COUNTER-ROTATING AXIAL AIR MOVING DEVICE STRUCTURE
A counter rotating axial air moving device structure is disclosed. The rear rotor includes a rear hub and rear blades, and a pitch angle of each of the rear blades increases gradually in a direction away from the rear hub. The front rotor, the rear rotor and the stator component are stacked with each other. The ratio of the thickness to the diameter is equal to or greater than about 0.25 and equal to or less than about 0.8. Therefore, a better performance curve is obtained, and the vibration and noise are avoided.
The technical field relates to an axial air moving device, and more particularly relates to a counter-rotating axial air moving device structure.
Description of Related ArtPlease refer to
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In the design of the counter-rotating axial air moving device of the related art, the pitch angles of blades are varied as above description. The pitch angles of the front and rear blades both decrease gradually from the position near the hub in a direction away from the hub. However, the thin type counter-rotating axial air moving devices of the related art cannot withstand the high back pressure, and the performance may be significantly reduced. As a result, the rotation speed of the thin type counter-rotating axial air moving device of the related art must be increased to compensate for the performance, and the consequences of the deterioration of vibration and noise of the axial air moving device and the increasing of energy consumption arise.
SUMMARY OF THE DISCLOSUREOne object of this disclosure is to provide a thin type counter-rotating axial air moving device structure having a performance curve with the better characteristic of the static pressure versus air flowrate at the same rotation speed, so as to avoid the vibration and noise being deteriorated by keeping the rotation speed, and the energy consumption is also controlled.
In order to achieve the object mentioned above, this disclosure provides a counter-rotating axial air moving device structure that includes a front rotor and a rear rotor. The rear rotor is disposed on a downstream side of the front rotor and receives a forced air flow generated from the front rotor. The rear rotor includes a rear hub and a plurality of rear blades arranged on a periphery of the rear hub. A pitch angle of each of the rear blades increases gradually in a direction away from the rear hub. The front rotor and the rear rotor are stacked with each other to have a total thickness and a diameter, and a ratio of the total thickness to the diameter is equal to or greater than about 0.25 and equal to or less than about 0.8.
Comparing with the related art, the pitch angle of the rear rotor blades in this disclosure increases gradually from the inner side to the outer side. With such configuration, the counter-rotating axial air moving device structure of this disclosure has a performance curve with the better characteristic of the static pressure versus air flowrate at the same rotation speed. Therefore, the deterioration of vibration and noise may be avoided by keeping the rotation speed, and the energy consumption is also controlled.
The features of the disclosure believed to be novel are set forth with particularity in the appended claims. The disclosure itself, however, may be best understood by reference to the following detailed description of the disclosure, which describes a number of exemplary embodiments of the disclosure, taken in conjunction with the accompanying drawings, in which:
The technical contents of this disclosure will become apparent with the detailed description of embodiments accompanied with the illustration of related drawings as follows. It is intended that the embodiments and drawings disclosed herein are to be considered illustrative rather than restrictive.
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In this embodiment, the stator component 30 includes a plurality of stator blades. The stator blades are arranged to recover the rotational kinetic energy of the air flow passing the front rotor 10. It should be noted that in some embodiments, the counter-rotating axial air moving device structure 1 of this disclosure may not have the stator component 30.
Furthermore, the stator component 30 is optionally located on a front or rear side of the front rotor 10, on a rear side of the rear rotor 20 or between the front rotor 10 and the rear rotor 20. In some embodiments, the stator component 30 may include a plurality of pillars or a plurality of stator blades with wing sections, and the pillars or the stator blades are arranged radially corresponding to the rotor blade design.
In this embodiment, the front rotor 10, the rear rotor 20 and the stator component 30 are stacked with each other to have a total thickness T and a diameter D. The ratio of the total thickness T to the diameter D is equal to or greater than about 0.25 and equal to or less than 0.8. That is, the counter-rotating axial air moving device structure 1 is considered a relatively thin type of counter-rotating axial air moving device.
Specifically, the hub diameter d and the rotor diameter D of the front rotor 10 are the same with the hub diameter d and the rotor diameter D of the rear rotor 20 respectively (equivalent to the diameter D). The ratio of the hub diameter d to the rotor diameter D is between about 0.15 and about 0.75. Moreover, the ratio of the rotation speed of the rear rotor 20 to the rotation speed of the front rotor is equal to or greater than about 0.5 and equal to or less than about 1.2.
The main feature of the counter-rotating axial air moving device structure 1 of this disclosure is the design of the pitch angles of the blades of the rear rotor 20. The detailed description is as follows.
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While this disclosure has been described by means of specific embodiments, numerous modifications and variations could be made thereto by those skilled in the art without departing from the scope and spirit of this disclosure set forth in the claims.
Claims
1. A counter-rotating axial air moving device structure, comprising:
- a front rotor; and
- a rear rotor, disposed on a downstream side of the front rotor and receiving a forced air flow generated from the front rotor, the rear rotor comprising a rear hub and a plurality of rear blades arranged on a periphery of the rear hub, and a pitch angle of each of the rear blades increasing gradually in a direction radially away from the rear hub;
- wherein, the front rotor and the rear rotor are stacked with each other to comprise a total thickness and a diameter, and a ratio of the total thickness to the diameter is equal to or greater than about 0.25 and equal to or less than about 0.8.
2. The counter-rotating axial air moving device structure according to claim 1, wherein the front rotor and the rear rotor rotate in opposite directions.
3. The counter-rotating axial air moving device structure according to claim 1, wherein a hub diameter and a rotor diameter of the front rotor are the same with a hub diameter and a rotor diameter of the rear rotor respectively, and a ratio of the hub diameter to the rotor diameter is between about 0.15 and about 0.75.
4. The counter-rotating axial air moving device structure according to claim 1, wherein a ratio of a rotation speed of the rear rotor to a rotation speed of the front rotor is equal to or greater than about 0.5 and equal to or less than about 1.2.
5. The counter-rotating axial air moving device structure according to claim 1, further comprising a stator component, optionally located on a front or rear side of the front rotor, on a rear side of the rear rotor or between the front rotor and the rear rotor; and the front rotor, the rear rotor and the stator component are stacked with each other to comprise the total thickness and the diameter, and the ratio of the thickness to the diameter is equal to or greater than about 0.25 and equal to or less than about 0.8.
6. The counter-rotating axial air moving device structure according to claim 5, wherein the stator component comprises a plurality of pillars or a plurality of stator blades, and the pillars or the stator blades are arranged radially.
Type: Application
Filed: Apr 16, 2021
Publication Date: Oct 20, 2022
Inventor: Yih-Wei TZENG (Taoyuan City)
Application Number: 17/233,425