US3865021A - Air injecting apparatus for air conditioners or the like - Google Patents

Air injecting apparatus for air conditioners or the like Download PDF

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Publication number
US3865021A
US3865021A US35647873A US3865021A US 3865021 A US3865021 A US 3865021A US 35647873 A US35647873 A US 35647873A US 3865021 A US3865021 A US 3865021A
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US
United States
Prior art keywords
air
damper
air inlet
inlet assembly
lever arm
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
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English (en)
Inventor
Lepeleire Guido Amandus De
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.)
Danfoss AS
Original Assignee
Danfoss AS
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Publication date
Application filed by Danfoss AS filed Critical Danfoss AS
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Publication of US3865021A publication Critical patent/US3865021A/en
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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
    • F24F13/02—Ducting arrangements
    • F24F13/06—Outlets for directing or distributing air into rooms or spaces, e.g. ceiling air diffuser
    • F24F13/072—Outlets for directing or distributing air into rooms or spaces, e.g. ceiling air diffuser of elongated shape, e.g. between ceiling panels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
    • F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
    • F24F11/745—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity the air flow rate increasing with an increase of air-current or wind pressure
    • 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
    • F24F13/24—Means for preventing or suppressing noise
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/7722—Line condition change responsive valves
    • Y10T137/7837—Direct response valves [i.e., check valve type]
    • Y10T137/7898—Pivoted valves
    • Y10T137/7903—Weight biased

Definitions

  • valve plate [51] Int. Cl. F241 13/10 forms one lever of fulcrumed lever and the 531 n w f Search M 93 40 10 1 13 4,0 0nd lever arm thereof is counterweighted. Weights on 9 37; 7 527 5273; 9 /39 9 H6 the second lever arm balance the biasing forces of pressurized air in the chamber which tend to move the valve plate in closing direction.
  • the invention relates to an air injecting apparatus for air conditioners or the like, comprising an injection orifice through which a variable volume of air passes.
  • the object of the invention is to provide an air injecting apparatus of the aforementioned kind in which the described disadvantages can be entirely or partially avoided with a mechanically simple construction.
  • the size of the injection orifice is adjustable in relation to the angular position of a lever having a pressure plate which is subjected to the pressure of the injected air in a chamber upstream of the injection orifice in one direction of rotation and to a mechanical force in the opposite direction of rotation.
  • the set orifice is controlled in dependence on the pressure of the injected air in the upstream chamber.
  • the speed ofinjection varies in accordance with this pressure and the size of the injection orifice and it is this injection speed that is largely responsible for the disadvantages that have hitherto been observed.
  • the control of the size ofthe injection orifice makes it possible to take into account other parameters which influence the flow in the room.
  • the lever subjected to the pressure and the me chanical force gives rise to a condition of equilibrium which determines the size of the injection orifice in a simple manner.
  • the pressure plate bounds one side of the upstream chamber and carries at its free end a limiting edge of the injection orifice.
  • the lever here serves to bound directly the upstream chamber and the injection orifice.
  • the limiting edge can here be formed by an end wall which adjoins the pressure plate and extends substantially perpendicular thereto. This end wall will then exert no torque on the lever. This will be so if the end wall is part ofa cylinder having its axis coincident with the rotary axis of the lever.
  • the limiting edge be sharp-edged by means of a chamfer on the side of the end wall remote from the rotary axis of the lever. This to a large extent suppresses disruptive torques emanating from the limiting edge.
  • a lever has proved particularly suitable which has two arms, one of which comprises the pressure plate and the other of which is subjected to the mechanical load.
  • a construction which is particularly less prone to disturbance is one where the mechanical force is formed by a weight. This weight can be adjustable along the second arm, whereby an accurate adjustment of the apparatus is made possible on site.
  • control there are various possibilities of control that can be used depending on the nature of the disturbing influence that is to be removed. There are also possibilities of combination, e.g. such that in one limiting range a first control function predominates and in another limiting range a second control function predominates.
  • this control function is achieved if the second arm carrying the weight extends substantially horizontally because changes in the angular posi tion of the lever have little influence on the torque occasioned by the weight.
  • the torque exerted on the lever by the mechanical force is dependent on the angular position of the lever in such a way that the size of the injection orifice is substantially proportional to the pressure in the upstream chamber.
  • the archimediam number of the injected air can be kept substantially constant if its temperature remains unchanged. If the flow of air extends partially along the ceiling of the room utilising the Coanda effect during normal operation, one can in this way prevent the flow from leaving the ceiling when the archimedian number exceeds a critical value.
  • control consists in that the torque exerted on the lever by the mechanical force is dependent on the angular position of the lever in such a way that the size of the injection orifice changes substantially inversely proportionally to the square of the pressure in the upstream chamber.
  • this control function the air flow maintains a particular course even if the volume of injection changes. This is particularly so for injection orifices in the form of a horizontal gap lying substantially in a vertical plane.
  • This construction also has the advantage that the second arm and the weight can be conveniently accommodated in the interior of the air injecting apparatus.
  • the pressure plate will extend substantially horizontally. But there are also constructions, e.g. for injection orifices from which the air flows upwardly, in which an upwardly directed pressure plate must be provided. In this case a counterweight balancing out the weight of the pressure plate should be provided on the lever below the rotary axis.
  • the rotary axis is provided at the end of a wall of the housing upstream of the pressure plate and an extension of this way surrounding the rotary axis forms between itself and the axis a gap which is directed so that leakage air leaves it substantially parallel to the pressure plate.
  • This leakage air will in that case create no more than a negligible disruptive torque. If there is to be even less leakage air, it is recommended that the gap between the rotary axis and the adjoining wall of the housing be covered by a thin sealing diaphragm.
  • the pressure plate may comprise two side walls extending up to. the end wall and overlapped in the region of the rotary axis by side walls of the housing.
  • the fixed limiting edge of the injection orifice be bounded by a fixed end wall extending substantially parallel to the movable end wall.
  • FIG. 1 is a diagrammatic representation through a room equipped with an air injecting apparatus according to the invention
  • FIG. 2 is a diagrammatic representation of a modified example
  • FIG. 3 is a diagrammatic representation of a third example
  • FIG. 4 shows the outside of an air injecting apparatus to be mounted near the ceiling
  • FIG. Si an enlarged view of a seal between the housing and the lever axis
  • FIG. 6 is a diagrammatic representation of a further embodiment having an upwardly directed injection orifice
  • FIG. 7 is a further modification.
  • a room 1 is provided with air at a predetermined temperature through a supply conduit 2.
  • the air is withdrawn again through a conduit 3.
  • a thermostat 4 in the room 1 controls a throttle element 5 so that a control of the injected volume is achieved in dependence on the required cooling load.
  • an air injecting apparatus 6 which is in this case in the form of a wall mounting unit.
  • This apparatus 6 comprises an injection orifice 7 and a chamber 8 upstream thereof which also acts as a sound suppresser by reason of being cladded with an insulating layer 9.
  • An important component of the air injecting apparatus is a lever 10 with the air of which the size of the injection orifice 7 can be varied.
  • the lever 10 is pivotable about an axis 11.
  • One lever arm is in the form ofa pressure plate 12 at the free end of which there is provided an end wall 13. This has the shape of a cylinder of which the axis coincides with the rotary axis 11.
  • the upper edge of the end wall 13 is provided with a chamfer 14 at the outside and forms a sharp limiting edge 15 of the injection orifice 7.
  • the upper fixed limit is formed by a wall surface 16.
  • a second lever arm 17 is in the form of a rod which carries a weight 18 that is adjustable along the rod.
  • the lower wall 19 of the apparatus 6 has an extension 20 which surrounds the rotary axis 11 and, together with it, forms a gap 21 through which leakage air can flow out substantially only parallel to the pressure plate 12.
  • FIG. 2 illustrates an operating condition at which the injected air enters the room 1 with an injection speed v. By changing the size of the injection orifice 7 and a corresponding change in the pressure p the injection speed v will also change. It can be shown that the following condition will to a large extent apply:
  • FIG. 1 use is made of a lever 10 for which 01,, 0. This ensures that on a change in the injected volume the injection orifice 7 will be enlarged to such an extent that the pressure p, and thus also the speed v remain substantially constant. This speed can be set by adjusting the weight 18 along the rod 17. There is no difficulty in keeping it below the critical value that leads to disturbing noises.
  • the angle a is positive.
  • a higher pressure p and thus a higher speed v is therefore associated with a smaller size of the injection orifice 7.
  • FIG. 3 shows an embodiment in which the injection orifice 7 extends at a very small spacing below the ceiling of the room. This results in a flow according to the line d because the injected air will adhere to the ceiling as a result of the Coanda effect. This, however, will only apply as long as a critical limiting value of the archimedian number A for the Coanda effect is not exceeded.
  • This archimedian number is defined as follows:
  • Ar g B02 1) l/v wherein, apart from the aforementioned injection speed v and the height 1 of the gap, g is the gravitational constant, ,8 is the coefficient of volumetric expansion of the air, 2 is the room temperature, and t, is the injection temperature.
  • This archimedian number is kept substantially constant if the height 1 of the gap is changed in proportion to v This can be substantially achieved by prescribing a negative angle a of rest.
  • the lever With an increase in pressure p and thus an increased injection speed v, the lever will be set to a new condition of equilibrium at which the injection orifice 7 is larger.
  • the pressure plate 12 is integrally bent to a bounding surface 22 for the orifice 7.
  • FIG. 4 illustrates an air injecting apparatus 6 to be accommodated in the ceiling and of which only the lower portion 23 is disposed below the level D of the ceiling.
  • the limiting surfaces of the apparatus 6 are again bounded by sound-proofing walls 9.
  • the lever 10 is not only provided with an end wall 13 but also with side walls 24 which are overlapped by the side walls 25 of the housing.
  • FIG. 5 shows a different kind of seal between the rotary axis 11 and the adjacent wall 19 of the housing.
  • a thin diaphragm 26 covers the gap between the said parts.
  • FIG. 6 shows what measures must be taken if the pressure plate 12 extends vertically upwardly because an upwardly directed flow is to pass through the outlet 7.
  • a further lever arm provided with a weight 27. This weight balances out the weight of the pressure plate 12 so that stable operating conditions will obtain and the weight 18 will, as in previous cases, give rise to a torque which acts against the torque produced by the pressure p,.
  • the torque produced by the pressure plate 12 can be taken into account by a portion of the weight 18.
  • the chamber 8 upstream of the injection orifice 7 is enlarged in that the wall 9 in the region of the orifice 7 comprises a downwardly projecting end surface 28. This ensures that the speed in the upstream chamber 8 is in any case considerably lower than the injection speed v without the apparatus requiring an excessively large constructional height beneath the orifice 7.
  • the weight 18 can bring about a certain functional relationship between the counter-torque and the angular position of the lever 10 with the aid of a mechanical force.
  • the mechanical force can be produced by a spring.
  • springs having a non-linear characteristic will be particularly applicable.
  • An air conditioning system air inlet assembly comprising an air flow duct, a damper forming a variable outlet orifice for said duct, said damper being mounted for pivotal movement relative to a. horizontally extending axis, said damper being movable in an opening direction by pressurized upstream air in said duct, mechanical means biasing said damper in a closing direction, said mechanical means having an angular relationship with said damper to vary the size of said orifice in accordance with the pressure of said pressurized air to maintain a constant air velocity at said orifice, said duct extending horizontally, and said damper having a flat portion below and in generally parallel relation to a portion of said duct.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Air-Flow Control Members (AREA)
  • Duct Arrangements (AREA)
US35647873 1972-05-05 1973-05-02 Air injecting apparatus for air conditioners or the like Expired - Lifetime US3865021A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2222060A DE2222060C3 (de) 1972-05-05 1972-05-05 Lufteinblasvorrichtung für Klimaanlagen o.dgl

Publications (1)

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US3865021A true US3865021A (en) 1975-02-11

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US35647873 Expired - Lifetime US3865021A (en) 1972-05-05 1973-05-02 Air injecting apparatus for air conditioners or the like

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US (1) US3865021A (it)
DE (2) DE2264489B2 (it)
GB (1) GB1426772A (it)
IT (1) IT1045876B (it)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3978777A (en) * 1975-02-24 1976-09-07 Nett Louis A Ventilating apparatus
US4047519A (en) * 1975-02-24 1977-09-13 Nett Louis A Ventilating apparatus
WO1987004507A1 (en) * 1986-01-23 1987-07-30 Halton Oy Intake air disperser
US4823679A (en) * 1988-04-29 1989-04-25 Robbins R Ralph Building ventilation system with air inlet flap control
US5195927A (en) * 1991-08-05 1993-03-23 Raydot, Incorporated Air intake apparatus for inner wall
US5569078A (en) * 1995-03-06 1996-10-29 Colorado State University Research Foundation Air diffuser having fixed and variable outlet ports
CN102914035A (zh) * 2012-10-19 2013-02-06 苏州市时代工程咨询设计管理有限公司 隐形送风口装置
US20170052045A1 (en) * 2015-08-20 2017-02-23 Sanyo Denki Co., Ltd. Measurement device

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3135142A1 (de) * 1981-09-04 1983-03-24 Ltg Lufttechnische Gmbh, 7000 Stuttgart Verfahren, einrichtung und anlage zur lueftung und temperierung von raeumen
DE3446773A1 (de) * 1984-12-21 1986-07-03 Süddeutsche Kühlerfabrik Julius Fr. Behr GmbH & Co KG, 7000 Stuttgart Gehaeuse fuer eine heizungs- oder klimaanlage eines fahrzeuges
GB8529444D0 (en) * 1985-11-29 1986-01-08 Coal Industry Patents Ltd Dampers
DE29816350U1 (de) 1998-09-11 1999-01-21 Baehr, Andreas, 22453 Hamburg Vorrichtung zur Luftableitung aus Luftausgabeeinheiten von Klimaanlagen
ATE257932T1 (de) * 2000-03-02 2004-01-15 Trox Gmbh Geb Volumenstromregler, insbesondere für klimatechnische anlagen

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3095799A (en) * 1960-03-10 1963-07-02 Iron Fireman Webster Inc Air conditioning system
US3171343A (en) * 1962-10-19 1965-03-02 Acme Mfg Company Means for discharging or exhausting air from the interior of a building
US3479947A (en) * 1968-01-15 1969-11-25 Chore Time Equipment Ventilator unit
US3541945A (en) * 1969-02-26 1970-11-24 Acme Mfg Co Hooded exhaust vent
US3668999A (en) * 1970-09-21 1972-06-13 American Warming Ventilation Fluid back pressure damper
US3680329A (en) * 1971-02-18 1972-08-01 Emhart Corp Pressure equalizing valve

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3095799A (en) * 1960-03-10 1963-07-02 Iron Fireman Webster Inc Air conditioning system
US3171343A (en) * 1962-10-19 1965-03-02 Acme Mfg Company Means for discharging or exhausting air from the interior of a building
US3479947A (en) * 1968-01-15 1969-11-25 Chore Time Equipment Ventilator unit
US3541945A (en) * 1969-02-26 1970-11-24 Acme Mfg Co Hooded exhaust vent
US3668999A (en) * 1970-09-21 1972-06-13 American Warming Ventilation Fluid back pressure damper
US3680329A (en) * 1971-02-18 1972-08-01 Emhart Corp Pressure equalizing valve

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3978777A (en) * 1975-02-24 1976-09-07 Nett Louis A Ventilating apparatus
US4047519A (en) * 1975-02-24 1977-09-13 Nett Louis A Ventilating apparatus
WO1987004507A1 (en) * 1986-01-23 1987-07-30 Halton Oy Intake air disperser
US4823679A (en) * 1988-04-29 1989-04-25 Robbins R Ralph Building ventilation system with air inlet flap control
US5195927A (en) * 1991-08-05 1993-03-23 Raydot, Incorporated Air intake apparatus for inner wall
US5569078A (en) * 1995-03-06 1996-10-29 Colorado State University Research Foundation Air diffuser having fixed and variable outlet ports
CN102914035A (zh) * 2012-10-19 2013-02-06 苏州市时代工程咨询设计管理有限公司 隐形送风口装置
US20170052045A1 (en) * 2015-08-20 2017-02-23 Sanyo Denki Co., Ltd. Measurement device
US10036660B2 (en) * 2015-08-20 2018-07-31 Sanyo Denki Co., Ltd. Measurement device having variable opening orifice for measuring airflow volume and ventilation resistance of wind blowing apparatus

Also Published As

Publication number Publication date
DE2264489B2 (de) 1976-10-28
GB1426772A (en) 1976-03-03
DE2222060B2 (de) 1977-12-01
DE2222060A1 (de) 1973-11-15
DE2222060C3 (de) 1978-07-27
IT1045876B (it) 1980-06-10
DE2264489A1 (de) 1973-11-08

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