CN112682815A - Novel arrangement method of air heater system - Google Patents
Novel arrangement method of air heater system Download PDFInfo
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- CN112682815A CN112682815A CN202110113553.8A CN202110113553A CN112682815A CN 112682815 A CN112682815 A CN 112682815A CN 202110113553 A CN202110113553 A CN 202110113553A CN 112682815 A CN112682815 A CN 112682815A
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- 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
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Abstract
The invention discloses a novel arrangement method of a fan heater system, which belongs to the technical field of fan heaters and comprises an air inlet pipe, wherein a fan heater body is arranged on one side of the inner wall of the air inlet pipe, a silencer is arranged on one side of the inner wall of the air inlet pipe close to the fan heater body, a main-path electric air damper is arranged on one side of the outer surface of the air inlet pipe close to the silencer, a bypass air pipe is arranged on one side of the outer surface of the air inlet pipe close to the main-path electric air damper, a bypass electric air damper is arranged on one side of the inner wall of the bypass air pipe, and one end of the air. The electric air damper for the main path of the air heater is simple and reasonable in structural design, and can be put into use under the condition that rapid cooling does not occur through the matched use of the main path electric air damper, the bypass air pipe and the bypass electric air damper, so that the stability of the air heater body in use can be ensured, and the phenomenon of equipment damage in the initial stage of the air heater body in use can be avoided.
Description
Technical Field
The invention relates to the technical field of air heaters, in particular to a novel air heater system arrangement method.
Background
The existing boiler plant for producing 600MW ultra-supercritical unit boilers adopts a fan heater to heat primary air and secondary air, and is used for improving the temperature of the primary air and the secondary air, preventing low-temperature corrosion of an air preheater and the like, each boiler is respectively provided with two primary air and secondary air fan heaters, heat exchange tubes of the fan heaters are spiral finned tubes and are horizontally arranged, the fan heaters are arranged in front and back of a fan inlet air duct in two groups, heating media of the fan heaters are boiler low-pressure auxiliary steam supply, the temperature is 240 ℃, the pressure is 0.6MPa, the steam is fed into a fan heater body through a steam supply manual door, a steam supply adjusting door and related pipelines, a flange is designed on a drain pipe close to the fan heater body, the flange is untied when the fan heaters are isolated, water stored in the fan heater body is completely, an automatic steam trap and a bypass manual door are designed on the drain pipeline, and steam cooling, condensing and accumulated water in a pipe bundle of the fan heater is automatically discharged into a fan trap tank, finally, pumping accumulated water into a boiler drainage flash tank or a steam turbine condenser for drainage recovery through two multi-stage drainage pumps (one pump and one standby) in a pit at the lower part of the drainage tank;
however, the air heater system has the following defects that the ventilation volume of the air feeder is large, the output design of the air heater is designed according to the maximum load of the boiler and the lowest temperature of the outside air, and more than 20 percent of margin is left, but in the actual operation, the working condition that the maximum load of the air heater occurs is few;
the air heater initial stage of commissioning, forced draught blower air volume and wind speed are all great, air heater heat transfer area is also great, nevertheless slowly open the steam supply valve and adjust the steam supply for avoiding air heater initial stage pipeline and equipment vibrations on the contrary, this steam volume that leads to letting in the air heater body is less but the water that condenses into soon, when the ambient wind temperature is less than subzero or lower, probably lead to the inside ponding of air heater tube bank and slowly freeze, lead to the heat transfer effect poor, hydrophobic not smooth and equipment abnormal sound vibrations problem, in case the leakage appears in the heat exchanger tube bank, the ponding of leakage or ice-cube will be along with the inside fan blade that causes of wind channel entering fan damages.
Disclosure of Invention
Therefore, the embodiment of the invention provides a novel arrangement method of a fan heater system, which aims to solve the problems that in the prior art, in the initial operation stage of a fan heater, the ventilation volume and the air speed of a fan are both large, the heat exchange area of the fan heater is also large, but in order to avoid the vibration of a pipeline and equipment in the initial operation stage of the fan heater, a steam supply regulating valve is gradually and slowly opened to adjust the steam supply volume, the steam quantity introduced into a fan heater body is small but water is quickly condensed, when the ambient air temperature is lower than zero or lower, water is accumulated in a pipe bundle of the fan heater and slowly freezes, the heat exchange effect is poor, the drainage is not smooth, the equipment is abnormal in sound vibration, and once the heat exchange pipe bundle leaks, the leaked water or ice blocks enter the fan along with an air channel to cause the damage of fan blades.
In order to achieve the above object, the embodiments of the present invention provide the following technical solutions: a novel arrangement method of a fan heater system comprises an air inlet pipe, a fan heater body is installed on one side of the inner wall of the air inlet pipe, the input end of the fan heater body is electrically connected with the output end of an external power supply, a silencer is installed on one side of the inner wall of the air inlet pipe close to the fan heater body, a main circuit electric air damper is installed on one side of the outer surface of the air inlet pipe close to the silencer, the input end of the main circuit electric air damper is electrically connected with the output end of the external power supply, a bypass air pipe is installed on one side of the outer surface of the air inlet pipe close to the main circuit electric air damper, a bypass electric air damper is installed on one side of the inner wall of the bypass air pipe, the input end of the bypass electric air damper is electrically connected with the output end of the external power supply, a fan is connected with one end of the air inlet, the utility model discloses an air supply pipe, including blast pipe, electric valve, external power source, blast pipe one end is connected with the pre-heater, first electric valve is installed to blast pipe surface one side, first electric valve's input and external power source's output electric connection, second electric valve is installed to blast pipe surface opposite side, second electric valve's input and external power source's output electric connection, blast pipe surface mid-mounting has the connecting pipe.
Furthermore, the number of the air inlet pipe, the air feeder, the air supply pipes and the preheater is two, and the two air supply pipes are connected through a connecting pipe.
Further, the number of the first electric valves and the number of the second electric valves are both two.
Furthermore, the air heater body comprises four small-size air heaters, and each small-size air heater all is provided with independent steam supply door, drain door and compressed air and sweeps the pipeline.
Further, the drain pipe is installed to fan heater body bottom one side, drain pipe one end is connected with the drain tank, the drain tank top is provided with the inlet tube, first pipe is installed to drain tank bottom, the level gauge is all installed to drain tank surface both sides, the governing valve is installed to first pipe surface one side, first pipe surface one side is close to governing valve department and installs the dredging pipe, bypass electric valve is installed to dredging pipe surface one side, bypass electric valve's input and external power source's output electric connection, first pipe one end is connected with the branch pipe, it is connected with the sampling tube to divide pipe one end, it has the condenser to divide pipe surface one side through pipe connection, it has hydrophobic flash chamber through pipe connection to divide pipe surface opposite side.
Further, a second guide pipe is installed on the other side of the bottom of the air heater body, one end of the second guide pipe is connected with a discharge guide pipe, one end of the discharge guide pipe is connected with a steam turbine steam generator, and the other end of the discharge guide pipe is connected with a drainage guide pipe.
Furthermore, a first stop valve is arranged on one side of the outer surface of the drain pipe and one side of the outer surface of the second conduit.
Furthermore, the number of the drain pipes and the number of the second guide pipes are four, one end of each drain pipe is connected with a water collecting pipe, one end of each water collecting pipe is connected with a water inlet pipe, one end of each second guide pipe is connected with a water collecting pipe, and one end of each water collecting pipe is connected with a discharge guide pipe.
Furthermore, a second stop valve is arranged between the condenser and the branch guide pipe, between the drainage flash tank and the branch guide pipe and in the middle of the outer surface of the sampling pipe.
Furthermore, a third stop valve is arranged on one side of the outer surface of the discharge conduit and one side of the outer surface of the hydrophobic conduit.
The embodiment of the invention has the following advantages:
1. through the cooperation use of the electronic air damper of main road, bypass tuber pipe and the electronic air damper of bypass, can make the phenomenon that the fan heater body dropped into use appear under the condition that does not appear the rapid cooling, stability when can guaranteeing the fan heater body and use avoids the phenomenon that equipment damage appears in the fan heater body input initial stage.
2. Through adjusting the work quantity of four inside air heaters of air heater body, can adjust the operational load of air heater system, avoided air heater body to drop into the too big hydrophobic temperature problem of crossing that causes of heat radiating area, can reduce the maintenance degree of difficulty of air heater body simultaneously, the use of the air heater body of being convenient for.
3. Through the use of drain pipe and second pipe, can independently discharge the comdenstion water that produces when the time runs to the warm-air blower body of once-wind and the comdenstion water that produces when the time runs to the warm-air blower body of overgrate air, avoid the phenomenon of steam lock to appear in the drain pipe, the staff of being convenient for is handled the collection of comdenstion water.
4. Through the use of the drain pipe and the bypass electric valve, the smoothness of the drain pipe can be ensured, the stability of the drain pipe during use is improved, the drainage of the primary air heater body is facilitated, the smoothness of the drain pipe can be ensured through the use of the drain pipe, and the drainage of the secondary air heater body is facilitated.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present invention can be implemented, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the effects and the achievable by the present invention, should still fall within the range that the technical contents disclosed in the present invention can cover.
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the mounting structure of the muffler of the present invention;
FIG. 3 is a schematic view of a steam supply and drainage system according to the present invention;
FIG. 4 is a front view of the air heater of the present invention;
FIG. 5 is a side view of the air heater of the present invention;
FIG. 6 is a top view of the present invention;
FIG. 7 is a schematic view of the construction of a trap according to the present invention;
in the figure: 1. an air inlet pipe; 2. a heater body; 3. a muffler; 4. a main road electric air damper; 5. a bypass air duct; 6. a bypass electric damper; 7. a blower; 8. an air supply pipe; 9. a preheater; 10. a first electrically operated valve; 11. a second electrically operated valve; 12. a connecting pipe; 13. a drain pipe; 14. a drain tank; 15. a water inlet pipe; 16. a first conduit; 17. a liquid level meter; 18. a second conduit; 19. a discharge conduit; 20. a steam engine steamer; 21. a hydrophobic conduit; 22. adjusting a valve; 23. a branch conduit; 24. a sampling tube; 25. a condenser; 26. a hydrophobic flash tank; 27. a dredging pipe; 28. bypassing the electrically operated valve.
Detailed Description
The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to the accompanying drawings 1-7 in the specification, a novel arrangement method of a fan heater system comprises an air inlet pipe 1, a fan heater body 2 is arranged on one side of the inner wall of the air inlet pipe 1, the input end of the fan heater body 2 is electrically connected with the output end of an external power supply, a silencer 3 is arranged on one side of the inner wall of the air inlet pipe 1 close to the fan heater body 2, a main electronic air damper 4 is arranged on one side of the outer surface of the air inlet pipe 1 close to the silencer 3, the input end of the main electronic air damper 4 is electrically connected with the output end of the external power supply, a bypass air pipe 5 is arranged on one side of the outer surface of the air inlet pipe 1 close to the main electronic air damper 4, a bypass electronic air damper 6 is arranged on one side of the inner wall of the bypass air pipe 5, the input end of the bypass electronic air damper 6 is electrically connected with the output end of the external, 7 air outlets of air feeder are provided with an air supply pipe 8, one end of the air supply pipe 8 is connected with a preheater 9, one side of the outer surface of the air supply pipe 8 is provided with a first electric valve 10, the input end of the first electric valve 10 is electrically connected with the output end of an external power supply, the other side of the outer surface of the air supply pipe 8 is provided with a second electric valve 11, the input end of the second electric valve 11 is electrically connected with the output end of the external power supply, and the middle part of the outer surface of the air supply pipe.
The number of the air inlet pipe 1, the number of the air feeder 7, the number of the air supply pipes 8 and the number of the preheaters 9 are two, the two air supply pipes 8 are connected through the connecting pipe 12, and the two groups of air heater running devices are arranged, so that the normal running of an air heater system can be ensured, and the stability of the air heater system in running can be improved;
the quantity of first electric valve 10 and second electric valve 11 is two, uses through the cooperation of two first electric valve 10 and second electric valve 11, can realize that a single fan heater body 2 carries out the heat supply to two pre-heaters 9, and the operation of the fan heater system of being convenient for is used.
The air heater body 2 comprises four small-size air heaters, and every small-size air heater all is provided with independent steam supply door, drain door and compressed air and sweeps the pipeline, can drop into the air heater by the maintainer cooperation according to load needs group during the operation, and has avoided big group's air heater to drop into heat radiating area and too big hydrophobic temperature problem of causing excessively low.
The other side of the bottom of the air heater body 2 is provided with a second conduit 18, one end of the second conduit 18 is connected with a discharge conduit 19, one end of the discharge conduit 19 is connected with a steam engine steam device 20, and the other end of the discharge conduit 19 is connected with a drainage conduit 21.
The first stop valve is installed on one side of the outer surface of the drain pipe 13 and one side of the outer surface of the second guide pipe 18, so that a worker can drain water to the air heater body 2 conveniently, and the phenomenon of air blockage is avoided.
The quantity of drain pipe 13 and the quantity of second pipe 18 are four, and four drain pipe 13 one ends are connected with the collector pipe, and collector pipe one end is connected with inlet tube 15, and four second pipe 18 one ends are connected with the catchment pipe, and catchment pipe one end is connected with exhaust pipe 19, the staff of being convenient for to the use of fan heater body 2.
The condenser 25 and divide between the pipe 23, between drainage flash tank 26 and the branch pipe 23 and sampling tube 24 surface middle part all install the second stop valve, can let the staff detect drainage quality of water, and unqualified drainage quality of water enters into inside drainage flash tank 26, and qualified drainage quality of water enters into inside condenser 25, retrieves to reach the purpose of water conservation.
And third stop valves are respectively arranged on one side of the outer surface of the discharge conduit 19 and one side of the outer surface of the drainage conduit 21, so that the steam generator steam device 20 can conveniently recover the water vapor.
Because the number of the air heater bodies 2 is two, when the primary air heater body 2 runs, condensed water enters the interior of the drain pipe 13, reaches the interior of the drain tank 14 through the drain pipe 13, reaches the regulating valve 22 through the drain tank 14, when the interior of the drain pipe 13 is blocked, the drain pipe 13 can be drained by starting the bypass electric valve 28, the condensed water reaches the branch conduit 23 through the drain pipe 13, a worker samples and detects the condensed water from the sampling pipe 24, when the quality of the condensed water is unqualified, the quality of the condensed water enters the interior of the drain flash tank 26, and when the quality of the condensed water is qualified, the quality of the condensed water enters the interior of the condenser 25;
when the secondary air heater body 2 is operated, the condensed water enters the second conduit 18 and reaches the discharge conduit 19 from the second conduit 18, a part of the condensed water enters the steam turbine steam generator 20, and the other part of the condensed water enters the drain conduit 21 and is discharged.
The application process of the embodiment of the invention is as follows: the working personnel starts the air feeder 7, at the initial stage of the wind heater body 2, the working personnel starts the main-path electric air damper 4 to shield the wind heater body 2, simultaneously starts the bypass electric air damper 6 to open the bypass electric air damper 6, then starts the wind heater body 2 to preheat, when the wind heater body 2 operates stably, the working personnel restarts the main-path electric air damper 4 and the bypass electric air damper 6 to open the main-path electric air damper 4 and close the bypass electric air damper 6, hot air generated by the wind heater body 2 reaches the air supply pipe 8 through the air feeder 7 and is discharged from the preheater 9, and the phenomenon of putting into use can occur under the condition that the wind heater body 2 is not subjected to rapid cooling through the matching use of the main-path electric air damper 4, the air pipe bypass 5 and the bypass electric air damper 6, the stability of the air heater body 2 in use can be ensured, and the phenomenon of equipment damage in the initial stage of the air heater body 2 is avoided;
by adjusting the working quantity of the four air heaters in the air heater body 2, the operation load of an air heater system can be adjusted, the problem that the drain temperature is too low due to the fact that the heat radiation area of the air heater body 2 is too large is solved, meanwhile, the overhauling difficulty of the air heater body 2 can be reduced, and the air heater body 2 can be conveniently used;
because the number of the air heater bodies 2 is two, when the primary air heater body 2 runs, condensed water enters the interior of the drain pipe 13, reaches the interior of the drain tank 14 through the drain pipe 13, reaches the regulating valve 22 through the drain tank 14, when the interior of the drain pipe 13 is blocked, the drain pipe 13 can be drained by starting the bypass electric valve 28, the stability of the equipment during running is improved, the condensed water reaches the branch conduit 23 through the drain pipe 13, a worker samples and detects the condensed water from the sampling pipe 24, when the quality of the drained water is unqualified, the quality of the drained water enters the interior of the drain flash tank 26, and when the quality of the drained water is qualified, the quality of the drained water enters the interior of the condenser 25 and is recovered, so that the purpose of saving water is achieved;
when the secondary air heater body 2 operates, condensed water enters the second conduit 18 and reaches the discharge conduit 19 from the second conduit 18, a part of the condensed water enters the steam turbine steam generator 20, and the other part of the condensed water enters the drainage conduit 21 for discharge;
through the use of drain pipe 13 and second pipe 18, can independently discharge the comdenstion water that produces when the time runs to the air heater body 2 of a wind and the comdenstion water that produces when the time runs to the air heater body 2 of overgrate air, avoid drain pipe 13 the phenomenon of vapour lock to appear, the staff of being convenient for is handled the collection of comdenstion water.
Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
In the present specification, the terms "upper", "lower", "left", "right", "middle", and the like are used for clarity of description, and are not intended to limit the scope of the present invention, and changes or modifications in the relative relationship may be made without substantial changes in the technical content.
Claims (10)
1. A novel arrangement method of a fan heater system comprises an air inlet pipe (1), and is characterized in that: the air heater is characterized in that a heater body (2) is installed on one side of the inner wall of an air inlet pipe (1), the input end of the heater body (2) is electrically connected with the output end of an external power supply, a silencer (3) is installed on one side of the inner wall of the air inlet pipe (1) close to the heater body (2), a main electric air damper (4) is installed on one side of the outer surface of the air inlet pipe (1) close to the silencer (3), the input end of the main electric air damper (4) is electrically connected with the output end of the external power supply, a bypass air pipe (5) is installed on one side of the outer surface of the air inlet pipe (1) close to the main electric air damper (4), a bypass electric air damper (6) is installed on one side of the inner wall of the bypass air pipe (5), the input end of the bypass electric air damper (6) is electrically connected with the output end of the external, the utility model discloses a forced draught blower, including forced draught blower (7), blast pipe (8) are installed to forced draught blower (7) air outlet, blast pipe (8) one end is connected with pre-heater (9), first electric valve (10) are installed to blast pipe (8) surface one side, the input of first electric valve (10) and external power source's output electric connection, second electric valve (11) are installed to blast pipe (8) surface opposite side, the input of second electric valve (11) and external power source's output electric connection, blast pipe (8) surface mid-mounting has connecting pipe (12).
2. The arrangement method of the novel air heater system as claimed in claim 1, wherein: the air inlet pipe (1), the air feeder (7), the air supply pipes (8) and the preheater (9) are respectively two in number, and the two air supply pipes (8) are connected through a connecting pipe (12).
3. The arrangement method of the novel air heater system as claimed in claim 2, wherein: the number of the first electric valves (10) and the number of the second electric valves (11) are two.
4. The arrangement method of the novel air heater system as claimed in claim 1, wherein: the air heater body (2) is composed of four small air heaters, and each small air heater is provided with an independent steam supply valve, a drainage valve and a compressed air purging pipeline.
5. The arrangement method of the novel air heater system as claimed in claim 1, wherein: the air heater is characterized in that a drain pipe (13) is installed on one side of the bottom of the air heater body (2), one end of the drain pipe (13) is connected with a drain tank (14), a water inlet pipe (15) is arranged at the top of the drain tank (14), a first guide pipe (16) is installed at the bottom of the drain tank (14), liquid level meters (17) are installed on two sides of the outer surface of the drain tank (14), a regulating valve (22) is installed on one side of the outer surface of the first guide pipe (16), a drain pipe (27) is installed on one side of the outer surface of the first guide pipe (16) close to the regulating valve (22), a bypass electric valve (28) is installed on one side of the outer surface of the drain pipe (27), the input end of the bypass electric valve (28) is electrically connected with the output end of an external power supply, one end of the first guide pipe, one side of the outer surface of the branch conduit (23) is connected with a condenser (25) through a conduit, and the other side of the outer surface of the branch conduit (23) is connected with a hydrophobic expansion tank (26) through a conduit.
6. The arrangement method of the novel air heater system as claimed in claim 1, wherein: the air heater is characterized in that a second guide pipe (18) is installed on the other side of the bottom of the air heater body (2), one end of the second guide pipe (18) is connected with a discharge guide pipe (19), one end of the discharge guide pipe (19) is connected with a steam turbine steam generator (20), and the other end of the discharge guide pipe (19) is connected with a drainage guide pipe (21).
7. The arrangement method of the novel air heater system as claimed in claim 5, wherein: and a first stop valve is arranged on one side of the outer surface of the drain pipe (13) and one side of the outer surface of the second conduit (18).
8. The arrangement method of the novel air heater system as claimed in claim 5, wherein: the quantity of drain pipe (13) and the quantity of second pipe (18) are four, four drain pipe (13) one end is connected with the collector pipe, and collector pipe one end is connected with inlet tube (15), four second pipe (18) one end is connected with the catchment pipe, and catchment pipe one end is connected with exhaust pipe (19).
9. The arrangement method of the novel air heater system as claimed in claim 5, wherein: and second stop valves are respectively arranged between the condenser (25) and the branch guide pipe (23), between the drainage flash tank (26) and the branch guide pipe (23) and in the middle of the outer surface of the sampling pipe (24).
10. The arrangement method of the novel air heater system as claimed in claim 6, wherein: and third stop valves are respectively arranged on one side of the outer surface of the discharge conduit (19) and one side of the outer surface of the drainage conduit (21).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110113553.8A CN112682815A (en) | 2021-01-27 | 2021-01-27 | Novel arrangement method of air heater system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110113553.8A CN112682815A (en) | 2021-01-27 | 2021-01-27 | Novel arrangement method of air heater system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112682815A true CN112682815A (en) | 2021-04-20 |
Family
ID=75459357
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110113553.8A Pending CN112682815A (en) | 2021-01-27 | 2021-01-27 | Novel arrangement method of air heater system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112682815A (en) |
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2021
- 2021-01-27 CN CN202110113553.8A patent/CN112682815A/en active Pending
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