Centrifugal fan and volute thereof

Abstract

The utility model relates to the field of air conditioning system end devices, in particular to a centrifugal fan and a volute thereof. According to the technical scheme, a volute cavity used for installing a centrifugal impeller is formed in the volute, an air inlet is formed in the axial side face of the volute, and an air outlet is formed in the circumferential side face of the volute; an air channel from the volute cavity to the air outlet is further formed in the volute. A diffusion-shaped air channel expanding in the outlet direction is formed between the upper edge side wall and the lower edge side wall of an air outlet of the volute. A plurality of convex points are arranged on the inner side wall face of the upper edge side wall of the air outlet in an array mode, and a plurality of concave points are arranged on the inner side wall face of the lower edge side wall of the air outlet in an array mode. The scheme has the advantages of reducing noise, stabilizing airflow and improving wind pressure.

Description

Technical Field

[0001] This utility model relates to the field of terminal devices for air conditioning systems, and in particular to a centrifugal fan and its volute. Background Art

[0002] Centrifugal fans are one of the terminal devices in air conditioning systems and play a vital role. Current centrifugal fans mainly consist of a fan casing and a centrifugal impeller installed inside the casing. The casing's shape resembles a snail shell, and its structural design directly affects the fan's performance and efficiency.

[0003] The centrifugal fan has an air inlet on its axial side and an air outlet on its circumferential side. Internally, it contains a volute cavity and a duct connecting the cavity and the outlet, with the centrifugal impeller installed inside. This design aims to achieve efficient airflow and pressure conversion. The centrifugal fan works by having the impeller rotate at high speed driven by a motor, centrifugally propelling airflow out of the outlet while simultaneously creating negative pressure within the volute cavity, drawing air in through the inlet. Theoretically, this method can achieve efficient air circulation and pressure boosting. However, existing centrifugal fans suffer from several significant problems in actual operation. First, the fan noise is high, affecting user experience and potentially causing environmental noise pollution. Second, unstable airflow can lead to uneven cooling or heating in air conditioning systems, affecting indoor temperature stability. Finally, reduced air pressure is a common issue, directly impacting the fan's performance and efficiency. These problems severely restrict the application and development of centrifugal fans. Noise issues may discourage users from using air conditioning systems for extended periods, while unstable airflow and reduced air pressure can increase energy consumption and decrease the overall efficiency of the air conditioning system. Therefore, improving the design of existing centrifugal fans, particularly the structure of the volute casing, to address these problems has become an important direction for technological development in this field.

[0004] To address the aforementioned issues, existing technologies urgently need improvement. Summary of the Invention

[0005] In order to solve the above problems, the purpose of this utility model is to provide a centrifugal fan and its volute, which has the advantages of reducing noise, stabilizing airflow and increasing wind pressure.

[0006] This application provides a volute housing, the technical solution of which is as follows: the volute housing has a volute cavity for mounting a centrifugal impeller inside, an air inlet is provided on the axial side of the volute housing, and an air outlet is provided on the circumferential side of the volute housing; the volute housing also has an air duct from the volute cavity to the air outlet; the upper and lower side walls of the air outlet of the volute housing form a diffuser-shaped air duct that expands in the outlet direction; multiple protrusions are arranged in an array on the inner side wall of the upper side wall of the air outlet, and multiple concave points are arranged in an array on the inner side wall of the lower side wall.

[0007] Furthermore, this application also proposes that the convex point is constructed as a semi-circular convex point and the concave point is constructed as a semi-circular concave point.

[0008] Furthermore, this application also proposes that the inner end corner of the diffuser-shaped air duct inside the upper sidewall is constructed as an arc corner, and multiple protrusions are arrayed on the arc corner.

[0009] Furthermore, this application also proposes that the lower edge sidewall of the diffuser-shaped air duct is constructed as a plane near the air outlet, and multiple concave points are arrayed on the plane of the lower edge sidewall.

[0010] Furthermore, this application also proposes that arc-shaped baffles are provided on the plane of the lower edge sidewalls on both sides of the plurality of concave points, and the distance between the two arc-shaped baffles gradually increases from the inside to the outside along the diffuser-shaped air duct.

[0011] Furthermore, this application also proposes that the edges of the multiple concave points arranged in the array are arranged in an arc shape that matches the shape of the arc-shaped baffle.

[0012] Furthermore, this application also proposes that the volute includes a detachable and dockably fixed upper shell and a lower shell; the upper shell includes an upper enclosure plate and upper side plates on both sides; the end of the upper enclosure plate is the upper edge sidewall of the air outlet; the lower shell includes a lower enclosure plate and lower side plates on both sides; the end of the lower enclosure plate includes the lower edge sidewall of the air outlet, and the end of the lower side plate is the sidewall that constitutes a diffuser-shaped air duct.

[0013] Furthermore, this application also proposes that the upper half shell and the lower half shell are respectively provided with positioning protrusions and positioning posts on both sides of the air inlet, and positioning grooves are constructed on the positioning protrusions; when the upper half shell and the lower half shell are docked, the positioning posts are embedded in the positioning grooves of the positioning protrusions to achieve preliminary positioning.

[0014] Furthermore, this application also proposes that the upper half shell has cards on both sides of the front end of the upper part of the upper plate and a hook and a first connecting seat on the rear end; the lower half shell has a card seat and a second connecting seat on the rear side of the lower plate; when the upper half shell and the lower half shell are connected, the cards of the upper half shell are engaged with the lower side plate of the lower half shell, the hooks are engaged with the card seats, and the first connecting seat and the second connecting seat are connected by screw fasteners.

[0015] Furthermore, this application also proposes a centrifugal fan, including a volute and an impeller inside the volute; the volute is the aforementioned type.

[0016] As described above, the volute and centrifugal fan provided in this application include a volute housing with a volute cavity for mounting a centrifugal impeller, an air inlet on the axial side of the volute housing, and an air outlet on the circumferential side of the volute housing. The volute housing also contains an air duct connecting the volute cavity to the air outlet. A diffuser-shaped air duct expanding in the outlet direction is formed between the upper and lower sidewalls of the air outlet. Multiple protrusions are arranged in an array on the inner wall of the upper sidewall of the air outlet, and multiple concave points are arranged in an array on the inner wall of the lower sidewall. By providing protrusions and concave points on the inner walls of the upper and lower sidewalls of the air outlet, the airflow pattern can be effectively changed, noise reduced, airflow stabilized, and air pressure increased, thus offering advantages such as noise reduction, airflow stabilization, and increased air pressure. Attached Figure Description

[0017] Figure 1 A three-dimensional schematic diagram of a volute provided in this application Figure 1 .

[0018] Figure 2 A three-dimensional schematic diagram of a volute provided in this application Figure 2 .

[0019] Figure 3 A three-dimensional schematic diagram of a volute provided in this application Figure 3 .

[0020] Figure 4 An exploded view of the structure of a volute provided in this application.

[0021] Figure 5 This is a schematic diagram of the internal structure of the upper shell.

[0022] Figure 6 A schematic diagram of a centrifugal fan provided for this application. DETAILED DESCRIPTION

[0023] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0024] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and 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. Therefore, they should not be construed as limitations on this utility model.

[0025] 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 one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more, unless otherwise expressly defined.

[0026] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0027] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0028] Example 1:

[0029] like Figures 1-5As shown, this embodiment relates to a volute housing. The volute housing 1 has a volute cavity 10 for mounting a centrifugal impeller inside. An air inlet 11 is provided on the axial side of the volute housing 1, and an air outlet 12 is provided on the circumferential side of the volute housing 1. The volute housing 1 also has an air duct from the volute cavity 10 to the air outlet 12. The upper sidewall 14 and the lower sidewall 15 of the air outlet 12 of the volute housing 1 form a diffuser-shaped air duct 13 that expands in the outlet direction. Multiple protrusions 161 are arranged in an array on the inner sidewall of the upper sidewall 14 of the air outlet 12, and multiple concave points 162 are arranged in an array on the inner sidewall of the lower sidewall 15.

[0030] In the above-described scheme, the design of the diffuser-shaped air duct 13 effectively reduces airflow velocity and noise. Specifically, the distance between the upper sidewall 14 and the lower sidewall 15 of the diffuser-shaped air duct 13 gradually increases along the outlet direction, causing the airflow velocity to gradually decrease as it passes through the duct, thereby reducing airflow impact and noise. Furthermore, the array of multiple protrusions 161 on the inner sidewall of the upper sidewall 14 and the array of multiple concave points 162 on the inner sidewall of the lower sidewall 15 further improves airflow distribution and reduces airflow disturbance. This technical solution, through the combination of the diffuser-shaped air duct 13 and the protrusions 161 and concave points 162, effectively solves the technical problems of unstable airflow and high noise at the outlet 12 of the volute 1. Compared with the prior art, the technical solution of this application significantly improves airflow stability and reduces noise levels by optimizing the duct structure and airflow guidance method, thereby improving the overall performance of the volute 1.

[0031] Furthermore, this application proposes that the protrusion 161 is constructed as a semi-circular protrusion, and the concave point 162 is constructed as a semi-circular concave point. Specifically, the semi-circular protrusion refers to a semi-circular protrusion structure provided on the inner wall surface of the upper edge sidewall 14 of the air outlet 12 of the volute 1, and the semi-circular concave point is a semi-circular recessed structure provided on the inner wall surface of the lower edge sidewall 15. Specifically, the design of the semi-circular protrusion and concave point 162 can be achieved through machining, injection molding, or 3D printing. As a preferred embodiment, the diameter and height of the semi-circular protrusion and concave point 162 can be adjusted according to the specific airflow requirements to ensure optimal improvement of the airflow state at the air outlet 12. By providing a semi-circular protrusion on the inner wall surface of the upper edge sidewall 14 of the air outlet 12 of the volute 1 and a semi-circular concave point on the inner wall surface of the lower edge sidewall 15, the airflow state at the air outlet 12 can be effectively improved. The design of the semi-circular protrusions and concave points 162 reduces turbulence and separation of airflow at the wall surface, thereby improving airflow stability and uniformity. This structural design helps reduce noise and improve the overall performance of the fan. Compared with existing technologies, the technical solution of this application significantly improves airflow stability and fan operating efficiency through simple structural improvements, demonstrating high practicality and innovation.

[0032] Furthermore, this application proposes that the inner corner of the diffuser-shaped air duct 13 inside the upper sidewall 14 is constructed as an arc-shaped corner 163, and multiple protrusions 161 are arrayed on the arc-shaped corner 163. The design of the arc-shaped corner 163 reduces turbulence and resistance at the corner, thereby reducing noise and improving airflow stability. Specifically, the radius of curvature of the arc-shaped corner 163 can be optimized according to the actual air duct size and airflow velocity to achieve the best airflow guidance effect. As a preferred embodiment, the radius of curvature of the arc-shaped corner 163 can be set between 1 / 3 and 1 / 2 of the air duct width to balance airflow stability and air duct structural strength. The array of multiple protrusions 161 on the arc-shaped corner 163 further optimizes the airflow path and reduces airflow separation. The shape and size of the protrusions 161 can be adjusted according to specific application scenarios; for example, the protrusions 161 can be designed as semi-circular, elliptical, or other streamlined shapes to minimize airflow resistance. Specifically, the height of the protrusions 161 can be set to between 1 / 10 and 1 / 5 of the height of the air duct, and the spacing between the protrusions 161 can be set to 1.5 to 2 times the diameter of the protrusions 161, so as to ensure that the airflow can pass smoothly through the array of protrusions 161.

[0033] Therefore, this application effectively solves the problems of unstable airflow and high noise at the inner corner of the diffuser-shaped air duct 13 along the side wall 14 of the air outlet 12 by combining the arc angle 163 and the convex points 161. Compared with the prior art, the technical solution of this application not only significantly reduces airflow noise in the air duct, but also improves airflow stability, thereby enhancing the overall performance of the air duct. Specifically, the design of the arc angle 163 reduces airflow turbulence at the corner, while the array of convex points 161 further optimizes the airflow path, reduces airflow separation, and allows the airflow to pass through the air duct more smoothly. This design shows good results in practical applications, especially in situations requiring low noise and high airflow stability, such as centrifugal fans in air conditioning systems, where it has significant advantages.

[0034] Furthermore, this application proposes that the lower edge sidewall 15 of the diffuser duct 13 is constructed as a plane near the air outlet 12, and multiple concave points 162 are arrayed on the plane of the lower edge sidewall 15. The planar design helps reduce airflow turbulence near the air outlet 12 and improves airflow stability. The array of concave points 162 on the plane further guides the airflow, reduces airflow separation, thereby enhancing the overall performance of the duct and ensuring more uniform and stable airflow at the air outlet 12. Specifically, the planar design can be achieved by processing the inner wall surface of the lower edge sidewall 15 into a flat surface, avoiding airflow turbulence caused by curved surfaces or complex structures. The arrangement of the concave points 162 can adopt semi-circular concave points, whose shape and size can be optimized according to airflow characteristics to ensure that the airflow is effectively guided when passing through the concave points 162. Furthermore, the array arrangement of the concave points 162 can be either evenly spaced or unequally spaced. The specific spacing can be adjusted according to the size of the duct and the airflow velocity to achieve optimal airflow control. As a preferred embodiment, the depth and diameter of the concave points 162 can be designed according to the size of the duct and the airflow velocity to ensure that the airflow is effectively guided when passing through the concave points 162, reducing airflow separation. Further, the arrangement of the concave points 162 can be combined with the design of arc-shaped baffles. The arc-shaped baffles can be set on the planes on both sides of the concave points 162, with the spacing between the two arc-shaped baffles gradually increasing from the inside to the outside along the diffuser duct 13 to further guide the airflow and reduce airflow separation. Thus, the technical solution of this application effectively solves the problem of airflow instability near the air outlet 12 by constructing the lower edge sidewall 15 of the diffuser duct 13 as a plane near the air outlet 12 and arranging multiple concave points 162 in an array on the plane. The planar design reduces airflow turbulence, while the arrangement of the concave points 162 further guides the airflow and reduces airflow separation, thereby improving the stability and uniformity of the airflow. Compared with the prior art, the technical solution of this application not only improves the airflow stability, but also enhances the overall performance of the air duct, ensuring that the airflow is more uniform and stable at the air outlet 12.

[0035] Furthermore, arc-shaped baffles 164 are installed on the lower edge sidewall 15 of the diffuser duct 13, with the distance between the two arc-shaped baffles 164 gradually increasing from the inside to the outside of the duct. The arc-shaped baffles 164 effectively guide airflow, reducing turbulence and eddies within the duct, thereby reducing harmonic noise and improving airflow stability. The arc-shaped baffles 164 allow for smoother airflow diffusion as it passes through the duct, preventing sudden expansion at the outlet and further reducing noise generation. Specifically, the arc-shaped baffles 164 can be semi-circular, elliptical, or other suitable arc shapes, and their material can be metal, plastic, or other materials with sufficient strength and durability. The arc-shaped baffles 164 can be installed by welding, bolting, or snap-fit ​​connections to ensure their stability within the duct. The gradually increasing distance between the arc-shaped baffles 164 can be achieved by adjusting the installation angle of the baffles or using baffles of different lengths. Furthermore, the surface of the arc-shaped baffle 164 can be further processed into a smooth or slightly textured structure to further optimize the airflow characteristics. Thus, this technical solution, by setting the arc-shaped baffles 164 and adjusting their spacing, can effectively improve the problems of unstable airflow and high noise during centrifugal fan operation. Compared with existing technologies, this solution reduces airflow turbulence and eddies by optimizing the airflow path within the duct, thereby significantly reducing noise levels and improving airflow stability. The arc-shaped baffles 164 allow the airflow to diffuse more smoothly as it passes through the duct, avoiding sudden expansion at the outlet and further reducing noise generation. This design not only improves the operating efficiency of the centrifugal fan but also extends the service life of the equipment, offering significant technical advantages. Furthermore, this application proposes that the edges of the arrayed concave points 162 are arranged in an arc shape adapted to the shape of the arc-shaped baffles 164. The shape of the arc-shaped baffles 164 matches the arc design of the edges of the concave points 162, allowing the airflow to flow more smoothly as it passes through the diffuser duct 13. Specifically, the arc-shaped design of the two sides of the concave point 162 reduces the friction and impact between the airflow and the duct wall, thereby reducing noise and improving airflow stability. As a preferred embodiment, the arc shape of the two sides of the concave point 162 can be achieved through molding or machining to ensure a perfect fit with the shape of the arc-shaped baffle 164. Thus, this technical solution optimizes the airflow path, reduces energy loss, and thereby increases air pressure. Compared with existing technologies, the design of this application effectively solves the technical problems of high noise, unstable airflow, and reduced air pressure during centrifugal fan operation. Specifically, by arranging the two sides of the concave point 162 into an arc shape that matches the shape of the arc-shaped baffle 164, the airflow can flow more smoothly when passing through the diffuser duct 13, reducing the friction and impact between the airflow and the duct wall, thereby reducing noise and improving airflow stability.In addition, the design reduces energy loss by optimizing the airflow path, thereby increasing wind pressure.

[0036] like Figure 4 and 5 As shown, this application also proposes that the volute 1 includes a detachably docked upper shell 101 and a lower shell 102; the upper shell 101 includes an upper surrounding plate 103 and upper side plates 104 on both sides; the end of the upper surrounding plate 103 is the upper edge sidewall 14 of the air outlet 12; the lower shell 102 includes a lower surrounding plate 105 and lower side plates 106 on both sides; the end of the lower surrounding plate 105 includes the lower edge sidewall 15 of the air outlet 12, and the end of the lower side plate 106 is the sidewall forming the diffuser-shaped air duct 13. Specifically, the upper shell 101 and the lower shell 102 are fixed by a detachable docking method, which makes the installation process of the volute 1 simpler. In this design, the upper enclosure plate 103 and upper side plate 104 of the upper shell 101 form the upper sidewall 14 of the air outlet 12, and the lower enclosure plate 105 and lower side plate 106 of the lower shell 102 form the lower sidewall 15 of the air outlet 12. The end of the lower side plate 106 also forms the sidewall of the diffuser duct 13. This split design not only simplifies the manufacturing and installation process but also facilitates subsequent maintenance and replacement. For example, the upper shell 101 and lower shell 102 can be initially positioned using positioning protrusions and positioning posts, and then fixed using clips, hooks, and connecting seats to ensure accurate and stable docking. Therefore, this technical solution effectively solves the technical problems of complex structure and inconvenient installation of the volute 1 by dividing the volute 1 into an upper shell 101 and a lower shell 102 and fixing them through a detachable docking method. Compared with existing technologies, this split design not only simplifies the installation process but also improves the maintenance convenience of the volute 1, making the overall structure more flexible and efficient.

[0037] Specifically, positioning protrusions 107 and positioning posts 108 are respectively provided on both sides of the air inlet 11 of the upper half shell 101 and the lower half shell 102 of the volute 1, and positioning grooves are constructed on the positioning protrusions 107. When the upper half shell 101 and the lower half shell 102 are docked, the positioning post 108 is embedded in the positioning groove of the positioning protrusion 107, thereby achieving initial positioning. The positioning protrusions 107 and positioning posts 108 can be set in various forms. For example, the positioning protrusions 107 can be designed as rectangular, trapezoidal or other geometric shapes, and the positioning grooves can be adapted to the shape of the positioning posts 108 to ensure that the positioning posts 108 can be accurately embedded. The positioning posts 108 can be cylindrical, square or other cross-sectional shapes, and their length and diameter can be adjusted according to actual assembly requirements. In addition, the materials of the positioning protrusions 107 and positioning posts 108 can be the same as those of the volute 1, such as plastic or metal, to ensure their strength and durability. In a preferred embodiment, the positioning protrusions 107 and positioning posts 108 can be integrally formed with the upper shell 101 and lower shell 102 by injection molding or machining to improve assembly accuracy and structural stability. Therefore, this technical solution, by setting positioning protrusions 107 and positioning posts 108 on both sides of the air inlet 11 of the upper shell 101 and lower shell 102, and constructing positioning grooves on the positioning protrusions 107, allows the upper shell 101 and lower shell 102 to achieve initial positioning during docking. This design ensures the accuracy and stability of the upper shell 101 and lower shell 102 during docking, avoiding assembly problems caused by inaccurate positioning. Compared with the prior art, this technical solution simplifies the assembly process of the volute 1, improves production efficiency, and also ensures the structural stability and reliability of the volute 1 during use.

[0038] Furthermore, the upper half shell 101 has clips 109 on both sides of the front end of the upper plate 103, and a hook 110 and a first connecting seat 111 on the rear end; the lower half shell 102 has a locking seat 112 and a second connecting seat 113 on the rear side of the lower plate 105; when the upper half shell 101 and the lower half shell 102 are joined, the clips 109 of the upper half shell 101 are engaged with the lower side plate 106 of the lower half shell 102, the hook 110 is engaged with the locking seat 112, and the first connecting seat 111 and the second connecting seat 113 are connected by screws. Specifically, the clips 109 can be designed as a metal or plastic sheet with a certain degree of elasticity, and their shape can be L-shaped or T-shaped to facilitate engagement with the lower side plate 106 of the lower half shell 102. The hook 110 can be designed with a barb structure to ensure a firm connection with the locking seat 112. The first connecting seat 111 and the second connecting seat 113 can be fixed by bolts, screws, or other threaded components to provide additional connection strength. As a preferred embodiment, the surfaces of the card 109 and the hook 110 can be coated with an anti-slip material to increase friction and further improve the stability of the connection. Thus, this technical solution achieves precise positioning and a stable connection between the upper shell 101 and the lower shell 102 through the cooperation of the card 109, the hook 110, and the connecting seats. The engagement of the card 109 with the lower side plate 106 ensures the accuracy of the initial positioning, the engagement of the hook 110 with the seat 112 further enhances the stability of the connection, and the fixing of the connecting seats by threaded components provides additional support. The synergy of these technical features effectively solves the technical problems of inaccurate positioning and unstable connection when the upper shell 101 and the lower shell 102 of the volute 1 are docked. Compared with the prior art, this solution not only improves the docking accuracy but also significantly enhances the reliability of the connection, thereby improving the overall performance of the volute 1.

[0039] Example 2:

[0040] like Figure 6As shown, this embodiment also proposes a centrifugal fan, including a volute 1 and an impeller 2 inside the volute 1, wherein the volute 1 adopts the specific design in Embodiment 1. The volute 1 has a volute cavity 10 for mounting the centrifugal impeller inside, an air inlet 11 on its axial side, and an air outlet 12 on its circumferential side. An air duct from the volute cavity 10 to the air outlet 12 is also constructed inside the volute 1, and a diffuser-shaped air duct 13 expanding in the outlet direction is formed between the upper sidewall 14 and the lower sidewall 15 of the air outlet 12. Multiple protrusions 161 are arranged in an array on the inner wall surface of the upper sidewall 14 of the air outlet 12, and multiple concave points 162 are arranged in an array on the inner wall surface of the lower sidewall 15. Specifically, the impeller 2 of the centrifugal fan is installed inside the volute cavity 10 of the volute 1. Utilizing the array of protrusions 161 and concave points 162 within the volute 1, and the design of the diffuser-shaped air duct 13, the airflow path is optimized, reducing turbulence and noise within the volute 1. Simultaneously, the detachable design of the volute 1 facilitates maintenance and cleaning, further improving the fan's operating efficiency and stability. In this way, the centrifugal fan can effectively reduce noise, stabilize airflow, and maintain high air pressure during operation. Therefore, the technical solution of this application, through a specific volute 1 design, solves the technical problems of high noise, unstable airflow, and reduced air pressure during centrifugal fan operation. Compared with existing technologies, this solution significantly reduces noise by optimizing the airflow path and reducing turbulence, while the detachable design improves maintenance convenience and operational stability, thereby achieving more efficient fan operation.

[0041] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. 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.

[0042] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention.

Claims

1. A volute, wherein the volute (1) has an internal volute cavity (10) for mounting a centrifugal impeller, an air inlet (11) is provided on the axial side of the volute (1), and an air outlet (12) is provided on the circumferential side of the volute (1); the volute (1) also has an internal air duct from the volute cavity (10) to the air outlet (12); the upper edge sidewall (14) and the lower edge sidewall (15) of the air outlet (12) of the volute (1) form a diffuser-shaped air duct (13) that expands in the outlet direction; characterized in that: The upper sidewall (14) of the air outlet (12) has a plurality of protrusions (161) arranged in an array on the inner sidewall surface, and the lower sidewall (15) has a plurality of concave points (162) arranged in an array on the inner sidewall surface.

2. A volute according to claim 1, characterized in that: The protrusion (161) is constructed as a semi-circular protrusion, and the concave point (162) is constructed as a semi-circular concave point.

3. A volute according to claim 1, characterized in that: The inner corner of the diffuser-shaped air duct (13) inside the upper sidewall (14) is constructed as an arc corner (163), and multiple protrusions (161) are arranged in an array on the arc corner (163).

4. A volute according to claim 1, characterized in that: The lower edge sidewall (15) of the diffuser duct (13) is constructed as a plane near the air outlet (12), and multiple recesses (162) are arranged in an array on the plane of the lower edge sidewall (15).

5. A volute according to claim 4, characterized in that: Arc-shaped baffles (164) are also provided on the plane of the lower edge sidewalls (15) on both sides of the plurality of concave points (162), and the distance between the two arc-shaped baffles (164) gradually increases from the inside to the outside along the diffuser-shaped air duct (13).

6. A volute according to claim 5, characterized in that: The edges of the multiple concave points (162) arranged in the array are arranged in an arc shape that matches the shape of the arc-shaped baffle (164).

7. A volute according to any one of claims 1 to 6, characterized in that: The volute (1) includes a detachable and dockable upper shell (101) and a lower shell (102); the upper shell (101) includes an upper enclosure plate (103) and upper side plates (104) on both sides; the end of the upper enclosure plate (103) is the upper edge sidewall (14) of the air outlet (12); the lower shell (102) includes a lower enclosure plate (105) and lower side plates (106) on both sides; the end of the lower enclosure plate (105) includes the lower edge sidewall (15) of the air outlet (12), and the end of the lower side plate (106) is the sidewall that forms the diffuser-shaped air duct (13).

8. A volute according to claim 7, characterized in that: The upper shell (101) and the lower shell (102) are respectively provided with positioning protrusions (107) and positioning posts (108) on both sides of the air inlet (11). Positioning protrusions (107) are provided with positioning grooves. When the upper shell (101) and the lower shell (102) are connected, the positioning posts (108) are embedded in the positioning grooves of the positioning protrusions (107) to achieve preliminary positioning.

9. A volute according to claim 7, characterized in that: The upper half shell (101) has card (109) on both sides of the front end of the upper plate (103) and a hook (110) and a first connecting seat (111) on the rear end; the lower half shell (102) has a card seat (112) and a second connecting seat (113) on the rear side of the lower plate (105); when the upper half shell (101) and the lower half shell (102) are connected, the card (109) of the upper half shell (101) is engaged on the lower side plate (106) of the lower half shell (102), the hook (110) is engaged on the card seat (112), and the first connecting seat (111) and the second connecting seat (113) are connected by a screw fastener.

10. A centrifugal fan, comprising a volute (1) and an impeller (2) inside the volute (1); characterized in that: The volute (1) is the volute (1) according to any one of claims 1 to 9.

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