EP3144599A1 - Duct section for an air movement duct - Google Patents

Duct section for an air movement duct Download PDF

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Publication number
EP3144599A1
EP3144599A1 EP16187554.7A EP16187554A EP3144599A1 EP 3144599 A1 EP3144599 A1 EP 3144599A1 EP 16187554 A EP16187554 A EP 16187554A EP 3144599 A1 EP3144599 A1 EP 3144599A1
Authority
EP
European Patent Office
Prior art keywords
duct
section
air
inlet
nozzle
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.)
Granted
Application number
EP16187554.7A
Other languages
German (de)
French (fr)
Other versions
EP3144599B1 (en
Inventor
Iain Kinghorn
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.)
Flakt Woods Ltd
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Flakt Woods Ltd
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Filing date
Publication date
Application filed by Flakt Woods Ltd filed Critical Flakt Woods Ltd
Publication of EP3144599A1 publication Critical patent/EP3144599A1/en
Application granted granted Critical
Publication of EP3144599B1 publication Critical patent/EP3144599B1/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
    • F24F13/26—Arrangements for air-circulation by means of induction, e.g. by fluid coupling or thermal effect
    • 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
    • F24F13/02—Ducting arrangements
    • 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
    • F24F13/02—Ducting arrangements
    • F24F13/06—Outlets for directing or distributing air into rooms or spaces, e.g. ceiling air diffuser
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F7/00—Ventilation
    • F24F7/04—Ventilation with ducting systems, e.g. by double walls; with natural circulation
    • F24F7/06—Ventilation with ducting systems, e.g. by double walls; with natural circulation with forced air circulation, e.g. by fan positioning of a ventilator in or against a conduit

Definitions

  • the present invention relates to a duct section for an air movement duct for apparatus for ventilating, heating, air-conditioning and/or cooling a space.
  • the invention seeks to provide improvements in the efficiency of the air movement, particularly, but not exclusively when it is required to deflect the path of the air movement.
  • a duct section for an air movement duct comprising a duct inlet section for a fan driven primary air flow, the duct section further having a peripheral air inlet through which a secondary air flow is drawn into the duct section by entrainment by the passing primary air flow to form a combined air flow of both the primary and the secondary air flows, a nozzle comprising a guide vane arrangement being located downstream of the peripheral air inlet so as to be impinged by and to direct the combined air flows, wherein the guide vane arrangement of the nozzle comprises a plurality of guide vanes in spaced parallel relationship and extending transversely across the duct section.
  • the nozzle comprises a further part of the duct section spaced from the duct inlet section to form the peripheral air inlet therebetween.
  • the peripheral air inlet comprises a slot or plurality of slots extending around substantially the entire periphery of the duct section in a plane normal to the direction of the primary air flow.
  • the guide vanes are arranged to be pivotable about their longitudinal dimension transverse to the direction of the air movement whilst remaining in the parallel relationship.
  • the nozzle is pivotable about an axis substantially aligned with the periphery of the duct section to incline the vanes at an angle to the flow direction of the combined air flows.
  • the nozzle is pivotable by up to 20° from the axis of the duct section, and preferably up to 10°.
  • the periphery of the inlet side of the nozzle is profiled, in cross-section, to provide a curved inlet edge to provide a smooth transition of the internal surface of the duct section for the air flow from the primary duct section through the guide vanes irrespective of the angular displacement of the nozzle.
  • FIG. 1 there is shown a schematic cross-sectional view of a duct section 1 which consists of an duct inlet section 2 for a fan driven primary air flow moving in the direction indicated by the arrow 3 and, downstream of the duct inlet section 2 a nozzle 4 which is spaced from the inlet duct section 2 to provide a peripheral air inlet 5 through which, in operation, the primary air flowing past the peripheral air inlet 5 entrains air from outside the duct section 1 to provide a secondary flow 8 into the nozzle so that a combination of the primary air flow and the secondary air flow passes through the nozzle 4.
  • the peripheral air inlet 5 comprises a slot or plurality of slots extending around substantially the entire periphery of the duct inlet section 2 in a plane normal to the direction of the primary air flow.
  • the greater flow of air formed by the combination of the two flows generates a venturi effect through the nozzle 4 which speeds up the flow of air through the nozzle.
  • the nozzle 4 has three guide vanes 6 arranged in spaced parallel relationship and extending transversely across the duct section 1 to guide the air flow.
  • the vanes 6 have an aerodynamic profile to minimise turbulence as the air passes through the nozzle 4.
  • the nozzle 4 is arranged to pivot about a point 7 adjacent the periphery of the duct inlet section 2 to deflect the flow of air at an angle to the inlet flow of primary air as indicated by the arrows 3 in the duct inlet section.
  • This arrangement has the effect that secondary air entering adjacent the pivot point 7 travels at a different speed than the secondary air drawn in at other points on the periphery, particularly at a point 180° spaced from this pivot point 7, where the peripheral gap is wider. This speed difference can be used to bring about change in the flow direction. This has advantages in directing the flow leaving the nozzle 4.
  • the periphery of the nozzle 4 has a profile in cross section which has the same or slightly smaller internal diameter than that of the duct inlet section 2 and on the upstream edge 9 of the nozzle the profile is curved outwardly radially as shown to provide a smooth transition for both the primary and the secondary air flows into the nozzle 4.
  • FIG. 3 there is shown a part sectional view of the duct section in which the vanes in the nozzle have been removed from the nozzle in the interests of clarity.
  • the arrows 8 indicate the secondary air flow passing into the interior of the duct section 1 to combine with the primary air flow as both the air flows pass through the nozzle 4.
  • Figure 4 illustrates schematically, by means of bubbles, the general disposition of the air flows.
  • the primary air flow 3 enters the duct section 1 in the direction of the arrow 3and the secondary air flow 8 passes through the secondary air gap 5 to combine with the primary air flow so a much greater volume of air passes through the nozzle 4 as indicated by the density of the bubbles. Thus, a venturi effect through the nozzle is generated.
  • the nozzle 4 may arrange for the guide vanes to be pivoted in a different manner.
  • the nozzle could be pivoted about a transverse axis located on the axial axis of the duct section 1 so that the peripheral air inlet 5 has a reduced gap at one edge and an increased gap at the edges located 180° apart when it is tilted.
  • the vanes may be connected via a linkage arrangement movable to tilt the vanes simultaneously whilst retaining them in spaced parallel relationship.
  • three vanes are shown it will be understood that the number of vanes provided would depend upon the requirements of the particular installation and could therefore be one or more.
  • the duct could have a square, rectangular or other cross section.

Landscapes

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

Abstract

A duct section 1 for an air movement duct, has a duct inlet section 2 for a fan driven primary air flow 3, the duct section 1 further having a peripheral air inlet 5 through which a secondary air flow is drawn into the duct section 1 by entrainment by the passing primary air flow to form a combined air flow of both the primary and the secondary air flows. A nozzle 4 comprising a guide vane arrangement 6 is located downstream of the peripheral air inlet 5 so as to be impinged by and to direct the combined air flows.

Description

  • The present invention relates to a duct section for an air movement duct for apparatus for ventilating, heating, air-conditioning and/or cooling a space.
  • The invention seeks to provide improvements in the efficiency of the air movement, particularly, but not exclusively when it is required to deflect the path of the air movement.
  • According to the present invention there is provided a duct section for an air movement duct, comprising a duct inlet section for a fan driven primary air flow, the duct section further having a peripheral air inlet through which a secondary air flow is drawn into the duct section by entrainment by the passing primary air flow to form a combined air flow of both the primary and the secondary air flows, a nozzle comprising a guide vane arrangement being located downstream of the peripheral air inlet so as to be impinged by and to direct the combined air flows, wherein the guide vane arrangement of the nozzle comprises a plurality of guide vanes in spaced parallel relationship and extending transversely across the duct section.
  • Preferably, the nozzle comprises a further part of the duct section spaced from the duct inlet section to form the peripheral air inlet therebetween.
  • Alternatively, the peripheral air inlet comprises a slot or plurality of slots extending around substantially the entire periphery of the duct section in a plane normal to the direction of the primary air flow.
  • Preferably, in one particular embodiment, the guide vanes are arranged to be pivotable about their longitudinal dimension transverse to the direction of the air movement whilst remaining in the parallel relationship.
  • In an alternative construction, the nozzle is pivotable about an axis substantially aligned with the periphery of the duct section to incline the vanes at an angle to the flow direction of the combined air flows. In this arrangement the nozzle is pivotable by up to 20° from the axis of the duct section, and preferably up to 10°.
  • In a preferred embodiment, the periphery of the inlet side of the nozzle is profiled, in cross-section, to provide a curved inlet edge to provide a smooth transition of the internal surface of the duct section for the air flow from the primary duct section through the guide vanes irrespective of the angular displacement of the nozzle.
  • A preferred embodiment of the present invention is shown in the accompanying drawings in which:-
    • Figure 1 shows a schematic cross-sectional view of a duct section with a guide nozzle inclined at an angle to the axis of a primary part of the duct section and hence the air flow passing through, to deflect the air flow,
    • Figure 2 illustrates the duct section of figure 1 in which the nozzle axis is correctional with that of the primary duct section,
    • Figure 3 shows a schematic part sectional perspective view of the duct section in which the guide vanes of the nozzle have been omitted in the interests of clarity, and
    • Figure 4 is a schematic illustration using bubbles indicative of the air flow to indicate the air flow through the duct section and the nozzle.
  • Referring now to Figure 1 there is shown a schematic cross-sectional view of a duct section 1 which consists of an duct inlet section 2 for a fan driven primary air flow moving in the direction indicated by the arrow 3 and, downstream of the duct inlet section 2 a nozzle 4 which is spaced from the inlet duct section 2 to provide a peripheral air inlet 5 through which, in operation, the primary air flowing past the peripheral air inlet 5 entrains air from outside the duct section 1 to provide a secondary flow 8 into the nozzle so that a combination of the primary air flow and the secondary air flow passes through the nozzle 4. In another embodiment, the peripheral air inlet 5 comprises a slot or plurality of slots extending around substantially the entire periphery of the duct inlet section 2 in a plane normal to the direction of the primary air flow.
  • The greater flow of air formed by the combination of the two flows generates a venturi effect through the nozzle 4 which speeds up the flow of air through the nozzle.
  • As shown in cross-section in Figures 1 and 2 the nozzle 4 has three guide vanes 6 arranged in spaced parallel relationship and extending transversely across the duct section 1 to guide the air flow. In cross-section, the vanes 6 have an aerodynamic profile to minimise turbulence as the air passes through the nozzle 4. In the embodiment of the invention shown in Figure 1, the nozzle 4 is arranged to pivot about a point 7 adjacent the periphery of the duct inlet section 2 to deflect the flow of air at an angle to the inlet flow of primary air as indicated by the arrows 3 in the duct inlet section. This arrangement has the effect that secondary air entering adjacent the pivot point 7 travels at a different speed than the secondary air drawn in at other points on the periphery, particularly at a point 180° spaced from this pivot point 7, where the peripheral gap is wider. This speed difference can be used to bring about change in the flow direction. This has advantages in directing the flow leaving the nozzle 4.
  • The periphery of the nozzle 4 has a profile in cross section which has the same or slightly smaller internal diameter than that of the duct inlet section 2 and on the upstream edge 9 of the nozzle the profile is curved outwardly radially as shown to provide a smooth transition for both the primary and the secondary air flows into the nozzle 4.
  • The referring now also to Figure 3, there is shown a part sectional view of the duct section in which the vanes in the nozzle have been removed from the nozzle in the interests of clarity. The arrows 8 indicate the secondary air flow passing into the interior of the duct section 1 to combine with the primary air flow as both the air flows pass through the nozzle 4.
  • Figure 4 illustrates schematically, by means of bubbles, the general disposition of the air flows. The primary air flow 3 enters the duct section 1 in the direction of the arrow 3and the secondary air flow 8 passes through the secondary air gap 5 to combine with the primary air flow so a much greater volume of air passes through the nozzle 4 as indicated by the density of the bubbles. Thus, a venturi effect through the nozzle is generated.
  • It will be understood that different embodiments of the nozzle 4 may arrange for the guide vanes to be pivoted in a different manner. For example, the nozzle could be pivoted about a transverse axis located on the axial axis of the duct section 1 so that the peripheral air inlet 5 has a reduced gap at one edge and an increased gap at the edges located 180° apart when it is tilted. It is also possible for the vanes to be connected via a linkage arrangement movable to tilt the vanes simultaneously whilst retaining them in spaced parallel relationship. Although three vanes are shown it will be understood that the number of vanes provided would depend upon the requirements of the particular installation and could therefore be one or more. Although shown as circular in cross-section, it will be understood that the duct could have a square, rectangular or other cross section.

Claims (7)

  1. A duct section for an air movement duct, comprising a duct inlet section (2) having a primary air inlet for a fan driven primary air flow, the duct section (1) further having a peripheral air inlet (5) downstream of the primary air inlet through which a secondary air flow (8) is drawn into the duct section (1) by entrainment by the passing primary air flow (3) to form a combined air flow of both the primary and the secondary air flows, a nozzle (4) comprising a guide vane arrangement being located downstream of the peripheral air inlet (5) so as to be impinged by and to direct the combined air flows, wherein the guide vane arrangement of the nozzle (4) comprises a plurality of guide vanes (6) in spaced parallel relationship and extending transversely across the duct section (1).
  2. A duct section for an air movement duct according to claim 1, wherein the nozzle (4) comprises a further part of the duct section (1) spaced from the duct inlet section (2) to form the peripheral air inlet (5) therebetween.
  3. A duct section for an air movement duct according to claim 1 wherein the peripheral air inlet (5) comprises a slot or plurality of slots extending around substantially the entire periphery of the duct inlet section (2) in a plane normal to the direction of the primary air flow.
  4. A duct section for an air movement duct according to claims 1, 2 or 3, wherein the guide vanes (6) are elongate and arranged to be pivotable about their longitudinal dimension transverse to the direction of the air movement whilst remaining in the parallel relationship.
  5. A duct section for an air movement duct according to claim 4, wherein the nozzle (4) is pivotable about an axis (7) substantially aligned with the periphery of the duct section (2) to incline the vanes at an angle to the flow direction of the combined air flows to deflect and guide the airflows.
  6. A duct section for an air movement duct according to claim 5, wherein the nozzle (4) is pivotable by up to 20° from the axis of the primary airflow duct inlet section (2).
  7. A duct section for an air movement duct according to any one of the preceding claims, wherein the periphery of the inlet side of the nozzle (4) is profiled, in cross-section, to provide a curved inlet edge forming a smooth transition of the internal surface of the duct section (2) for the air flow from the primary duct section through the guide vanes (6) irrespective of the angular displacement of the nozzle.
EP16187554.7A 2015-09-10 2016-09-07 Duct section for an air movement duct Active EP3144599B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1516029.4A GB2542165B (en) 2015-09-10 2015-09-10 Duct section for an air movement duct

Publications (2)

Publication Number Publication Date
EP3144599A1 true EP3144599A1 (en) 2017-03-22
EP3144599B1 EP3144599B1 (en) 2020-11-04

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ID=54362958

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Application Number Title Priority Date Filing Date
EP16187554.7A Active EP3144599B1 (en) 2015-09-10 2016-09-07 Duct section for an air movement duct

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EP (1) EP3144599B1 (en)
DK (1) DK3144599T3 (en)
ES (1) ES2848979T3 (en)
GB (1) GB2542165B (en)
PT (1) PT3144599T (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112539466B (en) * 2020-09-28 2022-09-02 Tcl空调器(中山)有限公司 Air guide mechanism and air conditioner indoor unit

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3981326A (en) * 1974-02-28 1976-09-21 Mitco Corporation Induction mixing nozzle
US4191098A (en) * 1977-05-21 1980-03-04 Kessler & Luch Gmbh Nozzle for air conditioning units
US4255176A (en) * 1979-08-20 1981-03-10 Lawrence Macrow Combined air purifier and destratifier
DE102006030662A1 (en) * 2006-07-04 2008-01-17 Peter Fuchs Ceiling air inlet i.e. injector mixing nozzle, for ventilation and air conditioning system, has jalousie flaps, in which air quantity is regulated, and specific suitable air grille is provided, via which room air is supplied
US20120292407A1 (en) * 2011-05-20 2012-11-22 Dyna-Tech Sales Corporation Aspirating induction nozzle

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL262265A (en) * 1960-03-11 1900-01-01
GB2135442A (en) * 1983-02-24 1984-08-30 Howorth Air Eng Ltd Air supply duct
FI92350C (en) * 1991-04-11 1994-10-25 Suomen Puhallintehdas Oy Air duct or similar connection part
FR2837915B1 (en) * 2002-03-26 2006-12-08 Spirec DEVICE FOR TREATING PULSE AIR IN A LOCAL

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3981326A (en) * 1974-02-28 1976-09-21 Mitco Corporation Induction mixing nozzle
US4191098A (en) * 1977-05-21 1980-03-04 Kessler & Luch Gmbh Nozzle for air conditioning units
US4255176A (en) * 1979-08-20 1981-03-10 Lawrence Macrow Combined air purifier and destratifier
DE102006030662A1 (en) * 2006-07-04 2008-01-17 Peter Fuchs Ceiling air inlet i.e. injector mixing nozzle, for ventilation and air conditioning system, has jalousie flaps, in which air quantity is regulated, and specific suitable air grille is provided, via which room air is supplied
US20120292407A1 (en) * 2011-05-20 2012-11-22 Dyna-Tech Sales Corporation Aspirating induction nozzle

Also Published As

Publication number Publication date
GB2542165A (en) 2017-03-15
GB2542165B (en) 2020-06-03
GB201516029D0 (en) 2015-10-28
EP3144599B1 (en) 2020-11-04
DK3144599T3 (en) 2021-02-08
ES2848979T3 (en) 2021-08-13
PT3144599T (en) 2021-02-09

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