Centrifugal fan, centrifugal fan device and air conditioner

Abstract

The invention relates to a centrifugal fan, a centrifugal fan device and an air conditioner, the centrifugal fan comprises a volute and an impeller, the volute comprises a fan cavity and an air outlet channel, the fan cavity is used for installing the impeller, the air outlet channel is communicated with the fan cavity, a first air channel and a second air channel are arranged in the air outlet channel in parallel in the first direction, and the first air channel and the second air channel are communicated with each other. A first air outlet corresponding to the first air channel is located in front of the impeller, and a second air outlet corresponding to the second air channel is located on one side of the impeller in the first direction. According to the centrifugal fan disclosed by the invention, the air outlet of the second air duct is arranged to be located on one side of the impeller in the first direction, so that the airflow flowing out of the air outlet of the second air duct flows towards one side of the impeller in the first direction so as to flow to an airflow dead zone (namely an eddy current zone) on one side of the centrifugal fan in the first direction; therefore, the vortex of the centrifugal fan on the side in the first direction is reduced, the vortex noise of the centrifugal fan is reduced, and the noise of the centrifugal fan is reduced.

Description

Technical Field

[0001] This disclosure relates to the field of centrifugal fan technology, specifically to a centrifugal fan, a centrifugal fan device, and an air conditioner. Background Technology

[0002] In air handling equipment (such as air conditioners), the internal centrifugal fan is the main source of noise. Therefore, reducing the noise of the centrifugal fan is a pressing technical problem that needs to be solved to reduce noise in air handling equipment.

[0003] Centrifugal fan noise primarily consists of rotational noise and vortex noise. Currently, methods to reduce vortex noise are commonly used to lower the overall noise level of centrifugal fans. One approach involves installing a guide component at the front of the fan's outlet, directing a portion of the airflow downwards towards the fan to reduce vortices below and thus lower vortex noise. However, these methods only eliminate a small portion of the vortex noise, leaving the centrifugal fan noise level still relatively high. Summary of the Invention

[0004] This disclosure proposes a centrifugal fan to reduce the noise of the centrifugal fan.

[0005] The centrifugal fan disclosed herein includes a volute and an impeller. The volute includes a fan chamber for mounting the impeller and an air outlet channel communicating with the fan chamber. The air outlet channel is provided with a first air duct and a second air duct arranged side by side along a first direction. The first air outlet corresponding to the first air duct is located in front of the impeller, and the second air outlet corresponding to the second air duct is located on one side of the impeller in the first direction. The first direction is perpendicular to the front-back direction.

[0006] Optionally, the ratio of the size of the second air inlet corresponding to the second air duct in the first direction to the size of the first air inlet corresponding to the first air duct in the first direction is 1 / 5 to 3 / 10.

[0007] Optionally, the size of the second air inlet in the first direction is greater than the minimum distance between the sidewall of the volute and the impeller in the first direction.

[0008] Optionally, the air outlet channel is provided with a diverter plate, which extends along a second direction to two opposite inner wall surfaces of the volute to divide the air outlet channel in the volute into a first air duct and a second air duct, wherein the second direction is perpendicular to the first direction and the front-back direction.

[0009] Optionally, the diverter plate includes a first arc segment, the surface of which is a convex arc surface, wherein the convex arc surface is convex in a direction away from the second air outlet.

[0010] Optionally, the diverter plate further includes a first planar segment, which is disposed on the side of the first arc segment near the second air outlet, and the angle between the first planar segment and the plane perpendicular to the first direction is less than or equal to 40°.

[0011] Optionally, the diverter plate further includes a second planar segment, which is disposed on the side of the first arc-shaped segment away from the second air outlet, and the angle between the second planar segment and the plane perpendicular to the front-back direction is less than or equal to 50°.

[0012] Optionally, a guide plate is also provided in the second air duct, the guide plate extends along the second direction to the two opposing inner wall surfaces of the volute, and the end of the guide plate near the second air outlet is located in the plane of the second air outlet.

[0013] Optionally, the guide plate includes a second arc segment, the surface of which is a convex arc surface, and the convex arc surface is convex in a direction away from the second air outlet.

[0014] Optionally, the distance between the end of the diverter plate facing the impeller and the impeller is greater than the distance between the end of the guide plate facing the impeller and the impeller.

[0015] Optionally, the distance between the end of the diverter plate facing the impeller and the impeller is greater than 12 mm.

[0016] Optionally, the distance between the end of the diverter plate facing the impeller and the impeller is greater than 12 mm.

[0017] Optionally, in the plane where the second air outlet is located, the ratio of the distance between the guide plate and the side wall of the volute to the distance between the diverter plate and the side wall of the volute is 1 / 3 to 1 / 2.

[0018] The centrifugal fan device disclosed herein includes at least two centrifugal fans as described in any of the preceding claims.

[0019] Optionally, at least two of the centrifugal fans are arranged side by side along the first direction, and the second air outlets of two adjacent centrifugal fans are close to each other.

[0020] The air conditioner disclosed herein includes the centrifugal fan and / or the centrifugal fan assembly described in any of the preceding claims.

[0021] When the centrifugal fan of this disclosure is in operation, the airflow enters the fan cavity under the drive of the impeller and flows into the air outlet channel. After being rectified by the air outlet channel, it flows out through the first air duct and the second air duct arranged in parallel along the first direction. By setting the first air outlet corresponding to the first air duct to be located in front of the impeller, the airflow flowing out of the first air duct flows directly to the front side of the impeller, thereby ensuring the air outlet efficiency and air volume of the centrifugal fan. By setting the second air outlet corresponding to the second air duct to be located on one side of the impeller in the first direction, the airflow flowing out of the second air duct flows towards one side of the impeller along the first direction, so as to flow towards the airflow dead zone (i.e., the vortex region) on one side of the centrifugal fan in the first direction, thereby reducing the vortex on that side of the centrifugal fan in the first direction, reducing the vortex noise of the centrifugal fan, and reducing the noise of the centrifugal fan. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the internal structure of a centrifugal fan according to an embodiment of the present disclosure.

[0023] Figure 2 This is a cross-sectional view of a centrifugal fan according to an embodiment of the present disclosure.

[0024] Figure 3 yes Figure 2 A magnified view of a portion of the image.

[0025] Figure 4 This is a schematic diagram of the centrifugal fan in use according to an embodiment of the present disclosure.

[0026] Figure 5 This is a structural diagram of a centrifugal fan in use in related technologies.

[0027] Figure 6 This is a partial structural schematic diagram of an air conditioner according to an embodiment of the present disclosure.

[0028] Figure 7 This is a schematic diagram of the internal structure of an air conditioner according to an embodiment of the present disclosure.

[0029] Figure 8 yes Figure 7 A 3D view of a centrifugal fan.

[0030] Figure 9 yes Figure 7 Front view of a centrifugal fan.

[0031] Figure 10 This is a structural diagram of an air conditioner in use according to an embodiment of the present disclosure.

[0032] Figure 11 This is a structural diagram of an air conditioner in use in related technologies.

[0033] Figure label:

[0034] 10. Centrifugal fan; 1001. First fan; 1002. Second fan;

[0035] 1. Volute; 11. Fan cavity; 12. Air outlet duct; 122. First air duct; 1221. First air inlet; 1222. First air outlet; 1223. First main air duct; 1224. Second main air duct; 123. Second air duct; 1231. Second air inlet; 1232. Second air outlet; 1233. First side air duct; 1234. Second side air duct; 101. Side plate; 1011. Air outlet plate; 1012. Third end; 102. Volute plate;

[0036] 2. Impeller; 21. Impeller side;

[0037] 3. Diverter plate; 31. First planar segment; 311. First end; 32. First arc segment; 33. Second planar segment; 331. Fourth end; 34. First diverter plate; 35. Second diverter plate;

[0038] 4. Deflector plate; 41. Second arc segment; 42. Second end; 43. Fifth end; 44. First deflector plate; 45. Second deflector plate;

[0039] 5. Electric motor;

[0040] 20. Housing; 201. Air inlet cavity; 202. Air outlet cavity; 2001. Outer shell; 2002. Middle partition;

[0041] 30. Heat exchanger;

[0042] 200. Shell;

[0043] 300. Centrifugal fan. Detailed Implementation

[0044] Embodiments of this disclosure are described in detail below, with examples of these embodiments illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this disclosure, and should not be construed as limiting it.

[0045] like Figures 1 to 4 As shown, the centrifugal fan 10 of this embodiment includes a volute 1 and an impeller 2. The volute 1 includes a fan chamber 11 for mounting the impeller 2 and an air outlet duct 12 communicating with the fan chamber 11. The air outlet duct 12 contains a first air duct 122 and a second air duct 123 arranged side-by-side along a first direction. The first air outlet 1222 corresponding to the first air duct 122 is located in front of the impeller 2, and the second air outlet 1232 corresponding to the second air duct 123 is located on one side of the impeller 2 in the first direction. The first direction is perpendicular to the front-to-back direction.

[0046] The air outlet duct 12 is used to convert the velocity energy of the airflow into pressure energy, thereby increasing the airflow pressure. The air outlet duct 12 can be understood as: a channel formed by the diffuser of the centrifugal fan 10, or a channel formed by the diffuser section of the centrifugal fan 10.

[0047] Here, the first direction is perpendicular to the front-back direction, which can be understood as any direction perpendicular to the front-back direction. For example, the first direction can be the left-right direction or the up-down direction. The front-back direction, up-down direction, and left-right direction are as follows: Figures 1 to 5 As shown.

[0048] When the centrifugal fan 10 of this embodiment is working, the airflow enters the fan chamber 11 under the drive of the impeller 2 and flows into the air outlet duct 12. After being rectified by the air outlet duct 12, it flows out through the first air duct 122 and the second air duct 123 arranged in parallel along the first direction. By setting the first air outlet 1222 corresponding to the first air duct 122 to be located in front of the impeller 2, the airflow flowing out of the first air duct 122 flows directly to the front side of the impeller 2, thereby ensuring the air outlet efficiency and air volume of the centrifugal fan 10. By setting the second air outlet 1232 corresponding to the second air duct 123 to be located on one side of the impeller 2 in the first direction, the airflow flowing out of the second air duct 123 flows towards one side of the impeller 2 along the first direction, so as to flow towards the airflow dead zone (i.e., vortex region) on one side of the centrifugal fan 10 in the first direction, thereby effectively reducing the vortex on that side of the centrifugal fan 10 in the first direction, reducing the vortex noise of the centrifugal fan 10, and reducing the noise of the centrifugal fan 10. Figure 3 As shown, the air inlet of the first air duct 122 is the first air inlet 1221, and the air inlet of the second air duct 123 is the second air inlet 1231. To make the technical solution of this disclosure easier to understand, the technical solution of this disclosure will be further described below with the first direction being consistent with the left and right directions as an example.

[0049] For example, the first air outlet 1222 is located in front of the impeller 2, and the second air outlet 1232 is located to the right of the impeller 2. Figure 4 As shown, the airflow in the first air duct 122 flows forward within the first air duct 122 and continues to flow forward after exiting through the first air outlet 1222, thereby ensuring the air outlet efficiency and air volume of the centrifugal fan 10. The airflow in the second air duct 123 flows to the right front within the second air duct 123 and continues to flow to the right front after exiting through the second air outlet 1232 from the right side of the impeller 2, thereby reducing the vortex on the right side of the centrifugal fan 10.

[0050] like Figure 5As shown, in related technologies, devices with a centrifugal fan 300 (e.g., air conditioners) typically have the centrifugal fan 300 installed within a housing 200. In a first direction perpendicular to the front-back direction, a gap exists between the centrifugal fan 300 and the housing 200, creating a dead zone in the airflow and resulting in vortices between the centrifugal fan 300 and the housing 200. For example... Figure 4 As shown, a first air duct 122 and a second air duct 123 are arranged in parallel along a first direction in the air outlet duct 12. When the air outlet of the second air duct 123 is located on one side of the impeller 2 in the first direction, the airflow flowing out of the air outlet of the second air duct 123 flows toward one side of the impeller 2 in the first direction, thereby reducing the vortex on that side of the centrifugal fan 10 and reducing the vortex noise of the centrifugal fan 10.

[0051] It is understandable that even when the air outlet duct 12 is provided with a first air duct 122 and a second air duct 123 arranged in parallel along the first direction, it is still necessary to ensure that the airflow from the first air duct 122 and the second air duct 123 flows along the main designed air outlet direction as much as possible, so as to ensure the air outlet efficiency and air volume of the centrifugal fan 10.

[0052] Optionally, such as Figure 3 As shown, the ratio of the size of the air inlet of the second air duct 123 in the first direction to the size of the air inlet of the first air duct 122 in the first direction is 1 / 5 to 3 / 10.

[0053] For example, such as Figure 3 As shown, the first air inlet 1221 has a dimension of X in the first direction, and the second air inlet 1231 has a dimension of Y in the first direction, where Y is less than or equal to X.

[0054] By setting Y to be less than or equal to X, not only can the noise of the centrifugal fan 10 be reduced, but the air output efficiency and air volume of the centrifugal fan 10 can also be easily guaranteed.

[0055] Understandably, given a fixed size and airflow rate of the outlet duct 12, a smaller Y to X ratio results in a larger size of the first inlet 1221 in the first direction, causing more airflow from the outlet duct 12 to flow along the designed outlet direction, which is beneficial for ensuring the outlet efficiency and airflow volume of the centrifugal fan 10. However, a smaller size of the second inlet 1231 in the first direction results in less airflow from the outlet duct 12 flowing towards the impeller 2 in the first direction, which is detrimental to reducing the vortex noise of the centrifugal fan 10. Conversely, given a fixed size and airflow rate of the outlet duct 12, a larger Y to X ratio results in more airflow from the outlet duct 12 flowing towards the impeller 2 in the first direction, which is more beneficial for reducing the vortex noise of the centrifugal fan 10. However, less airflow from the outlet duct 12 flows along the designed outlet direction, which is less beneficial for ensuring the outlet efficiency and airflow volume of the centrifugal fan 10.

[0056] Optionally, the ratio of Y to X is 1 / 5 to 3 / 10. By setting the ratio of the size of the air inlet of the second air duct 123 in the first direction to the size of the air inlet of the first air duct 122 in the first direction to 1 / 5 to 3 / 10, the vortex noise of the centrifugal fan 10 can be effectively reduced, while the air outlet efficiency and air volume of the centrifugal fan 10 can also be effectively guaranteed.

[0057] Optionally, such as Figure 3 As shown, the size of the air inlet of the second air duct 123 in the first direction is larger than the minimum distance between the side wall of the volute 1 and the impeller 2 in the first direction.

[0058] For example, the volute 1 includes two side plates 101 arranged opposite each other in the left-right direction, and the impeller 2 includes two impeller side plates 21 arranged opposite each other in the left-right direction. On the same side in the left-right direction, the distance between the impeller side plate 21 and the side plate 101 is Z, which is equal to the minimum distance between the side wall of the volute 1 and the impeller 2 in the first direction.

[0059] By setting the size of the air inlet of the second air duct 123 in the first direction to be larger than the minimum distance between the side wall of the volute 1 and the impeller 2 in the first direction, i.e., Y is greater than Z, it can be ensured that a portion of the second air inlet 1231 corresponds to the impeller 2. This allows the airflow passing through the impeller 2 to enter the second air duct 123 through the air inlet, ensuring airflow within the second air duct 123. Furthermore, this ensures airflow out of the second air duct 123, reducing vortices in the centrifugal fan 10 and lowering its noise.

[0060] Optionally, such as Figure 1 and Figure 2 As shown, a diverter plate 3 is provided inside the air outlet duct 12. The diverter plate 3 extends along the second direction to two opposite inner wall surfaces of the volute 1 to divide the air outlet duct 12 into a first air duct 122 and a second air duct 123. The second direction is perpendicular to the first direction and the front-back direction. The second direction can be the height direction of the centrifugal fan 10, for example, the up-down direction shown in the figure.

[0061] The flow divider 3 and the cavity wall of the air outlet duct 12 can be welded together.

[0062] By setting a diverter plate 3 in the air outlet duct 12, the air outlet duct 12 can be easily divided into a first air duct 122 and a second air duct 123, which facilitates the processing and manufacturing of the centrifugal fan 10 and helps to reduce the cost of the centrifugal fan 10.

[0063] Optionally, such as Figure 3As shown, the diverter plate 3 includes a first arc-shaped segment 32. The surface of the first arc-shaped segment 32 is a convex arc surface, and the convex arc surface is convex in a direction away from the second air outlet 1232. The convex arc surface can be a cylindrical surface or a parabolic surface, etc.

[0064] For example, such as Figure 3 As shown, the first arc segment 32 is a convex arc surface that protrudes to the left.

[0065] By providing a first arc-shaped section 32 in the flow divider 3, and designing the first arc-shaped section 32 as a convex arc surface protruding away from the second air outlet 1232, the first arc-shaped section 32 can guide the airflow. As a result, after passing through the first arc-shaped section 32, the airflow direction is more biased towards the second air outlet 1232, causing more of the airflow from the second air duct 123 to flow towards the second air outlet 1232. This effectively reduces the vortex in the centrifugal fan 10 and lowers the noise level of the centrifugal fan 10.

[0066] Optionally, such as Figure 3 As shown, the diverter plate 3 includes a first planar segment 31, which is disposed on the side of the first arc segment 32 near the second air outlet 1232, and the angle between the first planar segment 31 and the plane perpendicular to the first direction is less than or equal to 40°.

[0067] For example, such as Figure 3 As shown, the first planar segment 31 is located on the left rear side of the first arc surface segment 32, and the angle between the first planar segment 31 and the plane perpendicular to the left and right direction is A, where A is less than or equal to 40°.

[0068] It is understandable that the initial flow direction of the airflow in the second air duct 123 is consistent with the air outlet direction of the first air duct 122. However, the guiding direction of the first planar section 31 is inconsistent with the air outlet direction of the first air duct 122, which will change the flow direction of the airflow in the second air duct 123, thus limiting the guiding direction of the diverter plate 3.

[0069] The larger the angle between the first planar segment 31 and the plane perpendicular to the first direction, the greater the change in the flow direction of the airflow within the second air duct 123 caused by the first planar segment 31, which can easily lead to unstable airflow. By setting the angle between the first planar segment 31 and the plane perpendicular to the first direction to less than or equal to 40°, abrupt changes in the flow path within the second air duct 123 can be avoided, thereby improving the flow stability of the airflow within the second air duct 123.

[0070] Optionally, such as Figure 3 As shown, the diverter plate 3 also includes a second planar segment 33, which is located on the side of the first arc segment 32 away from the second air outlet 1232. The angle between the second planar segment 33 and the plane perpendicular to the front-back direction is less than or equal to 50°.

[0071] For example, such as Figure 3 As shown, the second plane segment 33 is located on the right front side of the first arc surface segment 32, and the angle between the second plane segment 33 and the plane perpendicular to the front-back direction is B, where B is less than or equal to 50°.

[0072] Understandably, the second plane segment 33 also alters the airflow direction within the second air duct 123. The larger the angle between the second plane segment 33 and the plane perpendicular to the front-back direction (less than or equal to 50°), the greater the change in airflow direction caused by the second plane segment 33 within the second air duct 123, potentially leading to unstable airflow. By setting the angle between the second plane segment 33 and the plane perpendicular to the front-back direction to less than or equal to 50°, abrupt changes in airflow within the second air duct 123 can be avoided, thus improving the stability of airflow within the second air duct 123.

[0073] It can have only one of the first plane segment and the second plane segment, or it can have both the first plane segment and the second plane segment.

[0074] Optionally, such as Figure 2 and Figure 3 As shown, the second air outlet 1232 is defined between the end of the diverter plate 3 facing the second air outlet 1232 and the side wall of the volute 1.

[0075] For example, such as Figure 3 As shown, the right end of the diverter plate 3 and the front end of the side plate 101 on the right side of the volute 1 define a second air outlet 1232.

[0076] By defining the second air outlet 1232 between the end of the diverter plate 3 facing the second air outlet 1232 and the side wall of the volute 1, the structure of the centrifugal fan 10 can be simplified and the cost of the centrifugal fan 10 can be reduced.

[0077] Optionally, a guide plate 4 is provided inside the second air duct 123, and the guide plate 4 extends along the second direction to two opposing inner wall surfaces of the volute 1. The end of the guide plate 4 near the second air outlet 1232 is located in the plane of the second air outlet 1232.

[0078] For example, the deflector 4 extends in the vertical direction.

[0079] By setting a guide plate 4 in the second air duct 123, the airflow in the second air duct 123 can be guided, so that more of the airflow out of the second air duct 123 flows in the direction of the second air outlet 1232, effectively reducing the vortex of the centrifugal fan 10 and reducing the noise of the centrifugal fan 10.

[0080] Optionally, such as Figure 3As shown, the guide plate 4 includes a second arc-shaped section 41. The surface of the second arc-shaped section 41 is a convex arc surface, and the convex arc surface is convex in a direction away from the second air outlet 1232. The convex arc surface can be a cylindrical surface or a parabolic surface.

[0081] For example, such as Figure 3 As shown, the second arc segment 41 is a convex arc surface that protrudes to the left.

[0082] By providing a second arc-shaped section 41 in the guide plate 4, and setting the second arc-shaped section 41 as a convex arc surface that protrudes in a direction away from the second air outlet 1232, the airflow from the second air duct 123 flows more in the direction of the second air outlet 1232. This effectively reduces the vortex in the centrifugal fan 10 and lowers the noise of the centrifugal fan 10.

[0083] Optionally, the distance between the end of the splitter plate 3 facing the impeller 2 and the impeller 2 is greater than the distance between the end of the guide plate 4 facing the impeller 2 and the impeller 2.

[0084] For example, the flow divider 3 has a first end 311 facing the impeller 2, and the distance between the first end 311 and the impeller 2 is D1. The flow guide plate 4 has a second end 42 facing the impeller 2, and the distance between the second end 42 and the impeller 2 is D2. D1 is greater than D2.

[0085] It is understandable that the guide plate 4 mainly serves to guide the airflow in the second air duct 123 and does not serve to split the flow. Therefore, the distance between the end of the guide plate 4 facing the impeller 2 and the impeller 2 is smaller than the distance between the end of the split plate 3 facing the impeller 2 and the impeller 2.

[0086] By setting the distance between the end of the guide plate 4 facing the impeller 2 and the impeller 2 to be smaller than the distance between the end of the splitter plate 3 facing the impeller 2 and the impeller 2, the amount of material in the guide plate 4 can be reduced, thus lowering the cost of the centrifugal fan 10. Furthermore, since the guide plate 4 is positioned closer to the side wall of the volute 1 than the splitter plate 3, setting the distance between the end of the splitter plate 3 facing the impeller 2 and the impeller 2 to be greater than the distance between the end of the guide plate 4 facing the impeller 2 and the impeller 2 ensures that airflow can enter the space enclosed between the guide plate 4 and the side plate 101, effectively reducing vortices in the centrifugal fan 10 and lowering its noise.

[0087] Optionally, the distance between the end of the splitter plate 3 facing the impeller 2 and the impeller 2 is greater than a preset value, which should ensure that the splitter plate 3 and the impeller 2 are kept at a safe distance.

[0088] Preferably, the preset value is 12mm, that is, the distance between the end of the diverter plate 3 facing the impeller 2 and the impeller 2 is greater than 12mm.

[0089] It is understandable that if the gap between the flow divider 3 and the impeller 2 is too small, when the centrifugal fan 10 is working, the flow divider 3 and the impeller 2 may collide due to vibration or other reasons, affecting the normal operation of the impeller 2, or even causing damage to the impeller 2.

[0090] By setting the distance between the end of the splitter plate 3 facing the impeller 2 and the impeller 2 to be greater than a preset value, the distance between the splitter plate 3 and the impeller 2 can be kept within a safe distance range, avoiding collision between the splitter plate 3 and the impeller 2 when the centrifugal fan 10 is working, thus improving the reliability of the centrifugal fan 10. In some other embodiments, the centrifugal fan 10 may also be provided with a first air duct 122 and two second air ducts 123, and the second air outlets 1232 of the two second air ducts 123 are respectively located on both sides of the impeller 2 in the first direction.

[0091] Optionally, such as Figure 3 and Figure 4 As shown, the end of the guide plate 4 facing the second air outlet 1232 is located in the plane where the second air outlet 1232 is located. In the plane where the second air outlet 1232 is located, the ratio of the distance between the guide plate 4 and the side wall of the volute 1 to the distance between the splitter plate 3 and the side wall of the volute 1 is 1 / 3 to 1 / 2.

[0092] For example, such as Figure 3 As shown, the side panel 101 on the right is an air outlet 1011, which has a third end 1012. The diverter plate 3 has a fourth end 331, and the third end 1012 and the fourth end 331 form a second air outlet 1232. The guide plate 4 has a fifth end 43, which faces the second air outlet 1232. The fourth end 331 is located in front of the third end 1012, and the fifth end 43 is located in front of the fourth end 331. The distance between the fifth end 43 and the third end 1012 is L1, and the distance between the fourth end 331 and the third end 1012 is L2. The ratio between L1 and L2 is 1 / 3 to 1 / 2.

[0093] By setting one end of the guide plate 4 facing the second air outlet 1232 to be located in the plane of the second air outlet 1232, the guide plate 4 can better guide the airflow in the second air duct 123. By setting the ratio of the distance between the guide plate 4 and the side wall of the volute 1 to the distance between the split plate 3 and the side wall of the volute 1 in the plane of the second air outlet 1232 to 1 / 3 to 1 / 2, the guiding effect of the guide plate 4 can be effectively improved, the eddy current of the centrifugal fan 10 can be effectively reduced, and the noise of the centrifugal fan 10 can be reduced.

[0094] like Figures 6 to 10 As shown, the centrifugal fan device of this disclosure includes at least two centrifugal fans 10 as described in any of the above embodiments.

[0095] For example, such as Figures 6 to 10 As shown, the centrifugal fan device includes a housing 20 and two centrifugal fans 10, both of which are installed inside the housing 20.

[0096] For example, the housing 20 defines an air inlet chamber 201 and an air outlet chamber 202. The fan chamber 11 is disposed within and communicates with the air inlet chamber 201, and the air outlet channel 12 is disposed within and communicates with the air outlet chamber 202. Airflow enters the centrifugal fan 10 through the air inlet chamber 201, and then flows out through the air outlet channel 12 and the air outlet chamber 202.

[0097] Since the centrifugal fan 10 of the present disclosure embodiment can reduce eddy noise, the air conditioner of the present disclosure embodiment has the advantages of low noise.

[0098] Since the centrifugal fan 10 of the present disclosure embodiment can reduce noise, the centrifugal fan device of the present disclosure embodiment has the advantages of low noise.

[0099] Optionally, at least two centrifugal fans 10 are arranged side by side along a first direction. The second air outlets 1232 of two adjacent centrifugal fans 10 are close to each other.

[0100] For example, such as Figures 6 to 10 As shown, there are two centrifugal fans 10, namely a first fan 1001 and a second fan 1002. The first fan 1001 is located to the left of the second fan 1002. Both the first fan 1001 and the second fan 1002 are provided with a flow divider 3 and a flow guide 4 in their air outlet ducts 12. The flow divider 3 and the flow guide 4 in the first fan 1001 are respectively the first flow divider 34 and the first flow guide 44. The flow divider 3 and the flow guide 4 in the second fan 1002 are respectively the second flow divider 35 and the second flow guide 45.

[0101] The air outlet duct 12 of the first fan 1001 is divided into a first air duct 122 and a second air duct 123 by a first diverter plate 34, and the first air duct 122 and the second air duct 123 of the first fan 1001 are respectively the first main air duct 1223 and the first side air duct 1233. The air outlet duct 12 of the second fan 1002 is divided into a first air duct 122 and a second air duct 123 by a second diverter plate 35, and the first air duct 122 and the second air duct 123 of the second fan 1002 are respectively the second main air duct 1224 and the second side air duct 1234. The first main air duct 1223 is located to the left of the first side air duct 1233, and the air outlet of the first side air duct 1233 faces to the right; the second main air duct 1224 is located to the right of the second side air duct 1234, and the air outlet of the second side air duct 1234 faces to the left.

[0102] like Figure 10As shown, when the centrifugal fan device is running, airflow enters the first fan 1001 and the second fan 1002 respectively. Then, a portion of the airflow from the first fan 1001 flows out through the first main air duct 1223, and another portion of the airflow from the first fan 1001 flows out to the right through the first side air duct 1233 to reduce the vortex on the right side of the first fan 1001. A portion of the airflow from the second fan 1002 flows out through the second main air duct 1224, and another portion of the airflow from the second fan 1002 flows out to the left through the second side air duct 1234 to reduce the vortex on the right side of the second fan 1002 and reduce the noise of the centrifugal fan device.

[0103] In addition, the second air outlets 1232 of the first fan 1001 and the second fan 1002 are close to each other, which can make the air outlets of the first fan 1001 and the second fan 1002 cooperate to reduce the eddy currents between the first fan 1001 and the second fan 1002 and reduce the noise of the centrifugal fan device.

[0104] like Figure 4 , Figures 7 to 10 As shown, the air conditioner of this disclosure includes the centrifugal fan 10 and / or centrifugal fan device described in any of the above embodiments.

[0105] like Figure 11 As shown, the air conditioner in the related technology includes a housing 200 and multiple centrifugal fans 300, which are arranged sequentially along the axial direction of the volute. Large vortices are generated between adjacent centrifugal fans 300, resulting in high noise levels in the air conditioner. To reduce the vortices between adjacent centrifugal fans 300, some manufacturers have reduced the distance between them, thereby reducing the airflow dead zone and the vortices. However, this can lead to airflow competition between the two centrifugal fans 300, affecting the air intake volume of the air conditioner.

[0106] like Figure 10 As shown, the air conditioner uses a centrifugal fan device according to an embodiment of this disclosure. A portion of the airflow from the first centrifugal fan 10 flows out through the second air duct 123 toward the side closer to the second centrifugal fan 10 to reduce the vortex of the first centrifugal fan 10; a portion of the airflow from the second centrifugal fan 10 flows out through the second air duct 123 toward the side closer to the first centrifugal fan 10 to reduce the vortex of the second centrifugal fan 10 and reduce the noise of the air conditioner.

[0107] like Figure 6 , Figure 9 and Figure 10 As shown, a heat exchanger 30 is provided inside the air outlet cavity 202, and the airflow blown out by the first fan 1001 and the second fan 1002 is directed toward the heat exchanger 30.

[0108] like Figures 6 to 10As shown, the first fan 1001 and the second fan 1002 are arranged coaxially, and the impeller 2 of the first fan 1001 and the impeller 2 of the second fan 1002 are both driven by the same motor 5.

[0109] like Figure 7 As shown, the housing 20 includes an outer shell 2001 and a middle partition 2002, which divides the space inside the outer shell 2001 into an air inlet chamber 201 and an air outlet chamber 202.

[0110] The air conditioner of this embodiment, by providing a diverter 3 within the air outlet duct 12 of the centrifugal fan 10, forms at least two air ducts within the air outlet duct 12, including a first air duct 122 and a second air duct 123. The air outlet of the second air duct 123 is located on one side of the impeller 2 in a first direction. This ensures that most of the airflow passes through the first air duct 122 and is normally blown towards the heat exchanger 30, while a small portion passes through the second air duct 123 and is blown towards the airflow dead zone of the centrifugal fan 10, reducing the eddies generated in this area and lowering the noise of the air conditioner. Furthermore, by providing a guide plate 4 within the second air duct 123, the airflow dispersion caused by an excessively large air outlet of the second air duct 123, preventing airflow from failing to reach the airflow dead zone, can be effectively avoided. Additionally, the height of the centrifugal fan 10 can be maintained without altering its dimensions, ensuring that the overall air intake of the unit remains unaffected and preventing "air competition" between multiple centrifugal fans 10.

[0111] In the description of this disclosure, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this disclosure and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this disclosure.

[0112] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this disclosure, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0113] In this disclosure, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0114] In this disclosure, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0115] In this disclosure, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0116] Although embodiments of the present disclosure have been shown and described above, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present disclosure. Any changes, modifications, substitutions and variations made to the above embodiments by those skilled in the art are within the scope of protection of the present disclosure.

Claims

1. A centrifugal fan, characterized in that, The device includes a volute and an impeller. The volute includes a fan chamber for mounting the impeller and an air outlet channel communicating with the fan chamber. The air outlet channel has a first air duct and a second air duct arranged side by side along a first direction. The first air outlet corresponding to the first air duct is located in front of the impeller, and the second air outlet corresponding to the second air duct is located on one side of the impeller in the first direction. The first direction is perpendicular to the front-back direction.

2. The centrifugal fan according to claim 1, characterized in that, The ratio of the size of the second air inlet corresponding to the second air duct in the first direction to the size of the first air inlet corresponding to the first air duct in the first direction is 1 / 5 to 3 / 10.

3. The centrifugal fan according to claim 2, characterized in that, The second air inlet has a dimension in the first direction that is larger than the minimum distance between the side wall of the volute and the impeller in the first direction.

4. The centrifugal fan according to claim 1, characterized in that, The air outlet channel is provided with a diverter plate, which extends along the second direction to two opposite inner wall surfaces of the volute to divide the air outlet channel in the volute into a first air duct and a second air duct, wherein the second direction is perpendicular to the first direction and the front-back direction.

5. The centrifugal fan according to claim 4, characterized in that, The diverter plate includes a first arc segment, the surface of which is a convex arc surface, wherein the convex arc surface is convex in a direction away from the second air outlet.

6. The centrifugal fan according to claim 5, characterized in that, The diverter plate further includes a first planar segment, which is disposed on the side of the first arc segment near the second air outlet, and the angle between the first planar segment and the plane perpendicular to the first direction is less than or equal to 40°.

7. The centrifugal fan according to claim 5, characterized in that, The diverter plate further includes a second planar segment, which is disposed on the side of the first arc-shaped segment away from the second air outlet, and the angle between the second planar segment and the plane perpendicular to the front-back direction is less than or equal to 50°.

8. The centrifugal fan according to claim 4, characterized in that, The second air duct is also provided with a guide plate, which extends along the second direction to the two opposing inner wall surfaces of the volute, and the end of the guide plate near the second air outlet is located in the plane of the second air outlet.

9. The centrifugal fan according to claim 8, characterized in that, The air guide plate includes a second arc segment, the surface of which is a convex arc surface, and the convex arc surface is convex in a direction away from the second air outlet.

10. The centrifugal fan according to claim 8, characterized in that, The distance between the end of the diverter plate facing the impeller and the impeller is greater than the distance between the end of the guide plate facing the impeller and the impeller.

11. The centrifugal fan according to claim 10, characterized in that, The distance between the end of the flow divider facing the impeller and the impeller is greater than 12mm.

12. The centrifugal fan according to claim 8, characterized in that, In the plane containing the second air outlet, the ratio of the distance between the guide plate and the side wall of the volute to the distance between the split plate and the side wall of the volute is 1 / 3 to 1 / 2.

13. A centrifugal fan device, characterized in that, It includes at least two centrifugal fans as described in any one of claims 1-12.

14. The centrifugal fan device according to claim 13, characterized in that, At least two of the centrifugal fans are arranged side by side along the first direction, and the second air outlets of two adjacent centrifugal fans are close to each other.

15. An air conditioner, characterized in that, Includes the centrifugal fan according to any one of claims 1-12 and / or the centrifugal fan device according to claim 13 or 14.

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