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Back draft damper

a damper and back draft technology, applied in ventilation systems, lighting and heating apparatus, heating types, etc., can solve the problems of reducing the overall efficiency of the system, causing excess drag, and affecting the airflow, and achieve the effect of less force and more airflow

Inactive Publication Date: 2011-02-03
CES GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

"The invention is a back draft damper that has vanes that rotate to their closed positions when there is a small amount of gravity force acting on them. This means that the vanes can open more quickly and with less force than vanes that rotate about horizontal axes. The technical effect of this design is that it allows for quicker and easier opening of the damper without requiring excessive force."

Problems solved by technology

However, the down side of this is that it takes a considerable amount of airflow to fully open the vanes and if the airflow is to low to fully open the vanes they will create excess drag and overall efficiency of the system is reduced.
While the gravity effect on damper vanes that rotate about horizontal axes can be reduced by counter weighting the vanes in some manner, this adds to the cost and in many situations the counter weighting has to be customized.

Method used

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Examples

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Embodiment Construction

[0015]Referring to FIG. 1 of the drawings, a back draft damper comprises a shell 10 which defines a central opening 12 having an inlet 11 and an outlet 13 through which air passes. The shell is constructed to fit into a duct or passageway (not shown) through which air flows, or be placed immediately upstream or downstream of a fan unit (not shown). The size of the shell depends upon the size of the duct, passageway or fan unit. In the preferred embodiment illustrated, which is sized for fans in a multiple fan array, the shell is 27″×27″ and has a depth of 8″. The shell is constructed of 16 gauge sheet metal and has a lip 14 located at its outlet which engages an optional egg crate flow straightener 16. The shell 10 has a top 18, bottom 19 and sides 20. The shell can be rectangular, as shown in FIGS. 1 and 2 or elliptical as shown in FIG. 9. The shell can be fabricated from many types of materials and have different dimensions based on the particular application.

[0016]A plurality of ...

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PUM

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Abstract

A back draft damper includes a rectangular shell having a central opening which air can pass through. A plurality of vanes rotatably mounted in the shell are rotatable between open positions where air can pass through the shell and closed positions where air cannot pass through the shell. The axes the vanes rotate about are slightly offset from vertical.

Description

BACKGROUND OF THE INVENTION[0001]Large air handling systems often require back draft dampers to be placed at critical locations to prevent air from flowing in the direction opposite normal air flow when the fan that is creating the airflow is not operating. This is particularly true with multi-fan systems such as shown in Hopkins, U.S. Pat. Nos. 7,137,775 and 7,727,468. With multi-fan systems it is common to shut off one or more of the fans to allow the remaining fans to run at peak efficiency. When this occurs some air from the operating fans will flow back through the non-operating fans if the non-operating fans do not have back draft dampers.[0002]There basically are three types of back draft dampers: manual systems where a blank off plate or damper is deployed to prevent reverse airflow; remotely actuated dampers where actuators are used to close a damper; and gravity actuated dampers where the damper is opened by the pressure of air passing through it and is closed by the force...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F24F13/14
CPCF24F13/1426F24F13/1413
Inventor HOPKINS, LAWRENCEJONES, EMILYPASSADORE, ALBERTBENSON, DAVID
Owner CES GRP