Axial flow fan and air valve thereof as well as cooling tower and air cooler

Abstract

The invention discloses an air valve for an axial flow fan, the axial flow fan with the air valve and a cooling tower or an air cooler with the axial flow fan. The disclosed air valve for the axial flow fan comprises a valve body and a plurality of blades, wherein each blade comprises a blade shaft and a main blade; the inner edges of the main blades are fixed with the blade shafts; the valve body comprises an outer barrel and a central seat which are relatively fixed, and the central seat is arranged in the outer barrel; the outer end and the inner end of the blade shaft are respectively and rotatably arranged on the outer barrel and the central seat; and the plurality of blades are radially distributed on the periphery of the central seat. In the disclosed air valve for the axial flow fan, the blades can be matched with the pressure distribution of an air outlet of the axial flow fan, the blade arrangement area corresponds to a positive pressure air exhaust area of the air outlet, and the opening degree of each blade can be better matched with the pressure of the area to reduce the air exhaust resistance of the air outlet so as to reduce the vibration of the blades, lower the noise and the opening pressure of the air valve and improve the working reliability of the air valve.

Description

technical field [0001] The present invention relates to a fan technology, in particular to a damper for an axial fan, an axial fan with the damper, a cooling tower with the axial fan and a cooling tower with the axial fan. air cooler with fan. Background technique [0002] Axial flow fans are one of the most widely used fans at present. The axial flow fan mainly includes a fan body and an impeller. The casing generally has a cylindrical structure to form an air outlet, and the impeller is installed in the air outlet; the impeller can rotate in the air outlet under the drive of an appropriate power mechanism, and the gas enters from the front end of the air outlet. Finally, energy can be obtained through the rotating impeller, the pressure and flow rate increase, and then it is discharged from the rear end of the air outlet to realize the flow of air. [0003] At present, many devices need to be equipped with axial flow fans, and the operating state of the axial flow fans i...

AI Technical Summary

Problems solved by technology

At the same time, the band-distributed airflow will also generate friction, thereby increasing the exhaust resistance of the air outlet.

[0014] In addition, because each blade has a wind guiding effect when it is opened, the airflow passing through the front of each blade will generate a certain pressure on the reverse side of the front blade; thus, there is a positive and reverse pressure between each blade. , which also affects the discharge of the airflow, increasing the exhaust resistance of the air outlet

[0015] When the stroke link mechanism is set to ensure that the strokes of each blade are consistent, although the opening angle of each blade can be basically consistent, but also because the force of each blade is not the same, the opening angle of each blade will not be consistent with the airflow pressure in the predetermined area. Matching, there is also the problem of large exhaust resistance at the air outlet

[0016] Due to the large air exhaust resistance at the air outlet, not only will the blades vibrate, which will cause a lot of noise; it will also increase the opening pressure of the air valve, and when the air pressure at the air outlet is low, the air valve cannot be guaranteed to open with the fan running , reducing the reliability of fan operation

[0017] In addition, the current blades are flat blades. When the air valve is arranged horizontally and the opening angle is 90 degrees, the gravity of the blade and the axis of the rotating shaft cannot form a moment, and it is difficult to meet the needs of the air valve to automatically close.

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