WO1994019651A1 - Appareil de ventilation - Google Patents

Appareil de ventilation Download PDF

Info

Publication number
WO1994019651A1
WO1994019651A1 PCT/GB1994/000325 GB9400325W WO9419651A1 WO 1994019651 A1 WO1994019651 A1 WO 1994019651A1 GB 9400325 W GB9400325 W GB 9400325W WO 9419651 A1 WO9419651 A1 WO 9419651A1
Authority
WO
WIPO (PCT)
Prior art keywords
grille
axis
air
openings
deflector
Prior art date
Application number
PCT/GB1994/000325
Other languages
English (en)
Inventor
Carl Pendleton
Ian Michael Brown
Original Assignee
Gilberts (Blackpool) Limited
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 Gilberts (Blackpool) Limited filed Critical Gilberts (Blackpool) Limited
Priority to AU60097/94A priority Critical patent/AU6009794A/en
Publication of WO1994019651A1 publication Critical patent/WO1994019651A1/fr

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
    • F24F13/02—Ducting arrangements
    • F24F13/06—Outlets for directing or distributing air into rooms or spaces, e.g. ceiling air diffuser

Definitions

  • This invention relates to ventilation apparatus.
  • the invention relates in particular to so-called swirl diffusers which have inclined deflection vanes. When air passes through a swirl diffuser it is deflected outwardly in a turbulent manner which aids rapid mixing, in a room.
  • EP-A-128485 describes a swirl diffuser for use as the floor outlet of a ventilation system, the diffuser having an air deflector with inclined vanes, and a grid over the air deflector.
  • the grid is a substantial part having concentric rings, between which air can pass.
  • the rings are connected by ribs, which are inclined so as not to interfere with the air eddy, passing through the circular apertures between the rings of the grid. It is stated in EP-A-128485 that the arrangement of rings and ribs is such as not to interfere with the eddy.
  • the geometry of the grid in particular the substantial depth of the rings and, consequently, of the circular apertures, is such that it may be expected that an eddy will be maintained within the air, as it flows in a direction generally axial to the diffuser.
  • the swirling air flow will be substantially unidirectional, directed into the central zone of the room. This will be undesirable in many situations, especially in confined spaces with people present.
  • ventilation apparatus for use as a room outlet of an air flow pathway in order to deflect air from a confined flow condition, along the pathway, to a dispersed condition, in the room, the apparatus comprising a deflector unit having a plurality of spaced deflector vanes arranged about a first axis, but inclined thereto for discharging air in directions transverse to the first axis, and a cover grille over the deflector unit, the cover grille including non-circular openings whose maximum dimension measured along a radius centred on said first axis is greater than their depth as measured parallel to the first axis.
  • the ventilation apparatus is preferably arranged to be fixed relative to a floor, with the cover grille substantially flush to the floor.
  • the apparatus is, when so arranged, suitably strong enough to withstand normal loads, for example, the weight of a person upon the grille, and is capable of directing an air flow across the floor. Furthermore, the only part of the apparatus which is visible to personnel within the room, namely the cover grille, is aesthetically pleasing.
  • the maximum dimension of said non- circular openings is at least one and a half times their depth and, more preferably, is at least twice their depth.
  • Said non-circular openings are preferably elongate, in the direction of a main plane of the grille.
  • an axis of elongation of said openings is not tangentially disposed relative to a circle centred on said first axis.
  • a radius centred on said first axis and passing through a median part of an axis of elongation of a said opening defines an angle x° with said axis of elongation, where 90° ⁇ x ⁇ 180°.
  • said axis of elongation is angled relative to said radius passing through said median part; that is, preferably 90° ⁇ x ⁇ 180°.
  • x is about 150°.
  • the non-circular openings are elongate in the direction of the main plane of the grille, preferably the openings have at least one pair of parallel sides which are preferably parallel to the axis of elongation.
  • the non-circular openings are preferably symmetrical about said axis of elongation and, preferably, also about an axis disposed perpendicularly to the axis of elongation in the same plane as the axis of elongation.
  • the maximum dimension of the non-circular openings in the direction of the main plane of the grille is at least 4 mm and, more preferably, at least 6 mm.
  • the minimum dimension of the non-circular openings in the direction of the main plane of the grille, suitably in a direction perpendicular to the direction of said axis of elongation is preferably less than 4 mm and more preferably less than 2 mm.
  • the minimum dimension is preferably at least 1 mm.
  • the non-circular openings of the cover grille may be identical to one another. Other openings which may be non-circular or otherwise may be provided in the cover grille.
  • the openings comprise at least 20% of the area of the grille, most preferably, at least 40%.
  • the openings constitute not more than 80% of the area of the grille, most preferably, not more than 60%.
  • the grille may be a plate with perforations.
  • the perforations preferably extend through the plate in a direction which is parallel to said first axis.
  • the walls which define the perforations preferably extend through the plate in a direction which is parallel to said first axis.
  • the thickness of the plate is preferably at least 1 mm and, more preferably, at least 2 mm.
  • the thickness of the plate is preferably less than 4 mm.
  • the spaced deflector vanes of the deflector unit are preferably arranged in a generally radial configuration about said aforementioned first axis.
  • the vanes are preferably angled upwardly at an angle y° relative to a plane extending perpendicularly to the axis.
  • angle y° is in the range 20° to 60° and, more preferably, is in the range 25° to 50°.
  • the angle y° is preferably fixed and unadjustable.
  • the vanes are preferably arranged to be moved, as a unit, in a direction parallel to the first axis. This may provide a very simple means of adjusting the flow direction of air from the apparatus. Means is provided for securing the vanes in a selected position.
  • the apparatus preferably includes adjustable damping means upstream of the vanes.
  • ventilation apparatus for use as a room outlet of an air flow pathway in order to deflect air from a confined flow condition, along the pathway, to a dispersed condition, in the room, the apparatus comprising a deflector unit having a plurality of spaced deflector vanes arranged about a first axis, but inclined thereto for discharging air in directions transverse to the first axis, and a cover grille over the deflector unit, the cover grille including a plurality of spaced apart ribs extending outwardly from a central region of the grille and a plurality of openings being provided in respective spaces defined between adjacent ribs.
  • the spaced apart ribs together with a peripheral rib which is arranged around said ribs and is connected thereto, define a plurality of enclosed regions in which said openings are provided.
  • the openings in each respective region are elongate and extend transversely to the general direction of the spaced apart ribs which define the respective region.
  • the grille of the second aspect may include any feature of the grille of the first aspect and vice versa.
  • the invention extends to a novel cover grille for a ventilation apparatus as described herein per se.
  • the ventilation apparatus of the second aspect may include any feature of the ventilation apparatus of the first aspect and vice versa.
  • the invention further extends to air conditioning apparatus comprising a ventilating apparatus in accordance with the first and/or second aspects.
  • the ventilating apparatus preferably serves as a room outlet located in a floor of a room.
  • Figure 2 is a plan view of a cover grille of the apparatus.
  • Figure 3 is a cross-section through a part of a modified ventilation apparatus.
  • the ventilation apparatus 2 comprises a deflector unit 4 and, downstream thereof, a perforated cover grille 6.
  • the deflector unit 4 comprises a central boss 8, an outer body 10, generally circular in section, and a deflector plate 11 which includes a plurality of deflector vanes 12.
  • the deflector plate 11 is screw-threadedly mounted on the boss 8 and may be screwed up and down the boss 8 in order to alter the spacing of the deflector vanes 12 from the cover grille 6.
  • Figure 1 shows the plate 11 adjacent the cover grille 6. By unscrewing the wing nut 14, the deflector plate 11 may be screwed downwardly and secured in position.
  • a stop member 18 defines the lower limit of the plate 11.
  • the deflector vanes 12 are generally radially arranged about the boss 8 but are inclined relative to the horizontal at an angle of about 30°, so that air may be deflected by the vanes 12 so as to leave the deflector unit 4 in a direction which is transverse to the elongate axis of the boss 8.
  • a hit/miss damper 20 is also mounted on the central boss 8.
  • the damper 20 fits within the lower end of the outer body 10 and comprises a lower plate 22 which is rotationally fixed to the boss 8 and an upper plate 24 which is rotatably mounted on the boss 8 and which abuts the lower plate.
  • the lower and upper plates 22, 24 include spaced apart wedge-shaped openings which may be moved into and out of register with one another by rotating the lower plate 22 relative to the upper plate. The arrangement thereby provides a simple means of controlling the quantity of air flowing out of the deflector unit 4.
  • a wing nut 26 is provided for securing the rotatable plate 22 in a selected position.
  • the central boss 8 is secured at its lower end, by means of nuts 30, 32, within a heavy duty support channel 28.
  • a dirt trap tray 34 which is fixed to the boss 8, is provided between the channel 28 and the unit 4 for preventing any dirt or other matter which enters the device 2 via the grille 6 from passing into upstream ducting.
  • the tray 34 may be periodically cleaned out, as required.
  • the upper end 34 of the boss 8 is fixed to an inner wall of the grille 6 to secure the grille in position.
  • four cylindrical internally screw-threaded sleeves 36 are fixed to the inner wall of the grille 6 at equidistantly spaced apart positions about the circumference of the grille 6.
  • Shafts 38 are secured at their lower ends to the channel 28 by means of nuts 30, 32. At the upper ends, the shafts 38 are screw-threaded and received within the internally screw-threaded sleeves 36 for further securing the grille in position.
  • the shafts 38 also carry a stepped secure ent part 40.
  • the securement part 40 may be positioned on the shaft 38 so as to wedge a floor tile 42 between itself and a lip 44 of the grille 6.
  • each of the four shafts 38 may carry a spring clip 60 (Figure 3) .
  • Each clip 60 includes a location seat 62 on which a corner 64 of a floor tile 66 may locate.
  • the provision of spring clips 60 instead of the stepped securement parts 40 enable the unit 4 to be secured in position from above.
  • a circular opening of suitable size is formed in a tile 66 and then the unit 4 moved into position from above.
  • the clips 60 pass within the circular opening, they are urged inwardly. The clips spring outwardly when they reach the position shown in Figure 3.
  • the grille 6 includes six segments 50a to 5Of, defined by spaced apart ribs 51, each of which segments includes a plurality of identical apertures 52.
  • the apertures 52 are elongate in shape, having opposing elongate walls 54 which are parallel to one another and curved end walls 56.
  • the elongate walls 54 of the apertures extend parallel to one another and each row of apertures 52 is staggered relative to the adjacent row.
  • the elongate axes of the apertures 52 in adjacent segments 50 are angled at 60° to one another and the elongate axes of the apertures 52 in radially opposite segments 50 are parallel to one another.
  • the design of the grille 6 requires a compromise between conflicting requirements. On the one hand, where the grille 6 is floor mounted, it must be able to withstand heavy loads, for example, the weight of a person. On the other hand, the effect of the grille 6 on the direction of air flowing from the apparatus 2 is preferably minimal. Although a grille as described in EP- A-128485 may be sufficiently strong to withstand heavy loads, the depth of its rings has an adverse effect on air flow.
  • the grille 6 of Figure 2 is made from a stainless steel plate of 2 mm thick.
  • the apertures 52 extend axially through the plate.
  • the size of the apertures is selected so that any adverse effect on the flow direction of air from the apparatus due to the grille 6 is minimised.
  • the maximum length "z" mm of apertures 52 measured along a radius of the grille is greater than the thickness "t" mm of the grille.
  • the dimensions of the apertures 52 are 3 mm by 8 mm. In general, this is small enough to ensure that heels of shoes, for example, do not get caught up in the grille thereby avoiding possible injury to personnel.
  • the apparatus 2 is located at the end of ducting of air conditioning apparatus and forms the outlet into a room. It will normally be located in a floor. With the deflector plate 11 located in the position shown in figure 1, air travelling along the ducting is deflected by the vanes 12 so that air is expelled from the apparatus transversely, in a turbulent swirling manner, across the floor.
  • the provision of the grille does not unduly affect the motion of the air and, in fact, may be beneficial.
  • the deflector plate 11 is spaced further from the grille, air is expelled from the apparatus more towards the vertical rather than horizontally across the floor.

Landscapes

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

Abstract

L'invention concerne un appareil de ventilation (2) utilisé, à l'arrivée d'une conduite d'air dans une pièce, pour dévier le jet d'air, compact pendant son transport, et le disperser dans cette pièce. Cet appareil comprend une unité de déflexion (4), doté de plusieurs ailettes de déflexion espacées (12) disposées autour d'un premier axe mais inclinées par rapport à lui pour déverser l'air dans des directions qui lui sont transversales, et il comprend une grille de couverture (6) recouvrant cette unité de déflexion. Cette grille de couverture (6) présente des ouvertures non circulaires dont la dimension maximum 'z', mesurée le long d'un rayon centré sur le premier axe, est supérieure à celle de la profondeur, mesurée parallèlement au premier axe.
PCT/GB1994/000325 1993-02-25 1994-02-17 Appareil de ventilation WO1994019651A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU60097/94A AU6009794A (en) 1993-02-25 1994-02-17 Ventilation apparatus

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9303768.7 1993-02-25
GB939303768A GB9303768D0 (en) 1993-02-25 1993-02-25 Ventilation apparatus

Publications (1)

Publication Number Publication Date
WO1994019651A1 true WO1994019651A1 (fr) 1994-09-01

Family

ID=10730994

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1994/000325 WO1994019651A1 (fr) 1993-02-25 1994-02-17 Appareil de ventilation

Country Status (3)

Country Link
AU (1) AU6009794A (fr)
GB (2) GB9303768D0 (fr)
WO (1) WO1994019651A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19753889C1 (de) * 1997-12-05 1999-02-25 Krantz Tkt Gmbh Bodenauslaß
FR2902369B1 (fr) * 2006-06-16 2011-05-06 Faurecia Interieur Ind Systeme de ventilation forcee de l'habitacle d'un vehicule automobile, et planche de bord correspondante.

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0446557A2 (fr) * 1990-03-14 1991-09-18 Hesco Pilgersteg AG Echappement dans un plancher pour une installation de ventilation d'une pièce

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB591207A (en) * 1945-05-02 1947-08-11 Paul Brandt An improved diffuser adapted to deliver a rotating or whirling current of air or gas
US4366748A (en) * 1981-02-06 1983-01-04 Air Components, Inc. Air diffuser
GB2269006B (en) * 1992-07-16 1996-06-05 Gilberts Ventilation apparatus

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0446557A2 (fr) * 1990-03-14 1991-09-18 Hesco Pilgersteg AG Echappement dans un plancher pour une installation de ventilation d'une pièce

Also Published As

Publication number Publication date
GB2275528B (en) 1996-10-02
GB9303768D0 (en) 1993-04-14
GB9402777D0 (en) 1994-04-06
GB2275528A (en) 1994-08-31
AU6009794A (en) 1994-09-14

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