A multi-blade centrifugal fan and its grouping design method
A centrifugal fan and blade technology, which is applied in the field of multi-blade centrifugal fan and its group design, can solve the problems of limiting fan efficiency and the lack of research on the comprehensive design of multi-blade centrifugal fan systems, so as to improve flow conditions, increase fan efficiency, and eliminate vortices Effect
Active Publication Date: 2018-08-31
XI AN JIAOTONG UNIV +1
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Problems solved by technology
However, most of these works focus on the improvement or optimization of a single component of the fan, without careful consideration of the matching between the dynamic and static components, especially the impeller and the volute, which limits the further improvement of the fan efficiency
In fact, limited by the size of the structure, most of the multi-blade centrifugal fans do not have diffusers, and the non-axisymmetric effect between the impeller and the volute is very obvious. The comprehensive design of the multi-blade centrifugal fan system based on the accurate simulation of real flow is still relatively limited. scarcity
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[0041] See attached figure 1 with 2The structure of a specific embodiment of the present invention includes a volute 1, an impeller 2 and a volute tongue 4 arranged in the volute 1, and a current collector 3 arranged on the side of the volute, and the impeller 2 includes a wheel disc and a wheel cover and blades, the blades are double-arc-shaped, and the inlet installation angle of the blades β 1 is 81.72°, the outlet installation angle β of the blade 2 is 180°, the inlet and outlet radii of the blade are 160mm and 202mm respectively, and the intersection position R of the two arcs of the blade is f is 187.76mm, and the installation angle at the junction of the two circular arcs of the blade is β f is 95.17°, the intersection position R of the two circular arcs of the blade f It is located in the middle of the blade near the outlet, and the radius of the first arc from the impeller inlet is greater than the radius of the second arc;
[0042] The volute 1 is composed of fo...
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The invention discloses a multi-blades centrifugal fan and a group design method thereof. The multi-blades centrifugal fan comprises a volute shell, a blade wheel and a volute tongue arranged in the volute shell, and a collecting ring arranged on the side of the volute shell. The blade wheel comprises a wheel disc, a wheel cap, and a blade. The blade is double circular arc form, and an inlet incidence angel beta 1of the blade is 75 degrees-90 degrees, an outlet incidence angel beta 2 of the blade is160 degrees-180 degrees. The inlet and outlet radius of the blade are 160 mm and 202 mm respectively. The connected position of the two circular arcs Rf is 180 mm-195 mm, and an incidence angel beta f of the two circular arcs is 90 degrees-120 degrees. The volute shell is formed by the connection of four smooth circular slices which center on the four angles of an equal base side. The ratio of the width of the volute shell, the width of the collector, and the axial length of the impeller is 1.31:0.26:1. The volute tongue is a bionic structure based on a leading edge profile line of a long-eared owl airfoil type. The design method of the multi-blades centrifugal fan is that the blade, the volute shell, and the volute tongue are orderly improved designed in groups. The multi-blades centrifugal fan has the advantages that the flow separation degree can be reduced, the efficiency is increased, the pneumatic property is improved obviously, the design method enable to reduce calculated amount and is higher in reliability.
Description
technical field [0001] The invention relates to the field of aerodynamics, in particular to a multi-blade centrifugal fan and a grouping design method thereof. Background technique [0002] Compared with conventional backward centrifugal fans, multi-blade centrifugal fans have the advantages of high pressure coefficient, large flow coefficient, and compact structure, but they also have disadvantages such as serious flow separation, low efficiency, and huge energy waste. Therefore, how to eliminate or alleviate The phenomenon of flow separation and the reduction of flow loss play a vital role in improving the aerodynamic performance of multi-blade centrifugal fans, expanding the application range of multi-blade centrifugal fans, and developing energy-saving and environmentally friendly products. [0003] At present, the bottleneck restricting the substantial improvement of the performance of multi-blade centrifugal fans is the optimal design method of collectors, impellers an...
Claims
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IPC IPC(8): F04D29/30F04D29/28F04D29/42G06F17/50
CPCF04D29/281F04D29/30F04D29/4226F04D29/4233G06F30/17F04D29/282F04D29/441F05D2250/52
Inventor 王珂琚亚平张楚华吴兰勇解博超李清泉
Owner XI AN JIAOTONG UNIV