EP3009682B1 - Ventilateur axial avec diffuseur interne et externe - Google Patents

Ventilateur axial avec diffuseur interne et externe Download PDF

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Publication number
EP3009682B1
EP3009682B1 EP15189055.5A EP15189055A EP3009682B1 EP 3009682 B1 EP3009682 B1 EP 3009682B1 EP 15189055 A EP15189055 A EP 15189055A EP 3009682 B1 EP3009682 B1 EP 3009682B1
Authority
EP
European Patent Office
Prior art keywords
diffuser
fan
axial
drive motor
supporting
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.)
Active
Application number
EP15189055.5A
Other languages
German (de)
English (en)
Other versions
EP3009682A1 (fr
Inventor
Frank Dipl.-Ing. Müller
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.)
Thermofin GmbH
Original Assignee
Thermofin GmbH
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 Thermofin GmbH filed Critical Thermofin GmbH
Publication of EP3009682A1 publication Critical patent/EP3009682A1/fr
Application granted granted Critical
Publication of EP3009682B1 publication Critical patent/EP3009682B1/fr
Active 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
    • F04D19/00—Axial-flow pumps
    • F04D19/002—Axial flow fans
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D25/00—Pumping installations or systems
    • F04D25/02—Units comprising pumps and their driving means
    • F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
    • 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
    • F04D29/54—Fluid-guiding means, e.g. diffusers
    • F04D29/541—Specially adapted for elastic fluid pumps
    • F04D29/542—Bladed diffusers
    • 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
    • F04D29/54—Fluid-guiding means, e.g. diffusers
    • F04D29/541—Specially adapted for elastic fluid pumps
    • F04D29/545—Ducts
    • 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
    • F04D29/70—Suction grids; Strainers; Dust separation; Cleaning
    • F04D29/701—Suction grids; Strainers; Dust separation; Cleaning especially adapted for elastic fluid pumps
    • F04D29/703—Suction grids; Strainers; Dust separation; Cleaning especially adapted for elastic fluid pumps specially for fans, e.g. fan guards
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2230/00—Manufacture
    • F05D2230/50—Building or constructing in particular ways
    • F05D2230/54—Building or constructing in particular ways by sheet metal manufacturing

Definitions

  • the invention relates to an axial fan equipped with an external and internal diffuser.
  • Axial fans are flow machines whose impeller axis of rotation runs parallel or axially to the air flow. According to the state of the art, axial fans are combined with diffusers to improve efficiency and are used for a wide range of tasks. Areas of application for axial fans are generally the combination of fans for air in connection with heat exchangers. For example, axial fans are used to operate recoolers, condensers, evaporators or as air coolers.
  • a diffuser is understood to mean a component which, for example, slows down gas flows and thus increases the gas pressure. Diffusers are used to convert kinetic energy into pressure energy, which requires the flow to be decelerated.
  • a gas turbine gas exhaust diffuser which includes stationary baffles located near the corners of a square Cross section of the diffuser are arranged.
  • the DE 20 2010 016 820 U1 discloses a diffuser for a fan and a fan assembly with such a diffuser.
  • a special feature is that the cross section of the outer diffuser along the main direction of flow changes from a circular cross section at the inlet opening to a non-circular cross section at the outlet opening.
  • an axial fan which has a fan nozzle made of sheet metal with an external diffuser. Furthermore, the components inside act as a cylindrical internal diffuser over a larger axial area.
  • the EP 0 708 249 A1 discloses an axial fan, the fan nozzle of which expands counter to the direction of flow in the entry area of the flow by a connecting piece, the nozzle and the connecting piece being made of sheet metal.
  • JP H03 11114 A describes a fan device mounted on a heat exchanger.
  • EP 2 418 388 A2 describes a fan, in particular for use in air conditioning and refrigeration technology, made of a one-piece plastic housing.
  • the object of the invention is now to provide an axial fan with an outer diffuser and an inner diffuser that consists entirely of temperature-resistant and mechanically resilient materials.
  • the fan nozzle and the external diffuser are made of sheet metal and are made in one piece. The part is first deep drawn and then rolled.
  • Sheet metal in the sense of the invention is understood to be a product made of metal, with galvanized sheet steel in particular being used to manufacture the components mentioned.
  • the support unit is made up of support arms, a cylindrical tube as an internal diffuser and a support ring.
  • the drive motor is fastened to the support ring and is at least partially accommodated by the inner diffuser, which makes a particularly length-saving design possible. Also are the components of the drive motor protected in the inner diffuser.
  • two openings are provided on the inner diffuser, which are designed to conduct a flow of cooling air via the electronics of the drive motor.
  • the support unit is preferably formed by four support arms, which are connected to the end of the external diffuser at the axial end of the external diffuser across the flow cross section.
  • the touch protection grid is preferably arranged on the support arms. If necessary, an air socket is provided on the carrying unit.
  • an axial fan with a drive motor, fan blades and guide vanes is provided, the fan blades and the guide vanes being arranged one behind the other in the direction of flow in a circular-cylindrical fan nozzle.
  • An external diffuser is arranged after the fan nozzle, with the fan nozzle being designed in two parts in the direction of flow. A portion of the fan nozzle encloses the fan blades and a portion of the fan nozzle includes the vanes.
  • the part of the fan nozzle with the guide vanes and the outer diffuser are designed in one piece, with the inner diffuser being connected to the fan nozzle via the guide vanes.
  • the inner diffuser is cylindrical and extends in the axial direction after the fan blades to the axial end of the outer diffuser, with the fan nozzle and the outer diffuser being made of sheet metal.
  • the sheet metal jacket consisting of the fan nozzle and the outdoor fan is designed in two parts.
  • a first part contains the fan nozzle including the area in which the fan blades are arranged.
  • the second part is the area of the fan nozzle with the guide vanes and the outer diffuser as well as the Arranged inner diffuser and this casing is in turn designed as a part, which is designed to be connected to the first part.
  • the internal diffuser is designed as a dodecagon in cross section.
  • the dodecagon has twelve corners connected by straight sections.
  • the axial fan is particularly advantageously designed according to the configuration described above in that twelve guide vanes are provided, which are preferably arranged in the area of the fan nozzle, connecting the inner diffuser to the outer diffuser.
  • the guide vanes are designed as angle plates and are arranged tangentially offset between the inner diffuser and the outer diffuser.
  • the outer diffuser is formed in the axial direction, the direction of flow, first from a transition area and then from a diffuser area with a different geometry.
  • the ratio of the length of the transition area to the diffuser area is particularly advantageous to design the ratio of the length of the transition area to the diffuser area to be 1 to 4 in the axial direction. This means that the transition area makes up one fifth of the total length of the outer diffuser.
  • a particularly advantageous embodiment results from the fact that the drive motor is fastened with a motor mount on the edge of the fan nozzle on the flow inlet side and is designed to be completely integrated into the sheet metal housing.
  • a touch protection grid is optionally arranged, which covers the entire flow cross section. This is to prevent objects from touching or getting into the effective range of the rapidly rotating fan blades.
  • the increase in the efficiency of the overall fan-diffuser system is particularly advantageous, with not only the fan in the narrower sense being considered through an optimized blade geometry, but also the subsequent outflow via the diffuser.
  • the use of the diffuser effect enables an energetic gain compared to other systems, since the dynamic pressure of the air flow is converted into static pressure by the increase in diameter, which is reflected in the reduction in the outflow speed.
  • the guide vanes also optimize the system by directing the air swirl.
  • the individual components are made of sheet metal, which means that applications can also be implemented that cannot be implemented in systems with plastic components in terms of size and resilience. Because the components are made of sheet metal, the axial fan can be used at very high but also at very low outside temperatures and in locations with adverse weather conditions. Further advantages arise, for example, with regard to the possible color scheme and the material durability through the use of sheet metal instead of plastics.
  • the design of the axial fan with the two-part fan nozzle which does not belong to the invention, is also particularly advantageous, since the two-part design means that very large diameters can be designed as a sheet metal construction.
  • An additional advantage is that a combination of an axial compressor with the appropriate diameter of the fan nozzle with the part of the guide device with the diffuser and the touch protection grille is possible as an optional retrofit unit. Subsequent assembly can be carried out on the pre-assembled fan nozzle. This considerably simplifies the handling and the transport options for axial fans with guide devices and diffusers.
  • the increase in the efficiency of the fans is achieved by a Lowering of the energy consumption with the same volume flow and the reduction of the sound values.
  • Fig. 1a a perspective sectional view of an axial fan 1 is shown.
  • the shown advantageous configuration of the axial fan 1 is made up of a one-piece, circular-cylindrical fan nozzle 2 and an external diffuser 3 adjoining it in the axial direction.
  • the outer diffuser 3 is covered at its outer limit in the axial direction over the entire cross section by a touch protection grid 9 .
  • the drive motor 5 is held by a carrying unit 4 via carrying arms 14 at the end of the outer diffuser 3.
  • the drive motor 5 drives the fan blades 6 in the fan nozzle 2 .
  • An air flow with a flow direction 10 is generated by the fan blades 6 and moves in the axial direction from the fan nozzle 2 through the outer diffuser 3 .
  • An internal diffuser 8 is arranged coaxially to the fan axis and is designed as a circular-cylindrical tube in cross section.
  • the special feature of the illustrated embodiment is that the carrying unit 4 carries the drive motor 5 and this is carried only by the one-piece outer diffuser 3 and the fan nozzle 2 without further attachment.
  • the drive motor 5 is connected to the end of the outer diffuser 3 via the support arm construction of the support unit 4 and has no additional support in the area of the fan nozzle 2 or in the axial direction from below and thus appears to be floating.
  • Another advantage of this configuration is that the support unit 4 as a support arm construction for the motor mount and the contact protection grille 9 are located very far away from the fan blades 6 and their influence and disruptive effect on the fan blades 6 is therefore minimal.
  • Guide vanes are optionally integrated, which are then arranged after the fan blades 6 in the air flow direction.
  • FIG. 1b the support unit 4 of an axial fan is shown in a perspective enlarged view without the fan nozzle and the outer diffuser.
  • the drive motor 5 and the fan blades 6 are also shown in this view.
  • the support unit 4 essentially consists of the support arms 14, which are arranged on the circumference and at the upper end of a cylindrical tube and extend radially outwards from this tube.
  • the upper end of the cylindrical tube is closed by a cap 17 which, however, is designed to be removable for maintenance or assembly purposes. This makes it possible, for example, to allow access to the electronics of the drive motor 5 without having to disassemble the protective grille.
  • a support ring 15 is arranged and welded to the cylindrical tube of the Drive motor 5 holders.
  • the support ring 15 is preferably welded to the tube and has receptacles for the drive motor 5 .
  • the support ring 15 is designed, for example, in the manner of a flange, and the drive motor 5 is connected to the support ring 15 via screw connections. A part of the drive motor 5 is accommodated by the cylindrical tube, so that a very compact design is possible.
  • the cylindrical tube is positioned downstream of the fan blades 6 so that the cylindrical tube acts as an internal diffuser 8 .
  • An air stub 16 is arranged on the inner diffuser 8 .
  • an embodiment of an external diffuser 3 and a fan nozzle 2 is shown in a one-piece design in a side view.
  • the outer diffuser 3 is widened in the axial direction at the end of the fan nozzle 2 first in a transition area 12 and then in the diffuser area 11 with different radii of bending or curvature in the radial direction.
  • the ratio of the length of the transition area 12 to the diffuser area 11 is one to four in the axial direction, so that four-fifths of the outer diffuser 3 is designed as a diffuser area 11 and one-fifth as a transition area 12 .
  • FIG. 3 an area of the fan nozzle 2 and the outer diffuser 3 is shown in longitudinal section, whereby the inner diffuser 8 becomes visible. Also shown is the area of the fan nozzle 2 with the trailing vanes 7 which is arranged towards the outer diffuser 3 .
  • the representation according to 3 thus shows the second part of the two-part configuration of fan nozzle 2 and external diffuser 3 with the transition area 12 according to the illustrations in FIG Fig. 1a and figure 1 b.
  • a plan view is shown axially and opposite to the flow direction and a perspective view of an axial fan 1, wherein in the plan view according to 4 the outer diffuser 3 appears as a circular ring, whereas the circular-cylindrical fan nozzle 2 as the inner Boundary line of this annulus is shown.
  • the inner diffuser 8 is designed as a dodecagon, as a so-called dodecagon, with a guide vane 7 being designed as a sheet metal construction of angled sheets on each of its straight sides.
  • the guide vanes 7 are not arranged radially but offset tangentially to the axis of rotation of the fan blades, which are not shown here. Depending on a different operating point, sixteen guide vanes 7 may be used.
  • the axial fan 1 is completed in the representations according to FIG 4 and 5 by the contact protection grille 9, which forms an intervention protection and also a protection against destruction for the moving fan blades, not shown.
  • FIG. 6 shows an application of an axial fan 1 positioned in relation to heat exchangers 13 arranged in a V-shape, the air being sucked in from below by the axial fan 1 through the heat exchanger 13 and conveyed out of the axial fan 1 in the flow direction 10 .
  • FIG 7a a sectional view of an axial fan 1 is shown.
  • the shown advantageous configuration of the axial fan 1 consists of a circular-cylindrical fan nozzle 2 and an axial extension or widening of the circular-cylindrical fan nozzle 2 with guide vanes 7 and an external diffuser 3 connected thereto.
  • the outer diffuser 3 is covered at its outer limit in the axial direction over the entire cross section by a touch protection grid 9 .
  • the drive motor 5 is held by a motor mount 4 on the suction side of the axial fan 1, the motor mount 4 being supported on the fan nozzle 2 made of sheet metal.
  • the drive motor 5 drives the fan blades 6 in the fan nozzle 2 .
  • An air flow with a flow direction 10 is generated by the fan blades 6 and moves in the axial direction from the fan nozzle 2 via the guide vanes 7 and through the outer diffuser 3 .
  • Coaxial to the fan axis is a Arranged inner diffuser 8, which is designed in cross section as a dodecagon.
  • the special feature of the illustrated embodiment is that the fan nozzle and diffuser are composed of two parts, which results in advantages in terms of assembly and handling.
  • the drive motor 5 is designed to be completely accommodated by the inner diffuser 8 .
  • Figure 7b is the axial fan 1 according to Figure 7a shown in a perspective view in section. This view shows the three fan blades 6 and some of the trailing vanes 7 that are offset for the radial alignment.
  • the outer diffuser 3 is delimited at its upper edge by the contact protection grille 9.
  • the guide vanes 7 are connected to the inner diffuser 8 on one side and to the fan nozzle 2 on the other side.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Claims (5)

  1. Ventilateur axial (1) avec un moteur d'entraînement (5) et des pales de ventilateur (6) ainsi qu'une buse de ventilateur (2) cylindrique circulaire et un diffuseur extérieur (3) s'y raccordant, la buse de ventilateur (2) et le diffuseur extérieur (3) étant réalisés d'une seule pièce et en tôle, une unité de support (4) qui forme simultanément un diffuseur intérieur (8) de forme cylindrique étant prévue pour le moteur d'entraînement (5), et le diffuseur intérieur (8) s'étendant en dans le sens axial vers les pales du ventilateur (6) jusqu'à l'extrémité axiale en aval de l'écoulement du diffuseur extérieur (3), l'unité de support (4) étant constituée de bras de support (14), d'un tube cylindrique en tant que diffuseur intérieur (8) et d'une bague de support (15), et le moteur d'entraînement (5) étant fixé à la bague de support (15) et étant agencé en étant logé au moins en partie dans le diffuseur intérieur (8), la bague de support (15) étant disposée au niveau de l'extrémité en amont de l'écoulement du tube cylindrique et le diffuseur extérieur (3) étant recouvert au niveau de sa limite extérieure dans le sens axial par une grille protégeant des contacts tactiles (9) sur toute la section transversale, et le moteur d'entraînement (5) étant relié par la construction des bras de support de l'unité de support (4) à l'extrémité en aval de l'écoulement du diffuseur extérieur (3).
  2. Ventilateur axial (1) selon la revendication 1, caractérisé en ce que deux ouvertures sont prévues au niveau du diffuseur intérieur (8) qui sont réalisées pour diriger un écoulement d'air de refroidissement par-dessus l'ensemble électronique du moteur d'entraînement (5).
  3. Ventilateur axial (1) selon la revendication 1 ou 2, caractérisé en ce que l'unité de support (4) présente quatre bras de support (14) qui sont reliés au niveau de l'extrémité axiale en aval de l'écoulement du diffuseur extérieur (3) à l'extrémité en aval de l'écoulement du diffuseur extérieur (3) par-dessus la section transversale d'écoulement.
  4. Ventilateur axial (1) selon la revendication 3, caractérisé en ce que la grille protégeant des contacts tactiles (9) est disposée sur les bras de support (14).
  5. Ventilateur axial (1) selon l'une quelconque des revendications 1 à 4, caractérisé en ce qu'une tubulure d'air (16) est disposée au niveau de l'unité de support (4).
EP15189055.5A 2014-10-13 2015-10-09 Ventilateur axial avec diffuseur interne et externe Active EP3009682B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102014114798.7A DE102014114798A1 (de) 2014-10-13 2014-10-13 Axialventilator mit Außen- und Innendiffusor

Publications (2)

Publication Number Publication Date
EP3009682A1 EP3009682A1 (fr) 2016-04-20
EP3009682B1 true EP3009682B1 (fr) 2023-08-02

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Application Number Title Priority Date Filing Date
EP15189055.5A Active EP3009682B1 (fr) 2014-10-13 2015-10-09 Ventilateur axial avec diffuseur interne et externe

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EP (1) EP3009682B1 (fr)
DE (1) DE102014114798A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106839535A (zh) * 2017-01-26 2017-06-13 上海宝丰机械制造有限公司 扩压管及包括其的蒸发式冷凝器
CA3056237A1 (fr) 2017-03-20 2018-09-27 Shop Vac Corporation Ventilateur axial a carter forme par des pieces rattachables et comprenant des nervures de guidage d'air et une rampe interne
DE102018004605B4 (de) * 2018-06-11 2022-09-01 Felix Müller Lüfteraufsatz zur Optimierung der Mischungsventilation
US11781563B1 (en) 2022-05-20 2023-10-10 Hudson Products Corporation Air-cooled heat exchanger with X-brace drive
CN115342078B (zh) * 2022-10-20 2023-03-24 杭州顿力电器有限公司 一种带模块扩压结构的高效离心风机

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US2397171A (en) * 1943-12-06 1946-03-26 Del Conveyor & Mfg Company Fan and motor mounting
US2435645A (en) * 1945-08-23 1948-02-10 Westinghouse Electric Corp Axial flow fan
JPH0311114A (ja) * 1989-06-09 1991-01-18 Nippondenso Co Ltd 熱交換器に付設されるファン装置

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US1940790A (en) 1930-10-18 1933-12-26 Walter S Diehl Fluid conducting passage
GB584657A (en) * 1945-01-19 1947-01-20 Michael Thaddius Adamtchik Improvements in or relating to axial flow screw fans and the like
US3346174A (en) * 1966-07-05 1967-10-10 Trane Co Compact axial flow fan
DE59204947D1 (de) 1992-08-03 1996-02-15 Asea Brown Boveri Mehrzoniger Diffusor für Turbomaschine
FR2697287B1 (fr) 1992-10-26 1994-12-09 Europ Gas Turbines Sa Diffuseur d'échappement de turbine à gaz.
FR2725478B1 (fr) * 1994-10-11 1996-12-27 Clima Neu Sa Ventilateur helicoide a virole
DE102007005722A1 (de) * 2007-01-31 2008-08-07 Hans Joachim Leithner Laufrad für einen Axialventilator
US8622695B2 (en) * 2009-08-12 2014-01-07 Xcelaero Corporation Flow trim for vane-axial fans
DE102011015784A1 (de) * 2010-08-12 2012-02-16 Ziehl-Abegg Ag Ventilator
DE202011004708U1 (de) * 2010-08-12 2011-07-14 Ziehl-Abegg Ag Ventilator
DE202010016820U1 (de) 2010-12-21 2012-03-26 Ebm-Papst Mulfingen Gmbh & Co. Kg Diffusor für einen Ventilator sowie Ventilatoranordnung mit einem derartigen Diffusor

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2397171A (en) * 1943-12-06 1946-03-26 Del Conveyor & Mfg Company Fan and motor mounting
US2435645A (en) * 1945-08-23 1948-02-10 Westinghouse Electric Corp Axial flow fan
JPH0311114A (ja) * 1989-06-09 1991-01-18 Nippondenso Co Ltd 熱交換器に付設されるファン装置

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Publication number Publication date
EP3009682A1 (fr) 2016-04-20
DE102014114798A1 (de) 2016-04-14

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