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

Definitions

• the invention relates to an air outlet for a ventilation system for ventilation of rooms, in particular hall-like rooms, which is arranged in each case at the outlet of an air supply duct and with at least one propelling nozzle for a propelling air jet and an exit field adjacent to the propelling nozzle for trailing air to be extracted from the air guiding duct , which has a plurality of outlet openings.
• the invention has for its object to improve an air outlet of the type mentioned in such a way that the kinetic energy provided by the propellant nozzle is essentially only available for the acceleration and transport of the drag air, without this resulting in a significant vortex the room air is induced.
• this object is achieved in that at least one lateral shield, which extends approximately in the beam direction and which at least partially covers the outlet region of the driving nozzle against the ingress of room air, is assigned to at least the driving nozzle.
• the propellant nozzle usually several propellant nozzles are assigned to each air outlet, the result is that the kinetic energy of the air jets emerging from the propellant nozzles primarily extracts drag air from the exit field and practically all of the air made available via the air supply duct to far in the to be ventilated
• the arrangement is expediently such that about 10 to 30% of the amount of air to be supplied via the air supply point is introduced into the room via the driving nozzle and correspondingly 90 to 70% via the outlet field. Since practically no induction is exerted on the room air at rest, up to twenty times the volume of the room per unit time can be circulated draft-free only via the air outlet. While it is fundamentally possible to effect the shielding by means of a guide plate or the like. In one embodiment of the invention it is provided that the shielding is at least partially formed by a channel-like extension of the air outlet which projects beyond the outlet plane of the propellant nozzle in the jet direction and which at least has a part of the exit field for the drag air.
• the propellant air jets emerging from the propellant nozzles can at least partially expand and, because of the pressure conditions within the channel-like extension, practically exclusively drag air from the exit field is entrained by the propellant air jets. It is only at a greater distance from the exit field that room air is induced, albeit slightly. It is particularly expedient here if the exit field is designed in the form of a channel-like extension and at least partially surrounds the driving nozzle.
• the exit field is at least partially oriented substantially perpendicular to the jet axis of the driving nozzle.
• At least a part of the exit field is oriented at an angle to the jet axis of the driving nozzle, the exit openings facing the jet axis.
• This arrangement improves the mixing of the towing air with the driving air. It is expedient here if the outlet plane of the outlet openings of the outlet field are aligned approximately parallel to the outlet plane of the driving nozzle.
• the driving nozzle is mounted so as to be adjustable with respect to its jet axis.
• the advantageous possibility given to meet different operating requirements with standard components When the cold air is fed into the space to be ventilated, the propellant nozzle will be arranged below the exit field, the jet axis of the propellant nozzle then being deflected somewhat upward, the exit field being expediently arranged above the propellant nozzle and thus the entrained air from the propellant jet the room is "carried".
• the arrangement is expediently made the other way round, so that one above the
• the free passage cross section of the part of the outlet field which is to be attributed to the driving nozzle is larger than that of the driving nozzle, but has a higher passage resistance.
• the exit field is expediently formed by a perforated plate.
• the backflow resistance of such a perforated plate is sufficient even in the case of relatively large individual diameters of the holes to create the necessary differences in the penetration resistance between the driving nozzle and the exit field.
• Another advantage here is that large-area exit fields can be created in a simple manner, into which corresponding propulsion nozzles are then inserted.
• FIG. 1 is a side view of an air outlet, partially in section
• Fig. 2 is an end view of the air outlet acc. 1 in an embodiment with several driving nozzles
• Fig. 3 shows another arrangement of the air outlet acc. Fig. 2,
• FIG. Fig. 1 shows another embodiment of the air outlet according to FIG. Fig. 1
• Air outlet acc. 1 with only one driving nozzle, partly in section,
• Fig. 6 is an end view of the air outlet acc. Fig. 5,
• FIG. 7 shows a further embodiment of an air outlet, partly in section
• Fig. 8 is an end view of the air outlet acc. Fig. 7,
• FIG. 9 shows in section a modification of the air outlet according to FIG. Fig. 7.
• the air outlet shown in a side view in FIG. 1 and in a front view in FIG. 2 is designed as a closing component 1 for an outlet at an air supply duct 2.
• the air outlet is essentially formed from a plurality of driving nozzles 3 for generating driving jets, which can be pivoted, so that the jet axis 1 of the driving jet generated in each case can be adjusted in its angular position.
• the driving nozzles 3 are assigned an exit field 4 for trailing air, which is formed, for example, by a perforated plate and which is located above the level of the driving nozzles 3 in the exemplary embodiment shown. In Fig. 2 the perforated plate is shown schematically by the cross hatching shown.
• the exit field is designed so that its surface extends not only above the outlet nozzles 3 but also clearly on both sides into the room. If supply air is now applied to the air supply duct 2, part of this air enters the room through the propellant nozzles 3 in the form of several propellant jets. The other part of the air is introduced into the room via the outlet field.
• the passage cross sections of the driving nozzles on the one hand and the total cross section of the outlet field 4 on the other hand and the corresponding flow resistances of the driving nozzles 3 on the one hand and the outlet field 4 on the other hand are matched to one another in such a way that the flow velocity of the driving jets in the region of the nozzle mouth is approximately two is up to five times as high as the towing air emerging from the exit field 4.
• Such an air outlet is introduced into the room to be ventilated at a corresponding distance above the floor, in the case of a workshop to be ventilated, for example at a height of over three meters into the room.
• a shield 5 for example in the form of a cover plate, so that primarily the trailing air emerging from the exit field 4 is carried along by the propellant jets into the room.
• the propellant jets can expand upwards and take almost exclusively entrained air out of the exit field, with the entrained air only mixing to a small extent room air into the supply air introduced in this way due to the relatively low flow velocity.
• the speeds can be set so that the arrangement acts like a source ventilation.
• a flow velocity of the air in the driving jets of, for example, 5 to 20 m / sec and a flow velocity the drag air of 1 to 4 / sec, measured in each case in the outlet plane, then results in isothermal operation an average speed of the supply air at a distance of about 5 m from the relevant outlet surface of the air outlet of about 30-120 cm / sec.
• the drag air is carried into the room by the propulsion jets.
• the air outlet can also be arranged in reverse, which is particularly useful when warm air is supplied to a high hall.
• the shield 5 is then arranged above, the beam axis 7 is pivoted downward, so that the warm air emerging from the outlet rock 4 is "pressed" down into the room.
• a shield of the propellant nozzle 3 is provided in the form of a channel-like extension 6, the end face of which forms the exit field 4, so that the exit plane of the exit field 4 is the exit plane of the propellant nozzle 3 protrudes in the beam direction.
• FIGS. 5 and 6 an embodiment is shown with a single nozzle that has a narrow construction, the outlet field 4 being arranged only above the driving nozzle 3.
• the shield 5 which covers the area of the driving nozzle downwards, a corresponding cover 5.1 is also provided on both sides, which also prevents the lateral entry of room air.
• the embodiment shown in FIGS. 5 and 6 can also be arranged according to FIG. Fig. 3 to be built in.
• FIG. 7 and 8 is a further embodiment of the construction 'acc. Fig. 4 in a vertical section (Fig .. 7) and in one
• the exit field in the form of a channel-like extension surrounds the driving nozzles 3 overall in a channel-like manner, this embodiment also being able to be designed on the basis of a driving nozzle.
• the channel-like extension 6, which at the same time forms the shielding of the driving nozzle 3, is designed in such a way that the exit plane of the exit field 4 is oriented at an angle to the jet axis 7, the exit openings of the exit field facing the jet axis 7.
• the outlet field 4 in the form of a perforated plate, so that the outlet openings are directed towards the jet axis.
• the outlet openings of the outlet field 4 it is also possible, as shown here, for the outlet openings of the outlet field 4 to be in the form of a multiplicity of small scoops 8, the outlet planes of which are arranged approximately parallel to the outlet plane of the driving nozzle 3.
• the shield 5 for example in the embodiments according to FIGS. 1 to 4, can be changed in the orientation to the beam axis, in particular pivotally connected to the end component 1. This means that even after installation
• the shield 5 can also be formed by a plate provided with perforations at least over part of its surface instead of a full-surface plate. If, for example, the perforation is arranged in the region of the free end edge of the shield, air can already be mixed in from the shielded region.

Landscapes

• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Ventilation (AREA)
• Duct Arrangements (AREA)
• Self-Closing Valves And Venting Or Aerating Valves (AREA)
• Air-Flow Control Members (AREA)
• Air-Conditioning For Vehicles (AREA)
• Cooling Or The Like Of Electrical Apparatus (AREA)
• Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=6894986

Family Applications (1)

Country Status (6)

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Family Cites Families (5)

• 1993
  • 1993-06-30 DE DE9309677U patent/DE9309677U1/de not_active Expired - Lifetime
• 1994
  • 1994-06-21 PL PL94307569A patent/PL307569A1/xx unknown
  • 1994-06-21 WO PCT/EP1994/002013 patent/WO1995001537A1/fr not_active Ceased
  • 1994-06-21 AT AT94919647T patent/ATE172532T1/de not_active IP Right Cessation
  • 1994-06-21 DK DK94919647T patent/DK0657014T3/da active
  • 1994-06-21 DE DE59407124T patent/DE59407124D1/de not_active Expired - Fee Related
  • 1994-06-21 EP EP94919647A patent/EP0657014B1/fr not_active Expired - Lifetime

Non-Patent Citations (1)

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