CN110131718B - Micro-power oxygen-enriching device - Google Patents
Micro-power oxygen-enriching device Download PDFInfo
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- CN110131718B CN110131718B CN201910519391.0A CN201910519391A CN110131718B CN 110131718 B CN110131718 B CN 110131718B CN 201910519391 A CN201910519391 A CN 201910519391A CN 110131718 B CN110131718 B CN 110131718B
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- Prior art keywords
- oxygen
- air
- connecting plate
- nitrogen separation
- pipe
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- 238000000926 separation method Methods 0.000 claims abstract description 45
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 44
- 239000001301 oxygen Substances 0.000 claims abstract description 44
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 44
- OLBVUFHMDRJKTK-UHFFFAOYSA-N [N].[O] Chemical compound [N].[O] OLBVUFHMDRJKTK-UHFFFAOYSA-N 0.000 claims abstract description 43
- 239000007789 gas Substances 0.000 claims abstract description 32
- 238000007789 sealing Methods 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 4
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 23
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 12
- 238000000197 pyrolysis Methods 0.000 abstract description 12
- 238000000034 method Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- 238000004227 thermal cracking Methods 0.000 description 3
- HGUFODBRKLSHSI-UHFFFAOYSA-N 2,3,7,8-tetrachloro-dibenzo-p-dioxin Chemical compound O1C2=CC(Cl)=C(Cl)C=C2OC2=C1C=C(Cl)C(Cl)=C2 HGUFODBRKLSHSI-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- -1 nitrogen ions Chemical class 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B13/00—Oxygen; Ozone; Oxides or hydroxides in general
- C01B13/02—Preparation of oxygen
- C01B13/0229—Purification or separation processes
- C01B13/0248—Physical processing only
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/02—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment
- F23G5/027—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment pyrolising or gasifying stage
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L17/00—Inducing draught; Tops for chimneys or ventilating shafts; Terminals for flues
- F23L17/005—Inducing draught; Tops for chimneys or ventilating shafts; Terminals for flues using fans
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L5/00—Blast-producing apparatus before the fire
- F23L5/02—Arrangements of fans or blowers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L7/00—Supplying non-combustible liquids or gases, other than air, to the fire, e.g. oxygen, steam
- F23L7/007—Supplying oxygen or oxygen-enriched air
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Organic Chemistry (AREA)
- Analytical Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Physical Or Chemical Processes And Apparatus (AREA)
Abstract
The invention relates to a micro-power oxygen-enriching device, belonging to the technical field of garbage treatment; the technical problems to be solved are as follows: the micro-power oxygen-enriching device is provided, on the premise of saving the running cost, the oxygen content of the air inlet in the air distribution system is improved, and the temperature of garbage pyrolysis is improved in an oxygen-enriched environment, so that the garbage treatment efficiency is improved; the technical scheme adopted is as follows: the micro-power oxygen-enriched device comprises a gas collection cover and a plurality of oxygen-nitrogen separation units which are sequentially connected in series, wherein the oxygen-nitrogen separation units send air into an air guide pipe through a guide fan and an air supply pipe, a high-strength magnetic rod in the air guide pipe generates a magnetic field, the difference of magnetic susceptibility of nitrogen and oxygen is utilized to lead the air to realize layering in the air guide pipe, the air is separated by an oxygen-nitrogen separation baffle pipe when flowing through the rear end, nitrogen-enriched air is discharged out of the air guide pipe, the oxygen-enriched air enters the next oxygen-nitrogen separation unit to further improve the oxygen purity or directly enters the gas collection cover to be used, and the gas collection cover is a conical cover body.
Description
Technical Field
The invention relates to a micro-power oxygen-enriched device, which belongs to the technical field of garbage treatment, in particular to an improvement of oxygen content in a low-temperature pyrolysis gas distribution system.
Background
In the low-temperature pyrolysis process of the garbage, the household garbage is pyrolyzed by depending on the self heat value in the pyrolysis process, and the temperature can only reach below 200 ℃, so that the effect on the garbage treatment efficiency is great. The existing household garbage treatment process generally needs to add auxiliary fuel or perform early garbage sorting to maintain the normal operation of garbage treatment equipment, and therefore the overall operation cost is too high. Through experiments for many years, the optimal thermal cracking temperature of the domestic garbage after carbonization is found to be 300-380 ℃, the generation amount of dioxin at the temperature is very small, and the treatment efficiency is high. The best method for raising the thermal cracking temperature of the garbage is to make the garbage in an oxygen-enriched environment. It is therefore desirable to develop a low temperature pyrolysis gas distribution system that increases the oxygen content of the intake gases.
Disclosure of Invention
The invention overcomes the defects existing in the prior art, and solves the technical problems that: the micro-power oxygen-enriched device is provided, on the premise of saving the running cost, the oxygen content of the air inlet in the air distribution system is improved, and the temperature of garbage pyrolysis is improved in an oxygen-enriched environment, so that the garbage treatment efficiency is improved.
In order to solve the technical problems, the invention adopts the following technical scheme: the micro-power oxygen enrichment device comprises a gas collection cover and a plurality of oxygen-nitrogen separation units which are sequentially connected in series;
the oxygen-nitrogen separation unit comprises air ducts, a front connecting plate, a rear connecting plate, high-strength magnetic rods, a fixed groove, an induced fan, an air supply pipe and an oxygen-nitrogen separation baffle pipe, wherein the air ducts are of hollow tubular structures, two ends of each air duct are respectively and hermetically fixed on the front connecting plate and the rear connecting plate, the center of each air duct is fixedly provided with one high-strength magnetic rod, the rear section of each high-strength magnetic rod is sleeved with the oxygen-nitrogen separation baffle pipe and the oxygen-nitrogen separation baffle pipe is fixed on the rear connecting plate, the positions of the front connecting plate, corresponding to the gaps between the high-strength magnetic rods and the inner walls of the air ducts, of the rear connecting plate, corresponding to the gaps between the high-strength magnetic rods and the inner walls of the oxygen-nitrogen separation baffle pipes, are provided with a plurality of oxygen-enriched air outlets which are communicated with the outside, a plurality of induced fans are arranged in the fixed groove, the positions, corresponding to the induced fans, of the fixed groove are fixedly connected with the front connecting plate through a plurality of air supply pipes, and each air supply pipe is correspondingly communicated with the air inlets on the front connecting plate;
the gas collecting cover is a conical cover body, a flange hole is arranged at the edge of the open end of the gas collecting cover, and an oxygen-enriched air supply pipe is arranged at the necking end of the gas collecting cover;
the rear connecting plate and the fixing groove are respectively provided with a flange hole, the adjacent oxygen-nitrogen separation units are connected with the flange holes on the rear connecting plate and the fixing groove in a matched manner through bolts to realize sealing series connection, and the oxygen-nitrogen separation unit at the rearmost end is matched with the gas collecting cover through bolts to realize sealing connection with the flange holes.
Stainless steel fine coiled wires are fully adhered to the surface of the high-strength magnetic rod.
The high-strength magnetic bar is a Ru-Fe-B high-strength magnetic bar.
The magnetic field intensity of the high-strength magnetic rod is 10000-15000 gauss.
And a speed regulator is arranged on the induced fan.
The air duct, the front connecting plate, the rear connecting plate, the fixed groove, the air supply pipe and the oxygen-nitrogen separation baffle pipe are all made of PVC materials.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, a plurality of oxygen-nitrogen separation units are used in series, air is sent into the air duct through the induced fan and the air supply pipe, a magnetic field is generated by the high-strength magnetic rod in the air duct, the air is layered in the air duct due to the magnetic susceptibility difference of nitrogen and oxygen, the air is separated by the oxygen-nitrogen separation baffle pipe when flowing through the rear end, nitrogen-enriched air is discharged out of the air duct, and the oxygen-enriched air enters the next oxygen-nitrogen separation unit to further improve the oxygen purity or directly enter the gas collection cover for preparation, so that the oxygen content in the supplied air is effectively improved on the premise of saving the running cost, the garbage pyrolysis is in an oxygen-enriched environment, the pyrolysis temperature is improved, and the garbage pyrolysis efficiency is further improved.
Drawings
The invention is described in further detail below with reference to the accompanying drawings;
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a left side view of FIG. 1;
FIG. 3 is a right side view of FIG. 1;
in the figure: 1 is an oxygen-nitrogen separation unit, 2 is a gas collection cover, 11 is a gas guide pipe, 12 is a front connecting plate, 13 is a rear connecting plate, 14 is a high-strength magnetic rod, 15 is a fixed groove, 16 is a induced air fan, 17 is an induced air port, 18 is a blast pipe, and 19 is an oxygen-nitrogen separation baffle pipe.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments; all other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1-3, the micro-power oxygen enrichment device comprises a gas collection cover 2 and a plurality of oxygen-nitrogen separation units 1 which are sequentially connected in series;
the oxygen-nitrogen separation unit comprises an air duct 11, a front connecting plate 12, a rear connecting plate 13, high-strength magnetic rods 14, a fixed slot 15, an induced fan 16, an air supply pipe 18 and an oxygen-nitrogen separation baffle pipe 19, wherein the air ducts 11 are of hollow tubular structures, two ends of the air duct 11 are respectively and hermetically fixed on the front connecting plate 12 and the rear connecting plate 13, the center of each air duct 11 is fixedly provided with one high-strength magnetic rod 14, the rear section of each high-strength magnetic rod 14 is sleeved with the oxygen-nitrogen separation baffle pipe 19, the oxygen-nitrogen separation baffle pipe 19 is fixed on the rear connecting plate 13, the front connecting plate 12 is provided with a plurality of air inlets corresponding to the gaps between the high-strength magnetic rods 14 and the inner walls of the air ducts 11, the rear connecting plate 13 is provided with a plurality of oxygen-enriched air outlets corresponding to the gaps between the high-strength magnetic rods 14 and the oxygen-nitrogen separation baffle pipe 19, the rear end of the air duct 11 is provided with a plurality of nitrogen-enriched air outlets which are communicated with the outside, the fixed slot 15 is internally provided with a plurality of induced fans 16, the fixed slot 15 is provided with an air inlet 17 corresponding to the position of the induced fans 16, and the fixed slot 15 is connected with the front connecting plate 12 and the air supply pipe 17 through the plurality of air inlets 18 corresponding to the front connecting plate 12 and the air supply pipe 17;
the gas collecting cover 2 is a conical cover body, a flange hole is arranged at the edge of the open end of the gas collecting cover 2, and an oxygen-enriched air supply pipe is arranged at the necking end of the gas collecting cover 2;
the rear connecting plate 13 and the fixed groove 15 are respectively provided with a flange hole, the adjacent oxygen-nitrogen separation units 1 are connected with the flange holes on the rear connecting plate 13 and the fixed groove 15 in a matched manner through bolts to realize sealing series connection, and the oxygen-nitrogen separation unit 1 positioned at the rearmost end is matched with the gas collecting cover 2 through bolts to realize sealing connection.
The working process of the oxygen-nitrogen separation unit 1 comprises the following steps: air is sent into the air guide pipe 11 through the air guide fan 16 and the air supply pipe 18, a magnetic field is generated by the high-strength magnetic rod 14 in the air guide pipe 11, the air is layered in the air guide pipe 11 by utilizing the difference of the magnetic susceptibility of nitrogen and oxygen, the air is separated by the oxygen and nitrogen separation baffle pipe 19 when flowing through the rear end, nitrogen-enriched air is discharged out of the air guide pipe through the nitrogen-enriched air outlet, and the oxygen-enriched air enters the next oxygen and nitrogen separation unit 1 through the oxygen-enriched air outlet to further improve the oxygen purity or directly enters the gas collection cover 2 to be ready for use.
According to the invention, the plurality of oxygen-nitrogen separation units 1 are operated in series, so that the oxygen concentration of the supply gas is increased gradually, the oxygen concentration of the supply gas entering the thermal cracking furnace is increased to more than 28%, the garbage pyrolysis is in an oxygen-enriched environment on the premise of saving the operation cost, the pyrolysis temperature is increased, and the garbage pyrolysis efficiency is further improved.
As shown in fig. 1, in an implementation structure of the invention, two oxygen-nitrogen separation units 1 are connected in series to realize two-stage purification of oxygen, and purified supply gas enters a gas collection cover 2; the length of the high-strength magnetic rod 14 is 380mm, the diameter of the air duct 11 is 90mm, the diameter of the oxygen-nitrogen separation baffle tube 19 is 50mm, the diameter of the air inlet 17 is 12mm, the diameter of the nitrogen-enriched air outlet is 12mm, the diameter of the oxygen-enriched air outlet is 10mm, and the 9 air ducts 11 are connected in parallel to form an oxygen-nitrogen separation unit.
Stainless steel fine coiled wires are fully adhered to the surface of the high-strength magnetic rod 14, so that the contact surface of a magnetic field and gas is increased, and the oxygen-nitrogen separation efficiency is improved.
The high-strength magnetic rod 14 is a Ru-Fe-B high-strength magnetic rod.
The magnetic field strength of the high-strength magnetic rod 14 is 10000-15000 gauss.
The induced fan 16 is provided with a speed regulator, the induced fan 16 pushes gas to flow, the speed regulator controls the rotating speed of the induced fan 16, and the change of the gas flow speed is realized, so that the adjustment of the optimal oxygen concentration is realized.
The air duct 11, the front connecting plate 12, the rear connecting plate 13, the fixing groove 15, the air supply pipe 18 and the oxygen-nitrogen separation baffle pipe 19 are all made of PVC materials. The parts are made of non-magnetic PVC materials, so that disorder of oxygen and nitrogen ions caused by disorder of an internal magnetic field can be avoided. All the components can be made of non-magnetic materials, but PVC is selected here because the processing is simple and the strength is high.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (4)
1. The micro-power oxygen enrichment device is characterized in that: comprises a gas collecting cover (2) and a plurality of oxygen-nitrogen separation units (1) which are sequentially connected in series;
the oxygen-nitrogen separation unit comprises an air guide pipe (11), a front connecting plate (12), a rear connecting plate (13), high-strength magnetic rods (14), a fixed slot (15), an induced air fan (16), an air supply pipe (18) and an oxygen-nitrogen separation baffle pipe (19), wherein the air guide pipes (11) are of hollow tubular structures, two ends of each air guide pipe are respectively fixed on the front connecting plate (12) and the rear connecting plate (13) in a sealing manner, the center of each air guide pipe (11) is fixedly provided with one high-strength magnetic rod (14), the rear section of each high-strength magnetic rod (14) is sleeved with the oxygen-nitrogen separation baffle pipe (19) and the oxygen-nitrogen separation baffle pipe (19) is fixed on the rear connecting plate (13), the positions of the front connecting plate (12) corresponding to the gaps between the high-strength magnetic rods (14) and the inner walls of the air guide pipes (11) are provided with a plurality of air inlets, the rear connecting plate (13) corresponding to the positions of the gaps between the high-strength magnetic rods (14) and the inner walls of the oxygen-nitrogen separation baffle pipe (19) are provided with a plurality of oxygen-enriched air outlets, the rear ends of each air guide pipe (11) corresponding to the side walls of the oxygen-nitrogen separation baffle pipe (19) are provided with the oxygen-enriched air outlets, the air guide fan (16) corresponding to the positions of the air guide pipe (16) are provided with the air inlets (16) corresponding to the air guide slots (16), the air guide fan (16) are arranged on the fixed slot (16), the fixed groove (15) is fixedly connected with the front connecting plate (12) through a plurality of air supply pipes (18), and each air supply pipe (18) is correspondingly communicated with one air inlet (17) and air inlets on a plurality of front connecting plates (12);
the gas collecting cover (2) is a conical cover body, a flange hole is arranged at the edge of the open end of the gas collecting cover (2), and an oxygen-enriched air supply pipe is arranged at the necking end of the gas collecting cover;
the rear connecting plate (13) and the fixing groove (15) are respectively provided with a flange hole, the adjacent oxygen-nitrogen separation units (1) are connected with the flange holes on the rear connecting plate (13) and the fixing groove (15) in a matched manner through bolts to realize sealed series connection, and the oxygen-nitrogen separation unit (1) at the rearmost end is connected with the gas collection cover (2) in a matched manner through bolts and the flange holes to realize sealed connection;
the air duct (11), the front connecting plate (12), the rear connecting plate (13), the fixing groove (15), the air supply pipe (18) and the oxygen-nitrogen separation baffle pipe (19) are all made of PVC materials.
2. The micro-power oxygen enrichment device according to claim 1, wherein: stainless steel fine coiled wires are fully adhered to the surface of the high-strength magnetic rod (14).
3. The micro-power oxygen enrichment device according to claim 2, wherein: the high-strength magnetic rod (14) is a Ru-Fe-B high-strength magnetic rod.
4. A micro-dynamic oxygen enrichment device according to any of claims 1-3, wherein: the magnetic field intensity of the high-strength magnetic rod (14) is 10000-15000 gauss.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910519391.0A CN110131718B (en) | 2019-06-17 | 2019-06-17 | Micro-power oxygen-enriching device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910519391.0A CN110131718B (en) | 2019-06-17 | 2019-06-17 | Micro-power oxygen-enriching device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110131718A CN110131718A (en) | 2019-08-16 |
| CN110131718B true CN110131718B (en) | 2024-03-19 |
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| CN201910519391.0A Active CN110131718B (en) | 2019-06-17 | 2019-06-17 | Micro-power oxygen-enriching device |
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| CN109422245A (en) * | 2017-08-20 | 2019-03-05 | 中国石油化工股份有限公司 | A kind of equipment for separating oxygen in air |
| CN207957925U (en) * | 2018-01-30 | 2018-10-12 | 开封迪尔空分实业有限公司 | A kind of magnetomotive low-purity oxygen plant |
| CN109307430A (en) * | 2018-11-06 | 2019-02-05 | 爱科科技有限公司 | A kind of ionization pole selects the pressurization of mangneto small particle to restore oxygen-enriched combustion-helping device |
| CN210197294U (en) * | 2019-06-17 | 2020-03-27 | 云南简澜环保科技有限公司 | Micro-power oxygen enrichment device |
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