CN110594192A - Rotor structure of centrifugal fan - Google Patents
Rotor structure of centrifugal fan Download PDFInfo
- Publication number
- CN110594192A CN110594192A CN201910995698.8A CN201910995698A CN110594192A CN 110594192 A CN110594192 A CN 110594192A CN 201910995698 A CN201910995698 A CN 201910995698A CN 110594192 A CN110594192 A CN 110594192A
- Authority
- CN
- China
- Prior art keywords
- blades
- impeller
- blade
- centrifugal fan
- rotating shaft
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000005452 bending Methods 0.000 claims description 4
- 229920006351 engineering plastic Polymers 0.000 claims description 3
- 229920005989 resin Polymers 0.000 claims description 3
- 239000011347 resin Substances 0.000 claims description 3
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 description 2
- 230000008676 import Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910001092 metal group alloy Inorganic materials 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- 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
- 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
- F04D29/26—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
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
- F04D29/663—Sound attenuation
-
- 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
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
- F04D29/666—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by means of rotor construction or layout, e.g. unequal distribution of blades or 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
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
- F04D29/667—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by influencing the flow pattern, e.g. suppression of turbulence
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention relates to a rotor structure of a centrifugal fan, which comprises a first impeller (1), a second impeller (2) and a rotating shaft (3), and is characterized in that: the blades of the first impeller comprise a plurality of first blades (16), a plurality of second blades (17) and a plurality of third blades (18), the first blades, the second blades and the third blades are arranged in a staggered mode along the circumference, the second blades are located between the first blades and the third blades, and the front edges of the first blades, the second blades and the third blades are different in radius and are sequentially increased. The method can reduce the possibility of space pressure fluctuation and pressure impact at different intervals, reduce the noise at the outlet of the impeller, reduce the turbulent flow at the inlet of the impeller and reduce the noise at the inlet of the impeller.
Description
Technical Field
The invention relates to the technical field of centrifugal fans, in particular to a rotor structure of a centrifugal fan.
Background
The centrifugal fan is widely applied to various industrial, production and living environments, and the structure of the impeller has great influence on the pressure and noise control of the centrifugal fan. The existing impeller comprises a plurality of first blades, a plurality of second blades and a plurality of third blades, but the different space spaces among the blades have the problems of pressure fluctuation and large noise at an inlet and an outlet.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a rotor structure of a centrifugal fan, which can reduce the possibility of space pressure fluctuation and pressure impact at different intervals, reduce the noise of an impeller outlet, reduce the turbulence at the impeller inlet and reduce the noise of the impeller inlet.
In order to achieve the purpose, the invention adopts the technical scheme that:
a rotor structure of a centrifugal fan comprises a first impeller (1), a second impeller (2) and a rotating shaft (3), wherein the first impeller and the second impeller rotate along with the rotating shaft, the rotating shaft is driven by a motor to rotate, the second impeller is arranged at an inlet hole of the first impeller, the first impeller comprises a plurality of blades, a rear disc, a front disc, a hub and a cylindrical section, the rotating shaft comprises a threaded section and a step section, the hub is provided with a threaded hole and a step hole, and the threaded hole and the step hole are respectively matched with the threaded section and the step section of the rotating shaft; wheel hub is connected with the cylinder section, and the periphery of cylinder section is equipped with second impeller, its characterized in that: the blades of the first impeller comprise a plurality of first blades (16), a plurality of second blades (17) and a plurality of third blades (18), the first blades, the second blades and the third blades are arranged in a staggered mode along the circumference, the second blades are located between the first blades and the third blades, and the front edges of the first blades, the second blades and the third blades are different in radius and are sequentially increased.
The front edge of the third blade is connected to the concave side of the second blade, and an angular space is formed between the third blade and the second blade.
The second impeller comprises a plurality of blades, saw teeth (22) and an inclined part (23), the front edges of the blades are arranged to be the saw teeth, the inclined part is arranged on the side, opposite to the saw teeth, of the blades, and a radial gap is formed between the blades and the front disc.
The second blade and two adjacent first blades respectively have spacing spaces S1 and S2 therebetween, and the spacing space S1 is less than the spacing space S2, namely, the second blade is more biased toward the first blade on the upstream side.
Wherein, a plurality of circulation holes (19) are arranged on the second blade and communicated with the angular space.
The sawtooth part comprises a row of triangular sawteeth, the sawtooth part is horizontally arranged, and the sawtooth part is almost flush with the end face of the cylindrical section.
The bending direction of the blades of the second impeller is opposite to the bending direction of the first blades, the second blades and the third blades; the outer diameters of the rear edges of the first blade, the second blade and the third blade are the same as the outer diameter of the rear disc.
The blades of the second impeller, the first blades, the second blades and the third blades are two-dimensional blades; the first impeller and the second impeller are made of engineering plastics or resin.
The rotor structure of the centrifugal fan can reduce the possibility of space pressure fluctuation and pressure impact at different intervals, reduce the noise of the outlet of the impeller, reduce the turbulent flow at the inlet of the impeller and reduce the noise of the inlet of the impeller.
Drawings
FIG. 1 is a front view of a rotor structure of a centrifugal fan according to the present invention;
FIG. 2 is a bottom view of the rotor structure of the present invention (with the front disk removed);
FIG. 3 is a view showing the construction of a second impeller according to the present invention;
figure 4 is a view of the flow hole of the present invention.
In the figure: the impeller comprises a first impeller 1, a second impeller 2, a rotating shaft 3, blades 11, a rear disk 12, a front disk 13, a hub 14, a cylindrical section 15, a first blade 16, a second blade 17, a third blade 18, a flow hole 19, blades 21, a sawtooth part 22, an inclined part 23, a threaded section 31, a step section 32 and a rotating direction R/anticlockwise.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
See figures 1-4: this centrifugal fan's rotor structure includes first impeller 1, second impeller 2, pivot 3, and first impeller 1, second impeller 2 rotate along with pivot 3 together, and pivot 3 rotates under the drive of motor, and second impeller 2 sets up in the inlet opening department (13 internal diameters departments of front disc) of first impeller 1.
The first impeller 1 comprises a plurality of blades 11, a rear disc 12, a front disc 13, a hub 14 and a cylindrical section 15, the rotating shaft 3 comprises a threaded section 31 and a step section 32, and the hub 14 is provided with a threaded hole and a step hole which are respectively matched with the threaded section 31 and the step section 32 of the rotating shaft 3; wheel hub 14 and cylinder section 15 integrated into one piece, the periphery of cylinder section 15 is equipped with second impeller 2, cylinder section 15 exceeds the plane at first impeller 1's front disc 13 place in the axial, second impeller 2 includes a plurality of blades 21, sawtooth portion 22, rake 23, a plurality of blades 21 are along circumference evenly distributed, the leading edge/import limit of blade 21 sets up to sawtooth portion 22, sawtooth portion 22 includes one row of triangle-shaped sawtooth, sawtooth portion 22 level sets up, sawtooth portion 22 is about flush with the terminal surface of cylinder section 15, sawtooth portion 22 can play the effect that reduces certain noise, second impeller 2 plays guide vane's effect, can reduce the turbulent flow of first impeller import department. The inclined portion 23 is provided on the opposite side/trailing edge of the blade 21 from the serration portion 22 with a radial gap between the blade 21 and the front disk 13.
The blades 11 of the first impeller 1 comprise a plurality of first blades 16, a plurality of second blades 17 and a plurality of third blades 18, the plurality of first blades 16, the plurality of second blades 17 and the plurality of third blades 18 are respectively and uniformly distributed along the circumference, the first blades 16, the second blades 17 and the third blades 18 are arranged in a staggered manner along the circumference, the second blades 17 are positioned between the first blades 16 and the third blades 18, the front edge/radial inner edge of the third blades 18 is connected with the concave side of the second blades 17, an angular space is formed between the third blades 18 and the second blades 17, and the front edge/radial inner edge radiuses of the first blades 16, the second blades 17 and the third blades 18 are different and are sequentially increased; the vane 21 is curved in the opposite direction to the first, second, and third vanes 16, 17, 18. The outer diameters of the outer edges/outlets of the first blades 16, the second blades 17 and the third blades 18 are the same as the outer diameter of the rear disc 12; the trailing edge of the blade 21 is adjacent to or aligned with the leading edge of the first blade 16.
The second vane 17 and two adjacent first vanes 16 have spacing spaces S1 and S2 therebetween, respectively, and on a pitch circle of any radius, the spacing space S1 is less than the spacing space S2, that is, the second vane 17 is more biased toward the first vane 16 on the upstream side.
The second vane 17 is provided with a plurality of circulation holes 19, the plurality of circulation holes 19 are communicated with the angular space, the plurality of circulation holes 19 are arranged in an array form, for example, 5x4 is arranged, the circulation holes 19 are round holes or tapered holes, pressure may be unevenly distributed between the space S1 and the space S2, so that the pressure fluctuation and the pressure impact are possible, the circulation holes 19 are communicated with the angular space and the space S1, the pressure fluctuation and the pressure impact are reduced, and the noise is reduced.
The blade 21, the first blade 16, the second blade 17 and the third blade 18 are two-dimensional blades; the first impeller 1 and the second impeller 2 may be made of high-strength engineering plastics or resin, or may be made of metal alloy, and the materials may be selected according to the use conditions.
The rotor structure of the centrifugal fan can reduce the possibility of space pressure fluctuation and pressure impact at different intervals, reduce the noise of an impeller outlet, reduce the turbulent flow at an impeller inlet and reduce the noise of the impeller inlet.
The above-described embodiments are illustrative of the present invention and not restrictive, it being understood that various changes, modifications, substitutions and alterations can be made herein without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.
Claims (4)
1. A rotor structure of a centrifugal fan comprises a first impeller (1), a second impeller (2) and a rotating shaft (3), wherein the first impeller and the second impeller rotate along with the rotating shaft, the rotating shaft is driven by a motor to rotate, the second impeller is arranged at an inlet hole of the first impeller, the first impeller comprises a plurality of blades, a rear disc, a front disc, a hub and a cylindrical section, the rotating shaft comprises a threaded section and a step section, the hub is provided with a threaded hole and a step hole, and the threaded hole and the step hole are respectively matched with the threaded section and the step section of the rotating shaft; wheel hub is connected with the cylinder section, and the periphery of cylinder section is equipped with second impeller, its characterized in that: the blade of the first impeller comprises a plurality of first blades (16), a plurality of second blades (17) and a plurality of third blades (18), the first blades, the second blades and the third blades are arranged in a staggered mode along the circumference, the second blades are located between the first blades and the third blades, the front edges of the first blades, the second blades and the third blades are different in radius and sequentially increased, the front edge of the third blade is connected to the concave side of the second blade, an angular space is formed between the third blades and the second blades, a plurality of circulation holes (19) are formed in the second blades and communicated with the angular space, each second impeller comprises a plurality of blades, saw teeth (22) and inclined parts (23), the front edge of each blade is provided with the saw teeth and arranged on the side, opposite to the saw teeth, of the blade, a radial gap is formed between the blade and a front disc, and the blade of the second impeller, The first blade, the second blade and the third blade are two-dimensional blades; the first impeller and the second impeller are made of engineering plastics or resin.
2. The rotor structure of a centrifugal fan according to claim 1, wherein: the second blade and two adjacent first blades respectively have spacing spaces S1, S2 therebetween, wherein the spacing space S1 is less than the spacing space S2, that is, the second blade is more biased toward the first blade on the upstream side.
3. The rotor structure of a centrifugal fan according to claim 1, wherein: the sawtooth part comprises a row of triangular sawteeth, the sawtooth part is horizontally arranged, and the sawtooth part is almost flush with the end face of the cylindrical section.
4. The rotor structure of a centrifugal fan according to claim 1, wherein: the bending direction of the blades of the second impeller is opposite to the bending direction of the first blades, the second blades and the third blades; the outer diameters of the rear edges of the first blade, the second blade and the third blade are the same as the outer diameter of the rear disc.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910995698.8A CN110594192B (en) | 2018-07-17 | 2018-07-17 | Rotor structure of centrifugal fan |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810783627.7A CN108953236B (en) | 2018-07-17 | 2018-07-17 | A kind of rotor structure of centrifugal blower |
| CN201910995698.8A CN110594192B (en) | 2018-07-17 | 2018-07-17 | Rotor structure of centrifugal fan |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810783627.7A Division CN108953236B (en) | 2018-07-17 | 2018-07-17 | A kind of rotor structure of centrifugal blower |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110594192A true CN110594192A (en) | 2019-12-20 |
| CN110594192B CN110594192B (en) | 2020-11-17 |
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Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910995698.8A Active CN110594192B (en) | 2018-07-17 | 2018-07-17 | Rotor structure of centrifugal fan |
| CN201810783627.7A Active CN108953236B (en) | 2018-07-17 | 2018-07-17 | A kind of rotor structure of centrifugal blower |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810783627.7A Active CN108953236B (en) | 2018-07-17 | 2018-07-17 | A kind of rotor structure of centrifugal blower |
Country Status (1)
| Country | Link |
|---|---|
| CN (2) | CN110594192B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114962346A (en) * | 2022-06-29 | 2022-08-30 | 江西镁淇实业有限公司 | Efficient treatment chamber for textile manufacturing process |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111677511A (en) * | 2020-05-08 | 2020-09-18 | 梅木精密工业(珠海)有限公司 | Submarine mineral sediment collecting and lifting method and mining system |
| CN112177977B (en) * | 2020-11-12 | 2021-12-28 | 江苏优格曼航空科技有限公司 | Low-wind-resistance impeller for magnetic suspension fan and preparation method thereof |
| CN114607639B (en) * | 2022-02-28 | 2024-02-20 | 江西南方锅炉股份有限公司 | Conveying device for steam boiler equipment |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20010065947A (en) * | 1999-12-30 | 2001-07-11 | 전완호 | A centrifugal impeller with flow guide blade for high performance, low noise |
| JP2005113770A (en) * | 2003-10-07 | 2005-04-28 | Daikin Ind Ltd | Centrifugal blower and air conditioner using it |
| CN1757932A (en) * | 2005-10-27 | 2006-04-12 | 陈瑜 | Impellor used for centrifugal pump and centrifugal type fan |
| DE102010002673A1 (en) * | 2010-03-09 | 2011-09-15 | Robert Bosch Gmbh | Hand tools fan |
| CN103835995A (en) * | 2012-11-22 | 2014-06-04 | 威海克莱特菲尔风机股份有限公司 | Large axial flow impeller provided with blades with tooth-shaped front edges |
| CN204900330U (en) * | 2015-08-06 | 2015-12-23 | 佛山市顺德区美的电热电器制造有限公司 | Fan wheel , centrifugal fan and domestic appliance |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI264500B (en) * | 2004-06-01 | 2006-10-21 | Sunonwealth Electr Mach Ind Co | Radial-flow heat-dissipating fan for increasing inlet airflow |
| ATE466195T1 (en) * | 2007-11-12 | 2010-05-15 | Elica Spa | WHEEL FOR A CENTRAL BLOWER AND CENTRAL BLOWER |
| CN204200676U (en) * | 2014-10-27 | 2015-03-11 | 安徽科达埃尔压缩机有限公司 | Centrifugal blower fan blade wheel |
| CN105179281A (en) * | 2015-10-12 | 2015-12-23 | 珠海格力电器股份有限公司 | Fan and air conditioning system comprising same |
-
2018
- 2018-07-17 CN CN201910995698.8A patent/CN110594192B/en active Active
- 2018-07-17 CN CN201810783627.7A patent/CN108953236B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20010065947A (en) * | 1999-12-30 | 2001-07-11 | 전완호 | A centrifugal impeller with flow guide blade for high performance, low noise |
| JP2005113770A (en) * | 2003-10-07 | 2005-04-28 | Daikin Ind Ltd | Centrifugal blower and air conditioner using it |
| CN1757932A (en) * | 2005-10-27 | 2006-04-12 | 陈瑜 | Impellor used for centrifugal pump and centrifugal type fan |
| DE102010002673A1 (en) * | 2010-03-09 | 2011-09-15 | Robert Bosch Gmbh | Hand tools fan |
| CN103835995A (en) * | 2012-11-22 | 2014-06-04 | 威海克莱特菲尔风机股份有限公司 | Large axial flow impeller provided with blades with tooth-shaped front edges |
| CN204900330U (en) * | 2015-08-06 | 2015-12-23 | 佛山市顺德区美的电热电器制造有限公司 | Fan wheel , centrifugal fan and domestic appliance |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114962346A (en) * | 2022-06-29 | 2022-08-30 | 江西镁淇实业有限公司 | Efficient treatment chamber for textile manufacturing process |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108953236A (en) | 2018-12-07 |
| CN110594192B (en) | 2020-11-17 |
| CN108953236B (en) | 2019-11-26 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20201030 Address after: No.55 qingneng Road, Jiading District, Shanghai 201800 Applicant after: Yingfei Tongren fan Co.,Ltd. Address before: 325600 Star Village, Tiancheng Town, Yueqing City, Zhejiang, Wenzhou Applicant before: Zhao Haohao |
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| TA01 | Transfer of patent application right | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of invention: A rotor structure for centrifugal fans Effective date of registration: 20231010 Granted publication date: 20201117 Pledgee: Wuding Road Sub branch of Bank of Shanghai Co.,Ltd. Pledgor: Yingfei Tongren fan Co.,Ltd. Registration number: Y2023980060618 |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right |