EP3215745A1 - Schutzgitter mit verbessertem wirkungsgrad- und geräuschverhalten - Google Patents
Schutzgitter mit verbessertem wirkungsgrad- und geräuschverhaltenInfo
- Publication number
- EP3215745A1 EP3215745A1 EP15745489.3A EP15745489A EP3215745A1 EP 3215745 A1 EP3215745 A1 EP 3215745A1 EP 15745489 A EP15745489 A EP 15745489A EP 3215745 A1 EP3215745 A1 EP 3215745A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- radial
- protective
- webs
- protective grid
- grid
- 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.)
- Granted
Links
- 230000001681 protective effect Effects 0.000 title claims abstract description 91
- 230000002093 peripheral effect Effects 0.000 claims description 8
- 230000003068 static effect Effects 0.000 description 5
- 230000007423 decrease Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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
- F04D29/70—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
- 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
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/08—Air-flow control members, e.g. louvres, grilles, flaps or guide plates
- F24F13/082—Grilles, registers or guards
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D19/00—Axial-flow pumps
- F04D19/002—Axial flow fans
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/08—Air-flow control members, e.g. louvres, grilles, flaps or guide plates
- F24F13/082—Grilles, registers or guards
- F24F2013/088—Air-flow straightener
Definitions
- the invention relates to protective grids as contact protection for the suction side of fans, for example radial fans or diagonal fans, wherein the protective grids have a planar grid web structure formed of radially spaced radial webs and radially spaced coaxial circumferential webs.
- the material usually plastic or metal is used with relatively thick wall thicknesses to ensure sufficient stability.
- the invention is therefore an object of the invention to provide a protective grille for fans that secured to fans over conventional screens an improved overall static efficiency and reduced sound power guaranteed.
- an at least partially three-dimensionally curved in the axial direction protective grille with fastening means for arrangement on a fan is proposed, the axial central region, however, is further spaced by the at least partially convex shape of the fan and thus the fan wheel.
- the protective grid has a grid web structure which comprises circumferentially spaced radial webs and radially spaced coaxial circumferential webs, wherein the protective grid has at least one radial outer region and a central region about a central axis of the protective grid, an enveloped by the radial outer region and the central region enveloping surface in the radial Outside area convexly curved and flat in the central region, in particular formed parallel to a radial plane of the protective grid.
- the arched shape of the protective grille created by the convex envelope radially outer area increases its strength and stability and makes it possible to form the radial webs and peripheral webs in the cross-section thin-walled. This reduces the inflow surface of the webs, the flow resistance generated by the webs and the vortex formation caused by the webs, which in turn leads to noise.
- the radial webs and / or the circumferential webs have a rectangular cross-section with a height H and a wall thickness B whose ratio is H / B> 3, in particular H / B> 3.5, more preferably H / B> 4 is fixed.
- the side of the radial and circumferential webs determining the wall thickness B points in or counter to the flow direction, which in the central region is at least essentially an axial direction of the protective grid corresponds.
- the protective grid is preferably rotationally symmetrical.
- the central region adjoins in the radial direction directly to the radial outer region, wherein the convexly curved enveloping surface of the radial outer region flows smoothly into the flat central region.
- This jumpless design of the protective grid along its envelope surface also favors the strength and stability and promotes the ability to form the radial and circumferential webs as described above thin-walled.
- an intermediate region may be provided, the envelope surface of which has a smaller convex curvature than the radial outer region, but is not formed flat.
- the circumferential webs arranged in the radial direction in each case at a radial distance r from the axial center of the protective grid each have a varying angular position relative to an axial plane of the protective screen.
- the angular adjustment of the circumferential webs increases in the direction radially outward of the protective screen.
- the angle is measured between an extent of the circumferential webs along their height direction (height H) and the axial plane of the protective grid.
- the increasing angular adjustment of the circumferential webs from the central area in the direction of the radial outer area also contributes to the noise reduction and improved efficiency of the connected fan.
- the radial webs each have a curved shape in an axial cross-section and extend arcuately with a pointing to the axial center line of the protective grating arch bell.
- the convexly curved envelope surface in the radial outer region in a lateral cross section determines a partially elliptical contour and is characterized in that the ratio of the radial length a of the outer region to the radius c of the protective grid to a / c> 0, 25 is fixed. This results in a radial extent of the radial outer area of at least 25% of the total radius of the protective grid. Furthermore, a variant embodiment is preferred in which a ratio of the axial height b of the protective grid to the radius c of the protective grid is set to b / c> 0.02.
- the ratio of the axial height b of the protective grid to the radius c of the protective grid in a range of 0.025 ⁇ b / c ⁇ 1, so that ensures a sufficient axial distance to the connected fan or its fan wheel and at the same time in terms of noise and efficiency optimized guard is provided.
- the radial webs radially or axially beyond the outermost of the circumferential webs extend and form an outer edge of the protective grid, which is designed to be open flow. Since the protective grid in the outermost radial outer region extends almost exclusively in the axial direction, the main portion is located at an axial extent of the radial webs on the radially outermost peripheral web.
- the fastening means are integrally formed on the protective grid, in order to enable a connection to the fan via the fastening elements customary in the prior art. chen.
- the protective grid is formed such that the number of radial webs in the radial outer area is higher than in the central area in order to minimize the flow resistance in the central area. Due to the overall curved shape of the protective grid and the associated increased axial distance of the central region relative to the connected fan or fan wheel, the mesh size of the grid web structure can be increased there. According to the invention, this is done by reducing the number of radial webs provided in the central area, i. their number decreases towards an axial center of the protective grid.
- the invention further comprises the unit formed of a fan with a protective grid as described above, the efficiency of which is improved and the sound power reduced.
- Fig. 1 is a perspective view of a protective grid
- Fig. 2 is a side view of the protective grid of Fig. 1;
- Fig. 3 is a side sectional view of the protective grid of Fig. 1;
- FIG. 5 shows a side view of a part of the envelope surface of the protective grid
- Fig. 6 shows a characteristic comparison of the overall static efficiency of a fan
- Fig. 7 is a characteristic comparison of the sound power of a fan.
- the protective grid 1 shows an embodiment of a rotationally symmetrical protective grid 1 is shown in a perspective view.
- the protective grid 1 has a grid web structure formed by intersecting circumferentially spaced radial webs 2 and radially spaced coaxial circumferential webs 3.
- the radial webs 2 extend radially outwardly beyond the outermost circumferential web 3 and form a radial radial direction outer edge.
- At this radial outer edge of the protective grid 1 are integrally formed four mounting webs 4 spaced in the circumferential direction in each case in 90 degree angles.
- the fastening webs 4 are themselves partially formed from radial webs 2.
- FIG. 2 shows the protective grid 1 from FIG. 1 in a side view.
- the protective grid 1 has a circumferential radial outer area A and a central area Z about the central axis.
- An enveloping surface defined by the radial outer region A and the central region Z is convexly curved in the radial outer region A and flat and flat in the central region Z, so that the central region Z extends parallel to a radial plane X of the protective grating 1.
- the central region Z adjoins in the radial inward direction directly to the radial outer region A. The transition is flowing.
- the number of radial webs 2 is higher than in the central region Z. This is realized in that the radial webs 2 extend differently far in the radial inward direction and partially no longer reach the radially inner circumferential webs 2. Thus, the clear mesh size increases within the grid web structure in the central region Z, whereby at the same time the flow resistance decreases.
- the plurality of circumferential ribs 3 is arranged in the radial direction of the protective grid 1 in each case at a radial distance r from the axial center of the protective grid 1. net.
- FIG. 2 shows a distance r of the fifth of seven circumferential ridges 3, starting from the axial center axis M.
- the distance of the radially outermost circumferential ridge 3 is marked with R.
- the convex curved envelope surface of the protective grid 1 can be specified in more detail.
- the convexly curved envelope surface defines in a lateral cross-section a partially elliptical contour 5 whose ratio of the radial length a of the radial outer region A to the radius c of the protective grid 1 in the embodiment shown assumes an exemplary value of approximately 0.55.
- an exemplary value of 0.35 is set in the illustrated embodiment.
- FIG. 5 shows by way of example an alternative embodiment of a partially elliptic contour 5 of the envelope surface with a stronger convex curvature of the radial outer region A and ratios a / c of more than 0.6 and b / c of more than 0.4.
- Figure 3 shows a side sectional view of the protective grid of Figure 1 with a section through a radial web 2. Good to see the angular position of the peripheral webs 3. Furthermore, the thin-walled design of the radial webs 2 and 3 circumferential webs is shown, wherein the wall thickness B and height H based was characterized by radial webs 2. However, this is applicable to the circumferential webs 3 accordingly. In cross section, both the radial webs 2 and the peripheral webs 3 are rectangular. The ratio of wall thickness B to height H is in the embodiment shown at a value of 5. The thin-walled design of the webs 2, 3 is characterized by the shape of the protective grid. 1 allows.
- FIGS. 6 and 7 are graphs showing total static efficiency curves (FIG. 6) and sound power (FIG. 7) at various flow rates through the grille 1 of FIG. 1 and conventional flat grids.
- the characteristics of the protective grid 1 according to the invention are denoted by 100, those of the conventional protective grid by 200.
- the fan used is always the same.
- the total static efficiency of the protective grid 1 according to the invention continues to rise sharply at a volume flow rate of 400 m 3 / h, thereby producing a difference of more than 2%, which is maintained up to the maximum volume flow.
- the difference in sound power is also evident from a volume flow of 400 m 3 / h, wherein the protective grid 1 according to the invention at the maximum volume flow by more than 4 dBA is quieter than conventional grids.
- the values measured for the protective grid 1 according to the invention are at a level with values of a fan operation without a protective grid.
- the invention is not limited in its execution to the above-mentioned preferred embodiments. Rather, a number of variants is conceivable, which makes use of the illustrated solution even with fundamentally different types of use.
- adjacent circumferential webs can also have an identical angular position.
- the surfaces of the webs of the protective grid facing the flow direction can have a further adapted shape, for example rounded.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102014116047.9A DE102014116047A1 (de) | 2014-11-04 | 2014-11-04 | Schutzgitter mit verbessertem Wirkungsgrad- und Geräuschverhalten |
PCT/EP2015/067821 WO2016071014A1 (de) | 2014-11-04 | 2015-08-03 | Schutzgitter mit verbessertem wirkungsgrad- und geräuschverhalten |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3215745A1 true EP3215745A1 (de) | 2017-09-13 |
EP3215745B1 EP3215745B1 (de) | 2020-04-01 |
Family
ID=53709991
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP15745489.3A Active EP3215745B1 (de) | 2014-11-04 | 2015-08-03 | Schutzgitter mit verbessertem wirkungsgrad- und geräuschverhalten |
Country Status (5)
Country | Link |
---|---|
US (1) | US10760593B2 (de) |
EP (1) | EP3215745B1 (de) |
CN (1) | CN204512009U (de) |
DE (2) | DE202014105284U1 (de) |
WO (1) | WO2016071014A1 (de) |
Families Citing this family (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102015107907A1 (de) | 2015-05-20 | 2016-11-24 | Ebm-Papst Mulfingen Gmbh & Co. Kg | Ebenes Strömungsleitgitter |
DE202015104813U1 (de) | 2015-09-10 | 2015-10-15 | Ebm-Papst Mulfingen Gmbh & Co. Kg | Strömungsleitgitter zur Anordnung an einem Ventilator |
DE102016115616A1 (de) * | 2016-08-23 | 2018-03-01 | Ebm-Papst Mulfingen Gmbh & Co. Kg | Strömungsgleichrichter eines Ventilators |
JP6609538B2 (ja) * | 2016-11-18 | 2019-11-20 | 日立グローバルライフソリューションズ株式会社 | 電動送風機及びこれを有する電気掃除機 |
US20180296405A1 (en) * | 2017-04-17 | 2018-10-18 | Sherry May Raymond-Coblantz | Wound protection device |
CN107191415A (zh) * | 2017-05-05 | 2017-09-22 | 珠海格力电器股份有限公司 | 一种格栅结构及具有其的风扇 |
DE102017209291A1 (de) * | 2017-06-01 | 2018-12-06 | Ziehl-Abegg Se | Ventilator und Vorleitgitter für einen Ventilator |
DE102017007370A1 (de) * | 2017-08-07 | 2019-02-07 | Ebm-Papst St. Georgen Gmbh & Co. Kg | Lüfter |
CN207122442U (zh) | 2017-08-18 | 2018-03-20 | 开利公司 | 风扇罩壳及具有其的空调机组 |
DE102017122987A1 (de) * | 2017-10-04 | 2019-04-04 | Ebm-Papst Mulfingen Gmbh & Co. Kg | Halbspiralgehäuse |
CN109990328B (zh) * | 2017-12-29 | 2023-12-26 | 青岛海尔智能技术研发有限公司 | 一种吸油烟机及其风机组件 |
CN110017302A (zh) * | 2018-01-10 | 2019-07-16 | 青岛海尔智慧厨房电器有限公司 | 风机及油烟机 |
DE102018205300A1 (de) * | 2018-04-09 | 2019-10-10 | Ziehl-Abegg Se | Ventilator und Einströmgitter für einen Ventilator |
CN110206759A (zh) * | 2018-08-06 | 2019-09-06 | 华帝股份有限公司 | 用于吸油烟机的进风圈及蜗壳及吸油烟机 |
DE102019213610B3 (de) | 2019-09-06 | 2020-12-17 | Wilhelm Bruckbauer | Einströmdüse |
US11927202B2 (en) * | 2020-04-21 | 2024-03-12 | Quanta Computer Inc. | Server fan guard |
DE102022105365A1 (de) | 2022-03-08 | 2023-09-14 | Ebm-Papst Mulfingen Gmbh & Co. Kg | Schutzvorrichtung zur Anordnung stromab eines um eine Rotationsachse rotierbaren Laufrades |
EP4245999A1 (de) * | 2022-03-18 | 2023-09-20 | Mann+Hummel Life Sciences & Environment Holding Singapore Pte. Ltd. | Strömungsgitter und raumluftreinigungsvorrichtung |
DE102022115066A1 (de) | 2022-06-15 | 2023-12-21 | Berbel Ablufttechnik Gmbh | Dunstabzug und Kombinationsgerät |
CN220758729U (zh) * | 2023-09-06 | 2024-04-12 | 陈达楷 | 泡沫机 |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US144034A (en) | 1873-10-28 | Improvement in car-couplings | ||
US4657483A (en) * | 1984-11-16 | 1987-04-14 | Bede James D | Shrouded household fan |
US6071079A (en) * | 1998-03-27 | 2000-06-06 | Lasko Holdings, Inc. Usa | High velocity fan |
US6213718B1 (en) * | 1998-04-27 | 2001-04-10 | Emerson Electric Co. | Air circulation fan with removable shroud |
DE10162919A1 (de) * | 2001-12-20 | 2003-07-03 | Bsh Bosch Siemens Hausgeraete | Lüftervorrichtung |
DE102005019421B4 (de) * | 2004-04-26 | 2014-02-13 | Behr Gmbh & Co. Kg | Lüfterhaube für einen Wärmeübertrager, insbesondere für Kraftfahrzeuge |
US7806961B2 (en) * | 2006-03-17 | 2010-10-05 | Em Innovative Properties Company | Control interface for a variable speed fan device |
BRPI0801984F1 (pt) * | 2008-05-19 | 2020-11-24 | Seb Do Brasil Produtos Domesticos Ltda | sistema aplicado em grades frontal e traseira de ventiladores |
DE202009017511U1 (de) | 2009-12-22 | 2011-05-05 | Ebm-Pabst Mulfingen Gmbh & Co. Kg | Lüftereinheit für Filterlüfter |
EP2541068B1 (de) * | 2011-06-29 | 2016-08-10 | ebm-papst Mulfingen GmbH & Co. KG | Axialventilator mit Strömungsleitkörper |
DK2778432T3 (en) * | 2013-03-15 | 2016-01-25 | Ebm Papst Mulfingen Gmbh & Co | Fan device with flow rectifier |
US9835176B2 (en) * | 2013-04-05 | 2017-12-05 | Acoustiflo Llc | Fan inlet air handling apparatus and methods |
DE102014102370A1 (de) * | 2014-02-24 | 2015-08-27 | Ebm-Papst St. Georgen Gmbh & Co. Kg | Strömungsgleichrichter sowie Lüfteranordnung mit Strömungsgleichrichter |
-
2014
- 2014-11-04 DE DE202014105284.4U patent/DE202014105284U1/de active Active
- 2014-11-04 DE DE102014116047.9A patent/DE102014116047A1/de not_active Withdrawn
-
2015
- 2015-01-07 CN CN201520009649.XU patent/CN204512009U/zh active Active
- 2015-08-03 WO PCT/EP2015/067821 patent/WO2016071014A1/de active Application Filing
- 2015-08-03 EP EP15745489.3A patent/EP3215745B1/de active Active
- 2015-08-03 US US15/517,472 patent/US10760593B2/en active Active
Also Published As
Publication number | Publication date |
---|---|
DE102014116047A1 (de) | 2016-05-04 |
EP3215745B1 (de) | 2020-04-01 |
US20170306985A1 (en) | 2017-10-26 |
WO2016071014A1 (de) | 2016-05-12 |
DE202014105284U1 (de) | 2014-12-08 |
CN204512009U (zh) | 2015-07-29 |
US10760593B2 (en) | 2020-09-01 |
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