CN106353380A - Server cabinet - Google Patents
Server cabinet Download PDFInfo
- Publication number
- CN106353380A CN106353380A CN201610936698.7A CN201610936698A CN106353380A CN 106353380 A CN106353380 A CN 106353380A CN 201610936698 A CN201610936698 A CN 201610936698A CN 106353380 A CN106353380 A CN 106353380A
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- CN
- China
- Prior art keywords
- gas sensor
- server cabinet
- gas
- solid electrolyte
- nasicon
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000007784 solid electrolyte Substances 0.000 claims abstract description 20
- 239000000463 material Substances 0.000 claims abstract description 7
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 abstract description 5
- -1 compound carbonate Chemical class 0.000 abstract description 4
- 239000002226 superionic conductor Substances 0.000 abstract description 2
- 239000002228 NASICON Substances 0.000 abstract 1
- 229910000030 sodium bicarbonate Inorganic materials 0.000 abstract 1
- UIIMBOGNXHQVGW-UHFFFAOYSA-M sodium bicarbonate Substances [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 40
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 22
- 229910052571 earthenware Inorganic materials 0.000 description 12
- 239000001569 carbon dioxide Substances 0.000 description 11
- 229910002092 carbon dioxide Inorganic materials 0.000 description 11
- 239000000203 mixture Substances 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 230000035945 sensitivity Effects 0.000 description 5
- 238000005245 sintering Methods 0.000 description 5
- 238000001514 detection method Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 229910001415 sodium ion Inorganic materials 0.000 description 2
- 238000003836 solid-state method Methods 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 1
- 241001465754 Metazoa Species 0.000 description 1
- 229910003249 Na3Zr2Si2PO12 Inorganic materials 0.000 description 1
- FKNQFGJONOIPTF-UHFFFAOYSA-N Sodium cation Chemical compound [Na+] FKNQFGJONOIPTF-UHFFFAOYSA-N 0.000 description 1
- 241001464837 Viridiplantae Species 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000012271 agricultural production Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 150000001768 cations Chemical class 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003610 charcoal Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 235000011869 dried fruits Nutrition 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000005518 electrochemistry Effects 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000009432 framing Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 150000002484 inorganic compounds Chemical class 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000007578 melt-quenching technique Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 230000009965 odorless effect Effects 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 231100000572 poisoning Toxicity 0.000 description 1
- 230000000607 poisoning effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000000241 respiratory effect Effects 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 238000004528 spin coating Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/28—Electrolytic cell components
- G01N27/30—Electrodes, e.g. test electrodes; Half-cells
Abstract
The invention relates to a server cabinet. The server cabinet comprises a server cabinet body, wherein the outer wall of the server cabinet body is provided with a CO2 gas sensor; and the CO2 gas sensor is a tubular heating type solid electrolyte CO2 gas sensor. Specifically, the CO2 gas sensor uses a NASICON (Na<+> superionic conductor) material as solid electrolyte, and a sensitive electrode of the CO2 gas sensor is Li2CO3-BaCO3-NaHCO3 compound carbonate.
Description
Technical field
The application is related to server field, more particularly, to a kind of server cabinet.
Background technology
Server cabinet is the cabinet placing server, and at present, the cabinet type of server cabinet is according to existing 19 English
The standard of very little server is designed, and due to server long-play, generation heat is more, also can deposit inside server cabinet
In a large amount of gases, the presence of the harmful gass such as especially co2 can cause certain potential safety hazard to operator.
Content of the invention
The present invention is intended to provide a kind of server cabinet, to solve problem set forth above.
A kind of server cabinet is provided, including server cabinet body, described server machine in embodiments of the invention
Cabinet body outer wall is provided with co2Gas sensor, described co2Gas sensor is tubular type hot type solid electrolyte formula co2Gas passes
Sensor, specifically, described co2Gas sensor using nasicon material as solid electrolyte, described co2Gas sensor quick
Electrification extremely li2co3-baco3-nahco3Compound carbonate.
The technical scheme that embodiments of the invention provide can include following beneficial effect:
The present invention is by being provided with co in server cabinet body outer wall2Gas sensor, it is to co2The detection of gas is sensitive
Degree is high, as the co containing excess in environment2, this co2Gas sensor can in time, accurately detect, and water-tolerant makes
With life-span length, thus solving problem set forth above.
The aspect that the application adds and advantage will be set forth in part in the description, and partly will become from the following description
Obtain substantially, or recognized by the practice of the application.It should be appreciated that above general description and detailed description hereinafter are only
It is exemplary and explanatory, the application can not be limited.
Brief description
Using accompanying drawing, the invention will be further described, but the embodiment in accompanying drawing does not constitute any limit to the present invention
System, for those of ordinary skill in the art, on the premise of not paying creative work, can also obtain according to the following drawings
Other accompanying drawings.
Fig. 1 is the structural representation of server cabinet of the present invention.
Fig. 2 is co of the present invention2The structural representation of gas sensor.
Specific embodiment
Here will in detail exemplary embodiment be illustrated, its example is illustrated in the accompanying drawings.Explained below is related to
During accompanying drawing, unless otherwise indicated, the same numbers in different accompanying drawings represent same or analogous key element.Following exemplary embodiment
Described in embodiment do not represent all embodiments consistent with the present invention.On the contrary, they be only with such as appended
The example of the consistent apparatus and method of some aspects being described in detail in claims, the present invention.
Three big pillars of hyundai electronicses information technology are sensor technology, mechanics of communication and computer technology, wherein, sensing
Device is acquisition of information and the core exchanging.Gas sensor is an important branch of sensor field, and it can experience extraneous
Atmosphere information is simultaneously converted to according to certain rules and can survey signal；The chance that modern society people contact gas with various gets more and more,
It is therefore desirable to its gas componant is analyzed, detects and is reported to the police, therefore, gas sensor is in industrial and agricultural production, family
The fields such as safety, environmental monitoring, the energy, medical treatment have very important effect.
Carbon dioxide is a kind of common inorganic compound, colorless and odorless under room temperature, water soluble, and density ratio air is big.
In nature, carbon dioxide content enriches, and is a part for Atmospheric composition, carbon dioxide can pass through multiple ways
Footpath produces, and such as, Organic substance, during decomposing, fermenting, rot etc., can supervene carbon dioxide；In oil, paraffin, coal
In the combustion process of the fuel such as charcoal, natural gas, great amount of carbon dioxide can be produced；All animals, will oxygen uptake in respiratory
Produce carbon dioxide；All green plantss all absorbing carbon dioxide release oxygen；In addition, the production of industry, city operating, traffic
Discharge carbon dioxide Deng all be unableing to do without.Because carbon dioxide is a kind of asphyxiating gass, its concentration exceedes certain limit, can cause
The poisoning of people, additionally, in agricultural, gas concentration lwevel plays an important role for the growth of crop, carbon dioxide gass
Body is the main component of greenhouse gases simultaneously.Therefore, monitoring and warning for carbon dioxide seem abnormal important.
nasicon(na+Superionic conductor) material chemical formula be na3zr2si2po12, it is
nazr2p3o12-na4zr2si3o12One of solid solution system, the structure of nasicon compound is by zro6Octahedron and po4Or
sio4The framing structure that tetrahedron is collectively forming, after the octahedra composition skeleton with tetrahedron, forms three-dimensional skeleton gap, these
Gap constitutes passage, na+Ion is located between skeleton gap, thus the three-dimensional channel isotropism that can be constituted along these gaps
Conduction, there is higher ionic conduction efficiency, belong to high temperature cation solid-electrolyte, commonly referred to as sodium ion is quickly led
Body；At present, nasicon material has in fields such as dye cell, chemical ion sensitive electrode, electrochemical sensors and widely should
With especially in sensor field, with it for so of solid electrolyte preparation2、co2、noxIt is one Deng electrochemistry of solids formula sensor
Plant the device form with good application prospect.
Embodiments herein is related to a kind of server cabinet, as shown in figure 1, including server cabinet body 1, described clothes
Business device cabinet body 1 outer wall is provided with co2Gas sensor 2.
The present invention is by being provided with co in server cabinet body outer wall2Gas sensor, it is to co2The detection of gas is sensitive
Degree is high, as the co containing excess in environment2, this co2Gas sensor can in time, accurately detect, and water-tolerant makes
Use life-span length.
Preferably, as Fig. 2, described co2Gas sensor 2 is tubular type hot type solid electrolyte formula co2Gas sensor；
Specifically, this co2Gas sensor 2 is with al2o3Earthenware 10 is substrate, and surface is provided with nasicon solid electrolyte layer 60,
al2o3One end of earthenware 10, is provided with au film 30, pt electrode 40, in al on nasicon solid electrolyte layer 602o3Earthenware
10 other end, is provided with au film 30, pt electrode 40 and sensitive electrode 50, al on nasicon solid electrolyte layer 602o3Pottery
The heating coil 20 having 100 ω in the middle of pipe 10 passes through as heater.
In the application, described co2Gas sensor adopts solid electrolyte form, because solid electrolyte intermediate ion is conductive
Property preferable at high temperature, therefore, in al2o3The centre of earthenware is provided with heating coil, additionally, in al2o3Ceramic pipe surface, according to
Secondary it is provided with au film, pt electrode and sensitive electrode, using in co2In environment, pt electrode and the electric potential difference of sensitive electrode measure co2Contain
Amount, au film has higher electric conductivity, it is possible to increase to co2Sensitivity, and then so that server cabinet is to co2Susceptiveness
Higher.
Preferably, described nasicon solid electrolyte adopts high temperature solid-state method to prepare, and high temperature sintering temperature is 1050 DEG C,
The average particle size of nasicon solid electrolyte is 20nm.
The solid electrolyte of sensor in the application, is done using the nasicon material of high temperature solid-state method preparation, prepared
Loose installation manufacturing process is simple and practical it is easy to compressing, is conducive in server cabinet of this nasicon material powder.
Preferably, described sensitive electrode 50 is compound carbonate, the specially li of mol ratio 4:1:12co3-baco3-
nahco3Compound carbonate, and, it is added with ni nanometer powder, glass dust in described compound carbonate, content respectively 6%,
9.5%；The particle diameter of described ni nanometer powder is 20nm.
In the application, sensitive electrode is compound carbonate, wherein, li2co3Show good hygroscopicity, improve sensor
Resistance to water, nahco3In high-temperature sintering process, a part can be decomposed and discharged gas, and this gas breaks through sensitive electrode material,
Produce pore-creating effect, the raising being conducive to sensitive electrode surfaces to amass, increased the sensitivity of device.
Further preferably, described co2The preparation process of gas sensing is as follows:
Step one, prepares nasicon solid electrolyte
Choose na3po4·12h2O, zrsio4, sio2According to stoichiometric proportion mixing, it is fully ground 10h, obtains mixture,
Then ground mixture is placed in pottery side's ship, puts in high temperature resistance furnace, the ramp according to 5 DEG C/min arrives
800 DEG C, be incubated 2h, then quick (14 DEG C/min) be warmed up to 1050 DEG C, be incubated 20h, more at the uniform velocity cooling (8 DEG C/min) be to 500
DEG C, last Temperature fall is to room temperature；The above mixture through high temperature sintering is taken out from stove, grinds to form superfine powder, that is,
Obtain nasicon solid electrolyte.
Step 2, prepares co2Gas sensor
A) choose al2o3Earthenware 10, dries after cleaning, and earthenware specification is pipe range 10mm, thickness of pipe wall 0.5mm, and external diameter is
1.5mm；
B) nasicon obtaining in step one solid electrolyte is added deionized water, grind to form starchiness, then use
Spin-coating method is uniformly coated in al2o3 earthenware 10 surface,
C) al2o3 earthenware 10 is put in resistance furnace, sinter 1.5h at 600 DEG C；
D) repeat step b, c twice, then by al2o3Earthenware high temperature sintering 8h at 900 DEG C, forming thickness is 0.5mm
Nasicon solid electrolyte layer 60；
E) and then in al2o3One layer of au film 30 is prepared at the two ends of earthenware 10, and thickness is 500 μm, draws on au film 30 surface
Pt electrode 40, sintering temperature is 500 DEG C；
F) in al2o3Sensitive electrode 50, the pt electrode 40 of the other end are produced using melt quenching method in one end of earthenware 10
As reference electrode；
G) and then by the heating coil 20 of about 50 ω pass through al2o3Earthenware 10 is as heater；
H) finally wire is welded on pt electrode 40 and sensitive electrode 50, obtains co2Gas sensor 6.
Preferably, to co in the server cabinet of the application2Gas sensor is tested: takes the electric current in heating coil to be
150ma, with pure co2Gas and air mix to be equipped with the sample gas of variable concentrations, wherein co2The excursion of concentration is 500
8000×10-6Volume fraction, in the case that then in test circuit, resistance is constant, the electricity of test sensitive electrode and reference electrode
Potential difference, and by this potential difference (mv) with co2The slope of curve of gas concentration is defined as sensitivity, and test obtains this co2Gas sensing
The sensitivity of device is 69, and then, the server cabinet of the application is capable of to co2The accurate detection of gas.
To co in the server cabinet of the application2Gas sensor carries out water resistance test: identical by two of the application
co2Gas sensor is respectively in same concentrations co2In sample gas and sample gas that relative humidity be 60% measurement sensitivity, knot are dried
Fruit shows, sensitivity rate of change is 9%, shows this co2Gas sensor has preferable resistance to water, and then, work as server machine
When in cabinet local environment, humidity is larger, this server cabinet still enables to co2The accurate detection of gas, resistance to water is preferable.
The foregoing is only the preferred mode of the present invention, not in order to limit the present invention, all spirit in the present invention and former
Within then, any modification, equivalent substitution and improvement made etc., should be included within the scope of the present invention.
Claims (2)
1. a kind of server cabinet, including server cabinet body it is characterised in that described server cabinet body outer wall is provided with
co2Gas sensor.
2. a kind of server cabinet according to claim 1 is it is characterised in that described co2Gas sensor heats for tubular type
Type solid electrolyte formula co2Gas sensor, specifically, described co2Gas sensor is using nasicon material as solid electrolytic
Matter, described co2The sensitive electrode of gas sensor is li2co3-baco3-nahco3Compound carbonate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610936698.7A CN106353380B (en) | 2016-11-01 | 2016-11-01 | Server cabinet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610936698.7A CN106353380B (en) | 2016-11-01 | 2016-11-01 | Server cabinet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106353380A true CN106353380A (en) | 2017-01-25 |
| CN106353380B CN106353380B (en) | 2019-09-27 |
Family
ID=57864011
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610936698.7A Active CN106353380B (en) | 2016-11-01 | 2016-11-01 | Server cabinet |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106353380B (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2580440Y (en) * | 2002-11-18 | 2003-10-15 | 吉林大学 | Thin film small hollow tubular solid electrolyte CO2 sensor |
| CN201141848Y (en) * | 2008-01-14 | 2008-10-29 | 吉林大学 | Integrated dual-function NASICON solid electrolyte gas sensor |
| WO2013073222A1 (en) * | 2011-11-16 | 2013-05-23 | 株式会社東芝 | Air conditioning system and air conditioning control method for server room management |
| EP2806225A1 (en) * | 2012-01-18 | 2014-11-26 | Kabushiki Kaisha Toshiba | Air-conditioning apparatus and method for controlling air conditioning |
| CN105548142A (en) * | 2015-12-02 | 2016-05-04 | 邱炎新 | Server cabinet with gas alarming function and manufacturing method thereof |
| CN105698340A (en) * | 2016-03-23 | 2016-06-22 | 珠海格力电器股份有限公司 | Control system of computer room air conditioner, and modular computer room air conditioner system and control method thereof |
| CN106053728A (en) * | 2016-06-12 | 2016-10-26 | 肖小玉 | Anti-thunder power distribution cabinet based on gas detection function |
| CN106124617A (en) * | 2016-06-12 | 2016-11-16 | 肖小玉 | A kind of based on high reliability NO2the server cabinet of detection |
-
2016
- 2016-11-01 CN CN201610936698.7A patent/CN106353380B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2580440Y (en) * | 2002-11-18 | 2003-10-15 | 吉林大学 | Thin film small hollow tubular solid electrolyte CO2 sensor |
| CN201141848Y (en) * | 2008-01-14 | 2008-10-29 | 吉林大学 | Integrated dual-function NASICON solid electrolyte gas sensor |
| WO2013073222A1 (en) * | 2011-11-16 | 2013-05-23 | 株式会社東芝 | Air conditioning system and air conditioning control method for server room management |
| EP2806225A1 (en) * | 2012-01-18 | 2014-11-26 | Kabushiki Kaisha Toshiba | Air-conditioning apparatus and method for controlling air conditioning |
| CN105548142A (en) * | 2015-12-02 | 2016-05-04 | 邱炎新 | Server cabinet with gas alarming function and manufacturing method thereof |
| CN105698340A (en) * | 2016-03-23 | 2016-06-22 | 珠海格力电器股份有限公司 | Control system of computer room air conditioner, and modular computer room air conditioner system and control method thereof |
| CN106053728A (en) * | 2016-06-12 | 2016-10-26 | 肖小玉 | Anti-thunder power distribution cabinet based on gas detection function |
| CN106124617A (en) * | 2016-06-12 | 2016-11-16 | 肖小玉 | A kind of based on high reliability NO2the server cabinet of detection |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106353380B (en) | 2019-09-27 |
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Effective date of registration: 20190903 Address after: Room A-B102-785, 198 Kaidi Road, Xiaoshan Economic and Technological Development Zone, Hangzhou, Zhejiang Province, 311200 Applicant after: HANGZHOU XIAONAN TECHNOLOGY CO.,LTD. Address before: 518000 Guangdong city of Shenzhen province Nanshan District Guangdong streets high tech Park high-tech South Road No. 9 South Gate Branch building room 1206 Applicant before: SHENZHEN DATU KECHUANG TECHNOLOGY DEVELOPMENT CO.,LTD. |
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Effective date of registration: 20201123 Address after: 241000 No.16 longan West Road, Gaogou Town, Wuhu City, Anhui Province Patentee after: He Yonggang Address before: Room A-B102-785, 198 Kaidi Road, Xiaoshan Economic and Technological Development Zone, Hangzhou, Zhejiang Province, 311200 Patentee before: HANGZHOU XIAONAN TECHNOLOGY Co.,Ltd. |
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Effective date of registration: 20240108 Address after: 714026 Building 1-702, No. 9 Commercial Street, Middle Section of Xinsheng Road, High tech Industrial Development Zone, Weinan City, Shaanxi Province Patentee after: Weinan High tech Zone Yichen Science and Trade Co.,Ltd. Address before: 241000 No.16, longan West Road, Gaogou Town, Wuhu City, Anhui Province Patentee before: He Yonggang |
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