Plateau tunnel axial-flow type construction fan blade

Abstract

The utility model relates to the field of construction ventilation systems and axial flow fans, in particular to a plateau tunnel axial flow type construction fan blade with the hub ratio larger than or equal to 0.57. The plateau tunnel axial flow type construction fan blade is characterized in that the blade is divided into ten sections in the height direction, the number of the sections is increased, and the hub ratio is larger than or equal to 0.57. The blade profile design accuracy of the blade is effectively improved, the chord length of the blade is increased, the requirement of a high-pressure head of a plateau tunnel axial-flow type construction fan can be met, and meanwhile, the blade can be universally used for fans with different hub ratios, especially the plateau tunnel axial-flow type construction fan with the hub ratio larger than 0.57.

Description

Technical Field

[0001] The utility model relates to the fields of construction ventilation systems and axial fans, and particularly relates to a blade of an axial flow construction fan for a plateau tunnel with a hub ratio greater than or equal to 0.57. Background Art

[0002] With the rapid development of China's transportation industry and the continuous improvement of tunnel construction technology, various extra-long tunnels, large-section tunnels, and complex underground cavern groups have emerged in large numbers. During the construction stage of tunnels and underground projects, ventilation is an essential way to exchange air with the outside world, and it is an indispensable safeguard measure to provide fresh air for operators and maintain the normal operation of mechanical and electrical equipment. Especially for plateau tunnels under special circumstances, it is necessary to ensure sufficient air volume in the tunnel, dilute and reduce the concentration of harmful substances in the tunnel, and discharge the polluted air outside the tunnel to avoid harm to personnel health and the occurrence of disasters. Therefore, it is usually necessary to install an axial flow construction fan for a plateau tunnel with low flow and high head at the tunnel entrance. In the current fan industry, axial fans are the most common ventilation machinery. The impeller is one of the main components of an axial fan, and the blade is the key component that provides air flow for the fan. The utility model patent with the authorization announcement number CN206708092U proposes an axial flow adjustable fan blade with seven cross-sections that can be cut when the hub ratio is greater than 0.59. However, the chord length of this blade is not long, and the head is not high, which cannot meet the requirements of the plateau tunnel construction site. Moreover, the cross-section of this blade is seven cross-sections, which cannot meet the high design requirements of the blade profile of the axial flow construction fan for a plateau tunnel. Content of the Utility Model

[0003] The purpose of the utility model is to overcome the above defects and provide a blade of an axial flow construction fan for a plateau tunnel, which can effectively meet the requirements of low flow and high head at the plateau tunnel construction site, and at the same time increase the number of cross-sections of the blade and improve the accuracy of the blade profile design.

[0004] Technical solution of the utility model: An axial-flow construction fan blade for a plateau tunnel is designed by calculating the flow field to determine the characteristics of each cross-section. The blade is characterized in that the blade root is the position close to the hub, and the blade tip is the position close to the inner side of the turbine casing. The blade can be divided into ten cross-sections in the height direction, namely cross-section I, cross-section II, cross-section III, cross-section IV, cross-section V, cross-section VI, cross-section VII, cross-section VIII, cross-section IX, and cross-section X. Define the hub radius as R mm. Taking the installation angle of cross-section I perpendicular to the oncoming flow direction as 0°, the cross-section height is R×100% mm, the maximum cross-section thickness is R×6.30% mm, and the chord length is R×70.53% mm; the installation angle of cross-section II is -5.6°, the cross-section height is R×109.04% mm, the maximum cross-section thickness is R×4.16% mm, and the chord length is R×70.33% mm; the installation angle of cross-section III is -10.6°, the cross-section height is R×118.09% mm, the maximum cross-section thickness is R×2.69% mm, and the chord length is R×69.97% mm; the installation angle of cross-section IV is -15.2°, the cross-section height is R×127.13% mm, the maximum cross-section thickness is R×2.15% mm, and the chord length is R×69.52% mm; the installation angle of cross-section V is -19.2°, the cross-section height is R×136.20% mm, the maximum cross-section thickness is R×1.66% mm, and the chord length is R×69.02% mm; the installation angle of cross-section VI is -22.7°, the cross-section height is R×145.21% mm, the maximum cross-section thickness is R×1.43% mm, and the chord length is R×68.51% mm; the installation angle of cross-section VII is -25.7°, the cross-section height is R×154.26% mm, the maximum cross-section thickness is R×1.18% mm, and the chord length is R×67.98% mm; the installation angle of cross-section VIII is -28.2°, the cross-section height is R×163.31 mm, the maximum cross-section thickness is R×0.87% mm, and the chord length is R×67.48% mm; the installation angle of cross-section IX is -30.1°, the cross-section height is R×172.36% mm, the maximum cross-section thickness is R×0.72% mm, and the chord length is R×66.98% mm; the installation angle of cross-section X is -31.1°, the cross-section height is R×177.83% mm, the maximum cross-section thickness is R×0.70% mm, and the chord length is R×66.75% mm.

[0005] The beneficial effect of the utility model lies in that: The blade of the utility model adopts ten cross-sections. The increase in the number of blade cross-sections improves the design accuracy of the blade profile. The chord length of the blade cross-section increases, making the blade wider and improving the head of the axial-flow construction fan for the plateau tunnel. Description of the drawings

[0006] Figure 1 It is a cross-sectional view of the blade of the utility model.

[0007] Figure 2 This is the sectional area overlay drawing of the present utility model.

[0008] Figure 3 This is the top view of the blade of the present utility model.

[0009] In the attached drawings, the corresponding technical features are marked as follows:

[0010] 1 - Section Ⅰ, 2 - Section Ⅱ, 3 - Section Ⅲ, 4 - Section Ⅳ, 5 - Section Ⅴ, 6 - Section Ⅵ, 7 - Section Ⅶ, 8 - Section VIII, 9 - Section IX, 10 - Section X. Detailed implementation mode

[0011] The present utility model will be further described below in conjunction with the attached drawings and embodiments.

[0012] Embodiment 1

[0013] If it is necessary to design an axial flow construction fan for high - altitude tunnels with a hub diameter of 800 mm and a hub ratio of 0.57, then the hub radius is 400 mm. Calculated according to the technical indicators in the content of the utility model, the data of each section are as follows:

[0014] The installation angle of Section Ⅰ is 0°, the section height is 400 mm, the maximum section thickness is 25.20 mm, and the chord length is 282.12 mm; the installation angle of Section Ⅱ is - 5.6°, the section height is 436.16 mm, the maximum section thickness is 16.64 mm, and the chord length is 281.32 mm; the installation angle of Section Ⅲ is - 10.6°, the section height is 472.36 mm, the maximum section thickness is 10.76 mm, and the chord length is 279.88 mm; the installation angle of Section Ⅳ is - 15.2°, the section height is 508.52 mm, the maximum section thickness is 8.60 mm, and the chord length is 278.08 mm; the installation angle of Section Ⅴ is - 19.2°, the section height is 544.80 mm, the maximum section thickness is 6.64 mm, and the chord length is 276.08 mm; the installation angle of Section Ⅵ is - 22.7°, the section height is 580.84 mm, the maximum section thickness is 5.72 mm, and the chord length is 274.04 mm; the installation angle of Section Ⅶ is - 25.7°, the section height is 617.04 mm, the maximum section thickness is 4.72 mm, and the chord length is 271.92 mm; the installation angle of Section VIII is - 28.2°, the section height is 653.24 mm, the maximum section thickness is 3.48 mm, and the chord length is 269.92 mm; the installation angle of Section IX is - 30.1°, the section height is 689.44 mm, the maximum section thickness is 2.88 mm, and the chord length is 267.92 mm; the installation angle of Section X is - 31.1°, the section height is 711.32 mm, the maximum section thickness is 2.80 mm, and the chord length is 267.00 mm.

[0015] That is, multiply the sectional dimensions and the distances between sections in Figure 1 by the ratio of the hub radius R to obtain the sectional data of the target blade. As Figure 2 shown, then stack the sections to form the three-dimensional entity of the target blade.

[0016] Embodiment 2

[0017] If it is necessary to design the blades of an axial flow construction fan for a plateau tunnel with a hub diameter of 800 mm and a hub ratio of 0.6, the blade sectional data is generated in the same process as in Example 1. After the overall forming of the blade, due to the relatively large hub ratio, the blade is shorter than the blade with a hub ratio of 0.57. The top of the blade can be cut off to the required outer diameter of the blade.

Claims

1. A plateau tunnel axial flow construction fan blade, characterized by: The blade root is close to the hub, and the blade tip is close to the inner side of the impeller casing. The blade can be divided into ten sections in the height direction, namely Section I, Section II, Section III, Section IV, Section V, Section VI, Section VII, Section VIII, Section IX, and Section X. The hub radius is defined as R mm, and the installation angle of Section I is 0° with the direction perpendicular to the incoming flow. The section height is R×100% mm, the maximum section thickness is R×6.30% mm, and the chord length is R×70.53% mm; the installation angle of Section II is -5.6°, and the section height is -100% mm. The installation angle of section III is -10.6°, the section height is R×118.09%mm, the maximum section thickness is R×2.69%mm, and the chord length is R×69.97%mm; the installation angle of section IV is -15.2°, the section height is R×127.13%mm, the maximum section thickness is R×2.15%mm, and the chord length is R×69.52%mm; the installation angle of section V is -19.2 °, section height is R×136.20%mm, maximum section thickness is R×1.66%mm, chord length is R×69.02%mm; the installation angle of section VI is -22.7°, the section height is R×145.21%mm, the maximum section thickness is R×1.43%mm, chord length is R×68.51%mm; the installation angle of section VII is -25.7°, the section height is R×154.26%mm, the maximum section thickness is R×1.18%mm, chord length is R×67.98%mm; the installation angle of section VIII is -22.7°, the section height is R×145.21%mm, the maximum section thickness is R×1.43%mm, chord length is R×68.51%mm The installation angle is -28.2°, the section height is R×163.31mm, the maximum section thickness is R×0.87%mm, and the chord length is R×67.48%mm; the installation angle of section IX is -30.1°, the section height is R×172.36%mm, the maximum section thickness is R×0.72%mm, and the chord length is R×66.98%mm; the installation angle of section X is -31.1°, the section height is R×177.83%mm, the maximum section thickness is R×0.70%mm, and the chord length is R×66.75%mm.

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