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
  • 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
  • F04D29/66—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

Definitions

• the invention relates to a fan device, in particular for an extractor hood, with a motor fastened to a carrier part for driving a fan wheel, the carrier part having a grid in an inflow region of the fan wheel, which is formed by a plurality of webs.
• the fan arrangement comprises a cooling fan with radial impellers, which is provided with an axially directed inlet connector and a front cover plate of the impeller.
• a guide ring with a deflection angle of approximately 90 °, the front inlet plane of which is approximately flush with the plane of the cover disk of the impeller or lies in front of it.
• the rear plane of the guide ring is arranged in the front area of the axial extent of the blade ring, which results in a significantly smaller axial depth without significantly affecting the running properties of the cooling fan.
• DE 197 53 373 A1 describes an axial fan housing which, in particular for cooling purposes in the case of EMC-shielded devices, consists of a receiving part having an air passage opening for an axial fan and a metallic shielding grille covering the air passage opening.
• the shielding grille is designed in the manner of an air guide wheel with vane-like guide webs, which extend over a certain air guide length and are arranged approximately radially.
• the guide bars are distributed in at least two concentric rows of circles, the number of guide bars being greater in the outer row of circles than in the adjacent inner row of circles. Furthermore, it is provided that a circumferential angular spacing of the guide webs at the respective inner connection decreases from the innermost row of rows to the outermost row of circles.
• an angle of inclination ie an angle of inclination of the guide webs to the radial
• a guide angle ie an angle of inclination to the axial
• each guide web has an upper side facing the inflow side and a lower side facing the outflow side.
• the upper sides are each convexly curved, in particular in the form of a circular arc with a radius of curvature R, from the inflow side to the outflow side.
• each guide web should preferably be essentially flat, but it can also be provided that the underside is also provided with a concave or convex curvature.
• US Pat. No. 5,951,245 discloses an arrangement of a centrifugal fan in which the fan arrangement has a centrifugal fan driven by an electric motor and a stationary device for selectively swirling a specific volume of air when the air enters the centrifugal fan arrangement.
• the device is arranged axially with respect to the axis of rotation of the ventilation device and is fixed in such a way that it does not move with respect to the fan.
• the fan unit and the stationary device are surrounded by a housing, wherein the stationary device can be formed in one piece with the housing.
• the centrifugal blower arrangement has the disadvantage, however, that the stationary device is designed to be very complex in terms of construction and only a low efficiency of the centrifugal fan is achieved due to the turbulence of the air caused by the stationary device.
• a fan and diffuser device which has a first row of conical blades or baffles which are concentric and are spaced from each other. Furthermore, a second series of blades or guide surfaces is provided, which are cylindrical. The two rows of the guide plates are each firmly connected to one another, the axial distance between them being variable via a screw spindle.
• the object of the present invention is to provide a fan device, in particular for extractor hoods, which has a low level of noise during operation, achieves a high air flow rate with low power consumption and requires only a small installation space.
• the walls of the openings in the carrier part are curved in the flow direction in such a way that the air can flow in smoothly through the openings and / or can flow over to the fan wheel without jolts or that the air can flow smoothly over the openings from the fan wheel and / or can flow out of the openings , the sucked in or blown out air is deflected more gently and the flow resistance of the openings in the carrier part is significantly reduced.
• the fan wheel is mounted on the carrier part which has the openings in an inflow region of the fan wheel.
• This constructive measure reduces the number of components of the fan device and forms a compact structural unit that has only a small installation space. This is particularly advantageous if an extractor hood is to be made relatively flat.
• the openings are formed by a grid which is formed by the thin-walled webs having the walls, the cross-sections of the webs being curved in such a way that inflowing air is spatially prepared for the fan wheel and supplied without bumps, or that air flowing out of the fan wheel spatially opens the openings prepared and supplied smoothly, the flow resistance of the fan device can be reduced.
• the curved webs are mechanically very stiff, so that the webs can be made very thin-walled. On the one hand, this allows the flow resistance to be reduced and, on the other hand, the forces introduced by the fan wheel can be better transmitted.
• a motor preferably an electric motor
• the fan wheel is fastened to an output shaft of the motor.
• a particularly effective noise minimization and an increase in the fan output is achieved in that the curvature of the webs in the cross-sectional direction or the curvature of the walls of the openings is provided in such a way that air drawn into the fan wheel essentially in the axial direction is deflected in the direction of rotation of the fan wheel , so that it is guided by the blades of the fan wheel in a simple manner to an outflow area of the fan wheel with minimal flow resistances.
• the walls of the openings or the webs of the grille are convex or concave in the cross-sectional direction, so that initially air flowing vertically onto the fan impeller slowly with increasing flow path in the grille and is continuously deflected in an at least approximately radial direction of the fan wheel, specifically in the direction of rotation of the fan wheel.
• the walls of the openings or the webs are designed to be parabolic in cross-sectional direction, so that air flowing into the grille is initially only slightly deflected is and is increasingly deflected in the direction of rotation of the fan wheel with increasing flow path in the grid. In this way, a very harmonious deflection with less flow energy losses is advantageously achieved, which additionally reduces noise and reduces the power requirement of the fan device with the same air flow rate.
• Another constructive measure for the harmonious and low-noise flow of air sucked in by the fan wheel is a further advantageous embodiment of the fan device, in which a section of the walls of the openings or a part of the webs of the grille are at least approximately designed as a hyperboloid.
• These webs or circular webs thus form so-called partial or radial inflow nozzles for the sucked-in air, the circular webs ensuring a constant flow guidance over their entire circumference.
• a further improvement in the flow guidance of the air sucked in by the fan wheel is provided in a further advantageous embodiment of the fan device, in which the grille is provided with additional radial webs, which are also curved in the cross-sectional direction in such a way that the sucked-in air flows in the direction of rotation of the fan wheel the grille is deflected and the fan wheel in connection with the circular webs are optimally three-dimensionally supplied.
• the fan wheel is surrounded by an air guide to which the carrier part is fastened in the installed position.
• the air guide body is provided in a discharge area of the fan wheel with a separate outflow opening, depending on the flow direction, through which the air of the fan wheel can be guided in a targeted manner.
• Figure 1 shows a fan device in particular for an extractor hood in a highly schematic cross section.
• FIG. 2 shows a plan view of the carrier part of the fan device according to FIG. 1;
• FIG. 3 shows a detailed view of a radial web in cross section along the line III-III from FIG. 2.
• FIG. 1 shows a preferred longitudinal section of a preferred fan device 1 that can be used in an extractor hood, not shown, which has a motor 3, preferably an electric motor, for driving a fan wheel 4 fastened to a carrier part 2.
• the carrier part 2 has in a flow area of the fan wheel 4, a grid 5, which is formed by a plurality of webs 6.
• a plurality of openings 17 are defined by the grid 5, which have walls 18 for guiding the air.
• the walls 18 or the webs 6 are curved in the cross-sectional direction in such a way that air flowing in via the openings 17 of the grille 5 is supplied to the fan wheel 4 in a three-dimensional and shock-free manner.
• the motor 3 is provided with a housing 7, which is fastened to the carrier part 2 via a fastening device 8, which in the present case is designed as two screw connections. In the area of the fastening device 8, two electrical contact modules 14 are provided for connecting the motor 3 to a power source.
• a drive shaft 9 protrudes from the housing 7 of the motor 3, which is fixedly connected to the fan wheel 4 and via which the motor 3 drives the fan wheel 4.
• the fan wheel 4 is a radial fan wheel, in which a plurality of blades 12 extending parallel to the drive shaft 9 are arranged in a circle.
• the carrier part 2 has a circular, flat middle part 10 and an at least approximately frustoconical outer area 11, which adjoins the middle part 10.
• the frustoconical outer area 11 of the carrier part 2 Through the frustoconical outer area 11 of the carrier part 2, the flow resistance or a pressure drop when air is sucked in through the fan wheel 4 in the outer region 11 of the carrier part 2 is additionally minimized, since the air drawn in in the outer region 11 of the carrier part 2 flows directly in the direction of the fan wheel 4 and from the curved ones Webs 6 is supplied in the radial direction to the fan wheel 4 or its blades 12.
• the webs 6 of the grille 5 are convex or concave in the cross-sectional direction, so that air drawn in at the webs 6 from a flow which is essentially vertical in the central part 10 and predominantly radial in the outer region 11 towards the grille 5 in a radial flow direction the fan wheel 4 is deflected (see arrows 19). Due to the attachment or arrangement of the motor 3 in the inflow area of the fan wheel 4 and immersed in the fan wheel 4, the axial installation space required for deflecting the sucked-in air is optimally used, so that the fan device 1 is compact in the axial direction. Another advantage of this arrangement is the integration of air guiding functions in the carrier part 2.
• the grid 5 is designed in a network-like manner by so-called radial webs 13.
• the central region 10 of the carrier part to which the motor is attached has ventilation slots 16 for cooling the motor.
• the outermost region 15 of the grid 5 is curved in a funnel shape, so that in cooperation with the circular webs 6 and the radial webs 13, the air is guided to the fan wheel in a flow-favorable manner, as is shown by the arrows 19 in FIGS. 1 and 2.
• the radial webs 13 of the carrier part 2 are also, as shown in FIG. 3, curved in the cross-sectional direction in such a way that air drawn in by the fan wheel 4 is deflected in the direction of rotation of the fan wheel 4 and fed to the fan wheel 4 to reduce a flow resistance. In this way, sucked-in air is redirected three-dimensionally in the direction of rotation of the fan wheel 4 by the circular webs 6, the outermost region 15 and the radial webs 13 (arrow 19), thus minimizing flow resistance in a simple manner.
• the curvature of the webs 6, 13 or the walls 18 of the webs 6, 13 can be designed for a flow direction opposite to the arrows 19, wherein the same advantages as shown above can be achieved.
• the fan wheel 4 instead of attaching the motor 3 to the carrier part 2 and attaching the fan wheel 4 to the drive shaft 9 of the motor 3, only the shaft of the fan wheel 4 can be mounted in the carrier part 2, the fan wheel 4 then, for example, via an external motor and via a Belt drive is drivable.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Structures Of Non-Positive Displacement Pumps (AREA)
• Power Steering Mechanism (AREA)
• Air-Conditioning For Vehicles (AREA)
• Ventilation (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=7710158

Family Applications (1)

Country Status (6)

Cited By (1)

Families Citing this family (11)

Family Cites Families (16)

• 2001
  • 2001-12-20 DE DE10162919A patent/DE10162919A1/de not_active Withdrawn
• 2002
  • 2002-11-27 BR BR0215147-2A patent/BR0215147A/pt not_active Application Discontinuation
  • 2002-11-27 EP EP02805296A patent/EP1458982B1/fr not_active Expired - Lifetime
  • 2002-11-27 AT AT02805296T patent/ATE378515T1/de active
  • 2002-11-27 ES ES02805296T patent/ES2295460T3/es not_active Expired - Lifetime
  • 2002-11-27 DE DE50211232T patent/DE50211232D1/de not_active Expired - Lifetime
  • 2002-11-27 WO PCT/EP2002/013397 patent/WO2003054395A1/fr active IP Right Grant

Non-Patent Citations (1)

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