Centrifugal fans and air conditioners

Abstract

The present invention provides a centrifugal fan and an air conditioner, wherein the centrifugal fan includes a wind wheel, and the wind wheel includes a wheel disc, a plurality of blades and air guide ribs. The middle part of the wheel disc protrudes to form a hub. A plurality of blades are arranged at the edge of the wheel disc, and the plurality of blades are arranged at intervals along the circumference of the hub. The air guide ribs extend from the outer peripheral wall of the hub toward the edge of the wheel disc, and in the direction in which the air guide ribs extend, there is an interval between the air guide ribs and the blades. When the centrifugal fan is working, the air guide ribs drive the airflow between the hub and the blades to rotate, and the air guide ribs make the airflow between the hub and the blades more uniform, and the airflow between the hub and the blades is filled more full and uniform. This effectively improves the flow state of the airflow, reduces the turbulent state of the airflow, and avoids the backflow of the airflow and the vortex of the airflow at the local position of the blade. This can significantly reduce the eddy noise and backflow noise, achieving the function of noise reduction of the centrifuge.

Description

Technical Field

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

[0002] Traditional centrifugal fans can change the flow direction of the fluid medium from the axial direction to the circumferential direction. Traditional centrifugal fans have many advantages. Therefore, under normal circumstances, the fresh air system of existing household air conditioners adopts traditional centrifugal fans. Under the premise of meeting the performance requirements of the fresh air system of the air conditioner, the noise of traditional centrifugal fans is relatively serious. Noise can cause a lot of trouble to people and affect people's work and life. Therefore, the high noise of traditional centrifugal fans is even more unacceptable. At present, in order to create a good living and working environment for people, the requirements for noise of household electrical appliances are becoming more and more stringent. Summary of the invention

[0003] An object of the present invention is to provide a centrifugal fan and an air conditioner for solving the above-mentioned technical problems.

[0004] In particular, the present invention provides a centrifugal fan, which includes a wind wheel, and the wind wheel includes:

[0005] The wheel disc, the middle part of which bulges out to form a hub;

[0006] A plurality of blades are arranged at the edge of the wheel disc and spaced apart along the circumference of the wheel hub;

[0007] The wind guide ribs extend from the outer peripheral wall of the hub toward the edge of the wheel disc, and there is a gap between the wind guide ribs and the blades in the direction in which the wind guide ribs extend.

[0008] Optionally, the length of the air guide rib along its extending direction is 0.17 times to 0.21 times the diameter of the wheel disc.

[0009] Optionally, the dimension of the wind guide rib along the protruding direction of the hub is 0.5 to 0.7 times the dimension of the blade along the protruding direction of the hub.

[0010] Optionally, the angle between a line from the center of the wheel disc to the intersection point of the air guide rib and the hub and the air guide rib at the intersection point is in a range of 30° to 36°.

[0011] Optionally, the bending center of the blade and the bending center of the wind guiding rib adjacent thereto are on the same side.

[0012] Optionally, the curvature radius of the air guide rib is greater than or equal to 31 mm.

[0013] Optionally, the curvature radius of the blade is smaller than the curvature radius of the wind guide rib.

[0014] Optionally, the number of the air guide ribs ranges from 10 to 16, and the plurality of air guide ribs are evenly spaced along the circumferential direction of the outer peripheral wall of the hub.

[0015] Optionally, the centrifugal fan further comprises:

[0016] The shell has a cavity for accommodating the wind wheel, and has an air inlet and an air outlet on both sides of a diameter of the wheel disc.

[0017] According to a second aspect of the present invention, the present invention further provides an air conditioner, comprising the centrifugal fan as described above.

[0018] The present invention provides a centrifugal fan and an air conditioner, wherein the centrifugal fan includes a wind wheel, and the wind wheel includes a wheel disc, a plurality of blades and air guide ribs. The middle part of the wheel disc protrudes to form a hub. A plurality of blades are arranged at the edge of the wheel disc, and the plurality of blades are arranged at intervals along the circumference of the wheel hub. The air guide ribs extend from the outer peripheral wall of the wheel hub toward the edge of the wheel disc, and in the direction in which the air guide ribs extend, there is a gap between the air guide ribs and the blades. When the centrifugal fan is working, the air guide ribs drive the airflow between the wheel hub and the blades to rotate, and the air guide ribs make the airflow between the wheel hub and the blades more uniform, and the airflow between the wheel hub and the blades is filled more fully. This effectively improves the flow state of the airflow, reduces the turbulent state of the airflow, and avoids the backflow of the airflow and the vortex of the airflow at the local position of the blade. This can significantly reduce the vortex noise and the backflow noise, and achieve the function of reducing the noise of the centrifuge.

[0019] Based on the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings, those skilled in the art will become more aware of the above and other objects, advantages and features of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the accompanying drawings:

[0021] Figure 1 is a schematic diagram of a wind wheel according to an embodiment of the present invention from one viewing angle;

[0022] Figure 2 is a schematic diagram of a wind wheel according to an embodiment of the present invention from one viewing angle;

[0023] Figure 3 is an exploded view of a centrifugal fan according to an embodiment of the present invention;

[0024] Figure 4 is a schematic diagram of a centrifugal fan according to an embodiment of the present invention from one perspective;

[0025] Figure 5 is a schematic diagram of a centrifugal fan according to an embodiment of the present invention from one perspective;

[0026] Figure 6 It is a schematic diagram of a traditional centrifugal fan from one perspective;

[0027] Figure 7 It is a schematic diagram of a traditional centrifugal fan from one perspective;

[0028] Figure 8 This is a simulation diagram of the velocity vector of the fluid in a traditional centrifugal fan;

[0029] Fig. 9 is a simulation diagram of a fluid velocity vector of a centrifugal fan according to an embodiment of the present invention;

[0030] Fig.10 This is the sound power cloud diagram of a traditional centrifugal fan;

[0031] Fig.11 1 is a sound power cloud diagram of a centrifugal fan according to an embodiment of the present invention. DETAILED DESCRIPTION

[0032] Figure 1 is a schematic diagram of a wind wheel according to an embodiment of the present invention from one viewing angle; Figure 2 is a schematic diagram of a wind wheel according to an embodiment of the present invention from one viewing angle; Figure 3 is an exploded view of a centrifugal fan according to an embodiment of the present invention; Figure 4 is a schematic diagram of a centrifugal fan according to an embodiment of the present invention from one perspective; Figure 5 is a schematic diagram of a centrifugal fan according to an embodiment of the present invention from one perspective; Figure 6 It is a schematic diagram of a traditional centrifugal fan from one perspective; Figure 7 It is a schematic diagram of a traditional centrifugal fan from one perspective; Figure 8 It is a simulation diagram of the velocity vector of the fluid in a traditional centrifugal fan; Fig. 9 is a simulation diagram of a fluid velocity vector in a centrifugal fan according to an embodiment of the present invention; Fig.10 This is the sound power cloud diagram of a traditional centrifugal fan; Fig.11 1 is a sound power cloud diagram of a centrifugal fan according to an embodiment of the present invention.

[0033] Under the premise of meeting the performance requirements of the fresh air system of the air conditioner, the noise of the traditional centrifugal fan is relatively serious. Noise will cause a lot of trouble to people and affect their work and life. In order to create a good living and working environment for people, the requirements for noise of household electrical appliances are becoming increasingly stringent. According to the analysis of the inventor, the main reasons for the prominent noise of the traditional centrifugal fan include two aspects, which are specifically described as follows:

[0034] The first aspect: the airflow will be deflected towards the blades only after it contacts the hub. Figure 7 and Figure 8 As shown in the figure, the hub in the traditional centrifugal fan is a smooth curved surface, which will cause uneven transition between the hub flow field and the blade flow field. In other words, this causes the flow field between the hub and the blade to be partially uneven, which leads to fluid turbulence. In other words, this will cause eddy currents and backflows of the fluid medium, which will increase the broadband noise of the traditional centrifugal fan, thereby causing the overall noise of the traditional centrifugal fan to rise.

[0035] The second aspect: when the airflow reaches the blade from the hub, the airflow direction is different from the tangent direction of the blade's airfoil, which will also increase the noise of traditional centrifugal fans.

[0036] In this embodiment, if Figures 3 to 5 As shown, the centrifugal fan 10 of this embodiment mainly includes a housing 200 and a wind wheel 100. The housing 200 has a cavity, an air inlet 220 and an air outlet 210, and the wind wheel 100 is contained in the cavity of the housing 200. The air inlet 220 and the air outlet 210 are respectively opened on both sides of a diameter of the wind wheel 100, or it can be understood that the air inlet 220 and the air outlet 210 are respectively opened on opposite sides of the housing 200. Figures 3 to 5 As shown, based on the orientation in the figure, if the air outlet 210 is opened at the top of the housing 200, the air inlet 220 is opened at the bottom of the housing 200. Obviously, the positions of the air inlet 220 and the air outlet 210 of the housing 200 are only exemplary and not exclusive.

[0037] As a specific example, Figure 1 to Figure 2 As shown, the centrifugal fan 10 provided in this embodiment includes a wind wheel 100, and the wind wheel 100 includes a wheel disc 110, a plurality of blades 120 and an air guide rib 130. The middle part of the wheel disc 110 protrudes to form a hub 111. The plurality of blades 120 are arranged at the edge of the wheel disc 110, and the plurality of blades 120 are arranged at intervals along the circumference of the hub 111. The air guide rib 130 extends from the outer peripheral wall of the hub 111 toward the edge of the wheel disc 110, and in the direction in which the air guide rib 130 extends, there is an interval 150 between the air guide rib 130 and the blade 120.

[0038] The main shape of the wheel disc 110 can be selected as needed. In this embodiment, Figure 1 and Figure 2 As shown, the middle part of the wheel disc 110 protrudes to form a hub 111, so the wheel disc 110 is a three-dimensional structure, but the main body shape of the wheel disc 110 is circular, or it can be understood that the shape of the hub after being projected onto the wheel disc is circular.

[0039] The middle of the wheel disc 110 protrudes to form a hub 111. The middle of the wheel disc 110 is a broad concept. The middle of the wheel disc 110 is relative to the edge of the wheel disc 110. The middle of the wheel disc 110 is not necessarily the center of the wheel disc 110. Figure 1 and Figure 2 As shown, the middle of the wheel disc 110 refers to the center position of the wheel disc 110, and the center position of the wheel disc 110 protrudes to form a cylindrical hub 111. Obviously, this is only exemplary and not exclusive.

[0040] The hub 111 is used to rotate under the drive of the driving device, and the hub 111 drives the blades 120 on the wheel disc 110 and the wind guide ribs 130 on the hub 111 to rotate to achieve air supply. The specific type of the driving device is not limited. For example, the driving device mainly includes a motor, and the output shaft of the motor is fixedly connected to the hub 111 to drive the hub 111 to rotate.

[0041] A plurality of blades 120 are arranged at the edge of the wheel disc 110, and the plurality of blades 120 are arranged at intervals along the circumference of the hub 111. The number of blades 120 is not limited and can be selected as needed. In the present embodiment, the edge of the wheel disc 110 is a broad concept, and the edge of the wheel disc 110 is an area relative to the middle of the wheel disc 110, and the edge of the wheel disc 110 is not only the end of the wheel disc 110 or the edge close to the end of the wheel disc 110. In the present embodiment, the edge of the wheel disc 110 refers to the area close to the end of the wheel disc 110, or it can be understood that one end of the blade 120 is flush with the wheel disc 110, and the other end of the blade 120 is facing the middle of the wheel disc.

[0042] The spacing distance of the plurality of blades 120 along the hub 111 can be selected as required. In the present embodiment, the plurality of blades 120 are evenly spaced. The plurality of blades 120 are arranged along the circumference of the hub 111, that is, the plurality of blades 120 are arranged around the hub 111, or it can be understood that the plurality of blades 120 are arranged around the hub 111. In the present embodiment, the main body shape of the wheel disc 110 is circular, and the plurality of blades 120 are also evenly spaced along the edge of the wheel disc 110. The arrangement of the plurality of blades 120 on the wheel disc 110 can be selected as required. In the present embodiment, a circular impeller 140 is arranged on the wheel disc 110, and the impeller 140 is coaxially arranged with the hub 111, and the impeller 140 is punched to form the plurality of blades 120.

[0043] The air guide rib 130 extends from the outer peripheral wall of the hub 111 toward the edge of the wheel disc 110, and in the direction in which the air guide rib 130 extends, there is a gap 150 between the air guide rib 130 and the blade 120. The material and shape of the air guide rib 130 can be selected as required. In this embodiment, the air guide rib 130 is arc-shaped, that is, the air guide rib 130 is not flat, and the air guide rib 130 has a certain curvature.

[0044] The location and manner of the air guide ribs 130 on the hub 111 can be selected as needed. In this embodiment, the air guide ribs 130 do not extend in the radial direction of the hub 111, and the air guide ribs 130 are inclined relative to the radial direction of the hub 111. In this embodiment, there are multiple air guide ribs 130, and the multiple air guide ribs 130 are evenly spaced along the circumference of the hub 111.

[0045] The air guide rib 130 extends toward the edge of the wheel disc 110, that is, the air guide rib 130 extends toward the direction of the blade 120, and the air guide rib 130 extends toward the outside of the wheel hub 111. In the direction in which the air guide rib 130 extends, there is a gap 150 between the air guide rib 130 and the blade 120, that is, there is a gap 150 between the end of the air guide rib 130 away from the wheel hub 111 and the end of the blade 120 away from the edge of the wheel disc 110. Alternatively, it can be understood that the end of the air guide rib 130 away from the wheel hub 111 does not contact the end of the blade 120 away from the edge of the wheel disc 110, and there is no structural interference between the end of the air guide rib 130 away from the wheel hub 111 and the end of the blade 120 away from the edge of the wheel disc 110.

[0046] When the centrifugal fan 10 is working, the hub 111 drives the air guide ribs 130, the blades 120 and the wheel 110 to rotate, and the air guide ribs 130 drive the airflow between the hub 111 and the blades 120 to rotate in advance, and the air guide ribs 130 make the airflow between the hub 111 and the blades 120 more uniform, and the air guide ribs 130 make the airflow fully filled between the hub 111 and the blades 120. This effectively improves the flow state of the airflow, reduces the turbulent state of the airflow, and avoids the backflow of the airflow and the vortex of the airflow at the local position of the blade 120. This can significantly reduce the vortex noise and backflow noise, and achieve the function of reducing the noise of the centrifuge.

[0047] like Figure 8 and Fig. 9 As shown, Figure 8 It is based on the simulation diagram of the traditional centrifugal fan. Figure 8 The simulation diagram in FIG. 1 mainly shows the velocity vector diagram of the airflow of a traditional centrifugal fan. Fig. 9 is a simulation diagram of a centrifugal fan 10 provided according to an embodiment of the present invention, Fig. 9 The simulation diagram in the figure mainly shows the velocity vector diagram of the airflow of a traditional centrifugal fan. In the simulation diagram, the airflow in the blue area is a low-speed airflow, the airflow in the cyan area is a medium-low-speed airflow, and the airflow in the red and yellow area is a medium-high-speed airflow. Figure 8 It can be clearly seen that the hub 111 in the conventional centrifugal fan does not have the air guide ribs 130, and the airflow velocity distribution between the hub 111 and the blades 120 in the conventional centrifugal fan is uneven and the airflow is not full. Fig. 9It can be clearly seen that in a centrifugal fan 10 provided by an embodiment of the present invention, the hub 111 in the centrifugal fan 10 is provided with air guide ribs 130, the air flow velocity distribution between the hub 111 and the blades 120 in the centrifugal fan 10 is relatively uniform, and the air flow is also relatively full.

[0048] Fig.10 This is the sound power cloud diagram of a traditional centrifugal fan; Fig.11 : is a sound power cloud diagram of a centrifugal fan 10 according to an embodiment of the present invention. It can be seen from the figure that the maximum noise value of the centrifugal fan 10 according to an embodiment of the present invention is reduced from 46dB to 44.4dB, a decrease of 1.6dB, a decrease of 3.5%.

[0049] The above experimental data show that the air guide ribs 130 in the centrifugal fan 10 provided in this embodiment effectively improve the flow state of the airflow, reduce the turbulence of the airflow, and avoid the backflow of the airflow and the vortex of the airflow at the local position of the blade 120. This can significantly reduce the vortex noise and backflow noise, achieving the function of reducing the noise of the centrifuge.

[0050] It can be seen that when the centrifugal fan 10 is working, the air guide ribs 130 drive the airflow between the hub 111 and the blades 120 to rotate, and the air guide ribs 130 make the airflow between the hub 111 and the blades 120 more uniform, and the airflow between the hub 111 and the blades 120 is filled more fully and evenly. This effectively improves the flow state of the airflow, reduces the turbulent state of the airflow, and avoids the backflow of the airflow and the vortex of the airflow at the local position of the blade 120. This can significantly reduce the vortex noise and backflow noise, achieving the function of reducing the noise of the centrifuge.

[0051] In some other embodiments, the angle between the line 160 from the center of the wheel disc 110 to the intersection of the air guide rib 130 and the wheel hub 111 and the air guide rib 130 at the intersection is in the range of 30° to 36°. Figure 2As shown, in this embodiment, the main body shape of the wheel disc 110 is circular, or the figure formed by the orthographic projection of the hub 111 on the wheel disc 110 is circular. Since the middle part of the wheel disc 110 protrudes to form the hub 111, the wheel disc 110 is a three-dimensional structure, and the center of the wheel disc 110 is the axis of the hub 111. The intersection of the air guide rib 130 and the hub 111 also forms a line, referred to as the intersection line. The axis to the intersection line forms a surface, and the angle between the air guide rib 130 and the surface at the intersection line ranges from 30° to 36°. For the convenience of description, in this embodiment, the center of the wheel disc 110 is the center of the figure formed by the orthographic projection of the hub 111 on the wheel disc 110, and the intersection point of the air guide rib 130 and the hub 111 is the point where the intersection line of the air guide rib 130 and the hub 111 is projected on the wheel disc 110, referred to as the intersection point. The connecting line 160 of the intersection point and the center forms two angles with the wind guiding rib 130 at the intersection point, one acute angle and one obtuse angle, and the angle range of the acute angle is 30° to 36°.

[0052] like Figure 8 As shown, the velocity vector of the airflow between the hub 111 and the blades 120 in the conventional centrifugal fan is relatively chaotic, the velocity of the airflow is uneven, and the direction of the airflow is also relatively chaotic. Fig. 9 As shown, the velocity vector of the airflow between the hub 111 and the blade 120 in the centrifugal fan 10 provided in this embodiment is relatively regular. First, the velocity of the airflow is relatively uniform. Second, the direction of the airflow is also relatively regular. The direction of the airflow is toward the direction of the blade 120. The direction of the airflow is toward the direction of the blade 120 sending air outward. Alternatively, it can be understood that the flow direction of the airflow is close to the tangent direction of the airfoil of the blade 120.

[0053] It can be seen that when the inclination angle of the air guide rib 130 is in the range of 30° to 36°, the airflow is pre-rotated by the air guide rib 130, and the flow direction of the airflow is close to the tangent direction of the airfoil of the blade 120. That is, the direction and magnitude of the speed of the airflow are close to the direction and magnitude of the speed of the blade 120, which further reduces the noise of the centrifugal fan 10.

[0054] In some other embodiments, the bending center of the blade 120 and the bending center of the adjacent wind guide rib 130 are on the same side. As a specific example, the bending centers of the wind guide rib 130 close to the connecting line 160 and the blade 120 close to the connecting line 160 are both on the side of the connecting line 160. Figure 2 Taking the orientation in FIG. 1 as an example, the bending center of the top blade 120 and the bending center of the top wind guide rib 130 are both on the left side, that is, the bending center of the blade 120 and the bending center of the adjacent wind guide rib 130 are on the same side. Alternatively, it can be understood that the bending directions of the blade 120 and the wind guide rib 130 are consistent.

[0055] like Figure 8 As shown, the velocity vector of the airflow between the hub 111 and the blades 120 in the conventional centrifugal fan is relatively chaotic, the velocity of the airflow is uneven, and the direction of the airflow is also relatively chaotic. Fig. 9 As shown, the velocity vector of the airflow between the hub 111 and the blade 120 in the centrifugal fan 10 provided in this embodiment is relatively regular. First, the velocity of the airflow is relatively uniform, and second, the direction of the airflow is also relatively regular, and the direction of the airflow is toward the direction of the blade 120, and the flow direction of the airflow is close to the tangent direction of the airfoil of the blade 120.

[0056] It can be seen that the bending center of the blade 120 and the bending center of the adjacent wind guide rib 130 are on the same side, that is, the bending directions of the blade 120 and the adjacent wind guide rib 130 are consistent. The airflow is pre-rotated by the wind guide rib 130, and the flow direction of the airflow is close to the tangent direction of the airfoil of the blade 120, and the speed direction and magnitude of the airflow are close to the speed direction and magnitude of the blade 120, which further reduces the noise of the centrifugal fan 10.

[0057] In some other embodiments, the curvature radius of the air guide rib 130 is greater than or equal to 31 mm, and when the air guide rib 130 is at the limit, the shape of the air guide rib 130 is planar. When the curvature radius of the air guide rib 130 is greater than or equal to 31 mm, the air guide rib 130 has a better air guiding effect. In addition, such air guide rib 130 makes the flow direction of the airflow close to the tangent direction of the airfoil of the blade 120, and the speed direction and magnitude of the airflow are close to the speed direction and magnitude of the blade 120, which further reduces the noise of the centrifugal fan 10.

[0058] like Figure 8 As shown, the velocity vector of the airflow between the hub 111 and the blades 120 in the conventional centrifugal fan is relatively chaotic, the velocity of the airflow is uneven, and the direction of the airflow is also relatively chaotic. Fig. 9 As shown, the velocity vector of the airflow between the hub 111 and the blade 120 in the centrifugal fan 10 provided in this embodiment is relatively regular. First, the velocity of the airflow is relatively uniform, and secondly, the direction of the airflow is also relatively regular, and the direction of the airflow is toward the direction of the blade 120, and the direction of the airflow is toward the direction of the blade 120 sending air outward. Or it can be understood that the flow direction of the airflow is close to the tangent direction of the airfoil of the blade 120, and the velocity direction and magnitude of the airflow are close to the velocity direction and magnitude of the blade 120.

[0059] Therefore, when the curvature radius of the air guide rib 130 is greater than or equal to 31 mm, the air guide effect of the air guide rib 130 is better. In addition, the air guide rib 130 makes the flow direction of the airflow close to the tangent direction of the airfoil of the blade 120, and the speed direction and magnitude of the airflow are close to the speed direction and magnitude of the blade 120, which further reduces the noise of the centrifugal fan 10.

[0060] In some other embodiments, the radius of curvature of the blade 120 is smaller than the radius of curvature of the wind guide rib 130, that is, the curvature degree of the blade 120 is greater than the curvature degree of the wind guide rib 130. Such wind guide ribs 130 have a better wind guiding effect. Moreover, such wind guide ribs 130 make the flow direction of the airflow close to the tangent direction of the airfoil of the blade 120, and the speed direction and magnitude of the airflow are close to the speed direction and magnitude of the blade 120, which further reduces the noise of the centrifugal fan 10.

[0061] In some other embodiments, the length of the wind guide rib 130 along the extension direction is 0.17 to 0.21 times the diameter of the wheel disc 110. That is, the size of the wind guide rib 130 along the extension direction is 0.17 to 0.21 times the diameter of the wheel disc 110, and the wind guide rib 130 of this size has a better wind guiding effect.

[0062] In some other embodiments, the size of the wind guide rib 130 along the protruding direction of the hub 111 is 0.5 to 0.7 times the size of the blade 120 along the protruding direction of the hub 111. That is, along the protruding direction of the hub 111, the length of the wind guide rib 130 is 0.5 to 0.7 times the length of the hub 111, and the wind guide rib 130 of this size has a better wind guiding effect.

[0063] In some other embodiments, the number of the air guide ribs 130 ranges from 10 to 16, and the plurality of air guide ribs 130 are evenly spaced along the outer peripheral wall of the hub 111. Such a number of air guide ribs 130 makes the airflow between the hub 111 and the blades 120 more uniform.

[0064] In some other embodiments, the centrifugal fan 10 further includes a housing 200, the cavity of the housing 200 is used to accommodate the wind wheel 100, and an air inlet 220 and an air outlet 210 are provided on both sides of a diameter of the wheel disc 110. The air inlet 220 and the air outlet 210 are respectively provided on both sides of a diameter of the wind wheel 100, or it can be understood that the air inlet 220 and the air outlet 210 are respectively provided on opposite sides of the housing 200. Figures 3 to 5 As shown, if the air outlet 210 is opened at the top of the housing 200, the air inlet 220 is opened at the bottom of the housing 200. Obviously, the positions where the air inlet 220 and the air outlet 210 of the housing 200 are opened are only exemplary and not exclusive.

[0065] According to a second aspect of the present invention, the present invention further provides an air conditioner, the air conditioner comprising any one of the above centrifugal fans 10. Since the air conditioner comprises any one of the above centrifugal fans 10, the air conditioner has the advantages of any one of the above centrifugal fans 10, which will not be described one by one here.

[0066] The specific type of the air conditioner can be selected as needed. In this embodiment, the air conditioner is a fresh air air conditioner (not shown in the figure). In addition to an indoor unit with the same appearance and performance as in the prior art (not shown in the figure), the fresh air air conditioner also includes a centrifugal fan 10 of this embodiment.

[0067] The centrifugal fan 10 is arranged at the end of the casing of the indoor unit and is located inside the casing, and is integrated with the original air conditioner indoor unit. The centrifugal fan 10 will not be exposed outside the indoor unit, which not only maintains the beauty of the appearance, but also saves the space for installing the indoor unit. The air inlet 220 of the centrifugal fan 10 is used to connect the fresh air inlet pipe leading to the outside, and the air outlet 210 of the centrifugal fan 10 faces the top of the casing. That is, the air inlet 220 of the centrifugal fan 10 inhales fresh air from the outside, and the air outlet 210 of the centrifugal fan 10 discharges air toward the top of the casing. The centrifugal fan 10 continuously transports fresh air from the outside to the indoor room.

[0068] It can be seen that the fresh air air conditioner of this embodiment is newly equipped with a centrifugal fan 10 on the traditional air conditioner indoor unit. Therefore, during the air conditioning cooling or heating process, even if the windows are closed, the centrifugal fan 10 can introduce outdoor air into the room. The centrifugal fan 10 provides continuous and fresh air for the closed indoor space, thereby increasing the oxygen content of the indoor air and preventing air-conditioning disease.

[0069] In the description of this embodiment, it needs to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0070] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features, that is, include one or more of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. When a feature "includes or contains" one or some of the features it covers, unless otherwise specifically described, this indicates that other features are not excluded and may further include other features.

[0071] Unless otherwise clearly defined and limited, the terms "installed", "connected", "connected", "fixed", "coupled" and the like 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 mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. A person skilled in the art should be able to understand the specific meanings of the above terms in the present invention according to the specific circumstances.

[0072] In addition, in the description of this embodiment, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them. That is, in the description of this embodiment, the first feature being "above", "above", and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature being "below", "below", or "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0073] Unless otherwise defined, all terms (including technical terms and scientific terms) used in the description of this embodiment have the same meaning as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0074] In the description of the present embodiment, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0075] At this point, those skilled in the art should recognize that, although multiple exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications that conform to the principles of the present invention can still be directly determined or derived based on the content disclosed in the present invention without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention should be understood and recognized as covering all these other variations or modifications.

Claims

1. A centrifugal fan, comprising a wind wheel, wherein the wind wheel comprises: A wheel disc, the middle part of which protrudes to form a wheel hub; A plurality of blades are arranged at the edge of the wheel disc and spaced apart along the circumference of the hub; An air guide rib extends from the outer peripheral wall of the hub toward the edge of the wheel disc, and in the direction in which the air guide rib extends, there is a gap between the air guide rib and the blade; The angle between the line from the center of the wheel disc to the intersection of the air guide rib and the wheel hub and the air guide rib at the intersection is in the range of 30° to 36°; The bending center of the blade and the bending center of the wind guide rib adjacent thereto are on the same side.

2. The centrifugal fan according to claim 1, wherein: The length of the air guide rib along its extending direction is 0.17 times to 0.21 times the diameter of the wheel disc.

3. The centrifugal fan according to claim 1, wherein: The dimension of the wind guiding rib along the protruding direction of the hub is 0.5 to 0.7 times the dimension of the blade along the protruding direction of the hub.

4. The centrifugal fan according to claim 1, wherein: The curvature radius of the air guide rib is greater than or equal to 31 mm.

5. The centrifugal fan according to claim 1, wherein: The curvature radius of the blade is smaller than the curvature radius of the wind guiding rib.

6. The centrifugal fan according to claim 1, wherein: The number of the wind guide ribs ranges from 10 to 16, and the plurality of wind guide ribs are evenly spaced along the circumferential direction of the outer peripheral wall of the hub.

7. The centrifugal fan according to claim 1, further comprising: The shell has a cavity for accommodating the wind wheel, and is provided with an air inlet and an air outlet along two sides of a diameter of the wheel disc.

8. An air conditioner, wherein: The air conditioner comprises the centrifugal fan according to any one of claims 1 to 7.

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