EP4148279A1 - Élément guide d'écoulement pour un ventilateur radial, axial ou diagonal et ventilateur radial ou diagonal pourvu d'élément guide d'écoulement - Google Patents

Élément guide d'écoulement pour un ventilateur radial, axial ou diagonal et ventilateur radial ou diagonal pourvu d'élément guide d'écoulement Download PDF

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Publication number
EP4148279A1
EP4148279A1 EP22194087.7A EP22194087A EP4148279A1 EP 4148279 A1 EP4148279 A1 EP 4148279A1 EP 22194087 A EP22194087 A EP 22194087A EP 4148279 A1 EP4148279 A1 EP 4148279A1
Authority
EP
European Patent Office
Prior art keywords
rotor
flow
axial
radial
closing part
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
EP22194087.7A
Other languages
German (de)
English (en)
Inventor
Erhard Gruber
Reinhard Strohmeier
Michael Strehle
Jens Müller
Thineshan Sri Kanthavel
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 Mulfingen GmbH and Co KG
Original Assignee
Ebm Papst Mulfingen 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 Mulfingen GmbH and Co KG filed Critical Ebm Papst Mulfingen GmbH and Co KG
Publication of EP4148279A1 publication Critical patent/EP4148279A1/fr
Pending 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
    • F04D29/40—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
    • F04D29/02—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
    • F04D29/08—Sealings
    • F04D29/16—Sealings between pressure and suction sides
    • F04D29/161—Sealings between pressure and suction sides 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
    • F04D29/4213—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
    • F04D29/42—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

Definitions

  • the invention relates to a flow guide element for a radial, axial or diagonal fan and a radial, axial or diagonal fan which has a flow guide element.
  • a centrifugal fan with a flow control element is, for example, from DE 42 18 826 A1 known.
  • the flow guide element is set up to guide an inlet flow on the suction side of the radial fan to the rotor of the radial fan.
  • the rotor is arranged at a distance from the flow guide element. As a result, the rotor can rotate relative to the flow guide element without friction.
  • the flow control element has at In one embodiment, a flow part and a closing part made of materials with different hardnesses.
  • the flow guide element preferably consists of these two parts.
  • the flow part and the closing part can be connected to one another during and through the production of the flow guide element, for example by a two-component casting process, in particular an injection molding process.
  • the flow part and the closing part can be produced and connected to one another.
  • the respective other part is then produced by a casting process and is thereby connected to the flow part or the closing part.
  • the flow part and the closing part consist of the same material.
  • the flow part surrounds a flow channel.
  • the flow portion alone may delimit the flow channel, or alternatively, the flow portion and the closing portion may jointly delimit the flow channel.
  • the closing part is arranged on an end section of the flow element.
  • the closing part is set up to provide a closing edge or a closing surface for a rotor and in particular a centrifugal ring of the rotor of the radial, axial or diagonal fan, on which the rotor of the radial, Axial or diagonal fan applied or the rotor can be opposite with a small gap width.
  • the final part - and optionally also the flow part - consists or consist of a material whose hardness is less than the hardness of the material of the rotor of the radial or diagonal fan.
  • the hardness of the material of the end part can be less than the hardness of the material of the flow part.
  • the rotor of the centrifugal, axial or diagonal fan can be in rubbing contact with the end part when it is first started up and can grind into the end part during an initial operating phase of the centrifugal, axial or diagonal fan.
  • the gap width between the rotor and the closing part can be chosen to be very small during commissioning, for example a maximum of 1.0 mm or a maximum of 0.5 mm.
  • the ratio of the gap width to an intake diameter of the radial, axial or diagonal fan can be in a range from 0 to 0.01 inclusive.
  • the ratio of the gap width to an intake diameter can preferably be in a range from 0 to 0.006 inclusive.
  • the flow part of the flow element can consist of a metallic alloy or of plastic.
  • At least the closing part - and optionally also the flow part - consists of plastic, in particular of an elastic plastic, such as an elastomer or a thermoplastic elastomer. Materials containing rubber, preferably synthetic rubber, can also be used.
  • the final part - and optionally also the flow part - consists of a material that has a maximum hardness of 80 or 90 Shore D or 80 or 90 Shore A.
  • the hardness is preferably determined in accordance with DIN EN ISO 868 or DIN ISO 7619-1 or ASTM D2240-00.
  • the radial, axial or diagonal fan according to the invention preferably has a centrifugal ring and has a motor and a rotor which is mounted so as to be rotatable about an axis of rotation.
  • the rotor can be driven by the motor.
  • Fan blades are arranged on the rotor, at a Rotation of the rotor around the axis of rotation generate a gas flow.
  • a flow element is arranged upstream of the rotor.
  • the flow element can be designed in accordance with one of the exemplary embodiments described above.
  • the flow guide element of the radial, axial or diagonal fan according to the invention has a flow part and a closing part.
  • the end portion is located immediately adjacent to the rotor.
  • the end part consists of a material which has a lower hardness than the material of the entire rotor or at least the portion of the rotor which is arranged adjacent to the end part.
  • the closing part consists of a material that has a lower hardness than the material of the flow part.
  • the material of the flow part can be selected independently of the end part according to other required properties independent of the hardness, such as weight, manufacturing costs, thermal thermal expansion, etc.
  • a gap can be set between the closing part and the rotor during commissioning, which gap has, for example, a small gap width of at most 1.0 mm or at most 0.5 mm.
  • the ratio of the gap width to an intake diameter of the radial, axial or diagonal fan is preferably in a range from 0 to 0.01 inclusive.
  • the gap width can be measured perpendicular to the flow direction of a flow through the gap.
  • the gap width can thus be defined by the distance between the rotor and the closing part in a cross-sectional plane through the gap.
  • the termination portion may abut a leading edge or face of the rotor.
  • the front face or edge is generally oriented in an axial direction parallel to the axis of rotation.
  • the front edge or front surface can be planar, for example, or can have a convexly curved course.
  • the front edge or front surface connects an inner surface, which faces the axis of rotation, with an outer surface, which faces away from the axis of rotation.
  • the inner surface and the outer surface can, for example, be arranged concentrically to one another.
  • the end portion may abut an inner edge or surface of the rotor.
  • the inner edge or surface may face the axis of rotation of the rotor.
  • the closing part prefferably bear against an outer edge or an outer surface of the rotor which faces away from the axis of rotation.
  • the centrifugal, axial or diagonal fan can be, for example, a backward-curved centrifugal fan or an axial fan or a diagonal fan with a centrifugal ring.
  • the fan blades of the rotor extend in a curved manner from an inner edge outwards to an outer edge in relation to a radial plane which has the axis of rotation. The curvature is directed against the direction of rotation of the rotor.
  • the outer edge may be located behind the inner edge of the fan blade in the direction of rotation.
  • figure 1 a schematic representation of the noise of the radial, axial or diagonal fan according to the invention compared with a radial fan according to the prior art, each depending on the volume flow.
  • the invention is suitable for use in or with a centrifugal, axial or diagonal fan.
  • the invention is explained below based on an exemplary embodiment in connection with a radial fan 15 and can also be used, for example, in a diagonal fan with a centrifugal ring.
  • FIG 1 an exemplary embodiment of the radial fan 15 is shown schematically in a sectional view along an axis of rotation R.
  • the radial fan 15 has a rotor 16 which is mounted so that it can rotate about the axis of rotation R.
  • the rotor 16 can be driven by a motor 17 to rotate about the axis of rotation R.
  • the rotor 16 has a back 18 and a front 19. On the back 18, the rotor 16 has a connecting element 20 which is connected to the rotor of the motor 17 in a rotationally fixed manner.
  • the connecting element 20 can be a connecting ring 21, for example.
  • the rotor 16 In an axial direction A parallel to the axis of rotation R, the rotor 16 has a slinger 22 at a distance from the connecting ring 21, which encloses the axis of rotation R coaxially. Between the connecting ring 21 and the thrower ring 22, a plurality of fan blades 23 distributed in the circumferential direction around the axis of rotation R extend. The shape and size of the fan blades 23 can vary.
  • the exemplary embodiment is a backward-curved radial fan 15.
  • the fan blades 23 extend in a curved manner about the axis of rotation R in the direction of rotation of the rotor 16.
  • the fan blades 23 each have an inner edge arranged radially on the inside relative to the axis of rotation R and an outer edge arranged radially on the outside. In the direction of rotation about the axis of rotation R of the rotor 16, the outer edge can be arranged further back than the inner edge of each fan blade 23.
  • the inner edges of the fan blades 23 are arranged at a distance from the axis of rotation R.
  • the radial fan 15 has a flow guide element 27 upstream of the rotor 16 in the direction of flow.
  • the flow guide element 27 is set up to guide an inlet flow or suction flow of the radial fan towards the rotor 16 .
  • the minimum inside diameter of the flow guide element 27 corresponds, for example, to an intake diameter d.
  • the suction flow in the area is radially inside Fan blades 23 passed and given a rotation of the rotor 16 tangential to the direction of rotation of the rotor 16 in an outlet channel, not shown, of a housing.
  • the flow guide element 27 has an end section 28 which is arranged downstream and which is assigned to the rotor 16 of the radial fan 15 .
  • the rotor 16 is positioned adjacent to the end portion 28 .
  • the transition area following the end section 28 of the flow guide element 27 and the rotor 16 is in figure 1 marked with X and for different embodiments schematically in the Figures 2-8 shown.
  • the flow guide element 27 has a flow part 29 and a closing part 30. At least the flow part 29 delimits a flow channel 31 through which the intake flow can flow. In some exemplary embodiments of the flow guide element 27 , the flow channel 31 can also be delimited jointly by the flow part 29 and the closing part 30 .
  • the flow part 29 and the closing part 30 consist of different materials.
  • the hardness of the material of the closing part 30 can then be less than the hardness of the material of the flow part 29.
  • the flow part 29 can consist of a metallic alloy or plastic, for example.
  • the closing part 30 preferably has a maximum hardness of 80 to 90 Shore-D or 80 to 90 Shore-A.
  • the hardness can be determined according to DIN EN ISO 868 or DIN ISO 7619-1 or ASTM D2240-00.
  • the hardness of the material of the rotor 16 or at least of the centrifugal ring 22 is greater than the hardness of the material of the closing part 30. This makes it possible to arrange the rotor 16 and, for example, the centrifugal ring 22 in contact with the closing part 30 when the radial fan 15 is started up, see above that the rotor 16 or the centrifugal ring 22 grinds into the closing part 30 during a first operating phase of the radial fan 15 . Material is removed from the closing part 30 by the grinding and the closing surface lying against the rotor adapts to the contour of the lying surface of the rotor 16 .
  • the rotor 16 can be installed opposite the closing part 30 in such a way that a gap width w of a gap 32 between the rotor 16 (for example the slinger 22) and the closing part 30 is, for example, a maximum of 1.0 mm and preferably a maximum of 0.5 mm .
  • a gap width w of a gap 32 between the rotor 16 (for example the slinger 22) and the closing part 30 is, for example, a maximum of 1.0 mm and preferably a maximum of 0.5 mm .
  • the ratio of the gap width w to the suction diameter d 0 ⁇ w/d ⁇ 0.01, in particular 0 ⁇ w/d ⁇ 0.0006.
  • An embodiment with a gap 32 between the closing part 30 and the thrower ring 22 is in figure 3 shown.
  • the following can apply for the ratio of the gap width w to an intake diameter d, for example: 0 ⁇ w/d ⁇ 0.01.
  • the slinger 22, and preferably the entire rotor 16 may be made of a metallic alloy, a plastic, a composite material, or a combination thereof.
  • the shape of the centrifugal ring 22 can vary depending on the design of the rotor 16 or the radial fan 15 .
  • the slinger 22 is not just a plate-shaped, three-dimensional body that extends in a radial direction R and in the axial direction A with respect to the axis of rotation R.
  • the slinger 22 has a front surface 35 at the front 19 of the rotor, which can also be referred to as a front edge.
  • the front surface 35 connects an inner surface 36 of the slinger 22 facing the axis of rotation R with an outer surface 37 of the slinger 22 facing away from the axis of rotation R.
  • the inner surface 36 in the exemplary embodiment Adjacent to the front surface 35, the inner surface 36 in the exemplary embodiment has a front section 38, which extends essentially in the axial direction A extends. Additionally or alternatively, the outer surface 37 can have a front section 39 adjoining the front surface 35 which essentially extends in the axial direction A. Basically, the course of the inner surface 36 and the outer surface 37 can be selected as desired depending on the application.
  • the front surface 35 has a convexly curved course and can be formed, for example, by a radiused front edge.
  • the front surface 35 can also be a planar surface.
  • the closing part 30 rests against the front surface 35 .
  • the width of the closing part 30 can essentially correspond to the width of the adjoining flow part 29 and/or the front surface 35 .
  • the front surface 35 has ground into the closing part 30 and formed a concave depression there.
  • the transition between the flow guide element 27 and the rotor 16 is essentially gap-free. Leakage flows between the flow guide element 27 and the rotor 16 and specifically between the closing part 30 and the thrower ring 22 can be completely or almost completely avoided.
  • the embodiment after figure 3 corresponds essentially to the exemplary embodiment figure 2 .
  • the difference is that there is a gap 32 between the flow guide element 27 and the rotor 16, in particular between the closing part 30 and the thrower ring 22.
  • the gap width w is measured at right angles to the direction of flow through the gap 32 and, for example, at right angles to the front surface 35.
  • the Gap width w can be chosen to be very small, preferably a maximum of 0.5 mm.
  • the surfaces delimiting the gap 32 can also have any other shape and, for example, be planar surfaces which extend at right angles or at an angle to the axis of rotation R.
  • FIG 4 a modified embodiment of the flow guide element 27 is shown.
  • the flow guide element 27 has a diameter in the end section 28 which is at most as large as the inside diameter of the front section 38 of the inner surface 36.
  • the closing part 30 of the flow guide element 27 rests against the front section 38 of the inner surface 36 or can alternatively form a Gap opposite to the front portion 38 of the inner surface 36 may be arranged.
  • the closing part 30 bears against the inner surface 36 at a point which is arranged at a distance from the front surface 35 .
  • FIG. 5 shows figure 5 an exemplary embodiment in which the closing part 30 of the flow guide element 27 has an outer diameter which, at least after grinding, corresponds at most to the inner diameter of the inner surface 36 or the front section 38 of the inner surface 36 .
  • the closing part 30 lies against the thrower ring 22 along a surface that extends in the axial direction A and is longer in the axial direction A than in the exemplary embodiment according to FIG figure 4 .
  • the contact surface extends up to the transition of the front section 38 of the inner surface 36 into the front surface 35. In this embodiment, a very good seal and at the same time a good flow pattern in the transition area between the flow guide element 27 and the rotor 16 can be achieved.
  • the closing part 30 forms an extension of the flow part 29 in the end section 28 and is connected to the flow part 29 in the direction of flow.
  • the final part 30 can form a ply or layer, which is applied to the flow part 29 in the end section 28, as is highly schematized in FIGS figures 6 and 7 is shown.
  • the final part 30 can have an outer layer 40 ( figure 6 ) or an inner layer 41 ( figure 7 ) form.
  • the outer layer 40 is arranged on the side of the flow part 29 facing away from the axis of rotation R and therefore outside of the flow channel 31 .
  • the inner layer 41 is arranged inside the flow channel 31, on the side of the flow part 29 facing the axis of rotation R.
  • the end portion 30 may cooperate with and abut or oppose the front surface 35 and the inner surface 36 and optionally the outer surface 37 to form the gap 32 .
  • the embodiment according to figure 5 with the embodiment according to figure 3 be combined and thereby an embodiment according to figure 8 be obtained.
  • the embodiment according to figure 8 in contrast to the exemplary embodiment figure 5 there is no contact between the closing part 30 and the thrower ring 22. Rather, there is a gap here, similar to the exemplary embodiment shown in FIG figure 3 .
  • the gap 32 has a gap width w and is different than in the embodiment according to figure 3 no axial gap, but a radial gap.
  • the gap 32 is in accordance with the embodiment figure 8 formed between the end piece 30 and the front section 38 .
  • curves K1 to K6 are shown schematically as a function of the volume flow Q of the radial fan 15.
  • the curves K1, K3, K5 correspond to an exemplary embodiment of the radial fan 15 according to the present invention, with the centrifugal ring 22 resting on the closing part 30 essentially without a gap.
  • Curves K2, K4, K6 represented by dashed lines belong to a radial fan according to the prior art, which has a gap of about 3.0 mm between the rotor and the flow guide element.
  • figure 8 shows a first curve K1, which represents the static overall efficiency of the radial fan 15 according to the invention.
  • a second curve K2 the overall efficiency in the radial fan according to the prior art is shown in dashed lines.
  • the overall efficiency can be improved by approximately 4% to 5% by an embodiment according to the invention.
  • figure 10 is shown in a third curve K3 and a fourth curve K4 in each case the differential pressure p between the suction and pressure side of the radial fan as a function of the volume flow Q.
  • the third curve K3 shows the course of the differential pressure of the exemplary embodiment of the radial fan according to the invention and the fourth curve K4 for a radial fan according to the prior art.
  • figure 11 shows schematic noise development of the exemplary embodiment of the radial fan according to the invention (fifth curve K5) and of the radial fan according to the prior art (sixth curve K6), with a sound power L depending on the volume flow Q being shown. It can be seen that the sound power in the exemplary embodiment according to the invention is significantly lower than in the prior art, for example down to 1.6 dbA.
  • the invention relates to a flow guide element 27 and a radial, axial or diagonal fan with such a flow guide element 27.
  • the flow guide element 27 has a flow part 29 and a closing part 30.
  • the closing part 30 works together with a section of the rotor 16 of the radial, axial or diagonal fan, which is arranged directly adjacent to a downstream end section 28 of a flow channel 31 delimited by the flow part 29 .
  • This section can be formed, for example, by a centrifugal ring 22 of the rotor 16 .
  • the material of this section of the rotor 16 e.g. centrifugal ring 22
  • the hardness of the flow part 29 can be greater than the hardness of the end part 30.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP22194087.7A 2021-09-08 2022-09-06 Élément guide d'écoulement pour un ventilateur radial, axial ou diagonal et ventilateur radial ou diagonal pourvu d'élément guide d'écoulement Pending EP4148279A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102021123242.2A DE102021123242A1 (de) 2021-09-08 2021-09-08 Strömungsleitelement für einen Radial-, Axial- oder Diagonalventilator und Radial- oder Diagonalventilator mit Strömungsleitelement

Publications (1)

Publication Number Publication Date
EP4148279A1 true EP4148279A1 (fr) 2023-03-15

Family

ID=83228898

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22194087.7A Pending EP4148279A1 (fr) 2021-09-08 2022-09-06 Élément guide d'écoulement pour un ventilateur radial, axial ou diagonal et ventilateur radial ou diagonal pourvu d'élément guide d'écoulement

Country Status (2)

Country Link
EP (1) EP4148279A1 (fr)
DE (1) DE102021123242A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57120798U (fr) * 1981-01-20 1982-07-27
DE4218826A1 (de) 1992-06-09 1993-12-16 Maico Elektroapparate Radialventilator
JP2014227891A (ja) * 2013-05-21 2014-12-08 株式会社朝倉機械製作所 遠心送風機
CN105697409A (zh) * 2016-03-23 2016-06-22 湖南巴陵炉窑节能股份有限公司 一种防内泄漏离心式通风机

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006009054B4 (de) 2006-02-27 2007-11-22 Woco Industrietechnik Gmbh Gehäuse für Radialverdichter
DE102007009781B4 (de) 2007-02-27 2009-09-17 Woco Industrietechnik Gmbh Kunststoffverdichtergehäuse sowie Verfahren zu dessen Herstellung
ATE556224T1 (de) 2008-07-10 2012-05-15 Grundfos Management As Pumpe
DE102012217381A1 (de) 2012-09-26 2014-03-27 Bosch Mahle Turbo Systems Gmbh & Co. Kg Radialverdichter für einen Abgasturbolader
US20180283394A1 (en) 2015-02-25 2018-10-04 Otics Corporation Compressor housing for turbocharger
DE102015207800A1 (de) 2015-04-28 2016-11-03 Ziehl-Abegg Se Diagonal- oder Radialventilator, Leiteinrichtung für einen solchen Ventilator und System mit einem solchen Ventilator oder mit mehreren solcher Ventilatoren

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57120798U (fr) * 1981-01-20 1982-07-27
DE4218826A1 (de) 1992-06-09 1993-12-16 Maico Elektroapparate Radialventilator
JP2014227891A (ja) * 2013-05-21 2014-12-08 株式会社朝倉機械製作所 遠心送風機
CN105697409A (zh) * 2016-03-23 2016-06-22 湖南巴陵炉窑节能股份有限公司 一种防内泄漏离心式通风机

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Publication number Publication date
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