Pivotal direct drive motor for exhaust assembly

a direct drive, exhaust technology, applied in the direction of lighting and heating apparatus, ventilation systems, heating types, etc., can solve the problems of difficult maintenance, inability to adapt to meet a wide range of performance specifications, and high cost of building exhaust stacks

Inactive Publication Date: 2005-07-21
GREENHECK FAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0006] In accordance with another aspect of the invention, an exhaust assembly is mounted onto a roof of a building for removing contaminated air from one or more building exhaust vents. The exhaust assembly includes an air inlet receiving the contaminated air, at least one ambient air entrainment zone mixing ambient air with the contaminated air to produce diluted air, and an air outlet exhausting the diluted air. A fan is coupled to a fan shaft to draw the contaminated air through the air inlet and blow it towards the air outlet. A pivotally mounted motor drives a motor shaft that is removably coupled to the fan shaft.

Problems solved by technology

In building such as laboratories, fumes are produced by chemical and biological processes, which may have an unpleasant odor, is noxious or toxic.
Such exhaust stacks, however, are expensive to build and are unsightly.
Unfortunately, prior systems are expensive, difficult to maintain and not easily adaptable to meet a wide range of performance specifications.

Method used

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  • Pivotal direct drive motor for exhaust assembly
  • Pivotal direct drive motor for exhaust assembly
  • Pivotal direct drive motor for exhaust assembly

Examples

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second embodiment

[0072] Referring particularly to FIGS. 16 and 17, an alternative embodiment of the invention is substantially the same as the preferred embodiment described above except the nozzle end of the fan assembly 46 is modified to add an additional, second nozzle assembly 50. In this second embodiment the outer wall 100 of the fan assembly is tapered radially inward at its upper end to form a first nozzle 53 with the inner wall 106 which extends straight upward, beyond the nozzle 53. The second nozzle assembly 50 is a frustum-shaped element which is fastened to the extended portion of the inner wall 106 by brackets 55. It is flared around its bottom end to form an inlet bell 57 similar to that on the windband 52. The second nozzle assembly 50 is concentric about the inner wall 106, and its top end is coplanar with the top end of the inner wall 106 to form an annular-shaped second nozzle 59 therebetween. Brackets 61 fasten around the perimeter of the second nozzle assembly 50 and extend upwa...

first embodiment

[0073] Referring particularly to FIG. 17, the annular space between the lower end of the second nozzle assembly 50 and the outer wall 100 forms a first gap through which ambient air enters as indicated by arrows 63. This air is entrained with the swirling exhaust air exiting the first nozzle 53 to dilute it. Similarly, the annular space between the lower end of the windband 52 and the second nozzle assembly 50 forms a second gap through which ambient air enters as indicated by arrows 65. This air is entrained with the once diluted exhaust air exiting the second nozzle 59 to further dilute the exhaust. As with the first embodiment, further ambient air which enters through the passageways and flows out the top end of the inner wall 106 as shown in FIG. 16 by arrow 67 also dilutes the exhaust before it is expelled at high velocity out the exhaust outlet at the top of the windband 52.

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PUM

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Abstract

An exhaust assembly is provided for expelling contaminated air from a building. The assembly includes a plenum, a fan assembly attached to the plenum, and a windband mounted on top of the fan assembly. The fan assembly is constructed of cylindrical outer and inner walls which define a drive chamber and surrounding annular space. A fan driven by a motor whose shaft extends downward from the drive chamber draws exhaust air from the plenum and blows it up through the annular space to a nozzle at the top of the fan assembly. The motor is pivotally mounted inside the assembly to provide access to the motor components when it is desired to perform inspection and maintenance.

Description

CROSS REFERENCE TO RELATED APPLICATIONS [0001] This claims the benefit of U.S. Provisional Patent Application No. 60 / 537,609 filed Jan. 20, 2004 and further claims the benefit of U.S. Provisional Patent Application No. 60 / 558,074 filed Jul. 15, 2004, the disclosure of each of which is hereby incorporated by reference as if set forth in their entirety herein.BACKGROUND OF THE INVENTION [0002] The present invention relates generally to exhaust fans, and more particularly to exhaust fans of the type that draw contaminated air from one or more fume hoods dispersed throughout a building, mix the contaminated air with ambient air to dilute the contaminants, and vent the diluted air from the building into the ambient environment. [0003] There are many different types of exhaust systems for buildings. In most of these the objective is to simply draw air from inside the building in an efficient manner. In building such as laboratories, fumes are produced by chemical and biological processes,...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F04D25/02F24F7/02
CPCF24F7/025F04D25/02
Inventor HRDINA, TERRY LEEKOEPPEL, SCOTT JAMESSELIGER, MICHAEL GLENN
Owner GREENHECK FAN
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