Fluid reaction surfaces (i.e. – impellers) – Articulated – resiliently mounted or self-shifting impeller... – Nonmetallic resilient mounting
Patent
1991-08-05
1993-05-04
Look, Edward K.
Fluid reaction surfaces (i.e., impellers)
Articulated, resiliently mounted or self-shifting impeller...
Nonmetallic resilient mounting
416135, 416500, F04D 2920, F04D 2966
Patent
active
052075613
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Technical Field
The present invention relates to a device for assembling or coupling an impeller upon a driving shaft.
2. Discussion of Background
The torque delivered by motors typically is not constant, but rather varies or pulses. The variation or pulsation of the torque is accentuated if a speed controller is incorporated into the driving system, for example in driving an impeller. Such driving systems can include, for example, electric motors having frequency converters or electronic variators, or diesel motors.
The pulsating torques often give rise to resonance vibrations in various parts of the machine. For example, the impeller blades may be subjected to resonance vibrations and such vibrations may result in premature fatigue failure in one or more parts of the machine. In the past, this problem has been solved by introducing an adapted elastic or resilient coupling between the driving shaft of the motor and the impeller shaft. Such an arrangement is shown in FIG. 1 in the environment of a fan. In this arrangement, an elastic coupling shown at 20 is provided between the driving shafts 21 of the motor 22 and the fan shaft 24 which supports the fan impeller 26. The fan shaft 24 is carried by separate bearings 28, 30. Although this solution protects the fan from pulsating torques of the motor, the arrangement is expensive and involves large space requirements. As a result, such an arrangement is unsuitable for a number of applications.
SUMMARY OF THE INVENTION
In view of the foregoing, it is an object of the present invention to provide a solution to the above problems which relating to pulsating torques. More particularly, in accordance with the present invention, pulsating torques may be accommodated by an improved coupling or assembly device which does not require unduly burdensome space and cost requirements.
In accordance with the present invention, pulsating torques are eliminated or reduced, with the construction also applicable to situations in which the impeller is directly supported by the driving shaft of the motor. Thus, the need for an elastic resilient coupling between separate driving and impeller shafts is eliminated. As a result, the construction is simpler and less expensive. Furthermore, the construction is compact, with the space requirements considerably reduced as compared with prior art solutions, which can be particularly important in certain fan applications. According to one aspect of the invention, the device is disposed within the hub of the impeller, thereby providing a particularly compact design.
BRIEF DESCRIPTION OF THE DRAWINGS
Other objects and advantages of the present invention will become readily apparent from the following detailed description, particularly when read in conjunction with the drawings in which:
FIG. 1 is a side partial cross sectional view of a prior art device for protecting a fan against pulsating torques;
FIG. 2 illustrates a compact assembly of a drive motor and fan to which the present application is applicable;
FIG. 3 is a cross section of a fan impeller hub in accordance with an embodiment of the present invention; and
FIG. 4 illustrates an alternate embodiment of the present invention in which an elastic or resilient coupling is utilized.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
FIG. 2 illustrates a compact assembly in which a fan impeller 32 is directly supported by the driving shaft of a motor 34. As is readily apparent, the arrangement of FIG. 2 is much more compact than that of FIG. 1 and, in accordance with the present invention, such a compact arrangement can be maintained while undesirable effects of torque pulsations are avoided.
Referring now to FIG. 3, an embodiment of the assembly or coupling of the present invention is shown installed in an assembly of the type shown in FIG. 2. As will be readily apparent, the arrangement of the present invention provides for protection of the fan from pulsating torques from the drive motor by dampening and filtering the pulsations such that reson
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patent: 4826404 (1989-05-01), Zwicky
ABB Flakt AB
Lee Michael S.
Look Edward K.
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