EP4090852A1 - Module de support conçu pour un ventilateur et ventilateur équipé d'un module de support correspondant - Google Patents

Module de support conçu pour un ventilateur et ventilateur équipé d'un module de support correspondant

Info

Publication number
EP4090852A1
EP4090852A1 EP20859651.0A EP20859651A EP4090852A1 EP 4090852 A1 EP4090852 A1 EP 4090852A1 EP 20859651 A EP20859651 A EP 20859651A EP 4090852 A1 EP4090852 A1 EP 4090852A1
Authority
EP
European Patent Office
Prior art keywords
support module
fan
struts
module according
impeller
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.)
Pending
Application number
EP20859651.0A
Other languages
German (de)
English (en)
Inventor
Frieder Loercher
Sandra Hub
Matthias GOELLER
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.)
Ziehl Abegg SE
Original Assignee
Ziehl Abegg SE
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Ziehl Abegg SE filed Critical Ziehl Abegg SE
Publication of EP4090852A1 publication Critical patent/EP4090852A1/fr
Pending legal-status Critical Current

Links

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
    • F04D25/00—Pumping installations or systems
    • F04D25/02—Units comprising pumps and their driving means
    • F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D25/00—Pumping installations or systems
    • F04D25/02—Units comprising pumps and their driving means
    • F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
    • 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
    • F04D29/02—Selection of particular materials
    • F04D29/023—Selection of particular materials especially 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
    • F04D29/40—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
    • F04D29/4226—Fan casings
    • 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
    • F04D29/4226—Fan casings
    • F04D29/4233—Fan casings with volutes extending mainly in axial or radially inward direction
    • 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
    • F04D29/4226—Fan casings
    • F04D29/4246—Fan casings comprising more than one outlet
    • 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
    • F04D29/60—Mounting; Assembling; Disassembling
    • F04D29/62—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps
    • F04D29/624—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
    • F04D29/626—Mounting or removal of 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
    • F04D29/66—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
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2230/00—Manufacture
    • F05D2230/50—Building or constructing in particular ways
    • F05D2230/54—Building or constructing in particular ways by sheet metal manufacturing
    • 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
    • F05D2250/52—Outlet
    • 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
    • F05D2250/70—Shape
    • F05D2250/71—Shape curved

Definitions

  • the invention relates to a support module for a fan which comprises a motor and a fan impeller driven in rotation by the motor, in particular for a radial or diagonal fan, for fastening the fan impeller between an inflow-side nozzle plate and a base plate which is at a distance from the nozzle plate, the motor with the fan impeller rotatably mounted on or in the base plate and is held by means of struts extending between the base plate and the nozzle plate on the nozzle plate.
  • the invention also relates to a fan with a corresponding support module.
  • this is a support device which is used to attach a motor with a fan impeller, the motor and the fan impeller being regularly attached to a base plate of the support device. While the motor is rotatably mounted on its stator on the support device, the fan impeller rotates with the rotor of the motor.
  • the arrangement of the base plate of the support device with the motor and fan impeller is mechanically connected to the nozzle plate usually comprising an inlet nozzle and, in other words, is held on the nozzle plate. Struts that extend between the base plate and the nozzle plate are regularly used for this purpose. These are fastening means in the broadest sense, which space the nozzle plate away from the base plate and stabilize the arrangement with the fan impeller located in between. Due to the provision of the struts, the arrangement of the components discussed above is to be understood as a structural unit.
  • the support devices known from practice which accomplish the attachment of radial or diagonal fan impellers to the nozzle plate, are problematic in that the connecting struts are downstream of the air outlet run and due to their precautions cause efficiency losses, air performance losses and / or an increase in noise; at least, however, does not increase the static efficiency.
  • the arrangement known from practice often requires a not inconsiderable installation space, far from being compact.
  • Fans with known support devices have a pronounced, disruptive subharmonic noise, especially at operating points of high static pressure increases, since known support devices do not stabilize the flow downstream of the impeller.
  • the present invention is therefore based on the object of at least reducing the aforementioned disadvantages.
  • the known support device is to be optimized into a support module through the special design of its struts and possibly also the motor support plate or base plate in such a way that the losses and the increase in noise are minimal, with an increase in the efficiency and air output as possible being achieved.
  • the support function of the support module, in particular using special struts, should at least be retained, if not even improved, and the support module should be compact when viewed in the radial direction.
  • a correspondingly optimized fan which comprises a support module according to the invention.
  • the fan should have a significantly higher static efficiency than in the prior art, in particular when using a so-called GR module of the “spider” type.
  • the support struts of such a GR module are usually made of round material. The occurrence of a subharmonic rotary tone should be shifted towards higher pressures compared to the prior art or be significantly reduced in a relevant operating range.
  • the generic support module is characterized in that the struts, with a compact design, are adapted to the flow emerging from the fan impeller.
  • the term “strut” is to be understood in the broadest sense in the context of the teaching, which is initially claimed in a very general way. These are stabilizing spacers between the base plate carrying the motor and the fan impeller and the nozzle plate.
  • the struts should form a compact unit due to their stiffness / strength and their number and distribution around the fan impeller and at least reduce or as far as possible eliminate the disadvantages occurring in the prior art due to their adaptation to the flow emerging from the fan impeller.
  • the struts can basically be flat, planar components as well as profiled components, with different types of struts being combinable with one another. It is also conceivable that one type of strut replaces another type of strut.
  • the struts can have a curvature and / or a changing thickness in cross section.
  • their shape and alignment are adapted to the flow conditions after the air emerges radially from the fan impeller. The adjustment can stabilize the flow and increase the efficiency and reduce the subharmonic sound, depending on the specific adjustment.
  • the struts are advantageously profiled, whereby the aforementioned adaptation to the air flow can be realized. It is conceivable that the struts can have approximately the same or a similar cross-sectional contour as the blades of the fan impeller.
  • the struts have an upstream edge and a downstream edge. It is of further advantage if the struts on the inflow side have more rounded edges in cross-section, in contrast to the outflow side edges, similar to a wing, in order to ensure an aerodynamically stable behavior of the struts with regard to varying angles of inflow.
  • the struts have convexly curved surfaces on the suction side and concavely curved surfaces on the pressure side.
  • the profile struts have a different angle at their inflow edge than at their outflow edge, which results from their curvature. Front and rear edge angles are designed in such a way that the efficiency of the fan is high and the sound generation of the fan is low.
  • the struts are arranged radially outside the air outlet of the fan impeller on the outflow side, preferably parallel to the impeller axis. This allows the installation space to be minimized.
  • the number of struts can vary as required. At least four struts should be provided, it being possible to provide six to ten struts, depending on the size and intended use of the support module or the fan comprising the support module, depending on the required stability.
  • the struts have a load-bearing function, namely they hold the base plate with the motor and the impeller on the nozzle plate.
  • the provision of the struts can be used to favor the flow, in accordance with the specific design of the struts discussed above.
  • the struts can be made of different materials and accordingly by different processes.
  • the struts can be produced as aluminum profiles or sheet steel using the extrusion process or as plastic profiles using injection molding processes. It should be noted whether the struts take on the load-bearing function as the sole components or whether additional stabilizing and thus load-bearing components are provided.
  • side parts can be provided in or near the corner areas of the nozzle plate, which extend between the nozzle plate and the base plate. These can be independent components that are connected to the nozzle plate and the base plate. These side parts are radially outside the air outlet of the Fan impeller on the downstream side, preferably parallel to the impeller axis, is arranged.
  • the side parts are advantageously arranged at a small distance from the optionally corresponding struts, in such a way that the side parts at their front edges are aligned with the corresponding struts at their rear edge with a small distance, so that the side parts and struts with their front and rear edges form an aerodynamically acting unit form.
  • the side parts are advantageously arranged near the corner areas between the nozzle plate and the base plate and / or in the vicinity of the struts, for example directly adjoining them.
  • the side parts can be designed as flat plastic injection-molded parts or as flat metal sheets, with stabilizing embossing, beads, etc. can be provided. Overall, it is advantageous if at least four of these side parts are provided, with six to ten side parts, for example eight side parts, being provided alone or in addition to the struts discussed above, depending on the size and use of the support module.
  • the side parts can have a load-bearing function in accordance with the above explanations and hold the base plate and the motor with the impeller on the nozzle plate. In addition, they should stabilize the air flow and thereby increase the efficiency and reduce the subharmonic sound as much as possible.
  • the profiled struts and the rather flat side parts are connected to one another in pairs, preferably by means of suitable connecting means, so that a specific arrangement and alignment of the struts and side parts provided in pairs results.
  • the arrangement of the strut and side part acts particularly as an aerodynamic unit and can thereby promote the flow.
  • the struts and / or side parts preferably with their inflow edges are as small as possible from the rear edges of the impeller blades. This again favors the compact design with favorable flow conditions.
  • nozzle plate and base plate it is advantageous if these have an edge area with folds that stiffen or stabilize the two plates.
  • the edges also provide ideal fastening areas for the struts and / or the side parts.
  • the base plate and, if necessary, the nozzle plate can be made of sheet metal or plastic, based on suitable manufacturing processes.
  • the base plate can have a four-cornered or polygonal contour with chamfered corners, wherein the contour can in principle also be rectangular.
  • a contouring with chamfered corners is to be preferred if the fan comprising the support module is built into an air duct or the like with axial air routing.
  • the base plate of the support module advantageously extends radially over the entire circumference by at least 10% over the entire impeller or over the bottom disk of the impeller.
  • the base plate of the support module advantageously has no openings or breakthroughs that are relevant in terms of flow technology within its radial outer contour.
  • the radial extension of the nozzle plate defines the radial installation space of the support module. This is due to the specific arrangement and design of the struts and side parts.
  • the fan according to the invention is equipped with a support module of the type discussed above, whereby the efficiency losses occurring in the prior art, air power losses and an increase in noise due to the necessary provision of struts can be reduced, if not even eliminated.
  • a fan with the support module according to the invention is also extremely stable with a compact design.
  • Fig. 1 in a perspective view seen from the inflow side
  • FIG. 2 shows the fan with support module from FIG. 1 in an axial plan view in a planar section from the downstream side
  • 3 shows, in a perspective view from the side, in a section on a plane through the axis, the exemplary embodiment of a fan with a support module according to FIGS. 1 and 2,
  • Fig. 4 is a perspective view from the inflow side of a further embodiment of a fan with a support module according to the invention, wherein the support module has no side panels,
  • FIG. 5 shows the fan with support module according to FIG. 4 in an axial plan view in a planar section from the inflow side
  • FIGS. 4 and 5 shows the fan with support module according to FIGS. 4 and 5 in an axial plan view in a planar section, seen from the outflow side,
  • FIG. 6a shows a detailed view of FIG. 6, with additional angles being shown schematically
  • Fig. 8 in schematic diagrams the representation of the courses of the static pressure increases of a fan with Standardauf suspension and a fan with a support module according to the invention at constant speed
  • FIG. 9 shows, in schematic diagrams, the representation of the course of the static efficiency of a fan with standard suspension and of a fan with a support module according to the invention at constant speed
  • Fig. 10 shows in schematic diagrams the representation of the curves of the suction-side sound power level of a fan with Standardauf suspension and a fan with a support module according to the invention at constant speed
  • FIG. 11 shows, in schematic diagrams, the representation of spectra of the suction-side sound pressure of a fan with standard suspension and of a fan with a support module according to the invention at constant speed and the same flow rate, and
  • FIG. 12 shows, in an axial plan view, in a planar section from the inflow side, the fan with support module according to FIGS. 4 to 6, installed in an air duct.
  • the fan impeller 3 shows an exemplary embodiment of a fan with a support module 1 according to the invention in a perspective view from the inflow side.
  • the inside of the fan impeller 3 can be seen, advantageously of a radial or diagonal design.
  • the inlet nozzle 2 attached to a nozzle plate 5 can also be seen on the inflow side.
  • the support module 1 consists in particular of a base plate 6 and 8 lateral struts 8 radially outside (outflow side) of the air outlet of the fan impeller 3.
  • the struts are referred to below as profile struts 8 due to their design.
  • the fan impeller 3 consists essentially of a bottom disk 9, a cover disk 19 and blades 18 extending between them.
  • side parts 7 designed as side plates, which have a load-bearing function, that is, they represent the load-bearing connection between the nozzle plate 5 and the base plate 6.
  • the number of side plates 7, if present or necessary, is advantageous , four.
  • the profile struts 8 can advantageously be formed from plastic.
  • the profile struts 8 and the side plates 7 cover part of the outflow surface, whereby the flow is stabilized.
  • the static efficiency of the fan is higher, especially in areas of the characteristic curve Pressing improved.
  • the side parts 7, advantageously made of sheet metal are flat in the exemplary embodiment, that is to say they essentially consist of a one-piece, cohesive flat area. This is advantageous for a simple and inexpensive production of the support module 1 or its side parts 7.
  • Fastening provisions 23 and 24 are provided for connecting the side parts 7 to the nozzle plate 5 and the base plate 6, respectively.
  • fasteners 25 and 26 for connecting the profile struts 8 to the nozzle plate 5 and the bottom plate 6 are formed.
  • the connection can advantageously be made in particular by screws, rivets, but also welding.
  • the nozzle plate 5 made of sheet metal has on its outer edge a folded area 22 which stabilizes the nozzle plate 5 and in the parts of the arrangements 23 and 25 are integrated.
  • the base plate 6 made of sheet metal has on its outer edge a folded area 27 which stabilizes the base plate 6 and in which parts of the fastening arrangements 24 and 26 are integrated.
  • the bottom plate 27 may be molded from plastic.
  • the sheet metal 6 on the bottom pane side extends radially as far as the profile struts 8 and the side parts 7.
  • FIG. 2 shows, in an axial plan view and in a planar section from the outflow side, the fan with the support module 1 according to FIG.
  • the essentially flat, load-bearing side parts 7 have an edge 12 on the inflow side and an edge 13 on the outflow side.
  • the profile struts 8 are not even seen in cross section, rather have approximately the cross-sectional contour of a support wing. That is, they have a curvature and a non-constant thickness and their shape and orientation are optimally adapted to the flow conditions that occur after the air has emerged from the impeller 3 in the radial direction to the outside.
  • the also profiled blades 18 of the impeller 3 have the upstream edges 10 and the downstream edges 11.
  • the profile struts 8 have upstream edges 14 and downstream edges 15.
  • the upstream edges 14 are seen in cross section rather round, similar like a wing, in order to ensure an aerodynamically stable behavior of the profile struts 8 with respect to different angles of attack. They have convexly curved suction-side surfaces 42 and concavely curved pressure sides 43. Compared to an imaginary radial, the profile struts have a different angle at their inflow edge 14 than at their outflow edge 15, which expresses their curvature as seen in the cross section shown.
  • leading and trailing edge angles are designed so that the fan efficiency is high and the fan noise generation is low.
  • the front edges 12 of the flat side part 7 are not rounded because the side part 7 is a flat sheet metal.
  • the flat side parts 7 on their front edges 12 are precisely aligned with corresponding profile struts 8 on their rear edges 15 with a small spacing, so that the side parts 7 with the respective corresponding profile struts 8 act like an aerodynamically acting unit with front edges 14 and rear edges 13 in an optimal manner.
  • the aerodynamically shaped profile struts 8 run parallel to the fan axis, which runs perpendicular to the plane of the drawing. Since the profile struts 8 in the exemplary embodiment are not load-bearing and are advantageously manufactured in plastic injection molding, a different course, for example not parallel to the axis or with a variable cross section, would also be conceivable.
  • fastening provisions 17 of the nozzle plate 5 or of the fan can be seen on a higher-level system such as an air-technical device or an air duct.
  • the support module 1 does not essentially protrude beyond the nozzle plate 5 and is therefore particularly compact when viewed in the radial direction and therefore requires little installation space.
  • the support module 1 has an approximately rectangular, advantageously approximately square, cross-section with the width w (37) (in the case of a rectangular cross-section, w is the greater width).
  • W (37) is advantageously not greater than 1.25 times the mean diameter of the rear edges 11 of the blades 18 of the impeller 3 with respect to the fan axis.
  • Fig. 3 shows in a perspective view from the side and in a section on a plane through the axis, the embodiment of a fan with support module 1 according to Figures 1 and 2.
  • the inlet nozzle 2 is attached to the nozzle plate 5 or can advantageously also be molded directly into the nozzle plate 5, for example by means of a deep-drawing process.
  • the nozzle plate 5 has a folded edge area 22 which stabilizes the nozzle plate 5 and can be integrated into the arrangements 23 and 25.
  • the folded area 22 also has an advantageous function for the flow conditions and thus for air output and efficiency.
  • the flow in this area within the support module 2 is stabilized by the folded area 22, which has a positive effect on the secondary flow through the radial gap 44 between the inlet nozzle 2 and the cover plate 19.
  • a further embodiment of a fan with a support module 1 according to the invention is shown in a perspective view from the inflow side.
  • the support module 1 does not have any side panels.
  • the profile strive 8 take on the support function and hold the base plate 6, the motor and the impeller 3 on the nozzle plate 5.
  • the profile struts 8 are advantageously made of metallic material.
  • the design of the profile struts 8 as extruded aluminum profiles has proven to be particularly cheap and effective. But it is also conceivable to manufacture them from high-strength plastic, cast aluminum or sheet steel.
  • the side profile struts 8 are made of sheet metal.
  • a sheet metal can be curved or edged in a suitable manner in order to realize a profile shape or at least the curved center line of the profile shape, seen in a cross section analogous to FIG. 2.
  • the fan with support module 1 according to FIG. 4 is shown in an axial plan view and in a planar section from the inflow side.
  • the rotor of the motor 4 and the attachment of the bottom disk 9 of the impeller 3 to the motor 4 can be seen in the center.
  • the air flowing radially out of the impeller 3 flows with little loss on the profile struts 8, initially over their front edge areas 14 and further over the thin rear edge areas 15 from the support module 1.
  • the profile struts 8 ensure through their design in interaction with the nozzle plate 5 and the base plate 6 for a stabilization of the flow inside the support module 1 and thus for an increase in efficiency and / or a noise reduction, at least a subharmonic noise (noise in a frequency range below the blade following frequency, see also description of FIG. 11).
  • the outer contour of the base plate 6 resembles a square with chamfered corners 45 in an axial plan view. It can also have an approximately rectangular contour. The contouring with the chamfered corners 45 is particularly advantageous if the fan with the support module 1 according to the invention is installed in an air duct or the like with axial air routing, see also FIG. 12. In the axial plan view according to FIG.
  • the base plate 6 of the support module 1 viewed in the radial direction, always extends over the entire circumference over the outer contour of the base disk 9 of the impeller 3. It advantageously extends radially over the entire circumference without interruption by at least 10% Over the bottom disk 9 of the impeller 3, further advantageously it extends over the entire circumference without interruption by at least 10% radially over the entire impeller 3 including blades 18 and cover plate 19.
  • the bottom plate 6 has no essential, fluidically relevant openings or openings within its outer contour Openings (except for holes, cable openings, gaps as a result of manufacturing tolerances or the like)
  • the fan with support module 1 according to FIGS. 4 and 5 is shown in an axial plan view and in a planar section from the outflow side.
  • the rear edges 11 of the blades 18 of the impeller 3 have a relatively small distance from the inflow edges 14 of the profile struts 8, which is advantageous for the radial compactness of the support module 1 and thus the fan, and also advantageous for achieving a high level of efficiency.
  • the blades 18 of the impeller 3 protrude with their front edges 10 radially inward over the inner edge of the cover disk 19.
  • the profile struts 8 do not protrude with their trailing edges 15 radially beyond the radial outer contour of the nozzle plate 5, i.e. the radial extent of the nozzle plate 5 defines the radial construction space of the compact support module 1 and thus of the fan.
  • Fastening means 17 for fastening the fan to a higher-level system are advantageously provided on the nozzle plate 5.
  • Fig. 6a is a detailed view of Fig. 6, with additional angle sizes are shown schematically on a profile strut 8, namely the front edge angle a 46 at the front edge 14 and the rear edge angle ⁇ 47 at the rear edge 15.
  • the front edge angle a 46 is, in one Section at a plane perpendicular to the axis correspond to the illustration according to FIG. 6a, the angle between the local circumferential direction U 48 and the profile center line at the inflow edge 14 of a profile strut 8.
  • the trailing edge angle ß 47 corresponds to a section on a plane perpendicular to the axis the illustration according to FIG. 6a, the Angle between the local circumferential direction U 48 and the profile center line at the trailing edge 15 of a profile strut 8.
  • leading edge angle ⁇ 46 and the trailing edge angle ß 47 are optimally adapted to the flow emerging from the impeller 3 customized.
  • a 46 is not equal to ⁇ 47, further advantageously a 46 is larger than ⁇ 47, in particular larger by at least 10 °.
  • a 46 and ß 47 are advantageously smaller than 45 °.
  • Fig. 7 shows a perspective view from the inflow side of a further embodiment of a fan with inventive support module 1.
  • the support module 1 in this embodiment has only four profile struts 8, so has none free-standing profile struts without associated side plates. All four profile struts 8 are assigned to a side plate 7.
  • the side plates 7 and the associated profile struts 8 are connected to one another with connecting elements 16 in order to ensure a better alignment of the side plates 7 and the profile struts 8 with one another.
  • the side profile struts 8 are made of sheet metal.
  • a sheet metal can be suitably curved or, if necessary, folded several times in order to have a profile shape or at least the curved profile center line of the profile shape, seen in a cross section analogous to FIG. 6a.
  • the leading edge angle ⁇ 46 and the trailing edge angle ⁇ 47 are to be selected as described above with reference to FIG. 6, in order to achieve high efficiencies and low noise emissions.
  • Fig. 8 shows the representation of the curves of the static pressure increases of a fan with standard suspension and a fan with fiction according to the support module at constant speed.
  • This illustration clarifies the mode of operation of a support module according to the invention by comparing a characteristic curve of a fan with a support module according to the invention with a characteristic curve of an otherwise identical fan, in particular with the same impeller and the same motor, but in which the housing is replaced by a standard motor mount.
  • suspension for example consisting of fluidically largely neutral round metal struts, is replaced.
  • Curve 20 shows the course of the static pressure increase for the fan with standard motor suspension (reference fan) as a function of the delivery volume flow.
  • the fan with the support module according to the invention has the characteristic curve 21 for the static pressure increase as a function of the delivery volume flow.
  • the dotted line 28 shows an exemplary volume flow, which is also used as a basis for the following description of the figures.
  • Fig. 9 the representation of the curves of the static efficiencies in dependence from the delivery volume flow of a fan with standard suspension and a fan with inventive support module at constant speed is shown schematically.
  • the static efficiency achieved in each case is plotted as a function of the volume flow at constant speed.
  • the dashed efficiency characteristic curve 29 is achieved with measurements of a backward curved radial fan with standard suspension (reference fan), whereas the solid efficiency characteristic curve 30 is achieved with measurements of the same fan but using a support module according to the invention instead of a standard suspension. It can be clearly seen that, particularly in areas of medium to low volume flows, that is to say with rather high static pressure increases (see FIG. 9), the efficiency is noticeably increased by a support module according to the invention.
  • the improvement is rather less. In the area of medium to low volume flows or high static pressure increases, the improvement amounts to a few percentage points, in particular it amounts to at least 2 at the point of maximum increase Percentage points or at least 3% relative.
  • the dotted line 28 shows the same exemplary volume flow that is also used as a basis for FIG. 8. With this volume flow, the static efficiency is increased by 3 percentage points or about 4% by using a support module according to the invention instead of a standard suspension from approx. 74.5% to approx. 77.5%.
  • Fig. 10 the curves of the suction-side sound power level of a fan with standard suspension and a fan with a support module according to the invention at the same and constant speed are shown.
  • the dashed curve 32 represents the course of the suction-side sound power of the reference fan as a function of the air volume flow
  • the solid curve 33 represents the suction-side sound power of the otherwise identical fan but with the support module according to the invention instead of a standard suspension about the same for both fans, somewhat higher for the fan with the support module according to the invention.
  • a constant air volume flow 28 is shown as a dotted line.
  • sound pressure spectra are also shown in FIG. 11 for comparison. It should be mentioned again at this point that all of the curves shown in FIGS. 8-11 correspond to the same and constant speed, with the impeller of at least identical construction and the at least identical motor always being used.
  • Fig. 11 shows the representation of spectra of the suction-side sound pressure of a fan with standard suspension and a fan with fiction according support module at constant speed and the same flow rate 28, which is shown in FIGS. 8-10.
  • the dashed curve 39 shows the sound pressure spectrum of the reference fan and the solid curve 40 shows the sound pressure spectrum of the fan with the support module according to the invention at the delivery volume flow 28 (Fig. 8-10).
  • the frequency resolution in the diagram shown is 3,125 flz. With other frequency resolutions, however, the same effects can be seen qualitatively.
  • the three frequencies 34 shown are the first, the second and the third harmonics of the blade repetition frequency of the impeller of the fan.
  • the sound at the first harmonic of the reed repetition frequency is also known as the rotating tone.
  • the sound pressure in the range of these frequencies is significantly higher for both the reference fan (curve 39) and the fan with the support module according to the invention (curve 40) compared to the general trend of the curves, with the sound pressure in particular at the first blade repetition frequency being higher for the fan with the support module according to the invention than with the reference fan. This is particularly due to the interaction of the impeller blades with the side plates and / or the profile struts.
  • the elevation of the sound pressure curves in the form of elevation areas 41 is decisive for the mode of operation of the support module according to the invention.
  • the sound corresponding to this is referred to as subharmonic sound.
  • subharmonic sound With backward-curved fans, especially at operating points of rather higher static pressure increases, it occurs regularly at a frequency of about 60% -90% of the first blade repetition frequency.
  • the subharmonic sound which is generally dependent on the delivery volume flow, is significantly reduced with the delivery volume flow shown for the fan with the support module according to the invention, in the example shown by about 7-8 dB, generally by 1-15 depending on the volume flow and frequency resolution dB.
  • the frequency of the subharmonic sound is also shifted slightly, by about 5% -20% of the first reed repetition frequency.
  • This reduction and frequency shift of the subharmonic sound at operating points with a medium to low delivery volume flow and rather large static pressure increases is caused by a flow stabilization by a support module according to the invention.
  • the remaining sound for example the sound at a harmonic of the blade repetition frequency 34 or the broadband sound, can be higher or lower in a fan with a support module according to the invention than in the case of a fan Reference fan.
  • Decisive for the description of the mode of action is only the reduction of the subharmonic noise in the case of the fan with housing. It is typical, however, that the sound at the first harmonic of the blade repetition frequency in the fan with the support module according to the invention is increased compared to the reference fan.
  • this sound can be reduced with active noise canceling, that is to say cancellation of the sound by bringing in anti-phase sound. This is technically simple, since the blade repetition frequency can easily be determined with a known speed in fan operation.
  • Fig. 12 shows in an axial plan view and in a planar section from the inflow side of the fan with support module 1 according to Figures 4 to 6, installed in an air duct 35.
  • the support module 1 has at least approximately 90 ° rotational symmetry with respect to the fan axis.
  • the support module 1 has, in the section shown or in an axial plan view, a width w (37). It is determined by the side length of the smallest square circumscribed around the support module 1 in section on a plane perpendicular to the axis or in an axial plan view.
  • the width w (37) of the support module 1 is advantageously 1.15-1.3 times the mean diameter D of the rear edges 11 of the blades 18 of the fan impeller 3, which expresses the radial compactness of the support module 1 with respect to the impeller 3 . If the width w is variable for different sectional planes, the maximum width w seen over the entire axial height of the support module is to be used for the assessment, without taking the nozzle plate into account.
  • the width s (38) of the air duct 35 assigned to a fan is advantageously in the range from 1.2 to 1.8 times the width w (37) of the associated support module 1 or in the range from 1.5 to 2 , 3 times the mean diameter D of the trailing edges 11 of the blades 18 of the fan impeller 3.
  • the ratio s / w of the width s (38) of the air duct 35 assigned to a fan and the width w (37) of the associated support module 1 is less than 1.4, it can be advantageous to have the beveled corners 45 on the support module 1 so that the outflowing air has more flow area in the axial direction between the base plate 6 and the air duct wall 36.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Cooling Or The Like Of Electrical Apparatus (AREA)

Abstract

L'invention concerne un module de support conçu pour un ventilateur comprenant un moteur et un rotor de ventilateur entraîné par ce moteur, conçu en particulier pour un ventilateur radial ou diagonal, pour fixer le rotor de ventilateur entre une plaque de buse côté amenée et une plaque de base agencée en face et à distance de la plaque de buse. Le moteur et le rotor de ventilateur sont montés rotatifs sur ou dans la plaque de base et maintenus contre la plaque de buse au moyen d'entretoises s'étendant entre la plaque de base et la plaque de buse. Cette invention est caractérisée en ce que les entretoises sont adaptées à l'écoulement sortant du rotor de ventilateur dans une configuration compacte. L'invention concerne en outre un ventilateur équipé d'un module de support correspondant.
EP20859651.0A 2020-01-14 2020-12-04 Module de support conçu pour un ventilateur et ventilateur équipé d'un module de support correspondant Pending EP4090852A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102020200363.7A DE102020200363A1 (de) 2020-01-14 2020-01-14 Tragmodul für einen Ventilator und Ventilator mit einem entsprechenden Tragmodul
PCT/DE2020/200107 WO2021143971A1 (fr) 2020-01-14 2020-12-04 Module de support conçu pour un ventilateur et ventilateur équipé d'un module de support correspondant

Publications (1)

Publication Number Publication Date
EP4090852A1 true EP4090852A1 (fr) 2022-11-23

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EP20859651.0A Pending EP4090852A1 (fr) 2020-01-14 2020-12-04 Module de support conçu pour un ventilateur et ventilateur équipé d'un module de support correspondant

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US (1) US20230121923A1 (fr)
EP (1) EP4090852A1 (fr)
JP (1) JP2023510519A (fr)
CN (1) CN115053072A (fr)
BR (1) BR112022012984A2 (fr)
DE (1) DE102020200363A1 (fr)
WO (1) WO2021143971A1 (fr)

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Publication number Priority date Publication date Assignee Title
DE102022124201A1 (de) * 2022-09-21 2024-03-21 Ebm-Papst Mulfingen Gmbh & Co. Kg Radialventilator mit nachrüstbaren Luftleitsegmenten

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FR2991013B1 (fr) * 2012-05-23 2017-09-01 Valeo Systemes Thermiques Ventilateur pour automobile avec deflecteur aerodynamique
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CN110206767A (zh) * 2019-06-28 2019-09-06 奇昇净化科技（昆山）有限公司 一种ffu四风道箱体结构

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JP2023510519A (ja) 2023-03-14
BR112022012984A2 (pt) 2022-09-13
CN115053072A (zh) 2022-09-13
DE102020200363A1 (de) 2021-07-15
WO2021143971A1 (fr) 2021-07-22
US20230121923A1 (en) 2023-04-20

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