CN102614803B - Dynamic generator for multicomponent low-concentration standard gas - Google Patents
Dynamic generator for multicomponent low-concentration standard gas Download PDFInfo
- Publication number
- CN102614803B CN102614803B CN201210073801.1A CN201210073801A CN102614803B CN 102614803 B CN102614803 B CN 102614803B CN 201210073801 A CN201210073801 A CN 201210073801A CN 102614803 B CN102614803 B CN 102614803B
- Authority
- CN
- China
- Prior art keywords
- gas
- pipeline
- collector
- gas collector
- liquid injection
- 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.)
- Active
Links
- 239000007789 gas Substances 0.000 claims abstract description 128
- 238000002347 injection Methods 0.000 claims abstract description 30
- 239000007924 injection Substances 0.000 claims abstract description 30
- 239000007788 liquid Substances 0.000 claims abstract description 30
- 239000012159 carrier gas Substances 0.000 claims abstract description 26
- 238000010438 heat treatment Methods 0.000 claims abstract description 9
- -1 humidifying pot Substances 0.000 claims description 2
- 238000011160 research Methods 0.000 abstract description 4
- 239000002957 persistent organic pollutant Substances 0.000 abstract description 3
- 239000000126 substance Substances 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 10
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 6
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 6
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 6
- 239000003344 environmental pollutant Substances 0.000 description 5
- 231100000719 pollutant Toxicity 0.000 description 5
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- 238000004887 air purification Methods 0.000 description 3
- 239000003085 diluting agent Substances 0.000 description 3
- 239000012895 dilution Substances 0.000 description 3
- 238000010790 dilution Methods 0.000 description 3
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- IKHGUXGNUITLKF-XPULMUKRSA-N acetaldehyde Chemical compound [14CH]([14CH3])=O IKHGUXGNUITLKF-XPULMUKRSA-N 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000001307 helium Substances 0.000 description 2
- 229910052734 helium Inorganic materials 0.000 description 2
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 2
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 2
- WSFSSNUMVMOOMR-NJFSPNSNSA-N methanone Chemical compound O=[14CH2] WSFSSNUMVMOOMR-NJFSPNSNSA-N 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 239000012855 volatile organic compound Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910004013 NO 2 Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000002513 implantation Methods 0.000 description 1
- 239000011259 mixed solution Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000002572 peristaltic effect Effects 0.000 description 1
- 230000001699 photocatalysis Effects 0.000 description 1
- 238000007146 photocatalysis Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- 239000003039 volatile agent Substances 0.000 description 1
Images
Landscapes
- Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
Abstract
The invention relates to a dynamic generator for multicomponent low-concentration standard gas, and belongs to the field of the generation of standard gas. According to the dynamic generator, a carrier gas source outlet is connected with a humidification tank by a pipeline; the humidification tank is connected in parallel at the inlet end and the outlet end of a bypass valve; a microporous humidification head is arranged in the humidification tank and is connected with the outlet end of a first flow controller and the inlet end of the bypass valve simultaneously by the pipeline; a polluted gas source is connected with a gas collector by the pipeline, and a flow controller is arranged on the connected pipeline for connecting the polluted gas source and the gas collector; a capillary sprayer is arranged in the gas collector; a liquid injection pump is connected with the capillary sprayer in the gas collector; and a constant temperature heating sleeve is wrapped outside the gas collector. According to the dynamic generator, due to the adoption of a mode of the liquid injection pump, the proportioning of multiple organic pollutants is realized simply and accurately, and the multicomponent low-concentration standard gas with the concentration ranging from 0.01 to 20 mg/m<3> can be generated simultaneously. The dynamic generator can be applied to multiple fields of scientific research, environment, chemistry, chemicals and the like.
Description
Technical field
The present invention relates to the dynamic generating means of a kind of multicomponent low concentration calibrating gas, belong to calibrating gas field occurs.
Background technology
Indoor air quality significantly affects people's comfortable, health and operating efficiency, more and more receives people's concern.And organic volatile compound (VOCs) excessive concentration that indoor article and decoration material discharge is the one of the main reasons that causes indoor air quality inferior.For guaranteeing the indoor environment of safety and comfort, many material for air purification are widely used in indoor environment, such as active carbon adsorption material, nanometer titanium dioxide photocatalysis material, room temperature thermocatalytic material etc.Therefore the performance that detects these material for air purification is very important.General detection method is the dusty gas that first configures constant density, then via the purifying part that contains these material for air purification, assesses the performance of these materials by monitoring purifying part exit concentration.How simultaneously its difficult point is the dusty gas of constant generation multicomponent low concentration.
Conventional method is with gas bottle, to produce the dusty gas of steady concentration at present, but its shortcoming is to be difficult to maintain long experiment, for example reaches the adsorption penetration experiment of 1 week; In addition, change gas bottle, concentration occurs for it all needs the long period just can reach stable at every turn; And when needing the multiple dusty gas of research to have the clean-up effect in situation, often need to configure a plurality of gas bottles and a plurality of mass flow controller simultaneously, and system complex not only, and expensive, greatly increased experimental cost.China State Standard Matter Research Centre has developed anemostat calibrating gas and dynamic air-distributing device thereof, this device is based on anemostat or osmos tube principle, when there is multiple dusty gas in need, need a plurality of anemostats of configuration or osmos tube, expensive, and also the dusty gas of each anemostat or osmos tube generation speed is fixed, when changing, need produce speed, need to purchase new anemostat or osmos tube, not only increased experimental cost, but also be difficult to dynamic adjustments.In addition, also can adjust produced gas concentration by the mode of dilution, but when the calibrating gas of configuration low concentration, the relative carrier gas of amount of diluent gas is sizable.In the situation that the amount of diluent gas is much larger than carrier gas, the concentration that changes final gained composite pollution gas by changing the amount of diluent gas is unusual poor efficiency, has also introduced dilution error simultaneously, to dilution flow rate control require harsh.
Summary of the invention
The object of the invention is to propose the dynamic generating means of a kind of multicomponent low concentration calibrating gas, to overcome the deficiency of the dynamic method for generation of existing dusty gas, cost is low, precision highland utilizes liquid injection pump to produce 0.01～20mg/m
3the multicomponent light concentration gas of concentration range, the multicomponent low concentration calibrating gas of acquisition desired concn.
The dynamic generating means of multicomponent light concentration gas that the present invention proposes, comprising: carrier gas source of the gas, dusty gas source of the gas, humidifying pot, liquid injection pump, gas collector, constant-temperature heating sleeve, micropore humidification head, capillary shower nozzle and by-passing valve; Described carrier gas source of the gas outlet is connected with humidifying pot by pipeline, and the pipeline that carrier gas source of the gas is connected with humidifying pot is provided with first flow controller and by-passing valve, and humidifying pot is connected in parallel on entrance point and the port of export of by-passing valve; Described micropore humidification head is placed in humidifying pot, and micropore humidification head is connected with the port of export of first flow controller and the entrance point of by-passing valve by pipeline simultaneously; The port of export of by-passing valve is connected with gas collector; Described dusty gas source of the gas is connected with gas collector by pipeline, and the pipeline that dusty gas source of the gas is connected with gas collector is provided with second amount controller; Described capillary shower nozzle is placed in gas collector; Described liquid injection pump is connected with the capillary shower nozzle in gas collector by pipeline; Described constant-temperature heating sleeve is wrapped in the outside of gas collector; Gas collector is provided with multicomponent low concentration calibrating gas.
The dynamic generating means of multicomponent low concentration calibrating gas that the present invention proposes, the characteristic that can mutually dissolve each other according to indoor organic pollutant, adopt the mode of liquid injection pump, simply, accurately realize the proportioning of Some Organic Pollutants, and by capillary shower nozzle, inject air distribution system by liquid injection pump, due to injection rate very little (being about 0.01nL/min), can in the gas collector of air distribution system, evaporate into rapidly gas.Liquid injection pump can be controlled different liquid charge velocities by control program able to programme, can in experimentation, change at any time, thereby realize according to the generation of experimental result rapid adjustment variable concentrations.Gas-dynamic generating means of the present invention can produce 0.01～20mg/m simultaneously
3the multicomponent low concentration calibrating gas of concentration range.Apparatus of the present invention can be applicable to a plurality of fields such as scientific research, environment, chemistry, chemical industry.
Accompanying drawing explanation
Fig. 1 is the structural representation of the dynamic generating means of multicomponent light concentration gas of proposition of the present invention.
Fig. 2 is the structural representation of the capillary shower nozzle that uses in apparatus of the present invention.
In Fig. 1, the 1st, carrier gas source of the gas, the 2nd, first flow controller, the 3rd, humidifying pot, the 4th, micropore humidification head, the 5th, by-passing valve, the 6th, dusty gas source of the gas, the 7th, second amount controller, the 8th, liquid injection pump, the 9th, gas collector, the 10th, capillary shower nozzle, the 11st, constant-temperature heating sleeve, the 12nd, the outlet of multicomponent low concentration calibrating gas.
The specific embodiment
The dynamic generating means of multicomponent light concentration gas that the present invention proposes, its structure as shown in Figure 1, comprising: carrier gas source of the gas 1, dusty gas source of the gas 6, humidifying pot 3, liquid injection pump 8, gas collector 9, constant-temperature heating sleeve 11, micropore humidification head 4, capillary shower nozzle 10 and by-passing valve 5.The outlet of carrier gas source of the gas 1 is connected with humidifying pot 3 by pipeline, and the pipeline that carrier gas source of the gas 1 is connected with humidifying pot 3 is provided with first flow controller 2 and by-passing valve 5, and humidifying pot 3 is connected in parallel on entrance point and the port of export of by-passing valve 5.Micropore humidification head 4 is placed in humidifying pot 3, and micropore humidification head 4 is connected with the entrance point of by-passing valve 5 with the port of export of first flow controller 2 by pipeline simultaneously; The port of export of by-passing valve 5 is connected with gas collector 9.Dusty gas source of the gas 6 is connected with gas collector 9 by pipeline, and the pipeline that dusty gas source of the gas 6 is connected with gas collector 9 is provided with second amount controller 7.Capillary shower nozzle 10 is placed in gas collector 9.Liquid injection pump 8 is connected with the capillary shower nozzle 10 in gas collector 9 by pipeline.Constant-temperature heating sleeve 11 is wrapped in the outside of gas collector 9; Gas collector 9 is provided with the outlet of multicomponent low concentration calibrating gas.
The dynamic generating means of multicomponent light concentration gas that the present invention proposes, can be divided into carrier gas system, gas injection system, liquid injection system and four parts of gas gathering system.Carrier gas system is comprised of carrier gas source of the gas (high-pure helium or compressed air), flow controller and humidifying pot; Gas injection system is the pollutant of gas for occurring under normal temperature, as hydrogen sulfide, ammonia etc.Similar to carrier gas system, carrier gas system is comprised of dusty gas source of the gas (gas bottle) and flow controller; Liquid injection system is for to occur under normal temperature be the pollutant of liquid, as indoor common most of VOC: toluene, benzene, dimethylbenzene, formaldehyde, acetaldehyde, acetone etc.Liquid injection pump is by the controlled gas collector 9 of multiple pollutant mixed solution process capillary shower nozzle 10 implantation temperatures, and evaporate into fast gas, then the air-flow producing with carrier gas system and gas injection system mixes, by carrier gas, carry pollutant again and flow out gas collector, thereby obtain the multicomponent low concentration calibrating gas of desired concn.
In apparatus of the present invention, can adopt capillary shower nozzle as shown in Figure 2, one end diameter of capillary shower nozzle is larger, and the diameter of the other end is less, and this is atomized compared with small end ejection from the diameter of capillary shower nozzle from the gases at high pressure of liquid peristaltic pump with regard to making.
In an embodiment of apparatus of the present invention, the first and second flow controllers, can use the product that produce, that model is M-5SLPM-D by Alicat Science company; Liquid injection pump wherein can use the product by Longer company produces, model is LSP01-2A.
Below in conjunction with accompanying drawing, describe the course of work of gas-dynamic generating means of the present invention in detail:
In carrier gas system, carrier gas is flowed out from source of the gas 1, by flow controller 2, is then divided into two-way, one road flows into humidifying pot 3, by micropore, add wet joint 4 tiny bubble occurs, and by-passing valve 5 is flow through as bypass gases in another road, last two-way air-flow collects in gas collector 9.This system is 0～80% and the range of flow carrier gas that is 0.5～5L/min for generation of humidity range.In gas injection system, dusty gas flows out from source of the gas 6, by flow controller 7, flows in gas collector 9.This system is for generation of being the pollutant of gaseous state under the normal temperature of constant density.In liquid injection system, by liquid injection pump 8 under the effect of capillary shower nozzle 10, form with fine spray is injected gas collector 9 by the fluid contaminants of certain proportioning, due to gas collector 9 outer wrapping constant-temperature heating sleeves (control gas collector in temperature be 65 ± 0.5 ℃), being sprayed at of spraying evaporates into rapidly gas under high temperature action.
Liquid injection pump in apparatus of the present invention, can control different liquid charge velocities by control program able to programme, can in experimentation, change at any time, thereby realize according to the generation of experimental result rapid adjustment variable concentrations.By changing different syringes, can realize range of flow is the liquid injection rate of 0.01nL/min～0.1 μ L/min, and when carrier gas flux is 1L/min, generation concentration range is 0.01～20mg/m
3.
Utilize gas-dynamic generating means of the present invention, can produce 0.01～20mg/m
3the multicomponent low concentration calibrating gas of concentration range, comprises hydrogen sulfide, ammonia, CO, NO
2deng the material that is gaseous state, and be the material of liquid under the normal temperature such as toluene, benzene, dimethylbenzene, formaldehyde, acetaldehyde, acetone under normal temperature.
Apparatus of the present invention add wet joint by micropore, and humidity range can occur is 0～80%, and the range of flow carrier gas that is 0.5～5L/min.Described carrier gas can be high-purity helium or compressed air.The liquid injection pump that apparatus of the present invention adopt, liquid injection rate is 0.01nL/min～0.1 μ L/min, and is operated by control program able to programme, can in experimentation, change at any time.The specification of syringe that described liquid injection pump is selected can be 1～50 μ L.This device is by being used capillary shower nozzle, and the liquid injection rate that makes 0.01nL/min～0.1 μ L/min is volatilization fast in the gas collector of 65 ± 0.5 ℃ in temperature.
Claims (1)
1. the dynamic generating means of multicomponent light concentration gas, is characterized in that this gas-dynamic generating means comprises: carrier gas source of the gas, dusty gas source of the gas, humidifying pot, liquid injection pump, gas collector, constant-temperature heating sleeve, micropore humidification head, capillary shower nozzle and by-passing valve; Described carrier gas source of the gas outlet is connected with humidifying pot by pipeline, and the pipeline that carrier gas source of the gas is connected with humidifying pot is provided with first flow controller and by-passing valve, and humidifying pot is connected in parallel on entrance point and the port of export of by-passing valve; Described micropore humidification head is placed in humidifying pot, and micropore humidification head is connected with the port of export of first flow controller and the entrance point of by-passing valve by pipeline simultaneously; The port of export of by-passing valve is connected with gas collector; Described dusty gas source of the gas is connected with gas collector by pipeline, and the pipeline that dusty gas source of the gas is connected with gas collector is provided with second amount controller; Described capillary shower nozzle is placed in gas collector; Described liquid injection pump is connected with the capillary shower nozzle in gas collector by pipeline; Described constant-temperature heating sleeve is wrapped in the outside of gas collector; Gas collector is provided with the outlet of multicomponent low concentration calibrating gas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210073801.1A CN102614803B (en) | 2012-03-20 | 2012-03-20 | Dynamic generator for multicomponent low-concentration standard gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210073801.1A CN102614803B (en) | 2012-03-20 | 2012-03-20 | Dynamic generator for multicomponent low-concentration standard gas |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102614803A CN102614803A (en) | 2012-08-01 |
| CN102614803B true CN102614803B (en) | 2014-01-29 |
Family
ID=46555218
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210073801.1A Active CN102614803B (en) | 2012-03-20 | 2012-03-20 | Dynamic generator for multicomponent low-concentration standard gas |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102614803B (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104390831A (en) * | 2014-12-16 | 2015-03-04 | 山东大学 | Method and device for preparing standard methacrylic acid gas sample |
| CN105536587A (en) * | 2015-12-25 | 2016-05-04 | 南京信息工程大学 | Standard gas dynamic mixing instrument |
| CN105664510A (en) * | 2016-02-26 | 2016-06-15 | 天津大学建筑设计研究院 | Evaporation chamber of gaseous organic pollutant generator |
| CN106237877B (en) * | 2016-09-28 | 2019-05-17 | 北京明尼特环保设备有限公司 | A kind of dynamic gas-liquid mixed distributing instrument |
| CN107228923B (en) * | 2017-06-27 | 2024-04-05 | 中国科学院化学研究所 | Preparation method and generation system of standard gaseous nitrous acid |
| CN110389092A (en) * | 2018-04-19 | 2019-10-29 | 北京凯隆分析仪器有限公司 | Micro dust generation, dust measurement instrument method for testing performance and device |
| CN108593848A (en) * | 2018-04-25 | 2018-09-28 | 清华大学深圳研究生院 | A kind of normal concentration sample gas generation device and production method |
| CN108518747A (en) * | 2018-06-21 | 2018-09-11 | 天津大学 | A kind of mixing pernicious gas removal experimental system |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7390346B2 (en) * | 2005-05-12 | 2008-06-24 | Praxair Technology, Inc. | System and apparatus for producing primary standard gas mixtures |
| CN2929723Y (en) * | 2006-07-27 | 2007-08-01 | 中国计量科学研究院 | Dynamic gas distributor for multiple component expansion tube standard gases |
| CN101357305B (en) * | 2008-09-02 | 2010-08-18 | 浙江大学 | Preparation device and method of low-concentration gas of certain humidity |
| CN102258958B (en) * | 2011-05-27 | 2014-07-23 | 中国计量科学研究院 | Dynamic gas distributing system for standard gas |
-
2012
- 2012-03-20 CN CN201210073801.1A patent/CN102614803B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN102614803A (en) | 2012-08-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102614803B (en) | Dynamic generator for multicomponent low-concentration standard gas | |
| Rostami et al. | Experimental study on the effects of an ionic liquid for CO2 capture using hollow fiber membrane contactors | |
| CN103382623B (en) | The electrostatic spinning preparation method of manganese dioxide/polyacrylonitrile-radical oxidation Decomposition formaldehyde type nano fibrous membrane | |
| CN106587125A (en) | Preparation method for light calcium carbonate | |
| CN203935765U (en) | A kind of flue gas purification system of integrated desulfurizing denitration | |
| Karami et al. | Analysis of ammonia separation from purge gases in microporous hollow fiber membrane contactors | |
| CN102600741B (en) | Low-concentration multi-component standard gas generating device for evaluating performance of air flue purifying component | |
| Xue et al. | Investigation of membrane wetting for CO2 capture by gas–liquid contactor based on ceramic membrane | |
| CN106310892B (en) | A kind of spraying exhaust treatment system and its application | |
| CN205965456U (en) | Organic waste gas integrated treating equipment | |
| CN102861545B (en) | Ultraviolet photocatalytic micro-reaction chip system based on titanium dioxide nano fibers | |
| CN204933190U (en) | A kind of compound organic exhaust gas adsorption-desorption recovery system | |
| JPH11128704A (en) | Regulator and regulating method for regulating dissolved gas concentration in solution | |
| FI20050595A (en) | Method and apparatus for producing nanoparticles | |
| CN105879574B (en) | A kind of VOCs concentration load buffer regulating device | |
| CN101284656B (en) | Nitric oxide gas generating unit and preparing process | |
| CN105797549A (en) | Single-fluid automated waste gas treatment method | |
| CN203448004U (en) | Gas mixing device suitable for low pressure gases | |
| GB2506689A (en) | Air pollution control apparatus and method of use | |
| CN202741000U (en) | Biotrickling filter denitrating tower | |
| CN204116063U (en) | A kind of gaseous organic pollutant generator for air strainer test macro | |
| CN205288072U (en) | Denitration agent is diluted and is mixed measurement assigned unit | |
| Xin et al. | High-performance electrospun polystyrene-based nanofiber membrane for efficient SO2 capture | |
| CN206560785U (en) | The micro-nano ozone emission-reducing system of waste gas | |
| CN206404929U (en) | A kind of equipment of on-line tuning spray angle of nozzle |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |