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EP3775571B1 - Ventilateur et grille d'admission pour ventilateur - Google Patents

Ventilateur et grille d'admission pour ventilateur Download PDF

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Publication number
EP3775571B1
EP3775571B1 EP19715390.1A EP19715390A EP3775571B1 EP 3775571 B1 EP3775571 B1 EP 3775571B1 EP 19715390 A EP19715390 A EP 19715390A EP 3775571 B1 EP3775571 B1 EP 3775571B1
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EP
European Patent Office
Prior art keywords
webs
inflow
fan
grille
region
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
EP19715390.1A
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German (de)
English (en)
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EP3775571A1 (fr
Inventor
Frieder Loercher
Alexander Herold
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Ziehl Abegg SE
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Ziehl Abegg SE
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Publication date
Application filed by Ziehl Abegg SE filed Critical Ziehl Abegg SE
Priority to SI201930866T priority Critical patent/SI3775571T1/sl
Publication of EP3775571A1 publication Critical patent/EP3775571A1/fr
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Publication of EP3775571B1 publication Critical patent/EP3775571B1/fr
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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
    • F04D29/42—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
    • F04D29/52—Casings; Connections of working fluid for axial pumps
    • F04D29/54—Fluid-guiding means, e.g. diffusers
    • F04D29/541—Specially adapted for elastic fluid pumps
    • 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
    • F04D29/70—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
    • F05D2210/00—Working fluids
    • F05D2210/10—Kind or type
    • F05D2210/12—Kind or type gaseous, i.e. compressible
    • 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

Definitions

  • the present invention relates to a fan (axial, radial or diagonal fan) with an impeller and a guide device in the flow path in front of the impeller, preferably in front of the inlet area of an inlet nozzle, wherein the guide device is designed as an inflow grille with flat webs and wherein the webs form a plurality of grid-cell-like flow channels. Furthermore, the invention relates to a special guide device which is designed in the sense of an inflow grille with flat webs.
  • a generic fan with inflow-side guide vane is, for example, made of WO 03/054395 A1 or from WO 2015/124237 A1 known.
  • the guide device provided there serves primarily to even out the flow, and in particular to reduce noise.
  • the known guide device generates a pre-swirl in the direction of rotation of the impeller. It is important to note that acoustic improvements are regularly accompanied by losses in air performance and efficiency.
  • the guide device provided there is also very complex to manufacture.
  • guide vanes are already known from practice, which serve to improve efficiency and/or air performance.
  • these guide vanes have acoustic disadvantages and are complicated to construct and install in the respective fan products. They are usually installed in front of fan impellers in a cylindrical installation space with a diameter approximately the same as the fan impeller and therefore do not have a significantly larger flow area than the fan. As a result, the air speeds in the area of these guide vanes are relatively high, which in particular causes the acoustic disadvantages.
  • the invention is based on the following technical problem.
  • the present invention is therefore based on the task of designing and developing a fan in such a way that noise is reduced in the event of a disturbed inflow.
  • the fan should be compact and have only extremely low pressure losses.
  • a guide device in particular an inflow grille or guide grille, should be specified which meets the above requirements and which can be manufactured using plastic injection molding with economical tooling. It should be dimensionally stable and be able to advantageously take on the function of an upstream contact protection grille.
  • the webs extend predominantly between preferably two branches or between one branch in each edge area. Preferably three webs meet at each branch.
  • the underlying independent claims are the basic idea of providing an inflow grille or inlet grille in front of the inlet nozzle of a fan in order to reduce the noise generated when the fan is operating in the event of a disruption to the inflow.
  • the inflow grille is defined by flat webs, whereby the webs are arranged in such a way that grid-cell-like flow channels are created.
  • advantageous geometries can be realized, for example in that the flow channels have a honeycomb-like cross-section.
  • honeycomb-like is to be understood in the broadest sense, so that it also includes polygons, for example grid cells with a square, five-sided or hexagonal or polygonal cross-section.
  • the inflow grille has a basket-like contour, whereby the contour can refer to both the outer and the inner envelope surface of the inflow grille.
  • An inflow grille of the type mentioned above is suitable for the radial inflow in the area close to the nozzle plate.
  • the flow channels have a beneficial effect on low pressure losses.
  • the basket-like outer contour is also advantageous for demoldability in the context of an injection molding technique that is used primarily for plastic parts.
  • compact grilles with the corresponding properties can be produced.
  • the basket-like outer contour is particularly advantageous if it is continuous and curved.
  • the grid webs should be as thin as possible, for example in the range of 0.25 mm to 1 mm web thickness. In the direction of flow they should have a depth of at least 5 mm (hence the term "flat web” chosen in the claims).
  • the grid bars form a non-structured grid in which honeycomb-like grid cells are combined with one another.
  • the grid cells can be polygonal and combined with one another or with one another. This allows minimal obstruction by grid bars to be achieved, particularly when a certain maximum grid width is necessary due to the required noise reduction or taking into account contact protection aspects, which leads to low pressure and efficiency losses.
  • the inlet grille advantageously extends over the entire area up to the imaginary extension of the fan axis, so it has no or no particularly large opening in the inner area.
  • a central opening is not necessary, and can even be avoided, provided the inlet grille also provides protection against contact. It has also been found that a central opening is detrimental to minimizing noise and improving the stability of the grille.
  • the special design of the inflow grille is particularly advantageous, not only in terms of the grid-like flow channels, but also in terms of the continuous and curved outer contour.
  • Honeycomb elements with 4, 5 or 6 corners allow unstructured grilles to be created, with variable grille widths being possible across the entire inflow grille, depending on requirements.
  • the inlet grille according to the invention is intended for use in an axial, radial or diagonal fan and is constructed in accordance with the above statements.
  • Fig.1 shows an embodiment of an inflow grille 1 in a perspective view from the front, ie seen from the inflow side.
  • the inflow grille 1 is similar to the illustration in Fig. 17 advantageously mounted in front of the inlet nozzle 2 of a fan so that its axis roughly coincides with the rotation axis of the fan.
  • the air first flows through the inlet grille 1 into the inlet nozzle 2 before it experiences a total pressure increase as it flows through an impeller 3 of the fan, which is driven by a motor 4.
  • the inlet grille 1 evens out the incoming air, thereby reducing the noise generated in the impeller.
  • the inlet grille 1 consists of a large number of webs 5 which define grille cells 6.
  • the grille cells 6 are flowed through when the fan is operating, i.e. they form flow channels.
  • the incoming air has a lower speed in an area in front of an inlet nozzle 2 than inside an inlet nozzle 2, since the area flowed through by the air mass flow conveyed by the fan is larger in an area in front of an inlet nozzle 2 than in an inlet nozzle 2.
  • the inlet grille 1 is used in such an area of relatively low flow speeds, i.e. the flow speed at the inlet grille 1 is lower than the flow speed in the inlet nozzle 2. This keeps flow losses and noise generation at the inlet grille 1 to a minimum.
  • the inflow in an area in front of an inlet nozzle 2 is not flat or not predominantly parallel to the axis, it is of great advantage not to make the contour of the inflow grille 1 completely flat.
  • the contour can be described by the outer envelope surface 7 and/or the inner envelope surface 8 ( Fig. 2 ) of the inflow grille 1.
  • These envelope surfaces 7, 8 are defined by the totality of the inflow and outflow end faces 7a and 8a of the webs 5 (see Fig. 1a ), supplemented by imaginary continuous or curvature-continuous completions in the area of the flow channels 6.
  • Fig. 1a shows a detailed, enlarged view of a section of the inlet grille 1 from Fig.1 .
  • the webs 5 have a significant depth t (9) in the direction of flow, advantageously around 6-20 mm. For this reason, the webs 5 are also referred to as "flat" webs.
  • a grid cell 6 is also characterized by a cell width w (12), for example defined by the radius of the largest in-sphere of the cell 6.
  • a small grid width w (12) is advantageous, for example a value of w (12) of no more than two to three times the web depth t (12) for the majority of the cells 6 of an inflow grid 1.
  • the inflow grid 1 in the embodiment according to Fig.1 also represents a contact protection device which, in accordance with regulations and standards, must comply with requirements for the cell width w (12) depending on the cell shape and the distance of the cell 6 from a rotating part of the fan. This additionally limits the size of the cell width w (12) upwards.
  • the web lengths I are determined based on the neutral fibers 13, advantageously on the outer or inner envelope surface 7 or 8).
  • An "unstructured" grid structure with honeycomb-like cells 6 as in the exemplary embodiment can be very advantageous for the required total web length under the described conditions for the maximum grid width w (12).
  • the inlet grille 1 is according to Fig.1 shown in a perspective view from the downstream side.
  • the inlet grille 1 has fastening areas 18 on the outside, which serve to attach the inlet grille 1 to the inlet nozzle 2 or the nozzle plate 32 ( Fig. 17 ) to be attached.
  • fastening areas 18 There are various options for designing the fastening areas 18. Possible fastenings are screws, rivets, snap hooks, bayonet locks, gluing, snapping, Velcro or others. In the example, a screw hole is provided on each of the four fastening areas 18.
  • the basket-like contour of the inner envelope surface 8 of the inflow grille 1 is clearly visible.
  • This contour extends along the outer circumference for a certain distance, preferably more than 10 mm or more than 8% of the outer diameter D (20) ( Fig.5 ), approximately parallel to the imaginary central axis, approximately on a cylinder jacket (cylinder jacket-like region 34).
  • the cells 19 of the outer row are located in this cylinder jacket-like region 34, two adjacent cells of which are separated from one another by a web 35 of the outer row.
  • the cells 19 of the outer row have a rather elongated shape.
  • the cell widths w (in-sphere radii, for the cells 19 of the outer row essentially determined by the distance between two adjacent webs 35 of the outer row) of these cells are rather smaller than the in-sphere radii of the other cells 6.
  • the contour is flat or flat, approximately orthogonal to the axis (flat region 33).
  • the transition from the flat region 33 to the cylinder jacket-like region 34 takes place via a short transition region 24, which is curved in the exemplary embodiment.
  • the outer envelope surface 7 and the inner envelope surface 8 run approximately parallel. The division of the regions 33, 34, 24 can be carried out based on the outer and/or inner envelope surface 7 or 8.
  • the inlet grille 1 is according to Fig.1 and 2 in axial plan view from the front (seen from the inflow side).
  • Such an inflow grille 1 is advantageously manufactured using plastic injection molding. It is also advantageous to view the grille from Fig.3 also to be chosen as the demolding direction for an injection molding tool in order to keep the tool complexity low.
  • one tool part then moves relative to the inflow grille 1 towards the viewer, advantageously the nozzle side of the tool, and another tool part moves away from the viewer.
  • the injection molding tool advantageously has no further slides for the sake of ease of manufacture.
  • the webs can also advantageously have a curvature in order to optimally guide the flow.
  • a web 29 is marked, which is an axially aligned web, i.e. it is aligned parallel to the axis (viewing and slide direction), which makes it easier to demold it.
  • Axially aligned webs 29 are advantageously provided with a demolding slope.
  • a suitable, more elastic material is selected, small undercuts can be created and still demolded in the axial direction with a simple open-close tool. This makes it easy and economical to create a contour that is particularly optimized in terms of flow.
  • the cells in the area near the axis are smaller than those in the area away from the axis.
  • the cell size or cell width w (12, see Fig.2 ) is optimized in each case with regard to the requirements regarding compliance the contact protection regulations and with regard to the acoustic improvements or flow equalization to be achieved.
  • the distribution of the cells is optimized using a special algorithm.
  • a wide variety of cell contours occur (when viewed on one of the envelope surfaces 7 or 8), in particular, but not exclusively, regular and irregular 4-6 corners.
  • each cell when viewed on an envelope surface 7 or 8) describes a range of points which are those that are closest to an imaginary central point (on the envelope surface) compared to the imaginary central points of all other cells.
  • the structure of the grid 1 is therefore also characterized by the fact that in the majority of branching areas 15 exactly 3 webs 5 meet, in far fewer branching areas 4 webs 5 meet. Furthermore, there are no relatively small cells at the edge with a flow area of less than 50% with respect to the flow area of one of their neighboring cells, which are caused by an effect of "cutting through outer cells with the edge".
  • the inlet grille 1 is made of Fig. 1 to 3 shown in axial plan view from behind (seen from the downstream side).
  • the webs 35 of the outer row which are aligned in the axial direction, have a free end 14. This allows them to be demolded by a tool slide which moves in the direction of the downstream side (towards the viewer) when opened.
  • the fact that the ends 14 of the outer webs 35 are not connected is disadvantageous in terms of strength and dimensional stability, but can be compensated for by using a high-quality material or by using large wall thicknesses d (10).
  • the segments can have slight differences from one another, for example in the area of the fastening provisions, if their number does not correspond to the number of segments. corresponds, or in an inner area close to the axis, in which segmentation may be more difficult under certain circumstances.
  • segmentation can be used advantageously to assemble inlet grilles 1 from several injection-molded segments, e.g. by clipping, locking, screwing, gluing, by fastening to the nozzle plate, or the like.
  • segmentation can be used advantageously to assemble inlet grilles 1 from several injection-molded segments, e.g. by clipping, locking, screwing, gluing, by fastening to the nozzle plate, or the like.
  • the central part can, however, be of a simple design, in particular even or flat.
  • Fig.5 shows the inlet grille 1 according to the Fig. 1 to 4 in a side view and in section on a plane through the axis.
  • the course of the basket-like contour of the inflow-side and outflow-side envelope surfaces 7 and 8 is clearly visible.
  • the outer envelope surface 7 has an outer diameter D (20), which is also referred to as the diameter D (20) of the inflow grille 1, whereby the diameter of the fastening areas 18 is not taken into account here.
  • the outer envelope surface 7 and inner envelope surface 8 run approximately parallel to one another in the exemplary embodiment.
  • the distance between the envelope surfaces 7 and 8 is advantageously 6 mm to 18 mm or is approximately 3%-10% of the diameter D (20) of the inflow grille 1.
  • the contour runs approximately parallel to the axis for a distance (cylinder jacket-like part 34).
  • the transition region 24 has a small extension in the radial direction of less than 12.5% of the outer diameter D (20).
  • the flat region 33 has a diameter DE (21) which is advantageously relatively large and has at least 75% of the value of the outer diameter D (20).
  • the inflow grille 1 has an axial height H (22), with the cylinder jacket-like region on the outer envelope surface 7 has an axial extension of HZ(23). HZ (23) is advantageously larger than 6% of the diameter D (20).
  • the basket-like contour of the inflow grille 1 or its envelope surfaces 7, 8 is well adapted in terms of flow conditions.
  • air is expected to flow in more in a radial direction from the nozzle plate 32, which, due to the cylinder jacket-like shape of the grille 1 in this area 34, can pass through it approximately transversely to the envelope surfaces 7, 8 over a short path and thus with low flow losses.
  • an axial inflow is expected, which then also flows through the grille 1 over a short path transversely to the envelope surfaces 7, 8.
  • the compactly designed transition area 24 with a small extension enables a low installation height H (22) to be achieved, which is advantageous for a small space requirement of the inflow grille 1.
  • the axial installation height H (22) is advantageously no greater than 25% of D (20).
  • the targeted alignment of the webs can be clearly seen, which do not always run exactly perpendicular to the envelope surfaces, but are sometimes significantly different from this and optimally adapted to the exact inflow direction.
  • the webs 5 are not curved in the flow direction. However, this is certainly conceivable in other embodiments.
  • the outer ends 14 are open, i.e. not connected to one another (except at the fastening areas 18).
  • Fig.6 shows another embodiment of an inflow grille 1 in a perspective view from the front (from the inflow side).
  • the outer ends 14 of the webs 35 of the outer row are connected via an outer connecting ring 25.
  • This increases the dimensional stability of the outer webs 35, which can be advantageous with regard to compliance with the requirements for contact protection, especially when softer or more elastic materials are used.
  • the outer connecting ring 25 can also be advantageous for the filling behavior of an injection molding tool.
  • the connecting ring 25 is connected to the webs 35 by means of a connection 27. This connection is designed as an extension area the outer webs 35 are designed in the form of a curve with a large curve radius > 3 mm.
  • the fastening areas 18 are integrated into the connecting ring 25.
  • the connecting ring 25 lies in a plane that represents the screw-on plane toward the nozzle 2 or the nozzle plate 32.
  • the connecting ring 25 can run away from the fastening areas 35 and axially offset from the screw-on plane. This creates space between the nozzle 2 or the nozzle plate 32 and the connecting ring 25 when assembled. The presence of such space can be necessary for existing screw heads with which, for example, the nozzle 2 and the nozzle plate 32 can be screwed together, or in order to be able to position pressure extraction devices.
  • the connecting ring runs axially offset from the screw-on plane in areas, some or all of the webs 35 of the outer row can protrude beyond this toward the nozzle 2 or the nozzle plate 32, or end at the connecting web 25 when viewed in the axial direction. Additional webs can also be attached in the area between the connecting web and the screw-on plane.
  • the connecting ring 25 is interrupted in some areas and thus individual outer ribs 35 with open outer ends 14 are present. These outer ribs 35 with open outer ends 14 can also be shortened so that the outer ends 14 are at a distance from the screw-on plane. This can also serve to create space for screw heads, pressure tapping devices or the like between the screw-on plane and the inflow grille 1 in the assembled state.
  • FIG.7 the inlet grille 1 is according to Fig.6 in axial plan view from behind (seen from the downstream side).
  • the connecting ring 25 is located radially completely outside all webs 5, with the exception of the axially aligned webs 35 of the outer row with their connections 27 to the connecting ring 25.
  • This is particularly advantageous for the demoldability of the grid 1 from a simple open-close injection molding tool. Examples are shown in Fig.7 four identical cells 26 of the grid 1, which is made up of four identical segments. Since the number of different cells is greatly reduced by such segmentation, the effort involved in the construction of the grille 1 and especially the associated injection molding tool.
  • Fig.8 shows an inflow grille 1 in a perspective view from the front (from the inflow side).
  • the cells 6 and the webs 5 are neither arranged in a honeycomb-like manner nor unstructured, but rather radially extending webs 5 are formed that run over the circumference.
  • Four radially extending webs 5 meet in the central axis area at a central branching point 16.
  • the number of webs 5 that meet per branching area 15 is mainly 4.
  • the inflow grille 1 has a basket-like contour of the outer envelope surface 7. In this embodiment, no transition area is formed between the flat area 33 and the cylinder jacket-like area 34, but rather a "bend" that separates or connects these two areas.
  • the webs 5a and 5b shown as examples have a large undercut area 17 with respect to a demolding direction parallel to the axis. Due to this large undercut area, demolding from a simple open-close injection molding tool parallel to the axis direction is not conceivable. Demolding is conceivable with slides that demold radially outwards in a star shape, which form the part of the grid 1 corresponding to the cylinder jacket-like part 34.
  • Fig.9 the inlet grille 1 is according to Fig.8 shown in perspective view from behind (seen from the downstream side).
  • the basket-like contour of the inner envelope surface 8 is clearly visible.
  • Fig.10 the inlet grille 1 is in accordance with Fig.8 and 9 shown in axial plan view from the front (seen from the inflow side).
  • Four identical cells 26 of the four-segmentation are shown as examples.
  • the inlet grille 1 is in accordance with Fig. 8 to 10 shown in a side view and in section on a plane through the axis.
  • the diameter D (20) of the grille 1 and the diameter DE (21) of the flat or level area 33 correspond, since no transition area is formed.
  • the axial height H (22) of the grille 1 is slightly greater than the axial height HZ (23) of the cylindrical part, since the fastening areas 18 protrude axially to the right (towards the screw-on plane) beyond the grille. This means that in the assembled state, away from the fastening areas, there is a small distance between the nozzle 2 or the nozzle plate 32 and the grille 1 or the webs 35 of the outer row.
  • This distance provides space, for example, for screw heads of screws that connect the nozzle 2 and the nozzle plate 32, or space for pressure tapping devices in the radius of the inlet nozzle 2.
  • a similar design, according to which space is created between at least some outer grid webs 35 or also an outer connecting ring 25 and the nozzle 2 or the nozzle plate 32, is also possible for embodiments with unstructured grids similar to the Fig.1 until 7 and 12 until 16 conceivable. It is also conceivable in embodiments with unstructured grids that no transition areas are formed between the cylinder jacket-shaped area 34 and the flat or level area 33 of the inflow grid, but rather that they meet at a bend.
  • FIG. 12 another embodiment of an inflow grille 1 according to the invention is shown in a side view and in section on a plane through the axis.
  • the webs 5 in the exemplary embodiment are partially curved when viewed in section. This allows an even better adaptation of the grille 1 or the webs 5 to the inflow.
  • advantages in terms of demoldability can be achieved with fixed, flow-favorable surface angles of the webs 5 on the inflow side (outer envelope surface 7).
  • curved webs 5 a targeted, low-loss deflection of the inflow can be achieved if required. Any curvature (direction, amount) is conceivable.
  • Curved webs 5 can also be axially aligned webs at the same time. For example, webs 35 of the outer row in particular can also be curved and axially aligned in this way.
  • Fig. 13 shows a further embodiment of an inflow grille 1 according to the invention in a perspective view from the front (from the inflow side).
  • the grille 1 is constructed in an unstructured manner, so that in the majority of cases 3 webs 5 meet at the branching areas 15.
  • An outer connecting ring 25 is formed, via which the webs 35 of the outer row are connected to one another.
  • the connections 27 of the outer webs 35 to the connecting ring 27 are designed as rounded areas with relatively large rounding radii in extension of the webs themselves.
  • the connections 27 advantageously extend in the radial direction over a large part of the radial extent of the connecting ring 25 (over more than half of this area).
  • Four fastening areas 18 are integrated into the course of the connecting ring 25.
  • outer webs 35b which are located approximately centrally on the fastening areas 18 in the circumferential direction, are reduced in external diameter in order to gain access to the screw connection of the inflow grille to the fastening areas 18.
  • These outer webs 35b, which are reduced in external diameter, are advantageously extended inwards in diameter in order to have the necessary stability and the necessary cross-section for the injection molding process (see also the web 35b of the outer row in the area of a fastening area 18 in Fig. 16 ).
  • central injection area 28 is formed.
  • the liquid plastic is injected centrally into this injection area 28 and is then distributed over this disk-like area into the webs 5.
  • the innermost webs 5 have an inner end 31 at which they are connected to the central injection area 28.
  • Fig. 14 the inlet grille 1 is according to Fig. 13 shown in an axial plan view from the front (seen from the inflow side).
  • This embodiment is designed to be completely free of undercuts with regard to demoulding in the axial direction. This makes tool production significantly easier and guarantees a reliable injection moulding process with short cycle times.
  • Two webs 5a and 5b are shown as an example, the position of which is coordinated with one another in such a way that they do not overlap one another, seen in this axial plan view. To achieve this, A close interaction of the course of the envelope surfaces 7 and 8, the choice of the web depths t (9), the position and the alignment of the webs must be observed, taking into account compliance with the contact protection regulations.
  • axially aligned webs 29 prevents two axially non-aligned webs 30 from meeting at a branching area 15, the wall normal vectors of which, aligned in the same cell 6, have x components (axis-parallel components) with different signs.
  • two axially non-aligned webs 30 often meet one axially aligned web 29, or three axially aligned webs 29.
  • Other combinations occur less frequently.
  • Axially aligned webs 29 are advantageously designed with draft angles in order to facilitate their demolding from an injection mold. In an injection mold, both sides of an axially aligned web are formed by the same tool part. The property "axially aligned" applies strictly speaking to a middle surface between the two sides of an axially aligned web 29.
  • all webs 5 are designed as axially aligned webs 29.
  • the tool can be designed in such a way that in the corresponding inner cells 6 with exclusively or predominantly axially aligned webs 29, no tool parting line runs diagonally through the cells, but the complete contour of the cells can be introduced into a tool part. This further facilitates tool production. Due to the axial inflow In the inner area close to the axis, this can be easily achieved without any major loss of efficiency or acoustics.
  • the embodiment according to Figure 14 is made up of 12 identical segments, whereby the 12-fold rotational symmetry is locally interrupted by only 4 fastening areas 18.
  • the number of different cells 6 is significantly reduced by segmentation with a high number of segments.
  • the inflow grille 1 has a total of 312 cells 6, but due to the segmentation there are only 26 differently designed cells 6.
  • Embodiments with 8 segments are also particularly advantageous.
  • segmentation can also be used to produce an inflow grille 1 according to the invention in several parts, in particular in the case of larger outer diameters.
  • Fig. 15 shows the embodiment according to Fig. 13 and 14 in a side view.
  • the connection areas 27 of the outer webs 35 to the outer connecting ring 25 can be clearly seen.
  • the connection area 27, which is designed here as a rounded area, can also be designed in a different way, for example as a chamfer.
  • Fig. 16 is the embodiment according to Fig. 13 to 15 shown in a side view and in section on a plane through the axis.
  • the exemplary webs 5a and 5b do not overlap when viewed in the axial direction.
  • the connecting ring 25 does not overlap the web 5a when viewed in the axial direction. All of this is advantageous for a simple design of the injection molding tool, since undercuts between the webs 5a and 5b and the connecting ring 25 are avoided with regard to demolding parallel to the axial direction.
  • the webs 35b of the outer row which are located in the area of the fastening areas 18, are adapted to the screws with which the inlet grille 1 is screwed to an inlet nozzle 2 or to a nozzle plate 32, and their outer diameter is reduced for better accessibility.
  • these webs 35b are also at least slightly offset inwards in diameter.
  • the central injection area 28 can be clearly seen in the section.
  • the liquid plastic injected centrally in this area can be distributed well over the inner ends 31 onto the webs 5.
  • the inner ends 31 are advantageously rounded with the central injection area 28 or provided with a chamfer.
  • Fig. 17 shows an example of a fan with an inlet grille 1, a nozzle 2 which is attached to a nozzle plate 32, and a fan impeller 3 which is driven by a schematically shown motor.
  • the air first flows through the inlet grille 1 into the inlet nozzle 2 before it experiences a total pressure increase as it flows through the rotating impeller 3 of the fan. Turbulence in the inflow causes increased noise in the fan.
  • An inlet grille 1 according to the invention evens out the inflow and thus reduces the noise.
  • the inlet grille 1 also takes on the function of a suction-side contact guard. The pressure loss which occurs when the air flows through the grille 1 is minimized by the advantageous design according to the invention.
  • a diagonal fan 3 is shown in the exemplary embodiment.
  • the inlet grille 1 can just as easily be used with a radial or axial fan.

Landscapes

  • 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)

Claims (10)

  1. Ventilateur axial, radial ou diagonal, avec une turbine et un dispositif de guidage dans le trajet d'écoulement avant la zone d'entrée d'une buse d'entrée, dans lequel le dispositif de guidage est conçu comme une grille d'entrée (1) avec des entretoises plates (5), dans lequel les entretoises (5) forment une pluralité de cellules (6) avec des canaux d'écoulement en formes de cellules de grille, dans lequel les cellules (6) présentent au moins partiellement une section transversale en forme d'alvéole,
    dans lequel les cellules (6), du fait de leurs différents contours de cellules, sont constituées de quadrilatères et/ou de pentagones et/ou d'hexagones réguliers et/ou irréguliers,
    caractérisé en ce que les entretoises comprennent des entretoises alignées axialement et des entretoises non alignées axialement, dans lequel, dans au moins une zone d'embranchement, deux entretoises non alignées axialement rencontrent au moins une entretoise alignée axialement.
  2. Ventilateur (ventilateur axial, radial ou diagonal) selon la revendication 1, caractérisé en ce que les cellules (6) sont plus petites, dans la zone proche de l'axe, que celles dans la zone éloignée de l'axe.
  3. Ventilateur axial, radial ou diagonal avec une turbine et un dispositif de guidage dans le trajet d'écoulement avant la turbine, de préférence avant la zone d'entrée d'une buse d'entrée, dans lequel le dispositif de guidage est conçu comme une grille d'entrée (1) avec des entretoises plates (5), dans lequel les entretoises (5) forment une pluralité de canaux d'écoulement en formes de cellules de grille (6) et dans lequel la grille d'entrée présente un contour en forme de corbeille (surface d'enveloppe externe et/ou interne), qui comprend une partie externe en forme d'enveloppe cylindrique (34) et une partie plate proche de l'axe (33),
    caractérisé en ce que les entretoises comprennent des entretoises alignées axialement et des entretoises non alignées axialement, dans lequel, dans au moins une zone d'embranchement, deux entretoises non alignées axialement rencontrent au moins une entretoise alignée axialement.
  4. Ventilateur selon l'une des revendications 1 à 3, caractérisé en ce que, au centre de la grille d'entrée (1), est formée une zone libre d'entretoises (5), c'est-à-dire sans canaux d'écoulement (6).
  5. Ventilateur selon l'une des revendications 1 à 4, caractérisé en ce que les entretoises (5) présentent une épaisseur d'entretoise de l'ordre de 0,25 mm à 2 mm.
  6. Ventilateur selon l'une des revendications 1 à 5, caractérisé en ce qu'une zone proche de l'axe du contour s'étend de manière plane ou très plate, de manière approximativement orthogonale par rapport à l'axe central.
  7. Ventilateur selon l'une des revendications 1 à 6, caractérisé en ce qu'une zone de bord externe du contour interne s'étend de manière approximativement parallèle à l'axe central, à peu près sur une enveloppe cylindrique imaginaire.
  8. Ventilateur selon l'une des revendications 1 à 7, caractérisé en ce que la grille d'entrée (1) comprend, sur une zone de bord externe, de préférence sur certaines des entretoises (5) des moyens de fixation intégrés, qui permettent de les fixer par complémentarité de forme et/ou par force sur la buse d'entrée (2) ou sur la plaque de buse (32) du ventilateur.
  9. Ventilateur selon l'une des revendications 1 à 8, caractérisé en ce que, sur la zone de bord de la grille d'entrée (1), est prévu une bague de stabilisation qui comprend de préférence des moyens de fixation qui permettent de les fixer par complémentarité de forme et/ou par force sur la buse d'entrée (2) ou sur la plaque de buse (32) du ventilateur.
  10. Grille d'entrée avec les caractéristiques selon l'une des revendications 1 à 9.
EP19715390.1A 2018-04-09 2019-02-15 Ventilateur et grille d'admission pour ventilateur Active EP3775571B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SI201930866T SI3775571T1 (sl) 2018-04-09 2019-02-15 Ventilator in dotočna mreža za ventilator

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018205300.6A DE102018205300A1 (de) 2018-04-09 2018-04-09 Ventilator und Einströmgitter für einen Ventilator
PCT/DE2019/200013 WO2019196992A1 (fr) 2018-04-09 2019-02-15 Ventilateur et grille d'admission pour ventilateur

Publications (2)

Publication Number Publication Date
EP3775571A1 EP3775571A1 (fr) 2021-02-17
EP3775571B1 true EP3775571B1 (fr) 2024-09-25

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US (1) US11703065B2 (fr)
EP (1) EP3775571B1 (fr)
JP (2) JP2021519885A (fr)
KR (1) KR102795830B1 (fr)
CN (1) CN112262261B (fr)
DE (1) DE102018205300A1 (fr)
ES (1) ES3001091T3 (fr)
SI (1) SI3775571T1 (fr)
WO (1) WO2019196992A1 (fr)

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Also Published As

Publication number Publication date
SI3775571T1 (sl) 2025-03-31
ES3001091T3 (es) 2025-03-04
KR20200141079A (ko) 2020-12-17
KR102795830B1 (ko) 2025-04-16
BR112020020491A2 (pt) 2021-01-12
EP3775571A1 (fr) 2021-02-17
JP2021519885A (ja) 2021-08-12
US20210164495A1 (en) 2021-06-03
CN112262261A (zh) 2021-01-22
DE102018205300A1 (de) 2019-10-10
WO2019196992A1 (fr) 2019-10-17
JP2023169380A (ja) 2023-11-29
CN112262261B (zh) 2024-01-02
US11703065B2 (en) 2023-07-18

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