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CN-122014677-A - Volute, centrifugal fan and volute design method

CN122014677ACN 122014677 ACN122014677 ACN 122014677ACN-122014677-A

Abstract

The invention provides a volute, a centrifugal fan and a volute design method, wherein the volute comprises a volute molded line corresponding to an internal air channel of the volute, the volute molded line comprises a starting section, a main diffusion section and an outlet transition section which are sequentially arranged along the air flow direction, the expansion angle of the volute molded line is continuously increased along the air flow direction, the expansion angle gradient of the volute molded line is continuously decreased after continuously increasing to a peak value along the air flow direction, and the expansion angle gradient peak point of the volute molded line is positioned in the main diffusion section. The volute molded line adopts differential expansion angles and gradient change rules of the expansion angles so as to match the functional requirements of each area of the air channel in the volute.

Inventors

  • RONG GUANGWEI

Assignees

  • 极凛科技(上海)有限公司

Dates

Publication Date
20260512
Application Date
20260408

Claims (10)

  1. 1. The volute is characterized by comprising a volute molded line corresponding to an internal air channel, wherein the volute molded line comprises a starting section, a main diffusion section and an outlet transition section which are sequentially arranged along the air flow direction, the expansion angle of the volute molded line is continuously increased along the air flow direction, the expansion angle gradient of the volute molded line is continuously increased to a peak value along the air flow direction and then continuously decreased, and the expansion angle gradient peak point of the volute molded line is positioned in the main diffusion section.
  2. 2. The volute of claim 1, wherein the divergence angle gradient of the initial segment is between 0-0.02 DEG/mm and/or, The maximum value of the expansion angle gradient of the main diffusion section is 0.04-0.06 degrees/mm, and/or, The divergence angle gradient of the outlet transition section is 0.01-0.03 degrees/mm.
  3. 3. The volute of claim 1, wherein the ratio of the length of the starting section to the length of the volute profile is between 0.2 and 0.25, and/or, The ratio of the length of the main diffuser to the length of the volute profile is between 0.5 and 0.6, and/or, The ratio of the length of the outlet transition section to the length of the volute molded line is 0.15-0.3.
  4. 4. The volute of claim 1, wherein the volute profile is configured to satisfy s1/s2 = 0.4-0.6; wherein S1 is the line length between the starting point of the main diffusion section and the gradient peak point of the expansion angle, and S2 is the length of the main diffusion section.
  5. 5. The volute of claim 1, further comprising a volute tongue and a volute tongue profile corresponding to the volute tongue, the volute tongue profile being tangential to the volute profile.
  6. 6. A volute according to claim 5, wherein the radius of the volute tongue profile is between 3-8 mm.
  7. 7. A centrifugal fan comprising an impeller and a volute according to any one of claims 1 to 6.
  8. 8. A method of volute design, the method comprising: Establishing constraint conditions of a volute molded line, wherein the constraint conditions comprise a starting section, a main diffusion section and an outlet transition section which are sequentially arranged along the airflow direction, the expansion angle of the volute molded line is continuously increased along the airflow direction, the expansion angle gradient of the volute molded line is continuously increased to a peak value along the airflow direction and then is continuously decreased, and the expansion angle gradient peak point of the volute molded line is positioned in the main diffusion section; generating the volute profile that satisfies the constraint.
  9. 9. The method of volute design of claim 8, wherein the generating the volute shaped line that meets the constraint comprises: Generating the volute molded line meeting the constraint condition by adopting any one of polynomial curve fitting, spline curve fitting or control point curve fitting.
  10. 10. The volute design method of claim 8, wherein the constraints further comprise: the volute profile is configured to satisfy S1/s2=0.4-0.6, where S1 is the profile length between the start point of the main diffuser and the flare gradient peak point, S2 is the length of the main diffuser, and/or, The constraint condition also comprises that the divergence angle gradient of the initial section is between 0 and 0.02 degrees/mm, and/or, The constraint condition further comprises that the maximum value of the expansion angle gradient of the main diffusion section is between 0.04 and 0.06 degrees/mm, and/or, The constraint condition also comprises that the divergence angle gradient of the outlet transition section is between 0.01 and 0.03 degrees/mm and/or, The constraints further include a ratio of the length of the starting section to the length of the volute line of between 0.2 and 0.25, and/or, The constraint further includes a ratio of the length of the main diffuser to the length of the volute profile of between 0.5 and 0.6, and/or, The constraint condition further comprises that the ratio of the length of the outlet transition section to the length of the volute line is between 0.15 and 0.3.

Description

Volute, centrifugal fan and volute design method Technical Field The invention belongs to the technical field of fans, and particularly relates to a volute, a centrifugal fan and a volute design method. Background The volute of the centrifugal fan can collect high-speed airflow generated by high-speed rotation of the impeller and convert the kinetic energy of the airflow into static pressure energy, and the diffusion process of an air channel in the volute directly determines the static pressure recovery efficiency, flow stability, noise level and engineering suitability of the fan. The existing volute design mainly adopts mathematical tools such as high-order polynomials, equiangular spiral lines, control point fitting spline curves and the like to construct molded lines, and core logic is a preset geometric boundary condition, a high-order function is solved, and the molded lines are generated through integration. The design can realize geometric continuity of molded lines, but has the core limitations that the prior art generally regards the diffusion process of a volute air duct as a single whole, only focuses on final overall expansion ratio and molded line continuity, does not perform staged functional design aiming at flow characteristics of different diffusion stages, cannot perform targeted control on airflow flowing states of different diffusion stages, and causes the problems of separation of a volute tongue area boundary layer, low diffusion efficiency of a main diffusion area, large pressure pulsation of an outlet area and the like in practical application. The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person of ordinary skill in the art. Disclosure of Invention The invention aims to provide a volute, a centrifugal fan and a volute design method, which are used for solving the problem that the existing volute cannot control the air flow in different areas in the volute in a targeted manner. In order to achieve the above objective, a specific embodiment of the present invention provides a volute, where the volute includes a volute line corresponding to an internal air duct, the volute line includes a start section, a main diffuser section, and an outlet transition section sequentially arranged along an airflow direction, a divergence angle of the volute line continuously increases along the airflow direction, a divergence angle gradient of the volute line continuously increases to a peak value along the airflow direction and then continuously decreases, and a divergence angle gradient peak point of the volute line is located at the main diffuser section. In one or more embodiments of the invention, the divergence angle gradient of the starter section is between 0 and 0.02 °/mm. In one or more embodiments of the invention, the maximum value of the divergence angle gradient of the main diffuser is between 0.04 and 0.06 °/mm. In one or more embodiments of the invention, the divergence angle gradient of the outlet transition section is between 0.01 and 0.03 °/mm. In one or more embodiments of the invention, the ratio of the length of the starter section to the length of the volute line is between 0.2 and 0.25. In one or more embodiments of the invention, the ratio of the length of the main diffuser to the length of the volute profile is between 0.5 and 0.6. In one or more embodiments of the invention, the ratio of the length of the outlet transition section to the length of the volute profile is between 0.15 and 0.3. In one or more embodiments of the present invention, the volute profile is configured to satisfy s1/s2=0.4 to 0.6, where S1 is the profile length between the start point of the main diffuser and the peak point of the divergence angle gradient, and S2 is the length of the main diffuser. In one or more embodiments of the invention, the volute also includes a volute tongue and a volute tongue profile corresponding to the volute tongue, the volute tongue profile being tangential to the volute profile. In one or more embodiments of the invention, the radius of the volute tongue profile is between 3 and 8 mm. In another aspect, an embodiment of the present invention provides a centrifugal fan, which includes an impeller and the above-described volute. In yet another aspect, a specific embodiment of the present invention provides a method for designing a volute, including: The method comprises the steps of establishing constraint conditions of the volute molded line, wherein the constraint conditions comprise that the volute molded line comprises a starting section, a main diffusion section and an outlet transition section which are sequentially arranged along the airflow direction, the expansion angle of the volute molded line is continuously increased along the airflow di