GB2160307A - Dampers for use in ducting - Google Patents

Dampers for use in ducting Download PDF

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Publication number
GB2160307A
GB2160307A GB08414874A GB8414874A GB2160307A GB 2160307 A GB2160307 A GB 2160307A GB 08414874 A GB08414874 A GB 08414874A GB 8414874 A GB8414874 A GB 8414874A GB 2160307 A GB2160307 A GB 2160307A
Authority
GB
United Kingdom
Prior art keywords
damper
blades
frame
racks
pinions
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
GB08414874A
Other versions
GB8414874D0 (en
Inventor
David Ernest Robert Pritchard
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
PROGRESS PLASTICS
Original Assignee
PROGRESS PLASTICS
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 PROGRESS PLASTICS filed Critical PROGRESS PLASTICS
Priority to GB08414874A priority Critical patent/GB2160307A/en
Publication of GB8414874D0 publication Critical patent/GB8414874D0/en
Publication of GB2160307A publication Critical patent/GB2160307A/en
Withdrawn legal-status Critical Current

Links

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
    • F24F13/14—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers built up of tilting members, e.g. louvre
    • F24F13/1426—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers built up of tilting members, e.g. louvre characterised by actuating means
    • 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
    • F24F13/14—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers built up of tilting members, e.g. louvre
    • F24F13/1413—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers built up of tilting members, e.g. louvre using more than one tilting member, e.g. with several pivoting blades
    • 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
    • F24F13/14—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers built up of tilting members, e.g. louvre
    • F24F13/1486—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers built up of tilting members, e.g. louvre characterised by bearings, pivots or hinges
    • 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
    • F24F13/14—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers built up of tilting members, e.g. louvre
    • F24F13/1426—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers built up of tilting members, e.g. louvre characterised by actuating means
    • F24F2013/1473—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers built up of tilting members, e.g. louvre characterised by actuating means with cams or levers

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

Blade type dampers, particularly of the opposed blade type, normally have adjustment devices comprising links and levers, which mechanisms are not easy to manufacture satisfactorily in plastics materials. In accordance with the present invention, each blade is drivably associated with an individual pinion 5, and the pinions 5 are co-operable with racks 12 arranged on a common frame 10. The frame 10 is arranged for sliding movement and has a slot 16 co- operable with a static pin 14 to delimit the movement. The racks 12 are arranged on interior faces of the frame 10. The frame 10, racks 12 and pinions 5 are preferably formed of plastics material. <IMAGE>

Description

SPECIFICATION Damper This invention relates to dampers for use in ducting, particularly but not solely opposed blade dampers for use in air ducts.
The adjustment of the blades of an opposed blade damper is achieved by conjoint rotation of the blades, normally within a 90 arc, between fully closed and fully open positions.
Adjacent blades are rotated in opposite directions in order to avoid parallelism of the blades, except in the fully open position of the blades. Such parallelism of the blades would mean that they would operate in the manner of an adjustable louvre, and would therefore have little effect on the air flow, apart from diverting it, until approaching the closed position. The adjustment of the blades is normally achieved by rotating blade-supporting spindles, with alternate spindles being rotated in opposite directions. The mechanism for achieving this mutual contra-rotation has hitherto normally consisted of an arrangement of links and levers, which is quite complex. In particular, it is difficult to make such a mechanism out of parts manufactured from plastics material, while maintaining smooth operation without sloppiness in the relatively rotating parts.When made of metal, such mechanisms require considerable maintenance to ensure proper operation.
In accordance with the invention, there is provided a damper for use in a duct, comprising a plurality of blades mounted for rotation between a closed position, wherein the blades co-operate substantially to close the duct, and an open position, wherein the blades allow substantially free flow in the duct, in which each blade is drivably associated with an individual pinion, and the pinions for the blades are co-operable with racks arranged on a common drive member.
The invention relates primarily to opposed blade dampers in which alternate blades are rotatable in opposite directions.
The common drive member may be an open frame arranged for sliding movement, with the racks arranged on interior faces of the frame. The frame may have a slot cooperable with a static pin to delimit the movement.
The common drive member, racks and pinions are conveniently formed of plastics material.
The invention will be further described with reference to the accompanying drawings, in which: Figure 1 is an elevational view, partly in section, illustrating a typical damper arrangement to which the invention may be applied; Figure 2 is a section through a typical damper blade; Figure 3 is a side elevation of one form of damper operating mechanism in accordance with the teaching of the invention; and Figure 4 is a section taken along the line Z-Z of Fig. 3.
The drawings show a damper comprising a short length of ducting 1 adapted to be aligned with the duct to be controlled and secured thereto by flanges 2. The ducting 1 illustrated has a pair of parallel sides 1 a and 1 b between which extends a group of spindles 3 carrying damper blades 4, a typical form of which is shown in section in Fig. 2.
One end of each of the spindles 3 carries a pinion 5 for driving the blade in rotation for adjustment of its position. In Fig. 1 the blades 4 are shown in fully closed position, in which the blades 4 effectively form a barrier across the duct. In the fully open position (not illustrated), the blades are rotated through 90 so as to be parallel with each other along the duct to present minimum resitance to flow. In an opposed blade damper as illustrated, alternate ones of the blades will be rotated in opposite directions.
On the side wall 1 a, there is arranged and secured a pair of parallel side bars 6 which have rebates 7 on their opposed faces. These rebates 7 form, with removable cappings 8 secured to the bars 6 by bolts 9, a pair of slideways for an operating member in the form of an open rectangular frame 10. The outer edges of the long sides of the frame 10 run in the slideways and the short sides bridge the space between the side bars 6. The pinions 6 are secured to the spindles 3 by nuts 11, so as to be located in the area bounded by the frame 10, as particularly illustrated in Fig. 4.
The inner edges of the long sides of the frame 10 are provided with lengths of rack 12, for example welded into position, to cooperate with the pin ions 5 to rotate the latter as the frame 10 is slid along the slideways. It will be seen that the racks for alternate pinions are on opposite sides of the frame to provide the contra-rotation required for an opposed blade damper.
A ledge 1 3 is located on one of the side bars 6 and carries a pin 1 4 extending through a slot 1 6 in the frame 10 and acting to limit the movement of the frame 10 within the slideways. A knurled locking nut 1 5 is provided to lock the frame 10 in any desired adjusted position.
The arrangement is adjusted so that the blades are in one extreme position when the pin 14 is at one of the slot 16 and in the other extreme position when the pin 14 is at the other end of the slot 16.
By removing the cappings 8 and the locking nut 15, the frame 10 may be removed from or installed in the slideways.
It will be seen that the frame 10 and the racks 12, together with the pinions 6, may be made of suitable plastics materials, while the mechanism may still be manufactured to sufficiently tight tolerances to avoid undue sloppiness.
Adjustment of the position of the damper is simply achieved by releasing the lock nut and manually or otherwise moving the frame 10 in the slideways until the adjustment has been achieved, when the nut 1 5 may be retightened. Non-manual adjustment may for instance be achieved mechanically, electrically, hydraulically or pneumatically. With non-manual adjustment, the nut 1 5 may possibly be omitted.
Various modifications may be made within the scope of the invention.

Claims (7)

1. A damper for use in a duct, comprising a plurality of blades mounted for rotation between a closed position, wherein the blades co-operate substantially to close the duct, and an open position, wherein the blades allow substantially free flow in the duct, in which each blade is drivably associated with an individual pinion, and the pinions for the blades are co-operable with racks arranged on a common drive- member.
2. A damper as claimed in claim 1, in which alternate blades are rotatable in opposite directions.
3. A damper as claimed in claim 1 or 2, in which the common drive member is an open frame arranged for sliding movement.
4. A damper as claimed in claim 3, in which the racks are arranged on interior faces of the frame.
5. A damper as claimed in claim 3 or 4, in which the open frame has a slot co-operable with a static pin to delimit the movement.
6. A damper as claimed in claim 1, 2, 3 or 4, in which the common drive member, racks and pinions are formed of plastics material.
7. A damper substantially as hereinbefore described with reference to the accompanying drawings.
GB08414874A 1984-06-11 1984-06-11 Dampers for use in ducting Withdrawn GB2160307A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08414874A GB2160307A (en) 1984-06-11 1984-06-11 Dampers for use in ducting

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB08414874A GB2160307A (en) 1984-06-11 1984-06-11 Dampers for use in ducting

Publications (2)

Publication Number Publication Date
GB8414874D0 GB8414874D0 (en) 1984-07-18
GB2160307A true GB2160307A (en) 1985-12-18

Family

ID=10562257

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08414874A Withdrawn GB2160307A (en) 1984-06-11 1984-06-11 Dampers for use in ducting

Country Status (1)

Country Link
GB (1) GB2160307A (en)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1053089A (en) * 1900-01-01
GB599567A (en) * 1945-09-18 1948-03-16 Ann Morris Improvements in ventilator constructions for buildings
GB708218A (en) * 1951-07-11 1954-04-28 Arthur Francis Agnew Movable flap louver windows
GB1483843A (en) * 1975-06-09 1977-08-24 Kris Overseas Ltd Edge fitting for a louvred window
GB2008742A (en) * 1977-08-17 1979-06-06 Blaw Ducts Ltd Pivoted Blade Ventilating Damper
GB1591885A (en) * 1976-12-22 1981-07-01 Actionair Equip Control damper

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1053089A (en) * 1900-01-01
GB599567A (en) * 1945-09-18 1948-03-16 Ann Morris Improvements in ventilator constructions for buildings
GB708218A (en) * 1951-07-11 1954-04-28 Arthur Francis Agnew Movable flap louver windows
GB1483843A (en) * 1975-06-09 1977-08-24 Kris Overseas Ltd Edge fitting for a louvred window
GB1591885A (en) * 1976-12-22 1981-07-01 Actionair Equip Control damper
GB2008742A (en) * 1977-08-17 1979-06-06 Blaw Ducts Ltd Pivoted Blade Ventilating Damper

Also Published As

Publication number Publication date
GB8414874D0 (en) 1984-07-18

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)