Upblast Exhaust Apparatus With A Variable Outlet Nozzle

a technology of exhaust apparatus and variable outlet nozzle, which is applied in the direction of machines/engines, stators, liquid fuel engines, etc., can solve the problems of high noise levels, and achieve the effect of increasing the velocity of the air being discharged, increasing the velocity of the discharge, and increasing the velocity

Inactive Publication Date: 2013-11-28
MPC INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention is a nozzle that increases the speed of air being released into the atmosphere. By increasing the area of the nozzle, the air velocity decreases and less energy is required to move the air. This results in energy savings and the ability to maintain the minimum velocity required to prevent the need for additional bypass air.

Problems solved by technology

Conventional exhaust fans for moving large volumes of air often generate high levels of noise which is undesirable.

Method used

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  • Upblast Exhaust Apparatus With A Variable Outlet Nozzle
  • Upblast Exhaust Apparatus With A Variable Outlet Nozzle
  • Upblast Exhaust Apparatus With A Variable Outlet Nozzle

Examples

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Embodiment Construction

[0018]Referring to FIG. 1, a radial upblast exhaust apparatus includes a mixing plenum 10 that sits below the fan housing 14. The mixing plenum 10 has a fan inlet 12 to receive air from the building ductwork 13 to be exhausted. A nozzle / windband assembly 16, from which the air is exhausted, is positioned immediately above the fan housing. A wind band 19 increases the dilution of the exhaust air.

[0019]Referring to FIGS. 2 and 3, nozzle / windband assembly 16 includes two nozzle halves, 18 and 20, each shaped as a partial conical section. Nozzle sections 18 and 20 are concave toward each other and are spaced from one another.

[0020]The nozzle sections 18 and 20 each include an inner wall 21 and an outer wall 22. The inner wall 21 has flexible panels 21a, 21b, 21c, 21d which are movable about an axis to change the outlet area of the outlet nozzle. The flexible panels form the inner walls of each of the nozzle sections. Flexible panels 21a, 21b, 21c, 21d move in unison as a drive mechanism...

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Abstract

A radial upblast exhaust apparatus includes a fan housing having a fan inlet to receive air to be exhausted and a fan outlet to expel air to be exhausted. An upper housing is positioned immediately above the fan housing. It includes a first wall section and a second wall section each shaped as a partial conical section being concaved toward each other. The upper housing forms an air outlet nozzle. A mechanism changes the outlet area of the outlet nozzle in order to provide a variable area outlet for the fan.

Description

CROSS-REFERENCED TO RELATED APPLICATION[0001]This application claims the benefit of U.S. Provisional Application No. 60 / 875,902, which was filed on De. 20, 2006, which is incorporated herein by reference in its entirety.FIELD OF THE INVENTION[0002]This invention relates to exhaust fans, and more particularly to an upblast exhaust fan which has an outlet nozzle having a variable outlet area.BACKGROUND OF THE INVENTION[0003]Conventional exhaust systems typically have a fan with a stack or nozzle for pulling a gas out of the interior of a building and then increasing the velocity of the exiting air in order to properly dispel the air and also to avoid re-entrainment of the discharged air. In this regard, reference is made to U.S. Pat. No. 4,806,076, issued to Andrews, and U.S. Pat. No. 5,439,349, issued to Kupferberg, which are designed to provide a high velocity jet for exhausting atmosphere and other gases. These exhaust fans are typically mounted on the roof of buildings and are use...

Claims

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Application Information

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Patent Type & AuthorityApplications(United States)
IPC IPC(8): F04D29/40
CPCF04D29/701F24F13/10
InventorGANS, CHARLES A.TETLEY, PAUL A.
OwnerMPC INC