CN111312505B - Vacuum quantitative oil injection method for transformer - Google Patents
Vacuum quantitative oil injection method for transformer Download PDFInfo
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- CN111312505B CN111312505B CN202010127460.6A CN202010127460A CN111312505B CN 111312505 B CN111312505 B CN 111312505B CN 202010127460 A CN202010127460 A CN 202010127460A CN 111312505 B CN111312505 B CN 111312505B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/08—Cooling; Ventilating
- H01F27/10—Liquid cooling
- H01F27/12—Oil cooling
- H01F27/14—Expansion chambers; Oil conservators; Gas cushions; Arrangements for purifying, drying, or filling
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- Engineering & Computer Science (AREA)
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- Manufacturing & Machinery (AREA)
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Abstract
The vacuum quantitative oil injection method for the transformer can simultaneously inject oil into a plurality of transformers, and has high efficiency; when oil is filled, the oil filling amount of each transformer is set in the controller; starting a vacuumizing unit to simultaneously vacuumize the oil storage tank and the vacuum tank to a full vacuum state; then, opening an oil way sub-control electromagnetic valve to fill oil to each transformer, and meanwhile, the vacuumizing unit is not stopped; when the oil injection amount of a certain transformer reaches a set value, closing the oil path sub-control electromagnetic valves corresponding to the transformer until all the oil path sub-control electromagnetic valves are closed; and finally, continuously vacuumizing and degassing to finish the oil injection process. The method performs quantitative oil injection on the transformer, and the controller controls the valve to be automatically closed after the oil injection amount reaches a set value, so that the operation is convenient and reliable; during oil injection, the vacuum tank and the oil storage tank are vacuumized together, so that the oil storage tank and the vacuum tank are kept at the same vacuum degree, the oil injection speed is reduced, bubbles are hardly entrained in hydraulic oil during oil injection, and bubble foam is prevented from being generated in the oil injection process.
Description
Technical Field
The invention relates to the technical field of transformer production, in particular to a vacuum quantitative oil injection method for a transformer.
Background
A transformer is a conversion device that changes an alternating voltage using the principle of electromagnetic induction, and is widely used in the power industry, and its main components are a primary coil, a secondary coil, and an iron core (magnetic core). The transformer can be divided into a dry-type transformer and an oil-immersed transformer according to a cooling mode, wherein the oil-immersed transformer is a distribution transformer adopting transformer oil for heat dissipation, is a novel high-performance transformer with more reasonable structure and better performance, and is one of important devices in power supply and distribution systems of industrial and mining enterprises and civil buildings. After the oil-immersed transformer is assembled, the transformer oil needs to be filled in a vacuum state.
The in-tank vacuum oil injection in the prior art refers to a process that after the transformer is completely assembled, the transformer is placed in a vacuumizing tank, the transformer and the vacuum tank are vacuumized together (generally 133Pa), then vacuumizing and oil injection are carried out, and vacuumizing and degassing are continued after the oil injection is finished. The process can effectively remove moisture and gas in the transformer insulation and the transformer oil. In-tank vacuum oil injection is commonly used for injecting oil into small transformers such as distribution transformers, amorphous alloy transformers and small-capacity 35kV transformers. However, in the existing in-tank vacuum oil injection technology, the oil injection speed is too high, bubbles are entrained in the transformer oil during oil injection, and in the oil injection process, the transformer oil impacts the liquid level to generate a lot of air bubbles, often the true oil level is only 2/3 of the oil tank, but the air bubbles at the upper part reach the top of the oil tank and overflow from the top.
In addition, transformer manufacturers usually adopt a float liquid level meter oil level alarm to judge the oil filling amount in an oil tank, but because the oil level alarm is arranged at a position where a lead, the oil tank, a clamping piece and the like interfere with each other, a floating ball can not normally float, so that even if transformer oil is full of the oil tank, an alarm signal can not be sent; meanwhile, because an oil level alarm needs to be installed, a mounting hole needs to be specially reserved on the oil tank during transformer design, or a sleeve mounting hole is used, so that a sleeve needs to be installed again after oil injection is completed, and the process is complex.
Disclosure of Invention
The invention aims to provide a vacuum quantitative oil injection method for a transformer; the method has the advantages that the vacuum tank and the oil storage tank are vacuumized together during oil injection, so that the oil storage tank and the vacuum tank are kept in the same vacuum degree, the oil injection speed is reduced, and the hydraulic oil during oil injection is hardly entrained with bubbles, so that bubble foam is avoided from being generated during the oil injection process, and the process operation is more convenient and reliable; moreover, the oil injection method performs quantitative oil injection on the transformer, and after the oil injection amount reaches a set value, the controller controls the valve to be automatically closed, so that the operation is further more convenient and reliable from another aspect; in addition, the oil injection method can simultaneously inject oil into a plurality of transformers, and has the advantage of high working efficiency.
The technical scheme of the invention is as follows: the method for quantitatively injecting transformer oil under vacuum comprises connecting an oil storage tank containing transformer oil with at least one oil tank of a transformer through an oil injection pipeline to form an oil way system; the transformer is arranged inside the vacuum tank; the oil filling pipeline is provided with an oil way sub-control electromagnetic valve for controlling the oil filling amount of each transformer and a flow meter for monitoring the oil filling amount of each transformer corresponding to each transformer; the oil storage tank and the vacuum tank are respectively connected with the vacuumizing unit through vacuum pipelines to form a vacuum system; the vacuum pipeline is provided with air pressure control valves corresponding to the oil storage tank and the vacuum tank respectively; the vacuumizing unit, the oil way sub-control electromagnetic valve, the flow meter and the air pressure control valve are all connected with a controller;
when oil is filled, the oil filling amount of each transformer is set in the controller; starting a vacuumizing unit to simultaneously vacuumize the oil storage tank and the vacuum tank to a full vacuum state; then, opening an oil way sub-control electromagnetic valve to fill oil to each transformer, and meanwhile, the vacuumizing unit is not stopped; when the oil injection amount of a certain transformer reaches a set value, closing the oil path sub-control electromagnetic valves corresponding to the transformer until all the oil path sub-control electromagnetic valves are closed; and finally, continuously vacuumizing and degassing to finish the oil injection process.
Compared with the prior art, the vacuum quantitative oil injection method for the transformer has the following remarkable progress:
(1) the early preparation work is simple, and after the transformer is pushed into the vacuum tank, the oil injection pipeline is connected with the transformer, so that the operation efficiency is improved;
(2) during oil injection, the vacuum tank and the oil storage tank are vacuumized together, so that the oil storage tank and the vacuum tank are kept in the same vacuum degree, hydraulic oil flows into the transformer oil tank only under the action of gravity during oil injection, the oil injection speed is reduced, the oil speed can be controlled to be less than or equal to 8L/min, air bubbles are hardly entrained in the hydraulic oil during oil injection, and the generation of air bubbles during oil injection is avoided, so that even if the oil level is slightly higher during oil injection, the oil cannot overflow from the top of the oil tank, and the process operation is more convenient and reliable;
(3) the oil injection control mode is changed from the original oil level alarm mode into a quantitative oil injection mode, the oil injection amount is set in the controller and then quantitative oil injection is carried out, the oil way branch control electromagnetic valve is automatically cut off after the oil injection amount reaches a set value, oil injection is stopped, the oil injection process is simple and reliable, oil overflow from an oil tank due to the fault of an oil level alarm in the oil injection process is avoided, an operator can complete other work within the waiting time without paying attention to the oil injection condition in the tank at any time, and therefore the process is further more convenient and reliable from another angle;
(4) the oil injection method can simultaneously inject oil into a plurality of transformers, and has the advantage of high working efficiency; and the whole oil injection process is controlled by the controller, the automation degree is high, the oil injection amount is independently controlled by each transformer, the manual operation procedure is reduced, the whole process is safer and more reliable, and the product quality is improved.
As optimization, the number of the oil storage tanks is two, namely an oil storage tank A filled with 25# transformer oil and an oil storage tank B filled with 45# transformer oil; during operation, the oil storage tank A or the oil storage tank B is selected to be filled with oil according to the transformer.
As optimization, the bottoms of the oil storage tank A and the oil storage tank B are respectively connected with an oil filling main pipe, and each oil filling main pipe is provided with an oil way master control electromagnetic valve; each transformer is connected with an oil injection branch pipe, and each oil injection branch pipe is provided with an oil way sub-control electromagnetic valve and a flowmeter; the oil injection main pipe is connected with the oil injection branch pipe through a multi-way pipe; when oil is injected, an oil path master control electromagnetic valve and an oil path branch control electromagnetic valve on a pipeline needing oil supply are both opened; and after all the oil path branch control electromagnetic valves are closed, the oil path master control electromagnetic valve is closed.
As optimization, the vacuum pipeline can be provided with a vacuum gauge A and a vacuum gauge B, and the vacuum gauge A and the vacuum gauge B are both connected with the controller; during oil injection, the A vacuum gauge detects the vacuum degree of the oil storage tank in real time, and the B vacuum gauge detects the vacuum degree of the vacuum tank in real time and transmits the vacuum degree to the controller. Preferably, the A vacuum gauge and the B vacuum gauge can adopt a thermal resistance vacuum gauge of TTR96 model.
Preferably, the flowmeter can be an elliptic gear flowmeter.
As an optimization, the controller is a programmable controller and comprises a touch screen; an operator sets the required vacuum degree and the oil injection amount of each transformer in the oil injection process through the touch screen, and during oil injection, the change of the vacuum degree and the oil injection amount is observed through the touch screen.
Preferably, the number of the transformers in the transformer vacuum quantitative oil filling method can be 8.
And as optimization, the oil injection amount of each transformer is selected according to 85% of the oil amount of the designed value. The oil filling amount can not be too full to prevent the oil from overflowing the transformer oil tank, but the oil amount is ensured to exceed all insulation parts of the transformer at the minimum.
The vacuum quantitative oil injection method for the transformer can be used for injecting oil into a distribution transformer, an amorphous alloy transformer or a small-capacity 35kV transformer.
Drawings
FIG. 1 is a schematic structural diagram of a vacuum quantitative oil injection system constructed for implementing the method of vacuum quantitative oil injection of a transformer according to the present invention;
FIG. 2 is a process flow diagram for oiling a transformer using the method of vacuum dosing oiling of the present invention;
FIG. 3 is a schematic diagram of an embodiment of a vacuum quantitative oil injection system configured to implement the method of vacuum quantitative oil injection for a transformer of the present invention;
FIG. 4 is a schematic diagram of the control of the oil system for achieving quantitative oil injection in the vacuum quantitative oil injection system of FIG. 3;
fig. 5 is a PLC circuit diagram of the vacuum dosing system of fig. 3.
The labels in the figures are: 1-oil storage tank, 101-A oil storage tank, 102-B oil storage tank; 2-an oil injection pipeline; 3-a transformer; 4-vacuum tank; 5-vacuum pipeline; 6-vacuumizing machine set; 7-oil path separate control electromagnetic valve; 8-a flow meter; 9-a pneumatic control valve; 10-oil path general control electromagnetic valve; 11-oil level gauge; 12-A vacuum gauge; 13-B vacuum gauge; 14-controller, 1401-touch screen.
Detailed Description
The invention is further illustrated by the following figures and examples, which are not to be construed as limiting the invention.
Referring to fig. 1, the method for vacuum quantitative oil injection of a transformer of the present invention comprises connecting an oil storage tank 1 filled with transformer oil with an oil injection pipeline 2 to an oil tank of at least one transformer 3 to form an oil path system; the transformer 3 is arranged inside the vacuum tank 4; the oil injection pipeline 2 is provided with an oil way sub-control electromagnetic valve 7 for controlling the oil injection amount of the transformer 3 and a flowmeter 8 for monitoring the oil injection amount of each transformer 3 corresponding to each transformer 3 respectively (namely, each transformer 3 is provided with an independent oil way sub-control electromagnetic valve 7 and an independent flowmeter 8, so that the oil injection amount of each transformer 3 can be independently controlled); the oil storage tank 1 and the vacuum tank 4 are respectively connected with a vacuumizing unit 6 through a vacuum pipeline 5 to form a vacuum system; the vacuum pipeline 5 is provided with air pressure control valves 9 corresponding to the oil storage tank 1 and the vacuum tank 4 respectively (namely, each oil storage tank 1 and each vacuum tank 4 are provided with an independent air pressure control valve 9); the vacuumizing unit 6, the oil way sub-control electromagnetic valve 7, the flowmeter 8 and the air pressure control valve 9 are all connected with a controller 13;
when oil is filled, the oil filling amount of each transformer 3 is set in the controller 13; starting a vacuumizing unit 6 to simultaneously vacuumize the oil storage tank 1 and the vacuum tank 4 to a full vacuum state; then, opening the oil way sub-control electromagnetic valve 7 to fill oil into the transformer 3, and meanwhile, the vacuumizing unit 6 is not stopped; when the oil injection amount of a certain transformer 3 reaches a set value, closing the oil path sub-control electromagnetic valves 7 corresponding to the transformer 3 until all the oil path sub-control electromagnetic valves 7 are closed; and finally, continuously vacuumizing and degassing to finish the oil injection process.
Referring to fig. 2, when the method for vacuum quantitative oil injection of a transformer of the present invention is used for vacuum oil injection, the operation steps may be as follows: filling filtered qualified transformer oil into an oil storage tank 1 (an oil level gauge 11 can be arranged on the oil storage tank 1 and used for observing the oil quantity height in the oil storage tank 1 and preventing the oil from being sucked into a vacuum system in the process of vacuumizing the oil storage tank 1 due to too much oil quantity); step two, pushing the transformer 3 into the vacuum tank 4, and connecting the oil pipe into the transformer 3; step three, setting the oil injection amount of each transformer 3 on the controller 14; step four, starting the vacuumizing unit 6, and vacuumizing the oil storage tank 1 and the vacuum tank 4 simultaneously; fifthly, vacuumizing and quantitatively injecting oil into the transformer 3; and step six, after oil injection of each transformer 3 is completed, vacuumizing and degassing.
As a specific example (see fig. 1-5):
(1) the number of the oil storage tanks 1 is two, and the two oil storage tanks are respectively an oil storage tank A101 filled with 25# transformer oil and an oil storage tank B102 filled with 45# transformer oil; in operation, the a tank 101 or the B tank 102 is selected for filling depending on the transformer.
(2) The bottoms of the oil storage tank A101 and the oil storage tank B102 are respectively connected with an oil filling main pipe 201, and each oil filling main pipe 201 is provided with an oil path master control electromagnetic valve 10 (the oil path master control electromagnetic valve 10 is connected with a controller 14); each transformer 3 is connected with an oil injection branch pipe 202, and each oil injection branch pipe 202 is provided with an oil way sub-control electromagnetic valve 7 and a flowmeter 8; the oil injection main pipe 201 is connected with the oil injection branch pipes 202 through multi-way pipes 203; during oil injection, an oil path master control electromagnetic valve 10 and an oil path branch control electromagnetic valve 7 on a pipeline needing oil supply are both opened; and after all the oil path branch control electromagnetic valves 7 are closed, the oil path master control electromagnetic valve 10 is closed.
(3) The vacuum pipeline 5 is provided with a vacuum gauge A12 and a vacuum gauge B13, and the vacuum gauge A12 and the vacuum gauge B13 are both connected with the controller 14; during oil injection, the A vacuum gauge 12 detects the vacuum degree of the oil storage tank 1 in real time, and the B vacuum gauge 13 detects the vacuum degree of the vacuum tank 4 in real time and transmits the vacuum degree to the controller 14. The vacuum gauge A12 and the vacuum gauge B13 are thermal resistance vacuum gauges of TTR96 type.
(4) The flow meter 8 is an oval gear flow meter. The elliptic gear flowmeter mainly comprises a shell, a counter, an elliptic gear and a coupling (comprising a magnetic coupling and an axial coupling); the device has the characteristics of simple and visual structure, small pressure loss, convenient maintenance, high measurement precision, small influence of liquid viscosity and the like. The elliptic gear flowmeter has the working principle that the elliptic gear flowmeter comprises a metering box, a pair of elliptic gears arranged in the metering box, an upper cover plate and a lower cover plate, wherein a sealed crescent-shaped cavity (which is not absolutely sealed due to the rotation of the gears) is formed as a calculation unit of primary displacement. When the measured liquid enters the flowmeter through the pipeline, the pressure difference generated at the inlet and the outlet pushes the pair of gears to continuously rotate, the liquid which is measured by the crescent-shaped cavity is continuously conveyed to the outlet, and the product of the revolution of the elliptic gear and four times of the displacement of each time is the total amount of the measured liquid flow. The principle of quantitative oil injection is as follows: the flowmeter 8 converts the corresponding pulse amount per liter of oil and sends the pulse amount to the controller 14, the controller 14 calculates the oil injection amount, and when the oil injection amount reaches a set value, the oil way branch control electromagnetic valve 7 is closed to realize quantitative oil injection.
(5) The controller 14 is a programmable controller, and the controller 14 includes a touch screen 1401; an operator sets the required vacuum degree and the oil injection amount of each transformer 3 through the touch screen 1401, and during oil injection, the change of the vacuum degree and the oil injection amount is observed through the touch screen 1401.
(6) The number of the transformers 3 is 8. I.e. 8 transformers 3 are simultaneously filled with oil.
(7) The oil injection amount of each transformer 3 is selected according to 85% of the oil amount of the designed value. The amount of oil injected should not be too great to prevent it from overflowing the tank of the transformer 3, but it should be guaranteed at a minimum that it exceeds all the insulation of the transformer 3.
The vacuum quantitative oil injection method of the transformer can be used for injecting oil into a distribution transformer, an amorphous alloy transformer or a small-capacity 35kV transformer.
When the vacuum quantitative oil injection method of the transformer is used for realizing vacuum quantitative oil injection, the following matters should be taken into consideration:
(1) oil injected into the transformer 3 needs to be filtered before oil injection, the oil temperature is controlled to be 50 +/-5 ℃, the oil temperature cannot be too high or too low, oil aging is easily caused when the oil temperature is too high, the oil filtering time is prolonged, and the penetration of an insulating part is influenced when the oil temperature is too low;
(2) before the transformer 3 is pushed into the vacuum tank 4, the vacuum tank 4 needs to be cleaned, especially, residual oil on the bottom and the wall of the vacuum tank 4 is easy to atomize in the vacuumizing process, so that an oil tank of the transformer 3 is polluted, and impurities in the vacuum tank 4 are also easy to be raised in the vacuumizing process and fall into the transformer 3.
The above general description of the invention and the description of the specific embodiments thereof, as referred to in this application, should not be construed as limiting the technical solutions of the invention. Those skilled in the art can add, reduce or combine the technical features disclosed in the general description and/or the specific embodiments (including the examples) to form other technical solutions within the protection scope of the present application according to the disclosure of the present application without departing from the structural elements of the present invention.
Claims (8)
1. The vacuum quantitative oil injection method of the transformer is characterized by comprising the following steps:
the method comprises the steps that an oil storage tank (1) filled with transformer oil is connected with an oil tank of at least one transformer (3) through an oil injection pipeline (2) to form an oil circuit system; the transformer (3) is arranged inside the vacuum tank (4); the oil injection pipeline (2) is provided with an oil way sub-control electromagnetic valve (7) for controlling the oil injection amount of each transformer (3) and a flowmeter (8) for monitoring the oil injection amount of each transformer (3) corresponding to each transformer (3); the oil storage tank (1) and the vacuum tank (4) are respectively connected with a vacuumizing unit (6) through a vacuum pipeline (5) to form a vacuum system; the vacuum pipeline (5) is provided with an air pressure control valve (9) corresponding to the oil storage tank (1) and the vacuum tank (4) respectively; the vacuumizing unit (6), the oil way sub-control electromagnetic valve (7), the flowmeter (8) and the air pressure control valve (9) are all connected with a controller (14);
when oil is filled, the oil filling amount of each transformer (3) is set in the controller (14); starting a vacuumizing unit (6) to simultaneously vacuumize the oil storage tank (1) and the vacuum tank (4) to a full vacuum state; then, opening an oil way sub-control electromagnetic valve (7) to fill oil into each transformer (3), and simultaneously, continuously pumping a vacuum unit (6); when the oil injection amount of a certain transformer (3) reaches a set value, closing the oil path sub-control electromagnetic valves (7) corresponding to the transformer (3) until all the oil path sub-control electromagnetic valves (7) are closed; finally, continuously vacuumizing and degassing to finish the oil injection process;
the number of the oil storage tanks (1) is two, and the oil storage tanks are respectively an oil storage tank A (101) filled with 25# transformer oil and an oil storage tank B (102) filled with 45# transformer oil; during operation, the oil storage tank A (101) or the oil storage tank B (102) is selected to be filled with oil according to the transformer;
the bottoms of the oil storage tank A (101) and the oil storage tank B (102) are respectively connected with an oil injection main pipe (201), and each oil injection main pipe (201) is provided with an oil way master control electromagnetic valve (10); each transformer (3) is connected with an oil injection branch pipe (202), and each oil injection branch pipe (202) is provided with an oil way sub-control electromagnetic valve (7) and a flowmeter (8); the oil injection main pipe (201) is connected with the oil injection branch pipe (202) through a multi-way pipe (203); when oil is injected, an oil path master control electromagnetic valve (10) and an oil path branch control electromagnetic valve (7) on a pipeline needing oil supply are both opened; and after all the oil path branch control electromagnetic valves (7) are closed, the oil path master control electromagnetic valve (10) is closed.
2. The method for vacuum quantitative oiling of transformers according to claim 1, characterized in that: the vacuum pipeline (5) is provided with a vacuum gauge A (12) and a vacuum gauge B (13), and the vacuum gauge A (12) and the vacuum gauge B (13) are both connected with the controller (14); during oil injection, the vacuum gauge A (12) detects the vacuum degree of the oil storage tank (1) in real time, and the vacuum gauge B (13) detects the vacuum degree of the vacuum tank (4) in real time and transmits the vacuum degree to the controller (14).
3. The method for vacuum quantitative oiling of transformers according to claim 2, characterized in that: the vacuum gauge A (12) and the vacuum gauge B (13) are thermal resistance vacuum gauges of TTR96 type.
4. The method for vacuum quantitative oiling of transformers according to claim 1, characterized in that: the flowmeter (8) is an elliptic gear flowmeter.
5. The method of vacuum dosing oil into a transformer according to any one of claims 1 to 4, wherein: the controller (14) is a programmable controller, and the controller (14) comprises a touch screen (1401); an operator sets the required vacuum degree and the oil injection amount of each transformer (3) through the touch screen (1401), and the change of the vacuum degree and the oil injection amount is observed through the touch screen (1401) during oil injection.
6. The method of vacuum dosing oil into a transformer according to any one of claims 1 to 4, wherein: the number of the transformers (3) is 8.
7. The method of vacuum dosing oil into a transformer according to any one of claims 1 to 4, wherein: the oil injection amount of each transformer (3) is selected according to 85% of the oil amount of the designed value.
8. The method of vacuum dosing oil into a transformer according to any one of claims 1 to 4, wherein: the method is used for injecting oil into a distribution transformer, an amorphous alloy transformer or a small-capacity 35kV transformer.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010127460.6A CN111312505B (en) | 2020-02-28 | 2020-02-28 | Vacuum quantitative oil injection method for transformer |
| PCT/CN2020/113890 WO2021169238A1 (en) | 2020-02-28 | 2020-09-08 | Vacuum quantitative oil injection method for transformer |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010127460.6A CN111312505B (en) | 2020-02-28 | 2020-02-28 | Vacuum quantitative oil injection method for transformer |
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| CN111312505B true CN111312505B (en) | 2021-07-27 |
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| CN111312505B (en) * | 2020-02-28 | 2021-07-27 | 三变科技股份有限公司 | Vacuum quantitative oil injection method for transformer |
| CN114267519B (en) * | 2021-11-11 | 2023-06-30 | 共信电力科技有限公司 | Oil-immersed power transformer based on negative pressure anti-overflow filling |
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- 2020-02-28 CN CN202010127460.6A patent/CN111312505B/en active Active
- 2020-09-08 WO PCT/CN2020/113890 patent/WO2021169238A1/en active Application Filing
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| Publication number | Publication date |
|---|---|
| CN111312505A (en) | 2020-06-19 |
| WO2021169238A1 (en) | 2021-09-02 |
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