EP3631210B1 - Ventilator und vorleitgitter für einen ventilator - Google Patents

Ventilator und vorleitgitter für einen ventilator Download PDF

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Publication number
EP3631210B1
EP3631210B1 EP18734423.9A EP18734423A EP3631210B1 EP 3631210 B1 EP3631210 B1 EP 3631210B1 EP 18734423 A EP18734423 A EP 18734423A EP 3631210 B1 EP3631210 B1 EP 3631210B1
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EP
European Patent Office
Prior art keywords
fan
guide
grid
grille
webs
Prior art date
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Active
Application number
EP18734423.9A
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German (de)
English (en)
French (fr)
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EP3631210A2 (de
Inventor
Frieder Loercher
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Ziehl Abegg SE
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Ziehl Abegg SE
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Publication date
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Priority to SI201831087T priority Critical patent/SI3631210T1/sl
Publication of EP3631210A2 publication Critical patent/EP3631210A2/de
Application granted granted Critical
Publication of EP3631210B1 publication Critical patent/EP3631210B1/de
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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
    • F04D29/66—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
    • F04D29/667—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by influencing the flow pattern, e.g. suppression of turbulence
    • 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
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
    • F04D29/4213—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps suction ports
    • 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
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/44—Fluid-guiding means, e.g. diffusers
    • F04D29/441—Fluid-guiding means, e.g. diffusers especially adapted for elastic fluid pumps
    • F04D29/444—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
    • 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
    • F05D2250/00—Geometry
    • F05D2250/50—Inlet or outlet
    • F05D2250/51—Inlet
    • 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
    • F05D2260/00—Function
    • F05D2260/60—Fluid transfer
    • F05D2260/607—Preventing clogging or obstruction of flow paths by dirt, dust, or foreign particles

Definitions

  • the present invention relates to a fan, which can be either a centrifugal fan or an axial fan.
  • the fan includes an impeller with a guide device in the flow path in front of the impeller and in front of an inlet nozzle.
  • a generic fan with an inflow-side guide device is, for example, from the WO 03/054395 A1 known.
  • the guide device provided there primarily serves to equalize the flow, in particular to reduce noise.
  • the known pre-direction device generates a pre-swirl in the direction of rotation of the impeller. What is important is that any acoustic improvements that may be achieved are regularly accompanied by losses in air performance and efficiency.
  • Another generic fan with an inflow guide device is from the EP 2 778 432 A1 known.
  • the present invention is based on the object of designing and developing a fan with a forward guide device in such a way that the air output and/or the efficiency is/are increased with improved, constant or at most slightly deteriorated acoustic values.
  • the tonal noise that occurs at the fan as a result of inhomogeneous inflow can be reduced because the guide grille evens out the inflow.
  • the guide grille should be inexpensive to manufacture and easy to install.
  • the aim is also to create a fan that is different from competing products.
  • the guide device is then designed as a guide grille with webs which are arranged and shaped in such a way that the flow is influenced in the circumferential direction with a substantially swirl-free inflow.
  • the term “bridge” is to be understood in the broadest sense.
  • the webs are arranged and shaped in such a way that a pre-swirl against the direction of rotation of the impeller is generated by a flow deflection in the circumferential direction.
  • the pre-swirl against the direction of rotation of the impeller has the effect of increasing air output and/or increasing efficiency compared to the same fan without a guide grille.
  • Acoustic disadvantages are minor because the air guide device, on the upstream side, is located in an area where the flow velocities are low. The tonal noise that occurs at the fan as a result of inhomogeneous inflow can be reduced because the guide grille evens out the inflow.
  • radially extending webs of a pre-guide grille are guide vanes, which, however, deviate from an exact radial orientation and/or are inclined, curved, rotated or twisted.
  • the guide vanes can have the shape of an airfoil profile in cross section.
  • These guide vanes can be connected to one another by crossbars to form a grid. This grid-like structure creates the previously mentioned pre-swirl, with the effect of increasing air performance and/or increasing efficiency with advantages or at most minor disadvantages in terms of acoustics.
  • Embodiments are conceivable that are particularly easy to manufacture. This is particularly the case when radial webs have a constant wall thickness and/or are straight or flat and/or their skeletal surfaces are aligned precisely in the axial direction. It is advantageous if the guide grille can be removed from an injection molding tool without a slider.
  • the pre-guiding grid is constructed similarly to an unstructured grid, for example a honeycomb grid, as long as it is designed in such a way that it generates the pre-swirl.
  • the pre-guide grid comprises many small webs which are arranged at a relatively large distance from the impeller, namely in accordance with the design and arrangement of the pre-guide device.
  • the guide grille is arranged in the flow path in front of an inlet nozzle.
  • the area flowed through can be significantly larger than the cross-sectional area flowed through in the area of the inlet to the fan impeller.
  • the air speeds in the area of the guide grille are low, which has an advantageous effect in terms of noise generation and flow losses.
  • the effect of the interaction of a so-called caster dent with the impeller blades is small.
  • the guide grille similar to a flow straightener, ensures a certain level of flow uniformity and thus leads to improvements in tonal noise, especially in disturbed inflow conditions - whatever the cause.
  • a pre-swirl is generated with a type of flow straightener.
  • the increase in air output or efficiency is combined with at best a slight acoustic deterioration or improvement in disturbed inflow conditions, which is due to the special design of the air guide device in the form of a pre-guide grille.
  • the shape or contour of the guide grille depends on whether the fan is a centrifugal fan or an axial fan. Especially with a centrifugal fan, it is an advantage if the guide grille is designed like a hood. If the fan is an axial fan, the guide grille could be designed like a circular ring, whereby the circular ring can be closed in the middle by a functional element. Specifically, an integral or separate flow hood can be provided, which adjoins the pre-guide grille or is attached to or in the pre-guide grille. The flow is then advantageously guided along a contour in the inner area (hub area).
  • the guide grille can be made of plastic in one piece or in several parts. It is preferably manufactured by injection molding. It advantageously has provisions that enable the pre-guiding grille to be attached, for example, to a nozzle plate.
  • the guide grille also takes on the function of a contact protection grille.
  • the fan can be used in any ventilation arrangement, for example in a housing, an air conditioning unit, an air conditioning or fan wall, etc.
  • a heat exchanger is preferably arranged on the suction side, regardless of what specific type of fan it is like.
  • the required air output can be achieved by using the guide grille with a lower stagger angle than without the guide grille. This means that the required air output is achieved with significantly higher efficiency.
  • Fig.1 shows a perspective view of a guide grille 1, which is particularly suitable for an in Figure 1 Centrifugal fan, not shown, is suitable.
  • the guide grille 1 is advantageously attached in front of the inlet area of an inlet nozzle. It comprises radial webs 2, which are connected to one another by transverse webs 3 to form a type of hood.
  • Fig. 9 shows a schematic view, in section along the longitudinal axis, of an inventive application of the guide grille 1 Fig. 1 , in combination with a centrifugal fan 6 with radial impeller 12, which is in Figure 9 is merely hinted at.
  • the arrangement is to be understood, for example, as an element of a fan wall, air conditioning wall or the like.
  • Fig. 9 is the guide grid 1 according to Fig. 1 shown in section with an inlet nozzle 9, which is integrated into a nozzle plate 10, and a fan 6 with impeller 12.
  • the fan 6 sucks in air through the guide grille 1 and then through the inlet nozzle 9 as a result of the rotation of the impeller 12.
  • the impeller 12 of the fan 6 energy is transferred to the air through its rotational movement, which drives the flow before it flows out of the impeller 12 again at the fan outlet.
  • the air Before entering the pre-guiding grille 1, the air has no or only a low speed component in the circumferential direction with respect to the fan axis, especially when viewed on a temporal and spatial average over the inflow area of the pre-guiding grille.
  • the webs are preferably made thin.
  • Typical wall thicknesses of the webs 2, 3 are 0.5 mm - 3 mm, whereby the manufacturability and strength of a guide grille 1 must be taken into account.
  • the webs 2, 3 have a certain height, viewed in the direction of flow, in order to be able to effectively reduce the fluctuations in air speeds. Typical heights in the flow direction are 8 mm to 30 mm.
  • Fig. 9 It is clearly visible that the guide grille is located in the flow path in front of the inlet nozzle and thus in front of a taper in the flow cross section.
  • the total flow cross section in the area of the pre-guide grille is significantly larger than the narrowest flow cross section in the inlet nozzle 9.
  • a factor of at least 2 is that the total flow cross section of the pre-guide grille is larger in relation to the narrowest flow cross section in the inlet nozzle.
  • the air velocities in the area of the feed grille are relatively low, which is advantageous for low noise and low pressure losses at the feed grille. This is particularly advantageous if the pre-guiding grid, as in the exemplary embodiment, is used to generate pre-swirl.
  • Fig. 13 is a comparable structure as in Fig. 9 shown, with only the impeller 12 and only the guide grille 1 of the fan 6 being shown in section.
  • the pre-guiding grille 1 is shown schematically by its skeletal surfaces 11, ie without wall thicknesses required for production purposes. These skeletal surfaces 11 correspond to the central surfaces of the wall-thickness webs 2, 3.
  • an air velocity vector v1 is indicated schematically at a point in the flow path in front of the guide grille. After passing through the guide grille, the air can have a different speed v2.
  • Fig. 13 Coordinate systems that are helpful for describing the invention are also shown.
  • the origin is the imaginary intersection of the fan axis with the plane of the nozzle plate 10. It is a Cartesian one Coordinate system with the coordinates (x, y, z) drawn in, where the z-axis lies on the fan axis.
  • a spherical coordinate system with the coordinates (r, ⁇ , ⁇ ), which are explained using any point P, is shown.
  • r describes the distance to the origin, ⁇ the angle between the radial ray projected onto the xy plane connecting P with the origin and the positive x-axis and 8 the angle between this radial ray and the z-axis.
  • the definition of such spherical coordinate systems is well known.
  • the r direction is called the radial direction
  • the ⁇ direction is called the circumferential direction (it corresponds to the direction of rotation around the z axis or the fan axis)
  • the 8 direction is called the polar direction.
  • Three-dimensional vectors, such as velocities or surface normals, can now be expressed in the form of three components, each representing the projection of the vector in the radial, circumferential and polar directions.
  • v1 and the components v1r, v1 ⁇ and v1 ⁇ generally depend on location and time.
  • the circumferential component v1 ⁇ in front of the pre-guiding grille 1 is zero or very small, at least on a spatial or temporal average.
  • a component v1 ⁇ of the inflow velocity v1, multiplied by the local center distance, is a measure of the swirl around the fan axis that the inflow has in front of the inlet grille.
  • the guide grille 1 creates a pre-swirl in the air flowing through.
  • the sign of v2 ⁇ describes the direction of rotation of the pre-swirl. According to the invention, this is opposite to the direction of rotation of the fan.
  • the amount of the component v2 ⁇ can be greater than 5% of the amount of the total speed v2 of the air, which then has a significant swirl around the fan axis before it enters the impeller 12.
  • a surface normal n is shown at one point, which can also be expressed in radial, circumferential and polar components (nr, n ⁇ , n ⁇ ). All surface normal vectors are assumed to be normalized to length 1 for further consideration.
  • v1 (v1r, v1 ⁇ , v1 ⁇ ) ⁇ (v1r,0,0).
  • the second condition is that flow deflection must take place in the circumferential direction, i.e. a reaction moment must arise in the circumferential direction, which is equivalent to a component in the circumferential direction n ⁇ of the normal vector n, which differs significantly in magnitude from 0, is advantageous
  • a normal vector must have a significant circumferential component.
  • both conditions must be fulfilled at the same time.
  • the pre-swirl generated is generally higher for a skeletal surface section under consideration, the higher the amount of the product nr*n(p is. This also means that the strength of the pre-swirl can be controlled with the geometric design of the pre-guide grid.
  • nr*n(p indicates the direction of rotation of the generated circumferential component v2 ⁇ , i.e. the pre-swirl, in the swirl-free inflow described (a positive sign means a direction of rotation of the pre-swirl in the positive direction of the coordinate ⁇ ).
  • the area average value [nr*n ⁇ ] of the ( signed) product nr*n(p over the entirety of the skeletal surfaces 11 of a pre-conducting grid differ significantly from zero. This is particularly the case if the amount of the area mean value [nr*nep] is greater than 0.01, advantageously greater than 0.05. This observation also takes into account the effect that opposing pre-swirl generation cancels out on average at different points on the pre-swirl grid, i.e. if different areas generating pre-swirl cancel each other out again on average, the area average value [nr*nep] will also be zero or close to zero .
  • Fig. 2 shows the guide grid 1 Fig. 1 in a front view.
  • This view shows that both the radial webs 2 and the transverse webs 3 are at least slightly rotated or inclined or tilted with respect to the longitudinal axis.
  • the normal vectors of the transverse webs 3 consistently have a circumferential component of zero, so in the exemplary embodiment the transverse webs 3 do not contribute to the generation of pre-swirl because the product nr*ncp is zero.
  • the associated normal vectors have a circumferential component of greater than 0.95, since the radial webs 2 are mainly aligned in the circumferential direction, but also have a component in the direction due to their clearly recognizable curvature Fig. 13 have defined ball radials, the average amount of which is approximately 0.07 over the radial webs 2. This results in an area average value [nr*nep] of approximately 0.07 for the radial webs and an area average value [nr*nep] of approximately 0.05 for the entire guide grille.
  • This pre-guide grille produces a rather low pre-swirl, in which, on average, after flow through the pre-guide grille, the magnitude of the peripheral speed is approximately 10% of the total speed.
  • Pre-guide grilles with low pre-swirl are characterized by particularly low noise generation at the fan impeller.
  • a low pre-swirl also has the advantage that fans designed for pre-swirl-free operation are optimally suited for such a pre-swirl grille.
  • a pre-swirl against the direction of rotation of a fan impeller is usually accompanied by an increase in air output, compared to pre-swirl-free operation of the same fan impeller.
  • the radial component nr of the local normal vector is still close to zero, so the skeletal surface there is still approximately parallel, i.e. without an angle of attack, to the inflow, which minimizes shock losses. Only through the curvature of the webs does the component nr of the normal vectors increase in magnitude, which then leads to a flow deflection in the circumferential direction.
  • a curved design of the pre-swirl generating surfaces is advantageous, but can be more difficult to manufacture than a non-curved design of webs 2, 3. As a result of the curved design, the webs can also be viewed as guide vanes.
  • pre-guiding grilles As already stated at the beginning, there are fans with pre-guide grilles in the prior art, although these do not produce any pre-swirl. From an aerodynamic point of view, such guide grilles are an obstacle in the flow path. The air output and efficiency decrease accordingly if such a pre-guide grille is provided. In contrast, the pre-guiding grille according to the invention generates a pre-swirl and thereby noticeably increases the air output. The efficiency can also be increased at least slightly.
  • a pre-guide grid 1 which does not produce any pre-swirl.
  • Such a guide grille can reduce spatial and temporal fluctuations in the inflow and thus reduce the noise generated by the fan.
  • the product nr*nep is equal to zero for all skeletal surfaces, and in particular the area mean value [nr*n ⁇ ] is also equal to zero.
  • the normal vectors of the radial webs 2 do not have a radial component nr at any point, as in Fig. 15 and Fig. 16 can be clearly seen, so they have no angle of attack to the inflow.
  • the normal vectors of the circumferential webs 3 do not have a circumferential component n ⁇ at any point, so they do not produce any Reaction torque in the circumferential direction and therefore no flow deflection in the circumferential direction.
  • Fig. 15 It can be clearly seen that the radial webs 2 are aligned exactly in the axial direction, which significantly facilitates demoulding in an injection molding tool.
  • FIG. 17 A pre-guiding grid 1 is shown, which generates pre-swirl on a spatial and temporal average, but does not have curved webs.
  • Fig. 18 It can be seen that the normal vectors of the skeletal surfaces of the radial webs 2 each have a component in the radial direction nr that is not equal to zero and a component in the circumferential direction n ⁇ that is not equal to zero.
  • the radial webs 2 are axially aligned ( Fig. 18 ), which is advantageous for the ability to be removed from an injection molding tool.
  • FIG. 19 A pre-guiding grid 1 is shown, which generates pre-swirl viewed on a spatial and temporal average and has curved radial webs 2.
  • Fig. 20 It can be seen that the normal vectors of the skeletal surfaces of the radial webs 2 each have a component in the radial direction nr that is not equal to zero and a component in the circumferential direction n ⁇ that is not equal to zero.
  • the curved design of the radial webs 2 makes it possible to minimize the flow losses at the pre-guide grille 1 while generating the same pre-swirl. Despite their curvature, the radial webs 2 are axially aligned ( Fig.
  • the radial webs 2 are not designed continuously from the outer radius of the pre-guiding grille to the inner radius of the pre-guiding grille. This is not necessary. A completely free design of the pre-guiding grille 1, similar to that of an unstructured grille, is also conceivable.
  • the crossbars 3 also do not have to be continuous. This would not change the criteria described for generating pre-swirl.
  • the guide grille 1 can be made in one piece or in several parts from plastic, preferably by injection molding. Crossing points of the radial webs 2 with the transverse webs 3 can be difficult to remove from the mold, particularly due to a curvature or inclination of the radial webs 2. For demolding without a slide in the tool, it may be necessary to provide local material filling or backfilling. It can also offer production from several parts or segments, provided that the guide grille does not have a load-bearing function. If, on the other hand, the guide grille takes on a supporting function, a one-piece, stable design of the guide grille is preferable. This also applies if the guide grille 1 is intended to take on the function of a contact protection grille.
  • a wide variety of devices can be provided on the feed grille 1 in order to attach them, for example, to an inlet nozzle 9 or a nozzle plate 10.
  • the guide grille 1 can also be designed in such a way that it simultaneously takes on the function of a contact protection grille.
  • Fig. 4 shows a perspective view from the front of a further exemplary embodiment of a guide grille 1 for an in Fig. 4 Axial fan, not shown.
  • Fig. 5 shows the guide grid 1 according to Figure 4 in a side rear view.
  • Fig. 6 shows the guide grid 1 from the Figures 4 and 5 in a front view.
  • Fig. 7 shows the guide grid 1 from the Figures 4 - 6 in section along the longitudinal axis and Figure 8 in section in a plane transverse to the longitudinal axis.
  • a guide grille 1 it is important that the flow is also guided in the hub area of the fan on an inner wall of a hub structure 5.
  • the flow guidance at the hub of the pre-guiding grille 1 or the pre-guiding device passes over to the impeller hub in terms of contour technology, as shown in the view Figures 10 , 11 and 12 show.
  • the hub structure 5 can be formed in one piece with the guide grille 1, or can form a separate part.
  • the blades 14 of the axial impeller 13 of the axial fan 7 are adjustable in their stagger angle. This option is very advantageous for using a pre-guiding grille 1 with pre-swirl generation. With a fixed stagger angle, the pre-guiding grille 1 in the exemplary embodiment increases the air output if it generates a pre-swirl counter to the direction of rotation of the fan impeller 13. If you adjust the stagger angle when using the guide grille in such a way that the same air output is achieved as without the guide grille, you can achieve this air output with significantly higher efficiency than before.
  • the flow hood 4 provided there can be designed as a separate component, which is attached to the actual guide grille 1.
  • the inlet nozzle 9 would run approximately parallel to the hub contour 5 when the entire fan is assembled. In this respect, let's look at it Figures 10 , 11 and 12 referred.
  • Fig. 8 shows a front view of the guide grille in section across the longitudinal axis.
  • the inclined radial webs 2 show that a massive flow deflection of the air flow in the circumferential direction takes place here.
  • the flow deflection takes place against the direction of rotation of the in Figure 8 impeller of the fan, not shown.
  • both the radial component nr and the circumferential component n ⁇ are relatively large (both in magnitude greater than 0.3 for the radial webs 2 at the cutting plane of Fig. 8 , i.e. the product nr*nep with an amount greater than 0.09, which is a very large value and represents a strong deflection).
  • the ratio of the amount of the circumferential speed before entering the fan to the amount of the total speed is, viewed on a temporal and spatial average, greater than 0.3.
  • the direction of rotation of the pre-swirl generated in this way is opposite to the direction of rotation of the fan impeller during operation. Due to the strong pre-swirl, the air output of the fan increases significantly; it can increase by over 50% compared to operating the fan without pre-swirl.
  • radial webs 3 in the exemplary embodiment do not have a constant thickness, but rather have a profile in cross section similar to that of an airfoil. This design enables an additional reduction in flow losses when flowing through the grille as well as an improvement in the aeroacoustic properties. However, it is difficult to produce plastic injection molding.
  • Fig. 10 shows the feed grille 1 in combination with an axial fan 7 with an axial impeller 13, which is also only indicated here. It can be clearly seen that the flow is also guided in the hub area. The flow guidance at the hub is transferred to the impeller hub in terms of contours. The flow hood 4 and the hub contour 5 are clearly visible. The direction of rotation of the pre-swirl generated by the pre-deflection grille is advantageously opposite to the direction of rotation of the axial impeller 13 in order to increase the air output.
  • the Fig. 11 and 12 each show the fan 7 with axial impeller 13 with the guide grille 1 Fig. 10 , with a heat exchanger 8 being arranged on the suction side.
  • the pre-guiding grille 1 ensures a better speed distribution of the air flow on the heat exchanger 8 arranged on the suction side. In particular, temporal and spatial fluctuations in the inflow velocities when flow through the pre-guiding grille 1 are reduced, which leads to a reduction in the tonal noise at the fan. At the same time, the air output is increased by the pre-swirl generation of the pre-guide grille 1.
  • Fig. 11 a square heat exchanger 8 is shown, through which the fan sucks the air parallel to the axial direction. After flow through the square heat exchanger 8, spatial and temporal irregularities (fluctuations) of the inflow arise. These fluctuations are reduced by the guide grid.
  • Fig. 12 a square heat exchanger 8 is shown, through which the fan sucks the air transversely to the axial direction. This creates particularly strong spatial and temporal irregularities (fluctuations) in the inflow, which in turn are reduced by the guide grille. This reduces the tonal noise generated by the fan.
  • pre-guide grilles described can be combined with all types of fans (axial fans, radial fans), provided the combination complies with claim 1.
  • a pre-deflection grille, pre-swirl i.e. a circumferential component of the flow, before entering the radial - or axial impeller to create.
  • This property can be attributed to certain geometric properties of the skeletal surfaces or their normal vector distributions of the guide grid as described.
  • the exact structure of the guide grilles can be done in a variety of ways. For example, a structure consisting of radial and circumferential webs does not necessarily have to be implemented; an alternative would be a structure similar to an unstructured grid or a honeycomb structure Structure conceivable.
  • the criteria for the normal vectors of the skeletal surfaces of the grid apply unchanged in such cases.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
EP18734423.9A 2017-06-01 2018-05-22 Ventilator und vorleitgitter für einen ventilator Active EP3631210B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SI201831087T SI3631210T1 (sl) 2017-06-01 2018-05-22 Ventilator in vodilna mrežica za ventilator

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017209291.2A DE102017209291A1 (de) 2017-06-01 2017-06-01 Ventilator und Vorleitgitter für einen Ventilator
PCT/DE2018/200053 WO2018219414A2 (de) 2017-06-01 2018-05-22 Ventilator und vorleitgitter für einen ventilator

Publications (2)

Publication Number Publication Date
EP3631210A2 EP3631210A2 (de) 2020-04-08
EP3631210B1 true EP3631210B1 (de) 2024-02-14

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JP (1) JP2020521911A (zh)
CN (1) CN110959075B (zh)
BR (1) BR112019024982B1 (zh)
DE (1) DE102017209291A1 (zh)
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CN110959075B (zh) 2022-06-21
US11255346B2 (en) 2022-02-22
BR112019024982A2 (pt) 2020-06-23
US20200116165A1 (en) 2020-04-16
RU2019144043A (ru) 2021-07-12
CN110959075A (zh) 2020-04-03
SI3631210T1 (sl) 2024-05-31
EP3631210A2 (de) 2020-04-08
DE102017209291A1 (de) 2018-12-06
WO2018219414A2 (de) 2018-12-06
JP2020521911A (ja) 2020-07-27
WO2018219414A3 (de) 2019-02-21
BR112019024982B1 (pt) 2024-02-27
RU2019144043A3 (zh) 2021-09-10

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