Centrifugal wind wheel and air conditioner

Abstract

The invention discloses a centrifugal wind wheel and an air conditioner, and relates to the technical field of air conditioners. The centrifugal wind wheel comprises a fixing ring, a wheel body and a plurality of blades. The fixing ring and the wheel body are coaxially arranged at intervals, the multiple blades are arranged in an annular array and connected between the fixing ring and the wheel body, the cross section of each blade is arranged in a wing shape, and the chord length of the wing shape of each blade is gradually increased in the direction from the fixing ring to the wheel body. Compared with the prior art, the centrifugal wind wheel provided by the invention adopts the blades which are arranged in the wing shape and the chord length of the wing shape is gradually increased in the direction from the fixing ring to the wheel body, so that the air outlet amount can be increased, the air outlet efficiency can be improved, the air outlet effect can be enhanced, and the user experience can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to a centrifugal fan wheel and an air conditioner. Background Art

[0002] At present, with the improvement of living standards, air conditioners have become an indispensable household appliance in every family. Current air conditioners generally use a drive motor to drive the centrifugal fan to rotate to achieve the air outlet function. However, due to structural limitations, the traditional centrifugal fan has a small air outlet, resulting in poor air outlet effect of the air conditioner, affecting user experience. Summary of the invention

[0003] The problem solved by the present invention is how to increase the air output volume, improve the air output efficiency, enhance the air output effect, and improve the user experience.

[0004] To solve the above problems, the technical solution of the present invention is achieved as follows: In the first aspect, the present invention provides a centrifugal wind wheel, comprising a fixing ring, a wheel body and a plurality of blades, wherein the fixing ring and the wheel body are coaxial and spaced apart, the plurality of blades are arranged in an annular array and are all connected between the fixing ring and the wheel body, the cross section of the blade is arranged in an airfoil shape, and the chord length of the airfoil of the blade gradually increases in the direction from the fixing ring to the wheel body. Compared with the prior art, the centrifugal wind wheel provided by the present invention can increase the air output, improve the air output efficiency, enhance the air output effect, and improve the user experience because it adopts blades arranged in an airfoil shape and the chord length of the airfoil gradually increases in the direction from the fixing ring to the wheel body.

[0005] Furthermore, the blade is relatively provided with a leading edge and a trailing edge, and both the leading edge and the trailing edge are provided in a B-spline curve, and the airfoil of the blade is formed by stacking the leading edge and the trailing edge as stacking lines. The leading edge and the trailing edge provided in a B-spline curve can make the shape of the entire blade more in line with aerodynamic requirements, thereby increasing the work done by the blade on the air, thereby increasing the air output and improving the air output efficiency.

[0006] Furthermore, the expression of the curve of the leading edge is: (u)= ; In the formula, (i=0,1,2…,n) is the control vertex of the polygon, Corresponding to the control vertex The B-spline basis function of the trailing edge is expressed as: (u)= ; In the formula, (i=0,1,2…,n) is the control vertex of the polygon, Corresponding to the control vertex Reasonable expressions of the B-spline curves of the leading edge and the trailing edge can further improve the wind-guiding effect of the blade and increase the air output.

[0007] Furthermore, the expression of the B-spline basis function is: ; In the formula, k is the power of B-spline, i is the sequence number, A reasonable B-spline basis function can ensure the air volume of the centrifugal wind wheel, enhance the air outlet effect, and facilitate the production and processing of the blades.

[0008] Furthermore, the blade is provided with a suction surface and a pressure surface, both of which are convex in the same direction, and the suction surface is provided outside the pressure surface, and both of which are provided between the leading edge and the trailing edge. The suction surface is provided with a drainage groove, which is provided along the length direction of the blade, and the distance between the drainage groove and the leading edge is greater than the distance between the drainage groove and the trailing edge. That is, the drainage groove is provided on the second half of the path where the air flows on the suction surface, so that the air can be prevented from vortexing and falling off on the second half of the path, thereby ensuring the air volume and reducing wind noise.

[0009] Furthermore, the suction surface includes an air induction surface segment and an extension surface segment, the leading edge is connected to the trailing edge through the air induction surface segment and the extension surface segment in sequence, the cross section of the air induction surface segment is curved, the cross section of the extension surface segment is straight, and the drainage groove is provided on the air induction surface segment. The drainage groove is located on the second half of the path of the air flowing on the air induction surface segment to avoid the air from vortexing and falling off, ensuring the air output and reducing wind noise.

[0010] Furthermore, the ratio of the opening width of the drainage groove to the cross-sectional curve length of the air inducing surface segment is in the range of 0.06 to 0.08. A reasonable ratio of the opening width of the drainage groove to the cross-sectional curve length of the air inducing surface segment can improve the drainage effect of the drainage groove, ensure that the drainage groove can absorb the low-energy fluid in the boundary layer, and thus avoid vortex shedding.

[0011] Furthermore, on the cross section of the air inducing surface segment, a preset curve is formed between the leading edge and a side wall of the air inducing groove close to the leading edge, and the ratio of the length of the preset curve to the length of the cross section curve of the air inducing surface segment is in the range of 0.6 to 0.7. A reasonable ratio of the length of the preset curve to the length of the cross section curve of the air inducing surface segment can ensure that the air inducing groove is located at a reasonable position on the path of the rear half of the air inducing surface segment, thereby avoiding vortex shedding.

[0012] Furthermore, the wheel body includes a connecting ring and a hub, the hub is connected to the inner side of the connecting ring and is extended toward the direction close to the fixed ring, one end of the blade is connected to the connecting ring and is flush with the outer edge of the connecting ring, and the other end of the blade is connected to the inner side of the fixed ring, and the outer diameter of the connecting ring is larger than the inner diameter of the fixed ring. This is to adapt to the shape of the blade, ensure that the blade can be stably connected between the fixed ring and the connecting ring, improve the connection strength, and prevent the blade from loosening or falling off.

[0013] Furthermore, the centrifugal wind wheel further comprises a first wind shielding ring and a second wind shielding ring, wherein the first wind shielding ring is connected to the fixing ring and is extended in a direction away from the wheel body, and the second wind shielding ring is connected to the wheel body and is extended in a direction away from the fixing ring. The first wind shielding ring and the second wind shielding ring work together to prevent air from flowing back to the centrifugal wind wheel from both ends, thereby ensuring the air output, improving the air output efficiency, and enhancing the air output effect.

[0014] In a second aspect, the present invention provides an air conditioner, comprising a driving motor, a volute, and the above-mentioned centrifugal wind wheel, the centrifugal wind wheel comprising a fixing ring, a wheel body, and a plurality of blades, the fixing ring and the wheel body are coaxial and spaced, the plurality of blades are arranged in a ring array, and are all connected between the fixing ring and the wheel body, the cross section of the blade is arranged in an airfoil shape, the chord length of the airfoil shape of the blade gradually increases in the direction from the fixing ring to the wheel body, the centrifugal wind wheel is rotatably installed in the volute, and the driving motor is connected to the wheel body. The air conditioner can increase the air output, improve the air output efficiency, enhance the air output effect, and improve the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of a centrifugal wind wheel in the prior art applied to a centrifugal fan; Figure 2 It is a structural schematic diagram of a centrifugal wind wheel in the prior art; Figure 3 It is a schematic diagram of the structure of the blades in the centrifugal wind wheel of the prior art guiding the airflow; Figure 4 is a schematic structural diagram of the centrifugal wind wheel according to the first embodiment of the present invention applied to a centrifugal fan; Figure 5 is a schematic structural diagram of a centrifugal wind wheel according to the first embodiment of the present invention from one viewing angle; Figure 6 is a schematic structural diagram of the centrifugal wind wheel according to the first embodiment of the present invention from another perspective; Figure 7 is a mathematical model diagram of the blades in the centrifugal wind wheel according to the first embodiment of the present invention at the design stage; Figure 8 is a schematic structural diagram of blades in a centrifugal wind wheel according to the first embodiment of the present invention; Fig. 9 yes Figure 8 A partial enlarged view of middle IX; Fig.10 It is a mathematical model diagram of the cross section of the blades in the centrifugal wind wheel described in the first embodiment of the present invention.

[0016] Description of reference numerals: 10-centrifugal fan; 100-centrifugal wind wheel; 110-fixing ring; 120-wheel body; 121-connecting ring; 122-wheel hub; 130-first wind shield ring; 140-second wind shield ring; 150-blade; 151-leading edge; 152-trailing edge; 153-suction surface; 1531-wind-inducing surface section; 1532-extension surface section; 154-pressure surface; 155-drainage groove; 160-air outlet; 200-drive motor; 300-volute. DETAILED DESCRIPTION

[0017] Please refer to Figures 1 to 3 ( Figure 3 The arrow in the figure indicates the direction of air flow). In the prior art, the centrifugal fan wheel is usually in a straight cylindrical shape, that is, the diameter of the centrifugal fan wheel is consistent in its axial direction, wherein the blades in the centrifugal fan wheel are bent, the cross section of the blades is arc-shaped, the length direction of the blades is the axial direction of the centrifugal fan wheel, and the width direction of the blades is the chord length direction of the arc-shaped cross section of the blades. Specifically, the width of the blades is consistent in its length direction, that is, the width of the blades does not change in the axial direction of the centrifugal fan wheel.

[0018] The inventor has found that in the process of the centrifugal wind wheel rotating to discharge air, the air enters the centrifugal wind wheel along the axial direction of the centrifugal wind wheel, and is blown outward along the radial direction of the centrifugal wind wheel under the action of centrifugal force. In this process, the front and rear halves of the blade in the length direction (the air first flows through the front half of the blade and then flows through the rear half of the blade) do different amounts of work on the air. The work done by the rear half of the blade on the air is much greater than the work done by the front half of the blade on the air. Since the widths of the front and rear halves of the blade are the same, the air introduced from the front half of the blade cannot be completely blown out under the guidance of the rear half of the blade due to the width dimension limitation of the rear half of the blade, resulting in a smaller air output. In this regard, the present application provides a centrifugal wind wheel, in which the cross-section of the blade is arranged in an airfoil shape, and the chord length of the airfoil of the blade gradually increases in the direction from the fixing ring to the wheel body, that is, the width of the blade gradually increases in its length direction, so that the average width of the rear half of the blade is greater than the average width of the front half of the blade, ensuring that the air introduced from the front half of the blade can be completely blown out under the guiding action of the rear half of the blade, thereby increasing the air output.

[0019] In addition, in the prior art, when air flows through the blade surface of a centrifugal wind wheel, due to the effect of low-energy fluid in the boundary layer and adverse pressure gradient, vortex shedding will occur in the rear half of the suction surface of the blade, thereby causing turbulent noise, and also worsening the flow condition of the downstream airflow, resulting in loss of air volume. In response to this, the present application provides a centrifugal wind wheel, in which a drainage groove is provided on the suction surface of the blade, and the drainage groove can absorb the low-energy fluid in the boundary layer to inhibit the separation of the boundary layer and increase the turning angle of the airflow, thereby avoiding the vortex shedding of air in the rear half of the suction surface of the blade, reducing wind noise, and the drainage groove can also ensure the smooth flow of the downstream airflow to avoid loss of air volume.

[0020] In addition, in the prior art, the centrifugal wind wheel is rotatably installed in the volute, the driving motor is connected to the centrifugal wind wheel, and the centrifugal wind wheel, the volute and the driving motor together constitute a centrifugal fan, wherein there is a large gap between the two ends of the centrifugal wind wheel along its axial direction (the front end and the rear end, air flows into the centrifugal wind wheel from the front end) and the volute. In this way, when the air enters the centrifugal wind wheel along the axial direction of the centrifugal wind wheel, since the air cannot immediately change from axial to radial flow when it just enters the centrifugal wind wheel, and there is a large gap between the front end of the centrifugal wind wheel and the volute, the air will form a low-speed vortex at the front end of the centrifugal wind wheel after flowing out of the centrifugal wind wheel, and escape from the gap between the front end of the centrifugal wind wheel and the volute and return to the centrifugal wind wheel, causing air volume loss; and since there is a large gap between the rear end of the centrifugal wind wheel and the volute, the air will flow through the gap between the rear end of the centrifugal wind wheel and the volute and the hub hole (opened on the hub of the centrifugal wind wheel) in sequence after flowing out of the centrifugal wind wheel, and return to the centrifugal wind wheel, further causing air volume loss. In this regard, the present application provides a centrifugal wind wheel with wind shields extending from both ends thereof to reduce the gap between the two ends of the centrifugal wind wheel and the volute, thereby preventing air from flowing back to the centrifugal wind wheel from both ends of the centrifugal wind wheel and ensuring the air output.

[0021] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0022] First embodiment Please refer to Figures 4 to 6 ( Figure 4 The arrow in the figure indicates the direction of air flow). The embodiment of the present invention provides a centrifugal wind wheel 100 for realizing the air outlet function. It can increase the air outlet volume, improve the air outlet efficiency, enhance the air outlet effect, and improve the user experience.

[0023] It should be noted that the centrifugal wind wheel 100 is applied to the centrifugal fan 10, and the centrifugal fan 10 includes a drive motor 200, a volute 300 and a centrifugal wind wheel 100. The drive motor 200 is in transmission connection with the centrifugal wind wheel 100, and the centrifugal wind wheel 100 is rotatably installed in the volute 300. The drive motor 200 can drive the centrifugal wind wheel 100 to rotate relative to the volute 300, so that the centrifugal wind wheel 100 generates negative pressure and drives air flow, thereby forming an outlet airflow in the volute 300.

[0024] The centrifugal wind wheel 100 includes a fixing ring 110, a wheel body 120, a first wind shielding ring 130, a second wind shielding ring 140 and a plurality of blades 150. The fixing ring 110 and the wheel body 120 are coaxial and arranged in parallel and spaced apart. The plurality of blades 150 are arranged in an annular array and are all connected between the fixing ring 110 and the wheel body 120. The fixing ring 110 and the wheel body 120 work together to fix the relative position of the blades 150 and prevent the blades 150 from falling off. The driving motor 200 is connected to the wheel body 120. The driving motor 200 can synchronously drive the blades 150 and the fixing ring 110 to rotate through the wheel body 120. The blades 150 are used to guide the air to realize the air outlet function of the centrifugal wind wheel 100. Specifically, the fixing ring 110, the wheel body 120 and two adjacent blades 150 together form an air outlet 160, and multiple air outlets 160 are formed between the multiple blades 150. During the rotation of the centrifugal wind wheel 100, the air passes through the fixing ring 110 along the axial direction of the centrifugal wind wheel 100 and enters between the multiple blades 150, and then blows outward through the multiple air outlets 160 along the radial direction of the centrifugal wind wheel 100 at the same time, so as to realize the air outlet function of the centrifugal wind wheel 100. During this process, the blades 150 do work on the air, so that the air changes its flow direction under the action of centrifugal force, so that the air flowing into the centrifugal wind wheel 100 along the axial direction of the centrifugal wind wheel 100 is blown outward along the radial direction of the centrifugal wind wheel 100.

[0025] Furthermore, the cross-section of the blade 150 is arranged in an airfoil shape, and the chord length of the airfoil of the blade 150 gradually increases in the direction from the fixing ring 110 to the wheel body 120, that is, the cross-sectional area of ​​the airfoil of the blade 150 gradually increases in the direction from the fixing ring 110 to the wheel body 120. In this way, the width of the blade 150 gradually increases in its length direction, so that the average width of the rear half of the blade 150 is greater than the average width of the front half of the blade 150, ensuring that the air introduced from the front half of the blade 150 can be completely blown out under the guidance of the rear half of the blade 150, thereby increasing the air output, improving the air output efficiency, enhancing the air output effect, and improving the user experience.

[0026] It should be noted that the first wind shield 130 is connected to the fixing ring 110 and is extended in a direction away from the wheel body 120, that is, the first wind shield 130 is arranged at the front end of the centrifugal wind wheel 100, and the first wind shield 130 is used to reduce the gap between the front end of the centrifugal wind wheel 100 and the volute 300 to avoid the air from flowing back at the front end of the centrifugal wind wheel 100; the second wind shield 140 is connected to the wheel body 120 and is extended in a direction away from the fixing ring 110, that is, the second wind shield 140 is arranged at the rear end of the centrifugal wind wheel 100, and the second wind shield 140 is used to reduce the gap between the rear end of the centrifugal wind wheel 100 and the volute 300 to avoid the air from flowing back at the rear end of the centrifugal wind wheel 100; the first wind shield 130 and the second wind shield 140 work together to avoid the air from flowing back to the centrifugal wind wheel 100 from both ends of the centrifugal wind wheel 100, thereby ensuring the air output, improving the air output efficiency, and enhancing the air output effect.

[0027] In this embodiment, the first wind shielding ring 130 and the fixing ring 110 are integrally formed, and the second wind shielding ring 140 and the wheel body 120 are integrally formed to improve the connection strength.

[0028] Please refer to Figure 7 It is worth noting that the blade 150 is relatively provided with a leading edge 151 and a trailing edge 152, and the rotation direction of the blade 150 is from the trailing edge 152 to the leading edge 151, that is, when the blade 150 rotates, the air flows from the leading edge 151 to the trailing edge 152 relative to the blade 150. Further, the leading edge 151 and the trailing edge 152 are both arranged in a B-spline curve, and the airfoil of the blade 150 is formed by stacking the leading edge 151 and the trailing edge 152 as stacking lines. The leading edge 151 and the trailing edge 152 arranged in a B-spline curve can make the shape of the entire blade 150 more in line with aerodynamic requirements, thereby increasing the work done by the blade 150 on the air, thereby increasing the air output and improving the air output efficiency.

[0029] In this embodiment, the expression of the B-spline curve presented by the leading edge 151 is: (u)= ; In the formula, (i=0,1,2…,n) is the control vertex of the polygon, and the polyline formed by connecting multiple control vertices in sequence is the B-spline control polygon; Corresponding to the control vertex Correspondingly, the expression of the B-spline curve presented by the trailing edge 152 is: (u)= ; In the formula, (i=0,1,2…,n) is the control vertex of the polygon, and the polyline formed by connecting multiple control vertices in sequence is the B-spline control polygon; Corresponding to the control vertex Reasonable expressions of the B-spline curve presented by the leading edge 151 and the B-spline curve presented by the trailing edge 152 can further improve the wind guiding effect of the blade 150 and increase the air output.

[0030] Specifically, the expression of the B-spline basis function is: ; In the formula, k is the power of B-spline, i is the sequence number, A reasonable B-spline basis function can ensure the air volume of the centrifugal wind wheel 100, enhance the air outlet effect, and facilitate the production and processing of the blades 150.

[0031] Please refer to Figures 8 to 10 It should be noted that the blade 150 is relatively provided with a suction surface 153 and a pressure surface 154, and both the suction surface 153 and the pressure surface 154 are used to provide the wind flow to pass through, so as to achieve the air diversion function. The suction surface 153 and the pressure surface 154 are both convexly arranged in the same direction, and the suction surface 153 is arranged on the outside of the pressure surface 154, and the suction surface 153 and the pressure surface 154 are both arranged between the leading edge 151 and the trailing edge 152. When the centrifugal wind wheel 100 rotates, the air flows on the suction surface 153 and the pressure surface 154 at the same time, and the flow direction is from the leading edge 151 to the trailing edge 152. Specifically, the suction surface 153 is provided with a drainage groove 155, which extends along the length direction of the blade 150. The distance between the drainage groove 155 and the leading edge 151 is greater than the distance between the drainage groove 155 and the trailing edge 152. That is, the drainage groove 155 is arranged on the rear half of the path where the air flows on the suction surface 153. In this way, the air can be prevented from vortexing and falling off in the rear half of the path, thereby ensuring the air output and reducing wind noise.

[0032] In this embodiment, a drainage groove 155 is provided on the suction surface 153, and the drainage groove 155 is used to absorb the low-energy fluid in the boundary layer to inhibit the separation of the boundary layer, increase the airflow turning angle, thereby preventing the generation of vortex shedding and reducing wind noise, and the drainage groove 155 can also ensure the smooth flow of downstream airflow, avoid causing air volume loss, ensure the air volume, and improve the air output efficiency. However, it is not limited to this. In other embodiments, slits or holes can also be opened on the suction surface 153, which can also absorb the low-energy fluid in the boundary layer and ensure the air volume.

[0033] The suction surface 153 includes an air induction surface segment 1531 and an extension surface segment 1532. The leading edge 151 is connected to the trailing edge 152 via the air induction surface segment 1531 and the extension surface segment 1532 in sequence, that is, the air induction surface segment 1531 is connected to the leading edge 151, and the extension surface segment 1532 is connected to the trailing edge 152. Specifically, the cross-section of the air-inducing surface segment 1531 is curved, and the air-inducing surface segment 1531 with a curved cross-section can guide the air stably, so that the air flows outward along the air-inducing surface segment 1531; the cross-section of the extension surface segment 1532 is straight, and the extension surface segment 1532 with a straight cross-section can compress the air flowing out along the air-inducing surface segment 1531, and throw it out radially along the centrifugal wind wheel 100 to ensure the air outlet efficiency; the guide groove 155 is opened on the air-inducing surface segment 1531, and is located on the latter half of the path of the air flowing on the air-inducing surface segment 1531, so as to avoid the air from vortexing and falling off, thereby ensuring the air outlet volume and reducing wind noise.

[0034] Furthermore, the ratio of the opening width of the drainage groove 155 to the cross-sectional curve length of the wind-inducing surface segment 1531 ranges from 0.06 to 0.08. A reasonable ratio of the opening width of the drainage groove 155 to the cross-sectional curve length of the wind-inducing surface segment 1531 can improve the drainage effect of the drainage groove 155, and ensure that the drainage groove 155 can absorb the low-energy fluid in the boundary layer, thereby avoiding vortex shedding.

[0035] In this embodiment, the ratio of the opening width of the drainage groove 155 to the cross-sectional curve length of the air-inducing surface segment 1531 is 0.07, but it is not limited to this. In other embodiments, the ratio of the opening width of the drainage groove 155 to the cross-sectional curve length of the air-inducing surface segment 1531 can be 0.06 or 0.08. There is no specific limitation on the ratio of the opening width of the drainage groove 155 to the cross-sectional curve length of the air-inducing surface segment 1531.

[0036] Furthermore, on the cross-section of the air-inducing surface segment 1531, a preset curve is formed between the leading edge 151 and a side wall of the drainage groove 155 close to the leading edge 151, and the ratio of the length of the preset curve to the length of the cross-sectional curve of the air-inducing surface segment 1531 is in the range of 0.6 to 0.7. A reasonable ratio of the length of the preset curve to the length of the cross-sectional curve of the air-inducing surface segment 1531 can ensure that the drainage groove 155 is located at a reasonable position on the rear half of the path of the air-inducing surface segment 1531, thereby avoiding vortex shedding.

[0037] In this embodiment, the ratio of the length of the preset curve to the length of the cross-sectional curve of the wind-inducing surface segment 1531 is 0.65, but is not limited to this. In other embodiments, the ratio of the length of the preset curve to the length of the cross-sectional curve of the wind-inducing surface segment 1531 can be 0.6 or 0.7, and there is no specific limitation on the ratio of the length of the preset curve to the length of the cross-sectional curve of the wind-inducing surface segment 1531.

[0038] For ease of understanding, the opening width of the drainage groove 155 is represented as a, the length of the cross-sectional curve of the air inducing surface segment 1531 is represented as b, and the length of the preset curve is represented as c.

[0039] Please continue to refer to Figure 6 The wheel body 120 includes a connecting ring 121 and a hub 122. The hub 122 is connected to the inner side of the connecting ring 121 and is extended in the direction close to the fixing ring 110, that is, the hub 122 is arranged between the plurality of blades 150. The hub 122 is used to connect with the driving motor 200. The driving motor 200 can drive the connecting ring 121 to rotate through the hub 122, thereby driving the blades 150 and the fixing ring 110 to rotate. One end of the blade 150 is connected to the connecting ring 121 and is flush with the outer edge of the connecting ring 121. The other end of the blade 150 is connected to the inner side of the fixing ring 110 to improve the stability of the entire centrifugal wind wheel 100 structure and ensure the wind output effect. Specifically, the outer diameter of the connecting ring 121 is larger than the inner diameter of the fixing ring 110 to adapt to the shape of the blade 150 (the chord length of the airfoil of the blade 150 gradually increases in the direction from the fixing ring 110 to the connecting ring 121, that is, the width of the end of the blade 150 close to the fixing ring 110 is smaller, and the width of the end of the blade 150 close to the connecting ring 121 is larger), ensuring that the blade 150 can be stably connected between the fixing ring 110 and the connecting ring 121, improving the connection strength, and preventing the blade 150 from loosening or falling off.

[0040] In the centrifugal wind wheel 100 described in the embodiment of the present invention, the fixing ring 110 and the wheel body 120 are coaxial and spaced apart, a plurality of blades 150 are arranged in an annular array and are all connected between the fixing ring 110 and the wheel body 120, the cross section of the blades 150 is arranged in an airfoil shape, and the chord length of the airfoil of the blades 150 gradually increases in the direction from the fixing ring 110 to the wheel body 120. Compared with the prior art, the centrifugal wind wheel 100 provided by the present invention uses the blades 150 arranged in an airfoil shape and the chord length of the airfoil gradually increases in the direction from the fixing ring 110 to the wheel body 120, so it can increase the air output, improve the air output efficiency, enhance the air output effect, and improve the user experience.

[0041] Second embodiment The present invention provides an air conditioner (not shown) for controlling indoor temperature. The air conditioner includes a centrifugal fan 10 and an air conditioner body (not shown). The centrifugal fan 10 includes a drive motor 200, a volute 300 and a centrifugal fan wheel 100. The basic structure and principle of the centrifugal fan wheel 100 and the technical effect produced are the same as those of the first embodiment. For the sake of brief description, for the parts not mentioned in this embodiment, reference may be made to the corresponding contents in the first embodiment.

[0042] In this embodiment, the air conditioner is a fresh air blower, a dehumidifier or a mobile air conditioner, etc. The centrifugal fan 10 is installed in the air conditioner body, and the centrifugal fan 10 is used to generate negative pressure to drive air flow, thereby forming an outlet air flow, and then realizing a fresh air function, a dehumidification function or a temperature adjustment function. Specifically, the centrifugal wind wheel 100 is rotatably installed in the volute 300, the drive motor 200 is installed on the volute 300, and is arranged through the volute 300, the drive motor 200 is connected to the centrifugal wind wheel 100, and the drive motor 200 can drive the centrifugal wind wheel 100 to rotate relative to the volute 300, so that the centrifugal wind wheel 100 generates negative pressure and drives air flow, thereby forming an outlet air flow in the volute 300.

[0043] The beneficial effects of the air conditioner described in the embodiment of the present invention are the same as those of the first embodiment, and will not be described in detail herein.

[0044] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the scope defined by the claims.

Claims

1. A centrifugal wind wheel, characterized in that: The invention comprises a fixing ring (110), a wheel body (120), and a plurality of blades (150); the fixing ring (110) and the wheel body (120) are coaxial and spaced apart; the plurality of blades (150) are arranged in an annular array and are all connected between the fixing ring (110) and the wheel body (120); the cross section of the blades (150) is arranged in an airfoil shape; and the chord length of the airfoil shape of the blades (150) gradually increases in a direction from the fixing ring (110) to the wheel body (120).

2. The centrifugal wind wheel according to claim 1, characterized in that: The blade (150) is provided with a leading edge (151) and a trailing edge (152) opposite to each other, the leading edge (151) and the trailing edge (152) are both provided in the form of a B-spline curve, and the airfoil of the blade (150) is formed by stacking the leading edge (151) and the trailing edge (152) as stacking lines.

3. The centrifugal wind wheel according to claim 2, characterized in that: The expression of the curve presented by the leading edge (151) is: (u)= ; In the formula, (i=0,1,2…,n) is the control vertex of the polygon, Corresponding to the control vertex B-spline basis functions of ; The expression of the curve presented by the trailing edge (152) is: (u)= ; In the formula, (i=0,1,2…,n) is the control vertex of the polygon, Corresponding to the control vertex B-spline basis functions.

4. The centrifugal wind wheel according to claim 3, characterized in that: The expression of the B-spline basis function is: ； In the formula, k is the power of B-spline, i is the sequence number, For the node.

5. The centrifugal wind wheel according to claim 2, characterized in that: The blade (150) is provided with a suction surface (153) and a pressure surface (154) opposite to each other. The suction surface (153) and the pressure surface (154) are both arranged to protrude in the same direction, and the suction surface (153) is arranged on the outside of the pressure surface (154). The suction surface (153) and the pressure surface (154) are both arranged between the leading edge (151) and the trailing edge (152). The suction surface (153) is provided with a drainage groove (155). The drainage groove (155) is extended along the length direction of the blade (150), and the distance between the drainage groove (155) and the leading edge (151) is greater than the distance between the drainage groove (155) and the trailing edge (152).

6. The centrifugal wind wheel according to claim 5, characterized in that: The suction surface (153) comprises an air inducing surface segment (1531) and an extension surface segment (1532); the leading edge (151) is connected to the trailing edge (152) via the air inducing surface segment (1531) and the extension surface segment (1532) in sequence; the cross section of the air inducing surface segment (1531) is curved, the cross section of the extension surface segment (1532) is straight, and the drainage groove (155) is provided on the air inducing surface segment (1531).

7. The centrifugal wind wheel according to claim 6, characterized in that: The ratio of the opening width of the drainage groove (155) to the cross-sectional curve length of the air inducing surface segment (1531) is in the range of 0.06 to 0.

08.

8. The centrifugal wind wheel according to claim 6, characterized in that: On the cross section of the air inducing surface segment (1531), a preset curve is formed between the leading edge (151) and a side wall of the drainage groove (155) close to the leading edge (151), and the ratio of the length of the preset curve to the length of the cross section curve of the air inducing surface segment (1531) is in the range of 0.6 to 0.

7.

9. The centrifugal wind wheel according to claim 1, characterized in that: The wheel body (120) comprises a connecting ring (121) and a hub (122); the hub (122) is connected to the inner side of the connecting ring (121) and is extended in a direction close to the fixing ring (110); one end of the blade (150) is connected to the connecting ring (121) and is flush with the outer edge of the connecting ring (121); the other end of the blade (150) is connected to the inner side of the fixing ring (110); and the outer diameter of the connecting ring (121) is greater than the inner diameter of the fixing ring (110).

10. The centrifugal wind wheel according to claim 1, characterized in that: The centrifugal wind wheel further comprises a first wind shield ring (130) and a second wind shield ring (140); the first wind shield ring (130) is connected to the fixing ring (110) and is extended in a direction away from the wheel body (120); and the second wind shield ring (140) is connected to the wheel body (120) and is extended in a direction away from the fixing ring (110).

11. An air conditioner, characterized in that: It comprises a driving motor (200), a volute (300), and a centrifugal wind wheel according to any one of claims 1 to 10, wherein the centrifugal wind wheel is rotatably mounted in the volute (300), and the driving motor (200) is connected to the wheel body (120).

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