Centrifugal fan volute, centrifugal fan and air conditioner

Abstract

The embodiment of the invention provides a centrifugal fan volute, a centrifugal fan and an air conditioner, the centrifugal fan volute comprises an annular wall and two side walls, the two side walls are arranged on the two opposite sides of the annular wall in the first direction respectively, and an air passing cavity with an air outlet is defined by the two side walls and the annular wall jointly; wherein at least one of the two side walls is a flow collecting wall, the flow collecting wall is provided with an air inlet communicated with the air passing cavity, the side, away from the air passing cavity, of the flow collecting wall is provided with a first outer surface and a second outer surface, and the first outer surface and the second outer surface are arranged in the circumferential direction of the air inlet; and a height difference is formed between the first outer surface and the second outer surface in the first direction. The centrifugal fan volute disclosed by the embodiment of the invention has a better noise reduction effect.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fan, in particular to a centrifugal fan volute, centrifugal fan and air conditioner. BACKGROUND

[0002] The centrifugal fan is a kind of machine that relies on input mechanical energy to improve gas pressure and discharge gas. The centrifugal fan generally comprises a volute with an air inlet and an air outlet, and a fan wheel arranged in the volute and rotating to make airflow enter the volute from the air inlet and flow out from the air outlet.

[0003] However, noise is prone to occur during the operation of the fan wheel, especially when the fan wheel is running at high speed, the noise is more obvious, thereby affecting the user experience. SUMMARY

[0004] Therefore, the embodiments of the present application aim to provide a centrifugal fan volute with good noise reduction effect, a centrifugal fan and an air conditioner.

[0005] To achieve the above-mentioned purpose, an embodiment of the present application provides a centrifugal fan volute, comprising:

[0006] a ring wall;

[0007] two side walls, the two side walls are respectively arranged on opposite sides of the ring wall along a first direction, and together with the ring wall define a wind passing cavity with an air outlet; wherein at least one of the two side walls is a flow collecting wall, the flow collecting wall is provided with an air inlet communicating with the wind passing cavity, a side of the flow collecting wall away from the wind passing cavity has a first outer surface and a second outer surface, the first outer surface and the second outer surface are arranged along the circumference of the air inlet, and the first outer surface and the second outer surface form a height difference in the first direction.

[0008] In an embodiment, the number of the first outer surface and the second outer surface is multiple, and the multiple first outer surfaces and the multiple second outer surfaces are alternately arranged around the circumference of the air inlet.

[0009] In an embodiment, part of the flow collecting wall protrudes outward along the first direction, and another part of the flow collecting wall is recessed inward along the first direction, so that the flow collecting wall forms a wave shape around the circumference of the air inlet, wherein the outer surface of the protruding part of the flow collecting wall is the first outer surface, and the outer surface of the recessed part of the flow collecting wall is the second outer surface.

[0010] In an embodiment, the first outer surface and the second outer surface satisfy:

[0011]

[0012] wherein the maximum value of H is a maximum value of a distance of the first outer surface from a reference plane along the first direction, the minimum value of H is a minimum value of a distance of the second outer surface from the reference plane along the first direction, the reference plane is a virtual plane located at an intersection of the ring wall and the collector wall and perpendicular to the first direction, M is the number of the first outer surfaces, T is a variable and 0°≤T≤360°, is a first phase angle adjustment parameter, and A is a first reference value, B is a first adjustment amplitude, and h is a wall thickness of the collector wall.

[0013] In one embodiment, 6≤A≤40, B=6, and 0.5≤h≤5.

[0014] In one embodiment, on a cross section of the collector wall along a radial direction of the air inlet, a profile line of the first outer surface comprises a first curve segment and a second curve segment located on a side of the first curve segment away from the air inlet, a profile line of the second outer surface comprises a third curve segment and a fourth curve segment located on a side of the third curve segment away from the air inlet, and the first curve segment, the second curve segment, the third curve segment and the fourth curve segment all protrude along the first direction towards an outside of the collector wall.

[0015] In one embodiment, a portion of the first outer surface corresponding to the first curve segment and a portion of the second outer surface corresponding to the third curve segment are smoothly connected, and a portion of the first outer surface corresponding to the second curve segment and a portion of the second outer surface corresponding to the fourth curve segment are smoothly connected.

[0016] In one embodiment, the profile line of the first outer surface further comprises a first straight line segment between the first curve segment and the second curve segment, the profile line of the second outer surface further comprises a second straight line segment between the third curve segment and the fourth curve segment, and a portion of the first outer surface corresponding to the first straight line segment and a portion of the second outer surface corresponding to the second straight line segment are smoothly connected.

[0017] In one embodiment, a highest point of protrusion of the first outer surface along the first direction is located at a portion of the first outer surface corresponding to the first straight line segment, and a lowest point of recess of the second outer surface along the first direction is located at a portion of the second outer surface corresponding to the second straight line segment.

[0018] In one embodiment, the first straight line segment and the second straight line segment are both parallel to the radial direction, and a width L of the first straight line segment and the second straight line segment along the radial direction satisfies:

[0019]

[0020] Where M is the number of the first outer surfaces, T is the independent variable and 0°≤T≤360°, Φ is the second phase angle adjustment parameter and 0°≤Φ≤360°, E is the second reference value, and F is the second adjustment range.

[0021] In one implementation, 3 < E ≤ 80, F = 3.

[0022] Another embodiment of this application provides a centrifugal fan, including a fan wheel with a fan wheel inlet and the centrifugal fan casing described above. The fan wheel is disposed in the air passage cavity, and the fan wheel inlet faces the air inlet.

[0023] In one embodiment, the distance S between the collector wall and the wind turbine along the first direction satisfies: 3mm≤S≤10mm.

[0024] In one embodiment, the diameter D1 of the air inlet satisfies: D2×0.9≤D1≤D2×1.1, where D2 is the diameter of the air inlet of the impeller.

[0025] Another embodiment of this application provides an air conditioner including the centrifugal fan described above.

[0026] This application provides a centrifugal fan casing, a centrifugal fan, and an air conditioner. The centrifugal fan casing includes an annular wall and two side walls, at least one of which is a collecting wall. The collecting wall is provided with an air inlet communicating with the air passage cavity. The side of the collecting wall away from the air passage cavity has a first outer surface and a second outer surface. The first outer surface and the second outer surface are arranged circumferentially along the air inlet, and the first outer surface and the second outer surface form a height difference in a first direction. During the process of the external airflow flowing along the outer surface of the collecting wall, the airflow flowing along the first outer surface and the airflow flowing along the second outer surface form a flow rate difference and a velocity difference under the guiding effect of the first outer surface and the second outer surface, respectively. Therefore, after the airflow flows into the impeller of the centrifugal fan from the air inlet, it is difficult to form vortices. Thus, the noise of the centrifugal fan can be effectively reduced, thereby enabling the centrifugal fan casing to have a better noise reduction effect. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of a centrifugal fan according to an embodiment of this application;

[0028] Figure 2 for Figure 1 The diagram shows a cross-sectional view of the centrifugal fan along the radial direction of the air inlet.

[0029] Figure 3 for Figure 2 A magnified view of a portion of point Q;

[0030] Figure 4 for Figure 2 A magnified view of a section at point P in the middle;

[0031] Figure 5 for Figure 1 The diagram shown is a structural schematic of the centrifugal fan casing from one perspective.

[0032] Figure 6 for Figure 1 The diagram shows the structure of the centrifugal fan casing from another perspective.

[0033] Explanation of reference numerals in the attached figures

[0034] 100, Centrifugal fan casing; 100a, Air passage cavity; 100b, Air outlet; 10, Annular wall; 20, Side wall; 20a, Air inlet; 21, First outer surface; 211, First curved segment; 212, Second curved segment; 213, First straight segment; 22, Second outer surface; 221, Third curved segment; 222, Fourth curved segment; 223, Second straight segment; Y, Reference plane; 200, Wind turbine; 200a, Wind turbine air inlet; 210, Wind turbine blades. Detailed Implementation

[0035] In the description of the embodiments in this application, it should be noted that the term "first direction" refers to the direction based on the attached... Figure 1 Appendix Figure 2 and attached Figure 5 The orientation or positional relationship shown is merely for the convenience of describing the embodiments of this application and simplifying the description, and is 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, and therefore should not be construed as a limitation on the embodiments of this application.

[0036] One embodiment of this application provides a centrifugal fan; please refer to [link / reference]. Figure 1 The centrifugal fan includes a fan wheel 200 with a fan inlet 200a and a centrifugal fan casing 100.

[0037] Please see Figure 1 and Figure 2 The centrifugal fan casing 100 of this application embodiment includes an annular wall 10 and two side walls 20. The two side walls 20 are respectively disposed on opposite sides of the annular wall 10 along a first direction, and together with the annular wall 10, define an air passage cavity 100a having an air outlet 100b. At least one of the two side walls 20 is a collecting wall, which is provided with an air inlet 20a communicating with the air passage cavity 100a. That is, only one of the two side walls 20 may have an air inlet 20a, while the other side wall 20 may not have an air inlet 20a, or it may be as follows. Figure 2Both sidewalls 20 shown are provided with air inlets 20a. For ease of description, the sidewall 20 with air inlets 20a is referred to as the flow collecting wall.

[0038] Please continue reading. Figure 2 The side of the collecting wall away from the air passage 100a has a first outer surface 21 and a second outer surface 22, both of which are part of the outer surface of the collecting wall on the side away from the air passage 100a. The first outer surface 21 and the second outer surface 22 are arranged circumferentially along the air inlet 20a, and the first outer surface 21 and the second outer surface 22 form a height difference in a first direction.

[0039] In other words, the first outer surface 21 is located on one side of the second outer surface 22 along the circumference of the air inlet 20a. The first outer surface 21 and the second outer surface 22 are not arranged sequentially along the radial direction of the air inlet 20a. At the same time, the first outer surface 21 and the second outer surface 22 are not on the same plane. The difference between the height of the first outer surface 21 along the first direction and the height of the second outer surface 22 along the first direction is greater than 0. This means that the outer surface of the collector wall on the side away from the air passage 100a is not flat, but has a certain undulation along the circumference of the air inlet 20a.

[0040] The number of first outer surfaces 21 and second outer surfaces 22 can be one or more. The first outer surface 21 can be a plane or a curved surface with non-zero curvature. Similarly, the second outer surface 22 can be a plane or a curved surface with non-zero curvature, as long as the first outer surface 21 and the second outer surface 22 can form a height difference.

[0041] Please see Figure 2 The impeller 200 is located inside the air passage 100a, and the impeller air inlet 200a faces the air inlet 20a.

[0042] Specifically, please refer to Figure 2 The wind turbine 200 includes multiple wind turbine blades 210, which are spaced apart around the rotation axis of the wind turbine 200. The wind turbine inlet 200a is located at the end of the multiple wind turbine blades 210 along the extension direction of the rotation axis, and the wind turbine outlet is formed between two adjacent wind turbine blades 210.

[0043] Please see Figure 2 ,because Figure 2 The centrifugal fan casing 100 shown has two side walls 20 that are both collecting walls. Therefore, the impeller 200 is also provided with an impeller inlet 200a that corresponds to the collecting wall. Each impeller inlet 200a faces the inlet 20a of the corresponding collecting wall.

[0044] The impeller 200 rotates to create a negative pressure inside the centrifugal fan casing 100, causing the external airflow to flow along the outer surface of the collector wall. The airflow then flows from the air inlet 20a on the collector wall to the impeller air inlet 200a, and then passes through the impeller air inlet 200a, the impeller air outlet, and the air passage 100a in sequence, finally flowing out from the air outlet 100b.

[0045] In related technologies, the outer surface of the collector wall away from the air passage is generally flat. When the external airflow flows along the flat surface of the collector wall, the airflow generally flows at approximately the same velocity and flow rate. Therefore, when the airflow flows into the wind turbine from the air inlet and the wind turbine inlet, vortices are easily formed between two adjacent wind turbine blades. This is especially true when the wind turbine is running at high speed, and some of the noise generated during the operation of the wind turbine is caused by these vortices.

[0046] In this embodiment of the centrifugal fan casing 100, a first outer surface 21 and a second outer surface 22 are provided on the side of the collecting wall away from the air passage 100a. The first outer surface 21 and the second outer surface 22 are arranged circumferentially along the air inlet 20a, and the first outer surface 21 and the second outer surface 22 form a height difference in the first direction. During the process of the external airflow flowing along the outer surface of the collecting wall, the airflow flowing along the first outer surface 21 and the airflow flowing along the second outer surface 22 form a flow rate difference and a velocity difference under the guiding effect of the first outer surface 21 and the second outer surface 22, respectively (that is, the flow rate and velocity of the airflow flowing along the first outer surface 21 are different from those of the airflow flowing along the second outer surface 22). Therefore, after the airflow flows into the impeller 200 from the air inlet 20a and the impeller air inlet 200a, it is difficult to form vortices. As a result, the noise of the centrifugal fan can be effectively reduced, and the centrifugal fan casing 100 can have a good noise reduction effect.

[0047] In one embodiment, please refer to Figure 2 , Figure 5 and Figure 6 For a centrifugal fan casing 100 having multiple first outer surfaces 21 and multiple second outer surfaces 22, the multiple first outer surfaces 21 and multiple second outer surfaces 22 can be alternately arranged around the periphery of the air inlet 20a. That is, the multiple first outer surfaces 21 and multiple second outer surfaces 22 surround the periphery of the air inlet 20a, and along the circumference of the air inlet 20a, a second outer surface 22 is respectively arranged between two adjacent first outer surfaces 21.

[0048] This configuration allows the outer surface of the collecting wall to form a ring-shaped undulation around the air inlet 20a, creating flow rate and velocity differences between multiple airflows, thereby better reducing the formation of eddies.

[0049] In one embodiment, please refer toFigure 5 and Figure 6 A portion of the collector wall can protrude outwards along the first direction, while another portion can be recessed inwards along the first direction, so that the collector wall forms a wave shape surrounding the air inlet 20a. The outer surface of the protruding portion of the collector wall is the first outer surface 21, and the outer surface of the recessed portion of the collector wall is the second outer surface 22.

[0050] Specifically, the outer side of the collecting wall is the side of the collecting wall that is away from the air passage 100a, and the inner side of the collecting wall is the side of the collecting wall that is close to the air passage 100a.

[0051] The first outer surface 21 is actually a curved surface bulging outwards from the collector wall, and the second outer surface 21 is actually a curved surface concave inwards from the collector wall. That is, both the first and second outer surfaces 21 are curved surfaces with non-zero curvature. In other words, the outer surface of the collector wall is a wave-like shape surrounding the air inlet 20a. This arrangement not only reduces the formation of eddies but also provides better airflow guidance through the curved surface, allowing the airflow to flow smoothly along the outer surface of the collector wall.

[0052] Please see Figures 2 to 4 The first outer surface 21 and the second outer surface 22 can satisfy: Wherein, the maximum value of H is the maximum distance between the first outer surface 21 and the reference plane Y along the first direction, and the minimum value of H is the minimum distance between the second outer surface 22 and the reference plane Y along the first direction. The reference plane Y is a virtual plane located at the junction of the annular wall 10 and the flow collecting wall, and perpendicular to the first direction. M is the number of first outer surfaces 21, and T is the independent variable, where 0°≤T≤360°. The first phase angle adjustment parameter, and A is the first reference value, B is the first adjustment range, and h is the wall thickness of the centrifugal fan casing 100.

[0053] It should be noted that since multiple first outer surfaces 21 and multiple second outer surfaces 22 are alternately arranged around the periphery of the air inlet 20a, the number of first outer surfaces 21 is the same as the number of second outer surfaces 22. Therefore, M is also equivalent to the number of second outer surfaces 22.

[0054] It belongs to the sine function, and the maximum value of H is the maximum distance between the first outer surface 21 and the reference plane Y along the first direction, and the minimum value of H is the minimum distance between the second outer surface 22 and the reference plane Y along the first direction. That is to say, the maximum value of H is the highest point of the first outer surface 21 along the first direction, and the minimum value of H is the lowest point of the second outer surface 22 along the first direction. Therefore, In fact, it refers to the curve on the first outer surface 21 along the circumference of the air inlet 20a passing through the highest point of the first outer surface 21 and the curve on the second outer surface 22 along the circumference of the air inlet 20a passing through the lowest point of the second outer surface 22, which together form a curve that satisfies the condition of... The waveform of this sinusoidal function relationship, where the maximum value of H is the peak point of the waveform, and the minimum value of H is the trough point of the waveform.

[0055] H changes based on the first reference value A with the first adjustment range B as the maximum height change. The maximum value of H (the maximum distance between the first outer surface 21 and the reference plane Y along the first direction) is A+B+h, and the minimum value of H (the minimum distance between the second outer surface 22 and the reference plane Y along the first direction) is A-B+h.

[0056] The value of the first reference value A can be adjusted according to design needs. For example, the value of the first reference value A can be 6≤A≤40, such as A being 6, 12, 18, 34, 40, etc.

[0057] The value of the first adjustment range B can be adjusted according to design needs. For example, B can be 6.

[0058] The wall thickness h of the centrifugal fan casing 100 can also be adjusted according to design requirements. For example, the wall thickness h of the centrifugal fan casing 100 can be 0.5≤h≤5, such as 0.5, 2, 3.5, 5, etc.

[0059] The first outer surface 21 and the second outer surface 22 satisfy This sinusoidal function relationship makes it easier to form a regular wave shape in the collector wall, which in turn makes it easier to process and manufacture the collector wall.

[0060] It should be noted that the flow collecting wall is not limited to forming the first outer surface 21 and the second outer surface 22 by protrusion and depression respectively. For example, in some other embodiments, the flow collecting wall may have a portion of its area protruding outward along the first direction, and another portion of its area neither protruding inward nor inward along the first direction. In this case, the outer surface of the protruding portion of the flow collecting wall is the first outer surface 21, and the outer surface of the portion of the flow collecting wall that is neither concave nor convex is the second outer surface 22. Alternatively, the flow collecting wall may also have a portion of its area concave inward along the first direction, and another portion of its area neither concave inward nor convex in the first direction. In this case, the outer surface of the concave portion of the flow collecting wall is the second outer surface 22, and the outer surface of the portion of the flow collecting wall that is neither concave nor convex is the first outer surface 21.

[0061] In addition, the plurality of first outer surfaces 21 and the plurality of second outer surfaces 22 may not be alternately arranged around the periphery of the air inlet 20a. For example, in some other embodiments, the first outer surface 21 and the second outer surface 22 may be formed in a portion of the circumferential region of the air inlet 20a.

[0062] In one embodiment, please refer to Figures 2 to 4 On the radial cross-section of the collecting wall along the air inlet 20a, the outline of the first outer surface 21 includes a first curved segment 211 and a second curved segment 212 located on the side of the first curved segment 211 away from the air inlet 20a. The outline of the second outer surface 22 includes a third curved segment 221 and a fourth curved segment 222 located on the side of the third curved segment 221 away from the air inlet 20a. The first curved segment 211, the second curved segment 212, the third curved segment 221 and the fourth curved segment 222 all protrude outward from the outside of the collecting wall along the first direction.

[0063] In other words, on the radial cross-section of the collecting wall along the air inlet 20a, the first outer surface 21 and the second outer surface 22 can both be regarded as lines (i.e., the outline of the first outer surface 21) rather than surfaces. The parts of the first outer surface 21 corresponding to the first curve segment 211 and the parts corresponding to the second curve segment 212 are actually two curved surfaces on the first outer surface 21 that are radially arranged along the air inlet 20a and protrude outwards toward the collecting wall. The parts of the second outer surface 22 corresponding to the third curve segment 221 and the parts corresponding to the fourth curve segment 222 are actually two curved surfaces on the second outer surface 21 that are radially arranged along the air inlet 20a and protrude outwards toward the collecting wall.

[0064] The portion of the first outer surface 21 corresponding to the first curved segment 211 and the portion corresponding to the second curved segment 212 can smoothly guide the airflow flowing through the first outer surface 21 to the air inlet 20a. The portion of the second outer surface 22 corresponding to the third curved segment 221 and the portion corresponding to the fourth curved segment 222 can smoothly guide the airflow flowing through the second outer surface 22 to the air inlet 20a, thereby allowing the airflow to flow more gently along the first outer surface 21 or the second outer surface 22.

[0065] Please continue reading. Figures 2 to 4 The portion of the first outer surface 21 corresponding to the first curve segment 211 can smoothly transition to the portion of the second outer surface 22 corresponding to the third curve segment 221, and the portion of the first outer surface 21 corresponding to the second curve segment 212 can smoothly transition to the portion of the second outer surface 22 corresponding to the fourth curve segment 222.

[0066] A smooth transition means that there is no obvious protrusion or depression at the junction of two parts (such as the part of the first outer surface 21 corresponding to the first curve segment 211 and the part of the second outer surface 22 corresponding to the third curve segment 221), or in other words, the curvature of the two parts is continuous.

[0067] This configuration allows the gas passing through the junction of the first outer surface 21 and the second outer surface 22 to flow more smoothly, thereby effectively improving the overall flow guiding capacity of the flow collecting wall.

[0068] In one embodiment, please refer to Figures 2 to 4 The outline of the first outer surface 21 also includes a first straight line segment 213 located between the first curved segment 211 and the second curved segment 212, and the outline of the second outer surface 22 also includes a second straight line segment 223 located between the third curved segment 221 and the fourth curved segment 222. The part of the first outer surface 21 corresponding to the first straight line segment 213 and the part of the second outer surface 22 corresponding to the second straight line segment 223 are smoothly transitioned.

[0069] The portion of the first outer surface 21 corresponding to the first straight segment 213 and the portion of the second outer surface 22 corresponding to the second straight segment 223 can be considered as a plane in the radial direction of the air inlet 20a along the air collection wall. However, in the circumferential direction of the air inlet 20a, the portion of the first outer surface 21 corresponding to the first straight segment 213 and the portion of the second outer surface 22 corresponding to the second straight segment 223 are actually curved surfaces.

[0070] The portion of the first outer surface 21 corresponding to the first straight line segment 213 can smoothly transition to the portions of the first outer surface 21 corresponding to the first curved segment 211 and the second curved segment 212, respectively. The portion of the second outer surface 22 corresponding to the second straight line segment 223 can smoothly transition to the portions of the second outer surface 22 corresponding to the third curved segment 221 and the fourth curved segment 222, respectively.

[0071] Setting a first straight line segment 213 between the first curve segment 211 and the second curve segment 212, and setting a second straight line segment 223 between the third curve segment 221 and the fourth curve segment 222, is more conducive to expanding the overall area of ​​the first outer surface 21 and the second outer surface 22, thereby effectively increasing the volume of the air passage cavity 100a and improving the air passage performance of the centrifugal fan casing 100.

[0072] Please see Figures 2 to 4The highest point of the first outer surface 21 protruding along the first direction can be located at the part of the first outer surface 21 corresponding to the first straight line segment 213, and the lowest point of the second outer surface 22 concave along the first direction can be located at the part of the second outer surface 22 corresponding to the second straight line segment 223. This facilitates the formation of the first curved segment 211, the second curved segment 212, and the first straight line segment 213 of the first outer surface 21, as well as the third curved segment 221, the fourth curved segment 222, and the second straight line segment 223 of the first outer surface 21.

[0073] Please see Figures 2 to 4 The first straight segment 213 and the second straight segment 223 can both be parallel to the radial direction of the air inlet 20a. The radial width L of the first straight segment 213 and the second straight segment 223 satisfies: L=E+F×sin(MT+Φ). Where M is the number of first outer surfaces 21, T is the independent variable and 0°≤T≤360°, Φ is the second phase angle adjustment parameter and 0°≤Φ≤360°, E is the second reference value, and F is the second adjustment range.

[0074] It should be noted that since multiple first outer surfaces 21 and multiple second outer surfaces 22 are alternately arranged around the periphery of the air inlet 20a, the number of first outer surfaces 21 is the same as the number of second outer surfaces 22. Therefore, M is also equivalent to the number of second outer surfaces 22. The value of the second adjustment range F can be adjusted according to design needs. For example, the second adjustment range F can be 3.

[0075] The value of the first reference value E can be adjusted according to design requirements. For example, the value of the first reference value E can be 3 < E ≤ 80, such as 4, 36, 68, 80, etc.

[0076] The width L of the first straight segment 213 and the second straight segment 223 along the radial direction of the air inlet 20a satisfies the sinusoidal function relationship L=E+F×sin(MT+Φ), which facilitates the setting of the first straight segment 213 and the second straight segment 223, and also facilitates a smooth transition between the part of the first outer surface 21 corresponding to the first straight segment 213 and the part of the second outer surface 22 corresponding to the second straight segment 223.

[0077] It should be noted that the first straight segment 213 and the second straight segment 223 are not limited to being radially parallel to the air inlet 20a. In other embodiments, at least one of the first straight segment 213 and the second straight segment 223 may also be radially inclined relative to the air inlet 20a.

[0078] In one embodiment, please refer to Figure 2 The distance S between the collector wall and the impeller 200 along the first direction can satisfy: 3mm≤S≤10mm. For example, S can be 3mm, 5mm, 8mm, 10mm, etc.

[0079] When the distance S between the collector wall and the impeller 200 along the first direction is greater than 10mm, the gap between the collector wall and the impeller 200 is large, and a large amount of airflow is easily lost at the gap. When the distance S between the collector wall and the impeller 200 along the first direction is less than 3mm, the gap between the collector wall and the impeller 200 is small, and the safe distance between the collector wall and the impeller 200 is difficult to meet the requirements. Therefore, setting S to 3mm≤S≤10mm can both minimize the loss of a large amount of airflow and ensure that the collector wall and the impeller 200 maintain a safe distance.

[0080] In one embodiment, please refer to Figure 2 The diameter D1 of the air inlet 20a satisfies: D2×0.9≤D1≤D2×1.1, where D2 is the diameter of the impeller air inlet 200a. In other words, the diameter D1 of the air inlet 20a on the collector wall is approximately the same as the diameter D2 of the impeller air inlet 200a. This minimizes the radial gap between the air inlet 20a and the impeller 200 along the air inlet 20a, thus preventing significant loss of airflow from the air inlet 20a to the impeller air inlet 200a at the gap.

[0081] Another embodiment of this application provides an air conditioner that includes the centrifugal fan described in any embodiment of this application.

[0082] In the description of this application, the references to terms such as "in one embodiment," "in some embodiments," "in other embodiments," "in yet another embodiment," or "exemplary," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the embodiments of this application. In this application, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine the different embodiments or examples described in this application, as well as the features of the different embodiments or examples.

[0083] The above description is merely a preferred embodiment of this application and is not intended to limit the application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application are included within the scope of protection of this application.

Claims

1. A centrifugal fan volute, characterized by, The air conditioner comprises: a ring wall; two side walls, each of which is arranged on opposite sides of the ring wall along a first direction and cooperates with the ring wall to define a through-air cavity with an air outlet; at least one of the two side walls is a flow collecting wall, which is provided with an air inlet communicating with the through-air cavity, and has a first outer surface and a second outer surface on a side thereof away from the through-air cavity, the first outer surface and the second outer surface are arranged along the circumference of the air inlet, and the first outer surface and the second outer surface form a height difference in the first direction.

2. The centrifugal fan volute of claim 1, wherein, The number of the first outer surface and the second outer surface is multiple, and the multiple first outer surfaces and the multiple second outer surfaces are alternately arranged around the circumference of the air inlet.

3. The centrifugal fan volute according to claim 1 or 2, characterized in that Part of the flow collecting wall protrudes outward along the first direction, and another part of the flow collecting wall is recessed inward along the first direction, so that the flow collecting wall forms a wave shape around the circumference of the air inlet, wherein the outer surface of the protruding part of the flow collecting wall is the first outer surface, and the outer surface of the recessed part of the flow collecting wall is the second outer surface.

4. The centrifugal fan volute of claim 3, wherein, The first outer surface and the second outer surface satisfy: wherein a maximum value of H is a maximum value of a distance of the first outer surface from a reference plane along the first direction, a minimum value of H is a minimum value of a distance of the second outer surface from the reference plane along the first direction, the reference plane is a virtual plane located at an intersection of the ring wall and the current collecting wall and perpendicular to the first direction, M is the number of the first outer surfaces, T is a variable and 0°≤T≤360°, is a first phase angle adjustment parameter, and A is a first reference value, B is a first adjustment amplitude, and h is a wall thickness of the current collecting wall.

5. The centrifugal fan volute of claim 4, wherein, 6≤A≤40, B=6, 0.5≤h≤5.

6. The centrifugal fan volute of claim 3, wherein On a cross section of the flow collecting wall along a radial direction of the air inlet, a profile line of the first outer surface comprises a first curve segment and a second curve segment on a side of the first curve segment away from the air inlet, a profile line of the second outer surface comprises a third curve segment and a fourth curve segment on a side of the third curve segment away from the air inlet, and the first curve segment, the second curve segment, the third curve segment and the fourth curve segment all protrude outward along the first direction.

7. The centrifugal fan volute of claim 6, wherein, The part of the first outer surface corresponding to the first curve segment and the part of the second outer surface corresponding to the third curve segment are smoothly connected, and the part of the first outer surface corresponding to the second curve segment and the part of the second outer surface corresponding to the fourth curve segment are smoothly connected.

8. The centrifugal fan volute of claim 7, wherein, The profile line of the first outer surface further comprises a first straight line segment between the first curve segment and the second curve segment, the profile line of the second outer surface further comprises a second straight line segment between the third curve segment and the fourth curve segment, and the part of the first outer surface corresponding to the first straight line segment and the part of the second outer surface corresponding to the second straight line segment are smoothly connected.

9. The centrifugal fan volute of claim 8, wherein, The highest point of the first outer surface protruding along the first direction is located at the part of the first outer surface corresponding to the first straight line segment, and the lowest point of the second outer surface recessing along the first direction is located at the part of the first outer surface corresponding to the first straight line segment.

10. The centrifugal fan volute of claim 9, wherein, The first straight line segment and the second straight line segment are parallel to the radial direction, and the width L of the first straight line segment and the second straight line segment along the radial direction satisfies: L=E+F×sin(MT+Φ). Wherein, M is the number of the first outer surface, T is an independent variable and 0°≤T≤360°, Φ is a second phase angle adjustment parameter and 0°≤Φ≤360°, E is a second reference value, and F is a second adjustment amplitude.

11. The centrifugal fan volute of claim 10, wherein, 3 < E ≤ 80, F = 3.

12. A centrifugal fan characterized by The centrifugal fan comprises a wind wheel with a wind wheel air inlet and the centrifugal fan volute according to any one of claims 1-11, the wind wheel is arranged in the air passing cavity, and the wind wheel air inlet faces the air inlet.

13. The centrifugal fan of claim 12, wherein The distance S between the air collecting wall and the wind wheel in the first direction satisfies 3mm≤S≤10mm.

14. The centrifugal fan of claim 12, wherein The diameter D1 of the air inlet satisfies D2×0.9≤D1≤D2×1.1, wherein D2 is the diameter of the wind wheel air inlet.

15. An air conditioner characterized by comprising: The air conditioner comprises the centrifugal fan according to any one of claims 12-14.

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