CN113623248A - Centrifugal blower capable of preventing blade top leakage - Google Patents
Centrifugal blower capable of preventing blade top leakage Download PDFInfo
- Publication number
- CN113623248A CN113623248A CN202110974185.6A CN202110974185A CN113623248A CN 113623248 A CN113623248 A CN 113623248A CN 202110974185 A CN202110974185 A CN 202110974185A CN 113623248 A CN113623248 A CN 113623248A
- Authority
- CN
- China
- Prior art keywords
- air
- blower
- guide vane
- impeller
- gap
- 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
Links
- 238000007664 blowing Methods 0.000 claims abstract description 57
- 230000017525 heat dissipation Effects 0.000 claims description 10
- 238000009413 insulation Methods 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 6
- 230000005855 radiation Effects 0.000 claims description 4
- 239000002131 composite material Substances 0.000 claims description 3
- 238000001816 cooling Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000009423 ventilation Methods 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Images
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
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
- F04D25/0606—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
- F04D25/082—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation the unit having provision for cooling the motor
-
- 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
- F04D29/05—Shafts or bearings, or assemblies thereof, specially adapted for elastic fluid pumps
- F04D29/056—Bearings
-
- 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
- F04D29/083—Sealings 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
- F04D29/26—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
-
- 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
- F04D29/444—Bladed diffusers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/58—Cooling; Heating; Diminishing heat transfer
- F04D29/5806—Cooling the drive system
-
- 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
- F04D29/58—Cooling; Heating; Diminishing heat transfer
- F04D29/582—Cooling; Heating; Diminishing heat transfer specially adapted for elastic fluid pumps
- F04D29/584—Cooling; Heating; Diminishing heat transfer specially adapted for elastic fluid pumps cooling or heating the machine
Abstract
The invention relates to the field of blowers, in particular to a centrifugal blower capable of preventing blade top leakage. The blower comprises a motor shell, a motor shaft, a bearing device, a blower impeller and a volute; the volute is provided with a blowing channel, and the blowing impeller is positioned in the blowing channel; the air blast impeller is provided with an impeller body, air blast blades and guide vanes; a blade top gap is arranged between the blast blade and the inner wall of the blast channel, and one end of the blade top gap is communicated with the air outlet end of the blast channel; the guide vane is arranged at the air inlet end of the impeller body and used for pressurizing air flowing through, and the air pressure after pressurization of the guide vane is greater than or equal to the air pressure at the air outlet end of the air blowing channel; guide vane gaps are arranged between the guide vanes and the inner wall of the air blowing channel, and two ends of each guide vane gap are respectively communicated with the air inlet end of the air blowing channel and the other end of the blade top gap. The air blower ensures the air blowing flow of the air blower, and improves the stability and the service life of the whole equipment.
Description
Technical Field
The invention relates to the field of blowers, in particular to a centrifugal blower capable of preventing blade top leakage.
Background
The centrifugal fan is a driven fluid machine which increases the pressure of gas and discharges the gas by means of input mechanical energy. Centrifugal fans are widely used in ventilation, dust removal and cooling of factories, mines, tunnels, cooling towers, vehicles, ships and buildings; ventilation and draught of boilers and industrial furnaces; cooling and ventilation in air conditioning equipment and household appliances; drying and selecting grains; wind tunnel wind source and air cushion boat inflation and propulsion.
As shown in fig. 1 and 2, after working by the blower impeller, the gas enters the gas outlet end of the volute blower channel, and a part of the gas leaks to the gas inlet end of the volute blower channel along the blade tips of the blower blades; in the prior art, an axial seal c is arranged between the inner wall of the air blowing channel at the air inlet end of the volute (a) and the air inlet end of the air blowing impeller (b) to throttle and seal gas leaking to the blade tops of the air blowing blades (b) so as to reduce the influence of axial force.
The prior art has the following defects: the axial seal cannot completely throttle the gas, and part of high-pressure gas still leaks to the air inlet end of the air blowing channel, so that the air blowing flow of the air blower is reduced; meanwhile, the high-pressure gas of the part can generate larger axial force on the volute, so that the stress of the whole machine in the axial direction is unstable, and the stability and the service life of the whole equipment are reduced.
Disclosure of Invention
The purpose of the invention is: aiming at the problems, the method is provided with guide vanes for pressurizing gas at the air inlet end of the air blowing impeller, and guide vane gaps which are respectively communicated with the vane top gap and the air inlet end of the air blowing channel are arranged between the guide vanes and the inner wall of the air blowing channel; the air at the air inlet end of the air blowing channel is pressurized and guided to the blade top gap, and the air at the air outlet end of the air blowing channel is prevented from leaking to the air inlet end of the air blowing channel, so that the air blowing flow of the air blower is ensured; meanwhile, the two gas flows along the opposite direction to offset a part of axial force, so that the instability of the whole machine in axial stress is avoided, the stability of the whole equipment is improved, and the service life of the centrifugal blower capable of preventing the leakage of the blade top is prolonged.
In order to achieve the purpose, the invention adopts the following technical scheme:
a centrifugal blower capable of preventing blade tip leakage comprises a motor housing, a motor shaft, a bearing device, a blower impeller and a volute; the bearing device is sleeved on the outer wall of the motor shaft, and the blast impeller is fixed at one end of the motor shaft; the volute is provided with a blowing channel, and the blowing impeller is positioned in the blowing channel; the air blast impeller is provided with an impeller body, air blast blades and guide vanes; a blade top gap is arranged between the blast blade and the inner wall of the blast channel, and one end of the blade top gap is communicated with the air outlet end of the blast channel; the guide vane is arranged at the air inlet end of the impeller body and used for pressurizing air flowing through, and the air pressure after pressurization of the guide vane is greater than or equal to the air pressure at the air outlet end of the air blowing channel; guide vane gaps are arranged between the guide vanes and the inner wall of the blast passage and comprise radial guide vane gaps and axial guide vane gaps; the lower end of the radial guide vane gap is communicated with the air inlet end of the blast channel, and the upper end of the radial guide vane gap is communicated with the other end of the blade top gap through the axial guide vane gap.
Preferably, the guide vane has an inclined shape in which the distance from the air inlet end to the center of the blower impeller is short and the distance from the air outlet end to the center of the blower impeller is long.
Preferably, the bearing device comprises a front bearing and a rear bearing, the front bearing and the rear bearing are both fixed on the motor shell, and the front bearing and the rear bearing are respectively sleeved at two ends of the motor shaft.
Preferably, a sealing block is arranged between the back of the blower impeller and the motor casing, and the sealing block is used for preventing high-pressure gas in the volute from entering the interior of the blower along the back of the blower impeller.
Preferably, a cowling is fixedly arranged at an air inlet end of the air blowing impeller, and the cowling is used for guiding sucked air, so that the air blowing efficiency of the air blower is improved.
Preferably, the motor cylinder is externally provided with a frequency converter, the frequency converter is provided with a frequency converter shell, and the frequency converter shell is provided with a heat dissipation rib.
Preferably, a heat insulation plate made of composite materials is arranged between the frequency converter and the motor cylinder, and the heat insulation plate is used for reducing heat transfer between the blower and the frequency converter.
Preferably, the air blower is further provided with a fan fixing seat, a heat dissipation fan is arranged on the fan fixing seat, and the heat dissipation fan is used for dissipating heat inside the air blower and the frequency converter.
Preferably, the heat dissipation fan comprises a fan motor and axial flow blades, and the output end of the fan motor is connected with the axial flow blades.
The centrifugal blower capable of preventing the leakage of the blade top adopting the technical scheme has the advantages that:
the motor shaft rotates to drive the blast impeller to rotate, and then the guide vanes are driven to rotate to pressurize the gas at the air inlet end of the blast channel; then the pressurized gas flows to the blade top gap along the guide blade gap; because the air pressure of the guide vanes after pressurization is greater than or equal to the air pressure of the air outlet end of the air blowing channel, the pressurized air can prevent the air at the air outlet end of the air blowing channel from leaking to the air inlet end of the air blowing channel, and therefore the air blowing flow of the air blower is ensured; meanwhile, the pressurized gas and the leakage gas at the air outlet end of the blast channel flow along opposite directions to offset a part of axial force, so that the instability of the whole machine in axial stress is avoided, and the stability and the service life of the whole equipment are improved.
Drawings
Fig. 1 is a schematic structural diagram of a prior art blower impeller.
Fig. 2 is a partially enlarged structural schematic diagram of a prior art blower impeller.
Fig. 3 is a schematic structural diagram of the present invention.
Fig. 4-6 are schematic views of the blower wheel structures.
Detailed Description
The following describes in detail embodiments of the present invention with reference to the drawings.
Example 1
A centrifugal blower capable of preventing tip leakage, as shown in fig. 3-6, includes a motor housing 1, a motor shaft 2, a bearing device 3, a blower impeller 4 and a volute 5; the bearing device 3 is sleeved on the outer wall of the motor shaft 2, and the blast impeller 4 is fixed at one end of the motor shaft 2; the volute 5 is provided with an air blowing channel 51, and the air blowing impeller 4 is positioned in the air blowing channel 51; the blower impeller 4 is provided with an impeller body 41, blower blades 42, and guide vanes 43; a blade top gap 44 is arranged between the blowing blade 42 and the inner wall of the blowing channel 51, and one end of the blade top gap 44 is communicated with the air outlet end of the blowing channel 51; the guide vane 43 is arranged at the air inlet end of the impeller body 41, the guide vane 43 is used for pressurizing air flowing through, and the air pressure after pressurization of the guide vane 43 is greater than or equal to the air pressure at the air outlet end of the air blowing channel 51; guide vane gaps 45 are arranged between the guide vanes 43 and the inner wall of the air blowing channel 51, and the guide vane gaps 45 comprise radial guide vane gaps 451 and axial guide vane gaps 452; the lower end of the radial guide vane gap 451 is communicated with the air inlet end of the air blowing channel 51, and the upper end of the radial guide vane gap 451 is communicated with the other end of the vane top gap 44 through the axial guide vane gap 452. In this way, the motor shaft 2 rotates to drive the blower impeller 4 to rotate, and further drive the guide vanes 43 to rotate to pressurize the air at the air inlet end of the blower passage 51; then the pressurized gas flows to the blade top gap along the guide blade gap; because the air pressure of the guide vane 43 after pressurization is greater than or equal to the air pressure of the air outlet end of the air blowing channel 51, the pressurized air can prevent the air at the air outlet end of the air blowing channel 51 from leaking to the air inlet end of the air blowing channel 51, so that the air blowing flow of the air blower is ensured; meanwhile, the pressurized gas and the leakage gas at the air outlet end of the air blowing channel 51 flow along opposite directions to offset a part of axial force, so that the instability of the whole machine in axial stress is avoided, and the stability and the service life of the whole equipment are improved.
The guide vane 43 is formed in an inclined shape in which the distance from the air inlet end to the center of the blower impeller 4 is short and the distance from the air outlet end to the center of the blower impeller 4 is long, so as to pressurize the passing air.
As shown in fig. 3, the bearing device 3 includes a front bearing 31 and a rear bearing 32, the front bearing 31 and the rear bearing 32 are both fixed on the motor housing 1, and the front bearing 31 and the rear bearing 32 are respectively sleeved on two ends of the motor shaft 2 to support the motor shaft 2.
A sealing block 52 is arranged between the back of the blower wheel 4 and the motor casing 1, and the sealing block 52 is used for preventing high-pressure gas in the volute 5 from entering the interior of the blower along the back of the blower wheel 4.
The air inlet end of the air blowing impeller 4 is fixedly provided with a fairing 46, and the fairing 46 is used for guiding sucked air, so that the air blowing efficiency of the air blower is improved.
The outside of the motor barrel 1 is provided with a frequency converter 11, the frequency converter 11 is provided with a frequency converter shell 12, and the frequency converter shell 12 is provided with a heat dissipation rib 13.
A heat insulation board 14 made of composite materials is arranged between the frequency converter 11 and the motor barrel 1, and the heat insulation board 14 is used for reducing heat transfer between the blower and the frequency converter 11. The frequency converter shell 12 is provided with the heat dissipation ribs 13, so that the temperature of the frequency converter 11 can be effectively reduced, and the service life of the frequency converter 11 is prolonged.
The blower is further provided with a fan fixing seat 15, a heat dissipation fan 16 is arranged on the fan fixing seat 15, and the heat dissipation fan 16 is used for dissipating heat inside the blower and the frequency converter 11. The heat radiation fan 16 includes a fan motor and axial flow blades, and an output end of the fan motor is connected to the axial flow blades to effectively increase a heat radiation air volume.
Claims (9)
1. A centrifugal blower capable of preventing blade tip leakage is characterized by comprising a motor shell (1), a motor shaft (2), a bearing device (3), a blower impeller (4) and a volute (5); the bearing device (3) is sleeved on the outer wall of the motor shaft (2), and the blast impeller (4) is fixed at one end of the motor shaft (2); the volute (5) is provided with a blowing channel (51), and the blowing impeller (4) is positioned in the blowing channel (51); the air blowing impeller (4) is provided with an impeller body (41), air blowing blades (42) and guide blades (43); a blade top gap (44) is arranged between the blowing blade (42) and the inner wall of the blowing channel (51), and one end of the blade top gap (44) is communicated with the air outlet end of the blowing channel (51); the guide vane (43) is arranged at the air inlet end of the impeller body (41), the guide vane (43) is used for pressurizing air flowing through, and the air pressure after pressurization of the guide vane (43) is greater than or equal to the air pressure at the air outlet end of the air blowing channel (51); a guide vane gap (45) is arranged between the guide vane (43) and the inner wall of the air blowing channel (51), and the guide vane gap (45) comprises a radial guide vane gap (451) and an axial guide vane gap (452); the lower end of the radial guide vane gap (451) is communicated with the air inlet end of the air blowing channel (51), and the upper end of the radial guide vane gap (451) is communicated with the other end of the blade top gap (44) through the axial guide vane gap (452).
2. The centrifugal blower capable of preventing leakage from the tip of the blade as set forth in claim 1, wherein the guide vane (43) has an inclined shape in which the distance from the inlet end to the center of the blower wheel (4) is short and the distance from the outlet end to the center of the blower wheel (4) is long.
3. The centrifugal blower capable of preventing blade tip leakage according to claim 1, wherein the bearing device (3) comprises a front bearing (31) and a rear bearing (32), the front bearing (31) and the rear bearing (32) are both fixed on the motor housing (1), and the front bearing (31) and the rear bearing (32) are respectively sleeved on two ends of the motor shaft (2).
4. The centrifugal blower capable of preventing blade tip leakage according to claim 1, wherein a sealing block (52) is provided between the back of the blower wheel (4) and the motor casing (1), and the sealing block (52) is used for preventing high-pressure gas in the volute (5) from entering the interior of the blower along the back of the blower wheel (4).
5. The centrifugal blower capable of preventing blade tip leakage according to claim 1, wherein a cowling (46) is fixedly arranged at an air inlet end of the blower wheel (4), and the cowling (46) is used for guiding sucked air to improve the blowing efficiency of the blower.
6. The centrifugal blower capable of preventing blade tip leakage according to claim 1, wherein a frequency converter (11) is arranged outside the motor cylinder (1), the frequency converter (11) is provided with a frequency converter housing (12), and the frequency converter housing (12) is provided with heat dissipation ribs (13).
7. A centrifugal blower capable of preventing blade tip leakage according to claim 6, characterized in that a heat insulation board (14) made of composite material is arranged between the frequency converter (11) and the motor barrel (1), and the heat insulation board (14) is used for reducing heat transfer between the blower and the frequency converter (11).
8. The centrifugal blower capable of preventing blade tip leakage according to claim 6, wherein the blower is further provided with a fan fixing seat (15), the fan fixing seat (15) is provided with a heat radiation fan (16), and the heat radiation fan (16) is used for radiating heat inside the blower and the frequency converter (11).
9. The centrifugal blower capable of preventing blade tip leakage according to claim 8, wherein the heat dissipation fan (16) includes a fan motor and axial flow blades, and an output end of the fan motor is connected with the axial flow blades.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110974185.6A CN113623248A (en) | 2021-08-24 | 2021-08-24 | Centrifugal blower capable of preventing blade top leakage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110974185.6A CN113623248A (en) | 2021-08-24 | 2021-08-24 | Centrifugal blower capable of preventing blade top leakage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113623248A true CN113623248A (en) | 2021-11-09 |
Family
ID=78387415
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110974185.6A Pending CN113623248A (en) | 2021-08-24 | 2021-08-24 | Centrifugal blower capable of preventing blade top leakage |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113623248A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114962302A (en) * | 2022-06-17 | 2022-08-30 | 浙江科力风机有限公司 | Energy-saving environment-friendly centrifugal fan |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101382077A (en) * | 2007-09-04 | 2009-03-11 | 通用电气公司 | Labyrinth compression seal and turbine incorporating the same |
| CN202665445U (en) * | 2012-07-06 | 2013-01-16 | 湖州巨宏电机有限公司 | Anti-backflow impeller for dust collector |
| CA2956900A1 (en) * | 2016-02-11 | 2017-08-11 | General Electric Company | Centrifugal compressor assembly for use in a turbine engine and method of assembly |
| CN108869379A (en) * | 2018-05-02 | 2018-11-23 | 江苏大学 | A kind of centrifugal pump seal ring with axial diversion blade |
| CN218439895U (en) * | 2021-08-24 | 2023-02-03 | 鑫磊压缩机股份有限公司 | Volute and impeller device capable of preventing blade tip leakage and centrifugal blower |
-
2021
- 2021-08-24 CN CN202110974185.6A patent/CN113623248A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101382077A (en) * | 2007-09-04 | 2009-03-11 | 通用电气公司 | Labyrinth compression seal and turbine incorporating the same |
| CN202665445U (en) * | 2012-07-06 | 2013-01-16 | 湖州巨宏电机有限公司 | Anti-backflow impeller for dust collector |
| CA2956900A1 (en) * | 2016-02-11 | 2017-08-11 | General Electric Company | Centrifugal compressor assembly for use in a turbine engine and method of assembly |
| CN108869379A (en) * | 2018-05-02 | 2018-11-23 | 江苏大学 | A kind of centrifugal pump seal ring with axial diversion blade |
| CN218439895U (en) * | 2021-08-24 | 2023-02-03 | 鑫磊压缩机股份有限公司 | Volute and impeller device capable of preventing blade tip leakage and centrifugal blower |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114962302A (en) * | 2022-06-17 | 2022-08-30 | 浙江科力风机有限公司 | Energy-saving environment-friendly centrifugal fan |
| CN114962302B (en) * | 2022-06-17 | 2023-09-26 | 浙江科力风机有限公司 | Energy-saving environment-friendly centrifugal fan |
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