Multi-wing centrifugal fan impeller with arc-shaped front disc and multi-wing centrifugal fan

Abstract

The invention relates to the field of centrifugal fan industry, in particular to a multi-wing centrifugal fan impeller with an arc-shaped front disc and a multi-wing centrifugal fan, the impeller comprises the front disc and a rear disc, an exhaust inlet is formed in the middle of the front disc, and a plurality of blades are arranged on the rear disc in a surrounding array mode; the front disc is of an arc-shaped structure, the front disc comprises a front disc linear part and a front disc arc part which are connected in the direction from the air suction opening to the rear disc, and an impeller clearance fit part is arranged at the end, away from the front disc arc part, of the front disc linear part and used for connecting the impeller and the current collector. According to the multi-wing centrifugal fan impeller with the arc-shaped front disc and the multi-wing centrifugal fan, the blades on the two sides are asymmetrically designed, the contact ends of the blades and the rear disc are straight and perpendicular, the contact ends of the blades and the front disc are in arc curvature transition, and when air flow enters the impeller, the air flow can flow in the arc direction of the blades, so that a vortex area and an impact area are reduced; the fan pressure and efficiency of the multi-wing centrifugal fan are effectively improved, and fan noise generated by rotation impact when airflow enters is reduced.

Description

Technical Field

[0001] The present invention relates to the field of centrifugal fans, and particularly relates to a multi-wing centrifugal fan impeller with an arc-shaped front disc and a multi-wing centrifugal fan. Background Art

[0002] The multi-wing centrifugal fan is a type of centrifugal fan, and the impeller used is a multi-wing blade. The front disc is generally designed with a flat structure. The multi-wing centrifugal fan is widely used in the fields of ventilation, air conditioning, household appliances, etc. due to its characteristics of high air volume, low noise, and compact structure. Currently, the existing multi-wing centrifugal fans generally have problems such as insufficient total pressure, low efficiency, and high noise, and it is difficult to meet the requirements of society and users.

[0003] Therefore, the performance of the existing multi-wing centrifugal fans needs to be further improved. Summary of the Invention

[0004] The purpose of the present invention is to provide a multi-wing centrifugal fan impeller with an arc-shaped front disc and a multi-wing centrifugal fan, aiming to solve the problems such as insufficient total pressure, low efficiency, and high noise commonly existing in the existing multi-wing centrifugal fans.

[0005] To achieve the above purpose, according to the first aspect of the present invention, a multi-wing centrifugal fan impeller with an arc-shaped front disc, the impeller includes a front disc and a rear disc. An air suction port is provided in the middle of the front disc, and a plurality of blades are arranged in a circumferential array on the rear disc; The front disc is set as an arc-shaped structure. From the air suction port towards the rear disc, the front disc includes a connected front disc straight part and a front disc arc part. At one end of the front disc straight part far from the front disc arc part, an impeller clearance fit part is provided, and the impeller clearance fit part is used to connect the impeller with the air collector.

[0006] Further, the length L3 of the front disc straight part is 10 mm - 10.2 mm, the radius R2 of the front disc arc part is 53 mm - 55 mm and the arc length is 79 mm - 82 mm. The thickness L4 of the front disc arc part and the front disc straight part is equal and is 3 mm; From the air suction port towards the rear disc, the vertical distance L2 between the two ends of the front disc arc part is 54.3 mm - 54.5 mm; Taking the plane passing through the central axis of the impeller to intercept the impeller, on the cross-section, the impeller clearance fit part forms an inverted L-shaped structure. The height L5 of the impeller clearance fit part is 1.9 mm - 2.1 mm, and the width L6 of the impeller clearance fit part is 4.5 mm - 5.5 mm.

[0007] Further, the blade includes a leading edge and a trailing edge, a first side connecting between the first ends of the leading edge and the trailing edge, and a second side connecting between the second ends of the leading edge and the trailing edge. The first side is the side close to the air suction port, the second side is the side far from the air suction port, and both the leading edge and the trailing edge are perpendicular to the rear disc; When the blade is installed, the inlet angle ∠1 is 109.3° - 111.3°, and the outlet angle ∠2 is 164° - 166°. On the projection plane of the rear disc, the radius R1 of the blade is 39 mm - 41.5 mm and the arc length is 66.7 mm - 71 mm; The diameter φ1 of the impeller is 570 mm, the diameter φ2 of the outer peripheral circle formed by the outer ends of all blades is 564 mm - 565 mm, the diameter φ3 of the inner peripheral circle formed by the inner ends of all blades is 458.6 mm - 459.5 mm, and the width L1 of the trailing edge is 187.5 mm - 188.5 mm; The diameter φ4 of the air suction port is 451.6 mm - 452.4 mm; The number of blades is 42.

[0008] Further, φ2 is 564.6 mm, φ3 is 459.1 mm, φ4 is 452 mm, R1 is 40 mm and the arc length is 69.3 mm, R2 is 54 mm and the arc length is 80.5 mm, ∠1 is 110.3°, ∠2 is 165°, L1 is 188 mm, L2 is 54.4 mm, L3 is 10.1 mm, L5 is 2 mm, L6 is 5 mm.

[0009] According to the second aspect of the present invention, a multi-wing centrifugal fan includes a volute and a collector fixedly arranged in the volute, and further includes the above-mentioned impeller. The impeller is arranged in the volute, and the impeller is connected to the collector through an impeller clearance fitting part.

[0010] Further, the collector includes a connecting part, a wind guiding part, an air inlet, an air guiding port and a rectifying anti-vortex ring. The collector is fixedly connected to the volute through the connecting part. The connecting part is in a circular ring shape and an air inlet is formed in its inner circumference. The outlet of the wind guiding part forms an air guiding port. One end of the rectifying anti-vortex ring is fixedly connected to the connecting part, and the other end of the rectifying anti-vortex ring is fixedly connected to the wind guiding part; Taking the plane passing through the central axis of the collector to intercept the collector, on the cross-section and in the direction from the air inlet to the air guiding port, the wind guiding part includes a connected wind guiding part arc section and a wind guiding part straight section. An air collector clearance fitting part is arranged at one end of the wind guiding part straight section far from the wind guiding part arc section, and the air collector clearance fitting part is matched with the impeller clearance fitting part; The diameter φ5 of the air inlet is 564.5 mm - 567.5 mm. The diameter of the wind guiding part gradually decreases first and then remains unchanged in the direction away from the air inlet. The radius R3 of the wind guiding part arc section is 53 mm - 55 mm and the arc length is 83 mm - 86.5 mm. The length L7 of the wind guiding part straight section is 23.5 mm - 24.5 mm. The diameter φ6 of the air guiding port is 451.6 mm - 452.4 mm. The diameter φ5 of the air inlet is 564.5 mm - 567.5 mm. The vertical distance L17 between the air inlet and the air guiding port is 80 mm - 82 mm.

[0011] Further, the collector is intercepted by a plane passing through the central axis of the collector. On the cross-section, the collector clearance fit portion forms an inverted L-shaped structure. The height L9 of the collector clearance fit portion is 1.4 mm - 1.6 mm, the width L10 of the collector clearance fit portion is 9.5 mm - 10.5 mm, and the thicknesses L8 of the arc segment and the straight segment of the air guiding portion are equal and are 3 mm.

[0012] Further, the profile line of the volute includes a first diffuser straight segment, a volute tongue segment, a first arc segment, a second arc segment, a third arc segment, a fourth arc segment, and a second diffuser straight segment that are successively tangent to each other; the first diffuser straight segment and the second diffuser straight segment enclose an air outlet, and the first arc segment, the second arc segment, the third arc segment, and the fourth arc segment are not concentric. Taking the center of the impeller as the origin of the coordinate system to establish a rectangular coordinate system. When the first diffuser straight segment is in the second quadrant, the coordinates of the center O1 of the first arc segment are (39.2, 39.2), the radius R5 is 318 mm - 320.5 mm, and the arc length is 159 mm - 161 mm; the coordinates of the center O4 of the second arc segment are (39.2, -39.2), the radius R6 is 396 mm - 399 mm, and the arc length is 622 mm - 627 mm; the coordinates of the center O3 of the third arc segment are (-39.2, -39.2), the radius R7 is 474 mm - 478 mm, and the arc length is 745 mm - 750 mm; the coordinates of the center O2 of the fourth arc segment are (-39.2, 39.2), the radius R8 is 552 mm - 557 mm, and the arc length is 867 mm - 875 mm. The second diffuser straight segment is perpendicular to the air outlet, and the first diffuser straight segment is inclined along the air outlet.

[0013] Further, the width L12 of the air outlet is 624 mm - 626 mm, and the height L13 is 354 mm - 356 mm. The radius R4 of the volute tongue segment is 27.6 mm - 28.4 mm, and the arc length is 91 mm - 93 mm. The length L11 of the first diffuser straight segment is 182 mm - 184 mm, and the length L18 of the second diffuser straight segment is 394.5 mm - 397 mm. Taking the tangent point of the volute tongue segment and the first arc segment as the tangent point to make a tangent to the volute tongue segment, the included angle ∠3 between this tangent and the first diffuser straight segment is 8.4° - 8.6°, and the narrowest width L16 between the second diffuser straight segment and the volute tongue segment is 437 mm - 439 mm. The width L14 of the volute is 1088 mm - 1092 mm, and the height L15 of the volute is 969 mm - 971 mm.

[0014] Furthermore, it also includes an air inlet flange, a motor and a machine base. The air inlet flange is fixedly arranged on the volute, the motor is connected to the impeller through the motor shaft, and the volute and the motor are fixedly arranged on the machine base; the air inlet flange is in a circular ring shape and the inner diameter φ7 is 568mm-572mm.

[0015] The present invention provides a multi-blade centrifugal fan impeller with an arc-shaped front disk and a multi-blade centrifugal fan: (1) The front disc of the impeller used in the multi-blade centrifugal fan adopts an arc-shaped design, which is different from the conventional straight front disc design. The blades on both sides are designed asymmetrically. The contact end of the blade and the rear disc is straight and vertical, and the contact end with the front disc has an arc curvature transition. The front end of the blade is designed to be arc-shaped to match the arc of the front disc. The arc curvature of the front disc and the blade inlet is optimized. When the airflow enters the impeller, it can flow along the blade arc, thereby reducing the vortex area and impact area, effectively improving the fan pressure and efficiency of the multi-blade centrifugal fan, and reducing the fan noise generated by the swirling impact when the airflow enters; (2) The air guide arc section and the front disk arc section designed with the same radius, and the impeller clearance fitting part and the collector clearance fitting part designed in an inverted L shape are matched to make the air guide port of the collector smooth and straight, without misalignment and seamlessly connected to the air inlet of the arc-shaped front disk of the impeller. The collector and the impeller front disk are clearance-matched in the axial and radial directions respectively, without the need to divide the space distance and segment, which reduces the friction of the air duct and realizes better installation and matching between the impeller and the collector through the impeller clearance fitting part and the collector clearance fitting part; by designing a rectifying anti-vortex ring, the generation of vortex in the fan can be effectively prevented, thereby improving the efficiency of the fan. At the same time, the strength of the air inlet is improved to make it less likely to deform, making the air duct smoother; (3) The logarithmic spiral volute arc transition ensures smooth and efficient airflow in the volute; by changing the curvature of the fan volute tongue and its longitudinal offset, the volute tongue is designed to be a sharp and deep structure, which can reduce the backflow area and effectively reduce noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the multi-blade centrifugal fan of the present invention; Figure 2 Schematic diagram of the volute profile; Figure 3 Schematic diagram of the top view of the volute; Figure 4 Schematic diagram of the three-dimensional structure of the volute; Figure 5 is a schematic diagram of the structure of the impeller; Figure 6 is a schematic diagram of a side cross-sectional structure of an impeller; Figure 7 for Figure 6 A partial enlarged view of the middle A; Figure 8 Schematic three-dimensional structure diagram of the impeller; Figure 9 Side view cross-sectional view of the collector; Figure 10 is Figure 9 Partial enlarged view at position B in Figure 11 Performance curve of the multi-wing centrifugal fan of the present invention; Figure 12 Performance curve of the comparative example.

[0017] Explanation of reference numerals in the drawings: Volute 1; First diffuser straight section 11; Volute tongue section 12; First arc section 13; Second arc section 14; Third arc section 15; Fourth arc section 16; Second diffuser straight section 17; Air outlet 18; Impeller 2; Blade 21; Leading edge 211; Trailing edge 212; Front disc 22; Front disc circular arc part 221; Front disc straight part 222; Impeller clearance fit part 223; Rear disc 23; Suction port 24; Collector 3; Connecting part 31; Air guiding part 32; Air guiding part circular arc section 321; Air guiding part straight section 322; Collector clearance fit part 323; Air inlet 33; Air guiding port 34; Rectifying anti-vortex ring 35; Air inlet flange 4; Motor 5; Machine base 6. Detailed description of the specific implementation mode

[0018] The present invention will be described in detail below in conjunction with specific embodiments.

[0019] In the present invention, unless otherwise clearly defined and limited, when terms such as "arranged on", "connected", "connected" appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection or an integral connection; it can be directly connected or connected through one or more intermediate media. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations. For the direction words in the present invention, it is to better explain the characteristics of the features and the relationship between the features. It should be understood that when the placement direction of the present invention changes, the direction of the characteristics of the features and the relationship between the features also changes accordingly. Therefore, the direction words do not constitute an absolute limitation on the characteristics of the features and the relationship between the features in space, but only play a relative limiting role.

[0020] The structural parameters adopted by the present invention are only for explaining the technical solution of the present invention, that is, based on the basic structural parameters of the present invention, reasonable proportional scaling can be carried out during actual production (for example, when the diameter of the impeller is 570 mm, it can be scaled 0.1 - 30 times, etc.). This reasonable proportional scaling also falls within the protection scope of the present invention.

[0021] Please refer to Figure 1-12 , according to the first aspect of the present invention, a multi-wing centrifugal fan impeller with an arc-shaped front disc, the impeller 2 includes a front disc 22 and a rear disc 23. An air suction port 24 is provided in the middle of the front disc 22, and a plurality of blades 21 are arranged in a circular array on the rear disc 23; the front disc 22 is arranged as an arc-shaped structure. From the air suction port 24 to the direction of the rear disc 23, the front disc 22 includes a connected front disc straight portion 222 and a front disc arc portion 221. One end of the front disc straight portion 222 far from the front disc arc portion 221 is provided with an impeller clearance fit portion 223, and the impeller clearance fit portion 223 is used to connect the impeller 2 with the air collector 3.

[0022] Through the above technical solution, the front disc 22 of the impeller for a multi-wing centrifugal fan is designed with an arc shape, which is different from the conventional straight front disc design. The two-side blades 21 are asymmetrically designed. The contact end of the blade 21 with the rear disc 23 is straight and perpendicular, and the contact end with the front disc 22 has an arc curvature transition. The front end of the blade 21 is designed as an arc that coincides with the arc of the front disc 22. The arc curvature of the inlet of the front disc 22 and the blade 21 is optimized. When the air flow enters the impeller 2, it can flow along the arc of the blade 21, thereby reducing the eddy current area and the impact area, effectively improving the fan pressure and efficiency of the multi-wing centrifugal fan, and reducing the fan noise generated by the swirling impact when the air flow enters.

[0023] In this embodiment, the length L3 of the front disc straight portion 222 is 10 mm - 10.2 mm, the radius R2 of the front disc arc portion 221 is 53 mm - 55 mm and the arc length is 79 mm - 82 mm. The thickness L4 of the front disc arc portion 221 and the front disc straight portion 222 are equal and are 3 mm; from the air suction port 24 to the direction of the rear disc 23, the vertical distance L2 between the two ends of the front disc arc portion 221 is 54.3 mm - 54.5 mm; taking the plane passing through the central axis of the impeller 2 to intercept the impeller 2, the impeller clearance fit portion 223 forms an inverted L-shaped structure on the cross-section. The height L5 of the impeller clearance fit portion 223 is 1.9 mm - 2.1 mm, and the width L6 of the impeller clearance fit portion 223 is 4.5 mm - 5.5 mm. Preferably, L3 is 10.1 mm, R2 is 54 mm and the arc length is 80.5 mm, L2 is 54.4 mm, L5 is 2 mm, and L6 is 5 mm.

[0024] In this embodiment, the blade 21 includes a leading edge 211 and a trailing edge 212, a first side connecting between the first ends of the leading edge 211 and the trailing edge 212, and a second side connecting between the second ends of the leading edge 211 and the trailing edge 212. The first side is the side close to the air suction port 24, and the second side is the side far from the air suction port 24. Both the leading edge 211 and the trailing edge 212 are perpendicular to the rear disc 23. The inlet angle ∠1 of the blade 21 during installation is 109.3° - 111.3°, and the outlet angle ∠2 of the blade 21 during installation is 164° - 166°. On the projection plane of the rear disc 23, the radius R1 of the blade 21 is 39 mm - 41.5 mm and the arc length is 66.7 mm - 71 mm. The diameter φ1 of the impeller 2 is 570 mm. The diameter φ2 of the outer peripheral circle formed by the outer ends of all the blades 21 is 564 mm - 565 mm, and the diameter φ3 of the inner peripheral circle formed by the inner ends of all the blades 21 is 458.6 mm - 459.5 mm. The width L1 of the trailing edge 212 is 187.5 mm - 188.5 mm. The diameter φ4 of the air suction port 24 is 451.6 mm - 452.4 mm. The number of the blades 21 is 42. Preferably, φ2 is 564.6 mm, φ3 is 459.1 mm, φ4 is 452 mm, R1 is 40 mm and the arc length is 69.3 mm, ∠1 is 110.3°, ∠2 is 165°, and L1 is 188 mm.

[0025] According to the second aspect of the present invention, a multi-wing centrifugal fan includes a volute 1 and a collector 3 fixedly arranged in the volute 1, and further includes the above-mentioned impeller 2. The impeller 2 is arranged in the volute 1, and the impeller 2 is connected to the collector 3 through an impeller clearance fitting portion 223.

[0026] In this embodiment, the air collector 3 includes a connecting portion 31, a wind guiding portion 32, an air inlet 33, an air guiding port 34, and a rectifying anti-vortex ring 35. The air collector 3 is fixedly connected to the volute 1 through the connecting portion 31. The connecting portion 31 is in a circular ring shape and an air inlet 33 is formed in its inner circumference. The outlet of the wind guiding portion 32 forms the air guiding port 34. One end of the rectifying anti-vortex ring 35 is fixedly connected to the connecting portion 31, and the other end of the rectifying anti-vortex ring 35 is fixedly connected to the wind guiding portion 32. Taking a plane passing through the central axis of the air collector 3 to intercept the air collector 3, on the cross-section and in the direction from the air inlet 33 to the air guiding port 34, the wind guiding portion 32 includes a connected wind guiding portion arc segment 321 and a wind guiding portion straight segment 322. An air collector clearance fit portion 323 is provided at one end of the wind guiding portion straight segment 322 away from the wind guiding portion arc segment 321. The air collector clearance fit portion 323 is matched with the impeller clearance fit portion 223. The diameter φ5 of the air inlet 33 is 564.5 mm - 567.5 mm. The diameter of the wind guiding portion 32 first gradually decreases and then remains unchanged in the direction away from the air inlet 33. The radius R3 of the wind guiding portion arc segment 321 is 53 mm - 55 mm and the arc length is 83 mm - 86.5 mm. The length L7 of the wind guiding portion straight segment 322 is 23.5 mm - 24.5 mm. The diameter φ6 of the air guiding port 34 is 451.6 mm - 452.4 mm. The vertical distance L17 between the air inlet 33 and the air guiding port 34 is 80 mm - 82 mm. Preferably, φ5 is 566 mm, R3 is 54 mm and the arc length is 84.8 m, L7 is 24 mm, φ6 is 452 mm, and L17 is 81 mm.

[0027] In this embodiment, taking a plane passing through the central axis of the air collector 3 to intercept the air collector 3, on the cross-section, the air collector clearance fit portion 323 forms an inverted L-shaped structure. The height L9 of the air collector clearance fit portion 323 is 1.4 mm - 1.6 mm. The width L10 of the air collector clearance fit portion 323 is 9.5 mm - 10.5 mm. The thicknesses L8 of the wind guiding portion arc segment 321 and the wind guiding portion straight segment 322 are equal and are 3 mm. Preferably, L9 is 1.5 mm and L10 is 10 mm.

[0028] Through the above technical solutions, in cooperation with the improvements of the impeller 2 and the volute 1, the air collector 3 is matched and cooperated with the arc section 321 of the air guiding part designed with the same radius, the front disc arc section 221, the impeller clearance fit part 223 and the air collector clearance fit part 323 which are both designed in an inverted L shape. As a result, the air guiding port 34 of the air collector 3 is smoothly straight, without misalignment and seamlessly butted with the air suction port 24 of the arc-shaped front disc 22 of the impeller 2. The air collector 3 and the front disc of the impeller are in clearance fit axially and radially respectively, without the need to divide the space distance and sections, reducing the air duct friction and realizing a better installation fit between the impeller 2 and the air collector 3 through the impeller clearance fit part 223 and the air collector clearance fit part 323; by designing the rectifying anti-vortex ring 35, the generation of vortices inside the fan can be effectively prevented, improving the fan efficiency. At the same time, the strength of the air inlet is increased so that it is not easily deformed, making the air duct smoother.

[0029] In this embodiment, the profile line of the volute 1 includes a first diffuser straight section 11, a volute tongue section 12, a first arc section 13, a second arc section 14, a third arc section 15, a fourth arc section 16 and a second diffuser straight section 17 which are sequentially tangent and connected; the first diffuser straight section 11 and the second diffuser straight section 17 enclose an air outlet 18, and the first arc section 13, the second arc section 14, the third arc section 15 and the fourth arc section 16 are not concentric. Taking the center of the impeller 2 as the coordinate origin to establish a rectangular coordinate system, when the first diffuser straight section 11 is in the second quadrant, the center O1 of the first arc section 13 has coordinates (39.2, 39.2), the radius R5 is 318 mm - 320.5 mm and the arc length is 159 mm - 161 mm, the center O4 of the second arc section 14 has coordinates (39.2, -39.2), the radius R6 is 396 mm - 399 mm and the arc length is 622 mm - 627 mm, the center O3 of the third arc section 15 has coordinates (-39.2, -39.2), the radius R7 is 474 mm - 478 mm and the arc length is 745 mm - 750 mm, the center O2 of the fourth arc section 16 has coordinates (-39.2, 39.2), the radius R8 is 552 mm - 557 mm and the arc length is 867 mm - 875 mm, the second diffuser straight section 17 is perpendicular to the air outlet 18, and the first diffuser straight section 11 is inclined along the air outlet 18.

[0030] Preferably, a rectangular coordinate system is established with the center of the impeller 2 as the coordinate origin. When the first diffuser straight section 11 is located in the second quadrant, the coordinates of the center O1 of the first arc section 13 are (39.2, 39.2), the radius R5 is 319.2 mm, and the arc length is 160 mm; the coordinates of the center O4 of the second arc section 14 are (39.2, -39.2), the radius R6 is 397.6 mm, and the arc length is 624.5 mm; the coordinates of the center O3 of the third arc section 15 are (-39.2, -39.2), the radius R7 is 476 mm, and the arc length is 747.7 mm; the coordinates of the center O2 of the fourth arc section 16 are (-39.2, 39.2), the radius R8 is 554.4 mm, and the arc length is 870.8 mm.

[0031] In this embodiment, the width L12 of the air outlet 18 is 624 mm - 626 mm, and the height L13 is 354 mm - 356 mm; the radius R4 of the volute tongue section 12 is 27.6 mm - 28.4 mm, and the arc length is 91 mm - 93 mm; the length L11 of the first diffuser straight section 11 is 182 mm - 184 mm; the length L18 of the second diffuser straight section 17 is 394.5 mm - 397 mm; a tangent line is made to the volute tongue section 12 with the tangent point of the volute tongue section 12 and the first arc section 13 as the tangent point, and the included angle ∠3 between this tangent line and the first diffuser straight section 11 is 8.4° - 8.6°; the narrowest width L16 between the second diffuser straight section 17 and the volute tongue section 12 is 437 mm - 439 mm; the width L14 of the volute 1 is 1088 mm - 1092 mm, and the height L15 of the volute 1 is 969 mm - 971 mm. Preferably, L12 is 625 mm, the height L13 is 355 mm, R4 is 28 mm, the arc length is 92.1 mm, L11 is 183.1 mm, L18 is 395.8 mm, ∠3 is 8.51°, L16 is 438 mm, L14 is 1090 mm, and L15 is 970 mm.

[0032] In this embodiment, it further includes an air inlet flange 4, a motor 5, and a machine base 6. The air inlet flange 4 is fixedly arranged on the volute 1. The motor 5 is in transmission connection with the impeller 2 through a motor shaft. Both the volute 1 and the motor 5 are fixedly arranged on the machine base 6; the air inlet flange 4 is in a circular ring shape, and the diameter φ7 of the inner circumference is 568 mm - 572 mm. Preferably, φ7 is 570 mm.

[0033] Through the above technical solution, the logarithmic spiral volute 1 has an arc transition, ensuring the smooth and efficient flow of air in the volute 1; by changing the radian of the volute tongue of the fan and its longitudinal offset, the volute tongue is designed as a pointed and deep structure, which can reduce the recirculation area and effectively reduce noise.

[0034] To verify this embodiment, based on the preferred structural parameters provided in this embodiment, a multi-wing centrifugal fan with a multi-wing centrifugal fan impeller having an arc-shaped front disc was manufactured with the diameter of the impeller 2 being 570 mm as a test example for testing. At the same time, a multi-wing centrifugal fan with an impeller of a traditional straight front disc and a diameter of 570 mm was manufactured as a comparative example for testing. The test results were converted into test data under the test conditions of an atmospheric pressure of 101325 Pa, an atmospheric temperature of 20 °C, a fan speed of 960 r / min, and a medium density of 1.2 kg / m 3 The test data under the test conditions, and the test example obtained the test data shown in Table 1 and Figure 11 the performance curve shown, and the comparative example obtained the test data shown in Table 2 and Figure 12 the performance curve shown. The performance curve uses the volumetric flow rate as the abscissa. In the performance curve, qvsglGu is the volumetric flow rate, LAGu is the A-weighted sound level, ηr is the fan efficiency, PrGu is the impeller power, pFGu is the total pressure, and psFGu is the static pressure.

[0035] Table 1

[0036] Table 2

[0037] It can be seen from the test data and the performance curves that compared with the comparative example, the comparative example is worse than the test example in terms of total pressure, static pressure, fan efficiency, and A-weighted sound level. In contrast, the optimal fan efficiency of the test example is 75.843%, at this time the total pressure is 1406.9 Pa, and the A-weighted sound level is 83.025 dB; the optimal fan efficiency of the comparative example is 61.047%, at this time the total pressure is 1176.6 Pa, and the A-weighted sound level is 83.249 dB. Generally, the fan efficiency of the test example is higher than that of the comparative example, the total pressure is increased, and the A-weighted sound level of the test example generally decreases compared with that of the comparative example.

[0038] Compared with the prior art, a multi-wing centrifugal fan impeller and a multi-wing centrifugal fan with an arc-shaped front disc according to the present invention improve the problems such as insufficient total pressure, low efficiency, and high noise commonly existing in multi-wing centrifugal fans in the prior art.

[0039] Without conflict, the above embodiments and the features in the embodiments can be combined with each other.

[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the protection scope of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A multi-wing centrifugal fan impeller with an arc-shaped front disk, the impeller comprising a front disk and a rear disk, a suction port is provided in the middle of the front disk, and a plurality of blades are arranged in a circumferential array on the rear disk, characterized in that: The front disk is arranged in an arc-shaped structure. From the suction port towards the rear disk, the front disk includes a connected front disk straight part and a front disk arc part. At one end of the front disk straight part far from the front disk arc part, an impeller clearance fit part is provided, and the impeller clearance fit part is used to connect the impeller to the collector.

2. The impeller of a multi-wing centrifugal fan with an arc-shaped front disc according to claim 1, characterized in that: The length L3 of the front disk straight part is 10 mm - 10.2 mm, the radius R2 of the front disk arc part is 53 mm - 55 mm and the arc length is 79 mm - 82 mm. The thickness L4 of the front disk arc part and the front disk straight part is equal and is 3 mm. From the suction port towards the rear disk, the vertical distance L2 between the two ends of the front disk arc part is 54.3 mm - 54.5 mm; Taking the plane passing through the central axis of the impeller to intercept the impeller, on the cross-section, the impeller clearance fit part forms an inverted L-shaped structure. The height L5 of the impeller clearance fit part is 1.9 mm - 2.1 mm, and the width L6 of the impeller clearance fit part is 4.5 mm - 5.5 mm.

3. The multi-wing centrifugal fan impeller with an arc-shaped front disk according to claim 2, characterized in that: The blade includes a leading edge and a trailing edge, a first side connecting between the first ends of the leading edge and the trailing edge, and a second side connecting between the second ends of the leading edge and the trailing edge. The first side is the side close to the suction port, the second side is the side far from the suction port, and both the leading edge and the trailing edge are perpendicular to the rear disk; The inlet angle ∠1 of the blade during installation is 109.3° - 111.3°, the outlet angle ∠2 of the blade during installation is 164° - 166°. On the projection plane of the rear disk, the radius R1 of the blade is 39 mm - 41.5 mm and the arc length is 66.7 mm - 71 mm; The diameter φ1 of the impeller is 570 mm, the diameter φ2 of the outer peripheral circle formed by the outer ends of all the blades is 564 mm - 565 mm, the diameter φ3 of the inner peripheral circle formed by the inner ends of all the blades is 458.6 mm - 459.5 mm, and the width L1 of the trailing edge is 187.5 mm - 188.5 mm; The diameter φ4 of the suction port is 451.6 mm - 452.4 mm; The number of blades is 42.

4. The impeller of a multi-wing centrifugal fan with an arc-shaped front disc according to claim 3, characterized in that: φ2 is 564.6 mm, φ3 is 459.1 mm, φ4 is 452 mm, R1 is 40 mm and the arc length is 69.3 mm, R2 is 54 mm and the arc length is 80.5 mm, ∠1 is 110.3°, ∠2 is 165°, L1 is 188 mm, L2 is 54.4 mm, L3 is 10.1 mm, L5 is 2 mm, L6 is 5 mm.

5. A multi-wing centrifugal fan, comprising a volute and a collector fixedly arranged in the volute, characterized in that: It further includes the impeller according to any one of claims 1 - 4. The impeller is arranged in a volute, and the impeller is connected to the collector through the impeller clearance fit part.

6. The multi-wing centrifugal fan according to claim 5, characterized in that: The air collector includes a connecting part, a wind guiding part, an air inlet, an air guiding port and a rectifying anti-vortex ring. The air collector is fixedly connected to the volute through the connecting part. The connecting part is in a circular ring shape and an air inlet is formed in its inner circumference. The outlet of the wind guiding part forms the air guiding port. One end of the rectifying anti-vortex ring is fixedly connected to the connecting part, and the other end of the rectifying anti-vortex ring is fixedly connected to the wind guiding part; Taking the plane passing through the central axis of the air collector to intercept the air collector, on the cross-section and in the direction from the air inlet to the air guiding port, the wind guiding part includes a wind guiding part arc segment and a wind guiding part straight segment which are connected. At one end of the wind guiding part straight segment far from the wind guiding part arc segment, an air collector clearance fit part is arranged, and the air collector clearance fit part is arranged in a matching way with the impeller clearance fit part; The diameter φ5 of the air inlet is 564.5mm - 567.5mm. The diameter of the wind guiding part gradually decreases first and then remains unchanged in the direction away from the air inlet. The radius R3 of the wind guiding part arc segment is 53mm - 55mm and the arc length is 83mm - 86.5mm. The length L7 of the wind guiding part straight segment is 23.5mm - 24.5mm. The diameter φ6 of the air guiding port is 451.6mm - 452.4mm. The vertical distance L17 between the air inlet and the air guiding port is 80mm - 82mm.

7. The multi-wing centrifugal fan according to claim 6, wherein: Taking the plane passing through the central axis of the air collector to intercept the air collector, on the cross-section, the air collector clearance fit part forms an inverted L-shaped structure. The height L9 of the air collector clearance fit part is 1.4mm - 1.6mm. The width L10 of the air collector clearance fit part is 9.5mm - 10.5mm. The thicknesses L8 of the wind guiding part arc segment and the wind guiding part straight segment are equal and are 3mm.

8. The multi-wing centrifugal fan according to claim 7, wherein: The profile line of the volute includes a first diffuser straight segment, a volute tongue segment, a first arc segment, a second arc segment, a third arc segment, a fourth arc segment and a second diffuser straight segment which are successively tangent and connected; the first diffuser straight segment and the second diffuser straight segment enclose an air outlet, and the first arc segment, the second arc segment, the third arc segment and the fourth arc segment are not concentric; Taking the center of the impeller as the origin of the coordinate system to establish a rectangular coordinate system. When the first diffuser straight segment is in the second quadrant, the coordinates of the center O1 of the first arc segment are (39.2, 39.2), the radius R5 is 318mm - 320.5mm and the arc length is 159mm - 161mm. The coordinates of the center O4 of the second arc segment are (39.2, -39.2), the radius R6 is 396mm - 399mm and the arc length is 622mm - 627mm. The coordinates of the center O3 of the third arc segment are (-39.2, -39.2), the radius R7 is 474mm - 478mm and the arc length is 745mm - 750mm. The coordinates of the center O2 of the fourth arc segment are (-39.2, 39.2), the radius R8 is 552mm - 557mm and the arc length is 867mm - 875mm. The second diffuser straight segment is perpendicular to the air outlet, and the first diffuser straight segment is inclined along the air outlet.

9. The multi-wing centrifugal fan according to claim 8, wherein: The width L12 of the air outlet is 624mm - 626mm, and the height L13 is 354mm - 356mm; The radius R4 of the volute tongue segment is 27.6mm-28.4mm and the arc length is 91mm-93mm, the length L11 of the first diffuser straight segment is 182mm-184mm, the length L18 of the second diffuser straight segment is 394.5mm-397mm, and a tangent is drawn to the volute tongue segment with the tangent point of the volute tongue segment and the first arc segment as the tangent point. The angle ∠3 between the tangent and the first diffuser straight segment is 8.4°-8.6°, and the narrowest width L16 between the second diffuser straight segment and the volute tongue segment is 437mm-439mm; The width L14 of the volute is 1088mm-1092mm, and the height L15 of the volute is 969mm-971mm.

10. The multi-wing centrifugal fan according to claim 9, characterized in that: It also includes an air inlet flange, a motor and a machine base. The air inlet flange is fixedly arranged on the volute. The motor is connected to the impeller through the motor shaft. The volute and the motor are both fixedly arranged on the machine base. The air inlet flange is in a circular ring shape and the inner diameter φ7 is 568mm-572mm.

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