CN116557239A - Electrothermal deicing device of wind generating set - Google Patents
Electrothermal deicing device of wind generating set Download PDFInfo
- Publication number
- CN116557239A CN116557239A CN202310621722.8A CN202310621722A CN116557239A CN 116557239 A CN116557239 A CN 116557239A CN 202310621722 A CN202310621722 A CN 202310621722A CN 116557239 A CN116557239 A CN 116557239A
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- China
- Prior art keywords
- heating element
- blade
- windward
- isolation layer
- leeward
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- Pending
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- 238000010438 heat treatment Methods 0.000 claims abstract description 130
- 238000002955 isolation Methods 0.000 claims abstract description 40
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 8
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 8
- 239000004917 carbon fiber Substances 0.000 claims description 8
- 239000004744 fabric Substances 0.000 claims description 8
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 8
- 238000009954 braiding Methods 0.000 claims description 4
- 229910052799 carbon Inorganic materials 0.000 claims description 4
- 239000011521 glass Substances 0.000 claims description 4
- 229910021389 graphene Inorganic materials 0.000 claims description 4
- 230000004888 barrier function Effects 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 229920002635 polyurethane Polymers 0.000 claims description 3
- 239000004814 polyurethane Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 239000011248 coating agent Substances 0.000 description 5
- 238000000576 coating method Methods 0.000 description 5
- 230000002829 reductive effect Effects 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 239000000428 dust Substances 0.000 description 2
- 230000000670 limiting effect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 206010033799 Paralysis Diseases 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000010977 unit operation Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D80/00—Details, components or accessories not provided for in groups F03D1/00 - F03D17/00
- F03D80/60—Cooling or heating of wind motors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D80/00—Details, components or accessories not provided for in groups F03D1/00 - F03D17/00
- F03D80/40—Ice detection; De-icing means
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Resistance Heating (AREA)
Abstract
The invention provides an electrothermal deicing device of a wind generating set, which comprises a heating element, a first isolation layer, a second isolation layer and a power supply, wherein the heating element is arranged on the first isolation layer; the heating element is positioned on the outer surface of the blade including the front edge joint seam area of the blade; the first isolation layer is positioned above the heating element except for the die joint seam area of the front edge of the blade; the second isolation layer is arranged above the heating element in the front edge mold clamping seam area of the blade and uniformly transits to the first isolation layer outside the front edge mold clamping seam area of the blade, and is used for protecting the heating element below and the front edge mold clamping seam area of the blade.
Description
Technical Field
The invention belongs to the technical field of generator blade deicing, and particularly relates to an electrothermal deicing device of a wind generating set.
Background
At present, the wind driven generator in China is usually installed in mountainous areas or elevations with high altitude, low temperature and high humidity, particularly in southern China, the wind driven generator is mostly located in the mountainous areas with high altitude, the outer surfaces of wind driven generator blades are extremely easy to cover ice along with the temperature reduction and the humidity increase in autumn and winter and spring, particularly in southern China, the wind driven generator blades are especially easy to freeze in winter, and the southern China is frozen with much frost and rain, and the icing is more serious than that in northern China. The fan is frozen to easily cause the fan operation power to be rapidly reduced or even shut down, and meanwhile, the fan operation vibration is possibly caused by the increase of the fan load due to the newly added mass to endanger the unit operation, so that a large amount of power generation loss is caused to a wind field by the fan freezing.
The existing wind power deicing technology is relatively mature, but certain defects still exist in actual use, as the front edge die closing seam area of the blade can be impacted with rainwater or sand dust in the air at high speed in the running process of the blade, the front edge die closing seam area of the blade is easy to corrode, and further the electrothermal deicing element acting on the front edge die closing seam area is easy to damage, so that the whole electrothermal deicing element is influenced, but the existing electrothermal deicing element lacks a specific protection means for the front edge die closing seam area of the blade, the whole electrothermal deicing element is paralyzed due to the damage of the electrothermal deicing element in the front edge die closing seam area of the blade, and the service life of the electrothermal deicing element is greatly reduced.
Therefore, the electric heating deicing device capable of providing targeted protection for the easily-appearing corrosion phenomenon in the die joint area of the front edge of the blade is a technical problem to be solved in the field.
Disclosure of Invention
The invention provides a electrothermal deicing device of a wind generating set, and aims to solve the technical problem of prolonging the service life of electrothermal deicing elements in a die joint area of the front edge of a blade of the wind generating set.
The invention is realized in such a way that the electrothermal deicing device of the wind generating set comprises a heating element, a first isolation layer, a second isolation layer and a power supply; the heating element is positioned on the outer surface of the blade including the front edge clamping seam area of the blade and is used for providing heat required by deicing the blade after being connected with a power supply; the first isolation layer is positioned above the heating element except for a die joint seam area of the front edge of the blade and is used for protecting the heating element below; the second isolation layer is positioned above the heating element in the die joint seam area of the front edge of the blade; and the thickness of the second isolation layer is higher than that of the first isolation layer, so as to protect the heating element below.
Optionally, the second isolation layer is made of polyurethane.
Optionally, the heating element comprises at least one windward heating element located on the windward side of the blade of the wind generating set and at least one leeward heating element located at the front edge clamping seam.
Optionally, the heating element may be made of carbon fiber cloth, graphene, or carbon glass mixture.
Optionally, the heating element is made of carbon fiber cloth in a way of biaxial braiding at +/-45 ℃.
Optionally, an electrical connector is arranged between the windward heating element and the leeward heating element, and is used for connecting the windward heating element and the leeward heating element electrically in sequence and then connecting the windward heating element and the leeward heating element with a power supply to form a single power supply heating loop.
Optionally, the electrical connector comprises a windward electrode, a leeward electrode and an end electrode; the windward electrode is positioned at one end of the windward heating element, which is close to the blade root of the blade; the leeward electrode is positioned at one end of the leeward heating element, which is close to the blade root of the blade; the end electrode is positioned at one end of the windward heating element and the leeward heating element, which is close to the tip of the blade.
Optionally, the windward heating element is in a linear folded shape with a width near the blade root and gradually narrowing towards the blade tip.
Optionally, reserved connection areas for installing electronic elements are further arranged at two ends of the heating element.
Optionally, the electronic component mounting position in the reserved connection area is located below the heating element.
The beneficial technical effects of implementing the invention are as follows: by applying the technical scheme of the invention, as the first isolation layer is paved above the heating element, the service life of the heating element can be effectively prolonged, and particularly, the second isolation layer is paved above the heating element in the front edge die clamping seam area of the blade, the key protection of the heating element can be realized, and the technical problem that the service life of the traditional electrothermal deicing element in the front edge die clamping seam area of the blade is lower is solved.
Drawings
FIG. 1 is a schematic installation view of the present invention;
FIG. 2 is a schematic view of the present invention deployed and installed along a blade leading edge seam;
fig. 3 is a schematic diagram of a reserved splicing area according to the present invention.
In the figure: 1. a heating element; 11. a windward heating element; 12. a leeward heating element; 2. a first isolation layer; 3. a leading edge protective material; 4. an electrical connection; 41. a windward electrode; 42. a leeward electrode; 43. an end electrode; 5. and reserving a splicing area.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
The invention will be described in detail below with reference to the drawings in connection with embodiments.
As shown in fig. 1-3, the invention provides a electrothermal deicing device of a wind generating set, which comprises a heating element 1, a first isolation layer 2, a second isolation layer 3 and a power supply; the heating element 1 is positioned on the outer surface of the blade including the front edge seam area of the blade and is used for providing heat required for deicing the blade after being connected with a power supply; the first isolation layer 2 is positioned above the heating element 1 except for the die joint seam area of the front edge of the blade and is used for protecting the heating element 1 below; the second isolation layer 3 is positioned above the heating element 1 in the die joint area of the front edge of the blade; and the thickness of the second insulating layer 3 is higher than the thickness of the first insulating layer 2 for protecting the heating element 1 underneath.
In the embodiment, the electrothermal deicing device of the wind generating set is provided, on one hand, the setting range of the heating element 1 is the periphery of the wind generating set blade, and the electrothermal deicing device comprises a front edge die clamping seam area, so that the periphery of the blade is covered with a part easy to freeze, and the periphery of the blade is heated and deicing in a full range; on the other hand, the heating element 1 in the front edge seam region and the other regions is provided with the first separator layer 2 and the second separator layer 3 having different thicknesses, respectively, and has various advantages: 1. the front edge mold closing seam area can collide with rainwater or sand dust in the air at high speed in the running process of the blade, so that corrosion is easy to occur, and the thickened second isolation layer 3 can effectively protect the heating element 1 and the blade in the area; on the basis, the second isolation layer 3 is higher than the first isolation layer 2, so that rainwater and the like can fall down rapidly, the residence time of the rainwater and the like on the blades is reduced, the erosion loss degree is further reduced, and the service life of the deicing device is prolonged; 2. the corrosion phenomena in other areas of the blade are relatively light, and the choice of a first insulating layer 2 of a relatively thin thickness in these areas, while protecting the heating element 1, allows to further reduce the cost of the invention.
In this embodiment, a preferred embodiment of a electrothermal deicing apparatus for a wind turbine generator system is provided, when a deicing apparatus is required to be installed on a blade of a wind turbine generator system, firstly, the wind turbine generator is turned off to enable the blade to be in a static state, then, a heating element 1 is installed on the outer surface of the blade including a blade front edge clamping seam area, preferably an ice prone area, then, a first isolation layer 2 is uniformly covered above the heating element 1 except the blade front edge clamping seam area, the blade front edge clamping seam area is left, then, a thicker second isolation layer 3 is coated on the left area, the second isolation layer 3 is uniformly transited to the positions above the first isolation layers 2 on two sides of the left area, finally, a power supply is connected with the heating element 1, and therefore, the effect of protecting the heating element 1 and protecting the heating element 1 outside the blade front edge clamping seam area in a targeted manner can be achieved.
Specifically, the power source may be electric energy generated by the wind driven generator itself or an external power source, so long as it can provide electric energy for the heating element 1. The size, shape, number, etc. of the heating elements 1 can be set arbitrarily by a person skilled in the art according to the actual situation, as long as they can effectively cover the outer surface of the blade, in particular the outer surface of the ice prone position.
More preferably, the first barrier layer 2 and the second barrier layer 3 are optionally but not limited to the same material. Preferably, the first isolation layer 2 is made of rubber material, but not limited to; the main material of the second separator 3 is optionally but not exclusively polyurethane.
In this embodiment, a preferable example of the manner of coating the second separator 3 is given, the first coating, the blade surface is roughened by polishing, then the paint is scraped out using a glue gun, and then scraped off with a scraper to be flush with the first separator; after the blade is naturally cured for 60min, the operation is repeated for the second coating, and the surface of the coating is pressed by hands without marks, so that the coating has slightly sticky touch feeling.
Preferably, the heating element 1 comprises at least one windward heating element 11 located on the windward side of the wind power plant blade and at least one leeward heating element 12 located at the leading edge seam.
In this embodiment, a preferred embodiment of the present invention is given, when the deicing device is required to be installed on the installed blade of the wind generating set, firstly, the wind generating set is turned off to enable the blade to be in a static state, then the windward heating member 11 is installed on the windward side of the blade, the leeward heating member 12 is installed at the front edge die clamping seam, the power supply is connected with the windward heating member 11 and the leeward heating member 12, then the first isolation layer 2 is uniformly covered on the windward heating member 11 and the leeward heating member 12, and it is noted that when the first isolation layer 2 above the leeward heating member 12 is installed, the front edge die clamping seam area of the blade needs to be left out, then the second isolation layer 3 is coated on the free area, and the second isolation layer 3 is uniformly transited to the first isolation layer 2 on both sides of the free area, so as to ensure specific protection of the front edge die clamping seam area of the blade.
More preferably, the heating element 1 can be made of carbon fiber cloth, graphene or carbon glass mixed material.
Specifically, in this embodiment, the heating element 1 made of carbon fiber cloth, graphene, carbon glass mixture and other materials is beneficial to solving the problem of heating uniformity in the existing heating element, and improving the use effect of the invention.
More preferably, the heating element 1 is made of carbon fiber cloth in a way of biaxial braiding at + -45 ℃.
Specifically, in this embodiment, the heating element 1 made of carbon fiber cloth in a form of biaxial braiding at ±45 ℃ has the best heating uniformity among the above materials, and can effectively improve the use effect of the present invention.
Preferably, an electric connector 4 is arranged between the windward heating element 11 and the leeward heating element 12, and is used for connecting the windward heating element 11 and the leeward heating element 12 electrically in sequence and then connecting with a power supply to form a single power supply heating loop.
Specifically, in this embodiment, the electric connector 4 is used to electrically connect the windward heating element 11 and the leeward heating element 12 sequentially and then connect with a power supply, so as to form a single power supply heating circuit, which is beneficial to the connection of power supply connection, improves the installation efficiency of the invention, and reduces the installation difficulty.
More specifically, the single-power-supply heating circuit can be specifically a two-phase 690V heating circuit, and under 690V voltage output, the heating deicing effect of the heating element 1 can be effectively ensured, and meanwhile, the energy consumption is reduced.
Preferably, the electrical connection 4 comprises a windward electrode 41, a leeward electrode 42 and an end electrode 43; the windward electrode 41 is positioned at one end of the windward heating element 11 close to the blade root; a leeward electrode 42 located at an end of the leeward heating element 12 adjacent to the blade root; the end electrode 43 is located at one end of the windward heating element 11 and the leeward heating element 122 near the blade tip.
Specifically, in this embodiment, the windward electrode 41 is used to constitute a heating circuit, and electric power is input to an input circuit of the windward heating member 11; the leeward electrode 42 is used to form an output circuit for outputting electric power from the leeward heating element 12 in the heating circuit; the end electrode 43 is used for connecting the windward heating element 11 and the leeward heating element 12 to form a transmission circuit for transmitting the electric energy of the windward heating film 11 into the leeward heating film 12 in the heating circuit.
More specifically, the windward electrode 41, the leeward electrode 42 and the end electrode 43 are all installed in a concealed manner by opening holes in the blade shell, so as to facilitate the installation of equipment wires.
Preferably, the windward heating element 11 has a shape of a linear taper that is wide on the side closer to the blade root and gradually narrows towards the side closer to the blade tip.
Specifically, because wind speeds of different positions of the blade of the wind generating set are in a direct proportion relation with the distance between the wind speeds and the blade roots, the wind speed and the heat exchange of the blade tip area are larger than those of the blade tip part when the blade operates, the power required for deicing the blade tip position is higher than that of the blade root position, and in order to adapt to the structural characteristics of the blade, the windward heating element 11 adopts a linearly folded shape which is wide at one side close to the blade root and gradually narrows towards one side close to the blade tip, thereby being beneficial to improving the power density of a heating film at the blade tip position and improving the deicing effect.
Preferably, the heating element 1 is also provided with reserved connection areas 5 at both ends for mounting electronic components.
Specifically, electronic elements such as a temperature sensor and/or a humidity sensor are installed in the reserved leading area 5, the electronic elements such as the temperature sensor and/or the humidity sensor are used for monitoring information such as temperature and humidity of the environment where the wind generating set blades are located, and the monitored data are used for better adjusting the temperature and the duration of the windward heating element 11 and the leeward heating element 12.
Preferably, the electronic component mounting position in the reserved lead area 5 is located below the heating element 1.
Specifically, the electronic components such as the temperature sensor and/or the humidity sensor are arranged at the lower part of the heating element 1, the first isolation layer 2 is arranged at the upper layer of the heating element 1, and the cables of the electronic components such as the temperature sensor and/or the humidity sensor are led out from the side surface of the heating element 1, and the electronic components such as the temperature sensor and/or the humidity sensor can be in the types of optical fibers, resistors and the like.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (10)
1. The electrothermal deicing device of the wind generating set is characterized by comprising a heating element (1), a first isolation layer (2), a second isolation layer (3) and a power supply;
the heating element (1) is positioned on the outer surface of the blade, including the front edge seam area of the blade, and is used for providing heat required by deicing the blade after being connected with a power supply;
the first isolation layer (2) is positioned above the heating element (1) except for a die joint seam area of the front edge of the blade and is used for protecting the heating element (1) below;
the second isolation layer (3) is positioned above the heating element (1) in the die joint area of the front edge of the blade; and the thickness of the second isolation layer (3) is higher than that of the first isolation layer (2) for protecting the heating element (1) below.
2. A wind turbine generator system electrothermal ice detachment apparatus according to claim 1, wherein the second barrier layer (3) is made of polyurethane.
3. A wind power plant electrothermal deicing apparatus according to claim 1, wherein the heating element (1) comprises at least one windward heating element (11) located on the windward side of a wind power plant blade and at least one leeward heating element (12) located at a leading edge seam.
4. A wind generating set electrothermal deicing apparatus according to claim 3, wherein the heating element (1) is made of carbon fiber cloth, graphene, or carbon glass mixture.
5. A wind generating set electrothermal ice detachment apparatus as claimed in claim 4, wherein the heating element (1) is made of carbon fiber cloth by biaxial braiding at ±45 ℃.
6. A electrothermal deicing device for a wind turbine generator system according to claim 3, wherein an electrical connector (4) is disposed between the windward side heating element (11) and the leeward side heating element (12), and is configured to electrically connect the windward side heating element (11) and the leeward side heating element (12) in sequence, and then connect with a power supply to form a single power supply heating circuit.
7. A wind power plant electrothermal ice detachment apparatus as claimed in claim 6, wherein the electrical connection (4) comprises a windward electrode (41), a leeward electrode (42) and an end electrode (43);
the windward electrode (41) is positioned at one end of the windward heating element (11) close to the blade root;
a leeward electrode (42) positioned at one end of the leeward heating element (12) close to the blade root of the blade;
and the end electrode (43) is positioned at one end of the windward heating element (11) and the leeward heating element (122) close to the blade tip.
8. A electrothermal ice detachment apparatus for a wind turbine generator system according to claim 7, wherein the windward heating member (11) has a shape of a linear folded shape that is wide on a side close to the blade root and gradually narrows toward a side close to the blade tip.
9. A wind generating set electrothermal ice detachment apparatus as claimed in claim 8, wherein the heating element (1) is further provided with reserved connection areas (5) at both ends for mounting electronic components.
10. A wind power plant electrothermal ice detachment apparatus according to claim 9, wherein the location of the electronic component mounting in the reserved connection area (5) is located below the heating element (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310621722.8A CN116557239A (en) | 2023-05-30 | 2023-05-30 | Electrothermal deicing device of wind generating set |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310621722.8A CN116557239A (en) | 2023-05-30 | 2023-05-30 | Electrothermal deicing device of wind generating set |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116557239A true CN116557239A (en) | 2023-08-08 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310621722.8A Pending CN116557239A (en) | 2023-05-30 | 2023-05-30 | Electrothermal deicing device of wind generating set |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116557239A (en) |
-
2023
- 2023-05-30 CN CN202310621722.8A patent/CN116557239A/en active Pending
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