Spiral case, fan and air conditioner

Abstract

The application provides a volute, a fan and an air conditioner. The volute comprises: a volute main body, comprising a fan blade mounting portion for mounting a fan blade assembly and two air duct portions which are arranged at two sides of the fan blade mounting portion along a first direction; opposite sides of each air duct portion which are arranged along a second direction are connected with the fan blade mounting portion, and a first air duct profile line and a second air duct profile line are formed between the opposite sides and the fan blade mounting portion, respectively; a connection between a side of each air duct portion close to the first air duct profile line and the fan blade mounting portion is arranged in a streamline shape; and a connection between a side of each air duct portion close to the second air duct profile line and the fan blade mounting portion is a volute tongue; and at least one air duct portion is provided with a convex envelope on opposite sides which are arranged along an axis of rotation of the fan blade assembly. The first direction and the second direction are perpendicular to each other and perpendicular to the axis of rotation of the fan blade assembly, so as to solve the problems of low fan efficiency and discontinuous aerodynamic noise at the outlet of the volute in the prior art.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and more specifically, to a volute, a fan, and an air conditioner. Background Technology

[0002] Currently, distributed air supply technology has gained high recognition in the air conditioning market. However, due to its high cost, it is mainly used in high-end products, which leads to its insufficient market competitiveness.

[0003] After long-term research and development, distributed air supply technology has been significantly improved, reducing the number of fans from the initial three to a single centrifugal fan with equivalent performance. This represents a major breakthrough in cost reduction and efficiency improvement.

[0004] However, due to the problems of large lateral dimensions and low fan efficiency in single-centrifugal distributed air supply systems, there is still considerable room for improvement in fan performance. In order to achieve greater breakthroughs in cost reduction and efficiency improvement, it is urgent to develop more competitive single-centrifugal distributed air supply systems.

[0005] Because double-suction centrifugal fans have the characteristics of large flow coefficient and good noise quality, we chose to research and develop a brand-new single-centrifugal double-suction fan to improve the performance of centrifugal fans and achieve further cost reduction and efficiency improvement.

[0006] However, the high-pressure airflow at the outlet of the double-suction volute is prone to backflow, which can easily cause eddy current loss and backflow loss inside the volute, resulting in reduced fan efficiency. At the same time, it can also cause discontinuous aerodynamic noise at the outlet of the volute, resulting in poor sound quality of the air conditioner. Summary of the Invention

[0007] The main objective of this invention is to provide a volute, a fan, and an air conditioner to solve the problems of low fan efficiency and discontinuous aerodynamic noise at the outlet of the volute in the prior art of single centrifugal double-suction fans.

[0008] To achieve the above objectives, according to a first aspect of the present invention, a volute is provided, comprising: a volute body, the volute body including a fan blade mounting portion for mounting a fan blade assembly and two air duct portions spaced apart along a first direction on both sides of the fan blade mounting portion and communicating with the fan blade mounting portion, the fan blade mounting portion being used to mount the fan blade assembly; each air duct portion having a first air duct profile and a second air duct profile formed between its opposite sides spaced apart along a second direction and the fan blade mounting portion, the connection between the side of each air duct portion near the first air duct profile and the fan blade mounting portion being streamlined, and the connection between the side of each air duct portion near the second air duct profile and the fan blade mounting portion being a volute tongue; at least one air duct portion having protrusions on its opposite sides spaced apart along the rotation axis of the fan blade assembly, protruding in a direction away from the corresponding air duct portion; wherein the first direction and the second direction are perpendicular to each other and both perpendicular to the rotation axis of the fan blade assembly.

[0009] Further, the convex bulge includes: an upper surface, which is spaced apart from the air duct portion; a first side and a second side, which are respectively located on opposite sides of the upper surface spaced apart along the extension direction of the air duct portion, the first side being located on the side of the upper surface away from the fan blade mounting portion, and the second side being located on the side of the upper surface close to the fan blade mounting portion; a third side and a fourth side, which are respectively located on opposite sides of the upper surface spaced apart along a direction perpendicular to the extension direction of the air duct portion, the third side being located on the side of the upper surface close to the first air duct profile, and the fourth side being located on the side of the upper surface close to the second air duct profile; wherein, the upper surface is connected to the outer surface of the air duct portion through the first side, the second side, the third side, and the fourth side.

[0010] Furthermore, the inner wall surface of the convex bulge near the tongue is connected to the inner wall surface of the main body of the volute near the tongue.

[0011] Furthermore, the formula for calculating the first air duct profile is: ;in, ; ; ; ; The dimension of the first air duct profile in the second direction is defined by the intersection of a straight line parallel to the second direction and passing through the rotation axis of the fan blade assembly with the side of the volute body closest to the first air duct profile. The dimension of the first air duct profile in the first direction is taken as the starting point of the rotation axis of the fan blade assembly.

[0012] Furthermore, the calculation formula for the second air duct profile is as follows: L is the total length of the air duct, 300mm≤L≤400mm; θ is the angle between the extension direction of the second air duct profile and the second direction, 55°≤θ≤65°; l is the length of the second air duct profile.

[0013] Furthermore, the minimum distance between the convex hull and the volute tongue is c, where 0mm≤c≤5mm; the width of the convex hull in the extension direction of the air duct is a, where 65mm≤a≤75mm; the length of the convex hull in the direction perpendicular to the extension direction of the air duct is b, where 65mm≤b≤75mm; and the height of the convex hull in the direction parallel to the rotation axis of the fan blade assembly is h, where 8mm≤h≤12mm.

[0014] Furthermore, the angle between the upper surface and the first side surface is β, where 15°≤β≤25°; the angle between the upper surface and the second side surface is α, where 30°≤α≤40°; and the angle between the upper surface and the fourth side surface is γ, where 40°≤γ≤50°.

[0015] Furthermore, the inner wall surface of the convex bulge on the side away from the volute tongue is connected to the inner wall surface of the volute body on the side away from the volute tongue.

[0016] Furthermore, the calculation formula for the second air duct profile is as follows: L is the total length of the air duct, 300mm≤L≤400mm; θ is the angle between the extension direction of the second air duct profile and the second direction, 55°≤θ≤65°; l is the length of the second air duct profile.

[0017] Furthermore, the minimum distance between the convex hull and the volute tongue is c, where 0mm≤c≤5mm; the width of the convex hull in the extension direction of the air duct is a, where 65mm≤a≤75mm; the length of the convex hull in the direction perpendicular to the extension direction of the air duct is b, where 85mm≤b≤95mm; and the height of the convex hull in the direction parallel to the rotation axis of the fan blade assembly is h, where 8mm≤h≤12mm.

[0018] Furthermore, gaps are left between the two inner wall surfaces of the convex hull that are respectively close to the first and second air duct profiles and the inner wall surface of the volute body.

[0019] Furthermore, the calculation formula for the second air duct profile is as follows: Where L is the total length of the air duct, 300mm≤L≤400mm; θ is the angle between the extension direction of the second air duct profile and the second direction, 55°≤θ≤65°; and l is the length of the second air duct profile.

[0020] Furthermore, the minimum distance between the convex hull and the volute tongue is c, where 0mm≤c≤5mm; the width of the convex hull in the extension direction of the air duct is a, where 65mm≤a≤75mm; the length of the convex hull in the direction perpendicular to the extension direction of the air duct is b, where 50mm≤b≤60mm; and the height of the convex hull in the direction parallel to the rotation axis of the fan blade assembly is h, where 8mm≤h≤12mm.

[0021] According to a second aspect of the present invention, a fan is provided, comprising the aforementioned volute and a fan blade assembly disposed within the volute.

[0022] According to a third aspect of the present invention, an air conditioner is provided, comprising the aforementioned fan.

[0023] Applying the technical solution of the present invention, the volute of the present invention includes: a volute body, the volute body including a fan blade mounting portion for mounting a fan blade assembly and two air duct portions spaced apart along a first direction on both sides of the fan blade mounting portion and both communicating with the fan blade mounting portion; the fan blade mounting portion is used to mount the fan blade assembly; each air duct portion forms a first air duct profile and a second air duct profile between its opposite sides spaced apart along a second direction and the fan blade mounting portion, respectively; the connection between the side of each air duct portion near the first air duct profile and the fan blade mounting portion is streamlined; the connection between the side of each air duct portion near the second air duct profile and the fan blade mounting portion is a volute tongue; at least one air duct portion has protrusions on its opposite sides spaced apart along the rotation axis of the fan blade assembly, protruding in a direction away from the corresponding air duct portion; wherein, the first direction and the second direction are perpendicular to each other and both perpendicular to the rotation axis of the fan blade assembly. In this way, the volute of the present invention, by setting the first air duct profile, the second air duct profile, and the convex bulge, increases the air volume of the dual-suction single centrifugal fan, improves the uneven distribution of airflow velocity in the air duct, reduces the aerodynamic noise of the dual-suction centrifugal fan, improves the working performance of the centrifugal fan, and adjusts the direction of the outlet airflow. It can effectively suppress the backflow phenomenon in different wind modes, effectively reduce the vortex in the air duct, reduce airflow loss, improve noise problems such as outlet air duct surge and discontinuous airflow, improve the user's comfort experience, and solve the problems of low fan efficiency and discontinuous aerodynamic noise at the outlet of the volute of the prior art single centrifugal dual-suction fan. Attached Figure Description

[0024] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0025] Figure 1 A simplified schematic diagram of an embodiment of the volute according to the present invention is shown with some reference numerals indicated.

[0026] Figure 2 It shows Figure 1 The illustrated embodiment of the volute is a simplified schematic diagram with other reference numerals indicating the different parts.

[0027] Figure 3 It shows Figure 2 The image shows a magnified view of the volute at point P.

[0028] Figure 4 It shows Figure 1 A magnified view of a portion of the convex hull of the volute shown;

[0029] Figure 5 It shows having Figure 1 The diagram shows the structure of a fan with a volute casing.

[0030] Figure 6 An airflow distribution diagram of the duct section of a volute in the prior art is shown;

[0031] Figure 7 It shows Figure 1 The airflow distribution diagram of the air duct section in the embodiment of the volute shown;

[0032] Figure 8 A cross-sectional view of the airflow velocity distribution in the duct section of a volute in the prior art is shown;

[0033] Figure 9 It shows Figure 1 A cross-sectional view of the airflow velocity distribution in the duct section of an embodiment of the volute shown.

[0034] The above figures include the following reference numerals:

[0035] 1. Volute body; 2. Fan blade assembly; 3. Fan blade mounting section; 4. Air duct section; 5. First air duct profile; 6. Second air duct profile; 7. Volute tongue;

[0036] 8. Convex hull; 81. Top surface; 82. First side surface; 83. Second side surface; 84. Third side surface; 85. Fourth side surface. Detailed Implementation

[0037] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0038] like Figures 1 to 5 As shown, the present invention provides a volute, comprising: a volute body 1, the volute body 1 including a fan blade mounting portion 3 for mounting a fan blade assembly 2 and two air duct portions 4 spaced apart along a first direction on both sides of the fan blade mounting portion 3 and communicating with the fan blade mounting portion 3; the fan blade mounting portion 3 is used to mount the fan blade assembly 2; a first air duct profile 5 and a second air duct profile 6 are respectively formed between the opposite sides of each air duct portion 4 spaced apart along a second direction and the fan blade mounting portion 3; the connection between the side of each air duct portion 4 near the first air duct profile 5 and the fan blade mounting portion 3 is streamlined; the connection between the side of each air duct portion 4 near the second air duct profile 6 and the fan blade mounting portion 3 is a volute tongue 7; at least one air duct portion 4 has a convex bulge 8 on its opposite sides spaced apart along the rotation axis of the fan blade assembly 2, protruding in a direction away from the corresponding air duct portion 4; wherein the first direction and the second direction are perpendicular to each other and both perpendicular to the rotation axis of the fan blade assembly 2.

[0039] In this way, the volute of the present invention, by setting the first air duct profile 5, the second air duct profile 6, and the convex bulge 8, increases the air volume of the dual-suction single centrifugal fan, improves the uneven distribution of airflow velocity in the air duct, reduces the aerodynamic noise of the dual-suction centrifugal fan, improves the working performance of the centrifugal fan, and adjusts the direction of the outlet airflow. It can effectively suppress the backflow phenomenon in different wind modes, effectively reduce the vortex in the air duct, reduce airflow loss, improve noise problems such as outlet air duct surge and discontinuous airflow, improve the user's comfort experience, and solve the problems of low fan efficiency and discontinuous aerodynamic noise at the outlet of the volute of the prior art single centrifugal dual-suction fan.

[0040] like Figure 3 and Figure 4 As shown, the convex bulge 8 includes: an upper surface 81, which is spaced apart from the air duct portion 4; a first side surface 82 and a second side surface 83, which are respectively located on opposite sides of the upper surface 81 along the extending direction of the air duct portion 4, with the first side surface 82 located on the side of the upper surface 81 away from the fan blade mounting portion 3 and the second side surface 83 located on the side of the upper surface 81 close to the fan blade mounting portion 3; a third side surface 84 and a fourth side surface 85, which are respectively located on opposite sides of the upper surface 81 along a direction perpendicular to the extending direction of the air duct portion 4, with the third side surface 84 located on the side of the upper surface 81 close to the first air duct profile 5 and the fourth side surface 85 located on the side of the upper surface 81 close to the second air duct profile 6; wherein, the upper surface 81 is connected to the outer surface of the air duct portion 4 through the first side surface 82, the second side surface 83, the third side surface 84 and the fourth side surface 85.

[0041] In the first and second embodiments of the present invention, the inner wall surface of the convex 8 near the volute tongue 7 is connected to the inner wall surface of the volute body 1 near the volute tongue 7 to guide the airflow direction, reduce the mutual impact of airflow, thereby reducing the vortex in the air cavity and reducing surge noise.

[0042] In the first embodiment of the present invention, the calculation formula for the first air duct profile 5 is as follows: ;in, ; ; ; ; The dimension of the first air duct profile 5 in the second direction is defined by the intersection of a straight line parallel to the second direction and passing through the rotation axis of the fan blade assembly 2 with the side of the volute body 1 closest to the first air duct profile 5. The dimension of the first air duct profile 5 in the first direction is taken as the starting point of the rotation axis of the fan blade assembly 2.

[0043] In the first embodiment of the present invention, the calculation formula for the second air duct profile 6 is as follows: L is the total length of the air duct, 300mm≤L≤400mm; θ is the angle between the extension direction of the second air duct profile 6 and the second direction, 55°≤θ≤65°; l is the length of the second air duct profile 6.

[0044] In the first embodiment of the present invention, the minimum distance between the convex bulge 8 and the volute tongue 7 is c, where 0mm≤c≤5mm; the width of the convex bulge 8 in the extending direction of the air duct 4 is a, where 65mm≤a≤75mm; the length of the convex bulge 8 in the direction perpendicular to the extending direction of the air duct 4 is b, where 65mm≤b≤75mm; and the height of the convex bulge 8 in the direction parallel to the rotation axis of the fan blade assembly 2 is h, where 8mm≤h≤12mm.

[0045] In the first embodiment of the present invention, the included angle between the upper surface 81 and the first side surface 82 is β, wherein 15°≤β≤25°; the included angle between the upper surface 81 and the second side surface 83 is α, wherein 30°≤α≤40°; and the included angle between the upper surface 81 and the fourth side surface 85 is γ, wherein 40°≤γ≤50°.

[0046] This effectively improves the performance of the bidirectional centrifugal fan, reduces production costs, and adjusts the airflow direction within the duct in different wind modes, thereby increasing the fan's air volume. Even with the rear-mounted air guide plate, which may result in a slightly less pleasant user experience, it effectively curbs airflow backflow and reduces vortices within the duct, improving the airflow field within the fan duct, reducing aerodynamic noise, and enhancing the overall sound quality of the fan, thus improving user comfort.

[0047] In the second embodiment of the present invention, the inner wall surface of the convex 8 on the side near the volute tongue 7 is connected to the inner wall surface of the volute body 1 on the side near the volute tongue 7, and the inner wall surface of the convex 8 on the side away from the volute tongue 7 is connected to the inner wall surface of the volute body 1 on the side away from the volute tongue 7, so as to adjust the airflow direction, reduce the mutual impact of airflow, reduce the vortex in the air cavity, and thus reduce surge noise.

[0048] In the second embodiment of the present invention, the calculation formula for the second air duct profile 6 is as follows: L is the total length of the air duct, 300mm≤L≤400mm; θ is the angle between the extension direction of the second air duct profile 6 and the second direction, 55°≤θ≤65°; l is the length of the second air duct profile 6.

[0049] In the second embodiment of the present invention, the minimum distance between the convex bulge 8 and the volute tongue 7 is c, where 0mm≤c≤5mm; the width of the convex bulge 8 in the extending direction of the air duct 4 is a, where 65mm≤a≤75mm; the length of the convex bulge 8 in the direction perpendicular to the extending direction of the air duct 4 is b, where 85mm≤b≤95mm; and the height of the convex bulge 8 in the direction parallel to the rotation axis of the fan blade assembly 2 is h, where 8mm≤h≤12mm.

[0050] In the third embodiment of the present invention, gaps are left between the two inner wall surfaces of the convex bulge 8 that are close to the first air duct profile 5 and the second air duct profile 6 and the inner wall surface of the volute body 1, so as to adjust the airflow direction, reduce the mutual impact of airflow, reduce the vortex in the air cavity, and thus reduce the surge noise.

[0051] In the third embodiment of the present invention, the calculation formula for the second air duct profile 6 is as follows: Where L is the total length of the air duct, 300mm≤L≤400mm; θ is the angle between the extension direction of the second air duct profile 6 and the second direction, 55°≤θ≤65°; and l is the length of the second air duct profile 6.

[0052] In the third embodiment of the present invention, the minimum distance between the convex bulge 8 and the volute tongue 7 is c, where 0mm≤c≤5mm; the width of the convex bulge 8 in the extending direction of the air duct 4 is a, where 65mm≤a≤75mm; the length of the convex bulge 8 in the direction perpendicular to the extending direction of the air duct 4 is b, where 50mm≤b≤60mm; and the height of the convex bulge 8 in the direction parallel to the rotation axis of the fan blade assembly 2 is h, where 8mm≤h≤12mm.

[0053] like Figure 5 As shown, the present invention provides a fan, including the aforementioned volute and a fan blade assembly 2 disposed within the volute.

[0054] Specifically, the fan is also equipped with a guide vane. By controlling the rotation angle of the guide vane, the guide vane can be tilted forward to tilt and send the airflow upward, or the guide vane can be tilted backward to press the airflow downward, thus achieving a variety of wind sensation experiences.

[0055] The present invention also provides an air conditioner including the aforementioned fan.

[0056] like Figure 6 The diagram shown illustrates the airflow distribution within the duct section of a volute in the prior art. The presence of vortices and uneven flow field distribution within the duct section easily generates aerodynamic noise, thus affecting the fan's performance and overall sound quality. Figure 7 As can be seen from the airflow distribution diagram of the duct section of the volute of the present invention, the volute of the present invention greatly improves the above-mentioned problems.

[0057] like Figure 8 The diagram shows a cross-sectional view of the airflow velocity distribution in the duct section of a volute in the prior art. Airflow within the duct experiences backflow, resulting in backflow losses. This reduces airflow volume and the volute's working efficiency; furthermore, the backflow generates significant aerodynamic noise. Figure 9 As can be seen from the cross-sectional view of the airflow velocity distribution of the duct section of the volute of the present invention, the volute of the present invention greatly improves the above-mentioned problems.

[0058] As can be seen from the above description, the embodiments of the present invention achieve the following technical effects:

[0059] The volute of the present invention includes: a volute body 1, the volute body 1 including a fan blade mounting portion 3 for mounting a fan blade assembly 2 and two air duct portions 4 spaced apart along a first direction on both sides of the fan blade mounting portion 3 and communicating with the fan blade mounting portion 3; the fan blade mounting portion 3 is used to mount the fan blade assembly 2; a first air duct profile 5 and a second air duct profile 6 are respectively formed between the opposite sides of each air duct portion 4 spaced apart along a second direction and the fan blade mounting portion 3; the connection between the side of each air duct portion 4 near the first air duct profile 5 and the fan blade mounting portion 3 is streamlined; the connection between the side of each air duct portion 4 near the second air duct profile 6 and the fan blade mounting portion 3 is a volute tongue 7; at least one air duct portion 4 has a protrusion 8 on its opposite sides spaced apart along the rotation axis of the fan blade assembly 2, protruding in a direction away from the corresponding air duct portion 4; wherein the first direction and the second direction are perpendicular to each other and both perpendicular to the rotation axis of the fan blade assembly 2. In this way, the volute of the present invention, by setting the first air duct profile 5, the second air duct profile 6, and the convex bulge 8, increases the air volume of the dual-suction single centrifugal fan, improves the uneven distribution of airflow velocity in the air duct, reduces the aerodynamic noise of the dual-suction centrifugal fan, improves the working performance of the centrifugal fan, and adjusts the direction of the outlet airflow. It can effectively suppress the backflow phenomenon in different wind modes, effectively reduce the vortex in the air duct, reduce airflow loss, improve noise problems such as outlet air duct surge and discontinuous airflow, improve the user's comfort experience, and solve the problems of low fan efficiency and discontinuous aerodynamic noise at the outlet of the volute of the prior art single centrifugal dual-suction fan.

[0060] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0061] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0062] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not 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 scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0063] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0064] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this application.

[0065] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A volute, characterized in that, The application relates to a volute body (1) comprising a fan blade mounting portion (3) for mounting a fan blade assembly (2) and two air duct portions (4) arranged at two sides of the fan blade mounting portion (3) along a first direction and communicating with the fan blade mounting portion (3), each air duct portion (4) is provided with a first air duct profile (5) and a second air duct profile (6) respectively formed between the air duct portion (4) and the fan blade mounting portion (3) along a second direction, the connection between the air duct portion (4) and the fan blade mounting portion (3) on the side close to the first air duct profile (5) is provided in a streamline shape, and the connection between the air duct portion (4) and the fan blade mounting portion (3) on the side close to the second air duct profile (6) is a volute tongue (7), at least one air duct portion (4) is provided with a convex (8) protruding away from the corresponding air duct portion (4) on the opposite sides along the rotation axis of the fan blade assembly (2), the first direction and the second direction are perpendicular to each other and perpendicular to the rotation axis of the fan blade assembly (2), the convex (8) comprises an upper surface (81) arranged away from the air duct portion (4), a first side (82) and a second side (83) arranged on the opposite sides of the upper surface (81) along the extension direction of the air duct portion (4), the first side (82) is located on the side of the upper surface (81) away from the fan blade mounting portion (3), and the second side (83) is located on the side of the upper surface (81) close to the fan blade mounting portion (3), a third side (84) and a fourth side (85) are arranged on the opposite sides of the upper surface (81) along a direction perpendicular to the extension direction of the air duct portion (4), the third side (84) is located on the side of the upper surface (81) close to the first air duct profile (5), and the fourth side (85) is located on the side of the upper surface (81) close to the second air duct profile (6), the upper surface (81) is connected with the outer surface of the air duct portion (4) through the first side (82), the second side (83), the third side (84) and the fourth side (85), the inner wall surface of the side of the convex (8) close to the volute tongue (7) is connected with the inner wall surface of the side of the volute body (1) close to the volute tongue (7), the calculation formula of the first air duct profile (5) is: wherein, the calculation formula of the second air duct profile (6) is:

5. The volute according to claim 3 or 4, wherein, the minimum distance between the convex (8) and the volute tongue (7) is c, wherein, 0mm<=c<=5mm. ​ ​ ​ ​ ​ ​ ​ ​ ​ 2. The volute of claim 1, wherein ​ 3. The volute of claim 2, wherein ​ ； ​ ； ； ； ； the dimension of the first duct profile (5) in the second direction, from the intersection of a straight line parallel to the second direction and passing through the rotation axis of the impeller assembly (2) with the side of the volute body (1) close to the first duct profile (5); The size of the first air duct profile (5) in the first direction, taken from the rotational axis of the fan blade assembly (2).

4. The volute of claim 3, wherein ​ ; wherein L is the total length of the air duct, 300 mm < L < 400 mm; θ is the angle between the extension direction of the second air duct profile (6) and the second direction, 55° < θ < 65°; and I is the length of the second air duct profile (6). ​ ​ A width of the convex (8) in the extension direction of the air duct part (4) is a, wherein 65mm≤a≤75mm; A length of the convex (8) in the direction perpendicular to the extension direction of the air duct part (4) is b, wherein 65mm≤b≤75mm; A height of the convex (8) in the direction parallel to the rotation axis of the fan blade assembly (2) is h, wherein 8mm≤h≤12mm.

6. The volute according to claim 5, wherein, An included angle between the upper surface (81) and the first side surface (82) is β, wherein 15°≤β≤25°; An included angle between the upper surface (81) and the second side surface (83) is α, wherein 30°≤α≤40°; An included angle between the upper surface (81) and the fourth side surface (85) is γ, wherein 40°≤γ≤50°.

7. The volute of claim 2, wherein An inner wall surface of a side of the convex (8) away from the volute tongue (7) is connected with an inner wall surface of a side of the volute body (1) away from the volute tongue (7).

8. The volute of claim 7, wherein, A calculation formula of the second air duct profile (6) is: ； wherein, L is a total length of the air duct, 300mm≤L≤400mm; θ is an included angle between the extension direction of the second air duct profile (6) and the second direction, 55°≤θ≤65°, l is a length of the second air duct profile (6).

9. The volute according to claim 8, wherein, A minimum distance between the convex (8) and the volute tongue (7) is c, wherein 0mm≤c≤5mm; A width of the convex (8) in the extension direction of the air duct part (4) is a, wherein 65mm≤a≤75mm; A length of the convex (8) in the direction perpendicular to the extension direction of the air duct part (4) is b, wherein 85mm≤b≤95mm; A height of the convex (8) in the direction parallel to the rotation axis of the fan blade assembly (2) is h, wherein 8mm≤h≤12mm.

10. The volute of claim 1, wherein, Two inner wall surfaces of the convex (8) respectively close to the first air duct profile (5) and the second air duct profile (6) are both left with gaps with the inner wall surface of the volute body (1).

11. The volute of claim 10, wherein, A calculation formula of the second air duct profile (6) is: ； wherein, L is a total length of the air duct, 300mm≤L≤400mm; θ is an included angle between the extension direction of the second air duct profile (6) and the second direction, 55°≤θ≤65°; l is a length of the second air duct profile (6).

12. The volute according to claim 11, wherein, A minimum distance between the convex (8) and the volute tongue (7) is c, wherein 0mm≤c≤5mm; A width of the convex (8) in the extension direction of the air duct part (4) is a, wherein 65mm≤a≤75mm; A length of the convex (8) in the direction perpendicular to the extension direction of the air duct part (4) is b, wherein 50mm≤b≤60mm; The convex hull (8) has a height h in a direction parallel to the rotation axis of the fan blade assembly (2), wherein 8mm≤h≤12mm.

13. A fan, characterized by A fan comprising the volute of any one of claims 1 to 12 and a fan blade assembly (2) disposed within the volute.

14. An air conditioner characterized by comprising: A fan comprising the fan of claim 13.

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