EP2698542A2 - Ventilateur radial avec boîtier à spirale - Google Patents

Ventilateur radial avec boîtier à spirale Download PDF

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Publication number
EP2698542A2
EP2698542A2 EP13180009.6A EP13180009A EP2698542A2 EP 2698542 A2 EP2698542 A2 EP 2698542A2 EP 13180009 A EP13180009 A EP 13180009A EP 2698542 A2 EP2698542 A2 EP 2698542A2
Authority
EP
European Patent Office
Prior art keywords
spiral
fan
radial fan
length
fan according
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.)
Withdrawn
Application number
EP13180009.6A
Other languages
German (de)
English (en)
Other versions
EP2698542A3 (fr
Inventor
Michael Hornig
Dr. Michael Schmitz
Arnold Schulde
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.)
Ebm Papst St Georgen GmbH and Co KG
Original Assignee
Ebm Papst St Georgen GmbH and Co KG
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 Ebm Papst St Georgen GmbH and Co KG filed Critical Ebm Papst St Georgen GmbH and Co KG
Publication of EP2698542A2 publication Critical patent/EP2698542A2/fr
Publication of EP2698542A3 publication Critical patent/EP2698542A3/fr
Withdrawn legal-status Critical Current

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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
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F04D29/281—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers
    • F04D29/282—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers the leading edge of each vane being substantially parallel to the rotation axis
    • 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
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F04D29/30—Vanes
    • 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

Definitions

  • the invention relates to a radial fan with a fan wheel which is rotatable about an associated axis of rotation in a predetermined direction of rotation and having a predetermined outer diameter, a motor for driving the fan wheel, which is provided with a motor winding, and a fan housing, which has a with an air inlet opening and an air outlet opening provided pressure chamber is formed, in which at least the fan is arranged, wherein the pressure chamber with a fan surrounding, at least partially spiral outer wall is provided, which has at least three merge into each other spiral sections.
  • the object of the present invention is achieved by a radial fan with a spiral housing according to claim 1.
  • a radial fan with a spiral housing according to claim 1 by improving the ratio of the spiral radii of the spiral housing to the outer diameter of the fan wheel, an improved efficiency of the radial fan and an increased air output can be achieved at approximately constant dimensions of the spiral housing.
  • an improvement in the efficiency can also be achieved by the appropriately defined blades.
  • the terms left, right, up and down refer to the respective drawing figure, and may vary from one drawing figure to the next, depending on a particular orientation (portrait or landscape). Identical or equivalent parts are denoted by the same reference numerals in the various figures and usually described only once.
  • Fig. 1 shows an exemplary radial fan 100, which, for example, is suitable for applications in the automotive industry and according to one embodiment at least partially made of plastic z. B. trained by means of plastic syringes
  • Fan housing 110 has. This example consists of an upper housing portion 112 and a lower housing portion 114. On the upper housing portion 112 are illustratively fastening members 131, 136 for securing the fan housing 110 in or on an external object, for. In an automobile. At the lower housing portion 114, a pot-like extension 104 is formed by way of example.
  • the upper and lower housing portion 112, 114 are z. B. via associated fasteners 111, 116 attached to each other. These are illustratively designed to form a latching connection between the upper and lower housing sections 112 and 114, respectively. Alternatively or additionally, the upper and lower housing portion 112, 114 z. B. also screwed together, glued, welded, riveted, etc. be.
  • the fan housing 110 forms according to one embodiment of a provided with an air inlet opening 115 and an air outlet opening 117 pressure chamber 113, which is provided with an at least partially spiral outer wall 119.
  • at least one fan wheel 142 for generating an air flow 198 is arranged such that the spiral-shaped outer wall 119 surrounds the fan wheel 142 at least in sections.
  • This is rotatable about an associated axis of rotation 149 in a predetermined direction of rotation 199 and has a plurality of fan blades, of which only five are provided with the reference numerals 181, 182, 183, 184, 185.
  • the fan blades are also called blades in centrifugal fans.
  • the axis of rotation 149 is here aligned at least approximately coaxially with the air inlet opening 115 and at least approximately perpendicular to the air outlet opening 117.
  • the fan blades 181, 182, 183, 184, 185 are fastened to an annular carrier 144 at their axial ends facing the air inlet opening 115. As seen in the direction of rotation 199, the fan blades 181, 182, 183, 184, 185 are curved, in particular curved forward or convex, so that the radial fan 100 can also be referred to as a "drum rotor".
  • Fig. 2 shows the radial fan 100 of Fig. 1 during its assembly.
  • a bottom wall 280 provided with a bearing tube 282 is illustratively formed in the pot-like extension 104 of the lower housing section 114.
  • a printed circuit board 270 populated with electronic components 275 is preferably arranged at least substantially centered on the bearing tube 282.
  • the electronic components 275 serve z.
  • the inner stator 230 is placed on the bearing tube 282 above the circuit board 270, wherein the inner stator 230 z. B. is attached to the circuit board 270 and the motor winding 132 z. B. electrically conductive with the circuit board 270 or one or more of the arranged thereon, electronic components 275 is connected.
  • the outer rotor 240 is mounted on the bearing tube 282 via a suitable bearing arrangement such that the rotor shaft 242 is rotatably received in the bearing tube 282 at least in the direction of rotation 199 of the fan wheel 142.
  • the fan wheel 142 is attached to the rotor shaft 242.
  • the axial ends of the fan blades 181, 182, 183, 184, 185 facing away from the annular support 144 are illustratively fastened to a rotor bell 244, which can be fastened to the rotor shaft 242.
  • a rotor bell 244 On the inner circumference of this rotor bell 244 z.
  • the upper housing portion 112 is then placed on the lower housing portion 114 and attached via the fasteners 111, 116 thereto.
  • additional fastening elements 211, 214, 216 are illustratively formed on the lower housing section 114.
  • Fig. 3 shows the provided with the fan housing 110 radial fan 100 of Fig. 1 and 2 , which the air flow 198 of Fig. 1 generated.
  • Fig. 2 illustrates the entering through the air inlet opening 115 in the fan housing 110 and exiting through the air outlet opening 117 from the fan housing 110 air flow 198, and the arrangement of the guide plate 270 in the provided with the bottom wall 280, pot-like extension 104 of the lower housing portion 114th
  • Fig. 4 shows that with the attached to the annular support 144 fan blades 181, 182, 183, 184, 185 of Fig. 1 and 2 provided fan 142 of Fig. 1 and 2 , which in the region of the air inlet opening 115 of the upper housing portion 112 of the pressure chamber 113 forming the fan housing 110 of Fig. 1 to 3 is arranged.
  • the fan wheel 142 has, for example, a predetermined outer diameter D, cf. Fig. 5 ,
  • clarified Fig. 4 the fan wheel 142 enclosing, at least partially spiral outer wall 119 of the pressure chamber 113th
  • the spiral-shaped outer wall 119 has at least three spiral sections 411, 412, 413 merging into one another.
  • the air outlet opening 117 of the fan housing 110 is formed, for example, between an initial region 421 of a first spiral section 411 and an end region 423 of a third spiral section 413.
  • the first spiral section 411 merges at a point 471 into a second spiral section 412, which in turn illustratively merges into the third spiral section 413 at a point 473.
  • each of the spiral sections 411, 412, 413 runs along an associated circle 431, 432 or 433, which has a respectively assigned spiral radius 401, 402, 403.
  • the first spiral section 411 is assigned a first spiral radius 401, which is predetermined from a range from approximately 0.65 times to approximately 0.6825 times the outer diameter D.
  • the second spiral section 412 is associated with a second spiral radius 402, which is defined from a range of about 0.725 times to about 0.7825 times the outer diameter D.
  • the third spiral section 413 is assigned a third spiral radius 403, which is defined from a range of about 0.8375 times to about 0.895 times the outside diameter D.
  • the first spiral radius 401 is set at a outside diameter D of 40 mm from a range of about 26 mm to about 27.3 mm
  • the second spiral radius 402 is set from a range of about 29 mm to about 31.3 mm
  • the third Spiral radius 403 is set from a range of about 33.5 mm to about 35.8 mm.
  • the first spiral radius is preferably approximately 27 mm
  • the second spiral radius 402 approximately 30 mm
  • the third spiral radius 403 approximately 34.5 mm.
  • each of the circles 431, 432, 433 has a circle center 441, 442 and 443, respectively.
  • the circle centers 441, 442 and 443 lie at mutually different locations to have the transitions between the circle sections at locations with substantially the same tangent, and thus to avoid or reduce kinks between the circle sections.
  • the circle centers 441, 442 and 443 preferably lie on a corner 451, 452 and 453, respectively, of a rectangle 450.
  • the circle 431 formed with the spiral radius 401 has a circle center 441 which is associated with a corner 451 of the rectangle 450.
  • the circle 432 formed with the spiral radius 402 has a circle center 442, which is associated with a corner 452 of the rectangle 450.
  • the circle 433 formed with the spiral radius 403 has a circle center 443, which is associated with a corner 453 of the rectangle 450.
  • the circle center points 441, 442, 443 correspond in the direction of rotation 199 of the fan wheel 142 to successive corners 451, 452 and 453 of the rectangle 450.
  • the rectangle 450 has a first side 463 with a first length L1 between two corners 452, 453 associated with the second and third spiral sections 412, 413, respectively. Between two first and second spiral sections 411, 412 associated corners 451 and 452, a second side 461 is arranged, which has a second length L2.
  • the first length L1 preferably has at least approximately 1.5 times the second length L2.
  • the ratio L1 / L2 is preferably in the range of 1.3 to 1.7 or more precisely in the range of 1.300 to 1.700.
  • Fig. 5 shows the fan 142 of Fig. 1 .
  • Fig. 2 and Fig. 4 comprising the fan blades 181, 182, 183, 184, 185 affixed to the annular support 144 and a top wall 544 of the rotor bell 244.
  • In the top wall 544 is an example of an opening 542 for receiving the rotor shaft 242 of the motor 120 of Fig. 2 intended.
  • the structure of the curved fan blades 181, 182, 183, 184, 185 is described below using the example of the curved fan blade 182.
  • This illustratively has an edge 582 facing the rotation axis 149 of the fan wheel 142 and an edge 584 facing the annular support 144.
  • the edges 582, 584 are rounded off by way of example.
  • a straight connecting line 585 between the edges 582, 584 has a length L3, which is predetermined from a range from about 0.16 times to about 0.195 times the outer diameter D. Accordingly, the length L3 is given at an outer diameter D of 40 mm from a range of 5.5 mm to 8 mm and is for example about 6.69 mm.
  • a fictitious extension 586 of the connecting line 585 with a tangent 587 of the fan wheel 142, which is applied to the edge 584 of the fan blade 182, preferably includes an angle ⁇ from a range of about 48 ° to 58 °. For example, the angle ⁇ at the length L3 of 6.69 mm is about 53.8 °.
  • Fig. 6 shows an exemplary fan 642, which instead of the fan 142 of Fig. 1 . 2 . 4 and 5 for the realization of the fan 100 of Fig. 1 and 2 Application can be found.
  • the fan 642 illustratively has a plurality of curved fan blades, of which only five are exemplified for simplicity and clarity of the drawing by reference numerals 681, 682, 683, 684, 685. These are attached to an annular support 644 and a top wall 645 of a rotor bell 646. In the top wall 544 is an example of an opening 648, z. B. for receiving the rotor shaft 242 of the motor 120 of Fig. 2 intended.
  • the structure of the fan blades 681, 682, 683, 684, 685 is described below using the fan blade 682 as an example.
  • This illustratively has an edge 692 facing the axis of rotation 149 of the fan wheel 642 and an edge 694 facing the annular carrier 644.
  • the edges 692, 694 are rounded off by way of example.
  • a straight connecting line 695 between the edges 692, 694 has a length L4 which, like the length L3 of FIG Fig. 5 from a range of about 0.16 times to about 0.195 times the outer diameter D is given. Accordingly, the length L4 as the length L3 is given at an outer diameter D of 40 mm from a range of about 5.5 mm to about 8 mm, compared to the length L3 of Fig. 5 however, by way of example about 7.58 mm.
  • a fictitious extension 696 of the connection line 695 closes with a tangent 697 of the fan impeller 642, which is applied to the edge 694 of the fan blade 682, again as in FIG Fig. 5 prefers an angle ⁇ from a range of about 48 ° to about 58 °.
  • the angle ⁇ at the length L4 of 7.58 mm is preferably approximately 52.8 °.
  • Fig. 7 shows a comparison diagram 700 with dimensionless characteristics to illustrate an improvement of the fan housing 110 of Fig. 1 to 4 or the air flow characteristics of the fan housing 110.
  • a diagram is also referred to by the person skilled in the art as a dimensionless fan characteristic curve.
  • Abscissa horizontal axis
  • the flow coefficient flow coefficient
  • pressure coefficient pressure coefficient
  • a first characteristic 710 illustrates the characteristics associated with the radial fan 100 of FIG Fig. 1 to 3 and the fan housing 110
  • a second characteristic 720 illustrates the characteristics of a conventional prior art radial fan with spiral housing.
  • FIG. 2 shows a comparison diagram 800 with dimensionless characteristic numbers (dimensionless fan characteristic curve corresponding to FIG Fig. 7 ) to illustrate an improvement of the fan 142 of Fig. 1 to 5 , or the air flow characteristics of the fan wheel 142.
  • a first characteristic 810 illustrates the characteristics associated with the fan wheel 142 of FIG Fig. 1 to 5 and the fan housing 110 in the radial fan 100 of Fig. 1 to 3 can be reached while a second characteristic 820 illustrates the characteristics of a conventional, known from the prior art fan of a centrifugal fan with spiral housing.
  • FIG. 11 shows a comparison diagram 900 for illustrating an improvement in the efficiency of the fan housing 110 of FIG Fig. 1 to 4 provided centrifugal fan 100 of Fig. 1 to 3 compared to a conventional volute fan provided with a volute casing.
  • an abscissa 902 records a volume flow in m 3 / h that can be generated with the respective radial runner and an assigned efficiency% on an ordinate 904.
  • a first characteristic 910 illustrates the efficiency of the radial fan 100
  • a second characteristic 920 illustrates the efficiency of a prior art spiraled conventional radial fan.
  • the radial fan 100 has a significantly better efficiency, at least over wide volume flow ranges.
  • Fig. 10 shows a comparison diagram 1000 with dimensionless characteristics psi 1004 and phi 1002 (dimensionless fan characteristic corresponding Fig. 7 and Fig. 8 ) to illustrate an improvement of the fan wheel 142 and the volute casing 110 of Fig. 1 to 5
  • a first characteristic 1010 illustrates the characteristics associated with the fan wheel 142 and the volute casing 110 of FIG Fig. 1 to Fig. 5 and the fan housing 110 in the radial fan 100 of Fig. 1 to 3 can be reached (“inventive fan”)
  • a second characteristic 1020 the characteristics of a conventional, known from the prior art fan with fan and volute casing (“known fan”) illustrates.
  • the fan wheels had an outer diameter of 40 mm and thus comparable sizes.
  • FIG. 11 shows a comparison diagram 1100 for the measurements Fig. 10 used fan, in which the volumetric flow in the unit m 3 / h is indicated on the abscissa 1102.
  • the pressure increase ⁇ p f is indicated in Pa.
  • the curve 1121 shows the pressure increase for the fan according to the invention, and the curve 1122 shows the pressure increase for the known fan.
  • the pressure increase is the area of the fan according to the invention partially larger than the known fan.
  • the efficiency 1104 of the engine in the free blow-out state is indicated in%.
  • the curve 1111 shows the efficiency of the fan according to the invention
  • the curve 1112 shows the efficiency of the known fan.
  • the efficiency of the fan according to the invention is in the maximum at about 19%, that of the known fan in the maximum at about 10%. The efficiency of the fan according to the invention is thus significantly better, and this saves energy.
  • a radial fan 100 which comprises: a fan wheel 142, which is rotatable about an associated rotation axis 149 in a predetermined direction of rotation 199 and has a predetermined outer diameter D; a motor 120 for driving the fan wheel 142, which motor 120 is provided with a motor winding 132; a fan housing 110 which forms a pressure chamber 113 provided with an air inlet opening 115 and an air outlet opening 117, in which at least the fan wheel 142 is arranged; wherein the pressure chamber 113 is provided with a fan wall 142 enclosing, at least partially spiral outer wall 119 having at least three merge into each other spiral sections 411, 412, 413, wherein a first spiral section 411, a first spiral radius 401 is assigned, which from a range of 0 , 65 times to 0.6825 times the outer diameter D is given, a second spiral portion 412 a second spiral radius 402 is assigned, which is given from a range of 0.725 times to 0.7825 times
  • each of the spiral sections 411, 412, 413 extends along a circle 431, 432, 433, which has the respectively assigned spiral radius 401, 402, 403, wherein each of the circles 431, 432, 433 has a circle center 441, 442, 443.
  • the circle centers 441, 442, 443 of the spiral sections 411, 412, 413 lie at mutually different locations.
  • the circle centers of the spiral sections 411, 412, 413 each lie on a corner 451, 452, 453 of a rectangle 450.
  • the circle centers 441, 442, 443 in the direction of rotation 199 of the fan wheel 142 preferably correspond to successive corners 451, 452, 453 of the rectangle 450.
  • the rectangle 450 preferably has a first side 463 with a first length L1 between two corners 452, 453 assigned to the second and third spiral sections 412, 413, and a second side between two corners 452, 451 assigned to the second and first spiral sections 412, 411 461 having a second length L2, wherein the ratio of the first length L1 to the second length L2 is in the range of 1.3 to 1.7.
  • the second length L2 is in the range of 2.8 mm to 3.2 mm, more preferably 3 mm.
  • the connecting line 585 has a length L3 of 6.69 mm and the first angle ⁇ is 53.8 °.
  • the connecting line 695 has a length L4 of 7.58 mm and the first angle ⁇ is 52.8 °.
  • the outer diameter D is 40 mm.
  • the first spiral radius 401 is 27 mm
  • the second spiral radius 402 is 30 mm
  • the third spiral radius 403 is 34.5 mm.
  • the air outlet opening 117 is preferably formed between an initial region 421 of the first spiral section 411 and an end region 423 of the third spiral section 413.
  • the air inlet opening 115 is at least approximately aligned coaxially with the axis of rotation 149 of the fan wheel 142, and the air outlet opening 117 extends in a plane which is aligned at least approximately perpendicular to the axis of rotation 149 of the fan 142.
  • the length L3 of the connecting line 585 is predetermined from a range of 5.5 mm to 8 mm.
  • the figures and the description also show a fan housing 110 for a radial fan 100, which has a fan wheel 142 and a motor 120 provided with a motor 132 for driving the fan wheel 142, which fan wheel 142 is rotatable about an associated axis of rotation 149 and a predetermined outer diameter D.
  • fan housing 110 forms a pressure chamber 113 provided with an air inlet opening 115 and an air outlet opening 117, in which at least the fan wheel 142 is arranged, wherein the pressure chamber 113 is provided with an outer wall 119 surrounding the fan wheel 142, at least partially spiraling, which merges at least three into one another Spiral sections 411, 412, 413, wherein a first spiral portion 411, a first spiral radius 401 is assigned, which is specified from a range of 0.65 times to 0.6825 times the outer diameter D, a second spiral portion 412, a second spiral radius 402, which is set from a range of 0.725 times to 0.7825 times the outer diameter D, and a third spiral portion 413 is associated with a third spiral radius 403, which ranges from 0.8375 times to 0.895 times the outer diameter D is given.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP13180009.6A 2012-08-14 2013-08-10 Ventilateur radial avec boîtier à spirale Withdrawn EP2698542A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102012107441.0A DE102012107441B4 (de) 2012-08-14 2012-08-14 Radiallüfter mit Spiralgehäuse

Publications (2)

Publication Number Publication Date
EP2698542A2 true EP2698542A2 (fr) 2014-02-19
EP2698542A3 EP2698542A3 (fr) 2017-07-12

Family

ID=48979595

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13180009.6A Withdrawn EP2698542A3 (fr) 2012-08-14 2013-08-10 Ventilateur radial avec boîtier à spirale

Country Status (2)

Country Link
EP (1) EP2698542A3 (fr)
DE (1) DE102012107441B4 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPWO2015140963A1 (ja) * 2014-03-19 2017-04-06 三菱電機株式会社 遠心送風機
CN107477678A (zh) * 2017-08-25 2017-12-15 郑州凌达压缩机有限公司 风道结构和空调器

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE429255B (sv) * 1975-06-13 1983-08-22 Warman Int Ltd Hus och foder for centrifugalpumpar av snecktyp
EP0112932B1 (fr) * 1982-12-29 1985-06-05 Wilhelm Gebhardt GmbH Ventilateur radial avec des aubes profilées courbées en arrière
DE4310467A1 (de) * 1993-03-31 1994-10-06 Klein Schanzlin & Becker Ag Topfgehäusepumpe
DE10314425B4 (de) * 2002-06-22 2005-06-16 Tuchenhagen Gmbh Leitvorrichtung für ein in Blechbauweise ausgeführtes Gehäuse einer Kreiselpumpe
US20080267774A1 (en) * 2007-04-27 2008-10-30 Shih-Ci Lian Curvature of inner wall for blowing machine
WO2009143920A1 (fr) * 2008-05-27 2009-12-03 Ebm-Papst St. Georgen Gmbh & Co. Kg Ventilateur radial
CN102536896A (zh) * 2012-03-22 2012-07-04 安徽安风风机有限公司 一种离心风机的叶片

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPWO2015140963A1 (ja) * 2014-03-19 2017-04-06 三菱電機株式会社 遠心送風機
CN107477678A (zh) * 2017-08-25 2017-12-15 郑州凌达压缩机有限公司 风道结构和空调器

Also Published As

Publication number Publication date
DE102012107441A1 (de) 2014-02-20
EP2698542A3 (fr) 2017-07-12
DE102012107441B4 (de) 2016-05-25

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