A kind of couple-stage axial-flow fans
Technical field
The utility model relates to a kind of axial-flow blower, and a kind of couple-stage axial-flow fans of more specifically saying so is applicable to the axial-flow blower of elevated pressures to belong to blower fan and ventilating engineering technical field.
Background technique
According to the development trend of ventilating engineering, the underground systems engineering of each big and medium-sized cities is more and more, grades as the underground part of various subways, tall building.These underground systems engineering spaces are more and more huger, and structure also becomes increasingly complex, wherein axial-flow blower in ventilation system in occupation of consequence.Because these huge and complicated underground systems engineerings have and are based upon underground particularity, for ensureing the reasonable disposition of these underground systems engineering ventilation systems, ventilation system have been proposed the requirement of high pressure and compact structure.
Existing situation generally adopts the rotating speed that increases blower fan or increases the demand that the blower fan model reaches elevated pressures.But, no matter take the sort of way all can produce different drawbacks, not that to have increased physical dimension be exactly to have influenced not matching of pressure and flow, caused waste.
The model utility content
At above-mentioned situation, the problem that the utility model quasi-solution is determined provides a kind of couple-stage axial-flow fans that had not only had elevated pressures coefficient but also compact structure, to satisfy the requirement of underground systems engineering ventilation system, and simultaneously can build-up of pressure and the unmatched waste of flow.
For achieving the above object, the utility model is by the following technical solutions: a kind of couple-stage axial-flow fans, comprise air duct, impeller, motor and stator in described air duct, the two ends of described motor have output shaft, described impeller is included as impeller one and impeller two, and described impeller one, impeller two are separately fixed on the output shaft at motor two ends.
Described impeller one can be axial-flow blower or mixed flow impeller or diagonal impeller; Described impeller two also can be axial-flow blower or mixed flow impeller or diagonal impeller.Described stator is between impeller one, impeller two.
Adopt such scheme, couple-stage axial-flow fans of the present utility model has two impellers, and the blower pressure that is produced is the pressure sum that both stage impellers produces, and the flow of both stage impellers is close, and the total discharge of blower fan and the flow of both stage impellers are also close.Blower fan passes through the adjustment of the stator of special construction between the both stage impellers to first order impeller outlet air-flow and second level impeller inlet air-flow, makes air-flow keep smooth and easy in whole blower fan.Single shaft, single action power couple-stage axial-flow fans in improvement project, have improved the pressure of blower fan and the flow of blower fan is constant by both stage impellers, and both stage impellers is installed on same the motor, has simplified the structure of blower fan.The utility model compact structure, theory uniqueness, modern design.
Description of drawings
Fig. 1 is the structural representation of the utility model couple-stage axial-flow fans.
Among the figure: 1-air duct, 2-stator, 3-motor, 4-output shaft, 5-impeller one, 6-impeller two
Embodiment
As shown in the figure, couple-stage axial-flow fans of the present utility model comprises air duct 1, impeller, motor 3 and stator 2 in described air duct 1, and said structure and prior art are similar, therefore are not described in detail here.
The characteristics of couple-stage axial-flow fans of the present utility model are: the two ends of described motor 3 have output shaft 4, and described impeller is included as impeller 1 and impeller 26, and described impeller 1, impeller 26 are separately fixed on the output shaft 4 at motor two ends.Described impeller 1 can be axial-flow blower or mixed flow impeller or diagonal impeller (Fig. 1 is example with the axial-flow blower).Described impeller 26 is axial-flow blower or mixed flow impeller or diagonal impeller (Fig. 1 is example with the axial-flow blower).Described stator 2 is between impeller 1, impeller 26.