EP2657531A1 - Ventilateur axial avec redresseur à effet centripète ayant un moyeux de diamètre réduit - Google Patents

Ventilateur axial avec redresseur à effet centripète ayant un moyeux de diamètre réduit Download PDF

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Publication number
EP2657531A1
EP2657531A1 EP20130165560 EP13165560A EP2657531A1 EP 2657531 A1 EP2657531 A1 EP 2657531A1 EP 20130165560 EP20130165560 EP 20130165560 EP 13165560 A EP13165560 A EP 13165560A EP 2657531 A1 EP2657531 A1 EP 2657531A1
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EP
European Patent Office
Prior art keywords
fixed
fan
cooling device
fins
diameter
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.)
Withdrawn
Application number
EP20130165560
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German (de)
English (en)
French (fr)
Inventor
Marcel Briand
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.)
SDMO Industries SAS
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SDMO Industries SAS
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Filing date
Publication date
Application filed by SDMO Industries SAS filed Critical SDMO Industries SAS
Publication of EP2657531A1 publication Critical patent/EP2657531A1/fr
Withdrawn legal-status Critical Current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
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P5/00—Pumping cooling-air or liquid coolants
    • F01P5/02—Pumping cooling-air; Arrangements of cooling-air pumps, e.g. fans or blowers
    • F01P5/06—Guiding or ducting air to, or from, ducted 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
    • 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
    • F04D29/542—Bladed diffusers
    • F04D29/544—Blade shapes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2070/00—Details
    • F01P2070/50—Details mounting fans to heat-exchangers

Definitions

  • the field of the invention is that of cooling systems based on fans. More specifically, the invention relates to a cooling device comprising one or more axial fans, for driving a cooling fluid (for example a mass of air) to an element whose temperature is sought to lower.
  • a cooling fluid for example a mass of air
  • the invention finds particular, but not exclusively, applications in the field of cooling of thermal engines, for example when they are integrated in a generator.
  • Axial fans or helical fans, are commonly used for cooling industrial plants. Their operating principle is based on the rotation of a propeller, comprising a plurality of movable blades, which makes it possible to axially drive a cooling fluid, along the axis of rotation of the propeller, towards an equipment that the it is desired to cool.
  • Such fans operate with any type of compressible fluid, but most often with ambient air. They allow to blow fresh air to the equipment to cool.
  • the air flow of such an axial fan is in a ventilation nozzle, allowing the flow of fresh air to the equipment to be cooled.
  • the patent document FR 2 784 423 proposes a solution to this first problem, in the form of an air duct for an electric fan comprising movable blades and interconnecting elements extending between an outer annular element and an inner annular element coaxial with the movable blades.
  • Such interconnection elements deflect the flow of air towards the axial direction.
  • the air flow is placed in the expected direction to cross the radiator, so that the penetration of air into the radiator beam is promoted.
  • a second problem encountered when using axial fans is that the centrifugal effect related to the rotation of the fan blades has the effect of increasing the flow rate, and therefore the pressure on the periphery of the fan; conversely, a zone of low pressure is generated in the center of the discharge zone.
  • an inactive cone is formed, downstream of the fan with respect to the direction of movement of the fluid, constituting a "dead" zone in which the pressure and the ventilation rate are weak or even null.
  • FIG. 1 Such an inactive cone is illustrated in figure 1 , which is derived from a calculation of CFD (for "Computer Fluid Dynamic”), and illustrates the distribution of fluid velocities in the fan environment.
  • CFD Computer Fluid Dynamic
  • the fan 1 when its blades rotate, sucks air, which is transmitted via a ventilation nozzle 2, to a device that is to be cooled, in this case a cooling radiator 3.
  • an inactive cone 4 whose base is located at the base of the fan blades 1, is formed downstream of the fan 1 with respect to the direction of displacement of the air flow. top may be more or less distant from the fan, depending on the characteristics and dimensions of the last.
  • the speed of movement of the air is almost zero.
  • the air flow rate in the inactive cone 4 may even be negative, if the pressure downstream of the cooling radiator 3 is greater than that of this dead zone: a recycling phenomenon then occurs, so that hot air downstream of the radiator passes back into the dead zone of the cone 4, which causes a loss of efficiency of the system consisting of the fan 1 and the radiator 3.
  • the radiator 3 thus receives fresh air blown by the fan 1 over its entire surface with the exception of the central zone 6 in the inactive cone 4.
  • the entire surface of the cooling radiator 3 is therefore not optimally used for heat exchange, which leads to a loss in useful dimensions, and therefore a decrease in the efficiency of the assembly consisting of the fan 1 and the radiator 3.
  • one solution is to move the radiator 3 (or more generally the equipment that one seeks to cool), the fan 1. Indeed, by placing the radiator sufficiently far from the fan, it manages to extract the radiator of the influence of the inactive cone 4.
  • the invention responds, in all or part of its aspects, to at least one of these needs by proposing a cooling device for a generator set comprising at least one axial fan comprising at least two rotating blades capable of driving a cooling fluid, through a ventilation nozzle, to an element to be cooled.
  • a cooling device comprises at least two fixed fins arranged opposite said movable blades in said ventilation nozzle.
  • the invention is based on a completely new and inventive approach to axial fan cooling.
  • such fixed fins disposed in the ventilation nozzle of the fan produce two combined effects: firstly, they allow a centripetal rectification of the flow of the cooling fluid, so as to remove the inactive cone and provide a flow rate of fluid through the dead zone behind the fan hub, and secondly, they make it possible to counter the rotation of the fan. coolant caused by the drive effect of the fan blades.
  • Their presence in the ventilation nozzle that is to say downstream of the fan relative to the direction of movement of the cooling fluid, thus increases the efficiency of the fan.
  • fixed fins are meant here, and throughout the rest of this document, blades fixed in rotation, as opposed to the blades of the fan.
  • fixed vanes could be adjustable or steerable, for example to modify an angle of inclination of all or part of the vanes with respect to the direction of displacement of the fluid.
  • Such fins can take various forms suitable for straightening the flow of air, or more generally fluid, from the fan, from the simplest to the most complex.
  • the curved shape of the fixed vanes is defined such that at any relative position of the movable vanes of the ventilator, one or more fixed vanes has a relative angle capable of transforming the tangential velocity of the fluid propelled into a radial velocity directed towards the center of the on the one hand, and transform the tangential velocity into axial velocity to straighten the flow and to promote the penetration of air into the radiator beam, on the other hand.
  • the mobile blades being fixed at their proximal end to a central hub, the fixed blades are connected at their proximal end to a connecting device of diameter less than or equal to the diameter of the central hub of the fan.
  • the fan has a central hub, on which are fixed the movable blades, which is an inactive area with respect to the flow of air or fluid.
  • the connecting device In order not to aggravate the phenomenon of appearance of this inactive zone, and not to degrade the centripetal rectification effect produced by the fixed vanes, it is therefore advantageous to limit the dimensions of the connecting device so that its outside diameter remains less than or equal to the diameter of the central hub of the fan.
  • such a connecting device comprises a tube on which are fixed the proximal ends of the fixed wings and a reinforcing disk, located near the central hub, the diameter of the tube being substantially less than the diameter of the disc of reinforcement, and the diameter of the reinforcing disc being less than or equal to the diameter of the central hub.
  • such a connecting device has substantially a cone-shaped or cone-shaped curved surface, whose diameter decreases away from the central hub to the element to be cooled.
  • Such forms are particularly suitable for producing a piece of plastic molding, which is advantageous.
  • a cone-shaped cone shape with a curved surface facilitates the reorientation of the centripetal flow towards the desired axial direction and sought for passing the cooling air through the beam, in the central area of the radiator.
  • the fixed fins are of curved shape and have a curvature in a plane substantially perpendicular to an axis of rotation of the movable blades, called the plane of rotation.
  • such fixed vanes have a direction of curvature adapted to direct a portion of said fluid driven by said movable blades towards the axis of rotation of said fan.
  • Such fins can be simple in shape, and therefore inexpensive. They make it possible to use the dynamic effect of the flow of air or fluid to guide part of the flow to the central zone downstream of the fan.
  • said fixed wings have, at their distal end, a non-zero angle with said axis of rotation.
  • the angle formed between the string of the fins and the axis of rotation is non-zero.
  • Such an inclination of the distal ends of the fins makes it possible to optimize the distribution of the air pressure generated by the fan on either side of the fixed vanes, and to avoid the formation of low pressure zones behind the fixed vanes. . It also reduces the noise generated by the passage of the mobile blades of the fan facing fixed fins, which induces the creation of a pressure wave.
  • the angle formed between the string of the fin at its distal end and the axis of rotation is substantially equal to 45 °.
  • Such an angle makes it possible to optimize the distribution of pressures upstream and downstream of the fixed fins, and thus to avoid a cavitation effect.
  • Other values of this angle may also be adopted, depending in particular on the shape of the fixed vanes and the operating constraints imposed on the cooling device. An optimum value of this angle can be determined for example by CFD calculation or by focusing during performance tests.
  • said fixed wings are twisted.
  • they turn on their own, over their entire length, so as to increase the phenomenon of fluid flow rectification and improve the distribution of the air pressure and therefore the flow on the surface of the radiator.
  • these fins are preferably less than a full half turn on themselves. Such twisting may be progressive and increase from the center of the fins towards their distal end.
  • such a cooling device comprises a number N of fixed blades different from the number P of the mobile blades of the fan, in order to avoid the generation of noise by the superposition of acoustic pressure waves generated at the passage of each movable blade in front of a fixed fin.
  • the number N of fixed vanes and the number P of the mobile blades of the fan are two prime numbers between them, in order to reduce as much as possible the resonance phenomenon likely to generate noise.
  • the number N of fixed vanes and the number P of the mobile blades of the fan are two prime numbers between them, in order to reduce as much as possible the resonance phenomenon likely to generate noise.
  • such a cooling device comprises identical equidistant fixed fins, for example seven in number.
  • the fact that the fins are identical and equidistant makes it possible to obtain a homogeneous rectification of the flow of air or fluid over the entire blower footprint.
  • said fixed wings are connected at their distal end to a substantially annular element of diameter greater than the diameter of said axial fan, said substantially annular element having a flared shape on a portion extending upstream of said fan axial, so as to create a Venturi effect on said cooling fluid.
  • Such a shape contributes to the improvement of the efficiency of the fan.
  • said element to be cooled is a cooling radiator of a thermal engine cooling system.
  • thermal engine cooling systems are generally equipped with one or more cooling radiators, using ambient air to cool the various fluids circulating in the radiators (cooling water of the engine block, charge air, oil , fuel, etc.).
  • the cooling of the radiators is done by pulsed air by one or more axial fans blowing fresh air through the radiator beam.
  • the congestion constraint is generally a strong constraint, so that it is difficult to follow the recommendations of the fan manufacturers, who recommend placing the radiator as far as possible as far as possible from the fan (for example, according to certain specifications, at a distance of at least one and a half times the diameter of the fan), in order to extract it from the zone of influence of the inactive cone.
  • the invention therefore applies particularly advantageously in this context.
  • the invention also relates to a generator comprising a heat engine and an alternator connected to said heat engine and adapted to convert into electrical energy energy received from said engine.
  • such a generator set comprises at least one cooling device as described above.
  • the invention also relates to a generator characterized in combination by all or some of the characteristics mentioned above or below.
  • a generator is an autonomous device for producing electrical energy from a heat engine.
  • a generator makes it possible either to mitigate a power outage of the public grid, or to power electrical appliances in areas without access to the public electricity grid.
  • the heat engine rises in temperature, and it is It is important to provide the generator with an adequate cooling system to keep the temperature within an acceptable range to maintain proper operation.
  • Such a cooling system also avoids the deterioration of the engine and other components of the generator, which could be caused by the rise in temperature related to the heat discharges of its components.
  • such a cooling system generally comprises a radiator 3, in which circulates a fluid to be cooled (cooling water of the engine block, charge air, oil, fuel, etc.).
  • An axial fan 1 blows fresh air through the radiator bundle 3.
  • the air flow of this fan 1 is in a ventilation nozzle 2, which serves as a supply manifold for the radiator 3.
  • the air is propelled tangentially and radially towards the outside, by the centrifugal effect generated by the speed of rotation of the mobile blades.
  • the speed V of the air at the outlet of the blade therefore comprises a tangential component Vt and a radial component Vr (centrifugal effect), as illustrated in FIG. figure 8A .
  • This radial component of the air velocity results in a much greater flow rate, as well as greater pressure, in the peripheral areas of the fan.
  • the flow rate and the pressure are low or even zero or even negative in the central zone of rejection (dead cone).
  • the fan In order to maintain the operating temperature of the generator set within an acceptable range, both to maintain a good efficiency and to prevent deterioration of its components, it is important that the fan be as efficient as possible. According to the invention, and as illustrated on the figure 4 , therefore introduced into the ventilation nozzle 2 a set of fixed vanes 7, which form a counter-rotating system preventing the rotation of the air by the movable blades of the fan 1. By blocking the rotation of the mass of d air, thus improves the relative speed of the fan blades relative to the air, and thus the efficiency of the fan.
  • the generating sets being subjected to severe space constraints (they must remain compact to satisfy the user), it is not possible to solve the problem of the appearance of an inactive cone downstream of the fan 1 by retreating the radiator 3.
  • the shape of the fixed vanes 7, formed and / or mounted in the ventilation nozzle 2 is thus chosen so as to reduce the air flow displaced by the rotating blades of the fan 1 towards the corresponding central zone, according to FIG. prior art, to the zone of formation of the inactive cone. In doing so, we cancel the effect of this inactive cone.
  • curved fixed fins are chosen, the curvature of which uses the dynamic effect of the pulsed air to return a part towards the center by centripetal effect.
  • the curved shape of the fixed vanes is defined so that at any relative position of the mobile blades of the fan, the angle of incidence of the air flow propelled at the outlet of the fan blade on a fixed vane is such that it makes it possible to transform the tangential velocity Vt of the incident air into a radial velocity Vr directed towards the center.
  • This component Vr of the speed comes to oppose the centrifugal speed Vr created by the rotation of the fan (see figure 8A ) and according to the shape and curvature of the fixed fins, its standard may be equal to or greater than that of the centrifugal speed Vr.
  • centripetal function of the fixed fins of the invention corrects this problem and provides homogeneity of the airflow over the entire exchange surface.
  • the fixed fins of the invention produce a complementary effect, namely the rectification of the air flow in rotation, to make it an axially directed flow, in order to improve the efficiency. of the cooling system, placing the airflow in the expected direction to cross the radiator.
  • ⁇ 45 ° at the distal end of the fixed fins. Note that this value can be optimized according to the geometries of fixed blades and moving blades used, for example by CFD calculation.
  • This angle ⁇ makes it possible to straighten the flow of air, and to transform the tangential velocity of the air at the outlet of the moving blade into axial velocity, to favor the penetration of the air into the radiator bundle.
  • Axial positioning of the air flow also results in a reduction of the noise generated by friction of the air against the fins and other asperities of the radiator. Without this rectifying effect, the air is driven by a rotational movement at the outlet of the fan, and this, at a speed of rotation close to that of the fan. This tangential speed acts as a "wind instrument" on the radiator beam.
  • Ventilation represents a very important contribution to the overall noise of a generator type machine.
  • the presence of a rectifier according to the invention in the ventilation nozzle of a generator makes it possible to very significantly reduce the overall noise of the group (for example a reduction of the order of 3dBA on a soundproof group of 300kVA) .
  • the element referenced 9 corresponds to the ferrule placed around the fan and intended to improve the efficiency.
  • This ferrule corresponds to the elements referenced 24 and 25 on the Figures 11A and 11B .
  • the figure 5 presents in more detail the whole, taken from the figure 4 , comprising the ventilation nozzle 2 in which was mounted the system of fixed vanes 7, according to the invention.
  • these fins are seven in number, so that the number of movable blades of the fan 1, namely nine, and the number of fixed blades, namely seven, are two prime numbers between them, which avoids any phenomenon of resonance, and therefore to reduce the noise generated by the introduction of such fixed fins.
  • that of noise level is indeed also a strong constraint for generators.
  • Other combinations of numbers of fixed fins on the one hand and movable blades on the other hand are of course possible.
  • the arrow referenced 8 indicates the direction of rotation of the mobile blades of the fan 1 when it is in operation.
  • the fixed vanes are all identical and regularly distributed over the entire cavity of the fan 1.
  • fins, equidistant from each other, are, in this embodiment, of particularly simple shape, since they are each in the form of a ribbon, curved in a plane parallel to the plane of rotation of the fan 1, and whose The distal end is inclined at approximately 45 ° with respect to this plane of rotation.
  • the presence of the fixed wings vis-à-vis the mobile blades of the fan makes it possible to counteract the rotation of the air by the driving effect of the mobile blades of the fan 1.
  • Their curved shape makes it possible, in turn, to bring back the flow of air, by centripetal effect, towards the axis of rotation of the fan 1, in order to cancel the appearance of the inactive cone downstream of the fan.
  • such fixed fins can maintain, in the central area downstream of the fan, a sufficient pressure to supply the central zone with fresh air and prevent hot air from returning from the center of the radiator.
  • the inclination of approximately 45 ° at the end of the fins makes it possible to optimize the distribution of speed and air pressure on the radiator, avoiding the creation of a vacuum zone likely to form downstream of the fins. when such inclination does not exist.
  • Such inclination of the distal end of the fixed vanes also reduces the noise that may be generated by the passage of the movable blade of the fan in front of the fixed fin, which induces a pressure wave.
  • the value of the angle of the distal end of the fixed vane relative to the plane of rotation must be adapted on a case by case basis, for example by calculation of CFD, in order to reduce as far as possible the appearance of zones of depression. and / or the noise generated, depending on the objectives that we set. Such an adaptation must also take into account the shape of the fixed fin.
  • Such fixed fins may be made of any material appropriate to the type of cooling fluid considered. In the case of ambient air, these fins may be made of metal, or, for a lower production cost, plastic.
  • the set of fixed vanes can thus be made in the form of plastic molding, which is then reported in the ventilation nozzle. The cost of production can be further reduced by producing in a single block the assembly consisting of the ventilation nozzle and fixed fins.
  • FIGS. 6A to 6I specify the dimensions and shapes of the fixed vanes 7 in the exemplary embodiment given here by way of illustration.
  • the figure 7 illustrates the distribution of air velocities in the fan environment of the figure 2 after introducing a set of fixed vanes into the ventilation nozzle.
  • the fixed vanes disposed in the ventilation nozzle make it possible to supply the central zone with air, and to cancel the inactive cone of the figure 2 .
  • the fixed fins introduced into the ventilation nozzle have a curved ribbon shape, perpendicular along its length to the plane of rotation of the mobile blades of the fan.
  • the string of the fixed vanes form, at their distal end 31, a zero angle with the axis of rotation.
  • the figure 12 also illustrates such an embodiment, in which the rope fixed vanes 7 forms a zero angle with the axis of rotation referenced 33, over the entire length of these fixed vanes, ie their proximal end 30 at their distal end 31.
  • certain areas 10 of low pressure are formed behind the fixed fins. This defect can be corrected by tilting the distal end 31 of the fixed vanes, as mentioned above in connection with the figures 4 and 5 .
  • these cavitation zones 10 can be accentuated by modifying the shape of the fins to give them a more complex aerodynamic profile. It can thus be envisaged that the fins have a section profile non-symmetrical, that is to say that they have a lower surface and an upper surface of different shapes.
  • the shape, number and inclination of the fins can be optimized with respect to the example presented here, so as to optimize the efficiency of the cooling system considered.
  • the fins may have more complex shapes of propeller blades, for example.
  • the implementation of the invention has made it possible to lower the temperature of the radiator by 3 ° C., while keeping it at a distance from the radiator fan. only 10 to 15 cm.
  • the fan referenced 1 has a central hub 11, which is inactive with respect to the air flow.
  • the base of the fan blades is hooked on this hub 11.
  • this zone situated directly behind the hub of the fan to fix and stiffen the fixed vanes of the flow straightener.
  • this surface can be used, for example, to have a binding reinforcement disc 20 for fixed fins.
  • the shape used in the central area of the rectifier may range from a disc 20 to a cone 21, or use a more complex shape 22 of curved surface cone. These last two forms are particularly suitable for producing a piece made of plastic molding.
  • the fixed vanes 7 can be fixed at their proximal end to a connecting tube 23, and the assembly can be stiffened by means of the disc of reinforcement 20 on which are also fixed fixed fins 7.
  • the fixed vanes 7 are fixed at their proximal end to a cone 21, 22 which serves the dual role of means of assembly and stiffening.
  • the fixed wings are assembled to an annular element 25 of diameter greater than or equal to the diameter of the fan 1.
  • This annular element 25 has a flared portion 24, upstream of the fan, so as to create a Venturi effect on the air flow entering the fan 1.
  • the diameter of the disk 20 or that of the base of the cone 21, 22 equal to or smaller than that of the hub 11 of the fan 1 is preferably chosen.
  • the optimization of the central shape of the rectifier can be carried out for each application by CFD calculation or by results of experiments (each fan diameter having the associated rectifier).
  • the Figures 12 and 13 show two embodiments of fixed fins 7 of the invention.
  • the fixed vanes 7 are in the form of a ribbon, which is parallel to the axis of rotation 33 of the mobile blades of the fan, the proximal end of the fins 7 at their distal end 31.
  • the fixed vanes 7 are elsewhere assembled together at their proximal end 30 along an edge 23, which may be in the form of a small diameter tube.
  • the fixed vanes 7 are fixed to an annular element 25, or to the ventilation nozzle 2, by means of a tab or an attachment element 40.
  • Such a fixing lug 40 may be formed in the fin 7 at its distal end 31.
  • the fixing lug 40 may be connected to the annular element 25 or to the ventilation nozzle 2.
  • the fixing lugs 40 may not be integrally formed with the fixed fins 7, but attached to these fins at their distal end 31. They may also be integrally formed with the annular element 25.
  • the annular element 25 to which are connected the fixed fins 7 at their distal end 31 is substantially in the form of a cylinder whose axis of revolution corresponds to the axis of rotation of the mobile blades of the fan.
  • the fixed vanes 7 are thus disposed inside the cylinder formed by this annular element 25.
  • the fixed vanes 7 are directly secured to the inner wall of the annular element 25.
  • the figure 14 shows an example of a cooling system 100, which comprises a ventilation nozzle 2 surrounding an axial fan 1 and a radiator 3.
  • figure 15 illustrates the cooling system of the figure 14 , in which, in the ventilation nozzle 2, fixed vanes 7 have been added.
  • the fixed vanes 7 can be secured to an outer annular element 25, so that the annular element 25 can be secured to the ventilation nozzle. 2 in various ways, for example by welding, by screwing, by means of rivets, by gluing, by molding, etc.
  • the figure 16 shows an exemplary embodiment of the cooling system 100, wherein the outer annular element 25 is also formed around the axial fan 1 and has, at the level of the air inlet, a flared form of venturi type. This shape makes it possible to improve the flow of air at the inlet of the axial fan 1 and improves the efficiency of the cooling system 100.
  • the annular element 25 may have openings between the fixed vanes 7, way to supply air to the external areas of the radiator 3, especially when the latter has a rectangular shape.
  • the fixed vanes 7, in turn, can generate sufficient pressure in the central zone 6 to force the cooling air towards the central zone 6.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Motor Or Generator Cooling System (AREA)
EP20130165560 2012-04-26 2013-04-26 Ventilateur axial avec redresseur à effet centripète ayant un moyeux de diamètre réduit Withdrawn EP2657531A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1253889A FR2989999B1 (fr) 2012-04-26 2012-04-26 Dispositif de refroidissement comprenant un ventilateur axial a redressement de flux centripete et groupe electrogene correspondant.

Publications (1)

Publication Number Publication Date
EP2657531A1 true EP2657531A1 (fr) 2013-10-30

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Application Number Title Priority Date Filing Date
EP20130165560 Withdrawn EP2657531A1 (fr) 2012-04-26 2013-04-26 Ventilateur axial avec redresseur à effet centripète ayant un moyeux de diamètre réduit
EP13719815.6A Not-in-force EP2841771B1 (en) 2012-04-26 2013-04-26 Axial flow cooling fan with centripetally guiding stator vanes

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP13719815.6A Not-in-force EP2841771B1 (en) 2012-04-26 2013-04-26 Axial flow cooling fan with centripetally guiding stator vanes

Country Status (9)

Country Link
US (1) US9790959B2 (ru)
EP (2) EP2657531A1 (ru)
CN (1) CN104302928A (ru)
BR (1) BR112014026099A2 (ru)
ES (1) ES2622581T3 (ru)
FR (1) FR2989999B1 (ru)
RU (1) RU2621585C2 (ru)
WO (1) WO2013160432A1 (ru)
ZA (1) ZA201406779B (ru)

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CN112534123A (zh) * 2018-05-31 2021-03-19 法雷奥热系统公司 用于安装到机动车辆的切向风扇的叶轮、切向风扇、通风设备和用于机动车辆的热交换模块

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TWM497203U (zh) * 2014-10-15 2015-03-11 Zhen-Ming Su 改良式內旋渦流氣旋導風罩及包含其的風扇裝置
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ZA201406779B (en) 2015-10-28
BR112014026099A2 (pt) 2017-07-18
EP2841771A1 (en) 2015-03-04
EP2841771B1 (en) 2017-02-08
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US20150125287A1 (en) 2015-05-07
ES2622581T3 (es) 2017-07-06

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