250kw mining axial flow fan K40-8-NO26 – Delivery of mining fan 

A 250kw mine axial flow fan, K40-8-NO26 Mine Fan, is being sent to mining enterprises in Hunan Province, China.Use explosion-proof motors with a voltage of 380V.The design service life of the fan is 15 years.

High efficiency, low noise, no humps in characteristic curve
New generation K and DK series mine energy-saving fans
1. Overview
The new generation K and DK series mine energy-saving fans were successfully designed based on the original mine energy-saving fans. Through technical improvements and structural refinement, their performance was enhanced and the machine size was expanded. This series of fans have higher efficiency, lower noise, a wider performance range, and more significant energy-saving effects. Additionally, a flow stabilizing ring device is installed in the main fan cylinder, eliminating humps in the characteristic curve, ensuring stable operation of the fan under any resistance conditions.
To expand the performance range of this series of fans and meet the needs of various large, medium, and small non-mine mines, so that ventilation networks with low, medium, high resistance and large, medium, small air volumes can all select main fans, auxiliary fans, and multi-stage station fans operating in the high-efficiency zone, this series of fans adopts two hub ratios (0.40 and 0.45), two structural types (single unit and counter-rotation), namely K40, K45 and DK40, DK45. And K40 uses 4, 6, and 8-pole motors for three speeds, K45 uses 4 and 6-pole motors for two speeds, and DK40 and DK45 use 6 and 8-pole motors for two speeds respectively.
In this way, by “combining” each machine size with two hub ratios, two structural types, and three speeds in a certain way, this series of fans has a total of 93 specifications.
The performance range and main technical parameters of the new generation K series and DK series mine energy-saving fans without humps are shown in Table 2 and Table 3 respectively. The reference weights listed in the table include the weight of the motor and diffuser of the entire machine.
The structural diagrams and size tables of the K40 and K45 series fans are shown in Figure 6 and Tables 6 and 7 respectively.
The model representation method (example) of the new generation K and DK series mine energy-saving fans is as follows: K 40– 4 №.15
Mining fan Model number is 15,
(“DJK” represents a twin-screw type mining fan) (i.e. the diameter of the working wheel D = 15dr;
Hub ratio d = 0.40 Motor pole number is 4, n = 1450 r/m