WO2005088204A1 - Exhaust air damper - Google Patents

Exhaust air damper Download PDF

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Publication number
WO2005088204A1
WO2005088204A1 PCT/FI2005/000147 FI2005000147W WO2005088204A1 WO 2005088204 A1 WO2005088204 A1 WO 2005088204A1 FI 2005000147 W FI2005000147 W FI 2005000147W WO 2005088204 A1 WO2005088204 A1 WO 2005088204A1
Authority
WO
WIPO (PCT)
Prior art keywords
damper
exhaust air
body part
control
air flow
Prior art date
Application number
PCT/FI2005/000147
Other languages
Finnish (fi)
French (fr)
Inventor
Esa Lampinen
Original Assignee
Fläkt Woods AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fläkt Woods AB filed Critical Fläkt Woods AB
Publication of WO2005088204A1 publication Critical patent/WO2005088204A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/08—Air-flow control members, e.g. louvres, grilles, flaps or guide plates
    • F24F13/10—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers
    • F24F13/12—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers built up of sliding members

Definitions

  • the present invention relates to an exhaust air damper for use in a room space or like interior, the exhaust air damper being mounted to the end of an exhaust air duct on a wall or ceiling surface of the room space, whereby the exhaust air damper comprises a damper body part including an air flow channel and a control means attached to the damper body part so as to facilitate adjustment of air outlet flow rate from the room space.
  • exhaust air dampers that have been developed for the same task and comprise a damper body part with a damper disc adjustably mounted thereon.
  • the damper body may have, e.g., a conical air channel and a substantially conformant conical shape on the damper disc.
  • the damper disc is typically adapted mountable so that the disc shaft can be treaded into a compatibly threaded hole of the damper body part.
  • the rotation of the damper disc allows the flow cross section between the body part and the disc to be adjusted larger or smaller, whereby the volumetric rate of the exhaust air passing there through may be controlled.
  • An exhaust air damper according to the invention is characterized in that the air flow channel opens in the interior of the damper body part about the longitudinal center axis of the damper by more than 180° but less than 270°, advantageously about 220°, and that the damper control means comprises one or more control vanes attached to the center shaft of the damper body part so as to be rotatable in a plane perpendicular to the air flow direction, whereby the control function is accomplished by means of covering a given cross-sectional portion of the airflow channel by the control vanes.
  • a preferred embodiment of the exhaust air damper according to the invention is characterized in that the number of control vanes is two and that the first control vane has the shape of a circular sector with a flaring angle greater than 90° but less than 180°, advantageously about 100°, and that the second control vane has substantially the shape of circular sector with a flaring angle smaller than 90°, advantageously about 80°, and that the control vanes are adapted to be movable in an at least partially overlapping fashion.
  • Another preferred embodiment of the exhaust air damper according to the invention is characterized in that the mounting of the control vanes onto the center shaft of the damper body part is accomplished with the help of a screw adapted insertable into an internally threaded hole of the damper center shaft, whereby the tightening of the screw may also be used for locking the control vanes in place after having them set in a desired position.
  • a still another preferred embodiment of the exhaust air damper according to the invention is characterized in that the inlet-end edge of the air flow channel in the damper body part is rounded and the channel is shaped to taper substantially smoothly in the airflow direction, whereby the airflow is directed substantially into the center portion of the airflow channel.
  • the exhaust air damper according to the invention features an extremely low noise emission. Moreover, the damper is easy to adjust due to the uncomplicated arrangement of locking/unlocking the control means even after the damper has been mounted in place.
  • FIG. 1 shows an exploded view of an exhaust air damper according to the invention
  • FIG. 2 shows an axonometric view of an exhaust air damper according to the invention set into its maximum flow position
  • FIG. 3 shows the same damper construction as FIG. 2, now set into its minimum flow position.
  • FIG. 1 an exhaust air damper according to the invention in an exploded view.
  • This type of damper is mounted to the end of an air ventilation duct, on the wall or ceiling of the ventilated room or like space.
  • the damper comprises a body part 1 having an annular cross section with a first control vane 2 and a second control vane 3 attached thereto.
  • the body part 1 incorporates an air flow channel or opening 4 whose segmental opening angle about the longitudinal center axis of the damper is greater than 180° but less than 270°, in the illustrated embodiment about 220°.
  • the body part 1 includes a center shaft 5 having a hole made therein with an inner thread to accommodate a screw 6. The screw serves to affix and lock the control vanes 2 and 3 in place.
  • the center shaft 5 may have made therein a slot suited to hold an inner-threaded nut. Then, an outer- threaded screw can be inserted in the inner thread of the nut.
  • the inlet-end edge of the flow channel in the body part 1 of the exhaust air damper is shaped slightly rounded having a radius of curvature of, e.g., about 12-15 mm. Additionally, the channel inlet-end opening is shaped to taper smoothly in the airflow direction with a tapering angle of, e.g., about 18°, thus directing the air flow into the center portion of the air flow channel, whereby the flow is prevented from impacting on the channel walls. This arrangement serves to minimize the noise emitted by the damper.
  • the control vanes 2 and 3 have substantially the shape of a circular sector, whereby the flaring angle of the greater control vane 2 is, e.g., about 100°.
  • the flaring angle may be varied between 90° and 180°.
  • the second vane so-called auxiliary control vane, also has the shape of a circular sector advantageously having a flaring angle of about 80°. Depending on the damper design, this flaring angle is 50° to 90°.
  • holes 7 and 8 are provided substantially at the centers of curvature of the control vanes.
  • the front edge (facing the flow channel) of control vane 2 is shaped essentially conformant to the shape of the flow channel opening, thus maintaining the low noise emission level of the damper.
  • a graduated scale for damper adjustment.
  • the setting on the scale is read with the help of an arrow 9 stamped on the control vane 2.
  • the adjustment is performed by way of untightening the screw 6 so much that the control vanes can be moved in a plane substantially perpendicular to the air flow direction inasmuch as the vanes are rotatable about the damper center shaft 5 (that is, the screw 6).
  • the rotation of the control vanes makes it possible to adjust the open cross section of the flow channel 4. The greater the open area of the damper, the more air is exhausted via the damper from the room space.
  • control vanes 2, 3 needs to be two inasmuch as one control vane cannot provide a sufficiently wide span of adjustment.
  • the cover plate On the front surface of the exhaust air damper according to the invention is formed or attached three fixing pegs 10 for mounting the decorative/cover plate of the damper.
  • the cover plate is set at the distance of a few centimeters from the front surface of the exhaust air damper, whereby it will not degrade the function of the damper.
  • the actual design of the decorative cover plate may be varied freely as to the desired look (shape, color, material, etc.) of the damper.
  • the decorative cover plate has been omitted from the drawings.
  • the shape of the damper inlet opening may be different from that shown in the drawing.
  • the size of the inlet opening may be varied as required by the intended application.
  • the number and size of control vanes is dictated by the selected size and flow control span of the damper opening.
  • One or more control vanes may be used. However, the most typical number of vanes is two as discussed above.
  • the exhaust air damper according to the invention may be advantageously made from a polymer material.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Air-Flow Control Members (AREA)

Abstract

An exhaust air damper is disclosed for use in a room space or like interior, the exhaust air damper having a circular cross section and being mounted to the end of an exhaust air duct on a wall or ceiling surface of the room space, whereby the exhaust air damper comprises a damper body part (1) including an air flow channel (4) and a control means (2, 3) attached to the damper body part so as to facilitate adjustment of air outlet flow rate from the room space. The invention is implemented such that the air flow channel (4) opens in the interior of the damper body part (1) about the longitudinal center axis (5) of the damper by more than 1800 but less than 270°, advantageously about 220°, and that the damper control means comprises one or more control vanes (2, 3) attached to the center shaft (5) of the damper body part (1) so as to be rotatable in a plane perpendicular to the air flow direction, whereby the control function is accomplished by means of covering a given cross-sectional portion of the air flow channel by the said control vanes (2, 3).

Description

Exhaust air damper
The present invention relates to an exhaust air damper for use in a room space or like interior, the exhaust air damper being mounted to the end of an exhaust air duct on a wall or ceiling surface of the room space, whereby the exhaust air damper comprises a damper body part including an air flow channel and a control means attached to the damper body part so as to facilitate adjustment of air outlet flow rate from the room space.
In the art are known exhaust air dampers that have been developed for the same task and comprise a damper body part with a damper disc adjustably mounted thereon. The damper body may have, e.g., a conical air channel and a substantially conformant conical shape on the damper disc. The damper disc is typically adapted mountable so that the disc shaft can be treaded into a compatibly threaded hole of the damper body part. Thus, the rotation of the damper disc allows the flow cross section between the body part and the disc to be adjusted larger or smaller, whereby the volumetric rate of the exhaust air passing there through may be controlled.
While plural other types of the exhaust air dampers are known in the art, all of them are characterized by having the control means adapted movable in the direction of the longitudinal axis of the exhaust air duct.
It is an object of the present invention to provide a novel type of exhaust air damper featuring an air flow control technique different from that of conventional dampers. An exhaust air damper according to the invention is characterized in that the air flow channel opens in the interior of the damper body part about the longitudinal center axis of the damper by more than 180° but less than 270°, advantageously about 220°, and that the damper control means comprises one or more control vanes attached to the center shaft of the damper body part so as to be rotatable in a plane perpendicular to the air flow direction, whereby the control function is accomplished by means of covering a given cross-sectional portion of the airflow channel by the control vanes.
A preferred embodiment of the exhaust air damper according to the invention is characterized in that the number of control vanes is two and that the first control vane has the shape of a circular sector with a flaring angle greater than 90° but less than 180°, advantageously about 100°, and that the second control vane has substantially the shape of circular sector with a flaring angle smaller than 90°, advantageously about 80°, and that the control vanes are adapted to be movable in an at least partially overlapping fashion.
Another preferred embodiment of the exhaust air damper according to the invention is characterized in that the mounting of the control vanes onto the center shaft of the damper body part is accomplished with the help of a screw adapted insertable into an internally threaded hole of the damper center shaft, whereby the tightening of the screw may also be used for locking the control vanes in place after having them set in a desired position.
A still another preferred embodiment of the exhaust air damper according to the invention is characterized in that the inlet-end edge of the air flow channel in the damper body part is rounded and the channel is shaped to taper substantially smoothly in the airflow direction, whereby the airflow is directed substantially into the center portion of the airflow channel.
As compared with conventional damper constructions, the exhaust air damper according to the invention features an extremely low noise emission. Moreover, the damper is easy to adjust due to the uncomplicated arrangement of locking/unlocking the control means even after the damper has been mounted in place.
In the following, the invention is described in more detail with reference to the appended drawings in which FIG. 1 shows an exploded view of an exhaust air damper according to the invention;
FIG. 2 shows an axonometric view of an exhaust air damper according to the invention set into its maximum flow position; and
FIG. 3 shows the same damper construction as FIG. 2, now set into its minimum flow position.
In FIG. 1 is shown an exhaust air damper according to the invention in an exploded view. This type of damper is mounted to the end of an air ventilation duct, on the wall or ceiling of the ventilated room or like space. The damper comprises a body part 1 having an annular cross section with a first control vane 2 and a second control vane 3 attached thereto. The body part 1 incorporates an air flow channel or opening 4 whose segmental opening angle about the longitudinal center axis of the damper is greater than 180° but less than 270°, in the illustrated embodiment about 220°. The body part 1 includes a center shaft 5 having a hole made therein with an inner thread to accommodate a screw 6. The screw serves to affix and lock the control vanes 2 and 3 in place. Obviously, other like threaded mounting techniques and designs may be used as well. For instance, the center shaft 5 may have made therein a slot suited to hold an inner-threaded nut. Then, an outer- threaded screw can be inserted in the inner thread of the nut.
The inlet-end edge of the flow channel in the body part 1 of the exhaust air damper is shaped slightly rounded having a radius of curvature of, e.g., about 12-15 mm. Additionally, the channel inlet-end opening is shaped to taper smoothly in the airflow direction with a tapering angle of, e.g., about 18°, thus directing the air flow into the center portion of the air flow channel, whereby the flow is prevented from impacting on the channel walls. This arrangement serves to minimize the noise emitted by the damper. The control vanes 2 and 3 have substantially the shape of a circular sector, whereby the flaring angle of the greater control vane 2 is, e.g., about 100°. Depending on the damper design, the flaring angle may be varied between 90° and 180°. The second vane, so-called auxiliary control vane, also has the shape of a circular sector advantageously having a flaring angle of about 80°. Depending on the damper design, this flaring angle is 50° to 90°. To accommodate a mounting screw 6, holes 7 and 8 are provided substantially at the centers of curvature of the control vanes. The front edge (facing the flow channel) of control vane 2 is shaped essentially conformant to the shape of the flow channel opening, thus maintaining the low noise emission level of the damper.
On the front surface of the damper body part 1 , close to its perimeter, is made a graduated scale for damper adjustment. The setting on the scale is read with the help of an arrow 9 stamped on the control vane 2. The adjustment is performed by way of untightening the screw 6 so much that the control vanes can be moved in a plane substantially perpendicular to the air flow direction inasmuch as the vanes are rotatable about the damper center shaft 5 (that is, the screw 6). Thus, the rotation of the control vanes makes it possible to adjust the open cross section of the flow channel 4. The greater the open area of the damper, the more air is exhausted via the damper from the room space. In FIG. 2 is illustrated the maximally open flow control position of the exhaustair damper, where it is so much opened as possible. In FIG. 3, respectively, the damper is set into its utmost minimum flow position, where it is so tightly closed as possible. After the control vanes are adjusted into their desired position, screw 6 is tightened, whereby the control vanes are locked in place.
In the illustrated embodiment and application, the number of control vanes 2, 3 needs to be two inasmuch as one control vane cannot provide a sufficiently wide span of adjustment. According to the invention, the control vanes in their maximum flow position and in a close vicinity thereof overlap each other at least partially (FIG. 2), whereby a sufficiently wide area of the flow opening can be assured.
On the front surface of the exhaust air damper according to the invention is formed or attached three fixing pegs 10 for mounting the decorative/cover plate of the damper. In practice, the cover plate is set at the distance of a few centimeters from the front surface of the exhaust air damper, whereby it will not degrade the function of the damper. The actual design of the decorative cover plate may be varied freely as to the desired look (shape, color, material, etc.) of the damper. The decorative cover plate has been omitted from the drawings.
To a person skilled in the art it is obvious that the invention is not limited by the above-described exemplary embodiment, but rather may be varied within the inventive spirit and scope of the appended claims. The shape of the damper inlet opening may be different from that shown in the drawing. Furthermore, the size of the inlet opening may be varied as required by the intended application. Hence, the number and size of control vanes is dictated by the selected size and flow control span of the damper opening. One or more control vanes may be used. However, the most typical number of vanes is two as discussed above. The exhaust air damper according to the invention may be advantageously made from a polymer material.

Claims

What is claimed is:
1. An exhaust air damper for use in a room space or like interior, the exhaust air damper having a circular cross section and being mounted to the end of an exhaust air duct on a wall or ceiling surface of the room space, whereby the exhaust air damper comprises a damper body part (1) including an air flow channel (4) and a control means (2, 3) attached to the damper body part so as to facilitate adjustment of air outlet flow rate from the room space, c h a r a c t e r i z e d in that the air flow channel (4) opens in the interior of the damper body part (1 ) about the longitudinal center axis (5) of the damper by more than 180° but less than 270°, advantageously about 220°, and that the damper control means comprises one or more control vanes (2, 3) attached to the center shaft (5) of the damper body part (1 ) so as to be rotatable in a plane perpendicular to the air flow direction, whereby the control function is accomplished by means of covering a given cross- sectional portion of the air flow channel by said control vanes (2, 3).
2. The exhaust air damper of claim 1 , c h a r a c t e r i z e d in that the number of said control vanes (2, 3) is two and that the first control vane (2) has substantially the shape of a circular sector with a flaring angle greater than 90° but less than 180°, advantageously about 100°, and that the second control vane (3) has the shape of circular sector with a flaring angle smaller than 90°, advantageously about 80°, and that the control vanes (2, 3) are adapted to be movable in an at least partially overlapping fashion.
3. The exhaust air damper of claim 1 or 2, c h a r a c t e r i z e d in that the mounting of the control vanes (2, 3) onto the center shaft (5) of the damper body part (1 ) is accomplished with the help of a screw (6) adapted insertable into an internally threaded hole of the damper center shaft, whereby the tightening of the screw also locks the control vanes (2, 3) in place after having them set in a desired position.
4. The exhaust air damper of any one of claims 1-3, characterized in that the inlet-end edge of the airflow channel (4) in the damper body part (1) is rounded and the channel is shaped to taper substantially smoothly in the air flow direction, whereby the air flow is directed substantially into the center portion of the air flow channel.
PCT/FI2005/000147 2004-03-18 2005-03-11 Exhaust air damper WO2005088204A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20040416 2004-03-18
FI20040416A FI20040416A (en) 2004-03-18 2004-03-18 Exhaust valve

Publications (1)

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WO2005088204A1 true WO2005088204A1 (en) 2005-09-22

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PCT/FI2005/000147 WO2005088204A1 (en) 2004-03-18 2005-03-11 Exhaust air damper

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WO (1) WO2005088204A1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007094992A1 (en) * 2006-02-14 2007-08-23 Hewlett-Packard Development Company L.P. Ventilation tile with collapsible damper
EP2481999A1 (en) * 2011-01-26 2012-08-01 The Heating Company BVBA Adjustable air valve
US8639651B2 (en) 2009-10-30 2014-01-28 Hewlett-Packard Development Company, L. P. Manipulating environmental conditions in an infrastructure
WO2014039834A1 (en) * 2012-09-06 2014-03-13 Houweling Nurseries Oxnard, Inc. Adjustable endcap for use with a greenhouse distribution conduit
US8744631B2 (en) 2011-01-28 2014-06-03 Hewlett-Packard Development Company, L.P. Manipulating environmental conditions in an infrastructure

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117044462B (en) * 2023-10-10 2024-01-26 昆山寰安电子科技有限公司 Sowing device and agricultural unmanned aerial vehicle

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1611735A (en) * 1926-03-26 1926-12-21 Garland Ventilator Company Register
DE1716977U (en) * 1955-12-13 1956-02-16 Carl Wilhelm Pflueger VENTILATION INSERT.
US4060096A (en) * 1975-07-02 1977-11-29 Max Gunter Schade Ventilator valve
DE3808424A1 (en) * 1988-03-14 1989-09-28 Maico Elektroapparate Fire-protection device for a fan
DE10135866C1 (en) * 2001-07-24 2002-11-28 Zlt Lueftungs Und Brandschutzt Rotary disk valve for regulating the volume of air flowing through a space comprises two counter-rotating disks and a fixed disk with congruent segmented openings having a specified segment angle

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1611735A (en) * 1926-03-26 1926-12-21 Garland Ventilator Company Register
DE1716977U (en) * 1955-12-13 1956-02-16 Carl Wilhelm Pflueger VENTILATION INSERT.
US4060096A (en) * 1975-07-02 1977-11-29 Max Gunter Schade Ventilator valve
DE3808424A1 (en) * 1988-03-14 1989-09-28 Maico Elektroapparate Fire-protection device for a fan
DE10135866C1 (en) * 2001-07-24 2002-11-28 Zlt Lueftungs Und Brandschutzt Rotary disk valve for regulating the volume of air flowing through a space comprises two counter-rotating disks and a fixed disk with congruent segmented openings having a specified segment angle

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007094992A1 (en) * 2006-02-14 2007-08-23 Hewlett-Packard Development Company L.P. Ventilation tile with collapsible damper
GB2449205A (en) * 2006-02-14 2008-11-12 Hewlett Packard Development Co Ventilation tile with collapsible damper
US8845404B2 (en) 2006-02-14 2014-09-30 Hewlett-Packard Development Company, L.P. Ventilation tile with collapsible damper
US8639651B2 (en) 2009-10-30 2014-01-28 Hewlett-Packard Development Company, L. P. Manipulating environmental conditions in an infrastructure
EP2481999A1 (en) * 2011-01-26 2012-08-01 The Heating Company BVBA Adjustable air valve
US8744631B2 (en) 2011-01-28 2014-06-03 Hewlett-Packard Development Company, L.P. Manipulating environmental conditions in an infrastructure
WO2014039834A1 (en) * 2012-09-06 2014-03-13 Houweling Nurseries Oxnard, Inc. Adjustable endcap for use with a greenhouse distribution conduit
US10405500B2 (en) 2012-09-06 2019-09-10 Glass Investment Projects, Inc. Adjustable endcap for use with a greenhouse distribution conduit

Also Published As

Publication number Publication date
FI20040416A0 (en) 2004-03-18
FI20040416A (en) 2005-09-19

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