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CN-122014669-A - Backward centrifugal wind wheel

CN122014669ACN 122014669 ACN122014669 ACN 122014669ACN-122014669-A

Abstract

The invention discloses a backward centrifugal wind wheel which comprises a wheel cover, a wheel disc and a plurality of blades, wherein the blades are equidistantly arranged between the wheel cover and the wheel disc, an air inlet is formed in the center of the wheel cover, an air outlet is formed between every two adjacent blades, the wheel disc comprises a wheel disc center part and a plurality of wheel disc wing parts, hollowed-out parts are formed between every two adjacent wheel disc wing parts, blade tops are connected with the wheel cover, front edges of the blades are close to the air inlet, she Weiyuan are close to the air outlet, blade roots of the blades are correspondingly connected with the wheel disc wing parts one by one, and under the axial projection of the wind wheel, the projection area of the hollowed-out parts is at least partially overlapped with the projection area of the air inlet. The hollow part is skillfully arranged on the wheel disc, so that the problems of difficult demoulding and complex mould of the traditional integrally formed wind wheel are solved, the integrated production with low cost and high efficiency is realized, and the excellent wing-shaped design of the blade is reserved, the wind wheel is ensured to have excellent aerodynamic performance, and the double requirements of the field on the efficient production and the excellent performance of the backward centrifugal wind wheel are truly met.

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
20260330

Claims (10)

  1. 1. The backward centrifugal wind wheel is characterized by comprising a wheel cover (1), a wheel disc (2) and a plurality of blades (3), wherein the blades (3) are arranged between the wheel cover (1) and the wheel disc (2), and the blades (3) are equidistantly arranged around a wind wheel rotating shaft L; an air inlet (01) is formed in the center of the wheel cover (1), and an air outlet (02) is formed between adjacent blades (3); the blade (3) is in a wing shape, and the blade (3) comprises a blade root (31), a blade top (32), a blade front edge (33) and She Weiyuan (34); The wheel disc (2) comprises a wheel disc central part (21) and a plurality of wheel disc wing parts (22), wherein the wheel disc wing parts (22) are circumferentially and uniformly distributed on the outer edge of the wheel disc central part (21), and hollowed-out parts (23) are formed between adjacent wheel disc wing parts (22); the number of blades (3) is the same as the number of disc wings (22); The blade tops (32) are connected with the wheel cover (1), the front edges (33) of the blades are close to the air inlet (01), the She Weiyuan (34) of the blades are close to the air outlet (02), and the blade roots (31) of the blades (3) are respectively connected with the wheel disc wing parts (22) in a one-to-one correspondence mode; Under the axial projection of the wind wheel, the projection area of the hollowed-out part (23) is at least partially overlapped with the projection area of the air inlet (01).
  2. 2. The backward centrifugal wind wheel according to claim 1, wherein the number of the blades (3) is z, and z is more than or equal to 5 and less than or equal to 11.
  3. 3. A backward centrifugal wind wheel according to claim 2, wherein the maximum outer diameter of the wheel disc (2) is smaller than the maximum outer diameter of the shroud (1).
  4. 4. A backward centrifugal wind wheel according to claim 2, wherein the wheel disc wing (22) comprises a first curve (221), a second curve (222) and a connecting section; the connecting section is connected with the central part (21) of the wheel disc; One end of the first curve (221) is connected with one end of the connecting section, and the other end of the first curve (221) extends in a direction away from the wind wheel rotation axis L; One end of the second curve (222) is connected with the other end of the connecting section, and the other end of the second curve (222) is connected with the other end of the first curve (221); The first curve (221) is connected to the blade root (31); The ends of two adjacent connecting sections are connected through a transition arc section (223), the transition arc section (223) is formed at the outer edge of the central part (21) of the wheel disc, and the transition arc section (223) is recessed towards the direction of the wind wheel rotation axis L.
  5. 5. A backward centrifugal wind wheel according to claim 4, wherein the wrap angle of the transition arc segment (223) is alpha, wherein, 。
  6. 6. A backward centrifugal wind wheel according to claim 5, wherein the wheel (2) further comprises a flange portion (25), the flange portion (25) being located on one side of the second curve (222) of the wheel wing (22).
  7. 7. A backward centrifugal wind wheel according to claim 5, wherein said wheel disc (2) further comprises a reinforcing rib (24), said reinforcing rib (24) being provided on a surface of said wheel disc (2) on a side remote from said blades (3); the reinforcing rib (24) comprises a radial extension (241) and a flange extension (242); the radially extending portion (241) is located at the disc center portion (21), and the radially extending portion (241) extends in a radial direction of the disc center portion (21); The flange extension part (242) is positioned on the wheel disc wing part (22) and extends along the extension direction of the first curve (221) and the second curve (222).
  8. 8. The backward centrifugal wind wheel according to claim 4, wherein the second curve (222) is any one of a straight line, a curved line, an S-shape and a wave shape.
  9. 9. The backward centrifugal wind wheel according to claim 1, wherein the stacking line of She Weiyuan (34) is any one of a straight line shape, an arc shape or an S shape.
  10. 10. A backward centrifugal wind wheel according to claim 1, wherein said She Weiyuan (34) is saw-tooth shaped.

Description

Backward centrifugal wind wheel Technical Field The invention relates to the technical field of centrifugal wind wheels, in particular to a backward centrifugal wind wheel. Background The backward centrifugal wind wheel is used as a core component in ventilation, air conditioning, refrigeration and various fluid machines, and the performance and the manufacturing process of the backward centrifugal wind wheel are directly related to the energy efficiency and the production cost of the whole machine. The current commercial backward centrifugal wind wheel mainly comprises a wheel disc, a wheel cover and a plurality of backward blades distributed between the wheel disc and the wheel cover. In the existing manufacturing technology, in order to pursue better aerodynamic performance, a split assembly structure is generally adopted for the backward centrifugal wind wheel. The production method comprises the steps of respectively manufacturing the wheel disc, the wheel cover and each fan blade independently through injection molding or stamping, and then assembling and fixing tens of blades between the wheel disc and the wheel cover one by one through secondary processing modes such as buckling, ultrasonic welding or gluing. The modularized production mode reduces the dependence on a single die to a certain extent, but has obvious defects that on one hand, the whole production efficiency is low due to the fact that independent production and inventory management of a plurality of parts are involved and assembly procedures are numerous, and the market demand of large-scale quick delivery is difficult to meet, on the other hand, the multi-part assembly structure necessarily has assembly tolerance, vibration and noise are easy to generate due to loosening or fatigue of a connecting part during long-term operation, meanwhile, air flow is disturbed due to unsmooth transition of the connecting part, and the pneumatic stability of the wind wheel is influenced. In order to solve the problem of low production efficiency, some manufacturers in industry try to directly manufacture the backward centrifugal wind wheel by adopting an integral molding technology. However, because the trailing blades typically have complex curves and angles of inclination, the draft must be considered with conventional integral stripping processes, which often results in a blade profile that is forced to be simplified or a non-uniform thickness distribution, failing to maintain an optimal aerodynamic airfoil design. Therefore, the existing wind wheel produced by integral demoulding is quite inferior to the traditional assembled wind wheel in key performance indexes such as air quantity, wind pressure or noise control due to the fact that the fluid performance is sacrificed although the wind wheel is manufactured quickly. In summary, the existing production modes of the backward centrifugal wind wheel all have short plates, the modularized production efficiency is low, the cost is high, the performance is insufficient in integrated demolding production, and the dual requirements of industry on efficient production and excellent performance of the wind wheel are difficult to meet, so that the backward centrifugal wind wheel capable of realizing simple and efficient demolding integrated production and having good blade performance is developed and becomes a technical problem to be solved in the current field. Disclosure of Invention Aiming at the problems of the background technology, the invention aims to provide a backward centrifugal wind wheel, which solves the limitation that the integral molding of the backward centrifugal wind wheel in the prior art inevitably leads to performance compromise. To achieve the purpose, the invention adopts the following technical scheme: the backward centrifugal wind wheel comprises a wheel cover, a wheel disc and a plurality of blades, wherein the blades are arranged between the wheel cover and the wheel disc, and the blades are equidistantly arranged around a wind wheel rotating shaft L; An air inlet is formed in the center of the wheel cover, and an air outlet is formed between every two adjacent blades; The blade is in an airfoil-shaped arrangement and comprises a blade root, a blade tip, a blade front edge and She Weiyuan; the wheel disc comprises a wheel disc central part and a plurality of wheel disc wing parts, wherein the wheel disc wing parts are circumferentially and uniformly distributed at the outer edge of the wheel disc central part, and hollow parts are formed between adjacent wheel disc wing parts; The number of the blades is the same as the number of the wheel disc wings; The blade tops are connected with the wheel cover, the front edges of the blades are close to the air inlet, the She Weiyuan is close to the air outlet, and the blade roots of a plurality of blades are respectively connected with a plurality of wheel disc wing parts in a one-to-one correspondence manner; And under the axial pro