CN220929753U - Centrifugal wind wheel and air conditioner - Google Patents

Abstract

The utility model discloses a centrifugal wind wheel and an air conditioner, and relates to the technical field of air conditioners. The centrifugal wind wheel comprises a fixed ring, a wheel body and a plurality of blades. The fixed ring and the wheel body are coaxial and arranged at intervals, the blades are arranged in an annular array and are connected between the fixed ring and the wheel body, the cross sections of the blades are in airfoil-shaped arrangement, and the chord length of the airfoil shape of the blade is gradually increased in the direction from the fixed ring to the wheel body. Compared with the prior art, the centrifugal wind wheel provided by the utility model has the advantages that 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 fixed ring to the wheel body are adopted, so that the air output can be increased, the air output efficiency is improved, the air output effect is enhanced, and the user experience is improved.

Description

Centrifugal wind wheel and air conditioner

Technical Field

The utility model relates to the technical field of air conditioners, in particular to a centrifugal wind wheel and an air conditioner.

Background

Currently, with the improvement of living standard, an air conditioner has become an indispensable home appliance in various households. The conventional air conditioner generally utilizes a driving motor to drive a centrifugal wind wheel to rotate so as to realize an air outlet function, and the traditional centrifugal wind wheel is smaller in air outlet quantity due to structural limitation, so that the air outlet effect of the air conditioner is poor, and the user experience is influenced.

Disclosure of utility model

The utility model solves the problem of how to increase the air output, improve the air output efficiency, enhance the air output effect and improve the user experience.

In order to solve the problems, the technical scheme of the utility model is realized as follows:

In a first aspect, the utility model provides a centrifugal wind wheel, which comprises a fixed ring, a wheel body and a plurality of blades, wherein the fixed ring and the wheel body are coaxial and are arranged at intervals, the plurality of blades are arranged in an annular array and are connected between the fixed ring and the wheel body, the cross sections of the blades are arranged in an airfoil shape, and the chord length of the airfoil shape of the blades is gradually increased in the direction from the fixed ring to the wheel body. Compared with the prior art, the centrifugal wind wheel provided by the utility model has the advantages that 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 fixed ring to the wheel body are adopted, so that the air output can be increased, the air output efficiency is improved, the air output effect is enhanced, and the user experience is improved.

Further, the blade is relatively provided with a leading edge and a trailing edge, the leading edge and the trailing edge are both arranged in a B-spline curve, and the airfoil profile of the blade is formed by stacking the leading edge and the trailing edge as stacking lines. The leading edge and the trailing edge which are arranged in the B spline curve can enable the shape of the whole blade to be more in line with aerodynamic requirements, so that the work of the blade on air is improved, the air output is increased, and the air output efficiency is improved.

Further, the leading edge is represented by the following curve:(u)=/> ; in the/> (I=0, 1,2 …, n) is the control vertex of a polygon,/>To correspond to control vertex/>B spline basis functions of (2); the trailing edge is represented by the following curve: /(I)(u)=/>; In the/>(I=0, 1,2 …, n) is the control vertex of a polygon,/>To correspond to control vertex/>B-spline basis functions of (2). The reasonable expression of the B-spline curve of the front edge and the B-spline curve of the tail edge can further improve the wind guiding effect of the blade and increase the wind output.

Further, the expression of the B-spline basis function is:

；

Where k is the power of the B-spline, i is the sequence number, Is a node. The reasonable B spline basis function can ensure the air output of the centrifugal wind wheel, enhance the air output effect and facilitate the production and processing of the blades.

Further, the blade is provided with suction face and pressure face relatively, and suction face and pressure face all are towards same direction protrusion setting, and suction face sets up in the outside of pressure face, and suction face and pressure face all set up between leading edge and trailing edge, and the drainage groove has been seted up to the suction face, and the drainage groove extends along the length direction of blade and sets up, and the interval of drainage groove and leading edge is greater than the interval of drainage groove and trailing edge. The drainage groove is arranged on the second-half path of the air flowing on the suction surface, so that the condition that the air falls off due to vortex on the second-half path can be avoided, the air output is ensured, and the wind noise is reduced.

Further, the suction surface comprises an induced draft surface section and an extension surface section, the front edge is connected with the tail edge sequentially through the induced draft surface section and the extension surface section, the cross section of the induced draft surface section is in a curve shape, the cross section of the extension surface section is in a straight line shape, and the induced draft groove is formed in the induced draft surface section. The drainage groove is positioned on the path of the second half section of the air flowing on the induced air surface section so as to avoid the condition that the air generates vortex and falls off, ensure the air output and reduce the wind noise.

Further, the ratio of the opening width of the induced flow groove to the cross-sectional curve length of the induced draft fan section is in the range of 0.06 to 0.08. The ratio of the reasonable opening width of the drainage groove to the cross section curve length of the induced air surface section can improve the drainage effect of the drainage groove, ensure that the drainage groove can absorb low-energy fluid in the attached surface layer, and avoid vortex shedding.

Further, on the cross section of the induced draft fan section, a preset curve is formed between the front edge and a side wall of the induced draft groove, which is close to the front edge, and the ratio of the length of the preset curve to the length of the cross section curve of the induced draft fan section is in the range of 0.6 to 0.7. The ratio of the length of the reasonable preset curve to the length of the cross section curve of the induced air surface section can ensure that the induced flow groove is positioned at a reasonable position on the path of the second half section of the induced air surface section, and vortex shedding is avoided.

Further, the wheel body comprises a connecting ring and a wheel hub, the wheel hub is connected to the inner side of the connecting ring and extends towards the direction close to the fixed ring, one end of each blade is connected to the connecting ring and is flush with the outer side edge of the connecting ring, the other end of each 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. In order to adapt to the shape of blade, guarantee that the blade can be connected between solid fixed ring and go-between steadily, improve joint strength, prevent that the blade from becoming flexible or the condition that drops from taking place.

Further, centrifugal wind wheel still includes first deep bead and second deep bead, and first deep bead is connected with solid fixed ring, and extends the setting towards the direction of keeping away from the wheel body, and second deep bead is connected with the wheel body, and extends the setting towards the direction of keeping away from solid fixed ring. The first wind shielding ring and the second wind shielding ring act together to avoid the condition that air flows back to the centrifugal wind wheel from the both ends of the centrifugal wind wheel, guarantee the air-out volume, improve air-out efficiency, strengthen the air-out effect.

The utility model provides an air conditioner, which comprises a driving motor, a volute and the centrifugal wind wheel, wherein the centrifugal wind wheel comprises a fixed ring, a wheel body and a plurality of blades, the fixed ring and the wheel body are coaxial and are arranged at intervals, the blades are arranged in an annular array and are connected between the fixed ring and the wheel body, the cross sections of the blades are in airfoil-shaped arrangement, the chord length of the airfoil shape of the blade is gradually increased in the direction from the fixed ring to the wheel body, the centrifugal wind wheel is rotatably arranged in the volute, and the driving motor is connected with the wheel body. The air conditioner can increase the air output, improve the air output efficiency, strengthen the air output effect, promote user experience.

Drawings

FIG. 1 is a schematic diagram of a prior art centrifugal wind wheel applied to a centrifugal fan;

FIG. 2 is a schematic view of a prior art centrifugal wind wheel;

FIG. 3 is a schematic view of a prior art centrifugal rotor in which blades direct airflow;

Fig. 4 is a schematic structural view of a centrifugal wind wheel according to a first embodiment of the present utility model applied to a centrifugal fan;

FIG. 5 is a schematic view of a centrifugal rotor according to a first embodiment of the utility model;

FIG. 6 is a schematic view of a centrifugal rotor according to another embodiment of the utility model;

FIG. 7 is a mathematical model of a rotor blade in a centrifugal rotor according to a first embodiment of the utility model during a design phase;

FIG. 8 is a schematic view of a blade in a centrifugal rotor according to a first embodiment of the utility model;

fig. 9 is a partial enlarged view of IX in fig. 8;

fig. 10 is a mathematical model of a cross-section of a blade in a centrifugal rotor according to a first embodiment of the utility model.

Reference numerals illustrate:

10-a centrifugal fan; 100-centrifuging a wind wheel; 110-a fixing ring; 120-wheel body; 121-a connecting ring; 122-hub; 130-a first wind deflector; 140-a second wind deflector; 150-blades; 151-leading edge; 152-trailing edge; 153-suction side; 1531-induced draft face section; 1532-extension segment; 154—pressure face; 155-drainage grooves; 160-an air outlet; 200-driving a motor; 300-volute.

Detailed Description

Referring to fig. 1 to 3 (arrows in fig. 3 indicate air flow directions), in the prior art, a centrifugal wind wheel is generally in a straight cylindrical shape, that is, the diameter of the centrifugal wind wheel is kept consistent in the axial direction, wherein, blades in the centrifugal wind wheel are bent, the cross sections of the blades are arc-shaped, the length direction of the blades is the axial direction of the centrifugal wind wheel, and the width direction of the blades is the chord length direction of the arc shape of the cross sections of the blades. Specifically, the width of the blades is kept uniform in the length direction thereof, i.e., the width of the blades does not change in the axial direction of the centrifugal wind wheel.

The inventor researches that in the process of rotating the centrifugal wind wheel to discharge air, air enters the centrifugal wind wheel along the axial direction of the centrifugal wind wheel and is blown out along the radial direction of the centrifugal wind wheel under the action of centrifugal force, in the process, the front half and the rear half of the blades (the air firstly flows through the front half of the blades and then flows through the rear half of the blades) do different amounts of work on the air, the work on the air by the rear half of the blades is far greater than the work on the air by the front half of the blades, and the width of the front half and the rear half of the blades are consistent, and the air introduced from the front half of the blades cannot be blown out outwards under the diversion effect of the rear half of the blades due to the fact that the width of the front half and the rear half of the blades are limited, so that the condition of small air discharge amount is caused. In this regard, the application provides a centrifugal wind wheel, the cross section of the blade is in an airfoil shape, the chord length of the airfoil shape of the blade is gradually increased in the direction from the fixed ring to the wheel body, namely the width of the blade is gradually increased in the length direction, so that the average width of the rear half section of the blade is larger than that of the front half section of the blade, and the air introduced from the front half section of the blade can be blown outwards under the diversion effect of the rear half section of the blade, thereby increasing the air output.

In addition, in the prior art, when air flows through the surface of the blade of the centrifugal wind wheel, vortex shedding can be generated in the latter half part of the suction surface of the blade due to the action of low-energy fluid and reverse pressure gradient of the boundary layer, so that turbulent noise is caused, the flowing condition of downstream airflow is also deteriorated, and the loss of air quantity is caused. In this way, the application provides a centrifugal wind wheel, the suction surface of the blade is provided with the drainage groove, the drainage groove can absorb low-energy fluid in the surface layer so as to inhibit surface layer separation and improve the turning angle of air flow, thereby avoiding the condition that air falls off in the rear half part of the suction surface of the blade, reducing wind noise, ensuring the stable flow of downstream air flow and avoiding air quantity loss.

In addition, in the prior art, the centrifugal wind wheel is rotatably arranged in the volute, the driving motor is connected with the centrifugal wind wheel, and the centrifugal wind wheel, the volute and the driving motor jointly form a centrifugal fan, wherein a large gap is reserved between two ends (the front end and the rear end of the centrifugal wind wheel and air flows into the centrifugal wind wheel from the front end) of the centrifugal wind wheel along the axial direction of the centrifugal wind wheel and the volute. When air enters the centrifugal wind wheel along the axial direction of the centrifugal wind wheel, the air cannot be immediately converted into radial flow from the axial direction when the air just enters the centrifugal wind wheel, and a large gap is formed between the front end of the centrifugal wind wheel and the volute, so that the air can form a low-speed vortex at the front end of the centrifugal wind wheel after flowing out of the centrifugal wind wheel, and the air escapes from the gap between the front end of the centrifugal wind wheel and the volute and returns into the centrifugal wind wheel, thereby causing air quantity loss; because a larger gap is formed between the rear end of the centrifugal wind wheel and the volute, air can sequentially flow through the gap between the rear end of the centrifugal wind wheel and the volute and the hub hole (formed on the hub of the centrifugal wind wheel) after flowing out of the centrifugal wind wheel, and returns into the centrifugal wind wheel, so that the air quantity loss is further caused. In this regard, the application provides a centrifugal wind wheel, wherein wind shields are respectively arranged at two ends of the centrifugal wind wheel in an extending way, so that gaps between the two ends of the centrifugal wind wheel and a volute are reduced, the condition that air flows back to the centrifugal wind wheel from the two ends of the centrifugal wind wheel is avoided, and the air output is ensured.

In order that the above objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.

First embodiment

Referring to fig. 4 to 6 (arrows in fig. 4 indicate air flow directions), an embodiment of the present utility model provides a centrifugal wind wheel 100 for achieving wind performance. It can increase the air-out volume, improves air-out efficiency, strengthens the air-out effect, promotes user experience.

It should be noted that, the centrifugal wind wheel 100 is applied to the centrifugal fan 10, and the centrifugal fan 10 includes a driving motor 200, a volute 300, and the centrifugal wind wheel 100. The driving motor 200 is in transmission connection with the centrifugal wind wheel 100, the centrifugal wind wheel 100 is rotatably installed in the volute 300, and the driving motor 200 can drive the centrifugal wind wheel 100 to rotate relative to the volute 300 so as to enable the centrifugal wind wheel 100 to generate negative pressure and drive air to flow, so that air-out airflow is formed in the volute 300.

The centrifugal wind wheel 100 includes a stationary ring 110, a wheel body 120, a first wind deflector 130, a second wind deflector 140, and a plurality of blades 150. The fixed ring 110 and the wheel body 120 are coaxially and parallelly arranged at intervals, the plurality of blades 150 are arranged in an annular array, and are connected between the fixed ring 110 and the wheel body 120, and the fixed ring 110 and the wheel body 120 are used for coacting to fix the relative positions of the blades 150 and prevent the blades 150 from falling off. The driving motor 200 is connected with the wheel body 120, and the driving motor 200 can synchronously drive the blades 150 and the fixed ring 110 to rotate through the wheel body 120, and the blades 150 are used for guiding air so as to realize the air outlet function of the centrifugal wind wheel 100. Specifically, the fixed ring 110, the wheel body 120 and two adjacent blades 150 together enclose an air outlet 160, a plurality of air outlets 160 are formed between the plurality of blades 150, during the rotation of the centrifugal wind wheel 100, air passes through the fixed ring 110 along the axial direction of the centrifugal wind wheel 100 and enters between the plurality of blades 150, and then is blown out through the plurality of 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 the process, the blades 150 apply work to the air, so that the air changes the flow direction under the action of the centrifugal force, and the air flowing into the centrifugal wind wheel 100 along the axial direction of the centrifugal wind wheel 100 is blown out along the radial direction of the centrifugal wind wheel 100.

Further, the cross section of the blade 150 is in an airfoil shape, the chord length of the airfoil shape formed by the blade 150 is gradually increased in the direction from the fixed ring 110 to the wheel body 120, that is, the cross section area of the airfoil shape formed by the blade 150 is gradually increased in the direction from the fixed ring 110 to the wheel body 120, so that the width of the blade 150 is gradually increased in the length direction, the average width of the second half section of the blade 150 is larger than that of the first half section of the blade 150, the air introduced from the first half section of the blade 150 is ensured to be blown outwards under the flow guiding effect of the second half section of the blade 150, the air output is increased, the air output efficiency is improved, the air output effect is enhanced, and the user experience is improved.

It should be noted that, the first wind shielding ring 130 is connected to the fixed ring 110 and extends in a direction away from the wheel body 120, that is, the first wind shielding ring 130 is disposed at the front end of the centrifugal wind wheel 100, and the first wind shielding ring 130 is used for reducing a gap between the front end of the centrifugal wind wheel 100 and the volute 300, so as to avoid occurrence of backflow of air at the front end of the centrifugal wind wheel 100; the second wind shielding ring 140 is connected with the wheel body 120 and extends towards a direction away from the fixed ring 110, that is, the second wind shielding ring 140 is arranged at the rear end of the centrifugal wind wheel 100, and the second wind shielding ring 140 is used for reducing a gap between the rear end of the centrifugal wind wheel 100 and the volute 300 so as to avoid the occurrence of backflow of air at the rear end of the centrifugal wind wheel 100; the first wind shielding ring 130 and the second wind shielding ring 140 cooperate to avoid the condition that air flows back to the centrifugal wind wheel 100 from the two ends of the centrifugal wind wheel 100, ensure the air output, improve the air output efficiency and enhance the air output effect.

In the present embodiment, the first wind deflector 130 is integrally formed with the fixing ring 110, and the second wind deflector 140 is integrally formed with the wheel body 120, so as to improve the connection strength.

Referring to fig. 7, it is noted 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 a direction from the trailing edge 152 to the leading edge 151, that is, the air flows from the leading edge 151 toward the trailing edge 152 relative to the blade 150 when the blade 150 rotates. Further, the leading edge 151 and the trailing edge 152 are both arranged in a B-spline curve, the airfoil of the blade 150 is formed by stacking the leading edge 151 and the trailing edge 152 as stacking lines, and the shape of the whole blade 150 can be more in accordance with aerodynamic requirements by the leading edge 151 and the trailing edge 152 arranged in the B-spline curve, so that the work of the blade 150 on air is improved, the air output is increased, and the air output efficiency is improved.

In this embodiment, the expression of the B-spline curve of the leading edge 151 is:(u)=/> ; in the/> (I=0, 1,2 …, n) is a control vertex of a polygon, and a broken line formed by sequentially connecting a plurality of control vertices is a B-spline control polygon; To correspond to control vertex/> B-spline basis functions of (2). Accordingly, the expression of the B-spline curve presented by the trailing edge 152 is: /(I)(u)=/>; In the/>(I=0, 1,2 …, n) is a control vertex of a polygon, and a broken line formed by sequentially connecting a plurality of control vertices is a B-spline control polygon; /(I)To correspond to control vertex/>B-spline basis functions of (2). The reasonable expression of the B-spline curve of the leading edge 151 and the B-spline curve of the trailing edge 152 can further improve the wind guiding effect of the blade 150 and increase the wind output.

Specifically, the expression of the B-spline basis function is:

；

Where k is the power of the B-spline, i is the sequence number, Is a node. The reasonable B-spline basis function can ensure the air output of the centrifugal wind wheel 100, enhance the air output effect and facilitate the production and processing of the blades 150.

Referring to fig. 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 the suction surface 153 and the pressure surface 154 are both used for sweeping the air flow, so as to achieve the air guiding function. The suction surface 153 and the pressure surface 154 are both arranged to protrude in the same direction, the suction surface 153 is arranged on the outer side of the pressure surface 154, the suction surface 153 and the pressure surface 154 are both arranged between the front edge 151 and the rear edge 152, and when the centrifugal wind wheel 100 rotates, air flows on the suction surface 153 and the pressure surface 154 at the same time, and the flowing direction is the direction from the front edge 151 to the rear edge 152. Specifically, the suction surface 153 is provided with the drainage groove 155, the drainage groove 155 extends along the length direction of the blade 150, the distance between the drainage groove 155 and the front edge 151 is larger than the distance between the drainage groove 155 and the tail edge 152, namely, the drainage groove 155 is arranged on the second half path of the air flowing on the suction surface 153, so that the condition that the air falls off due to vortex on the second half path can be avoided, the air output is ensured, and the wind noise is reduced.

In this embodiment, the suction surface 153 is provided with the drainage groove 155, and the drainage groove 155 is used to absorb the low-energy fluid in the surface layer to inhibit the separation of the surface layer and improve the turning angle of the airflow, so as to prevent vortex shedding, reduce wind noise, ensure that the downstream airflow stably flows, avoid air loss, ensure air output and improve air output efficiency. However, the present invention is not limited thereto, and in other embodiments, slits or holes may be formed in the suction surface 153, and the low-energy fluid in the attachment surface layer may be sucked and removed to ensure the air output.

Suction side 153 includes a leading side segment 1531 and an extension side segment 1532. The leading edge 151 is connected to the trailing edge 152 via a leading face segment 1531 and an extension face segment 1532 in sequence, i.e., the leading face segment 1531 is connected to the leading edge 151 and the extension face segment 1532 is connected to the trailing edge 152. Specifically, the cross section of the induced air surface section 1531 is curved, and the induced air surface section 1531 with the curved cross section can stably guide the air, so that the air is attached to the induced air surface section 1531 to flow outwards; the cross section of the extending surface section 1532 is linear, and the extending surface section 1532 with the linear cross section can compress the air flowing out along the induced air surface section 1531 and throw the air out along the radial direction of the centrifugal wind wheel 100, so as to ensure the air outlet efficiency; the induced flow groove 155 is formed in the induced air surface section 1531 and is located on the path of the second half section of the air flowing on the induced air surface section 1531, so as to avoid vortex shedding of the air, ensure air output and reduce wind noise.

Further, the ratio of the opening width of the drainage groove 155 to the cross-sectional curve length of the induced air surface section 1531 ranges from 0.06 to 0.08, and the reasonable ratio of the opening width of the drainage groove 155 to the cross-sectional curve length of the induced air surface section 1531 can improve the drainage effect of the drainage groove 155, ensure that the drainage groove 155 can absorb low-energy fluid in the surface layer, and thereby avoid vortex shedding.

In the present embodiment, the ratio of the opening width of the drainage groove 155 to the cross-sectional curve length of the induced air surface section 1531 is 0.07, but not limited thereto, and in other embodiments, the ratio of the opening width of the drainage groove 155 to the cross-sectional curve length of the induced air surface section 1531 may be 0.06 or 0.08, and the ratio of the opening width of the drainage groove 155 to the cross-sectional curve length of the induced air surface section 1531 is not particularly limited.

Further, on the cross section of the induced air surface section 1531, a preset curve is formed between the front edge 151 and a sidewall of the induced groove 155 near the front edge 151, the ratio of the length of the preset curve to the length of the cross section curve of the induced air surface section 1531 ranges from 0.6 to 0.7, and the reasonable ratio of the length of the preset curve to the length of the cross section curve of the induced air surface section 1531 can ensure that the induced groove 155 is located at a reasonable position on the path of the second half of the induced air surface section 1531, so that vortex shedding is avoided.

In the present embodiment, the ratio of the length of the preset curve to the length of the cross-section curve of the induced-draft surface segment 1531 is 0.65, but not limited thereto, and in other embodiments, the ratio of the length of the preset curve to the length of the cross-section curve of the induced-draft surface segment 1531 may be 0.6 or 0.7, and the ratio of the length of the preset curve to the length of the cross-section curve of the induced-draft surface segment 1531 is not particularly limited.

For ease of understanding, the opening width of the induced groove 155 is denoted as a, the length of the cross-sectional curve of the induced face segment 1531 is denoted as b, and the length of the preset curve is denoted as c.

With continued reference to fig. 6, the wheel 120 includes a connecting ring 121 and a hub 122. The hub 122 is connected to the inner side of the connection ring 121 and extends in a direction approaching the fixing ring 110, that is, the hub 122 is disposed between the plurality of blades 150, the hub 122 is connected to the driving motor 200, and the driving motor 200 can drive the connection ring 121 to rotate through the hub 122, thereby driving the blades 150 and the fixing ring 110 to rotate. One end of each blade 150 is connected to the connecting ring 121 and is flush with the outer edge of the connecting ring 121, and the other end of each blade 150 is connected to the inner side of the fixing ring 110, so that the stability of the whole centrifugal wind wheel 100 structure is improved, and the air outlet effect is ensured. Specifically, the outer diameter of the connection 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 shape of the blade 150 gradually increases in the direction from the fixing ring 110 to the connection ring 121, i.e. the width of one end of the blade 150 near the fixing ring 110 is smaller, and the width of one end of the blade 150 near the connection ring 121 is larger), so that the blade 150 can be stably connected between the fixing ring 110 and the connection ring 121, the connection strength is improved, and the loosening or falling-off condition of the blade 150 is prevented.

According to the centrifugal wind wheel 100 of the embodiment of the utility model, the fixed ring 110 and the wheel body 120 are coaxially and alternately arranged, the plurality of blades 150 are annularly arranged in an array and are connected between the fixed ring 110 and the wheel body 120, the cross sections of the blades 150 are in an airfoil shape, and the chord length of the airfoil shape of the blades 150 is gradually increased in the direction from the fixed ring 110 to the wheel body 120. Compared with the prior art, the centrifugal wind wheel 100 provided by the utility model has the advantages that the blades 150 which are arranged in the wing shape and the chord length of the wing shape is gradually increased in the direction from the fixed ring 110 to the wheel body 120 are adopted, so that the air output can be increased, the air output efficiency is improved, the air output effect is enhanced, and the user experience is improved.

Second embodiment

The present utility model provides an air conditioner (not shown) for controlling indoor air temperature. The air conditioner includes a centrifugal fan 10 and an air conditioner body (not shown), and the centrifugal fan 10 includes a driving motor 200, a scroll case 300, and a centrifugal wind wheel 100. The basic structure and principle of the centrifugal wind wheel 100 and the technical effects thereof are the same as those of the first embodiment, and for brevity, reference is made to the corresponding contents of the first embodiment where the description of the embodiment is not mentioned.

In this embodiment, the air conditioner is a fresh air fan, a dehumidifier or a mobile air conditioner, and the centrifugal fan 10 is installed in the air conditioner body, and the centrifugal fan 10 is used for generating negative pressure to drive air to flow, thereby forming an air outlet airflow, and further realizing a fresh air function, a dehumidification function or a temperature regulation function. Specifically, the centrifugal wind wheel 100 is rotatably installed in the volute 300, the driving motor 200 is installed on the volute 300 and penetrates through the volute 300, the driving motor 200 is connected with the centrifugal wind wheel 100, and the driving motor 200 can drive the centrifugal wind wheel 100 to rotate relative to the volute 300 so as to enable the centrifugal wind wheel 100 to generate negative pressure and drive air to flow, so that an air outlet flow is formed in the volute 300.

The beneficial effects of the air conditioner according to the embodiment of the present utility model are the same as those of the first embodiment, and will not be described in detail herein.

Although the present utility model is disclosed above, the present utility model is not limited thereto. Various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the utility model, and the scope of the utility model should be assessed accordingly to that of the appended claims.

Claims (11)

1. The utility model provides a centrifugal wind wheel, its characterized in that, including solid fixed ring (110), wheel body (120) and a plurality of blade (150), solid fixed ring (110) with wheel body (120) coaxial and interval set up, a plurality of blade (150) are the annular array setting, and all connect in gu fixed ring (110) with between wheel body (120), the transversal wing section of blade (150) personally submits the wing section setting, the chord length of wing section that blade (150) is in follow gu fixed ring (110) extremely in the direction of wheel body (120) increases gradually.

2. The centrifugal wind wheel according to claim 1, wherein the blades (150) are 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 each provided with a B-spline curve, and the airfoil of the blades (150) is formed by stacking the leading edge (151) and the trailing edge (152) as an stacking line.

3. Centrifugal wind wheel according to claim 2, wherein the leading edge (151) has a curved expression:(u)=/> ; in the/> (I=0, 1,2 …, n) is the control vertex of a polygon,/>To correspond to control vertexB spline basis functions of (2);

The trailing edge (152) exhibits a curved expression: (u)=/> ; in the/> (I=0, 1,2 …, n) is the control vertex of a polygon,/>To correspond to control vertex/>B-spline basis functions of (2).

4. A centrifugal wind wheel according to claim 3, wherein the expression of the B-spline basis function is:

；

Where k is the power of the B-spline, i is the sequence number, Is a node.

5. The centrifugal wind wheel according to claim 2, wherein 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 protruding in the same direction, the suction surface (153) is arranged on the outer side 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) extends along the length direction of the blade (150), and the distance between the drainage groove (155) and the leading edge (151) is larger than the distance between the drainage groove (155) and the trailing edge (152).

6. The centrifugal wind wheel according to claim 5, wherein the suction surface (153) comprises an induced air surface section (1531) and an extension surface section (1532), the leading edge (151) is connected with the trailing edge (152) sequentially through the induced air surface section (1531) and the extension surface section (1532), the cross section of the induced air surface section (1531) is curved, the cross section of the extension surface section (1532) is linear, and the induced groove (155) is opened on the induced air surface section (1531).

7. The centrifugal wind wheel according to claim 6, wherein the ratio of the opening width of the induced flow groove (155) to the cross-sectional curve length of the induced flow surface section (1531) ranges from 0.06 to 0.08.

8. The centrifugal wind wheel according to claim 6, wherein, in the cross section of the induced air surface section (1531), a predetermined curve is formed between the leading edge (151) and a side wall of the induced groove (155) close to the leading edge (151), and the ratio of the length of the predetermined curve to the length of the cross section curve of the induced air surface section (1531) is in the range of 0.6 to 0.7.

9. The centrifugal wind wheel according to claim 1, wherein 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 extends towards 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 side 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 larger than the inner diameter of the fixing ring (110).

10. The centrifugal wind wheel according to claim 1, further comprising a first wind deflector (130) and a second wind deflector (140), wherein the first wind deflector (130) is connected to the stationary ring (110) and extends away from the wheel body (120), and the second wind deflector (140) is connected to the wheel body (120) and extends away from the stationary ring (110).

11. An air conditioner, characterized by comprising 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 installed in the volute (300), and the driving motor (200) is connected with the wheel body (120).