Large axial flow fan air inlet box
By introducing cone section I and cone section II into the intake box of a large axial fan, the characteristic angles are designed to be 135° and 105°, the vortex problem at the air flow corner is solved, the smooth transition of the air flow is achieved, and the energy utilization efficiency of the fan is improved.
Patent Information
- Application Number
- CN202422435898.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-09
- Publication Date
- 2025-07-29
- Estimated Expiration
- 2034-10-09
AI Technical Summary
The intake box of a large axial fan is prone to form vortex at the air flow corner, resulting in energy loss and reduced fan efficiency.
A large axial flow fan intake box is designed, including cone section I and cone section II, with a characteristic angle α of 135° and β of 105°, so that the airflow gradually transitions smoothly in the intake box, avoiding a sudden change in the 90° angle.
Reduces the chance of eddy current generation, reduces energy loss, and improves the efficiency of the fan.
Smart Images
Figure CN223164717U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of large axial flow fans, and particularly applies to an air inlet box of a large axial flow fan. Background Art
[0002] With the rapid development of the fan industry, large axial flow fans are widely used as forced draft fans, induced draft fans, and primary fans in power plants, as well as booster fans used in flue gas desulfurization. The motors equipped with large axial flow fans are all relatively large, and the motors can only be externally placed outside the fans and penetrate into the fans through long shafts from the air inlet boxes to drive the rotors to rotate. This results in the fact that the fans cannot intake air horizontally and exhaust air horizontally, the air intake direction and the exhaust air direction of the fans form a 90° angle, and the conversion of the air flow direction of the fans is usually completed in the air inlet box. The air inlet boxes of most domestic fan factories have right-angle turns at the air flow turning points and do not set transition sections, which causes the air flow of the fans to form eddy currents at the right-angle turns, resulting in energy loss and reduced fan efficiency. Summary of the Utility Model
[0003] The purpose of the utility model is to overcome the above defects and provide an air inlet box of a large axial flow fan to reduce the energy loss of the air flow of the fan at the turning point.
[0004] The technical solution of the utility model: An air inlet box of a large axial flow fan, characterized in that: the air inlet box of the large axial flow fan includes an air inlet, a box body, a first conical section, a second conical section, and an air outlet. The air inlet is arranged at the upper part of the box body, the first conical section is arranged on the right side of the box body, the second conical section is arranged on the right side of the first conical section, the air outlet is arranged on the right side of the second conical section. The first conical section is provided with a characteristic angle α, and the second conical section is provided with a characteristic angle β. The α is 135°, and the β is 105°.
[0005] The beneficial effect of the utility model lies in that: the air inlet box of the large axial flow fan is provided with the first conical section and the second conical section, so that the air flow will sequentially pass through the first conical section and the second conical section and then enter the air outlet after entering the box body from the air inlet. When the air flow turns in the air inlet box, it can gradually and smoothly transition, reducing the probability of generating eddy currents, reducing energy loss, and improving the fan efficiency. Brief Description of the Drawings
[0006] Figure 1 It is a schematic structural diagram of the utility model.
[0007] Figure 2 It is a partial enlarged view of the schematic structural diagram of the utility model.
[0008] In the drawings, the corresponding technical features are marked as follows:
[0009] 1 - box body, 2 - air inlet, 3 - first conical section, 4 - second conical section, 5 - air outlet, 6 - characteristic angle α, 7 - characteristic angle β. Detailed implementation mode
[0010] The present utility model will be further described below in conjunction with the accompanying drawings and embodiments.
[0011] As Figure 1 As shown in Figure 1 or 2, when implementing the present utility model, first make the box body (1), then open an air inlet (2) at the upper part of the box body (1), and then sequentially make a conical section I (3) and a conical section II (4) at the right part of the box body (1). When making the conical section I (3), it is necessary to ensure that the characteristic angle α (6) is 135°, and when making the conical section II (4), it is necessary to ensure that the characteristic angle β (7) is 105°. Finally, open an air outlet (5) on the right side of the conical section II (4). Practical use shows that after the air flow enters the air inlet (2), it sequentially passes through the box body (1), the conical section I (3), the conical section II (4), and the air outlet (5). When the air flow turns, it smoothly transitions, without a 90° sudden turning angle, reducing the probability of vortex generation, reducing the energy loss of the fan, and improving the efficiency of the fan.
Claims
1. An air inlet box of a large axial flow fan, characterized in that: The described large axial flow fan inlet box includes an air inlet, a box body, a first conical section, a second conical section, and an air outlet. The air inlet is arranged at the upper part of the box body. The first conical section is arranged on the right side of the box body. The second conical section is arranged on the right side of the first conical section. The air outlet is arranged on the right side of the second conical section. The first conical section is provided with a characteristic angle α, and the second conical section is provided with a characteristic angle β. The α is 135°, and the β is 105°.