US3174507A - Means for governing the pressure in ventilating units - Google Patents

Means for governing the pressure in ventilating units Download PDF

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Publication number
US3174507A
US3174507A US21905262A US3174507A US 3174507 A US3174507 A US 3174507A US 21905262 A US21905262 A US 21905262A US 3174507 A US3174507 A US 3174507A
Authority
US
United States
Prior art keywords
pressure
duct
main duct
damper
air
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
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English (en)
Inventor
Matts Sigvard
Ekelund Bruno
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
Priority to NL124398D priority Critical patent/NL124398C/xx
Priority to DEA40245A priority patent/DE1222223B/de
Priority to FR898342A priority patent/FR1398718A/fr
Priority to GB1991662A priority patent/GB1001560A/en
Application filed by Svenska Flaktfabriken AB filed Critical Svenska Flaktfabriken AB
Priority to US21905262 priority patent/US3174507A/en
Application granted granted Critical
Publication of US3174507A publication Critical patent/US3174507A/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
    • 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
    • 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
    • Y10T137/8593—Systems
    • Y10T137/85978—With pump
    • Y10T137/85986—Pumped fluid control
    • Y10T137/86002—Fluid pressure responsive
    • Y10T137/8601—And pilot valve
    • 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
    • Y10T137/8593—Systems
    • Y10T137/877—With flow control means for branched passages
    • Y10T137/87877—Single inlet with multiple distinctly valved outlets

Definitions

  • the present invention relates to a device in a distribution duct connected to a fan for maintaining constant the static pressure near two or several air outlets adjusted by means of dampers and located at a relatively large distance from the fan, which device consists of a pressure sensitive means and an adjustment device governed by said means.
  • the present invention is characterized in that the pressure sensitive means is connected to an extra, relatively small branch duct arranged close to the fan outlet and that in this branch duct are attached a throttling flange arranged before the opening to the pressure sensitive means, said throttling flange having a pressure-fall characteristic similar to that of the distribution duct up to the said opening and also an adjustment damper placed in the outlet of the extra branch duct, which damper is arranged to be affected by said pressure sensitive means via the adjustment device for the fan, so that the position of this adjustment damper will constantly substantially correspond to the average position of the dampers of the air outlets.
  • FIG. 1 designates the consumption end of a distribution duct 3 connected to a fan 2.
  • This is equipped with one or several damper-adjusted air outlets, for instance 4 and 5.
  • 12 indicates an adjustment device for varying of the capacity of the fan 2.
  • 6 indicates a pressure sensitive means and 7 indicates a servo- 3,174,507 Patented Mar. 23, 1965 motor controlled by the said pressure sensitive means.
  • the pressure sensitive means 6 is connected to a branch duct 3' arranged at the fan outlet.
  • the branch duct is equipped with a throttling flange 9 arranged before the opening 8 of the pressure sen sitive means 6, said flange having a pressure-fall characteristic corresponding approximately to that of the distribution duct 3 and also with an adjustment damper 11 placed at the outlet 10.
  • the damper 11 and the adjustment device 12 are governed together by said pressure sensitive means 6 via the servo-motor 7.
  • Each combination of the positions of dampers of the air outlets corresponds to a certain total air consumption. If this total consumption is small, i.e., if the air outlet dampers on an average are almost closed, the fan 2 must be throttled by means of the adjustment device 12 in order that the pressure P in the consumption end shall not rise.
  • each position of the adjustment device 12 corresponds to a certain average position for the air outlet dampers.
  • the throttling flange 9 Since the throttling flange 9 has a pressure fall characteristic which corresponds to that of the duct 3, the pressure P will thus be substantially equal to the pressure P The same effect will then be obtained with the manostat connected to P as if it was connected to P P can accordingly be maintained approximately constant in spite of the fact that the pressure sensitive means is placed in immediate proximity to the fan, for instance in the apparatus room for the fan and its adjustment devices.
  • the throttling flange ii somewhat the position for the constant pressure P; can be moved towards that of the air outlets without the need to move the manostat. Besides a simplified installation, also increased trimming possibilities are hereby gained according to the invention.
  • the throttling flange 9 in the small branch duct 3' functions to cause a pressure change which is substantially equal to that in the main duct up to a point near the air outletthe point at which the sensing means of hitherto pressure regulating devices were disposed.
  • the adjustment damper 11 functions to cause a pressure change which is substantially equal to the mean pressure change of the air outlets in their actual positions. It is, therefore, evident that the adjustment damper performs a function supplemental to that of the orifice of the throttling flange.
  • each combination of the positions of the dampers in the main air outlets corresponds to a certain total air consumption and a certain air flow in the main duct. If some of the main dampers are closed, for example, the air flow in the main duct decreases and this causes a corresponding increase in the static pressure in the main duct and in the small branch duct, whereupon the pressure responsive device 8, 6 in the small duct will sense the increase in pressure and will act through the servo-device 7 to decrease the output of blower fan 2 until the prior static pressure in the main duct is substantially restored.
  • the pressure increase in the small branch duct would not quite follow the pressure increase in the main duct because the resistance to air flow by the adjustment damper 11if not adjusted-would not correspond to pressure increase caused by the changed condition of the dampers in the main air outlets.
  • the adjustment damper 11 needs to be correspondingly a changed to a more closed position.
  • This adjustment of the damper 11 is made by the action of the pressure sensing device 6 and the servo-device 7 simultaneously with the adjustment of the blower fan output.
  • each combination of positions of the main outlet dampers corresponds to a certain air flow, which, in turn, corresponds to a certain position of the blower control device, the adjustment of the damper 11 can be regulated by the same device which controls the blower.
  • Apparatus for regulating the static pressure in a ventilating air duct system having a relatively long main duct connected to a motor driven air supply blower and having a number of branch ducts with damper regulated air outlets disposed at the outer end of the main duct, comprising, in combination, a relatively small control branch duct connected to said main duct near the blower in a manner to be responsive to static pressure in said main duct and having an air outlet at its outer end, a throttling flange arranged in said control branch duct which is constructed and arranged to cause a pressure drop in said control branch duct which is substantially equivalent to the pressure drop in the main duct up to a predetermined point near said air outlets, an adjustment damper in said control branch duct located at a distance downstream of said throttling flange to provide between them a pressure control chamber, pressure sensing means connected to said pressure control chamber and responsive to the static pressure therein, a servodevice operatively connected to said pressure sensing means, a control device responsive to said
  • Apparatus for regulating the static pressure in a ventilating air duct system having a relatively long main duct connected to a motor driven air supply blower and having a number of branch ducts with damper regulated air outlets disposed at the outer end of the main duct, comprising, in combination, a relatively small control branch duct connected to said main duct near the blower in a manner to be responsive to static pressure in said main duct and having an air outlet at its outer end, a throttling flange arranged in said control branch duct which is constructed and arranged to cause a pressure drop in said control branch duct which is substantially equivalent to the pressure drop in the main duct up to a predetermined point near said air outlets, an adjustment damper in said control branch duct located at a distance downstream of said throttling flange to provide between them a pressure control chamber, pressure sensing means connected to said pressure control chamber and responsive to the static pressure therein, and means responsive to said pressure sensing means constructed and arranged to regulate the speed of said blower and to corresponding

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Ventilation (AREA)
  • Air-Flow Control Members (AREA)
  • Duct Arrangements (AREA)
US21905262 1961-05-25 1962-08-23 Means for governing the pressure in ventilating units Expired - Lifetime US3174507A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
NL124398D NL124398C (ko) 1961-05-25
DEA40245A DE1222223B (de) 1961-05-25 1962-05-18 Druckregler fuer Lueftungseinrichtungen
FR898342A FR1398718A (fr) 1961-05-25 1962-05-22 Dispositif pour régler la pression dans les installations de ventilation
GB1991662A GB1001560A (en) 1961-05-25 1962-05-23 Means for controlling the pressure in ventilating units
US21905262 US3174507A (en) 1961-05-25 1962-08-23 Means for governing the pressure in ventilating units

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE546761 1961-05-25
US21905262 US3174507A (en) 1961-05-25 1962-08-23 Means for governing the pressure in ventilating units

Publications (1)

Publication Number Publication Date
US3174507A true US3174507A (en) 1965-03-23

Family

ID=26654634

Family Applications (1)

Application Number Title Priority Date Filing Date
US21905262 Expired - Lifetime US3174507A (en) 1961-05-25 1962-08-23 Means for governing the pressure in ventilating units

Country Status (5)

Country Link
US (1) US3174507A (ko)
DE (1) DE1222223B (ko)
FR (1) FR1398718A (ko)
GB (1) GB1001560A (ko)
NL (1) NL124398C (ko)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4597723A (en) * 1982-06-07 1986-07-01 Sember Joseph A Low pressure air supply and control system

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4567776A (en) * 1982-06-30 1986-02-04 Kubota Trane Ltd. Fluid flowmeter of Karman vortex detecting type
JPS608498A (ja) * 1983-06-27 1985-01-17 Mitsubishi Electric Corp 風量制御装置
DE4243519C2 (de) * 1992-12-22 1996-09-05 Radtke Wolfgang Dipl Ing Regulier- und Absperrklappe für eine Lüftungsanlage

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2896850A (en) * 1953-04-27 1959-07-28 Carrier Corp Air conditioning control system

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH233123A (de) * 1943-01-25 1944-07-15 Lufttechnische Ges Mbh Verfahren zur Regelung der Belüftung von Räumen.

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2896850A (en) * 1953-04-27 1959-07-28 Carrier Corp Air conditioning control system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4597723A (en) * 1982-06-07 1986-07-01 Sember Joseph A Low pressure air supply and control system

Also Published As

Publication number Publication date
GB1001560A (en) 1965-08-18
DE1222223B (de) 1966-08-04
NL124398C (ko) 1900-01-01
FR1398718A (fr) 1965-05-14

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