LU502075B1 - Sound insulation device suitable for filter capacitor in converter station - Google Patents
Sound insulation device suitable for filter capacitor in converter station Download PDFInfo
- Publication number
- LU502075B1 LU502075B1 LU502075A LU502075A LU502075B1 LU 502075 B1 LU502075 B1 LU 502075B1 LU 502075 A LU502075 A LU 502075A LU 502075 A LU502075 A LU 502075A LU 502075 B1 LU502075 B1 LU 502075B1
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- Prior art keywords
- sound
- capacitor
- shell
- insulation
- converter station
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- 239000003990 capacitor Substances 0.000 title claims abstract description 83
- 238000009413 insulation Methods 0.000 title claims abstract description 73
- 238000010521 absorption reaction Methods 0.000 claims abstract description 53
- 238000005192 partition Methods 0.000 claims abstract description 5
- 230000017525 heat dissipation Effects 0.000 abstract description 9
- 238000010586 diagram Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/172—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using resonance effects
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G2/00—Details of capacitors not covered by a single one of groups H01G4/00-H01G11/00
- H01G2/10—Housing; Encapsulation
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/162—Selection of materials
- G10K11/168—Plural layers of different materials, e.g. sandwiches
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G2/00—Details of capacitors not covered by a single one of groups H01G4/00-H01G11/00
- H01G2/08—Cooling arrangements; Heating arrangements; Ventilating arrangements
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Exhaust Silencers (AREA)
- Filters And Equalizers (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
Abstract
A sound insulation device suitable for a filter capacitor in a converter station is disclosed. The sound insulation device comprises sound absorption and insulation structures arranged at the top, the bottom and a group of opposite side faces of a shell of a capacitor, and sound attenuation structures arranged at another group of opposite side faces of the shell of the capacitor; the sound absorption and insulation structure is composed of sound absorption and insulation units distributed in an array manner, the sound absorption and insulation unit comprises a first panel, a middle labyrinth layer and a second panel which are laminated in sequence, and a perforation is formed in the panel close to one side of the shell of the capacitor; the middle labyrinth layer comprises a frame, an internal space of the frame is divided into a plurality of co-planar folding channels by partition plates, and the plurality of folding channels are communicated to one another at a center area of the frame, the center area being directly facing the position of the perforation. In accordance with the present disclosure, a plurality of harmonic noise with remarkable sound energy can be greatly reduced while the heat dissipation performance of the filter capacitor is guaranteed, and an excellent engineering application prospect is achieved.
Description
BL-5459 LU502075
[0001] The present disclosure relates to the technical field of sound absorption and sound insulation, and in particular relates to a sound insulation device suitable for a filter capacitor in a converter station.
[0002] In recent years, with the increasing voltage level of high-voltage DC transmission, the number and capacity of power equipment in the converter station are increasing, and the pollution problem of low-frequency noise radiated by the power equipment is of great public concern. In the high-voltage DC power transmission system, a large number of filter capacitors need to be configured to absorb a large amount of harmonic current generated during rectification and inversion. These capacitors may generate large noise under harmonic current excitation. Considering that a large number of filter capacitors are configured in the converter station in large density and are usually installed on higher capacitor towers, the noise of the filter capacitors has now become one of the main sources of converter station noise.
[0003] To reduce the noise radiated by the capacitor, micro-perforated plate resonance sound-absorbing structures are additionally provided at the top surface (sleeve side) and the bottom surface of the capacitor respectively by Huang Guoxing et al. to reduce the noise radiated by the capacitor. However, the micro-perforated plate resonance sound absorption structure generally requires a large back cavity to achieve low and medium-frequency sound absorption, and a sound absorption bandwidth thereof is narrower and is not enough to cover several major harmonic frequencies of the noise of the capacitor. A noise reduction device suitable for a power capacitor is disclosed in patent CN111785520A. The radiated noise of the power capacitor is reduced by arranging a totally-enclosed vibration reduction shell, and arranging a sponge layer and a vacuum tube in the shell. However, due to the poor heat dissipation ability of the sponge, although it is proposal to arrange a heat dissipator inside the capacitor, the implementation is too complicated, and effective convection cannot be formed due to closed internal space, thus the device is unsatisfactory in heat dissipation. A noise reduction device and noise reduction method of a power filter capacitor are disclosed in patent CN110767446A. The noise reduction device comprises a sound insulation shield and a sound absorption cavity structure which are arranged at the top and the bottom of a shell of the capacitor, respectively. However, such device can only be used to conduct sound insulation at the top and the bottom of the capacitor; although the sound pressure level of the noise radiated by the top and the bottom of the capacitor is higher than that of the noise radiated by the side faces of the capacitor, the radiated sound energy is still larger due to larger sound radiation areas at the side faces of the capacitor, and therefore the overall sound reduction index of the device is low. 1
BL-5459 SUMMARY LU502075
[0004] For the defects in the prior art, an objective of the present disclosure is to provide a sound insulation device suitable for a filter capacitor in a converter station, which may achieve efficient sound insulation while considering ventilation and heat dissipation.
[0005] The technical objective of the present disclosure is achieved through the following technical solutions:
[0006] A sound insulation device suitable for a filter capacitor in a converter station comprises sound absorption and insulation structures which are arranged at the top, the bottom and a group of opposite side faces of a shell of the capacitor, and sound attenuation structures arranged at another group of opposite side faces of the shell of the capacitor.
[0007] the sound absorption and insulation structure is composed of sound absorption and insulation units distributed in an array manner, the sound absorption and insulation unit comprises a first panel, a middle labyrinth layer and a second panel which are laminated in sequence, and a perforation 1s formed in the panel close to one side of the shell of the capacitor; the middle labyrinth layer comprises a frame, an internal space of which is divided into a plurality of co-planar folding channels by partition plates, and the plurality of folding channels are communicated to one another at a center area of the frame, the center area being directly facing a position of the perforation.
[0008] The sound attenuation structure is composed of sound attenuation units distributed in an array manner, the sound attenuation structure comprises a first perforated plate, the middle labyrinth layer and a second perforated plate which are laminated in sequence; and the middle labyrinth layer of the sound attenuation unit is identical in structure to the middle labyrinth layer of the sound absorption and insulation unit.
[0009] Preferably, a plurality of sound attenuation units arranged at equal intervals are arranged in the sound absorption and insulation structure at the top of the shell of the capacitor. That is, a part of the sound absorption and insulation units arranged at the top of the shell of the capacitor are replaced with the sound attenuation units to achieve the heat dissipation in the sound insulation device through natural convection, thus enhancing the heat dissipation capability of the capacitor. The number of the replaced units is a fraction of the total number of the sound absorption and insulation units.
[0010] Preferably, every two adjacent folding channels at the same side of the center area in the middle labyrinth are mutually wound, the various folding channels having the same width.
[0011] Preferably, the sound attenuation structures are arranged at two side faces of long sides of the shell of the capacitor, the sound attenuation structure at one of two sides is provided with small fans at equal intervals, and a spacing distance between every two adjacent small fans is a plurality of unit widths. The small fan is arranged at the perforation of the perforated plate at one side, opposite to the shell of the capacitor, of the sound attenuation unit, and an exhaust direction of the small fan is a direction opposite to the shell of the capacitor.
[0012] Preferably, the perforations on the first perforated plate and the second 2
BL-5459 perforated are both circular and consistent in size, thus avoiding the airflow regenerated LU502075 noise caused by uneven gaps between the small fans and the edges of the perforations where the small fans are located.
[0013] Preferably, there is a cavity between the sound absorption and insulation structure and the shell of the capacitor and between the sound attenuation structure and the shell of the capacitor, the cavity has a depth of not less than 2 cm, thus reducing the structure-borne sound transferred by the vibration of the shell of the capacitor.
[0014] Preferably, the sound absorption and insulation structure and the sound attenuation structure are both made of metal with high thermal conductivity, thus improving the heat dissipation capability of the capacitor.
[0015] Preferably, the sound insulation device is provided for a single capacitor or integrally provided for a plurality of adjacent capacitors.
[0016] The sound insulation device provided by the present disclosure has the beneficial effects that:
[0017] (1) A periodic unit structure is specifically designed according to noise frequency characteristic curves of a filter capacitor in a converter station, which can effectively reduce the noise radiated by the capacitor.
[0018] (2) The sound insulation device is made of the metal with high thermal conductivity, and cooling fans are arranged in part of the sound attenuation units to guarantee the good heat dissipation condition of the filter capacitor.
[0019] (3) The device has a thickness of only 2-3 cm, and is small in volume and light in mass, and good in engineering application prospect.
[0020] To describe the technical solutions in the embodiments of the present disclosure or in the prior art more clearly, the following briefly introduces the accompanying drawings required for describing the embodiments. Apparently, the accompanying drawings in the following description show merely some embodiments of the present disclosure, and those of ordinary skill in the art may still derive other drawings from these accompanying drawings without creative efforts.
[0021] FIG 1 is a typical noise spectrum of a capacitor in a filter field of a converter station;
[0022] FIG 2 is a diagram of overall installation of a sound insulation device suitable for a filter capacitor in a converter station in an embodiment of the present disclosure;
[0023] FIG 3 is a diagram of an overall structure of a sound absorption and insulation structure in an embodiment of the present disclosure;
[0024] FIG 4 is a structure diagram of a sound absorption and insulation unit in an embodiment of the present disclosure;
[0025] FIG 5 is a diagram of a middle labyrinth layer of a sound absorption and insulation unit in an embodiment of the present disclosure;
[0026] FIG 6 is a structure diagram of a sound attenuation unit in an embodiment of the present disclosure;
[0027] FIG 7 is an enlarged view of a part A in FIG. 2;
[0028] FIG 8 is a sound absorption coefficient simulating calculation result of a sound 3
BL-5459 absorption and insulation structure in an embodiment of the present disclosure; LU502075
[0029] FIG 9 is a sound reduction index simulating calculation result of a sound absorption and insulation structure in an embodiment of the present disclosure.
[0030] The following clearly and completely describes the technical solutions in the embodiments of the present disclosure with reference to the accompanying drawings in the embodiments of the present disclosure. Apparently, the described embodiments are merely a part rather than all of the embodiments of the present disclosure. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present disclosure without creative efforts shall fall within the protection scope of the present disclosure.
[0031] An objective of the present disclosure is to provide a sound insulation device suitable for a filter capacitor in a converter station to solve the problem in the prior art.
[0032] To make the objective, the features and the advantages of the present disclosure more obvious and understandable, the following further describes the present disclosure in detail with reference to the accompanying drawings and the specific embodiments.
[0033] A sound insulation device suitable for a filter capacitor in a converter station in the embodiment is as shown in FIG. 2, the sound insulation device suitable for the filter capacitor in the converter station comprises sound absorption and insulation structures 2 and sound attenuation structures 3 which are arranged at the outer side of a shell of a filter capacitor 1, wherein the sound absorption and insulation structures 3 are arranged at the top, the bottom and two side faces of short sides of the shell of the capacitor 1, and the sound attenuation structures 3 are arranged at two side faces of long sides of the shell of the capacitor 1. There is a cavity between the sound absorption and insulation structure 2 and the shell of the capacitor and between the sound attenuation structure 3 and the shell of the capacitor 1, the cavity having a depth of 3 cm.
[0034] As shown in FIGS. 3-7, the sound absorption and insulation structure 2 is composed of sound absorption and insulation units 21 distributed in a rectangular array mode, each sound absorption and insulation unit 21 comprises a first panel 211, a middle labyrinth layer 212 and a second panel 213 which are laminated in sequence, and a square perforation is formed in the center of the panel close to one side of the shell of the capacitor 1; an outer frame of the middle labyrinth layer 212 is a closed rectangular frame, an internal space of which is divided into four co-planar folding channels by a plurality of partition plates, and the four folding channels both take the center area of the frame as a starting point and take the partition plates at the tail ends of the folding channels as end points; the four channels are intersected in the center area, and every two adjacent folding channels located on the same side of the center area are mutually wound; and the center area corresponds to the square perforation position.
[0035] The length and the width of the sound absorption and insulation unit 21 are both d, d=90 mm; the thicknesses of the first panel 211 and the second panel 213 are both h, h=1 mm; the thickness H of the middle labyrinth layer 212 is 20 mm; and the square perforation at the center of the panel close to one side of the shell of the capacitor 1 has a side length a of 20 mm. All four folding channels of the middle labyrinth layer 212 4
BL-5459 have a width w of 8 mm, and the lengths of the channel 1, the channel 2, the channel 3, LU502075 and the channel 4 are 1 1=127 mm, 1 2=137 mm, 1 3=169 mm and | 4=208 mm, respectively.
[0036] The sound attenuation structure 3 is composed of attenuation units 31 distributed in a rectangular array mode, the attenuation unit 31 comprises a first perforated plate 311, a middle labyrinth layer 312 and a second perforated plate 313 which are laminated in sequence; wherein the middle labyrinth layer 312 of the sound attenuation unit 31 is identical in structure to the middle labyrinth layer 212 of the sound absorption and insulation unit 21; the perforations of the first perforated plate 311 and the second perforated plate 313 are both circular and have an aperture of 20 mm; and the first perforated plate 311 and the second perforated plate 313 both have a thickness of 1 mm.
[0037] Wherein the sound attenuation structure 3 at one of two sides is provided with small fans 4 at equal intervals, and a spacing distance between every two adjacent small fans 4 is 180 mm. The small fan 4 is specifically arranged at the perforation of the perforated plate at one side, opposite to the shell of the capacitor 1, of the sound attenuation unit 31, and an exhaust direction of the small fan 4 is a direction opposite to the shell of the capacitor 1.
[0038] In this embodiment, to further enhance the heat dissipation capability of the capacitor, two sound absorption and insulation units 21 in the sound absorption and insulation structure 2 at the top of the shell of the capacitor 1 are replaced with the sound attenuation units 31, thus forming a natural convection condition in the sound insulation device. Meanwhile, the sound absorption and insulation structure 2 and the sound attenuation structure 3 are both made of aluminum alloy with excellent thermal conductivity, with specific material parameters as follows: density p=2,730 kg/m’, Young’s modulus E=69 Gpa, and Poisson’s ratio v=0.33.
[0039] In accordance with noise spectrum characteristics of the capacitor in the filter field in the converter station, as shown in FIG 1, the noise radiated by the capacitor is mainly low and medium frequency noise and has obvious harmonic characteristics, and in particularly, the sound energy on 400 Hz, 500 Hz, 600 Hz and 700 Hz harmonic waves is remarkable. To this end, by taking the 400 Hz, 500 Hz, 600 Hz and 700 Hz as the target frequencies, the lengths of four folding sound channels in the middle labyrinth layers of the sound absorption and insulation unit and the sound attenuation units are designed. The length of each folding sound channel is 1/4 of a corresponding wavelength of the target frequency. When sound waves are incident to the sound absorption and insulation unit or the sound attenuation unit, the sound waves enter the folding channel of the middle labyrinth layer along the perforation of the panel or the perforated plate, and due to the fact that the sound waves are reflected at the tail end of the folding channel and then returns to the perforation in a path difference of exactly 1/2 of the corresponding wavelength of the target frequency, the frequency sound waves generate destructive interference at the perforation of the panel or the perforated plate. Hence, the sound energy at the perforation of the panel or the perforated plate is tiny, and most of sound energy is gathered in the folding channel. Due to the presence of thermal viscous loss during propagation of the sound waves in the folding channel, the
BL-5459 sound energy gathered in the folding channel is converted into heat energy to be LU502075 consumed, thus achieving efficient sound absorption to the target frequency noise, and then generating high sound reduction index.
[0040] To verify the sound absorption and insulation performance of the sound absorption and insulation structure, COMSOL Multiphysics 5.5 is used to perform simulating calculation on the sound absorption and insulation unit 21, with a calculation result shown in FIG 8 and FIG 9. It can be known from FIG 8 that the sound absorption and insulation structure 2 has high sound absorption coefficients at 400 Hz, 500 Hz, 600 Hz and 700 Hz, the sound absorption coefficients being both greater than
0.9. It can be known from FIG. 9 that the sound reduction index of the sound absorption and insulation structure 2 has a significant increase at 400 Hz, 500 Hz, 600 Hz and 700 Hz in comparison with a mass law curve, with the increase capacity of 4-8 dB. Therefore, the sound absorption and insulation structure 2 can effectively reduce several harmonic components with remarkable sound energy in transformer noise.
[0041] Several examples are used for illustration of the principles and implementation methods of the present disclosure. The description of the embodiments is merely used to help illustrate the method and its core principles of the present disclosure. In addition, those of ordinary skill in the art can make various modifications in terms of specific embodiments and scope of application in accordance with the teachings of the present disclosure. In conclusion, the content of this specification shall not be construed as a limitation to the present disclosure.
6
Claims (8)
1. A sound insulation device suitable for a filter capacitor in a converter station, comprising sound absorption and insulation structures arranged at the top, the bottom and a group of opposite side faces of a shell of a capacitor, and sound attenuation structures arranged at another group of opposite side faces of the shell of the capacitor; the sound absorption and insulation structure is composed of sound absorption and insulation units distributed in an array manner, the sound absorption and insulation unit comprises a first panel, a middle labyrinth layer and a second panel which are laminated in sequence, and a perforation is formed in the panel close to one side of the shell of the capacitor; the middle labyrinth layer comprises a frame, an internal space of the frame is divided into a plurality of co-planar folding channels by partition plates, and the plurality of folding channels are communicated to one another at a center area of the frame, the center area being directly facing a position of the perforation.
2. The sound insulation device suitable for the filter capacitor in the converter station according to claim 1, wherein the sound attenuation structure is composed of sound attenuation units distributed in an array manner, and the sound attenuation unit comprises a first perforated plate, a middle labyrinth layer and a second perforated plate which are laminated in sequence.
3. The sound insulation device suitable for the filter capacitor in the converter station according to claim 2, wherein a plurality of sound attenuation units arranged at equal intervals are arranged in the sound absorption and insulation structure at the top of the shell of the capacitor.
4. The sound insulation device suitable for the filter capacitor in the converter station according to claim 1 or 2, wherein every two adjacent folding channels at the same side of the center area in the middle labyrinth layer are mutually wound, and various folding channels have the same width.
5. The sound insulation device suitable for the filter capacitor in the converter station according to claim 2, wherein the sound attenuation structures are arranged at two side faces of long sides of the shell of the capacitor, the sound attenuation structure at one of two sides is provided with small fans at equal intervals; the small fan is arranged at a perforation of the perforated plate at one side, opposite to the shell of the capacitor, of the sound attenuation unit, and an exhaust direction of the small fan is a direction opposite to the shell of the capacitor.
6. The sound insulation device suitable for the filter capacitor in the converter station according to claim 2 or 5, wherein the perforations on the first perforated plate and the second perforated plate are both circular and are consistent in size.
7. The sound insulation device suitable for the filter capacitor in the converter station according to claim 1, wherein a cavity is reserved between the sound absorption and insulation structure and the shell of the capacitor and between the sound attenuation structure and the shell of the capacitor, the cavity having a depth of not less than 2 cm.
8. The sound insulation device suitable for the filter capacitor in the converter station according to claim 1, wherein the sound insulation device is provided for a single capacitor or integrally provided for a plurality of adjacent capacitors.
7
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110676429.2A CN113421773B (en) | 2021-06-18 | 2021-06-18 | Sound insulation device suitable for filter capacitor of converter station |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| LU502075B1 true LU502075B1 (en) | 2022-12-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| LU502075A LU502075B1 (en) | 2021-06-18 | 2022-02-23 | Sound insulation device suitable for filter capacitor in converter station |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN113421773B (en) |
| LU (1) | LU502075B1 (en) |
| WO (1) | WO2022262301A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113421773B (en) * | 2021-06-18 | 2022-06-10 | 浙江大学 | Sound insulation device suitable for filter capacitor of converter station |
| CN113915651A (en) * | 2021-09-28 | 2022-01-11 | 浙江大学 | Noise eliminator suitable for integrated kitchen |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202865760U (en) * | 2012-07-27 | 2013-04-10 | 李琳 | Sound barrier panel |
| CN206711769U (en) * | 2017-05-25 | 2017-12-05 | 合容电气股份有限公司 | A kind of capacitor denoising structure with noise reduction side plate |
| CN207868067U (en) * | 2017-12-26 | 2018-09-14 | 江西鑫尔利电力科技有限公司 | A kind of low-noise electrical capacitor |
| CN209855103U (en) * | 2019-04-22 | 2019-12-27 | 南京林业大学 | Light wood structure wall with low-frequency noise reduction and sound absorption performance |
| CN111933100A (en) * | 2020-09-18 | 2020-11-13 | 株洲国创轨道科技有限公司 | Sound absorption device |
| CN113421773B (en) * | 2021-06-18 | 2022-06-10 | 浙江大学 | Sound insulation device suitable for filter capacitor of converter station |
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2021
- 2021-06-18 CN CN202110676429.2A patent/CN113421773B/en active Active
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2022
- 2022-02-23 LU LU502075A patent/LU502075B1/en active
- 2022-02-23 WO PCT/CN2022/077345 patent/WO2022262301A1/en active Application Filing
Also Published As
| Publication number | Publication date |
|---|---|
| CN113421773A (en) | 2021-09-21 |
| CN113421773B (en) | 2022-06-10 |
| WO2022262301A1 (en) | 2022-12-22 |
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