structures have a larger range of action, thereby creating a better noise reduction effect, thereby ensuring the user's use experience, and at the same time, it can better reduce the flow resistance.

[0008] In an example of the present invention, the width of each concave structure is proportional to the unfolded width of the wind blade body.

[0009] Compared with the prior art, the technical effect achieved by adopting this technical solution is: by setting the width of each recessed structure to be proportional to the expanded width of the fan blade body, the recessed structure can be more suitable for the current situation of the fan blade body, so that the recessed structure can play a better role, and the fan blade body can better reduce noise when rotating, improve hardness, and ensure the user experience.

[0010] In an example of the present invention, the width of each recessed structure is defined as H, and the unfolded width of the wind blade body is defined as W; then H=a*W, a∈[1 / 2, 2 / 3].

[0011] Compared with the prior art, the technical effect achieved by adopting this technical solution is as follows: by setting the proportional relationship between the width of the recessed structure and the expanded width of the fan blade body and calculating it through H=a*W, the width of the recessed structure is controlled to be between half and two-thirds of the expanded width of the fan blade body. The recessed structure has the best effect under this proportional width, which can limit the noise to the greatest extent without affecting the original structure of the fan blade body and causing the original effect of the fan blade body to be weakened, thereby making the overall structure more scientific and practical, and improving the user experience.

[0012] In an example of the present invention, each recessed structure includes: a plurality of recessed parts, and the plurality of recessed parts are arranged in an array on the fan blade body.

[0013] Compared with the prior art, the technical effect achieved by adopting this technical solution is: by arranging a plurality of recesses on the fan body, the plurality of recesses are arranged to delay the shedding of the boundary layer of the airflow, reduce the formation of shedding vortices, and reduce turbulent noise. At the same time, the arranged recesses can also improve the sound quality, and can better suppress noise, so that the user experience is better. At the same time, under the condition of large angle of attack, the separation point of the airflow on the blade is moved downstream, which delays the separation point and reduces the flow resistance, making the entire crossflow fan blade structure more practical and improving the user experience.

[0014] In an example of the present invention, the shapes of the plurality of recesses are any one of circular, rectangular, triangular, trapezoidal, or a combination thereof.

[0015] Compared with the prior art, the technical effect achieved by adopting this technical solution is as follows: by setting the shapes of the multiple recesses to be any one of circular, rectangular, triangular, trapezoidal or a combination thereof, the shapes of the recesses can be changed according to actual conditions and can adapt to different scenes, so that the recesses can achieve different effects and improve practicality.

[0016] In an embodiment of the present invention, a plurality of recesses are arranged longitudinally, and the number of the recesses decreases from the middle toward both sides.

[0017] Compared with the existing technology, the technical effect achieved by adopting this technical solution is: by arranging multiple concave parts in a longitudinal arrangement, and the number decreases from the middle to the two sides, the concave parts can break the periodic effect of the boundary airflow, improve the rotation noise, and improve the sound quality. At the same time, such an arrangement can ensure that the fan blades are more stable when in use, thereby ensuring the user experience and not being bothered by noise.

[0018] In one embodiment of the present invention, the spacing between each group of longitudinally adjacent recesses is equal; the spacing between each group of transversely adjacent recesses is equal, and the spacing between each group of longitudinally adjacent recesses is also equal.

[0019] Compared with the prior art, the technical effect achieved by adopting this technical solution is: by setting the spacing between each group of longitudinally adjacent recesses to be equal, and setting the spacing between each group of transversely adjacent recesses to be equal, and the above two distances are also equal, through this arrangement, when the fan blade rotates, these recesses can delay the shedding of the airflow boundary layer and reduce turbulent noise. At the same time, it breaks the periodic effect of the boundary airflow, improves the rotation noise, improves the sound quality, and further improves the user experience.

[0020] In one embodiment of the present invention, the spacing between each group of longitudinally adjacent concave portions is defined as d, and the width of each concave structure is defined as H; then d=H / 4.

[0021] Compared with the prior art, the technical effect achieved by adopting this technical solution is as follows: by setting the spacing between each group of longitudinally adjacent recesses in a proportional relationship with the width of each recessed structure, and calculating by d=H / 4, the spacing between longitudinally adjacent recesses can reach the optimal spacing, so that the best effect is achieved, which can better break the periodic effect of the boundary airflow, improve the rotational noise, improve the sound quality, and further improve the user experience.

[0022] In an example of the present invention, a crossflow blade structure is provided in a crossflow fan, and includes: a plurality of recessed structures arranged close to the inner diameter direction of the crossflow fan.

[0023] Compared with the prior art, the technical effect achieved by adopting this technical solution is: by setting the concave structure close to the inner diameter direction of the crossflow fan, the concave structure can better delay the shedding of the boundary layer of the airflow when the crossflow fan structure rotates in the crossflow fan, reduce turbulent noise, and play a role in breaking the periodicity of the boundary airflow, improving the rotation noise and sound quality, and when the fan blade rotates circumferentially, the separation point of the airflow on the blade moves downstream, delaying the separation point and reducing the flow resistance.

[0024] After adopting the technical solution of the present invention, the following technical effects can be achieved:

[0025] (1) By providing a plurality of recessed structures on the fan blade body, the plurality of recessed structures are used to delay the shedding of the boundary layer of the airflow and reduce turbulent noise. At the same time, due to the arrangement, the recessed structures can play a role in breaking the periodicity of the boundary airflow, and improve the rotational noise and sound quality. When the fan blade rotates circumferentially, due to the influence of the arrangement of the evaporator, there is an area with a large negative angle of attack of the intake air. In such an area, the airflow can easily break away from the boundary layer of the blade, forming a vortex zone at the tail of the blade, thereby forming flow resistance. A recessed structure is used on the fan blade body, and when the fan blade body rotates circumferentially, the separation point of the airflow on the fan blade body moves downstream, which plays a role in delaying the separation point and reducing the flow resistance;

[0026] (2) By arranging a plurality of recesses on the fan body, the recesses can be used to delay the shedding of the boundary layer of the airflow, reduce the formation of shedding vortices, and reduce turbulent noise. At the same time, the arranged recesses can also improve the sound quality and better suppress noise, making the user experience better. At the same time, under large angles of attack, the separation point of the airflow on the blade can be moved downstream, which delays the separation point and reduces the flow resistance, making the entire crossflow fan blade structure more practical and improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 A schematic structural diagram of a crossflow fan blade structure provided in an embodiment of the present invention.

[0029] Figure 2 A schematic diagram of the unfolded structure of a crossflow fan blade structure provided in an embodiment of the present invention.

[0030] Description of reference numerals:

[0031] 100 is a cross-flow fan blade structure; 110 is a fan blade body; 111 is a first side; 112 is a second side; 113 is a third side; 114 is a fourth side; 120 is a recessed structure; and 121 is a recessed portion. DETAILED DESCRIPTION

[0032] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention are described clearly and completely. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] [First embodiment]

[0034] See also Figure 1-Figure 2 The present invention provides a crossflow blade structure 100, which includes: a blade body 110, wherein the blade body 110 is provided with a first side 111 and a second side 112; a plurality of recessed structures 120, wherein the plurality of recessed structures 120 are arranged close to the second side 112, and the plurality of recessed structures 120 are recessed relative to the surface of the blade body 110; and the plurality of recessed structures 120 are also arranged in an array on the blade body 110.

[0035] Specifically, when using the crossflow blade structure 100, it can be understood that the crossflow blade structure 100 is a blade installed on the rotating structure in the crossflow fan, and the first side 111 and the second side 112 in the blade body 110 in the crossflow blade structure 100, wherein the first side 111 is the side close to the outer diameter direction of the rotating structure, and the second side 112 is the side close to the inner diameter direction of the rotating structure.

[0036] Specifically, multiple recessed structures 120 are arranged on the surface of the fan blade body 110 and are recessed, wherein the surface of the fan blade body 110 is specifically a suction surface, wherein each recessed structure 120 includes multiple arranged recesses 121, wherein the recess 121 may have a variety of shapes, namely any one of circular, rectangular, triangular, trapezoidal or a combination thereof. Taking the circular shape as an example, multiple circular recesses 121 are staggeredly distributed in a plum blossom shape, namely the number of recesses 121 arranged in the middle of the entire recessed structure 120 is the largest, and then decreases towards both sides, and the outermost recess 121 is also the outermost recess 121 of the adjacent recessed structure 120, achieving a structure connected in sequence, so that the overall noise reduction function is better, and the structure also makes it more compact.

[0037] Preferably, by providing a plurality of recessed structures 120 on the fan blade body 110, the plurality of recessed structures 120 are used to delay the shedding of the boundary layer of the airflow and reduce turbulent noise. At the same time, due to the arrangement, the recessed structures 120 can play a role in breaking the periodicity of the boundary airflow, improve the rotational noise, and improve the sound quality. When the fan blade rotates circumferentially, due to the influence of the arrangement of the evaporator, there is an area with a large negative angle of attack of the intake air. In such an area, the airflow can easily break away from the boundary layer of the blade, forming a vortex zone at the tail of the blade, forming flow resistance. The recessed structure 120 is used on the fan blade body 110, and when the fan blade body 110 rotates circumferentially, the separation point of the airflow on the fan blade body 110 moves downstream, which plays a role in delaying the separation point and reducing the flow resistance.

[0038] Specifically, the fan blade body 110 is provided with a third side 113 and a fourth side 114 that are arranged opposite to each other; the plurality of recessed structures 120 are connected in sequence and arranged transversely from the third side 113 to the fourth side 114 .

[0039] Preferably, by setting up a plurality of recessed structures 120 connected in sequence, the effect of breaking the periodic action of the boundary airflow is made more obvious and preferred, and at the same time, the noise can be better improved, so that the user can be more comfortable when using it, and it will not cause trouble to the user, thereby improving the use experience. At the same time, the recessed structures 120 are arranged horizontally along the third side 113 to the fourth side 114, so that the recessed structure 120 has a larger range of action, thereby resulting in a better noise reduction effect, thereby ensuring the user's use experience, and at the same time better reducing the flow resistance.

[0040] Specifically, the width of each recessed structure 120 is proportional to the unfolded width of the blade body 110 .

[0041] Preferably, by setting the width of each recessed structure 120 to be proportional to the expanded width of the fan blade body 110, the recessed structure 120 can be more suitable for the current situation of the fan blade body 110, so that the recessed structure 120 can better play its role, and the fan blade body 110 can better reduce noise when rotating, improve hardness, and ensure the user experience.

[0042] Specifically, the width of each recessed structure 120 is defined as H, and the unfolded width of the fan blade body 110 is defined as W; then H=a*W, a∈[1 / 2, 2 / 3].

[0043] Preferably, the proportional relationship between the width of the recessed structure 120 and the expanded width of the fan blade body 110 is calculated by setting H=a*W, so that the width of the recessed structure 120 is controlled to be between half and two-thirds of the expanded width of the fan blade body 110. Under this proportional width, the effect of the recessed structure 120 is best, which can limit the noise to the greatest extent without affecting the original structure of the fan blade body 110 and causing the original effect of the fan blade body 110 to be weakened, thereby making the overall structure more scientific and practical, and improving the user experience.

[0044] Specifically, each recessed structure 120 includes a plurality of recessed portions 121 , and the plurality of recessed portions 121 are arranged in an array on the fan blade body 110 .

[0045] Preferably, multiple recesses 121 are arranged on the fan body 110, and the recesses 121 are arranged to delay the shedding of the boundary layer of the airflow, reduce the formation of shedding vortices, and reduce turbulent noise. At the same time, the arranged recesses 121 can also improve the sound quality, and can better suppress noise, so that the user's experience is better. At the same time, under the condition of large angle of attack, the separation point of the airflow on the blade is moved downstream, which plays a role in delaying the separation point and reducing the flow resistance, making the entire crossflow fan blade structure 100 more practical and improving the user's experience.

[0046] Specifically, the shapes of the plurality of recesses 121 are any one of circular, rectangular, triangular, and trapezoidal shapes or a combination thereof.

[0047] Preferably, by setting the shape of multiple recesses 121 to be any one of circular, rectangular, triangular, trapezoidal or a combination thereof, the shape of the recess 121 can be changed according to actual conditions and can adapt to different scenes, so that the recess 121 can achieve different effects and improve practicality.

[0048] Specifically, the plurality of recesses 121 are arranged longitudinally, and the number of the recesses 121 decreases from the middle toward both sides.

[0049] Preferably, by providing a plurality of concave portions 121 arranged longitudinally, and the number of concave portions 121 decreases from the middle to the two sides, the concave portions 121 can break the periodic effect of the boundary airflow, improve the rotation noise, and improve the sound quality. At the same time, such an arrangement can ensure that the fan blade is more stable during use, thereby ensuring the user's experience and not being bothered by noise.

[0050] Specifically, the spacing between each group of longitudinally adjacent recesses 121 is equal; the spacing between each group of transversely adjacent recesses 121 is equal, and the spacing between each group of longitudinally adjacent recesses 121 is also equal.

[0051] Preferably, by setting the spacing between each group of longitudinally adjacent recesses 121 to be equal, and setting the spacing between each group of transversely adjacent recesses 121 to be equal, and the above two distances are also equal, through this arrangement, when the fan blade rotates, these recesses 121 can delay the shedding of the airflow boundary layer and reduce turbulent noise. At the same time, the periodic effect of the boundary airflow is broken, the rotation noise is improved, the sound quality is improved, and the user experience is further improved.

[0052] Specifically, the spacing between each group of longitudinally adjacent concave portions 121 is defined as d, and the width of each concave structure 120 is defined as H; then d=H / 4.

[0053] Preferably, by setting the spacing between each group of longitudinally adjacent recesses 121 to be proportional to the width of each recessed structure 120, and calculating by d=H / 4, the spacing between longitudinally adjacent recesses 121 can reach an optimal spacing, so that the best effect can be achieved, and the periodic effect of the boundary airflow can be better broken, the rotational noise can be improved, the sound quality can be improved, and the user experience is further improved.

[0054] Specifically, the crossflow blade structure 100 is disposed in a crossflow fan, and includes: a plurality of recessed structures 120 disposed close to the inner diameter direction of the crossflow fan.

[0055] Preferably, by arranging the recessed structure 120 close to the inner diameter direction of the crossflow fan, the recessed structure 120 can better delay the shedding of the boundary layer of the airflow and reduce the turbulent noise when the crossflow fan structure 100 rotates in the crossflow fan. It also plays a role in breaking the periodicity of the boundary airflow, improving the rotation noise and the sound quality. Moreover, when the fan blade rotates circumferentially, the separation point of the airflow on the blade moves downstream, delaying the separation point and reducing the flow resistance.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A crossflow fan blade structure, It is characterized in that include: A fan blade body (110), wherein the fan blade body (110) is provided with a first side (111) and a second side (112); a plurality of recessed structures (120), wherein the plurality of recessed structures (120) are arranged close to the second side (112), and the plurality of recessed structures (120) are arranged recessed relative to the surface of the fan blade body (110); Furthermore, the plurality of recessed structures (120) are arranged in an arranged manner on the fan blade body (110).

2. The crossflow fan blade structure according to claim 1, It is characterized in that The fan blade body (110) is provided with a third side (113) and a fourth side (114) which are arranged opposite to each other; The plurality of recessed structures (120) are connected in sequence and arranged transversely along the third side (113) to the fourth side (114).

3. The crossflow fan structure according to claim 1, It is characterized in that The width of each of the recessed structures (120) is proportional to the unfolded width of the fan blade body (110).

4. The crossflow fan structure according to claim 3, It is characterized in that The width of each of the recessed structures (120) is defined as H, and the unfolded width of the fan blade body (110) is defined as W; Then H = a*W, a∈[1 / 2, 2 / 3].

5. The crossflow fan blade structure according to claim 1, It is characterized in that Each of the recessed structures (120) comprises: A plurality of recesses (121), wherein the plurality of recesses (121) are arranged in an array on the fan blade body (110).

6. The crossflow fan structure according to claim 5, It is characterized in that The shapes of the plurality of recesses (121) are any one of circular, rectangular, triangular, trapezoidal, or a combination thereof.

7. The crossflow fan structure according to claim 5, It is characterized in that The plurality of recesses (121) are arranged longitudinally, and the number of the recesses (121) decreases from the middle toward both sides.

8. The crossflow fan structure according to claim 7, It is characterized in that The spacing between each group of longitudinally adjacent recesses (121) is equal; The spacing between each group of laterally adjacent recesses (121) is equal, and the spacing between each group of longitudinally adjacent recesses (121) is also equal.

9. The crossflow fan blade structure according to claim 8, It is characterized in that Also includes: The spacing between each group of longitudinally adjacent recesses (121) is defined as d, and the width of each recess structure (120) is defined as H; Then d=H / 4.

10. The crossflow fan blade structure according to claim 1, It is characterized in that The crossflow blade structure is provided in the crossflow fan, and includes: The plurality of recessed structures (120) are arranged close to the inner diameter direction of the cross-flow blower.

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