US3916772A - Device at supply air means with throttling member - Google Patents

Device at supply air means with throttling member Download PDF

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Publication number
US3916772A
US3916772A US462778A US46277874A US3916772A US 3916772 A US3916772 A US 3916772A US 462778 A US462778 A US 462778A US 46277874 A US46277874 A US 46277874A US 3916772 A US3916772 A US 3916772A
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US
United States
Prior art keywords
air
chamber
room
flow
apertures
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.)
Expired - Lifetime
Application number
US462778A
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English (en)
Inventor
Lars-Erik Lindestrom
Birger Larkfeldt
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.)
Svenska Flaktfabriken AB
Original Assignee
Svenska Flaktfabriken 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 Svenska Flaktfabriken AB filed Critical Svenska Flaktfabriken AB
Application granted granted Critical
Publication of US3916772A publication Critical patent/US3916772A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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

Definitions

  • ABSTRACT Apparatus for supplying air from a high-pressure air duct to a room, for ventilation of the room. Air from the high-pressure source is passed through a set of nozzles spaced across the cross section of a flow chamber, the apertures of the nozzles being mutually spaced apart by a distance d and the aperture nearest the sidewalls of the chamber being spaced therefrom by substantially d/2.
  • the length of the fluid chamber is at least 3 times d, and a grating is provided across its outlet end.
  • an adjustably-sized aperture is provided in a sidewall of the chamber near the nozzles to control the quantity of secondary air pulled into the chamber from the room, and hence the velocity of flow into the room.
  • the chamber is a telescoping tube, adjustable to change the chamber length. The apparatus enables a smooth, nearly homogeneous, flow of air into the room, while permitting control of the velocity of air flow into the room, and without materially reacting on the high-pressure source of air.
  • This invention relates to a device for use with an air means comprising a throttling member with flow apertures of equally spaced-apart relationship, said throtply means without affecting the pressure drop or the flow of primary air. It was found possible by means of the device according to the invention to provide suitable throwing lengths for different depths of the ventilated rooms or to vary the throwing length as a function of the difference in temperature, or also at a so-called VAV-installation to maintain the throwing length at varying flows.
  • the device according to the invention is primarily characterized in that it comprises a flow chamber between the aforesaid throttling member and the outlet to the ventilated room, said chamber having a length sufficiently great, preferably 3 times the aforesaid relative spacing of the flow apertures, that the air jets from said apertures are spread into to one homogeneous air stream prior to the outflow out of the flow chamber.
  • the flow chamber comprises an external pipe with a grating which is mounted movably on an internal pipe surrounding said throttling member.
  • a preferred embodiment of the device is characterized in that the flow chamber is a single pipe surrounding said throttling member and provided with an opening to the ventilated room in the wall of the flow chamber near said throttling member, said opening being variable for adjusting the intended co-ejected air flow from the ventilated room and, thereby, the throwing length of the supply air means.
  • FIG. 1 shows a one-duct apparatus located adjacent a window-wall and connected to a primary air passageway, the apparatus being provided with a throttling member and a grating, and
  • FIG. 2 shows a supply air passageway through a wall terminating with a throttling member and a grating.
  • 1 designates a air supply means and 2 a throttling member with a number of flow apertures 3.
  • 4 is a flow chamber and 5 designates an outlet therefrom.
  • the flow chamber is a rectangular passageway or'a single pipe 7, which adjacent the plane through the throttling member is provided with a movable cover 8, by means of which the opening 9 can be varied by the reversible movement of the cover in the direction of the arrow 10 can be varied.
  • From the passageway 12 supply air is delivered in the form of primary air at a certain rate and tries to co-eject secondary air from the room 6.
  • the airjets of the throttling member 2 will fill up the entire crosssection of the flow chamber 4, and a minimum speed of the flow out of the mouth 5 of the chamber is obtained.
  • This minimum speed can be determined by calculation as the ratio between the primary air flow and the cross-sectional area of the chamber 4.
  • the cover 8 is opened increasingly wider, a certain amount of secondary air is taken along in the suction from the room 6, and the speed in the mouth of the flow chamber increases to the ratio between the flows of primary air plus secondary air and the aforementioned cross'sectional area.
  • the coejected flow from the room 6 was found to depend on the width of the opening 9 and on the pressure drop over the throttling member 2.
  • the present invention is based on the understanding of that, in order to ensure a good functioning of the device, Le. a so-called short circuit, the length of the flow chamber constantly is to be maintained sufficiently great that the condition L a 3 d is met where d according to above and in the claims designates the spacing between the flow apertures'S of the throttling member 2.
  • d designates the spacing between the flow apertures'S of the throttling member 2.
  • secondary air from the room 6 will be sucked into the chamber 4a, for example in the direction of the smaller arrow, where the air is mixed with primary air supplied from the passageway 12a and is ejected, for example in the direction of the larger arrow.
  • the invention renders it possible that air supply means with a relatively high pressure drop can have a short throwing length, which implies the possibility of adjusting the throwing length within certain limits in order to bring about an optimum flow pattern in a room. It may be pointed out that a change in the throwing length according to above has no effect (reaction) on the primary air system.
  • Apparatus for supplying a flow of primary air from a high-pressure air source to a room by way of an outlet to the room comprising:
  • said flow chamber comprising two telescopicallyarranged tubes, one supporting said grating and one surrounding said apertures, so as to permit adjustment of the length of said chamber by telescoping one of said tubes with respect to the other said tube, thereby to adjust the throw length of the air stream from said outlet end to said room without substantial reaction on said air supply source;
  • the length of said flow chamber being sufficient that secondary air from said room is sucked into said chamber at the edges of said grating and mixed with said primary air to form a substantially homogeneous ventilation air current into said room.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Duct Arrangements (AREA)
  • Jet Pumps And Other Pumps (AREA)
  • Air-Flow Control Members (AREA)
  • Ventilation (AREA)
US462778A 1973-05-07 1974-04-22 Device at supply air means with throttling member Expired - Lifetime US3916772A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE7306408A SE376296B (en)) 1973-05-07 1973-05-07

Publications (1)

Publication Number Publication Date
US3916772A true US3916772A (en) 1975-11-04

Family

ID=20317391

Family Applications (1)

Application Number Title Priority Date Filing Date
US462778A Expired - Lifetime US3916772A (en) 1973-05-07 1974-04-22 Device at supply air means with throttling member

Country Status (11)

Country Link
US (1) US3916772A (en))
JP (1) JPS5019245A (en))
BE (1) BE814589A (en))
CH (1) CH574087A5 (en))
DE (1) DE2420164A1 (en))
FR (1) FR2229023B1 (en))
GB (1) GB1473515A (en))
IT (1) IT1012589B (en))
NL (1) NL7405589A (en))
NO (1) NO133680C (en))
SE (1) SE376296B (en))

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USD251439S (en) 1976-12-27 1979-03-27 RSC Air Conditioning Service, Inc. Air outlet for round duct
GB2189023B (en) * 1986-04-11 1989-11-22 Hunter Int Ltd Improvements in or relating to a method of and apparatus for wall mounting a fan
CN102434952A (zh) * 2011-09-15 2012-05-02 广州约顿电子科技有限公司 一种解决大面积大空间高精度环境送风均匀性问题的方法

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5869732U (ja) * 1981-10-31 1983-05-12 株式会社アーレスティ 調和空気循環吹出装置
GB8329875D0 (en) * 1983-11-09 1983-12-14 Ryton S Ventilation Equipment Air ventilating duct
DE8709348U1 (de) * 1987-07-07 1987-09-10 Schako Metallwarenfabrik Ferdinand Schad KG Zweigniederlassung Kolbingen, 7201 Kolbingen Fensterschleiergerät zur Klimatisierung von Räumen
JP6026759B2 (ja) * 2012-03-22 2016-11-16 日本フローダ株式会社 吹出口ボックス装置
CN106143064B (zh) * 2016-08-24 2018-07-13 上海杰邦塑料五金制品有限公司 出风口阻尼器及应用了此阻尼器的出风口组件

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2783979A (en) * 1955-03-02 1957-03-05 Borg Warner Induction unit for air conditioning
US2872859A (en) * 1954-03-02 1959-02-10 Barber Colman Co Air distribution unit
US3327607A (en) * 1966-01-14 1967-06-27 Wehr Corp Air pattern control arrangement
US3422888A (en) * 1967-06-29 1969-01-21 Carrier Corp Air distribution terminal

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE567264A (en)) * 1957-04-30

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2872859A (en) * 1954-03-02 1959-02-10 Barber Colman Co Air distribution unit
US2783979A (en) * 1955-03-02 1957-03-05 Borg Warner Induction unit for air conditioning
US3327607A (en) * 1966-01-14 1967-06-27 Wehr Corp Air pattern control arrangement
US3422888A (en) * 1967-06-29 1969-01-21 Carrier Corp Air distribution terminal

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USD251439S (en) 1976-12-27 1979-03-27 RSC Air Conditioning Service, Inc. Air outlet for round duct
GB2189023B (en) * 1986-04-11 1989-11-22 Hunter Int Ltd Improvements in or relating to a method of and apparatus for wall mounting a fan
CN102434952A (zh) * 2011-09-15 2012-05-02 广州约顿电子科技有限公司 一种解决大面积大空间高精度环境送风均匀性问题的方法
CN102434952B (zh) * 2011-09-15 2015-09-09 广州约顿电子科技有限公司 一种解决大面积大空间高精度环境送风均匀性问题的方法

Also Published As

Publication number Publication date
FR2229023B1 (en)) 1978-11-24
NO133680B (en)) 1976-03-01
BE814589A (fr) 1974-09-02
NO133680C (en)) 1976-06-09
DE2420164A1 (de) 1974-11-28
GB1473515A (en) 1977-05-11
SE376296B (en)) 1975-05-12
CH574087A5 (en)) 1976-03-31
IT1012589B (it) 1977-03-10
JPS5019245A (en)) 1975-02-28
FR2229023A1 (en)) 1974-12-06
NL7405589A (en)) 1974-11-11

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