Fan blade assembly and air conditioning unit

Abstract

The present invention provides a fan blade assembly and an air conditioning unit. The fan blade assembly includes a fan blade; a guide ring, the guide ring is located on the air inlet side of the fan blade, and part of the guide ring extends into the fan blade; a protrusion structure, the protrusion structure is arranged on the outer wall of the guide ring, and the protrusion structure is located outside the fan blade, a leakage channel is formed between two adjacent protrusion structures, and one end of the leakage channel faces the fan blade. The fan blade assembly and air conditioning unit provided by the present invention are provided with a protrusion structure on the outer wall of the guide ring, and the protrusion structure is used to fill the gap between the outer wall of the guide ring and the wheel cover of the fan blade, thereby reducing the leakage loss between the wheel cover and the guide ring, weakening the turbulence intensity generated during the intersection of the leakage airflow and the mainstream, thereby reducing the impact loss at the fan blade inlet, and achieving the purpose of improving the performance and efficiency of the fan system and reducing the noise of the fan assembly.

Description

Technical Field

[0001] The invention relates to the technical field of air drive equipment, in particular to a fan blade assembly and an air conditioning unit. Background Art

[0002] Ceiling air conditioners, also known as ceiling air conditioners or ceiling-mounted and embedded air conditioners, have air conditioner bodies installed between the gaps in the indoor ceiling roof panels, and panels for air inlet and outlet are embedded in the ceiling. The installation of ceiling air conditioners can save space and is more beautiful, and is widely loved by consumers. Ceiling air conditioners use backward centrifugal fan blades, and guide rings are usually set at the fan blade inlet to improve the flow uniformity of the inlet airflow. Since the airflow is transformed from axial flow to radial flow, the flow at the end of the guide ring and the fan wheel cover is extremely turbulent. On the one hand, there is a gap between the guide ring and the wheel cover, causing leakage, and the airflow reflux forms a large leakage loss. On the other hand, the leakage airflow merges into the mainstream and impacts the leading edge of the blade, causing impact losses, which will increase the flow resistance, causing the centrifugal fan blades to have problems of increased power consumption and increased noise. Summary of the invention

[0003] In order to solve the technical problem in the prior art that the airflow leakage between the guide ring and the wheel cover causes the centrifugal fan blade to increase power consumption and noise, a fan blade assembly and an air conditioning unit are provided in which a protruding structure is arranged on the outer wall of the guide ring to reduce leakage loss and reduce the impact noise of the leakage airflow on the blade.

[0004] A fan blade assembly, comprising:

[0005] wind blade;

[0006] A guide ring, the guide ring is located at the wind inlet side of the fan blade, and a portion of the guide ring extends into the fan blade;

[0007] A protrusion structure is arranged on the outer wall of the guide ring, and the protrusion structure is located outside the fan blade, a leakage channel is formed between two adjacent protrusion structures, and one end of the leakage channel faces the fan blade.

[0008] Along the direction approaching the fan blade, the flow area of ​​the leakage channel gradually decreases.

[0009] The raised structure has a first end away from the wind blade and a second end close to the wind blade, and the width of the raised structure gradually increases along the direction from the first end to the second end; and / or, the width n1 of the first end has a numerical range of t2 to 3t2, t2 being the wall thickness of the guide ring extending into the wind blade; and / or, the width n2 of the second end has a numerical range of 1.2n1 to 2n1.

[0010] The value range of the distance n3 between the end of the protruding structure close to the fan blade and the fan blade is 1.2t2 to 2.2t2, where t2 is the wall thickness of the part of the guide ring extending into the fan blade.

[0011] The fan blade assembly also includes a reinforcing structure, which is arranged at the end of the protruding structure facing the fan blade, and the distance n3 is formed between the end of the reinforcing structure away from the protruding structure and the fan blade. The value range of the thickness n6 of the reinforcing structure is t2 to 1.5t2.

[0012] Along the direction approaching the wind blade, the height of the raised structure first increases and then decreases, and the maximum height n5 of the raised structure has a numerical range of 2.2t2 to 4.2t2, t2 being the wall thickness of the guide ring extending into the wind blade; and / or, the distance n4 between the highest point of the raised structure and the wind blade has a numerical range of 4t2 to 8t2, t2 being the wall thickness of the guide ring extending into the wind blade.

[0013] Along the direction approaching the wind blade, the raised structure includes a gradually rising section and a gradually falling section, the connection between the gradually rising section and the gradually falling section constitutes the highest point of the raised structure, and the value range of the angle θ4 between the plane where the side of the gradually falling section away from the guide ring is located and the plane where the side of the gradually rising section away from the guide ring is located is 110° to 130°.

[0014] The side surface of the gradually rising section away from the guide ring is an arc surface, and the angle θ4 is formed between the tangent plane of the arc surface at the highest point of the protruding structure and the plane where the side surface of the gradually falling section away from the guide ring is located.

[0015] The median line of the raised structure is an arc, and the radius R of the median line ranges from 0.55R3 to 0.75R3, where R3 is the radius of the end of the guide ring extending into the wind blade; and / or the raised structure has a first end away from the wind blade and a second end close to the wind blade, and the angle θ3 between the line connecting the endpoints of the median line at the first end and the endpoints at the second end and the central axis of the guide ring ranges from 10° to 20°.

[0016] The value range of the angle γ formed by two adjacent protrusion structures at the central axis of the guide ring is 3° to 6°.

[0017] The inner wall of the guide ring is provided with guide grooves, and the guide grooves correspond to the protruding structures one by one.

[0018] The depth of the guide groove gradually increases along the gas flow direction; and / or the maximum depth m3 of the guide groove has a numerical range of 0.2t2 to 0.4t2, where t2 is the wall thickness of the guide ring extending into the fan blade.

[0019] Along the gas flow direction, the width of the guide groove gradually increases; and / or, the width m1 of the inlet of the guide groove has a numerical range of 0.8t2 to 2t2; and / or, the width m2 of the outlet of the guide groove has a numerical range of 1.5m1 to 2.5m1.

[0020] The median line of the guide groove is an arc, and the radius R of the median line ranges from 0.55R3 to 0.75R3, where R3 is the radius of the end of the guide ring extending into the wind blade; and / or, the guide groove has a first end away from the wind blade and a second end close to the wind blade, and the angle θ3 between the line connecting the endpoints of the median line at the first end and the endpoints at the second end and the central axis of the guide ring ranges from 10° to 20°.

[0021] Along the gas flow direction, the guide ring includes a first straight segment, a second transition segment and a second straight segment connected in sequence, part of the second straight segment is located inside the wind blade, and the protruding structure is arranged on the outer wall of the second transition segment and the outer wall of the second straight segment.

[0022] The numerical range of the length c of the second straight line segment extending into the interior of the fan blade is 0.5a to 0.7a, and the length c is greater than or equal to 2t1, where a is the length of the straight line segment of the wheel cover of the fan blade, and t1 is the wall thickness of the wheel cover of the fan blade; and / or, the range of the gap w between the second straight line segment and the straight line segment of the wheel cover of the fan blade is 2.5t1 to 3.5t1.

[0023] The guide ring also includes a planar guide segment, which is arranged at one end of the first straight segment away from the second transition segment, and the distance h between the planar guide segment and the end of the second straight segment away from the second transition segment has a numerical range of 0.37R3 to 0.45R3, where R3 is the radius of the second straight segment.

[0024] The numerical range of the axial length h1 of the second straight segment is 0.26h to 0.34h; and / or, the numerical range of the axial length h2 of the second transition segment is 0.3h to 0.38h; and / or, the numerical range of the axial length h3 of the first straight segment is 0.28h to 0.36h.

[0025] Along the gas flow direction, the flow area of ​​the second straight line segment gradually decreases, and the value range of the angle θ1 between the profile line of the second straight line segment and the outlet end face of the second straight line segment is 90.5° to 92°; along the gas flow direction, the flow area of ​​the first straight line segment gradually decreases, and the value range of the angle θ2 between the profile line of the first straight line segment and the outlet end face of the first straight line segment is 135° to 145°.

[0026] The wind blade includes a blade and a wheel cover, the wheel cover is arranged at one end of the blade facing the guide ring, the wheel cover includes a wheel cover straight segment and a wheel cover arc segment connected in sequence, the connection position of the wheel cover straight segment and the wheel cover arc segment is located between the blade and the guide ring, and part of the wheel cover straight segment surrounds the outer circumference of the end of the guide ring, the diameter of the wheel cover arc segment gradually increases in the direction away from the wheel cover straight segment, and the arc radius R2 of the wheel cover arc segment has a numerical range of 0.15R1 to 0.23R1; and / or, the axial length a of the wheel cover straight segment has a numerical range of 0.31R2 to 0.39R2; and / or, the distance b between the highest point of the blade and the end face of the wheel cover straight segment close to the guide ring has a numerical range of 0.55R2 to 0.63R2.

[0027] An air conditioning unit comprises the above-mentioned fan blade assembly.

[0028] The fan blade assembly and air-conditioning unit provided by the present invention have a protruding structure on the outer wall of the guide ring, and the protruding structure is used to fill the gap between the outer wall of the guide ring and the wheel cover of the fan blade, thereby reducing the leakage loss between the wheel cover and the guide ring, weakening the turbulence intensity generated in the process of the leakage airflow converging with the mainstream, thereby reducing the impact loss at the fan blade inlet, and forming a leakage channel between the protruding structures, forcing the leakage airflow to flow through the leakage channel, limiting the area where the leakage airflow generates turbulence, thereby further limiting the influence of turbulence on the convergence of the mainstream, reducing the impact loss at the fan blade inlet, and at the same time, due to the limitation of the leakage channel on the leakage airflow, the impact range of the leakage airflow on the leading edge of the blade is reduced, thereby reducing the airflow noise, thereby achieving the purpose of improving the performance and efficiency of the fan system and reducing the noise of the fan assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic diagram of the structure of a fan blade assembly provided in an embodiment of the present invention;

[0030] Figure 2 A cross-sectional view of a fan blade assembly provided by an embodiment of the present invention;

[0031] Figure 3 A top view of a fan blade assembly provided by an embodiment of the present invention;

[0032] Figure 4Another schematic diagram of the structure of the fan blade assembly provided by an embodiment of the present invention;

[0033] Figure 5 for Figure 4 A local schematic diagram of the location A;

[0034] Figure 6 Another schematic diagram of the structure of the fan blade assembly provided by an embodiment of the present invention;

[0035] Figure 7 for Figure 6 A partial schematic diagram of point B;

[0036] Figure 8 A schematic diagram of the structure of a guide ring provided in an embodiment of the present invention;

[0037] Fig. 9 for Figure 8 A partial schematic diagram of point C;

[0038] Fig.10 Another schematic diagram of the structure of the guide ring provided by the embodiment of the present invention;

[0039] Fig.11 A power curve diagram of the fan blade assembly provided by the embodiment of the present invention and the centrifugal fan blade of the prior art;

[0040] Fig.12 A noise curve diagram of the fan blade assembly provided by the embodiment of the present invention and the centrifugal fan blade of the prior art;

[0041] In the figure:

[0042] 1. Fan blade; 2. Guide ring; 3. Raised structure; 31. Leakage channel; 4. Reinforced structure; 32. Gradually rising section; 33. Gradually lowering section; 5. Guide groove; 21. First straight line section; 22. Second transition section; 23. Second straight line section; 24. Plane guide section; 11. Blade; 12. Wheel cover; 121. Wheel cover straight line section; 122. Wheel cover arc section. Implementation

[0043] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0044] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. 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 should fall within the scope of protection of the present invention.

[0045] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged where appropriate, so as to describe the embodiments of the present invention described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0046] It should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "inner", "outer" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0047] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installation", "setting", and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, an indirect connection through an intermediate medium, or the internal connection of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] The centrifugal fan blades in the prior art refer to the fan blades that take in air axially, discharge air radially, and use centrifugal force to do work to increase the pressure of the air. Driven by the motor, the fan blades rotate counterclockwise, generating negative pressure at the inlet end of the fan blades, and the airflow is continuously sucked in; an air flow channel is formed between the wheel cover and the wheel disc, and the airflow enters the channel axially and is thrown out radially under the action of centrifugal force. An air inlet is formed at the wheel cover of the fan blade in the centrifugal fan blade. When the fan blade rotates, the airflow is sucked in from the air inlet of the fan blade. At the same time, the rotation process of the fan blade exerts a dynamic effect on the airflow, increasing the pressure and speed of the gas. Under the action of centrifugal force, the airflow is discharged along the exhaust port of the blade flow channel between the blades in the fan blade. A guide ring is usually set at the inlet of the fan blade to improve the flow uniformity of the inlet airflow. Since the airflow changes from axial flow to radial flow, the flow at the end of the guide ring and the impeller cover is extremely turbulent. On the one hand, there is a gap between the guide ring and the impeller cover, which causes leakage, and the airflow backflows to form a large leakage loss. On the other hand, the leakage airflow merges into the mainstream and impacts the leading edge of the blade, causing impact loss. Both of these will increase the flow resistance, causing the centrifugal impeller to have problems of increased power consumption and increased noise. To this end, the present application provides a method such as Figures 1 to 12 The fan blade assembly shown includes: a fan blade 1; a guide ring 2, the guide ring 2 is located on the air inlet side of the fan blade 1, and a portion of the guide ring 2 extends into the fan blade 1; a protrusion structure 3, the protrusion structure 3 is arranged on the outer wall of the guide ring 2, and the protrusion structure 3 is located outside the fan blade 1, a leakage channel 31 is formed between two adjacent protrusion structures 3, and one end of the leakage channel 31 faces the fan blade 1. A protruding structure 3 is provided on the outer wall of the guide ring 2, and the protruding structure 3 is used to fill the gap between the outer wall of the guide ring 2 and the wheel cover of the fan blade 1, thereby reducing the leakage loss between the wheel cover and the guide ring 2, weakening the turbulence intensity generated in the process of the leakage airflow and the mainstream converging, thereby reducing the impact loss at the inlet of the fan blade 1, and forming a leakage channel 31 between the protruding structures 3, forcing the leakage airflow to flow through the leakage channel 31, limiting the area where the leakage airflow generates turbulence, thereby further limiting the influence of turbulence on the convergence of the mainstream, reducing the impact loss at the inlet of the fan blade 1, and at the same time, due to the limitation of the leakage channel 31 on the leakage airflow, the impact range of the leakage airflow on the leading edge of the blade is reduced, thereby reducing the airflow noise, thereby achieving the purpose of improving the performance and efficiency of the fan system and reducing the noise of the fan components. Fig.11 and Fig.12 As shown, under any standard wind volume, the power of the fan blade assembly provided by the present application is lower than that of the prior art, and the noise is lower than that of the prior art. 3 / h air volume, the power of this embodiment is reduced by about 6W and the noise is reduced by 0.6dB(A).

[0049] Furthermore, the flow area of ​​the leakage channel 31 gradually decreases in the direction close to the fan blade 1. The flow area of ​​the leakage channel 31 is gradually reduced, so that the resistance of the leakage airflow flowing through the leakage channel 31 is gradually increased, so that the increase in resistance can further suppress the flow of the leakage airflow, weaken the ability of the airflow to leak between the guide ring 2 and the wheel cover, reduce the leakage loss and flow loss generated by the leakage airflow, and also reduce the impact of the leakage airflow on the fan blade 1, thereby reducing noise. Moreover, due to the gradual reduction of the flow area of ​​the leakage channel 31, the pressure of the leakage gas finally discharged through the leakage channel 31 is greater than the pressure of the leakage gas without the convex structure 3 in the prior art. At this time, the pressure value of the leakage gas is less different from the pressure value of the mainstream gas flowing through the inside of the fan blade 1, and the turbulence intensity that can be caused is also weaker, which can further reduce the impact loss of the fan assembly. As an embodiment, in order to gradually reduce the flow area of ​​the leakage channel 31, the convex structure 3 has a first end away from the fan blade 1 and a second end close to the fan blade 1, and the width of the convex structure 3 gradually increases from the first end to the second end. By gradually increasing the width of the raised structure 3, the leakage channel 31 is gradually reduced, thereby gradually increasing the resistance of the leakage channel 31 to the leakage gas, avoiding the problem of fluctuation of the leakage gas caused by the sudden change of the flow area and generating other noises, and effectively improving the noise of the fan assembly. Among them, the numerical range of the width n1 of the first end is t2 to 3t2, t2 is the wall thickness of the part of the guide ring 2 extending into the fan blade 1. If the width n1 of the first end is too large, the flow area of ​​the leakage channel 31 will be compressed, and a good guiding effect will not be achieved. If the width n1 of the first end is too small, a large amount of leakage gas will be introduced into the leakage channel 31, which will increase the flow rate of the leakage gas. Moreover, if the width n1 of the first end is too small, the filling effect of the raised structure 3 on the gap between the guide ring 2 and the wheel cover will be weakened, which will still cause the problem of increased leakage gas flow rate. Only when the width n1 of the first end is within the range of t2 to 3t2, the leakage gas flow rate will be increased. , can effectively fill the gap between the guide ring 2 and the wheel cover and reduce the leakage gas flow rate; similarly, the numerical range of the width n2 of the second end is 1.2n1 to 2n1. If the width n2 of the second end is too large, the flow area of ​​the leakage channel 31 will become narrower along the airflow leakage direction more dramatically, which will cause the local flow field of the gap between the guide ring 2 and the wheel cover where the protruding structure 3 is located to change more turbulently, and cannot achieve a good guiding effect. If the width n2 of the second end is too small, the flow area of ​​the leakage channel 31 will change less, and the hindering effect on the leakage gas will be reduced, which will still cause the problem of increased leakage gas flow rate.Only the width n2 of the second end is between 1.2n1 and 2n1, which can smoothly reduce the flow area of ​​the leakage channel 31 while ensuring that the spacing between the protruding structures 3 is reasonable, reducing the flow rate of the leakage gas, rectifying the leakage airflow between the guide ring 2 and the wheel cover, weakening the turbulence intensity of the leakage airflow backflow mixed with the mainstream in the main air duct of the guide ring 2, and reducing the turbulence noise at the inlet of the fan blade 1.

[0050] The value range of the spacing n3 between the end of the protruding structure 3 close to the fan blade 1 and the fan blade 1 is 1.2t2 to 2.2t2, where t2 is the wall thickness of the guide ring 2 extending into the fan blade 1. The axial arrangement range of the protruding structure 3 outside the guide ring 2 is limited to ensure the minimum gap between the moving and static parts (the guide ring 2 and the fan blade 1), avoid interference between the fan blade 1 and the outside of the guide ring 2 when rotating, and ensure the reliability of the fan blade assembly.

[0051] The fan blade assembly also includes a reinforcing structure 4, which is arranged at the end of the protruding structure 3 facing the fan blade 1, and the end of the reinforcing structure 4 away from the protruding structure 3 forms the spacing n3 with the fan blade 1, and the value range of the thickness n6 of the reinforcing structure 4 is t2 to 1.5t2. By setting the reinforcing structure 4, the length of the protruding structure 3 is supplemented to a certain extent, and the length dimension of the leakage channel 31 is increased to increase the blocking effect and rectification effect on the leakage airflow, increase the structural strength of the guide ring 2, and especially when the guide groove is provided on the inner wall of the guide ring 2, ensure the structural strength and structural reliability of the guide ring 2. Among them, the extension of the protruding structure in the direction of the fan blade 1 forms the reinforcing structure 4.

[0052] Along the direction close to the fan blade 1, the height of the protruding structure 3 increases first and then decreases, and the maximum height n5 of the protruding structure 3 has a numerical range of 2.2t2 to 4.2t2, t2 is the wall thickness of the guide ring 2 extending into the fan blade 1, and by increasing the height of the protruding structure 3 first and then decreasing it, the leakage airflow passing through the leakage channel 31 is further restricted by the gradually increasing height, and the airflow is guided to flow in the leakage channel 31 to prevent it from flowing out of the leakage channel 31. At this time, at the highest point of the protruding structure 3, the blocking effect of the leakage channel 31 on the leakage gas is improved, thereby reducing the flow of the leakage gas, and then reducing the height of the protruding structure 3, that is, gradually lowering the part of the protruding structure 3 close to the wheel cover, that is, the length of the leakage channel 31 can be extended, and the purpose of avoiding interference between the protruding structure 3 and the wheel cover can be achieved. Among them, the numerical range of the spacing n4 between the highest point of the protruding structure 3 and the fan blade 1 is 4t2 to 8t2, t2 is the wall thickness of the guide ring 2 extending into the fan blade 1. Since the leaked airflow in the gap between the guide ring 2 and the wheel cover still has rotational properties along the direction of the fan blade 1, when n4 is too large, it will disturb the local airflow, making the leaked airflow more uneven, increasing the local airflow loss, and may also cause interference between the fan blade 1 and the guide ring 2. When n4 is too small, it will cause obstruction to the leaked airflow and reduce the guiding effect, and the working efficiency of the fan blade assembly cannot be guaranteed. Specifically, along the direction close to the fan blade 1, the raised structure 3 includes a gradually rising section 32 and a gradually falling section 33. The connection between the gradually rising section 32 and the gradually falling section 33 constitutes the highest point of the raised structure 3. The value range of the angle θ4 between the plane where the side of the gradually falling section 33 away from the guide ring 2 is located and the plane where the side of the gradually rising section 32 away from the guide ring 2 is located is 110° to 130°. Under the premise of ensuring that the raised structure 3 reliably guides and rectifies the leaked gas, the length of the gradually falling section 33 is reduced as much as possible, so as to further avoid the interference between the raised structure 3 and the wheel cover.

[0053] The side of the gradually rising section 32 away from the guide ring 2 is an arc surface, and the angle θ4 is formed between the tangent plane at the highest point of the convex structure 3 and the plane where the side of the gradually lowering section 33 away from the guide ring 2 is located. By setting the side of the gradually rising section 32 as an arc surface, when the leaked gas does not flow into the leakage channel 31 but flows on the surface of the gradually rising section 32, it will be guided by the arc surface of the gradually rising section 32 and move away from the fan blade 1, reducing the impact on the wheel cover and the fan blade 1, thereby reducing the noise of the fan blade assembly.

[0054] The mid-profile of the protruding structure 3 is an arc, and the value range of the radius R of the mid-profile is 0.55R3 to 0.75R3, where R3 is the radius of the end of the guide ring 2 extending into the fan blade 1. That is, the protruding structure 3 is in a twisted shape relative to the profile of the guide ring 2, so that the protruding structure 3 forms a leakage channel 31 on the outer wall of the guide ring 2 that deflects toward the side of the protruding structure 3, and the leakage airflow can flow in a certain spiral, avoiding the leakage airflow from directly impacting the fan blade 1, further reducing the noise at the inlet of the fan blade 1, and the larger R3 is, the closer the protruding structure 3 is to a straight line, making the deflection effect of the protruding structure 3 on the leakage airflow worse, and the smaller R3 is, the greater the curvature of the protruding structure 3 is, which will hinder the flow of the leakage airflow and affect the guiding effect of the leakage channel 31 on the leakage airflow. Wherein, the protruding structure 3 has a first end away from the fan blade 1 and a second end close to the fan blade 1, and the value range of the angle θ3 between the line between the endpoints of the median line at the first end and the endpoints at the second end and the central axis of the guide ring 2 is 10° to 20°. If the angle θ3 is too small, the drainage effect on the leakage airflow will be reduced, and if it is too large, the leakage airflow will be sharply deflected, the flow field will be turbulent, and the eddy loss will be aggravated. A suitable angle can reduce the impact loss. Preferably, the deflection direction of the protruding structure 3 is consistent with the rotation direction of the fan blade 1, that is, the second end of the protruding structure 3 is deflected toward the rotation direction of the fan blade 1 relative to the first end, so that the leakage airflow is also deflected toward the rotation direction of the fan blade 1, thereby reducing the interference with the mainstream airflow. Wherein, the median line refers to a curve that can divide the protruding structure 3 into two symmetrical parts along the width direction of the protruding structure 3, and can also be a line passing through the midpoint of the width at any position of the protruding structure 3.

[0055] The value range of the angle γ formed by two adjacent protrusion structures 3 at the central axis of the guide ring 2 is 3° to 6°. The distribution density of the protrusion structures 3 on the outer wall of the guide ring 2 is controlled by limiting the angle γ. Under this density, the protrusion structures 3 can reliably block and guide the leakage airflow. When the number of protrusion structures 3 is too large, the weight and structural complexity of the guide ring 2 will be seriously increased, affecting the reliability of the fan blade assembly. When the number of protrusion structures 3 is too small, the blocking and guiding effects of the protrusion structures 3 on the leakage airflow will be poor, resulting in a low efficiency of the fan blade assembly.

[0056] Furthermore, a guide groove 5 is provided on the inner wall of the guide ring 2, and the guide groove 5 corresponds to the protruding structure 3 one by one. The guide groove 5 is used to guide the gas flowing through the guide ring 2, so that the main airflow (the airflow flowing through the guide ring 2) during the work of the fan blade 1 is better attached to the surface of the blade and the wheel cover, reducing the eddy loss in the flow channel, improving the working ability of the blade, and thus improving the performance of the fan blade assembly. Preferably, the depth of the guide groove 5 gradually increases along the gas flow direction. Under the condition of the same flow rate of the fan blade 1, the airflow velocity in the guide ring 2 structure provided with the guide groove 5 gradually decreases, which can reduce the impact on the leading edge of the blade, thereby alleviating turbulent noise. Among them, the maximum depth m3 of the guide groove 5 has a numerical range of 0.2t2 to 0.4t2, and t2 is the wall thickness of the guide ring 2 extending into the fan blade 1. When the value of m3 is too large, the wall thickness of the guide ring 2 will be too thin, resulting in damage to the guide ring 2. When the value of m3 is too small, the gas guiding effect of the guide groove 5 will deteriorate. Only when m3 is in the range of 0.2t2 to 0.4t2 can the guiding effect of the guide groove 5 be guaranteed and the structural reliability of the guide ring 2 be guaranteed.

[0057] Furthermore, along the gas flow direction, the width of the guide groove 5 gradually increases. Under the same flow rate, the gas flow process in the guide groove 5 is a process of gradually slowing down, thereby improving the guide effect of the guide groove 5 and reducing the impact of the airflow on the fan blade 1. Among them, the value range of the width m1 of the inlet of the guide groove 5 is 0.8t2 to 2t2. When the inlet width m1 of the guide groove 5 is too large, the flow area of ​​a single guide groove 5 will be too wide, and the effect of airflow deflection and guidance will be weakened. When the inlet width m1 of the guide groove 5 is too small, the airflow guiding effect is poor; similarly, the value range of the width m2 of the outlet of the guide groove 5 is 1.5m1 to 2.5m1. When the outlet width m2 of the guide groove 5 is too large, the flow area of ​​the guide groove 5 will be too wide as a whole, thereby causing the groove to have a poor airflow guiding effect. When the outlet width m2 of the guide groove 5 is too small, the inlet width of the guide groove 5 needs to be smaller, the airflow entering the guide groove 5 becomes less, and the airflow guiding effect is poor.

[0058] The mid-profile of the guide groove 5 is an arc, and the value range of the radius R of the mid-profile is 0.55R3 to 0.75R3, R3 is the radius of the end of the guide ring 2 extending into the fan blade 1, and the shape of the guide groove 5 is a twisted shape relative to the profile of the guide ring 2, so that the airflow flowing through the guide groove 5 can be guided in the rotation direction of the fan blade 1, reducing the aerodynamic resistance of the fan blade 1 when the fan blade 1 is running, and improving the working effect of the fan blade 1. In addition, the guide groove 5 has the same shape as the convex structure 3, and the convex structure 3 can structurally reinforce the position where the guide groove 5 is opened in the guide ring 2 to ensure the structural reliability of the guide ring 2. Preferably, the reinforcing structure 4 is used to reinforce the guide groove 5. The outlet end of the flow groove 5 is partially compensated to fully ensure the structural reliability of the guide ring 2, wherein the larger the R3 is, the closer the convex structure 3 is to a straight line, so that the deflection effect of the guide groove 5 on the airflow flowing in the guide ring 2 becomes worse, and the smaller the R3 is, the larger the curvature of the guide groove 5 is, which will affect the flow of the airflow along the guide groove 5 and reduce the intake uniformity of the fan blade 1; wherein the guide groove 5 has a first end away from the fan blade 1 and a second end close to the fan blade 1, and the value range of the angle θ3 between the line between the end point of the median line at the first end and the end point at the second end and the central axis of the guide ring 2 is 10° to 20°. If the angle θ3 is too small, the effect of guiding the airflow flowing in the guide ring 2 to the rotation direction of the fan blade 1 will be reduced, and if it is too large, the local airflow will be deflected violently, the flow field will be turbulent, and the eddy loss will be aggravated. A suitable angle can reduce the intake resistance and impact loss. The midline refers to a curve that can divide the guide groove 5 into two symmetrical parts along the width direction of the guide groove 5 , and may also be a line passing through the midpoint of the width at any position of the guide groove 5 .

[0059] Along the gas flow direction, the guide ring 2 includes a first straight segment 21, a second transition segment 22, and a second straight segment 23 that are connected in sequence, a portion of the second straight segment 23 is located inside the fan blade 1, and the protruding structure 3 is arranged on the outer wall of the second transition segment 22 and the outer wall of the second straight segment 23. When the airflow flows through the guide ring 2, it will flow through the first straight segment 21, the second transition segment 22, and the second straight segment 23 in sequence. Since the end of the second straight segment 23 is located inside the fan blade 1, the airflow can flow directly to the fan blade 1, thereby reducing the leakage airflow between the guide ring 2 and the fan blade 1 as much as possible, and improving the working capacity of the fan blade 1.

[0060] The value range of the length c of the second straight line segment 23 extending into the interior of the fan blade 1 is 0.5a to 0.7a, and the length c is greater than or equal to 2t1, a is the length of the wheel cover straight line segment of the fan blade 1, and t1 is the wall thickness of the wheel cover of the fan blade 1. The length c is the height of the horizontal overlapped part when the fan blade 1 and the guide ring 2 are matched. When the fan blade 1 rotates, a part of the airflow flows back from the gap where the length c is located, causing leakage, and does not participate in the external work, resulting in energy loss. When the length c is too large, when the fan blade 1 is running at a high speed, it may interfere with the outer side of the guide ring 2. When the length c is too small, the fan blade 1 and the guide ring 2 are not matched tightly, and the airflow leaking from the gap will increase, causing the performance of the fan blade 1 to decrease and the noise to increase. Reasonable control of the size parameters of the second guide segment is conducive to increasing the air intake capacity of the fan blade 1, reducing the leakage of the matching gap, reducing the airflow impact loss at the leading edge of the fan blade 1, and improving the work efficiency of the fan blade 1. Preferably, t1 is equal to t2.

[0061] The gap w between the second straight line segment 23 and the straight line segment of the wheel cover of the fan blade 1 ranges from 2.5t1 to 3.5t1. The larger the value of the gap w, the more leakage airflow there is between the guide ring 2 and the fan blade 1, which will affect the working efficiency of the fan blade 1. When the value of the gap w is smaller, the gap between the guide ring 2 and the fan blade 1 is too small, and there is a possibility of structural interference between the fan blade 1 and the guide ring 2, which affects the reliability of the fan blade assembly. Only when the gap w ranges from 2.5t1 to 3.5t1, the fan blade 1 is prevented from interfering with the guide ring 2 during rotation, and the leakage loss of the fan system is reduced.

[0062] The guide ring 2 further includes a planar guide section 24, which is disposed at one end of the first straight section 21 away from the second transition section 22. The planar guide section 24 is used to connect the guide ring 2 with a preset structure, thereby closing the air inlet on the preset structure, forcing the airflow to flow only through the inside of the guide ring 2 to the fan blade 1, ensuring the reliable operation of the fan blade assembly, and also allowing structures such as an electrical box to be installed on the planar guide section 24, facilitating the installation of other structures of the fan blade assembly. The distance h between the plane guide section 24 and the end of the second straight section 23 away from the second transition section 22 has a numerical range of 0.37R3 to 0.45R3, where R3 is the radius of the second straight section 23. The distance from the plane guide section 24 to the end of the second straight section 23 is limited to limit the airflow guiding distance of the guide ring 2. An excessively large h will increase the axial size and occupied space of the fan blade assembly, but will not increase the airflow guiding effect. An excessively small h will cause the airflow guiding effect to be reduced. Only when h is within a reasonable range can the height of the fan blade assembly be reduced to ensure the uniformity of air intake of the fan blade 1 while ensuring the reliable airflow guiding of the guide ring 2. Preferably, the numerical range of the axial length h1 of the second straight section 23 is 0.26h to 0.34h; the numerical range of the axial length h2 of the second transition section 22 is 0.3h to 0.38h; and the numerical range of the axial length h3 of the first straight section 21 is 0.28h to 0.36h. When the airflow flows through the first straight segment 21, the second transition segment 22 and the second straight segment 23 in sequence, the axial size of the guide ring 2 can be reduced as much as possible while ensuring a reliable guide effect, thereby reducing the axial size and occupied space of the fan blade assembly.

[0063] Along the gas flow direction, the flow area of ​​the second straight segment 23 gradually decreases, and the value range of the angle θ1 between the profile of the second straight segment 23 and the outlet end face of the second straight segment 23 is 90.5° to 92°. The flow area of ​​the second straight segment 23 is reduced, and the gas flow rate flowing to the fan blade 1 is increased, so as to prepare for the fan blade 1 to do work on the gas; along the gas flow direction, the flow area of ​​the first straight segment 21 gradually decreases, and the area of ​​the end of the first straight segment 21 away from the second straight segment 23 is larger, so that more gas can be introduced into the guide ring 2, and then under the effect of the gradual reduction of the flow area of ​​the first straight segment 21, the flow rate gradually increases, further preparing for the fan blade 1 to do work on the gas; preferably, the value range of the angle θ2 between the profile of the first straight segment 21 and the outlet end face of the first straight segment 21 is 135° to 145°. If the angle θ2 is too large, the first straight segment 21 will approach a plane, which will hinder the airflow and compress the space of the planar guide segment 24, affecting the rationality of the layout of other wiring and fixed line structures; if the angle θ2 is too small, the size of the end of the first straight segment 21 (the entrance of the guide ring 2) will be reduced, and the airflow entering the guide ring 2 will be reduced, affecting the working efficiency of the fan blade 1.

[0064] The second transition section 22 is a curved surface, which can smoothly transition between the first straight section 21 and the second straight section 23, avoiding the problem of increased local flow loss caused by non-smooth transition and reduced intake uniformity, making the attached airflow smoother and reducing flow loss. Similarly, a first transition section is also provided between the first straight section 21 and the planar guide section 24. The first transition section is a curved surface, making the airflow entering the first straight section 21 after flowing through the planar guide section 24 smoother, and can reliably adhere to the first straight section 21 to flow, reducing flow loss. At the same time, the first transition section can also prepare for the mold opening of the injection molded part to avoid abnormal problems such as shrinkage of sharp corners and depressions.

[0065] The fan blade 1 includes a blade 11 and a wheel cover 12, wherein the wheel cover 12 is arranged at one end of the blade 11 facing the guide ring 2, and the wheel cover 12 includes a wheel cover straight segment 121 and a wheel cover arc segment 122 connected in sequence, wherein the connection position of the wheel cover straight segment 121 and the wheel cover arc segment 122 is located between the blade 11 and the guide ring 2, and a part of the wheel cover straight segment 121 surrounds the outer periphery of the end of the guide ring 2, and the generation of leakage airflow is further limited by the cooperation between the wheel cover straight segment 121 and the end of the guide ring 2, thereby improving the workability of the fan blade 1. The wheel cover arc segment 122 gradually increases in diameter in the direction away from the wheel cover straight segment 121, and the wheel cover arc segment 122 is used to guide the mixed airflow formed by the leakage airflow and the mainstream, while reducing the impact of the leakage airflow on the main airflow of the fan blade 1, and the arc radius R2 of the wheel cover arc segment 122 has a value range of 0.15R1 to 0.23R1. When R2 is too large, the wheel cover 12 will cause the leakage airflow to be guided too far, occupying the outlet height of the fan blade 1, and the leakage airflow will cause turbulence, accumulation and other problems at the wheel cover 12. It will affect the work done by the fan blade 1. When R2 is too small, under the condition that the overall axial size of the fan blade 1 remains unchanged, the too short wheel cover arc segment 122 has insufficient ability to guide the airflow at the edge of the mainstream, which is easy to lose flow. The numerical range of the axial length a of the wheel cover straight segment 121 is 0.31R2 to 0.39R2. When a is too large, the wheel cover 12 will increase the size of the fan blade 1, the overall axial size of the fan blade 1 will increase, and the occupied space will increase. When a is too small, the size of the guide ring 2 extending into the fan blade 1 will decrease, the leakage air volume will increase, and the working efficiency of the fan will be affected. The value range of the distance b between the highest point of the blade 11 and the end face of the straight section 121 of the wheel cover close to the guide ring 2 is 0.55R2 to 0.63R2. By limiting the distance b, it is ensured that the guide ring 2 can be reliably inserted into the wheel cover 12 while the guide ring 2 will not interfere with the fan blade 1. When b is too large, the size of the fan blade 1 occupied by the wheel cover 12 will increase, and the overall axial size of the fan blade 1 will increase, which may cause dynamic and static interference problems. When b is too small, the size of the guide ring 2 inserted into the fan blade 1 will be reduced, the leakage air volume will increase, and the working efficiency of the fan will be affected.

[0066] An air conditioning unit comprises the above-mentioned fan blade assembly.

[0067] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A fan blade assembly, characterized in that: include: Wind blade (1); A guide ring (2), the guide ring (2) being located on the wind inlet side of the fan blade (1), and a portion of the guide ring (2) extending into the fan blade (1); A protruding structure (3), wherein the protruding structure (3) is arranged on the outer wall of the guide ring (2), and the protruding structure (3) is located outside the fan blade (1), a leakage channel (31) is formed between two adjacent protruding structures (3), and one end of the leakage channel (31) faces the fan blade (1); along the direction approaching the fan blade (1), the flow area of ​​the leakage channel (31) gradually decreases; the protruding structure (3) has a first end away from the fan blade (1) and a second end close to the fan blade (1), and along the direction from the first end to the second end, the width of the protruding structure (3) gradually increases; Along the direction approaching the wind blade (1), the height of the protruding structure (3) first increases and then decreases.

2. The fan blade assembly according to claim 1, characterized in that: The value range of the width n1 of the first end is t2 to 3t2, t2 being the wall thickness of the portion of the guide ring (2) extending into the wind blade (1); and / or the value range of the width n2 of the second end is 1.2n1 to 2n1.

3. The fan blade assembly according to claim 1, characterized in that: The value range of the distance n3 between the end of the protruding structure (3) close to the fan blade (1) and the fan blade (1) is 1.2t2 to 2.2t2, where t2 is the wall thickness of the part of the guide ring (2) extending into the fan blade (1).

4. The fan blade assembly according to claim 3, characterized in that: The fan blade assembly further comprises a reinforcing structure (4), wherein the reinforcing structure (4) is arranged at the end of the protruding structure (3) facing the fan blade (1), and a spacing n3 is formed between the end of the reinforcing structure (4) away from the protruding structure (3) and the fan blade (1), and a thickness n6 of the reinforcing structure (4) has a value ranging from t2 to 1.5t2.

5. The fan blade assembly according to claim 1, characterized in that: The maximum height n5 of the protruding structure (3) has a numerical range of 2.2t2 to 4.2t2, t2 being the wall thickness of the guide ring (2) extending into the wind blade (1); and / or the distance n4 between the highest point of the protruding structure (3) and the wind blade (1) has a numerical range of 4t2 to 8t2, t2 being the wall thickness of the guide ring (2) extending into the wind blade (1).

6. The fan blade assembly according to claim 5, characterized in that: Along a direction approaching the fan blade (1), the raised structure (3) comprises a gradually rising section (32) and a gradually falling section (33); the connection between the gradually rising section (32) and the gradually falling section (33) constitutes the highest point of the raised structure (3); and the value range of an angle θ4 between a plane where the side surface of the gradually falling section (33) away from the guide ring (2) is located and a plane where the side surface of the gradually rising section (32) away from the guide ring (2) is located is 110° to 130°.

7. The fan blade assembly according to claim 5, characterized in that: Along a direction approaching the fan blade (1), the raised structure (3) comprises a gradually rising section (32) and a gradually falling section (33); the connection between the gradually rising section (32) and the gradually falling section (33) constitutes the highest point of the raised structure (3); the side surface of the gradually rising section (32) away from the guide ring (2) is an arc surface; and an angle θ4 is formed between a tangent plane of the arc surface at the highest point of the raised structure (3) and a plane on which the side surface of the gradually falling section (33) away from the guide ring (2) is located.

8. The fan blade assembly according to claim 1, characterized in that: The midline of the protruding structure (3) is an arc, the radius R of the midline has a numerical range of 0.55R3 to 0.75R3, R3 being the radius of the end of the guide ring (2) extending into the wind blade (1); and / or the protruding structure (3) has a first end away from the wind blade (1) and a second end close to the wind blade (1), and the angle θ3 between a line connecting the endpoints of the midline at the first end and the endpoints at the second end and the central axis of the guide ring (2) has a numerical range of 10° to 20°.

9. The fan blade assembly according to claim 1, characterized in that: The value range of the angle γ formed by two adjacent protrusion structures (3) at the central axis of the guide ring (2) is 3° to 6°.

10. The fan blade assembly according to claim 1, characterized in that: The inner wall of the guide ring (2) is provided with guide grooves (5), and the guide grooves (5) correspond one to one with the protruding structures (3).

11. The fan blade assembly according to claim 10, characterized in that: The depth of the guide groove (5) gradually increases along the gas flow direction; and / or the maximum depth m3 of the guide groove (5) has a value ranging from 0.2t2 to 0.4t2, where t2 is the wall thickness of the guide ring (2) extending into the inner part of the fan blade (1).

12. The fan blade assembly according to claim 10, characterized in that: Along the gas flow direction, the width of the guide groove (5) gradually increases; and / or the width m1 of the inlet of the guide groove (5) has a numerical range of 0.8t2 to 2t2; and / or the width m2 of the outlet of the guide groove (5) has a numerical range of 1.5m1 to 2.5m1.

13. The fan blade assembly according to claim 10, characterized in that: The midline of the guide groove (5) is an arc, the radius R of the midline has a numerical range of 0.55R3 to 0.75R3, R3 being the radius of the end of the guide ring (2) extending into the fan blade (1); and / or the guide groove (5) has a first end away from the fan blade (1) and a second end close to the fan blade (1), and the angle θ3 between a line connecting the endpoints of the midline at the first end and the endpoints at the second end and the central axis of the guide ring (2) has a numerical range of 10° to 20°.

14. The fan blade assembly according to claim 1, characterized in that: Along the gas flow direction, the guide ring (2) comprises a first straight segment (21), a second transition segment (22) and a second straight segment (23) which are connected in sequence, a portion of the second straight segment (23) is located inside the fan blade (1), and the protruding structure (3) is arranged on the outer wall of the second transition segment (22) and the outer wall of the second straight segment (23).

15. The fan blade assembly according to claim 14, characterized in that: The value range of the length c of the second straight line segment (23) extending into the interior of the fan blade (1) is 0.5a to 0.7a, and the length c is greater than or equal to 2t1, a is the length of the wheel cover straight line segment (121) of the fan blade (1), and t1 is the wall thickness of the wheel cover (12) of the fan blade (1); and / or the range of the gap w between the second straight line segment (23) and the wheel cover straight line segment (121) of the fan blade (1) is 2.5t1 to 3.5t1.

16. The fan blade assembly according to claim 14, characterized in that: The guide ring (2) further comprises a planar guide section (24), the planar guide section (24) being arranged at an end of the first straight section (21) away from the second transition section (22), and a distance h between the planar guide section (24) and an end of the second straight section (23) away from the second transition section (22) having a value ranging from 0.37R3 to 0.45R3, where R3 is a radius of the second straight section (23).

17. The fan blade assembly according to claim 16, characterized in that: The numerical value range of the axial length h1 of the second straight segment (23) is 0.26h to 0.34h; and / or the numerical value range of the axial length h2 of the second transition segment (22) is 0.3h to 0.38h; and / or the numerical value range of the axial length h3 of the first straight segment (21) is 0.28h to 0.36h.

18. The fan blade assembly according to claim 14, characterized in that: Along the gas flow direction, the flow area of ​​the second straight line segment (23) gradually decreases, and the value range of the angle θ1 between the profile of the second straight line segment (23) and the outlet end face of the second straight line segment (23) is 90.5° to 92°; along the gas flow direction, the flow area of ​​the first straight line segment (21) gradually decreases, and the value range of the angle θ2 between the profile of the first straight line segment (21) and the outlet end face of the first straight line segment (21) is 135° to 145°.

19. The fan blade assembly according to claim 1, characterized in that: The fan blade (1) comprises a blade (11) and a wheel cover (12), wherein the wheel cover (12) is arranged at one end of the blade (11) facing the guide ring (2), and the wheel cover (12) comprises a wheel cover straight line segment (121) and a wheel cover arc segment (122) connected in sequence, wherein the connection position of the wheel cover straight line segment (121) and the wheel cover arc segment (122) is located between the blade (11) and the guide ring (2), and a portion of the wheel cover straight line segment (121) surrounds the outer periphery of the end of the guide ring (2), and the wheel cover arc segment (122) is connected to the blade (11) and the guide ring (2). The diameter of the line segment (122) gradually increases in a direction away from the wheel cover straight line segment (121), and the value range of the arc radius R2 of the wheel cover arc line segment (122) is 0.15R1 to 0.23R1; and / or, the value range of the axial length a of the wheel cover straight line segment (121) is 0.31R2 to 0.39R2; and / or, the value range of the distance b between the highest point of the blade (11) and the end surface of the wheel cover straight line segment (121) close to the guide ring (2) is 0.55R2 to 0.63R2.

20. An air conditioning unit, characterized in that: The invention comprises the fan blade assembly according to any one of claims 1 to 19.

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