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US20090220334A1 - Fan shroud for heat exchange tower fans - Google Patents

Fan shroud for heat exchange tower fans Download PDF

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Publication number
US20090220334A1
US20090220334A1 US12/039,501 US3950108A US2009220334A1 US 20090220334 A1 US20090220334 A1 US 20090220334A1 US 3950108 A US3950108 A US 3950108A US 2009220334 A1 US2009220334 A1 US 2009220334A1
Authority
US
United States
Prior art keywords
fan
heat exchange
exchange tower
sound absorbing
outer ring
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.)
Abandoned
Application number
US12/039,501
Other languages
English (en)
Inventor
Michel Vouche
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.)
SPX Cooling Technologies Inc
Original Assignee
SPX Cooling Technologies Inc
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 SPX Cooling Technologies Inc filed Critical SPX Cooling Technologies Inc
Priority to US12/039,501 priority Critical patent/US20090220334A1/en
Assigned to SPX COOLING TECHNOLOGIES, INC. reassignment SPX COOLING TECHNOLOGIES, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: VOUCHE, MICHEL
Priority to EP09715025.4A priority patent/EP2255073B1/en
Priority to TR2019/02448T priority patent/TR201902448T4/tr
Priority to ES09715025T priority patent/ES2712718T3/es
Priority to JP2010548783A priority patent/JP2011513688A/ja
Priority to PCT/US2009/033403 priority patent/WO2009108477A1/en
Priority to TW098105316A priority patent/TWI553285B/zh
Publication of US20090220334A1 publication Critical patent/US20090220334A1/en
Abandoned legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/52—Casings; Connections of working fluid for axial pumps
    • F04D29/522—Casings; Connections of working fluid for axial pumps especially adapted for elastic fluid pumps
    • F04D29/526—Details of the casing section radially opposing blade tips
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
    • F04D29/663—Sound attenuation
    • F04D29/664—Sound attenuation by means of sound absorbing material

Definitions

  • the invention relates to the field of heat exchange towers, and more particularly relates to the field of fans used to move air through heat exchange towers, including industrial cooling towers, industrial heating towers, and air cooled steam condensers.
  • heat exchange towers are known in the industry. These heat exchange towers include, for example, so-called industrial cooling towers, which are used to cool warm water by industrial or other processes. These cooling towers typically have a liquid that is sprayed from a top inside the tower, and falls over a media such as, for example, splash bars or a pack of spaced apart thin film sheets. Air is typically drawn through the tower, either sideways across the tower, upwardly through the tower, or a combination thereof, and interacts with the falling liquid. The falling liquid is warmer than the ambient air, and thus is cooled by this process and falls into a collection basin at the bottom of the tower.
  • Another type of heat exchange tower is a heating tower which may be used, for example, for the vaporization of liquefied natural gas.
  • ACC air cooled condenser
  • Such a tower is typically a large box-like structure having an open lower or side frame.
  • the open frame may be closed off on some of its sides.
  • the frame supports a deck having a series of fans which blow air upward so that the air is drawn in through the open sides of the tower and is forced upward by the fans.
  • Above the fans the tower supports a series of condenser coils.
  • a plurality of steam supply header tubes run lengthwise on the top of the tower and dispense steam downward into angled downwardly extending condenser coils. Water is heated in a boiler to create steam, which is then sent to a high pressure end of a turbine to create work (via change in energy of the steam).
  • the steam at the low pressure end of the turbine then is condensed by the condenser to create a vacuum that pulls the steam through the turbine.
  • a series of collection header tubes which receives condensed fluid and exits it from the tower.
  • the entirety of the condenser coils is usually located above the fans. Air is exhausted out the open top of the tower past the steam supply header tubes.
  • a deck of the fans is added below the coils to provide a greater volume of air flow.
  • the deck typically has a number of fans spaced in a grid-like arrangement, each surrounded by a fan shroud. Other terms for fan shroud are fan inlet bell or fan casing.
  • An example of a different ACC tower is described in U.S. Patent Publication No. 2006/0243430.
  • a heat exchange tower comprises at least one fan having fan blades with outer tips rotating in a circle of rotation, and a fan shroud, the fan shroud comprising an outer ring structure, and a sound absorbing material mounted to the outer ring surface and disposed radially inside the outer ring structure and outside of the circle of rotation of the tips of the fan blades.
  • a heat exchange tower also comprises at least one fan having fan blades with outer tips rotating in a circle of rotation, and a fan shroud, the fan shroud which has an outer supporting means and a sound absorbing means mounted to the outer supporting means disposed radially inside the outer supporting means and outside of the circle of rotation of the tips of the fan blades.
  • a heat exchange tower has at least one fan having fan blades with outer tips rotating in a circle of rotation and a fan shroud, the fan shroud comprising an outer ring structure formed of at least one molded section, the section forming at least one pocket and a sound absorbing material disposed inside the pocket and radially outside of the circle of rotation of the tips of the fan blades.
  • Another aspect provides a method for reducing sound emitted by a heat exchange tower, the tower having at least one fan blade with outer tips rotating in a circle of rotation, and a fan shroud surrounding the circle of rotation of the tips, comprising the step of providing a sound absorbing material on an inner surface of the shroud between the inner surface of the shroud and the circle of rotation of the blade tips.
  • Still another aspect provides an air cooled condenser which has a plurality of condenser coils, a fan deck disposed below the condenser coils, the fan deck comprising a plurality of fans having fan blades with outer tips rotating in a circle of rotation, and a plurality of fan shrouds each surrounding a respective fan, each fan shroud comprising an outer ring structure; and a sound absorbing material mounted to the outer ring surface and disposed radially inside the outer ring structure and outside of the circle of rotation of the tips of the fan blades.
  • FIG. 1 is a schematic perspective view of an air cooled condenser having a fan deck with a plurality of fan shrouds.
  • FIG. 2 is a bottom view of a fan surrounded by a fan shroud.
  • FIG. 3 is a sectional view of a fan and a fan shroud taken through line 3 - 3 in FIG. 2 , according to the first preferred embodiment of the invention.
  • FIG. 4 is a detailed view of a fan shroud taken through the detail circle of FIG. 3 .
  • FIG. 5 is a slightly cutaway perspective view of the fan shroud.
  • FIG. 6 is a cutaway perspective view of the fan shroud shown in FIG. 5 .
  • FIG. 7 is a somewhat exploded view of a fan shroud according to a second preferred embodiment of the invention.
  • FIG. 8 is a cutaway detail view of the fan shroud of FIG. 7 .
  • Some embodiments of the present invention provide a fan shroud for heat exchange tower fans, including a noise reducing material that can reduce fan noise coming from the heat exchange tower.
  • the fan shroud includes an outer ring structure and the sound absorbing material is disposed inside the outer ring structure and outside the circle of rotation of the tips of the fan blades.
  • FIG. 1 an air cooled condensing (ACC) tower 10 is shown.
  • the tower includes a base 12 which rests on the ground and lower framework 14 which supports a fan deck 16 .
  • the lower framework 14 is shown simply as being legs at the corner of the tower.
  • frame 14 is typically an internal lattice framework having columns and girts interconnected with each other to form an open frame. All four sides of the frame may be left open below the fan deck 16 , or in some instances two of the opposed sides may each have a closed wall. Examples of an ACC illustrated herein will be described in the context of having the two end walls labeled 18 and 19 as being closed and the two sides labeled 20 and 21 as being open. However, it will be appreciated may have any number of open or closed sides beneath the fan deck 16 .
  • the fan deck 16 is a support structure which typically supports a plurality of individual fans 24 (blades not shown in FIG. 1 for clarity of illustration), each having their own fan shroud 26 associated therewith.
  • the fan shrouds 26 are discussed in further detail below.
  • the fans 24 blow air upward past a series of angled condenser tube coil structures 28 .
  • the coils 28 are elongated coils generally forming a planar sheet-like structure which air can pass through.
  • the coils 28 receive steam from a plurality of steam supply headers 30 .
  • the steam supply headers lead into the coils 28 and steam/water falls downward vertically through the coils 28 and is cooled by heat exchange with the ambient air outside the coils 28 .
  • the steam condenses into water which is collected in lower water collection headers 32 and discharged from the tower.
  • An upper frame structure 40 is typically provided to provide overall structural support to the area having the supply headers 30 , condenser coils 28 , and water headers 32 .
  • the coil and header pieces build into an upper superstructure.
  • the frame structure 40 is simply framing for the casing.
  • the casing may extend to approximately the bottom of the steam header or may extend some modest distance above the steam header.
  • This upper frame 40 typically will have all four sides closed by solid or generally non-porous side walls or coverings 42 on all four sides. It will be appreciated that in FIG. 1 many solid items such as the side walls are shown being transparent so that an inner view of the tower 10 can be provided.
  • FIGS. 2-6 show a first preferred embodiment of the present invention.
  • the fan shroud 26 includes an eased or flared, inwardly tapered inlet section 102 , as well as a noise absorbing section 104 , which is disposed at the axial position of the fans, and surrounds the fan tips as they rotate.
  • the noise absorbing section 104 is adapted to reduce sound coming from the fan tips in particular, and the fan in general.
  • the eased or flared inlet section 102 may be of a relatively conventional construction and can be, for example, made of segments of molded fiberglass material, or may be in sections or a continuous piece of rolled steel.
  • the noise absorbing section 104 includes as some portion thereof a sound absorbing material 114 .
  • Sound absorbing materials may comprise any known or future discovered sound absorbing material, such as, for example, fiberglass batting or foam. Also, the sound absorbing material may comprise an irregular shaped surface material.
  • acoustical foam such as that made by SONEX®, or open and closed all flexible polyurethane, polyimide, melamine and other absorption foams, or flexible external viscoelastic and constrained layer products available from SOUNDCOAT®.
  • Simple fiberglass batting such as used for insulation is also suitable.
  • locally active materials may be employed.
  • Combinations of different sound absorbing materials may also be used. Further, the sound absorbing material may span entirely around the circumference of the noise absorbing portion 104 , may span across arcuate portions of the noise absorbing portion 104 , and may span either part of the entire height of the noise absorbing portion 104 .
  • the noise absorbing portion 104 is referred to herein for convenience as having a straight side, it may of course also have either or both of its inner and outer surfaces being a somewhat convex, or somewhat concave shape, or may have an undulating shape. Further, the noise absorbing portion 104 may simply be a truncated cone flaring in either the upwards or downwards direction, or a combination of outward and upward flaring cones.
  • the noise absorbing section 104 is illustrated as further having an outer ring 106 , which has a straight C-shaped cross section and may be formed by a rolled steel cylinder having a straight sided outer wall 108 and top and bottom walls 110 and 112 .
  • the arrangement also features a thickness of sound absorbing material 114 , which in one preferred embodiment may be fiberglass batting.
  • the sound absorbing material 114 may be other materials such as foam or a material having a complex reflective or absorbing surface finish. Also, combinations of various sound absorbing materials may be used to make up the sound absorbing material 114 .
  • an inner screen 120 is provided inside of the location of the sound absorbing material 114 .
  • the screen 120 is at least somewhat permeable to sound so that the sound will be absorbed by the sound absorbing material 114 , and further can provide structural support to retain the sound absorbing material 114 in place.
  • a steel screen is used having 20 to 50 per cent open area. Examples of suitable screens include metal or plastic plate perforated with holes or slots, or metal or plastic mesh.
  • the screen 120 serves the function of retaining the sound absorbing material 114 in its place, so that it does not tend to shred or come apart.
  • the screen 120 also reduces the moisture that will enter the sound absorbing material 114 in the case of, for example, rain falling into the fan shroud. Additionally, a water resistant membrane may be placed between screen 120 and sound absorbing material 114 .
  • a water resistant membrane example is Gore-Tex® material.
  • the overall fan shroud 26 including the sound absorbing material features, is supported from above by a fan deck 16 by using conventional support arrangement.
  • FIG. 6 shows the outer ring 106 in combination with the screen 120 forming a hollow pocket 122 .
  • the sound-absorbing material 114 is not shown.
  • FIG. 6 also shows that the outer ring 106 can be made of a number of rolled boxed curved steel segments, which can be joined by virtue of flanges 124 that accept bolts into neighboring flanges of the neighboring arcuate sections.
  • FIG. 6 also illustrates a flange 126 provided along the bottom of the ring 106 , which can facilitate joining with the flared inlet portion 102 .
  • FIGS. 7 and 8 illustrate a second embodiment which utilizes the principles of the first embodiment described above, but adds some variations and additional features.
  • a flared inlet section 202 is integral with the outer ring of the noise absorbing section 204 .
  • an entire shroud is formed by a plurality of arcuate sections with each section having a lower flared portion 204 and an upper outer ring of a sound absorbing portion 204 .
  • the entire shroud is made of a plurality of arcuate sections.
  • each arcuate section has been molded from fiberglass material.
  • Joining flanges 224 are provided, and can be bolted to each other.
  • intermediate steel plates re-enforcements may be bolted to be sandwiched in between the neighboring flanges 224 .
  • each section forms part of the sound absorbing portion 204 and has one or more pockets 222 that are molded directly into the structure.
  • two elongated pockets 222 are molded one above the other. This provides an intermediate rib structure 223 between the pockets 222 which can enhance the stiffness of the sections.
  • a screen 220 is provided forming part of the inner surface of the fan shroud. Disposed between the screen 220 and the pockets 222 are sound absorbing material 214 . As illustrated in FIG. 7 , the sound absorbing material 214 includes segments of fiberglass batting 208 . The fiberglass batting 208 tends to absorb sound. Although fiberglass batting is discussed with respect to the second embodiment, any other sound absorbing material or a combination of materials may be employed. In the embodiment of FIGS. 7 and 8 , the screen may be attached by screws 232 screwed into the ring structure 204 .

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Other Air-Conditioning Systems (AREA)
US12/039,501 2008-02-28 2008-02-28 Fan shroud for heat exchange tower fans Abandoned US20090220334A1 (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
US12/039,501 US20090220334A1 (en) 2008-02-28 2008-02-28 Fan shroud for heat exchange tower fans
EP09715025.4A EP2255073B1 (en) 2008-02-28 2009-02-06 Fan shroud for heat exchange tower fans
TR2019/02448T TR201902448T4 (tr) 2008-02-28 2009-02-06 Isi değişim kulesi fanlari için fan mahfazasi.
ES09715025T ES2712718T3 (es) 2008-02-28 2009-02-06 Carcasa de ventilador para ventiladores de torre de intercambio de calor
JP2010548783A JP2011513688A (ja) 2008-02-28 2009-02-06 熱交換タワー用ファンシュラウド
PCT/US2009/033403 WO2009108477A1 (en) 2008-02-28 2009-02-06 Fan shroud for heat exchange tower fans
TW098105316A TWI553285B (zh) 2008-02-28 2009-02-19 熱交換塔風扇的風扇罩

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US12/039,501 US20090220334A1 (en) 2008-02-28 2008-02-28 Fan shroud for heat exchange tower fans

Publications (1)

Publication Number Publication Date
US20090220334A1 true US20090220334A1 (en) 2009-09-03

Family

ID=41013310

Family Applications (1)

Application Number Title Priority Date Filing Date
US12/039,501 Abandoned US20090220334A1 (en) 2008-02-28 2008-02-28 Fan shroud for heat exchange tower fans

Country Status (7)

Country Link
US (1) US20090220334A1 (zh)
EP (1) EP2255073B1 (zh)
JP (1) JP2011513688A (zh)
ES (1) ES2712718T3 (zh)
TR (1) TR201902448T4 (zh)
TW (1) TWI553285B (zh)
WO (1) WO2009108477A1 (zh)

Cited By (17)

* Cited by examiner, † Cited by third party
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US20140251589A1 (en) * 2013-03-07 2014-09-11 Spx Cooling Technologies, Inc Air cooled condenser apparatus and method
USD736261S1 (en) * 2012-11-29 2015-08-11 Cummins Inc. Shroud
US20150330709A1 (en) * 2012-05-23 2015-11-19 Spx Cooling Technologies, Inc. Modular air cooled condenser apparatus and method
US20150345509A1 (en) * 2012-10-08 2015-12-03 Ebm-Papst Mulfingen Gmbh & Co. Kg Wall ring with wall ring heating element for axial fans
USD805107S1 (en) * 2016-12-02 2017-12-12 U.S. Farathane Corporation Engine fan shroud
EP3355024A1 (en) 2017-01-30 2018-08-01 SPX Dry Cooling Belgium sprl Air-cooled condenser with air-flow diffuser
US20190072333A1 (en) * 2017-09-01 2019-03-07 The Babcock & Wilcox Company Air cooled condenser (acc) wind mitigation system
CN112378128A (zh) * 2020-11-11 2021-02-19 泉州市致运制冷设备有限公司 一种降噪减震压缩冷凝机组
US11150036B2 (en) * 2016-08-24 2021-10-19 Spg Dry Cooling Belgium Induced draft air-cooled condenser
US11333444B2 (en) * 2013-10-31 2022-05-17 Delta Electronics, Inc. Heat-exchange apparatus
US11486646B2 (en) 2016-05-25 2022-11-01 Spg Dry Cooling Belgium Air-cooled condenser apparatus and method
US11604030B2 (en) 2017-09-27 2023-03-14 Holtec International Air-cooled condenser system
EP4177478A1 (en) * 2021-11-03 2023-05-10 Talleres Zitrón, S.A. Axial fan with an integrated silencer
CN116134227A (zh) * 2020-08-04 2023-05-16 益美特公司 冷却塔风扇筒
US11747041B2 (en) * 2019-01-31 2023-09-05 Johnson Controls Tyco IP Holdings LLP HVAC fan housing systems and methods
US11796255B2 (en) 2017-02-24 2023-10-24 Holtec International Air-cooled condenser with deflection limiter beams
US11913470B2 (en) 2017-10-05 2024-02-27 Japan Aerospace Exploration Agency Ducted fan, multicopter, vertical take-off and landing aircraft, CPU-cooling fan, and radiator-cooling fan

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US11097828B2 (en) * 2017-07-24 2021-08-24 Dotterel Technologies Limited Shroud
EP3862266B1 (en) * 2018-10-04 2022-11-02 Honda Motor Co., Ltd. Ducted fan device
DE102019119626A1 (de) * 2019-07-19 2021-01-21 Ebm-Papst Mulfingen Gmbh & Co. Kg Gehäusering eines Axialventilators
CN212899157U (zh) 2020-07-27 2021-04-06 开利公司 用于风机出口侧的降噪装置以及包括其的热交换系统

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US20190339010A1 (en) * 2012-05-23 2019-11-07 Spg Dry Cooling Usa Llc Modular air cooled condenser apparatus and method
US20150330709A1 (en) * 2012-05-23 2015-11-19 Spx Cooling Technologies, Inc. Modular air cooled condenser apparatus and method
US11112180B2 (en) * 2012-05-23 2021-09-07 Spg Dry Cooling Usa Llc Modular air cooled condenser apparatus and method
US11662146B2 (en) * 2012-05-23 2023-05-30 Spg Dry Cooling Usa Llc Modular air cooled condenser apparatus and method
US10551126B2 (en) * 2012-05-23 2020-02-04 Spg Dry Cooling Usa Llc Modular air cooled condenser apparatus and method
US10527354B2 (en) * 2012-05-23 2020-01-07 Spg Dry Cooling Usa Llc Modular air cooled condenser apparatus and method
US20220163262A1 (en) * 2012-05-23 2022-05-26 Spg Dry Cooling Usa Llc Modular air cooled condenser apparatus and method
US20190086151A1 (en) * 2012-05-23 2019-03-21 Spx Dry Cooling Usa Llc Modular air cooled condenser apparatus and method
US20150345509A1 (en) * 2012-10-08 2015-12-03 Ebm-Papst Mulfingen Gmbh & Co. Kg Wall ring with wall ring heating element for axial fans
US9970458B2 (en) * 2012-10-08 2018-05-15 Ebm-Papst Mulfingen Gmbh & Co. Kg Wall ring with wall ring heating element for axial fans
USD736261S1 (en) * 2012-11-29 2015-08-11 Cummins Inc. Shroud
US9354002B2 (en) * 2013-03-07 2016-05-31 Spx Cooling Technologies, Inc. Air cooled condenser apparatus and method
US20140251589A1 (en) * 2013-03-07 2014-09-11 Spx Cooling Technologies, Inc Air cooled condenser apparatus and method
US11333444B2 (en) * 2013-10-31 2022-05-17 Delta Electronics, Inc. Heat-exchange apparatus
US11486646B2 (en) 2016-05-25 2022-11-01 Spg Dry Cooling Belgium Air-cooled condenser apparatus and method
US11150036B2 (en) * 2016-08-24 2021-10-19 Spg Dry Cooling Belgium Induced draft air-cooled condenser
USD805107S1 (en) * 2016-12-02 2017-12-12 U.S. Farathane Corporation Engine fan shroud
WO2018138147A1 (en) 2017-01-30 2018-08-02 Spx Dry Cooling Belgium Air-cooled condenser with air-flow diffuser
EP3355024A1 (en) 2017-01-30 2018-08-01 SPX Dry Cooling Belgium sprl Air-cooled condenser with air-flow diffuser
US11796255B2 (en) 2017-02-24 2023-10-24 Holtec International Air-cooled condenser with deflection limiter beams
US11067338B2 (en) * 2017-09-01 2021-07-20 The Babcock & Wilcox Company Air cooled condenser (ACC) wind mitigation system
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EP2255073B1 (en) 2018-11-28
TW200946859A (en) 2009-11-16
ES2712718T3 (es) 2019-05-14
EP2255073A4 (en) 2015-04-15
TR201902448T4 (tr) 2019-03-21
WO2009108477A1 (en) 2009-09-03
JP2011513688A (ja) 2011-04-28
EP2255073A1 (en) 2010-12-01
TWI553285B (zh) 2016-10-11

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