US3254830A - Apparatus for varying the air quantity in air distribution chambers - Google Patents

Apparatus for varying the air quantity in air distribution chambers Download PDF

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Publication number
US3254830A
US3254830A US353032A US35303264A US3254830A US 3254830 A US3254830 A US 3254830A US 353032 A US353032 A US 353032A US 35303264 A US35303264 A US 35303264A US 3254830 A US3254830 A US 3254830A
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Prior art keywords
dampers
fans
axes
fan
varying
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US353032A
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Wallin Sven Werner
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Svenska Flaktfabriken AB
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Svenska Flaktfabriken AB
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    • 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
    • F24F13/08—Air-flow control members, e.g. louvres, grilles, flaps or guide plates
    • F24F13/10—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers
    • F24F13/14—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers built up of tilting members, e.g. louvre
    • F24F13/1426—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers built up of tilting members, e.g. louvre characterised by actuating means
    • 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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F7/00—Ventilation
    • F24F7/007—Ventilation with forced flow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F7/00—Ventilation
    • F24F7/04—Ventilation with ducting systems, e.g. by double walls; with natural circulation
    • F24F7/06—Ventilation with ducting systems, e.g. by double walls; with natural circulation with forced air circulation, e.g. by fan positioning of a ventilator in or against a conduit
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F7/00—Ventilation
    • F24F7/04—Ventilation with ducting systems, e.g. by double walls; with natural circulation
    • F24F7/06—Ventilation with ducting systems, e.g. by double walls; with natural circulation with forced air circulation, e.g. by fan positioning of a ventilator in or against a conduit
    • F24F7/065—Ventilation with ducting systems, e.g. by double walls; with natural circulation with forced air circulation, e.g. by fan positioning of a ventilator in or against a conduit fan combined with single duct; mounting arrangements of a fan in a duct
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
    • F26B21/06—Controlling, e.g. regulating, parameters of gas supply
    • F26B21/12—Velocity of flow; Quantity of flow, e.g. by varying fan speed, by modifying cross flow area
    • 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
    • F24F13/08—Air-flow control members, e.g. louvres, grilles, flaps or guide plates
    • F24F13/10—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers
    • F24F13/14—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers built up of tilting members, e.g. louvre
    • F24F13/1426—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers built up of tilting members, e.g. louvre characterised by actuating means
    • F24F2013/1473—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers built up of tilting members, e.g. louvre characterised by actuating means with cams or levers

Definitions

  • the present invention relates to apparatus forvarying the quantity of gaseous medium in a medium distribution chamber for the supply and discharge of air or other gaseous medium.
  • a medium distribution chamber for the supply and discharge of air or other gaseous medium.
  • devices of this kind it is common practice to vary the air quantity by varying the speed of the fans used or by means of throttling the fans.
  • Devices for speed control are usually complicated, and the use of pressure regulators is an uneconomical solution in view of the great power consumed in such devices.
  • the non-return dampers may in a known manner he made as vertically oriented damper blades or flaps, the swinging centres of which are so displaced with respect to the vertical that a self-closing efiect is automatically obtained, when the fan associated therewith is switchedotf.
  • the damper blades or flaps are inter-connected by a coupling rod secured at different distances from the swinging centres of the blades or flaps in such a manner that when in their open position, a diifusor is formed.
  • these chambers are, according to a suitable embodiment of the invention, mutually interconnected by one or more connecting channels thus creating a common air distributing system in order to obtain increased flexibility in varying the air quantity.
  • FIG. 1 is a profile view of a distribution chamber having a pair of working fans, and a portion of which chamber is cutaway to better illustrate the mounting of the fans in the chamber;
  • FIG. 1a is a perspective view of a centrifugal fan constructed in accordance with the invention.
  • FIG. 2 is a perspective view of a plurality of co-operating distribution chambers.
  • a distribution chamber 1 is equipped with a plurality of fans, in the present instance two designated 2 and 3 comprising centrifugal fans having nonreturn dampers 4a, 4b as shown in FIG. 1a.
  • the nonreturn dampers are, according to the invention constructed as vertically oriented damper blades or flaps having swinging centers or axes 5 and 6, which centers are displaced with respect to the vertical plane so that a self-closing effect is automatically obtained when the fan in question is switched-off.
  • FIGS. 1 and 1a the swinging axes 5 and 6
  • a treatment plant 8 comprises four distribution chambers 1a, 1b, 1c and 1d located opposite to each other.
  • the distribution chambers are as shown in FIG.'2 mutually inter-connected by means of a number of connecting channels 9, which, together with the distribution chambers create a common air distributing system.
  • the fans connected to the distribution chambers may be displaced both vertically and horizontally.
  • the fans located opposite to each other on either side of the treatment plant are preferably interconnected to be switched-on or switched-01f at the same time.
  • cleaning doors are provided on the distribution chambers. During this cleaning, in order not to spoil the balance in the system, which balance is gained thanks to the invention, the cleaning doors located opposite to each other on either side of the treatment plant should preferably be inter-connected for simultaneous opening.
  • Apparatus for varying the quantity of gaseous medium supplied into a distribution chamber said distribution chamber including a plurality of fans operating in parallel, said fans adapted for connection and disconnection individually and each having at least a pair of substantially vertically oriented dampers mounted in the terminal open end of said fan, each of said dampers having vertically oriented swinging axes, said axes being offset whereby disconnection of at least one of said fans causes said dampers to substantially close ofi the outlet of said one fan automatically, thereby impeding reverse flow in said fan, said dampers being of a fiat configura tion and inter-connected by means of a coupling rod secured to said dampers at differing distances from said swing axes wherein said dampers in their open position define a flow path of increasing cross-sectional area from the swinging axes outwardly, thereby causing the flow of gaseous medium to expand as it traverses through the dampers.
  • Apparatus in accordance with claim 1 including a plurality of mutually inter-connected distribution chambers, each of said chambers connected to the other by means of connecting channels whereby a common air distribution system is obtained.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Ventilation (AREA)
  • Preliminary Treatment Of Fibers (AREA)
  • Duct Arrangements (AREA)
  • Air-Flow Control Members (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Description

June 7, 1966 s. w. WALLlN 3,254,830 APPARATUS FOR VARYING THE AIR QUANTITY IN AIR DISTRIBUTION CHAMBERS Filed March 18, 1964 INVENTORI BY SVEN WERNER WALLIN WW ATT Y S,
United States Patent 3,254,830 APPARATUS FOR VARYING THE AIR QUANTITY IN AIR DISTRIBUTION CHAMBERS Sven Werner Wallin, Taby, Sweden, assignor to Aktie- 'bolaget Svenska Flaktfabriken, Stockholm, Sweden Filed Mar. 18, 1964, Ser. No. 353,032
Claims priority, application Sweden, Mar. 19, 1963,
3,008/ 63 2 (Ilaims. (Cl. 230-44) The present invention relates to apparatus forvarying the quantity of gaseous medium in a medium distribution chamber for the supply and discharge of air or other gaseous medium. In devices of this kind it is common practice to vary the air quantity by varying the speed of the fans used or by means of throttling the fans. Devices for speed control are usually complicated, and the use of pressure regulators is an uneconomical solution in view of the great power consumed in such devices.
It is an object of the invention to solve the abovementioned problem by simplemeans, which means is characterized in that the air distribution chamber is equipped with several fans operating in parallel, which fans may be connected and disconnected individually, and each of which is provided with self-closing, non-return dampers.
The non-return dampers may in a known manner he made as vertically oriented damper blades or flaps, the swinging centres of which are so displaced with respect to the vertical that a self-closing efiect is automatically obtained, when the fan associated therewith is switchedotf. According to a suitable embodiment the damper blades or flaps are inter-connected by a coupling rod secured at different distances from the swinging centres of the blades or flaps in such a manner that when in their open position, a diifusor is formed. In plants with a number of co-operating distributing chambers, these chambers are, according to a suitable embodiment of the invention, mutually interconnected by one or more connecting channels thus creating a common air distributing system in order to obtain increased flexibility in varying the air quantity.
The invention will now be described in greater detail with reference to the accompanying drawing, wherein:
FIG. 1 is a profile view of a distribution chamber having a pair of working fans, and a portion of which chamber is cutaway to better illustrate the mounting of the fans in the chamber;
FIG. 1a is a perspective view of a centrifugal fan constructed in accordance with the invention; and
FIG. 2 is a perspective view of a plurality of co-operating distribution chambers.
In the drawing a distribution chamber 1 is equipped with a plurality of fans, in the present instance two designated 2 and 3 comprising centrifugal fans having nonreturn dampers 4a, 4b as shown in FIG. 1a. The nonreturn dampers are, according to the invention constructed as vertically oriented damper blades or flaps having swinging centers or axes 5 and 6, which centers are displaced with respect to the vertical plane so that a self-closing effect is automatically obtained when the fan in question is switched-off. To this end, and as illustrated in FIGS. 1 and 1a the swinging axes 5 and 6,
although substantially vertically oriented, are mounted in the terminal open end 12 of the fan casing 13 in such a manner that the lower portions of the axes are offset from the vertical. In the present instance oifsetting the axes 5 and 6 from the vertical is accomplished by connecting the fan casing to the interior of the chamber 1 at an angle to the horizontal. As illustrated in FIG. 1,
the fan is angularly positioned by a spacer 14, located at the lower portion of the casing 13, and between the interior of the chamber 1 and the terminal end 12 of the fan 2. A coupling rod 7 is secured at the damper blades or flaps at different distances from the swinging axes of the damper blades or flaps in such a manner that the damper blades or flaps 4a, 4b in their open position, form a diffuser. In a typical embodiment, a treatment plant 8 comprises four distribution chambers 1a, 1b, 1c and 1d located opposite to each other. The distribution chambers are as shown in FIG.'2 mutually inter-connected by means of a number of connecting channels 9, which, together with the distribution chambers create a common air distributing system. As illustrated the fans connected to the distribution chambers may be displaced both vertically and horizontally. The fans located opposite to each other on either side of the treatment plant are preferably interconnected to be switched-on or switched-01f at the same time. In order to make it possible to clean the treatment plants easily, cleaning doors are provided on the distribution chambers. During this cleaning, in order not to spoil the balance in the system, which balance is gained thanks to the invention, the cleaning doors located opposite to each other on either side of the treatment plant should preferably be inter-connected for simultaneous opening.
Although the invention has been described with a certain degree of particularity, it is understood that the present disclosure has been made only by way of example and that numerous changes in the details of construction and the combination and arrangement of parts may be made without departing from the spirit and the scope of the invention as hereinafter claimed.
What is claimed is:
1. Apparatus for varying the quantity of gaseous medium supplied into a distribution chamber, said distribution chamber including a plurality of fans operating in parallel, said fans adapted for connection and disconnection individually and each having at least a pair of substantially vertically oriented dampers mounted in the terminal open end of said fan, each of said dampers having vertically oriented swinging axes, said axes being offset whereby disconnection of at least one of said fans causes said dampers to substantially close ofi the outlet of said one fan automatically, thereby impeding reverse flow in said fan, said dampers being of a fiat configura tion and inter-connected by means of a coupling rod secured to said dampers at differing distances from said swing axes wherein said dampers in their open position define a flow path of increasing cross-sectional area from the swinging axes outwardly, thereby causing the flow of gaseous medium to expand as it traverses through the dampers.
2. Apparatus in accordance with claim 1 including a plurality of mutually inter-connected distribution chambers, each of said chambers connected to the other by means of connecting channels whereby a common air distribution system is obtained.
References Cited by the Examiner UNITED STATES PATENTS 1,946,300 2/ 1934 Vercruyssen 230-114 2,030,993 2/ 1936 Langenkamp et a1. 230-114 2,279,425 4/ 1942 Voysey f 230-114 2,673,512 3/1954 Henney 98-10 2,682,951 7/1954 Hamburg 230-114 MARK NEWMAN, Primary Examiner. W. I. KRAUSS, Assistant Examiner.

Claims (1)

1. APPARATUS FOR VARYING THE QUANTITY OF GASEOUS MEDIUM SUPPLIED INTO A DISTRIBUTION CHAMBER, SAID DISTRIBUTION CHAMBER INCLUDING A PLURALITY OF FANS OPERATING IN PARALLEL, SAID FANS ADAPTED FOR CONNECTION AND DISCONNECTION INDIVIDUALLY AND EACH HAVING AT LEAST A PAIR OF SUBSTANTIALLY VERTICALLY ORIENTED DAMPERS MOUNTED IN THE TERMINAL OPEN END OF SAID FAN, EACH OF SAID DAMPERS HAVING VERTICALLY ORIENTED SWINGING AXES, SAID AXES BEING OFFSET WHEREBY DISCONNECTION OF AT LEAST ONE OF SAID FANS CAUSES SAID DAMPSERS TO SUBSTANTIALLY CLOSE OFF THE OUTLET OF SAID ONE FAN AUTOMATICALLY, THEREBY IMPEDING REVERSE FLOW IN SAID FAN, SAID DAMPERS BEING OF A FLAP CONFIGURATION AND INTER-CONNECTED BY MEANS OF A COUPLING ROD SECURED TO SAID DAMPERS AT DIFFERING DISTANCES FROM SAID SWING AXES WHEREIN SAID DAMPERS IN THEIR OPEN POSITION DEFINE A FLOW PATH OF INCREASING CROSS-SECTIONAL AREA FROM THE SWINGING AXES OUTWARDLY, THEREBY CAUSING THE FLOW OF GASEOUS MEDIUM TO EXPAND AS IT TRAVERSES THROUGH THE DAMPERS.
US353032A 1963-03-19 1964-03-18 Apparatus for varying the air quantity in air distribution chambers Expired - Lifetime US3254830A (en)

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AT (1) AT250634B (en)
BE (1) BE645431A (en)
CH (1) CH411287A (en)
ES (1) ES297781A1 (en)
FI (1) FI47016C (en)
FR (1) FR1385973A (en)
GB (1) GB995962A (en)
NL (1) NL6402869A (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3398880A (en) * 1965-12-31 1968-08-27 Svenska Flaektfabriken Ab Centrifugal fan
US20060171803A1 (en) * 2005-01-28 2006-08-03 Japan Servo Co., Ltd. Centrifugal fan
US20080187433A1 (en) * 2003-03-20 2008-08-07 Hopkins Lawrence G Fan array fan section in air-handling systems
US8072756B1 (en) * 2010-05-28 2011-12-06 Rockwell Automation Technologies, Inc. Air cooling of medium voltage drive components
US8398365B2 (en) 2003-03-20 2013-03-19 Huntair, Inc. Modular fan units with sound attenuation layers for an air handling system
US20150159673A1 (en) * 2013-12-10 2015-06-11 Hon Hai Precision Industry Co., Ltd. Fan assembly
US20150167691A1 (en) * 2013-12-12 2015-06-18 Hon Hai Precision Industry Co., Ltd. Fan assembly
US11255332B2 (en) 2003-03-20 2022-02-22 Nortek Air Solutions, Llc Modular fan housing with multiple modular units having sound attenuation for a fan array for an air-handling system

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3699873A (en) * 1971-06-14 1972-10-24 Philco Ford Corp Air flow control apparatus
NL9000718A (en) * 1990-03-27 1991-10-16 Navep Bv CLIMATING DEVICE, ESPECIALLY SUITABLE FOR THE PROCESSING OF MEAT PARTS.
US5167252A (en) * 1991-01-29 1992-12-01 W. R. Grace & Co. Conn. High temperature control damper with sealing flange
US10518205B2 (en) 2016-02-26 2019-12-31 Lg Electronics Inc. Air cleaner
CN111156622B (en) 2016-02-26 2022-04-26 Lg电子株式会社 Air cleaner
CN111765554B (en) 2016-02-26 2022-02-25 Lg电子株式会社 Air cleaner
US20170246577A1 (en) 2016-02-26 2017-08-31 Lg Electronics Inc. Air cleaner
US10436469B2 (en) 2016-02-26 2019-10-08 Lg Electronics Inc. Air cleaner
EP3211337B1 (en) 2016-02-26 2020-09-23 LG Electronics Inc. Air cleaner
US9950289B2 (en) 2016-02-26 2018-04-24 Lg Electronics Inc. Air cleaner
US10508658B2 (en) * 2016-02-26 2019-12-17 Lg Electronics Inc. Air cleaner

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1946300A (en) * 1931-07-06 1934-02-06 Vercruyssen August Automatic draft and combustion control
US2030993A (en) * 1934-08-27 1936-02-18 Internat Engineering Inc Fan
US2279425A (en) * 1939-11-16 1942-04-14 Westinghouse Electric & Mfg Co Discharge shutter for blowers
US2673512A (en) * 1948-09-17 1954-03-30 Gen Motors Corp Air conditioning apparatus
US2682951A (en) * 1952-11-24 1954-07-06 Hamburg Samuel Fan for combine separators

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1946300A (en) * 1931-07-06 1934-02-06 Vercruyssen August Automatic draft and combustion control
US2030993A (en) * 1934-08-27 1936-02-18 Internat Engineering Inc Fan
US2279425A (en) * 1939-11-16 1942-04-14 Westinghouse Electric & Mfg Co Discharge shutter for blowers
US2673512A (en) * 1948-09-17 1954-03-30 Gen Motors Corp Air conditioning apparatus
US2682951A (en) * 1952-11-24 1954-07-06 Hamburg Samuel Fan for combine separators

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3398880A (en) * 1965-12-31 1968-08-27 Svenska Flaektfabriken Ab Centrifugal fan
US8556574B2 (en) 2003-03-20 2013-10-15 Huntair, Inc. Fan array fan section in air-handling systems
US20110212679A1 (en) * 2003-03-20 2011-09-01 Huntair, Inc. Fan array fan section in air-handling systems
US8562283B2 (en) * 2003-03-20 2013-10-22 Huntair, Inc. Fan array fan section in air-handling systems
US8727700B2 (en) 2003-03-20 2014-05-20 Huntair, Inc. Fan array fan section in air-handling systems
US8694175B2 (en) 2003-03-20 2014-04-08 Huntair, Inc. Fan array fan section in air-handling systems
US11255332B2 (en) 2003-03-20 2022-02-22 Nortek Air Solutions, Llc Modular fan housing with multiple modular units having sound attenuation for a fan array for an air-handling system
US8398365B2 (en) 2003-03-20 2013-03-19 Huntair, Inc. Modular fan units with sound attenuation layers for an air handling system
US8414251B2 (en) 2003-03-20 2013-04-09 Huntair, Inc. Modular fan housing with multiple modular units having sound attenuation for a fan array for an air-handling system
US8419348B2 (en) 2003-03-20 2013-04-16 Huntair, Inc. Fan array fan section in air-handling systems
US10641271B2 (en) 2003-03-20 2020-05-05 Nortek Air Solutions, Llc Fan array fan section in air-handling systems
US20080187433A1 (en) * 2003-03-20 2008-08-07 Hopkins Lawrence G Fan array fan section in air-handling systems
US10495094B2 (en) 2003-03-20 2019-12-03 Nortek Air Solutions, Llc Modular fan housing with multiple modular units having sound attenuation for a fan array for an air-handling system
US7922442B2 (en) 2003-03-20 2011-04-12 Huntair, Inc. Fan array fan section in air-handling systems
US8734086B2 (en) 2003-03-20 2014-05-27 Huntair, Inc. Modular fan housing with multiple modular units having sound attenuation for a fan array for an air-handling system
US8727701B2 (en) 2004-03-19 2014-05-20 Huntair, Inc. Modular fan housing with multiple modular units having sound attenuation for a fan array for an air-handling system
US7329089B2 (en) * 2005-01-28 2008-02-12 Japan Servo Co., Ltd. Centrifugal fan
US20060171803A1 (en) * 2005-01-28 2006-08-03 Japan Servo Co., Ltd. Centrifugal fan
US8897009B2 (en) 2010-05-28 2014-11-25 Rockwell Automation Technologies, Inc. Air cooling of medium voltage drive components
US8072756B1 (en) * 2010-05-28 2011-12-06 Rockwell Automation Technologies, Inc. Air cooling of medium voltage drive components
US20150159673A1 (en) * 2013-12-10 2015-06-11 Hon Hai Precision Industry Co., Ltd. Fan assembly
US20150167691A1 (en) * 2013-12-12 2015-06-18 Hon Hai Precision Industry Co., Ltd. Fan assembly

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Publication number Publication date
ES297781A1 (en) 1964-09-01
AT250634B (en) 1966-11-25
FR1385973A (en) 1965-01-15
FI47016C (en) 1973-08-10
GB995962A (en) 1965-06-23
FI47016B (en) 1973-05-02
CH411287A (en) 1966-04-15
NL6402869A (en) 1964-09-21
BE645431A (en) 1964-07-16

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