CN213181249U - Trace nitric oxide measuring device - Google Patents
Trace nitric oxide measuring device Download PDFInfo
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- CN213181249U CN213181249U CN202022098761.9U CN202022098761U CN213181249U CN 213181249 U CN213181249 U CN 213181249U CN 202022098761 U CN202022098761 U CN 202022098761U CN 213181249 U CN213181249 U CN 213181249U
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- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 title claims abstract description 48
- 239000007789 gas Substances 0.000 claims abstract description 146
- 238000006243 chemical reaction Methods 0.000 claims abstract description 45
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000002912 waste gas Substances 0.000 claims abstract description 14
- 239000002245 particle Substances 0.000 claims abstract description 9
- 239000000523 sample Substances 0.000 claims description 45
- 238000010438 heat treatment Methods 0.000 claims description 8
- 238000007789 sealing Methods 0.000 claims description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- 238000000034 method Methods 0.000 abstract description 4
- 239000000203 mixture Substances 0.000 abstract description 4
- 238000001514 detection method Methods 0.000 abstract description 3
- 238000001917 fluorescence detection Methods 0.000 abstract description 3
- 238000005259 measurement Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 3
- 238000004020 luminiscence type Methods 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- 230000002238 attenuated effect Effects 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 230000003595 spectral effect Effects 0.000 description 2
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000005283 ground state Effects 0.000 description 1
- 238000002796 luminescence method Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000011017 operating method Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- Investigating Or Analysing Materials By The Use Of Chemical Reactions (AREA)
- Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
Abstract
The utility model belongs to nitric oxide concentration field among the chemiluminescence method measurement environment, concretely relates to trace nitric oxide measuring device. The utility model provides a trace nitric oxide measuring device, characterized by, mark gas input gas circuit: the pipeline of the standard gas generator is connected with an adjustable flowmeter A, and the pipeline of the adjustable flowmeter A is connected with a standard gas input pipeline; inputting sample gas into a gas circuit: the sample gas inlet pipeline is connected with a particle filter, the particle filter pipeline is connected with a dehydrator, and the dehydrator pipeline is connected with a sample gas input pipeline; exhaust gas discharge path: the waste gas discharge pipeline is connected with an adjustable flowmeter B, and the adjustable flowmeter B is connected with an exhaust port through a pipeline. The utility model has the advantages that the flow between the standard gas input pipeline and the sample gas input pipeline is controlled, and the center of the mixture of O3 gas and NO gas is ensured to be in the center of the sphere of the spherical reaction chamber; the light emitting area of the sphere center is directly projected or reflected by the inner cavity of the sphere and is concentrated on the photomultiplier behind the quartz glass lens, the fluorescence detection efficiency is more than 60 percent, and the light emitting detection limit is improved.
Description
Technical Field
The utility model belongs to nitric oxide concentration field among the chemiluminescence method measurement environment, concretely relates to trace nitric oxide measuring device.
Background
The principle of measuring the trace nitric oxide by a chemiluminescence method is as follows: NO and O3 gas are oppositely introduced into the reaction chamber, O3 reacts with NO to generate excited NO2 molecules, NO2 molecules cannot exist stably, the NO 3 molecules can quickly attenuate the NO2 returning to the ground state, the time is less than 1 nanosecond, fluorescence with the central wavelength of 1200nm is radiated, and the spectrum range is 600-3000 nm. The gas reaction is luminescence, and when O3 is excessive, the reaction that NO is completely exhausted can be approximately considered, and the measured fluorescence intensity signal is in direct proportion to the concentration of NO; the fluorescence light intensity signal is converted into a voltage signal, so that the trace nitric oxide in the environment can be accurately measured. The chemical reaction chamber is a key device for measuring nitric oxide. The spherical inner cavity is selected to reflect and converge fluorescence, and is called a spherical reaction chamber for short. The left and right cast aluminum hemispheres are selected, and the insides of hemispherical spherical shells are polished, so that the reflector is not only corrosion resistant, but also a good reflector surface. A series of holes which can be sealed are arranged along the clockwise direction from one side of the left hemispherical shell ball along the horizontal line, and a standard gas input pipeline, a temperature measuring probe, an exhaust pipeline, a sample gas input pipeline and a heating rod are sequentially arranged. Six flange lugs are arranged outside the spherical edges of the boundary surfaces of the left hemispherical shell and the right hemispherical shell at intervals of a central angle of 60 degrees, and threaded through hole bolts are arranged in the centers of the flange lugs; sealing gaskets are added on the interfaces of the left hemispherical shell and the right hemispherical shell, and the left hemispherical shell and the right hemispherical shell are mechanically connected and folded through flange lugs and threaded through holes and bolts of the outer spherical edge to form an airtight shading spherical reaction chamber inside; inside the spherical reaction chamber, the standard gas input pipeline and the sample gas input pipeline are arranged on the same diameter passing through the spherical center and are oppositely arranged along the spherical center of the spherical shell, the intersection point of the two gases is the spherical center of the spherical shell, the intersection point is a chemiluminescence point, and the chemiluminescence point is concentrated on the spherical center; the exhaust pipeline, the standard gas input pipeline and the sample gas input pipeline are arranged on the junction plane of the left and right hemispherical shells, and the whole process of the excitation and luminescence of the intersection and mixing of the two gases in the spherical reaction chamber is arranged on the intersection plane of the left and right hemispherical shells, namely the luminescence plane is arranged on the intersection plane of the left and right hemispherical shells; the luminous point and the luminous surface penetrate through the flat quartz glass lens rightwards and are optically connected with the closed shading photomultiplier; the luminous point and the luminous surface are leftwards, pass through the flat quartz glass lens after being reflected by the left hemispherical shell, and are optically connected with the closed shading photomultiplier; the photomultiplier is electrically connected with the linear amplifier, the linear amplifier is electrically connected with the analog-to-digital conversion module, the analog-to-digital conversion module is electrically connected with the MCU minimum system, and the MCU minimum system displays the concentration of nitric oxide through a display screen; the MCU minimum system, the temperature control module, the heating rod and the temperature measuring probe form a closed-loop temperature control system inside the sphere, and the inside of the sphere is ensured to be in an optimal light-emitting temperature range.
Disclosure of Invention
The utility model aims at providing an instrument for measuring trace nitric oxide gas by a luminescence method.
The technical scheme of the utility model: a trace nitric oxide measuring device comprises a spherical reaction chamber, a standard gas input gas path, a sample gas input gas path, a waste gas discharge gas path, a flat quartz glass lens, a photomultiplier, a linear amplifier, an analog-to-digital conversion module, an MCU minimum system, a display screen and a temperature control module, and is characterized in that the spherical reaction chamber adopts left and right cast aluminum hemispherical shells, the inner parts of the left and right hemispherical shell cavities are polished, and the inner radius of the hemispherical shell is R; a spherical crown window is cut at the bottom of the right hemispherical shell, and the circular radius of the spherical crown is R/2; arranging a sealing gasket and a flat quartz glass lens at the position of the window, wherein the radius of the flat quartz glass lens is R/2; a shading closed chamber is arranged outside the flat quartz glass lens, and a photomultiplier is arranged in the shading closed chamber; a series of holes which can be sealed are arranged on one side of the left hemispherical shell ball along the horizontal line in the clockwise direction, and a standard gas input pipeline, a temperature measuring probe, an exhaust pipeline, a sample gas input pipeline and a heating rod are sequentially arranged, wherein the standard gas input pipeline and the sample gas input pipeline are on the same diameter passing through the center of the ball; six flange lugs are arranged outside the spherical edges of the boundary surfaces of the left hemispherical shell and the right hemispherical shell at intervals of a central angle of 60 degrees, and threaded through hole bolts are arranged in the centers of the flange lugs; sealing gaskets are added on the interfaces of the left hemispherical shell and the right hemispherical shell, and the left hemispherical shell and the right hemispherical shell are mechanically connected and folded through flange lugs and threaded through holes and bolts of the outer spherical edge to form an airtight shading spherical reaction chamber inside; the outside of the spherical reaction chamber is respectively provided with a standard gas input gas circuit, a sample gas input gas circuit, a waste gas discharge gas circuit and a left and a right photomultiplier; the standard gas is input into the gas circuit: the pipeline of the standard gas generator is connected with an adjustable flowmeter A, and the pipeline of the adjustable flowmeter A is connected with a standard gas input pipeline; the sample gas is input into the gas circuit: the sample gas inlet pipeline is connected with a particle filter, the particle filter pipeline is connected with a dehydrator, and the dehydrator pipeline is connected with a sample gas input pipeline; the waste gas discharge gas circuit: the waste gas discharge pipeline is connected with an adjustable flowmeter B, and the adjustable flowmeter B is connected with an exhaust port through a pipeline; inside the spherical reaction chamber, the standard gas input pipeline and the sample gas input pipeline are arranged on the same diameter passing through the spherical center and are oppositely arranged along the spherical center of the spherical shell, the intersection point of the two gases is the spherical center of the spherical shell, the intersection point is a chemiluminescence point, and the chemiluminescence point is concentrated on the spherical center; the spherical center luminous point penetrates through the flat quartz glass lens to be optically connected with the photomultiplier, the photomultiplier is electrically connected with the linear amplifier, the linear amplifier is electrically connected with the analog-to-digital conversion module, the analog-to-digital conversion module is electrically connected with the MCU minimum system, and the MCU minimum system is electrically connected with the display screen; the MCU minimum system is electrically connected with the temperature control module, and the temperature control module is electrically connected with the heating rod and the temperature probe.
The utility model relates to a trace nitric oxide measuring device's theory of operation brief states:
inside the spherical reaction chamber: the MCU minimum system is electrically connected with the temperature control module, the temperature control module is electrically connected with the heating rod and the temperature probe to form a temperature control system, and the temperature in the ball is kept at 50 ℃; the standard gas O3 input pipeline is thick, the sample gas NO input pipeline is thin and is arranged oppositely along the radius, the junction point of the two gases is near the center of the sphere, and O3 wraps NO gas; NO reacts with O3 to generate excited NO2 molecules, while NO2 molecules cannot exist stably, and can be rapidly attenuated to ground NO2, and emit fluorescence with the central wavelength of 1200nm, the spectral range of the fluorescence is 600-3000 nm, and the light-emitting point is near the center of a sphere; the flat quartz glass lens is selected, and can pass 1200nm fluorescence. The exhaust pipeline is perpendicular to the connecting line of the standard gas input pipeline and the sample gas input pipeline, the two gases are exhausted by the exhaust pipeline after meeting, and the gas luminous band is arranged on the interface of the left hemisphere and the right hemisphere. Outside the spherical reaction chamber: the pipeline of the standard gas generator is connected with an adjustable flowmeter A, and the pipeline of the adjustable flowmeter A is connected with a standard gas O3 input pipeline; the pipeline of the sample gas sampling port is connected with a dehydrator, the pipeline of the dehydrator is connected with a particle filter, and the pipeline of the particle filter is connected with a sample gas input pipeline; the waste gas discharge gas path pipeline is connected with an adjustable flowmeter B, the adjustable flowmeter B is connected with an air pump through a pipeline, and the air pump pipeline is connected with a waste gas discharge port; starting the air pump, adjusting an adjustable flowmeter A of the standard gas path, adjusting an adjustable flowmeter B of the waste gas discharge gas path, controlling the flow rates of the sample gas ozone input pipeline and the standard gas NO input pipeline, and ensuring the total luminous reaction of the O3 gas; the flow of the standard gas input pipeline and the flow of the sample gas input pipeline are adjusted to ensure the whole luminous reaction of O3 gas. Where the gases mix, where they fluoresce; fluorescence is in the center of the sphere of the spherical reaction chamber, the joint surface of the left and right cast aluminum hemispheres is a luminous surface, and the distance from the flat quartz glass lens of the right hemisphere is close to the radius of the sphere of 0.707R; the light movement locus of the fluorescence has two tracks, 1 direct projection: a flat quartz glass lens with the luminous point rightwards reaching the bottom of the right hemispherical shell; 2, reflection: the luminous point is reflected leftwards through the left hemispherical shell and reaches the flat quartz glass lens at the bottom of the right hemispherical shell, and the optical connection is realized through a photomultiplier. The photomultiplier is electrically connected with the linear amplifier, the linear amplifier is electrically connected with the analog-to-digital conversion module, the analog-to-digital conversion module is electrically connected with the MCU minimum system, the MCU minimum system calculates a light intensity signal, and the concentration of nitric oxide is displayed on a display screen.
The utility model has the advantages that the spherical reaction chamber with the suitable radius is selected, the distance between the standard gas input pipeline and the sample gas input pipeline is controlled, and the center of the mixture of O3 gas and NO gas is ensured to be in the sphere center of the spherical reaction chamber; the spherical center light emitting area is directly projected or reflected through the spherical inner cavity and is concentrated to the photomultiplier behind the flat quartz glass lens, the fluorescence detection efficiency is more than 60 percent, and the light emitting detection limit is improved; the left hemisphere and the right hemisphere are arranged, so that the flat quartz glass lens can be conveniently and periodically scrubbed.
Drawings
Fig. 1 is a schematic structural diagram of a trace nitric oxide measuring apparatus.
Fig. 2 is a schematic diagram of a left hemispherical shell structure of a trace nitric oxide measuring device.
Fig. 3 is a schematic diagram of a right hemispherical shell structure of a trace nitric oxide measuring apparatus.
In the figure, 1, a left hemispherical shell, 2, six flange lugs, 3, a standard gas input pipeline, 4, a temperature measuring probe, 5, an exhaust pipeline, 6, a sample gas input pipeline, 7, a heating rod, 8, a sealing gasket, 9, a flat quartz glass lens, 10, a right hemispherical shell, 11, a spherical reaction chamber, 12, a standard gas input gas circuit, 12.1, a standard gas generator, 12.2, an adjustable flowmeter A, 13, a sample gas input gas circuit, 13.1, a particle filter, 13.2, a dehydrator, 13.3, a sample gas sampling port, 14, an exhaust gas discharge gas circuit, 14.1, an adjustable flowmeter B, 14.2, an air pump, 14.3, an exhaust gas discharge port, 15, a photomultiplier, 16, a linear amplifier, 17, an analog-to-digital conversion module, 18, an MCU minimum system, 19, a display screen, 20 and a temperature control module are included.
Detailed Description
The luminescent measuring device of XHX-NO trace nitric oxide is taken as an example and is described as follows by combining the attached figure 1 of the specification: the design idea of the spherical luminous chamber of the XHX- -O3 luminous measuring device for trace nitric oxide is as follows, and the luminous measuring device comprises chemiluminescence attenuation distance, fixed sphere inner cavity radius, sphere volume, air quantity, pipe diameter 1 ratio, flow speed and flow. Examining the chemiluminescence handbook, wherein the fluorescence attenuation distance is 100 mm; the intracavity reflection optical path 3R is less than 100 mm, so the radius R of the inner cavity of the sphere is equal to 30 mm. The inner diameter of the flat quartz glass lens, from which the spherical cap is cut off by 60 degrees, is 30 mm. The volume of the sphere lumen was calculated to be 113 ml. The diameter of the standard gas input pipeline is 0.20 mm to 1.2 mm, and is selected to be 0.5 mm and 5 mm away from the center of the sphere; the pipe diameter of the sample gas input pipeline is 3 mm-12 mm, 5 mm is selected, and the distance from the center of the sphere is 0.5 mm. At a proper temperature of 50 ℃, the thickness of the standard gas input pipeline inside the spherical reaction chamber is equal to or less than 0.5 mm, and the distance from the outlet end to the center of the sphere is 5 mm; the thick back of sample gas input pipeline =5 millimeters, distance. The outlet end is 0.5 mm away from the center of the sphere. The two gases are oppositely arranged along the radius, the junction point of the two gases is near the center of the sphere, and NO wraps O3 gas; NO reacts with O3 to generate excited NO2 molecules, NO2 molecules cannot exist stably, the excited NO2 molecules can be rapidly attenuated to ground NO2, the time is less than 1 nanosecond, fluorescence with the central wavelength of 1200nm is radiated, the spectral range of the fluorescence is 600-3000 nm, and the light-emitting point is near the center of a sphere; operating procedure of the nitric oxide measuring device: connecting a sample gas inlet gas circuit and a waste gas discharge gas circuit; and (3) turning on a power supply, starting the MCU minimum system, the photomultiplier and the temperature control module to work, displaying the temperature of the long-axis ellipsoidal reaction chamber by the display screen, and displaying the concentration to be zero. The temperature of the isometric ellipsoidal reaction chamber enters a set value and starts to be kept warm; starting the air pump, opening the standard gas generator, adjusting the adjustable flowmeter A and the adjustable flowmeter B, and starting to intake the standard gas intake path and the sample gas intake path. The exhaust pipeline is perpendicular to the connecting line of the standard gas input pipeline and the sample gas input pipeline, the exhaust pipeline points to the center of the sphere, the two gases are discharged from the exhaust pipeline after meeting, and the gas luminous band is arranged on the interface of the left hemisphere and the right hemisphere; the distance between the standard gas input pipeline and the sample gas input pipeline is adjusted, and the flow is adjusted, so that the center of NO gas injected by O3 gas is ensured, and all O3 gas is subjected to luminous reaction. All the light emitted passes through the flat quartz glass lens and reaches the light-shielding and closed photomultiplier tube, and is converted into an electric signal. The electrical signal strength is proportional to the optical signal strength. The electric signal enters the MCU minimum system after linear amplification and analog-to-digital conversion. The MCU minimum system outputs the concentration of O3 gas. The detected concentration of O3 gas was 1.0ppb by experimental test. And (3) closing a nitric oxide measuring device program: firstly, the standard gas generator is closed, and the gas pump is closed after the concentration indication is zero; closing the adjustable flowmeter A and the adjustable flowmeter B; and turning off the power supply of the nitric oxide measuring device. And finally, disconnecting the sample gas inlet gas circuit and the waste gas exhaust gas circuit.
The utility model has the advantages that the spherical reaction chamber is selected, the distance between the standard gas input pipeline and the sample gas input pipeline is controlled, and the center of the mixture of O3 gas and NO gas is ensured to be in the center of the sphere of the spherical reaction chamber; the spherical center light emitting area is directly projected or reflected through the spherical inner cavity and is concentrated to the photomultiplier behind the flat quartz glass lens, the fluorescence detection efficiency is more than 60 percent, and the light emitting detection limit is improved; the left hemisphere and the right hemisphere are arranged, so that the flat quartz glass lens can be conveniently and periodically scrubbed.
Claims (1)
1. A trace nitric oxide measuring device comprises a spherical reaction chamber, a standard gas input gas path, a sample gas input gas path, a waste gas discharge gas path, a flat quartz glass lens, a photomultiplier, a linear amplifier, an analog-to-digital conversion module, an MCU minimum system, a display screen and a temperature control module, and is characterized in that the spherical reaction chamber adopts left and right cast aluminum hemispherical shells, the inner parts of the left and right hemispherical shell cavities are polished, and the inner radius of the hemispherical shell is R; a spherical crown window is cut at the bottom of the right hemispherical shell, and the circular radius of the spherical crown is R/2; arranging a sealing gasket and a flat quartz glass lens at the position of the window, wherein the radius of the flat quartz glass lens is R/2; a shading closed chamber is arranged outside the flat quartz glass lens, and a photomultiplier is arranged in the shading closed chamber; a series of holes which can be sealed are arranged on one side of the left hemispherical shell ball along the horizontal line in the clockwise direction, and a standard gas input pipeline, a temperature measuring probe, an exhaust pipeline, a sample gas input pipeline and a heating rod are sequentially arranged, wherein the standard gas input pipeline and the sample gas input pipeline are on the same diameter passing through the center of the ball; six flange lugs are arranged outside the spherical edges of the boundary surfaces of the left hemispherical shell and the right hemispherical shell at intervals of a central angle of 60 degrees, and threaded through hole bolts are arranged in the centers of the flange lugs; sealing gaskets are added on the interfaces of the left hemispherical shell and the right hemispherical shell, and the left hemispherical shell and the right hemispherical shell are mechanically connected and folded through flange lugs and threaded through holes and bolts of the outer spherical edge to form an airtight shading spherical reaction chamber inside; the outside of the spherical reaction chamber is respectively provided with a standard gas input gas circuit, a sample gas input gas circuit, a waste gas discharge gas circuit and a left and a right photomultiplier; the standard gas is input into the gas circuit: the pipeline of the standard gas generator is connected with an adjustable flowmeter A, and the pipeline of the adjustable flowmeter A is connected with a standard gas input pipeline; the sample gas is input into the gas circuit: the sample gas inlet pipeline is connected with a particle filter, the particle filter pipeline is connected with a dehydrator, and the dehydrator pipeline is connected with a sample gas input pipeline; the waste gas discharge gas circuit: the waste gas discharge pipeline is connected with an adjustable flowmeter B, and the adjustable flowmeter B is connected with an exhaust port through a pipeline; inside the spherical reaction chamber, the standard gas input pipeline and the sample gas input pipeline are arranged on the same diameter passing through the spherical center and are oppositely arranged along the spherical center of the spherical shell, the intersection point of the two gases is the spherical center of the spherical shell, the intersection point is a chemiluminescence point, and the chemiluminescence point is concentrated on the spherical center; the spherical center luminous point penetrates through the flat quartz glass lens to be optically connected with the photomultiplier, the photomultiplier is electrically connected with the linear amplifier, the linear amplifier is electrically connected with the analog-to-digital conversion module, the analog-to-digital conversion module is electrically connected with the MCU minimum system, and the MCU minimum system is electrically connected with the display screen; the MCU minimum system is electrically connected with the temperature control module, and the temperature control module is electrically connected with the heating rod and the temperature probe.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022098761.9U CN213181249U (en) | 2020-09-23 | 2020-09-23 | Trace nitric oxide measuring device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022098761.9U CN213181249U (en) | 2020-09-23 | 2020-09-23 | Trace nitric oxide measuring device |
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| Publication Number | Publication Date |
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| CN213181249U true CN213181249U (en) | 2021-05-11 |
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| CN202022098761.9U Active CN213181249U (en) | 2020-09-23 | 2020-09-23 | Trace nitric oxide measuring device |
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| CN (1) | CN213181249U (en) |
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- 2020-09-23 CN CN202022098761.9U patent/CN213181249U/en active Active
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Address after: 044000, No. 4886 Dayu Street, Yuncheng Economic and Technological Development Zone, Yuncheng City, Shanxi Province Patentee after: Shanxi Xinhuaxiang Technology Co.,Ltd. Country or region after: China Address before: 044000 xinhuaxiang company, 4th floor, building 1, Jihua Industrial Logistics Park, Gangfu Avenue, Konggang South District, Yuncheng City, Shanxi Province Patentee before: SHANXI XIN HUAXIANG TECHNOLOGY DEVELOPMENT Co.,Ltd. Country or region before: China |
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