CN102536857A - Cooling fan for traction converter of high-speed electric locomotive - Google Patents
Cooling fan for traction converter of high-speed electric locomotive Download PDFInfo
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- CN102536857A CN102536857A CN201010584398XA CN201010584398A CN102536857A CN 102536857 A CN102536857 A CN 102536857A CN 201010584398X A CN201010584398X A CN 201010584398XA CN 201010584398 A CN201010584398 A CN 201010584398A CN 102536857 A CN102536857 A CN 102536857A
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Abstract
The invention relates to a cooling fan for a traction converter of a high-speed electric locomotive. The cooling fan comprises a rectangular box body (5), wherein a clapboard (11) is arranged at the middle of the box body (5) to divide the box body (5) into two independent cavities, a motor (7) is installed at rear side of each cavity, and an air inlet (9) and an air outlet (8) are respectively arranged at the front side and the lower side of each cavity. The cooling fan is characterized in that the rear side of each cavity is connected with the front end of the motor (7), an impeller (4) is arranged in each cavity and is coaxially installed on the output shaft of the motor (7), and two impellers (4) rotate counterclockwise during working so as not to mutually intervene. The cooling fan provided by the invention is mainly used for cooling the traction converters of motor trains with speed per hour of more than 380 km/h, and can satisfy the requirements of resisting low-temperature impact and high-speed vibration.
Description
Technical field
The present invention relates to a kind of blower fan that CRH-380B electric express locomotive traction convertor system is cooled off; Specifically be the pressure that the air quantity that blower fan produces is overcome the whole system resistance of pipe system; And through the radiator in the traction convertor system; Take away the heat that Locomotive Converter when work produces, to guarantee the stable operation of whole electric express locomotive traction convertor system.Being mainly used in speed per hour is the cooling of the above motor train unit train traction convertor of 380kM/h.
Background technique
In October, 2004, China signed a collection of contract that adds wealthy version ICE3 train with SIEMENS, as the operation vehicle of China Railway High-speed (CRH).A little train of contract engagement is directly exported to China by Germany, and most train is assembled in China by Tangshan track bus limited liability company of China northern car group, and is renamed as CRH 3 type Harmony trains.
The CRH3 rail motor set are 4 moving 4 to drag 8 marshalling operations.Rail motor set have good aerodynamic configuration, and its carrying speed is 350kM/h, and the highest speed of experiment is 404kM/h.Main transformer is designed to the transformer of single system, and capacity is 5.6MVA, and main transformer, traction convertor, AuCT take to force the oily circulation air cooling way of guiding, all need dispose cooling system.The low-temperature impact-resistant that this invention is exactly to research and develop for the traction convertor cooling system and the blower fan of anti-vibration at high speed.Domestic blower fan can not satisfy the demand of low-temperature impact-resistant and vibration at high speed at present.
Summary of the invention
The invention discloses the used motor straight connection type double speed centrifugal blower of a kind of CRH-380B motor-car car group traction convertor cooling system; To fill up the vacancy of the high speed per hour power car of domestic CRH-380B group traction convertor cooling system, be significant for realizing its production domesticization with the blower fan independent research.
Technological scheme of the present invention is: a kind of cooling blower of electric express locomotive traction convertor; The casing that comprises rectangle; Centre at this casing is divided into two independently cavitys with dividing plate, at the rear side of each this cavity a motor is housed respectively, is respectively equipped with intake grill and exhaust outlet at the front side and the downside of each this cavity; It is characterized in that: the rear side at each this cavity is connected with the front end of a motor respectively; In each this cavity, respectively be provided with on the output shaft that an impeller and coaxial is installed in motor two separate runnings of impeller, mutual noninterference.
Described impeller is made up of shroud, hub disk and a plurality of blade, and being uniformly distributed along the circumference in the front side of the hub disk of circle connects to the crooked a plurality of blades of equidirectional, and described intake grill is corresponding with this blade; Front side at this impeller is connected with shroud, is connected with the air intake flow-guiding mouth corresponding with this shroud in the inboard of this intake grill; This air intake flow-guiding mouth and shroud are tubaeform, and the osculum end of this air intake flow-guiding mouth is corresponding with the osculum end of this shroud; Adopt welding manner to connect as one between this shroud, hub disk and the blade.
The internal diameter of the osculum end of this air intake flow-guiding mouth and each blade shroud of described impeller around interior diameter of a circle identical or close; The outer of the big opening end of this air intake flow-guiding mouth is provided with flange plate, the edge fixed installation of the intake grill of this flange plate and described casing front side; The corresponding connection of cylindrical front end of the outer of the big opening end of this shroud and each blade of described impeller; The osculum end of this air intake flow-guiding mouth is inserted in the osculum end of this shroud, and the radial clearance δ of the two cooperation is 1.8-2mm, and axially being inserted in size h is 10-11mm.
Described air intake flow-guiding mouth axial cross section is connected to form by osculum arcuate segment and big mouthful of arcuate segment slyness, and the radius of curvature of this big mouthful of arcuate segment is 2～3 times of this osculum arcuate segment radius of curvature; Described shroud axial cross section is connected to form by straightway, big mouthful arcuate segment and osculum arcuate segment slyness successively, and the radius of curvature of this big mouthful of arcuate segment is 2～3 times of this osculum arcuate segment radius of curvature.
The part that described air intake flow-guiding mouth extend in this shroud is the arc extension mouth; The minimum diameter place of the osculum arcuate segment of described air intake flow-guiding mouth is positioned at the top of the osculum end of this shroud; Make that the curvature of osculum arcuate segment of this arc extension mouth and this shroud is basic identical, the air-flow slyness that will flow through the air intake flow-guiding mouth imports in this shroud swimmingly.
Described blade is that the back is to board-like blade by force, and the exit angle a of each blade is 46 degree; The Inlet cone angle b of each blade is 23 degree, and Inlet cone angle b reduces than existing technology, improves effectively acting, reduces power loss.
The mounting flange of described its front end of motor is installed in the rear side of described casing through motor mounting plate; At least be equipped with the cotton layer of eliminating the noise in the front side of described casing and the inner face of the left and right sides.
Described motor is a double-speed motor, realizes the switching of high and low rotating speed through the TEMP control system, so that be fit to the demand of different operating modes, reduces power consumption thereby when guaranteeing the traction convertor radiating effect, control power consumption.
Described impeller and motor mounting plate adopt alloy high strength structural steel low temperature resistant, vibratory impulse to process, and described air intake flow-guiding mouth adopts aluminium sheet to process; Two impellers are when work and are rotated counterclockwise.
Described blade uses the blanking die blanking, and the weight difference of each blade uses the method for staggered symmetry welding less than 0.05kg, and welding speed is identical with electric current, makes welding deformation amount of vane control to minimum; In course of working, guarantee unifying datum, and it is unified to use moulds of industrial equipment control, makes impeller reach the balance quality of G2.5.
Advantage of the present invention is:
1, the motor of this cooling system institute gas-distributing fan is equipped with special-purpose double-speed motor; Realize the switching of high and low rotating speed through the TEMP control system; So that be fit to the demand of different operating modes, reduce power consumption thereby when guaranteeing the traction convertor radiating effect, control power consumption.
2, its air intake flow-guiding mouth and shroud are the flared structure of arc combination, and are the assembly structure of running-on pattern, and this kind pattern is beneficial to the water conservancy diversion of gas and can reduces leakage loss.
3, the part of air intake flow-guiding mouth and the mutual running-on of shroud is an arc; And the part that the osculum end that makes the air intake flow-guiding mouth extend in this shroud is the arc extension mouth; Air-flow is played the effect of slick and sly guiding; More help the smooth and easy of fluid and flow, more meet near the flowing state of the air-flow of impeller suction port, avoid causing loss because of eddy current.The arc of air intake flow-guiding mouth makes gas can be full of the impeller inlet cross section uniformly, reduces flow losses.The arc of shroud can reduce the separation losses that impeller produces because of blade import turning back, thereby improves impeller adiabatic efficiency.
4, utilize the casing of existing cooling system,, saved the spiral case of common blower fan with impeller, air intake flow-guiding mouth, motor, motor mounting plate stack mounting; Spiral case can play the effect that is converted into the part dynamic pressure static pressure, but the amplitude of raising the efficiency thus is very little, only can improve former efficient 2%-3%; We reduce through the efficient that the adjustment on blade angle has remedied no spiral case; Be that Inlet cone angle b has reduced 5 degree than the original Inlet cone angle of prototype, changed the performance parameter of prototype, effectively acting is higher; Power loss reduces, so still reach 60% efficient.
Reach the balance quality of G2.5 when 5, preparation process has guaranteed the impeller balance; In conjunction with the cotton effect of the noise elimination of box inside; Make two typhoon machines all the vibration values when running up reach below the 4mm/s vibration that guarantees under the situation of cruising, not add up the speed of a motor vehicle car group runs at high speed and produced because of the vibration of blower fan.
6, two blower fans guarantee balanced weight, and special welding procedure of impeller and postwelding adopt timeliness vibration and the dual elimination welding residual stress of heat treatment, all want dynamic balancing before and after spraying paint, and guarantee balance quality G2.5.These are the main causes that reduce vibration.Two typhoon machine symmetries are located on the casing 5, and running counterclockwise in the same way, have offset most of separate unit blower fan (impeller) vibration that unidirectional running produced, and have obviously reduced vibration and noise that overall operation produces.The structural symmetry of two cover units is good more, and the effect that reduces vibration is just good more.
7, adopt the special welding of the alloy high strength structural steel of anti-low temperature, vibratory impulse, can satisfy the normal down operation of 3600r/m rotating speed under subzero 40 ℃ of environment.
Description of drawings
Fig. 1 is plan view of the present invention (the C-C sectional view of Fig. 3);
Fig. 2 is the left view of Fig. 1;
Fig. 3 is the A-A sectional view of Fig. 1;
Fig. 4 is a partial structurtes schematic representation of the present invention;
Fig. 5 is the structural representation (the B-B sectional view of Fig. 4) of impeller of the present invention;
Fig. 6 is the enlarged view at P place among Fig. 4.
Description of reference numerals: 1, noise elimination is cotton; 2, air intake flow-guiding mouth, 3, shroud, 4, impeller, 41, hub disk, 42, blade, 5, casing, 6, motor mounting plate, 7, motor, 8, exhaust outlet, 9, intake grill, 10, the flange plate of air intake flow-guiding mouth, 11, dividing plate, 12, the hub disk seat.
Embodiment
Referring to Fig. 1～Fig. 6, the cooling blower of a kind of electric express locomotive traction convertor of the present invention, on the rectangular box 5 of existing cooling system, with impeller 4, motor 7, motor mounting plate 6 combinations,
In the middle of this casing 5, be divided into two independently cavity A, a motor 7 respectively be housed, be respectively equipped with intake grill 9 and exhaust outlet 8 at front side and the downside of each this cavity A at the rear side of each this cavity A with dividing plate 11.Rear side at each this cavity A is connected with the front end of a motor 7 respectively; In each this cavity A, respectively be provided with on the output shaft that an impeller 4 and coaxial is installed in motor 7; Two impellers 4 all are rotated counterclockwise (supporting with whole cooling system), mutual noninterference when work.
Described impeller 4 is made up of shroud 3, hub disk 41 and a plurality of blade 42, and being uniformly distributed along the circumference in the front side of the hub disk 41 of circle is connected with to the crooked a plurality of blades 42 of equidirectional, and described intake grill 9 is corresponding with this blade 42; Be connected with shroud 3 in the front side of this impeller 4, be connected with the air intake flow-guiding mouth 2 corresponding in the inboard of this intake grill 9 with this shroud 3; This air intake flow-guiding mouth 2 and shroud 3 are tubaeform, and the osculum end of this air intake flow-guiding mouth 2 is corresponding with the osculum end of this shroud 3.Blade 42 is that strong back is to board-like blade.
Referring to Fig. 5, the exit angle of each blade 42 (angle of the tangent line of the tangent line of outer end and position circumference) a is 46 degree; The Inlet cone angle of each blade 42 (angle of the tangent line of interior edge end and the tangent line of position circumference) b is 23 degree.Angle b has reduced 5 degree than existing technology, and the performance curve that has changed the fan delivery-blast-power of impeller 4 changes, and the effective practical point of fan pressure and air quantity is increased, and total wasted work reduces 10% of former wasted work, and effectively acting is higher, and power loss reduces.Diameter B1 among Fig. 5 and the embodiment's of B2 parameter is 250mm and 400mm.
Referring to Fig. 4～Fig. 6, the inside diameter D 1 of the osculum end of this air intake flow-guiding mouth 2 is identical or close with the interior diameter of a circle B1 that each blade 42 of described impeller 4 centers on.The outer of the big opening end of this air intake flow-guiding mouth 2 is provided with flange plate 10 (being uniformly distributed with mounting hole 13 along the circumference, referring to Fig. 2), and this flange plate 10 fixedly mounts with the edges of the intake grill 9 of described casing 5 front sides.The corresponding connection of cylindrical (diameter B2) front end of the outer of the big opening end of this shroud 3 and each blade 42 of described impeller 4.
Be the assembly structure of running-on pattern between the osculum end of this air intake flow-guiding mouth 2 and this shroud 3; Promptly the osculum end of this air intake flow-guiding mouth 2 is inserted in the osculum end of this shroud 3; The radial clearance δ of the two cooperation is 1.8-2mm, and axially being inserted in size h is 10-11mm (referring to Fig. 6).
Referring to Fig. 6, described air intake flow-guiding mouth 2 axial cross sections are connected to form by osculum arcuate segment (2 sections of radius Rs) and big mouthful of arcuate segment (1 section of radius R) slyness, and the radius of curvature R 1 of this big mouthful of arcuate segment is 1.5～3 times of this osculum arcuate segment radius of curvature R 2.Described shroud 3 axial cross sections are connected to form by straightway L, big mouthful arcuate segment (4 sections of radius Rs) and osculum arcuate segment (3 sections of radius Rs) slyness successively, and the radius of curvature R 4 of this big mouthful of arcuate segment is 2～3 times of this osculum arcuate segment radius of curvature R 3.Satisfying under the prerequisite of above-mentioned requirements, each section axially with the size that makes progress of footpath as required (test) select.
The part that described air intake flow-guiding mouth 2 extend in this shroud 3 is the arc extension mouth; The minimum diameter of the osculum arcuate segment of described air intake flow-guiding mouth 2 (2 sections of radius Rs) (being described inside diameter D 1) locates to be positioned at the top of the osculum end of this shroud 3; Make that the curvature of osculum arcuate segment (3 sections of radius Rs) of this arc extension mouth and this shroud 3 is basic identical, the air-flow slyness that will flow through air intake flow-guiding mouth 2 imports in this shroud 3 swimmingly.The external diameter of arc extension mouth (the osculum end of air intake flow-guiding mouth 2) is slightly less than the internal diameter of the osculum end of shroud 3, makes that the two can suit.
The mounting flange 13 of described motor 7 front ends is installed in the rear side (adopting bolt to connect) of described casing 5 through motor mounting plate 6; Be equipped with the cotton layer 1 of eliminating the noise in the front side of described casing 5 and the inner face of the left and right sides.
Described motor 7 is a double-speed motor, realizes the switching of high and low rotating speed through the TEMP control system, so that be fit to the demand of different operating modes, reduces power consumption thereby when guaranteeing the traction convertor radiating effect, control power consumption.
Described impeller 4 adopts alloy high strength structural steel Q345E welding low temperature resistant, vibratory impulse to process with motor mounting plate 6; The JM-50 welding wire is adopted in welding; Gas is selected the mixed gas of argon gas and carbon dioxide for use, and the electric current during welding is 120A, and voltage is 20V; Sampler carried out defect detecting test after welding was accomplished, and this kind technology can satisfy 3600r/m rotating speed operation under subzero 40 ℃ of environment fully.
Described air intake flow-guiding mouth 2 adopts aluminium sheet to process.
Described blade 42 uses the blanking die blanking, and the weight difference of each blade uses the method for staggered symmetry welding less than 0.05kg, and welding speed is identical with electric current, makes welding deformation amount of vane control to minimum; In course of working, guarantee unifying datum, and it is unified to use moulds of industrial equipment control, (ISO was according to various commentaries on classics usage requirement, precision degree and working speed certainly in 1973 to make impeller reach G2.5; With being divided in the scope of dynamic balance accuracy from 0.16mm/s to 4000mm/s is 11 grades, and one-level is the highest, and ten one-levels are minimum; The balance accuracy grade of fan propeller is a level Four; Be G6.3, we accomplish three grades to this blower fan requirement, i.e. the balance quality of G2.5.
The present invention is connected the intake grill 9 of its front side in use with the interface of the traction convertor cooling system of motor-car; Under the driving of blower fan 7; Air is drawn from the intake grill 9 of casing 5 front sides under the action of centrifugal force of impeller 4; See the heat of the traction convertor of taking away motor-car off from exhaust outlet 8, reach radiating effect.Measure its temperature and transmit signal and carry out the switching of high and low rotating speed for motor 7 through the temperature transducer control system of whole cooling system, satisfy the heat radiation air quantity demand of different operating modes.Two typhoon machines are reverse running, and air quantity, blast under the same rotational speed are provided simultaneously.Vibration values was less than 4.0mm/s when production technology of the present invention and structure can guarantee that blower fan all reaches demand with fast running, air quantity and blast at the same time, the vibration that guarantees the speed of a motor vehicle under the situation of cruising, not add up because of the vibration of blower fan the car group runs at high speed and produced.
Claims (10)
1. the cooling blower of an electric express locomotive traction convertor; The casing (5) that comprises rectangle; In the middle of this casing (5), be divided into two independently cavitys, a motor (7) respectively be housed, be respectively equipped with intake grill (9) and exhaust outlet (8) at the front side and the downside of each this cavity at the rear side of each this cavity with dividing plate (11); It is characterized in that: the rear side at each this cavity is connected with the front end of a motor (7) respectively; In each this cavity, respectively be provided with on the output shaft that an impeller (4) and coaxial is installed in motor (7) the separate running of two impellers (4), mutual noninterference.
2. the cooling blower of electric express locomotive traction convertor according to claim 1; It is characterized in that: described impeller (4) is made up of shroud (3), hub disk (41) and a plurality of blade (42); Being uniformly distributed along the circumference in the front side of the hub disk (41) of circle connects to the crooked a plurality of blades (42) of equidirectional, and described intake grill (9) is corresponding with this blade (42); Be connected with shroud (3) in the front side of this impeller (4), be connected with the air intake flow-guiding mouth (2) corresponding in the inboard of this intake grill (9) with this shroud (3); This air intake flow-guiding mouth (2) and shroud (3) are tubaeform, and the osculum end of this air intake flow-guiding mouth (2) is corresponding with the osculum end of this shroud (3); Adopt welding manner to connect as one between this shroud (3), hub disk (41) and the blade (42).
3. the cooling blower of electric express locomotive traction convertor according to claim 2; It is characterized in that: the internal diameter of the osculum end of this air intake flow-guiding mouth (2) is identical or close with the interior diameter of a circle that each blade (42) of described impeller (4) centers on; The outer of the big opening end of this air intake flow-guiding mouth (2) is provided with flange plate (10), and this flange plate (10) fixedly mounts with the edge of the intake grill (9) of described casing (5) front side; The corresponding connection of cylindrical front end of the outer of the big opening end of this shroud (3) and each blade (42) of described impeller (4); The osculum end of this air intake flow-guiding mouth (2) is inserted in the osculum end of this shroud (3), and the radial clearance δ of the two cooperation is 1.8-2mm, and axially being inserted in size h is 10-11mm.
4. the cooling blower of electric express locomotive traction convertor according to claim 2; It is characterized in that: described air intake flow-guiding mouth (2) axial cross section is connected to form by osculum arcuate segment and big mouthful of arcuate segment slyness, and the radius of curvature of this big mouthful of arcuate segment is 2～3 times of this osculum arcuate segment radius of curvature; Described shroud (3) axial cross section is connected to form by straightway, big mouthful arcuate segment and osculum arcuate segment slyness successively, and the radius of curvature of this big mouthful of arcuate segment is 2～3 times of this osculum arcuate segment radius of curvature.
5. the cooling blower of electric express locomotive traction convertor according to claim 4; It is characterized in that: the part that described air intake flow-guiding mouth (2) extend in this shroud (3) is the arc extension mouth; The minimum diameter place of the osculum arcuate segment of described air intake flow-guiding mouth (2) is positioned at the top of the osculum end of this shroud (3); Make that the curvature of osculum arcuate segment of this arc extension mouth and this shroud (3) is basic identical, the air-flow slyness that will flow through air intake flow-guiding mouth (2) imports in this shroud (3) swimmingly.
6. the cooling blower of electric express locomotive traction convertor according to claim 2 is characterized in that: described blade (42) is for the back is to board-like blade by force, and the exit angle a of each blade (42) is 46 degree; The Inlet cone angle b of each blade (42) is 23 degree, and Inlet cone angle b reduces than existing technology, improves effectively acting, reduces power loss.
7. the cooling blower of electric express locomotive traction convertor according to claim 1 is characterized in that: the mounting flange (13) of its front end of described motor (7) is installed in the rear side of described casing (5) through motor mounting plate (6); At least be equipped with the cotton layer (1) of eliminating the noise in the front side of described casing (5) and the inner face of the left and right sides.
8. the cooling blower of electric express locomotive traction convertor according to claim 1; It is characterized in that: described motor (7) is a double-speed motor; Realize the switching of high and low rotating speed through the TEMP control system; So that be fit to the demand of different operating modes, reduce power consumption thereby when guaranteeing the traction convertor radiating effect, control power consumption.
9. the cooling blower of electric express locomotive traction convertor according to claim 1; It is characterized in that: described impeller (4) and motor mounting plate (6) adopt alloy high strength structural steel low temperature resistant, vibratory impulse to process, and described air intake flow-guiding mouth (2) adopts aluminium sheet to process; Two impellers (4) are when work and are rotated counterclockwise.
10. the cooling blower of electric express locomotive traction convertor according to claim 2; It is characterized in that: described blade (42) uses the blanking die blanking; The weight difference of each blade is less than 0.05kg; Use the method for staggered symmetry welding, welding speed is identical with electric current, makes welding deformation amount of vane control to minimum; In course of working, guarantee unifying datum, and it is unified to use moulds of industrial equipment control, makes impeller reach the balance quality of G2.5.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201010584398XA CN102536857A (en) | 2010-12-13 | 2010-12-13 | Cooling fan for traction converter of high-speed electric locomotive |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201010584398XA CN102536857A (en) | 2010-12-13 | 2010-12-13 | Cooling fan for traction converter of high-speed electric locomotive |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107642491A (en) * | 2017-11-02 | 2018-01-30 | 洛阳北玻台信风机技术有限责任公司 | Motor-car, the cooling of high ferro tractive transformer fluidize centrifugal blower with ternary |
| CN108897069A (en) * | 2018-05-03 | 2018-11-27 | 合肥光博量子科技有限公司 | A kind of INTEGRATED SIGHT vehicle of traveling observation |
| CN109973410A (en) * | 2019-04-11 | 2019-07-05 | 浙江科贸智能机电股份有限公司 | A kind of no spiral case centrifugal fan |
| CN110439834A (en) * | 2019-08-23 | 2019-11-12 | 洛阳北玻台信风机技术有限责任公司 | A kind of ternary fluidisation centrifugal blower for annealing furnace |
| CN110926092A (en) * | 2019-12-07 | 2020-03-27 | 佛山宇仁智能科技有限公司 | Flexible circulating cooling mechanism |
| CN117167295A (en) * | 2023-11-03 | 2023-12-05 | 佛山市南海九洲普惠风机有限公司 | High static pressure backward multi-wing centrifugal fan |
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| CN107642491A (en) * | 2017-11-02 | 2018-01-30 | 洛阳北玻台信风机技术有限责任公司 | Motor-car, the cooling of high ferro tractive transformer fluidize centrifugal blower with ternary |
| CN107642491B (en) * | 2017-11-02 | 2024-03-12 | 洛阳北玻三元流风机技术有限公司 | Ternary fluidization centrifugal fan for cooling motor car and high-speed rail traction transformer |
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| CN110439834A (en) * | 2019-08-23 | 2019-11-12 | 洛阳北玻台信风机技术有限责任公司 | A kind of ternary fluidisation centrifugal blower for annealing furnace |
| CN110439834B (en) * | 2019-08-23 | 2024-02-02 | 洛阳北玻三元流风机技术有限公司 | Ternary fluidization centrifugal fan for toughening furnace |
| CN110926092A (en) * | 2019-12-07 | 2020-03-27 | 佛山宇仁智能科技有限公司 | Flexible circulating cooling mechanism |
| CN117167295A (en) * | 2023-11-03 | 2023-12-05 | 佛山市南海九洲普惠风机有限公司 | High static pressure backward multi-wing centrifugal fan |
| CN117167295B (en) * | 2023-11-03 | 2024-01-02 | 佛山市南海九洲普惠风机有限公司 | High static pressure backward multi-wing centrifugal fan |
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Application publication date: 20120704 |