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CN-122014642-A - Multi-wing centrifugal fan

CN122014642ACN 122014642 ACN122014642 ACN 122014642ACN-122014642-A

Abstract

The invention relates to the technical field of centrifugal fans, in particular to a multi-wing centrifugal fan which comprises a volute and an impeller, wherein an air outlet and two air inlets are formed in the volute, the impeller comprises a hub disc, a hub, two reinforcing rings and two groups of blade assemblies, the hub is fixedly connected to the center of the hub disc, the two groups of blade assemblies are respectively arranged on two opposite side faces of the hub disc in a staggered mode, each group of blade assemblies are fixedly connected with an inner ring of one reinforcing ring, the blade assemblies comprise a plurality of blades, the structures of each blade of the two groups of blade assemblies are identical, and the impeller is installed in the volute through preset size proportion and structural parameters. According to the invention, through optimizing the structural design of the impeller and the volute, precisely matching the critical dimension parameters and defining the positioning relation of each component, the aerodynamic performance, the running stability and the assembly consistency of the fan are improved, and the running noise and the abrasion are reduced.

Inventors

  • PANG LIBIN
  • XIAO FUJIAN
  • Wang Remo
  • LIU DEBO

Assignees

  • 广东诺坚精密科技有限公司

Dates

Publication Date
20260512
Application Date
20260310

Claims (10)

  1. 1. The multi-wing centrifugal fan is characterized by comprising a volute (1) and an impeller (2); the volute (1) is provided with an air outlet (11) and two air inlets (12), planes of the two air inlets (12) are relatively arranged in parallel, the centers of the two air inlets (12) are defined as an axle center O ', and the axes passing through the two axle centers O' are defined as rotating shafts of the volute (1); The impeller (2) comprises a hub disc (21), a hub (22), two reinforcing rings (23) and two groups of blade assemblies (24), wherein the hub (22) is fixedly connected to the center of the hub disc (21), the two groups of blade assemblies (24) are respectively arranged on two opposite side surfaces of the hub disc (21) in a staggered manner, and each group of blade assemblies (24) is fixedly connected with the inner ring of one reinforcing ring (23); The blade assembly (24) comprises a plurality of blades (241), wherein each blade (241) of the two groups of blade assemblies (24) has the same structure, the peripheral outline of each blade (241) is formed by encircling a front blade edge (2411), a top blade edge (2412), a rear blade edge (2413) and a bottom blade edge (2414), a plurality of blades (241) are uniformly distributed on the corresponding side surface of the hub disc (21) at equal intervals, the bottom blade edge (2414) of each blade (241) is fixedly connected with the corresponding side surface of the hub disc (21), the rear blade edge (2413) of each blade (241) is flush with the outer edge of the hub disc (21), the rear blade edge (2413) of each blade (241) is fixedly connected with the inner ring corresponding to the reinforcing ring (23), the top blade edge (2412) of each blade (241) is smoothly connected with the top edge of the corresponding reinforcing ring (23), and the top blade edge (2412) of each blade (241) is smoothly connected with the top edge of the corresponding ring (23) and forms a non-flush structure with the top blade edge (2412); The center of the hub disc (21) and the centers of the two reinforcing rings (23) are overlapped, and are defined as the axis O of the impeller (2), and the axis passing through the axis O and perpendicular to the disc surface of the hub disc (21) is defined as the rotation axis of the impeller (2); The impeller (2) is arranged in the volute (1) through a preset size proportion and a preset structural parameter, the axle center O and the axle center O' are overlapped, and a rotating shaft of the impeller (2) and a rotating shaft of the volute (1) are arranged in a collinear mode.
  2. 2. A multi-wing centrifugal fan according to claim 1, wherein both sets of said blade assemblies (24) comprise Z blades (241), the stagger angle of both sets of said blade assemblies (24) on both sides of said hub disk (21) being 360 °/Z/2,39 +.z+.47.
  3. 3. A multi-wing centrifugal fan according to claim 1, wherein the axial distance between the highest and lowest points of the individual non-flush tip structures (25) is defined as B4, projected in a direction perpendicular to the rotational axis of the volute (1); Defining an axial distance B1 between the highest points of the non-flush tip structures (25) of two sets of said blade assemblies (24); -defining the axial distance between the highest point of the non-flush tip structure (25) of both sets of said vane assemblies (24) and the inner wall of the volute (1) as B2; -defining the axial distance between the lowest point of the non-flush tip structure (25) of both sets of said blade assemblies (24) and the end of the wind guiding portion (13) as B3; The cross section of the air guide part (13) is an arc, and the radius of the arc of the air guide part (13) is defined as r1; Wherein, the 125 mm≤B1≤155 mm,2 mm≤B2-r1≤5mm, 4 mm≤B3≤8mm, B4=B3- (B2-r 1).
  4. 4. The multi-wing centrifugal fan according to claim 1, wherein the vane front edges (2411) of all vanes (241) in the same group of vane assemblies (24) are connected by taking the axis O as a center to form an inner circle of the vane (241), and the diameter of the inner circle of the vane (241) is defined as the inner diameter D2 of the vane; defining the diameter of the inner ring of the reinforcing ring (23) as an impeller outer diameter D1; defining the diameter of the outer ring of the reinforcement ring (23) as an impeller diameter D3; wherein d1/d2=1.15 to 1.25, d3=d1+2.8 mm.
  5. 5. The multi-wing centrifugal fan according to claim 4, wherein edges of two air inlets (12) of the volute (1) extend towards the inside of the volute (1) and gradually retract inwards to form an air guide part (13), the tail ends of the air guide part (13) are enclosed to form an air guide opening (14), the air inlets (12) and the air guide opening (14) are circular, and the diameter of the air guide opening (14) is defined as D4; wherein, D4/d2=1.03 to 1.05.
  6. 6. A multi-wing centrifugal fan according to claim 1, wherein each blade (241) in the blade assembly (24) has an inlet angle β1 and an outlet angle β2, projected in the direction of the rotation axis of the impeller (2); wherein β1=78° -83 °, β2=155° -160 °.
  7. 7. The multi-wing centrifugal fan according to claim 4, wherein the inner wall of the volute (1) forms a volute shaped line projected along the direction of the rotation axis of the volute (1), and the volute shaped line is formed by enclosing an outlet section, a diffuser section and a volute tongue section; The diffusion section comprises a first arc line section, a second arc line section, a third arc line section and a fourth arc line section which are sequentially connected, wherein a starting end point of the first arc line section is defined as a design point P1, a connection point of the first arc line section and the second arc line section is defined as a design point P2, a connection point of the second arc line section and the third arc line section is defined as a design point P3, a connection point of the third arc line section and the fourth arc line section is defined as a design point P4, and a termination end point of the fourth arc line section is defined as a design point P5; The first arc line segment is controlled and set by the design point P1 and the design point P2, and the radius of a circle corresponding to the first arc line segment is R 1 ; the second arc line segment is controlled and set by the design point P2 and the design point P3, and the radius of a circle corresponding to the second arc line segment is R 2 ; The third arc line segment is controlled and set by the design point P3 and the design point P4, and the radius of a circle corresponding to the third arc line segment is R 3 ; the fourth arc line segment is controlled and set by the design point P4 and the design point P5, and the radius of a circle corresponding to the fourth arc line segment is R 4 ; Wherein R2< R1< R3< R4, and the difference between any two adjacent radii is not more than 10%.
  8. 8. The multi-wing centrifugal fan according to claim 7, wherein a straight line distance between the design point P3 and the design point P5 is defined as a volute width Dh; defining the shortest linear distance from the design point P3 to the outer ring of the reinforcing ring (23) as A1; Defining the shortest linear distance from the design point P5 to the outer ring of the reinforcing ring (23) as A; wherein Dh/D3 is more than or equal to 1.3 and is more than or equal to 1.4,4.5 and A/A1 is more than or equal to 5.5.
  9. 9. The multi-wing centrifugal fan of claim 7, wherein the volute tongue section includes a fifth arc segment; Defining two endpoints of the fifth arc segment as a design point P0 and the design point P1 respectively; The radius of the circle corresponding to the fifth arc line segment is the radius r of the volute tongue; defining the shortest linear distance between the fifth arc section and the outer ring of the reinforcing ring (23) as a volute tongue clearance t; wherein R < R2, t/D is more than or equal to 0.04 3 is less than or equal to 0.05.
  10. 10. The multi-wing centrifugal fan according to claim 1, wherein the blade (241) has a pressure side (2415) and a suction side (2416), the pressure side (2415) and suction side (2416) being oppositely disposed; the pressure surface (2415) and the suction surface (2416) form a pressure edge profile and a suction edge profile respectively, projected in the direction of the rotation axis of the impeller (2); The pressure edge molded line is a sixth arc line segment, two endpoints defining the sixth arc line segment are respectively a design point Q0 and a design point Q1, and the radius of a circle corresponding to the sixth arc line segment is R 5 ; The suction edge molded line comprises a seventh arc line segment, an eighth arc line segment and a ninth arc line segment which are sequentially connected, wherein the seventh arc line segment is arranged close to the trailing edge (2413) of the blade, the ninth arc line segment is arranged close to the leading edge (2411) of the blade, a starting end point of the seventh arc line segment is defined to be a design point Q2, a connecting point of the seventh arc line segment and the eighth arc line segment is defined to be a design point Q3, a connecting point of the eighth arc line segment and the ninth arc line segment is defined to be a design point Q4, a terminating end point of the ninth arc line segment is defined to be a design point Q5, the seventh arc line segment is controlled and arranged by the design point Q2 and the design point Q3, a radius corresponding to the seventh arc line segment is R 6 , a radius corresponding to the eighth arc line segment is controlled and arranged by the design point Q3 and the design point Q4, a radius corresponding to the eighth arc line segment is R 7 , the ninth arc line segment is controlled and arranged by the design point Q4 and the design point Q5, and a radius corresponding to the ninth arc segment is R 8 ; Wherein, R 8 ＜R 5 ＜R 7 ＜R 6 .

Description

Multi-wing centrifugal fan Technical Field The invention relates to the technical field of centrifugal fans, in particular to a multi-wing centrifugal fan. Background The multi-wing centrifugal fan is widely applied to a plurality of fields such as air conditioning, ventilation, refrigeration and the like by virtue of the characteristics of large flow, moderate pressure and low noise. The existing multi-wing centrifugal fan generally adopts a single air inlet or double air inlet structure, wherein the double air inlet structure is the optimization of medium and large air quantity demand scenes because of being capable of effectively improving air inlet efficiency and balancing impeller stress. The double-air-inlet multi-wing centrifugal fan still has the defects that firstly, the connection part of blades of an impeller and a reinforcing ring is hard in transition, most of blade tops are in a flush structure, airflow vortex is easy to generate, the efficiency of the fan is reduced, noise is high, secondly, the assembly positioning precision of the impeller and a volute is insufficient, the superposition degree of a rotating shaft is difficult to ensure, vibration, abrasion and the like are easy to occur during long-term operation, thirdly, the dimensional proportion and structural parameter design of the impeller and the volute are unreasonable, particularly, the matching degree of key parameters such as the angle of the blades, the molded line of the volute, the size of a gap and the like is low, the pneumatic performance and the operation stability of the fan are further restricted, fourthly, the definition of part of key parameters is fuzzy, the reference is disordered, the production and assembly precision of the fan is difficult to control, and the consistency of products is poor during mass production. Aiming at the problems, a multi-wing centrifugal fan with reasonable structural design, accurate parameter matching and stable and efficient operation is needed to solve the defects in the prior art. Disclosure of Invention The invention aims to provide a multi-wing centrifugal fan, which aims to solve the technical problems of low efficiency, high noise, unstable operation and poor production consistency of the multi-wing centrifugal fan in the prior art. To achieve the purpose, the invention adopts the following technical scheme: A multi-wing centrifugal fan comprises a volute and an impeller; The volute is provided with an air outlet and two air inlets, planes of the two air inlets are arranged in parallel relatively, the centers of the two air inlets are defined as an axle center O ', and the axes passing through the two axle centers O' are defined as rotating shafts of the volute; The impeller comprises a hub disc, a hub, two reinforcing rings and two groups of blade assemblies, wherein the hub is fixedly connected to the center of the hub disc, the two groups of blade assemblies are respectively arranged on two opposite side surfaces of the hub disc in a staggered manner, and each group of blade assemblies is fixedly connected with the inner ring of one reinforcing ring; The peripheral outline of each blade is formed by encircling a front edge, a top edge, a rear edge and a bottom edge of each blade, the blades are uniformly distributed on the corresponding side surface of the hub disc at equal intervals, the bottom edge of each blade is fixedly connected with the corresponding side surface of the hub disc, the rear edge of each blade is flush with the outer edge of the hub disc, the rear edge of each blade is fixedly connected with the inner ring of the corresponding reinforcing ring, the top edge of each blade is in smooth transitional connection with the top edge of the corresponding reinforcing ring, and the top edge of each blade and the top edge of the corresponding reinforcing ring form a non-flush top structure; the center of the hub disc and the centers of the two reinforcing rings are overlapped, and are defined as the axis O of the impeller, and the axis passing through the axis O and perpendicular to the disc surface of the hub disc is defined as the rotating shaft of the impeller; the impeller is arranged in the volute through a preset size proportion and a preset structural parameter, the axle center O and the axle center O' are overlapped, and the rotation shaft of the impeller and the rotation shaft of the volute are arranged in a collinear manner. Preferably, the two groups of blade assemblies comprise Z blades, and the stagger angle of the two groups of blade assemblies on the two side surfaces of the hub disc is 360 degrees/Z/2,39 is less than or equal to Z and less than or equal to 47. Preferably, the axial distance between the highest point and the lowest point of the single non-flush tip structure is defined as B4, as projected in a direction perpendicular to the rotational axis of the volute; defining an axial distance B1 between the highest points of the non-flush tip struc