U.S. patent application number 11/336386 was filed with the patent office on 2007-07-26 for small duct high velocity damper assembly.
This patent application is currently assigned to Arzel Technology, Inc.. Invention is credited to Alexander Avruschenko, Thomas Delp, Dennis Laughlin, Joseph Ramunni, Leonard Roth, Vladimir Sipershteyn, Mark Votaw, Al Zelczer.
Application Number | 20070173192 11/336386 |
Document ID | / |
Family ID | 38287997 |
Filed Date | 2007-07-26 |
United States Patent
Application |
20070173192 |
Kind Code |
A1 |
Votaw; Mark ; et
al. |
July 26, 2007 |
Small duct high velocity damper assembly
Abstract
A SDHV damper assembly and methods to assemble and install the
SDHV damper assembly are disclosed. The SDHV damper assembly
includes a first damper housing half comprising a substantially
cylindrical tube having a first open end and a second open end. The
SDHV damper assembly further includes a second damper housing half
comprising a substantially cylindrical tube having a first open end
and a second open end. The first open end of the second damper
housing half is joined to the first open end of the first damper
housing half to form an assembled damper housing. A substantially
elliptical damper blade is pivotally mounted within the assembled
damper housing along a minor axis of the damper blade. An actuator
member is pivotally connected to a first side of the damper blade
near a first end of the actuator member. The actuator member
extends through an opening in the assembled damper housing and
connects to a driving element of a damper actuator at a second end
of the actuator member.
Inventors: |
Votaw; Mark; (North Canton,
OH) ; Ramunni; Joseph; (Wadsworth, OH) ; Delp;
Thomas; (Aurora, OH) ; Laughlin; Dennis;
(Chardon, OH) ; Zelczer; Al; (University Heights,
OH) ; Roth; Leonard; (University Heights, OH)
; Sipershteyn; Vladimir; (Independence, OH) ;
Avruschenko; Alexander; (Reminderville, OH) |
Correspondence
Address: |
HAHN LOESER & PARKS, LLP
One GOJO Plaza
Suite 300
AKRON
OH
44311-1076
US
|
Assignee: |
Arzel Technology, Inc.
|
Family ID: |
38287997 |
Appl. No.: |
11/336386 |
Filed: |
January 20, 2006 |
Current U.S.
Class: |
454/256 |
Current CPC
Class: |
F24F 13/14 20130101;
F24F 2013/1466 20130101 |
Class at
Publication: |
454/256 |
International
Class: |
F24F 11/00 20060101
F24F011/00 |
Claims
1. A damper assembly for controlling the flow of fluid through
small duct high velocity (SDHV) ductwork, said damper assembly
comprising: a first damper housing half comprising a substantially
cylindrical tube having a first open end and a second open end; a
second damper housing half comprising a substantially cylindrical
tube having a first open end and a second open end wherein said
first open end of said second damper housing half is joined to said
first open end of said first damper housing half to form an
assembled damper housing; a substantially elliptical damper blade
pivotally mounted within said assembled damper housing along a
minor axis of said damper blade for movement between opened and
closed positions; an actuator member having a first end and a
second end and being pivotally connected to a first side of said
damper blade near the first end of said member and extending
through an opening in said assembled damper housing toward the
second end of said member such that said damper blade pivots about
said minor axis when said actuator member is moved along a
longitudinal axis of said actuator member, said longitudinal axis
being substantially perpendicular to said minor axis; and a damper
actuator mounted to said assembled damper housing such that said
second end of said actuator member is connected to a driving
element of said damper actuator to move said actuator member
longitudinally when said damper actuator is driven by saiddriving
element.
2. The damper assembly of claim 1 wherein each of said damper
housing halves includes integral threads on an outside surface of
saidhousing halves.
3. The damper assembly of claim 1 wherein each of said damper
housing halves includes a joining flange on saidfirst open end of
each of said damper housing halves.
4. The damper assembly of claim 3 wherein said joining flange
includes axle receiver recesses to receive an axle of said damper
blade.
5. The damper assembly of claim 1 wherein said second damper
housing half is substantially identical to said first damper
housing half.
6. The damper assembly of claim 1 wherein said damper blade
includes an axle extending from two opposite edges of said damper
blade in line with said minor axis to allow said damper blade to
pivotally mount to said assembled damper housing via axle receiver
recesses in said assembled damper housing.
7. The damper assembly of claim 1 wherein said first side of said
damper blade includes at least one bracket extending from saidfirst
side of said damper blade such that said actuator member may be
pivotally connected to said damper blade via said at least one
bracket.
8. The damper assembly of claim 7 wherein a pin is used to secure
said actuator member to said at least one bracket by insertion of
said pin into a first hole through said actuator member and a
second hole through said at least one bracket.
9. The damper assembly of claim 1 wherein said damper blade
includes beveled edges to provide a tight fit between said edges
and an interior surface of said assembled damper housing when said
damper blade is in said closed position.
10. The damper assembly of claim 1 wherein said driving element
comprises a movable diaphragm which moves said actuator member
longitudinally when said damper actuator is pressure or vacuum
activated by an air pump.
11. A method of assembling a damper assembly used for controlling
the flow of fluid through small duct high velocity (SDHV) ductwork,
said method comprising: identifying component parts of said damper
assembly including a damper actuator having a damper actuator
housing and a protruding actuator member, a damper blade having an
axle and at least one bracket, a first damper housing half having a
first joining flange with first axle receiver recesses, and a
second damper housing half having a second joining flange with
second axle receiver recesses; pivotally securing said damper blade
to said actuator member via said at least one bracket on a back
surface of said damper blade; loosely securing said first damper
housing half to said damper actuator housing; aligning said axle of
said damper blade with said first axle receiver recesses in said
first joining flange of said first damper housing half; tightly
securing said second damper housing half to said first damper
housing half at said joining flanges such that said axle is also
aligned with said second axle receiver recesses in said second
joining flange of said second damper housing half; aligning said
loosely secured damper housing halves to said damper actuator
housing; and tightly securing said aligned damper housing halves to
said damper actuator housing.
12. The method of claim 11 wherein said damper blade is pivotally
secured to said actuator member by inserting a pin through a first
hole near a first end of said actuator member and through a second
hole of said at least one bracket.
13. The method of claim 11 wherein said first damper housing half
is loosely secured to said damper actuator housing by screwing a
first screw through a first hole in a base of said first damper
housing half and into a corresponding first hole in said damper
actuator housing.
14. The method of claim 11 wherein said second damper housing half
is secured to said first damper housing half via bolts and nuts,
said bolts passing through holes in said joining flanges.
15. The method of claim 13 wherein said first damper housing half
and said second damper housing half are tightly secured to said
damper actuator housing via said first screw and by screwing at
least one second screw through a second hole in a base of said
second damper housing and into at least one corresponding second
hole in said damper actuator housing.
16. The method of claim 11 wherein said aligning said loosely
secured damper housing halves to said damper actuator housing
includes lining up at least one screw hole in a base of said second
damper housing half with at least one screw hole in said damper
actuator housing.
17. The method of claim 11 wherein each of said damper housing
halves includes integral threads on an outside surface of said
housing halves.
18. The method of claim 11 wherein said second damper housing half
is substantially identical to said first damper housing half.
19. The method of claim 11 wherein said damper blade includes
beveled edges to provide a tight fit between said edges and an
interior surface of said damper housing halves when said damper
blade is in a closed position within said damper housing
halves.
20. The method of claim 11 wherein each of said damper housing
halves comprise a substantially cylindrical tube having a first
open end and a second open end and wherein said damper blade is
substantially elliptical in shape.
21. A method of installing a damper assembly, comprising a damper
housing connected to a damper actuator, and used for controlling
the flow of fluid through small duct high velocity (SDHV) flex line
duct work, said method comprising: making a cut through a
cross-section of said duct work to form two open sections of said
duct work; inserting a first open end of said damper housing into a
first open section of said two open sections of said duct work to
form a first joint; inserting a second open end of said damper
housing into a second open section of said two open sections of
said duct work to form a second joint; securing said first joint to
hold said first open end within said first open section; securing
said second joint to hold said second open end within said second
open section; sealing said first joint to form a first air tight
sealed joint; and sealing said second joint to form a second air
tight sealed joint.
22. The method of claim 21 further comprising connecting a first
end of an air supply line to an air inlet port of said damper
actuator.
23. The method of claim 22 further comprising wrapping said
installed damper assembly.
24. The method of claim 23 wherein standard duct wrap is used to
perform said wrapping.
25. The method of claim 21 wherein said inserting includes twisting
threaded open ends of said damper housing into said two open
sections of said duct work.
26. The method of claim 21 wherein said securing includes
tightening a heavy Nylon cable tie around said joints.
27. The method of claim 21 wherein air tight duct tape is used to
perform said sealing.
28. The method of claim 22 further comprising routing a second end
of said air supply line to a pressure/vacuum air pump and
connecting said second end of said air supply line to a port of
said pressure/vacuum air pump.
29. A damper for controlling the flow of a fluidized medium through
high velocity ductwork, the damper comprising: a substantially
tubular damper housing having first and second ends, wherein each
of the first and second ends is adapted for insertion into
associated high velocity ductwork respectively; a substantially
elliptical damper blade pivotally mounted within said damper
housing along a minor axis of said damper blade for movement
between opened and closed positions; an actuator member having a
first end and a second end and being pivotally connected to a first
side of said damper blade near the first end of said member and
extending through an opening in said damper housing toward the
second end of said member such that said damper blade pivots about
said minor axis when said actuator member is moved along a
longitudinal axis of said actuator member, said longitudinal axis
being substantially perpendicular to said minor axis; and a damper
actuator mounted to said damper housing such that said second end
of said actuator member is connected to a driving element of said
damper actuator to move said actuator member longitudinally when
said damper actuator is driven by said driving element.
30. A damper for controlling the flow of a fluidized medium through
high velocity ductwork, the damper comprising: a substantially
tubular damper housing having first and second ends, wherein each
of the first and second ends is adapted for insertion into
associated high velocity ductwork respectively; and a substantially
elliptical damper blade pivotally mounted within said damper
housing along a minor axis of said damper blade for movement
between opened and closed positions.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS/INCORPORATION BY
REFERENCE
[0001] U.S. Pat. No. 5,458,148, issued on Oct. 17, 1995, is
incorporated herein by reference in its entirety. Also, pending
U.S. patent application Ser. No. 11/226,165, filed on Sep. 14,
2005, is incorporated herein by reference in its entirety.
TECHNICAL FIELD
[0002] Certain embodiments of the present invention relate to
damper assemblies for heating venting and air conditioning (HVAC)
systems. More particularly, certain embodiments of the present
invention relate to a small duct high velocity (SDHV) damper
assembly and methods of assembling and installing the SDHV damper
assembly.
BACKGROUND OF THE INVENTION
[0003] Various types of damper devices have been developed over the
years to control the flow of fluid through ducts in low velocity
HVAC systems (i.e., provide zone control). The damper devices are
used to control the flow of air through the systems' air ducts and
range from a simple hand-turnable damper vane often found in
residential buildings to motor driven mechanical damper assemblies
more commonly used in commercial and industrial structures. Another
type of damper device employs an inflatable bladder or bellows to
control fluid flow through a duct, and details of particularly
useful bladder-type flow control devices and associated systems can
be found in U.S. Pat. Nos. 4,545,524, and 4,702,412. One advantage
of the bladder-type flow control devices shown in these patents is
that they could be easily retrofitted into existing ducts with
minimal difficulty.
[0004] Another prior art type of damper device for low velocity
HVAC systems is a mechanical damper assembly comprising a short
piece of metal duct in which a damper vane is provided with a shaft
that is pivotally mounted for rotation in the short piece of metal
duct. The damper vane is rotated between open and closed positions
by a motor mounted to and outside the duct piece and connected to
the damper vane shaft.
[0005] The aforesaid type of mechanical damper assembly is somewhat
difficult to install in an existing low velocity metal duct.
Installation requires the duct piece of the damper assembly to be
spliced into the existing low velocity duct. This involves cutting
out a length of the existing metal duct and usually dismantling of
the existing metal duct to enable such cutting and/or assembly of
the duct piece between adjacent sections of the existing duct. This
dismantling, cutting, and reassembling of the metal ductwork is
time consuming and, therefore, an expensive operation when
performed by paid installers.
[0006] The damper vanes in prior art mechanical damper assemblies
heretofore have been driven by both electric and fluid motors. A
drawback of electric damper motors is that often their life cycle
is comparatively short and limited, thereby making motor
replacement a relatively frequent and expensive maintenance
operation. Another problem is that, in systems employing a
considerable number of electric motor driven dampers, relatively
complicated wiring schemes and transformers are often involved, all
adding to the cost and complexity of the overall system. Fluid
motors eliminate the electrical wiring problems and often have
comparatively longer life cycles, but they too have had drawbacks
associated therewith. Even with so-called frictionless
diaphragm-type fluid motors, the actuator members thereof are
typically engaged by bearings and wipers that still hinder free
linear movement of the members. Also, to reduce friction, the
members are often made of hardened steel as opposed to less
expensive materials.
[0007] U.S. Pat. No. 5,458,148, which is incorporated herein by
reference, describes a fluid flow control damper assembly that
overcomes many of the drawbacks associated with the damper
assemblies described above herein. In this patent, a damper
assembly comprises a support base for external mounting to a side
of a duct. A damper vane is mounted to the support base for
movement between open and closed positions. The damper vane is
located inwardly of the inner side of the support base for
positioning interiorly of the duct when the support base is mounted
to the duct. An actuator is mounted to the support base and
operatively connected to the damper vane for moving the damper
between open and closed positions. The support base includes a
closure for closing an access opening in a side wall of the duct of
sufficient size to permit insertion of the damper vane
therethrough. The closure includes a mounting member and a gasket
at the inner side of the mounting member for providing a seal
between the mounting member and the side wall of the duct. The
actuator includes a fluid motor of the type including a diaphragm.
The damper vane may be pivotally mounted to the end of a mounting
post extending inwardly from the support base and the fluid motor
may have an actuator member connected to the diaphragm and
extending generally parallel to the mounting post for connection to
the damper vane.
[0008] For SDHV HVAC systems, zone control has been difficult and
largely impractical due to a lack of sufficient damper assemblies
designed for the unique properties and characteristics of SDHV HVAC
systems (e.g., higher air velocities and pressures than that of
traditional low velocity HVAC systems and smaller diameter duct
work, for example, 2 inch diameter duct work). Therefore, a need
exists for a damper assembly that may be used in SDHV HVAC
systems.
[0009] Further limitations and disadvantages of conventional,
traditional, and proposed approaches will become apparent to one of
skill in the art, through comparison of such systems and methods
with the present invention as set forth in the remainder of the
present application with reference to the drawings.
SUMMARY OF THE INVENTION
[0010] An embodiment of the present invention comprises a damper
assembly for controlling the flow of fluid through a duct. The
damper assembly includes a first damper housing half comprising a
substantially cylindrical tube having a first open end and a second
open end. The damper assembly further includes a second damper
housing half comprising a substantially cylindrical tube having a
first open end and a second open end wherein the first open end of
the second damper housing half is joined to the first open end of
the first damper housing half to form an assembled damper housing.
The damper assembly also includes a substantially elliptical damper
blade pivotally mounted within the assembled housing along a minor
axis of the damper blade for movement between opened and closed
positions. The damper assembly further includes an actuator member
having a first end and a second end and being pivotally connected
to a first side of the damper blade near the first end of the
member. The actuator member extends through an opening in the
assembled damper housing toward the second end of the member such
that the damper blade pivots about the minor axis when the actuator
member is moved along a longitudinal axis of the actuator member.
The longitudinal axis is substantially perpendicular to the minor
axis. The damper assembly also includes a damper actuator mounted
to the assembled damper housing such that the second end of the
actuator member is connected to a movable diaphragm of the damper
actuator to move the actuator member longitudinally when the damper
actuator is pressure or vacuum activated by an air pump.
[0011] A further embodiment of the present invention comprises a
method of assembling a damper assembly used for controlling the
flow of fluid through a duct. The method comprises identifying
component parts of the damper assembly including a damper actuator
having a damper actuator housing and a protruding actuator member,
a damper blade having an axle and at least one bracket, a first
damper housing half having a first joining flange with first axle
receiver recesses, and a second damper housing half having a second
joining flange with second axle receiver recesses. The method
further includes pivotally securing the damper blade to the
actuator member via the at least one bracket on a back surface of
the damper blade. The method also includes loosely securing the
first damper housing half to the damper actuator housing. The
method further includes aligning the axle of the damper blade with
the first axle receiver recesses in the first joining flange of the
first damper housing half. The method further comprises tightly
securing the second damper housing half to the first damper housing
half at the joining flanges such that the axle is also aligned with
the second axle receiver recesses in the second joining flange of
the second damper housing half. The method also includes aligning
the loosely secured damper housing halves to the damper actuator
housing and tightly securing the aligned damper housing halves to
the damper actuator housing.
[0012] Another embodiment of the present invention comprises a
method of installing a damper assembly, comprising a damper housing
connected to a damper actuator, and used for controlling the flow
of fluid through small duct high velocity (SDHV) flex line duct
work. The method includes making a cut through a cross-section of
the duct work to form two open sections of the duct work. The
method further includes inserting a first open end of the damper
housing into a first open section of the two open sections of the
duct work to form a first joint. The method also includes inserting
a second open end of the damper housing into a second open section
of the two open sections of the duct work to form a second joint.
The method further comprises securing the first joint to hold the
first open end within the first open section and securing the
second joint to hold the second open end within the second open
section. The method also includes sealing the first joint to form a
first air tight sealed joint and sealing the second joint to form a
second air tight sealed joint. The method further includes
connecting a first end of an air supply line to an air inlet port
of the damper actuator.
[0013] Like all air distribution systems, SDHV HVAC systems depend
on moving conditioned air to the living spaces to maintain a
desirable temperature in those spaces. The system is scaled and
laid out to deliver enough air to maintain the desired temperature
during peak load conditions. A problem is that peak conditions
occur during only about 10% of the annual duty cycle. During other
times, peak delivery will mean that some areas of the building will
be too warm while others will be too cool. Zoning combats such a
problem by serving only those areas that are demanding service
"right now". That is, when thermostats installed in those areas
call, air is provided. When the thermostats in certain zones are
not calling, the dampers are closed and the air is served somewhere
else.
[0014] In general SDHV HVAC systems tend to be much more expensive
than conventional HVAC systems and are installed in homes that have
architectural challenges that preclude standard duct work, or in
historical homes that were not designed for cooling and adding
conventional duct work. Because air is moved faster in a SDHV HVAC
system, the size of the duct work may be reduced. The trunk is
typically 6 to 10 inches wide, with 2 inch flexible duct runouts
feeding inconspicuous outlets. The small size of the runouts allows
contractors to run them inside standard stud walls or through
ceilings without having to build"ugly" sofits. An air pump in a
SDHV HVAC system may generate 40-60 inches of water column in
pressure and vacuum resulting in 1-2 inches of water column static
pressure inside the SDHV duct work. Airflow is typically around
2400 feet/minute in such SDHV HVAC systems.
[0015] It has traditionally been thought that SDHV HVAC systems
could not be zoned. Manufacturers have been concerned that raising
the static pressure, by closing zone dampers and reducing the
effective size of duct work, would cause a severe loss in airflow
through the equipment, thereby causing the equipment to become too
cold (during cooling) and freeze up. However, the damper assembly
as described herein allows for zoning of SDHV HVAC systems.
Contractors should follow the equipment manufacturers'
recommendations about the total number of runs throughout the
system but they should not have less than 3.5 outlets per ton of
cooling in any zone. This works well for refrigerant-based air
conditioning and heat pump systems. For systems using chillers or
boilers, there is no restriction on outlets.
[0016] These and other advantages and novel features of the present
invention, as well as details of illustrated embodiments thereof,
will be more fully understood from the following description and
drawings.
BRIEF DESCRIPTION OF SEVERAL VIEWS OF THE DRAWINGS
[0017] FIG. 1 illustrates a perspective view of an exemplary
embodiment of a damper assembly for use in a SDHV HVAC system, in
accordance with various aspects of the present invention.
[0018] FIG. 2 illustrates a side view of the damper assembly of
FIG. 1, in accordance with various aspects of the present
invention.
[0019] FIGS. 3a-3d illustrate several different views of the damper
assembly of FIG. 1, in accordance with various aspects of the
present invention.
[0020] FIGS. 4a-4c illustrate several component parts of the damper
assembly of FIG. 1, in accordance with various aspects of the
present invention.
[0021] FIG. 5 is a flow chart of an embodiment of a method of
assembling the damper assembly of FIG. 1, in accordance with
various aspects of the present invention.
[0022] FIG. 6 is a flow chart of an embodiment of a method of
installing the damper assembly of FIG. 1, in accordance with
various aspects of the present invention.
[0023] FIG. 7 is an illustration showing the damper assembly of
FIG. 1 installed between two sections of SDHV flex line duct work,
in accordance with an embodiment of the present invention.
DETAILED DESCRIPTION OF THE INVENTION
[0024] FIG. 1 illustrates a perspective view of an exemplary
embodiment of a damper assembly 100 for use in a SDHV HVAC system,
in accordance with various aspects of the present invention. The
damper assembly 100 is designed to operate in the much higher
static pressure environments that a SDHV HVAC system typically
produces (e.g., 1 to 2 inches of water column). FIG. 2 illustrates
a side view of the damper assembly 100 of FIG. 1, in accordance
with various aspects of the present invention. FIGS. 3a-3d
illustrate several different views of the damper assembly 100 of
FIG. 1, in accordance with various aspects of the present
invention. FIGS. 4a-4c illustrate several component parts of the
damper assembly 100 of FIG. 1, in accordance with various aspects
of the present invention.
[0025] The damper assembly 100 comprises a first damper housing
half 110 comprising a substantially cylindrical tube having two
open ends. The damper assembly 100 further comprises a second
damper housing half 120 comprising a substantially cylindrical tube
having two open ends. The second damper housing half 120 is joined
to the first damper housing half 110 to form an assembled damper
housing 110 and 120. In accordance with an embodiment of the
present invention, the damper housing halves 110 and 120 are
substantially identical and made of a molded plastic material. The
damper assembly 100 also comprises a substantially elliptical
damper blade 130 pivotally mounted within the assembled damper
housing 110 and 120 along a minor axis 135 of the damper blade 130
for movement between an open position and a closed position. The
open position allows air to flow through the assembled damper
housing 110 and 120 and the closed position substantially blocks
the flow of air through the damper housing 110 and 120 when
installed in a SDHV HVAC system. As used herein, the term
"elliptical" means oval or non-circular. That is, the substantially
elliptical damper blade has a major axis and a minor axis where the
length of the major axis is longer than the length of the minor
axis. In other words, a length of the elliptical damper blade is
longer than a width of the elliptical damper blade.
[0026] The damper assembly 100 further comprises an actuator member
140 having a first end 141 and a second end 142 (see FIG. 2, FIG.
3a, and FIG. 4a). The actuator member 140 is pivotally connected to
a first side 131 of the damper blade 130 near the first end 141 of
the actuator member 140. The actuator member 140 extends through an
opening 115 in the assembled damper housing 110 and 120 toward the
second end 142 of the actuator member such that the damper blade
130 pivots about the minor axis 135 when the actuator member 140 is
moved along a longitudinal axis 145 of the actuator member 140. In
accordance with an embodiment of the present invention, the
actuator member comprises a rod having longitudinal axis 145 that
is substantially perpendicular to the minor axis 135 of the damper
blade 130, although the longitudinal axis 145 is in a different
plane than the minor axis 135.
[0027] The damper assembly 100 also comprises a damper actuator 150
which is mounted to the assembled damper housing 110 and 120 such
that the second end 142 of the actuator member 140 is connected to
a movable diaphragm (driving element) inside the damper actuator
150. The damper actuator 150 is of the type described in U.S. Pat.
No. 5,458,148 which is incorporated herein by reference in its
entirety and is an air flow fluid actuator. FIG. 2 of U.S. Pat. No.
5,458,148 illustrates an embodiment of such a damper actuator 150.
Referring to FIGS. 1-4 herein, when the actuator member 140 is
driven along the direction of the longitudinal axis 145 by forcing
air into the damper actuator 150 or by sucking air out of the
damper actuator 150, the damper blade 130 pivots about the minor
axis 135 between an opened position and a closed position. However,
other types of damper actuators may be used as well to drive the
actuator member 140 such as, for example, an electric motor
actuator.
[0028] When air is pulled out of the damper actuator 150, the
damper blade 130 is pulled downward and the damper opens allowing
air to pass through the damper housing 110 and 120. The damper
blade 130 shown in FIG. 2 is in the opened position. When air is
pushed into the damper actuator 150, the damper blade 130 is pushed
closed and conditioned air flow is blocked. The damper blade 130
shown in FIG. 1 is in the closed position. The oval shape of the
damper blade 130 allows the edges of the damper blade 130 to
tightly fit against the inner surface of the damper assembly
housing halves 110 and 120 when in the closed position. In
accordance with an embodiment of the present invention, the bottom
or far side of the damper actuator housing 151 of the damper
actuator 150 is used as a stop for the actuator member 140 such
that the damper blade 130 is fully open at centerline position when
the actuator member 140 is stopped as such (i.e., when the air is
sucked out of the damper actuator 150).
[0029] In accordance with an embodiment of the present invention,
the damper assembly housing halves 110 and 120 each include
integral threads 111 and 121 on an outside surface of the housing
halves 110 and 120. The integral threads 111 and 121 allow the
housing halves 110 and 120 to be twisted into SDHV flex line duct
on each side 116 and 117 of the damper assembly housing halves 110
and 120 during installation of the damper assembly 100. The threads
111 and 121 help to hold the ends of the housing halves 110 and 120
secure within the SDHV flex line duct. However, in accordance with
an alternative embodiment of the present invention, threads are not
used (i.e., there are no integral threads on the housing halves 110
and 120).
[0030] Each of the damper housing halves 110 and 120 include a
joining flange 112 and 122 respectively. The joining flanges 112
and 122 each include two axle receiver recesses 161 and 162 (see
FIG. 4b) to receive an axle 170 of the damper blade 130. The damper
blade 130 includes an axle 170 extending from two opposite edges of
the damper blade in line with the minor axis 135. The axle 170,
when mounted between the two housing halves 110 and 120 in the
recesses 161 and 162 allows the damper blade to pivot about the
minor axis 135. The axle 170 may simply comprise an integral nub or
extension protruding from each side of the damper blade 130 in line
with the minor axis 135 as shown in FIG. 4c. Alternatively, the
axle 170 may comprise a separate rod extending the entire width of
the damper blade 130 along the minor axis 135 and being attached to
the damper blade 130. Other axle configurations are possible as
well, in accordance with various embodiments of the present
invention.
[0031] The substantially oval shape of the damper blade 130 limits
the amount of side to side movement of the actuator member 140
which reduces flexing of the junction between the member 140 and
the diaphragm within the damper actuator 150 to which the second
end 142 of the actuator member 140 is connected. Such limited side
to side movement promotes long and reliable operation and spreads
out the force provided by the actuator member 140 on both the top
and bottom of the damper blade 130 as well as the axle 170,
allowing the required thickness of the damper blade 130 to be
reduced.
[0032] In accordance with an embodiment of the present invention,
the first side 131 of the damper blade 130 includes two brackets
181 and 182 extending from the first side 131 such that the
actuator member 140 may be pivotally connected to the damper blade
130 via the two brackets 181 and 182. A pin 183 (see FIG. 2) is
used to secure the actuator member 140 to the brackets 181 and 182
by inserting the pin 183 through holes in the brackets 181 and 182
and in the actuator member 140 near the first end 141 of the
actuator member 140. The damper blade 130 also includes beveled
edges 185 and 186 to provide a tight fit between the edges of the
damper blade 130 and an interior surface of the assembled damper
housing 110 and 120 when the damper blade 130 is in the closed
position, in accordance with an embodiment of the present
invention.
[0033] In accordance with an embodiment of the present invention,
most of the elements of the damper assembly 100 are made of a
molded plastic material such as, for example, a polycarbonate/ABS
blend for strength, temperature tolerance, and product longevity.
Also, flame retardant additives may be used to give the assembly
100 the product V0 rating (i.e., self-extinguishing within a
certain time frame).
[0034] FIG. 5 is a flow chart of an embodiment of a method 500 of
assembling the damper assembly 100 of FIG. 1, in accordance with
various aspects of the present invention. In step 510 the various
component parts of the damper assembly 100 are identified including
the damper actuator 150 having a damper actuator housing 151 and a
protruding actuator member 140, the damper blade 130 having an axle
170 and at least one bracket 181 and 182, a first damper housing
half 110 having a first joining flange 112 with first axle receiver
recesses 161 and 162, and a second damper housing half 120 having a
second joining flange 122 with second axle receiver recesses 161
and 162.
[0035] In step 520, the damper blade 130 is pivotally secured to
the actuator member 140 via the brackets 181 and 182 on a back
surface 131 of the damper blade 130. In accordance with an
embodiment of the present invention, the damper blade 130 is
pivotally secured to the actuator member 140 by inserting a pin 183
through a hole near the first end 141 of the actuator member and
through another hole in each of the brackets 181 and 182 such that
the actuator member 140 resides between the two brackets 181 and
182. In accordance with an alternative embodiment of the present
invention, only one bracket may be used to pivotally attach the
actuator member 140 to the back of the damper blade 130. Other
methods of pivotally attaching the actuator member 140 to the back
of the damper blade 130 are possible as well, in accordance with
other various embodiments of the present invention.
[0036] In step 530, the first damper housing half 110 is loosely
secured to the damper actuator housing 151. In step 540, the axle
170 of the damper blade 130 is aligned with the first axle receiver
recesses 161 and 162 in the first joining flange 112 of the first
damper housing half 110. In step 550, the second damper housing
half 120 is tightly secured to the first damper housing half 110 at
the joining flanges 112 and 122 such that the axle 170 is also
aligned with the second axle receiver recesses 161 and 162 in the
second joining flange 122 of the second damper housing half 120.
The first damper housing half 110 may be loosely secured to the
damper actuator housing 151 by screwing a screw through a hole in a
base 113 (see FIG. 4b) of the first damper housing half 110 and
into a corresponding hole in the damper actuator housing 151. The
second damper housing half 120 may be secured to the first damper
housing half 110 via bolts and nuts where the bolts pass through
holes in the joining flanges 112 and 122.
[0037] In step 560, the loosely secured damper housing halves 110
and 120 are aligned to the damper actuator housing 151. Aligning
the loosely secured damper housing halves 110 and 120 (i.e.,
loosely secured to the damper actuator housing 151 by one screw but
tightly secured to each other by nuts and bolts) to the damper
actuator housing 151 includes lining up a screw hole in a base 113
of the second damper housing half 120 with a screw hole in the
damper actuator housing 151 by pivoting the connected damper
housing halves 110 and 120 about the screw loosely securing the
first damper housing half 110. In accordance with an embodiment of
the present invention, the damper housing halves 110 and 120 are
substantially identical and the joining flanges 112 and 122 are
finished such that the resultant joint is air tight up to a static
pressure of at least 5 inches of water column (a safety factor of
300%).
[0038] In step 570, the aligned damper housing halves 110 and 120
are tightly secured to the damper actuator housing 151. The first
damper housing half 110 and the second damper housing half 120 are
tightly secured to the damper actuator housing 151 via screws. For
example, the screw that is loosely securing the first damper
housing half 110 is tightened down and another screw is used to
tightly secure the second damper housing half 120 to the damper
actuator housing 151 in a similar manner after alignment of the
damper housing halves 110 and 120 to the damper actuator housing
151.
[0039] FIG. 6 is a flow chart of an embodiment of a method 600 of
installing the damper assembly 100 of FIG. 1, in accordance with
various aspects of the present invention. FIG. 7 is an illustration
showing the damper assembly 100 of FIG. 1 installed between two
sections 710 and 720 of SDHV flex line duct work, in accordance
with an embodiment of the present invention.
[0040] In step 610 of the method 600, a cut is made through a
cross-section of small duct high velocity (SDHV) flex line duct
work to form two open sections 710 and 720 of duct work. The cut
may be made with a simple box cutter knife or some other cutting
tool, for example. In step 620, a first open end 116 of the damper
assembly housing 110 and 120 is inserted into the first open
section 710 of the duct work to form a first joint 711. In step
630, a second open end 117 of the damper assembly housing 110 and
120 is inserted into the second open section 720 of the duct work
to form a second joint 721. Insertion may be accomplished, for
example, by twisting the threaded open ends of the damper housing
halves 110 and 120 into the two open sections 710 and 720 of the
duct work.
[0041] In step 640, the first joint 711 is secured to hold the
first open end 116 within the first open section 710. In step 650,
the second joint 721 is secured to hold the second open end 117
within the second open section 720. The joints 711 and 721 may be
secured by, for example, tightening a heavy Nylon cable around each
joint. Clamps or other securing means may be used instead. In step
660, the first joint 711 is sealed to form a first air tight sealed
joint. In step 670, the second joint 721 is sealed to form a second
air tight sealed joint. In accordance with an embodiment of the
present invention, air tight duct tape, for example, is used to
seal the joints 711 and 721. Other means may be used to seal the
joints instead.
[0042] In step 680, a first end of an air supply line 730 is
connected to an inlet port 735 of the damper actuator 150. A second
end of the air supply line 730 may be routed to a pressure/vacuum
air pump of the HVAC system and connected to a port of the
pressure/vacuum pump. Once the basic installation is completed, as
described above, the installed damper assembly 100 may be wrapped
using, for example, standard duct wrap in order to protect and
insulate the installed damper assembly 100. Since, the damper
assembly 100 has no moving external parts and generates no heat, it
is safe to wrap the entire assembly 100.
[0043] In summary, a SDHV damper assembly and methods to assemble
and install the SDHV damper assembly are disclosed. The SDHV damper
assembly encloses a substantially elliptical damper blade within
two damper housing halves such that the damper blade may pivot
about a minor axis of the damper blade. An actuator member ties a
damper actuator to the damper blade such that the damper actuator
may drive the damper blade between open and closed positions in
order to control air flow into a zone.
[0044] While the invention has been described with reference to
certain embodiments, it will be understood by those skilled in the
art that various changes may be made and equivalents may be
substituted without departing from the scope of the invention. In
addition, many modifications may be made to adapt a particular
situation or material to the teachings of the invention without
departing from its scope. Therefore, it is intended that the
invention not be limited to the particular embodiment disclosed,
but that the invention will include all embodiments falling within
the scope of the appended claims.
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