CN202052481U - Hydrazine propellant standard gas generator - Google Patents
Hydrazine propellant standard gas generator Download PDFInfo
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- CN202052481U CN202052481U CN2010201754821U CN201020175482U CN202052481U CN 202052481 U CN202052481 U CN 202052481U CN 2010201754821 U CN2010201754821 U CN 2010201754821U CN 201020175482 U CN201020175482 U CN 201020175482U CN 202052481 U CN202052481 U CN 202052481U
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- hydrazine
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Abstract
The utility model relates to a hydrazine propellant standard gas generator, which comprises a dilution gas source, a hydrazine gas source and a mixing chamber (2), wherein the dilution gas source is connected with one end of the mixing chamber (2) through a mass flow meter, so the dilution gas is quantificationally input into the mixing chamber (2), the hydrazine gas source comprises a trace injection pump (4), a trace injector (5) and a vaporization chamber (6), the trace injector (5) contains hydrazine propellant liquid, the vaporization chamber (6) is connected with the trace injector (5), and in addition, the trace injector (5) enters the vaporization chamber (6) in a vertical mode, so the trace injection pump (4) carries out precise control on the flow rate of the trace injector (5), and the hydrazine propellant liquid can be quantificationally injected into the vaporization chamber (6) to be immediately vaporized. The dilution gas source is connected with the vaporization chamber (6) through the mass flow meter, simultaneously, the vaporization chamber (6) is connected with the mixing chamber (2), and the connecting position is the same end of the mixing chamber (2), so carrier gas is quantificationally input into the vaporization chamber (6) through the mass flow meter to be mixed with the vaporized hydrazine gas through and brings the hydrazine gas into the mixing chamber (2). A single-hole air distribution plate (8) and a porous air distribution plate (9) are arranged in the mixing chamber (2), so the gas entering the mixing chamber (2) is uniformly mixed.
Description
Technical field
The present invention relates to a kind of standard gas generating apparatus, particularly relate to the dynamic generating means of a kind of hydrazine class propellant calibrating gas.
Background technology
Preparation method according to calibrating gas can be divided into static method and dynamic method.Static distribution is that two kinds of gas pressing forces or volume ratio are charged into container simultaneously, after placing a period of time, freely-movable through two kinds of gas molecules is spread fully, and to reach the purpose of mixing, the calibrating gas of preparation is packaged in high pressure or the pressurizing vessel more.Dynamic air-distributing is meant that two or more gas just mixes the flow process of pipeline from source of the gas, and the mixing that promptly reaches specific is when stable exporting.Though dynamic method on equipment than the static method complexity, but its air distributing method and equipment are in case set up, just can obtain the calibrating gas of various constant densities easily, because gas continuous-flow, finally can reach balance, avoid static method unsettled shortcomings of distribution concentration such as the absorption of microcomponent and reactions.The former is applicable to the preparation gas standard material that chemical property is more stable, concentration ratio is higher; The latter then not only can be used for preparing the more stable gas standard material of chemical property, also can be used for preparing the gas standard material that chemical property is active, concentration is low.Hydrazine class propellant gas has characteristics such as easy oxidation Decomposition, adsorptivity be strong, as adopt the static method distribution, between container and the object gas wall effects such as physical absorption and chemical reaction can take place, prepare low concentration hydrazine class standard gas both at home and abroad and adopt osmos tube dynamic air-distributing method more.The Kin-Tek series precision standard gas generating system of the U.S. adopts osmos tube dynamic air-distributing method preparation hydrazine class gas, and the three hydrazine calibrating gas of 0.01ppm-2ppm (V/V) can take place.The hydrazine class propellant mark dynamic air-distributing device that Aerospace Science and Technology Corporation 101 is developed also adopts with the preparation of osmos tube dynamic air-distributing method, and the air distributing device uncertainty is 8%.Low concentration hydrazine class propellant calibrating gas (2ppm is following) can only take place in osmos tube dynamic air-distributing subtraction unit, only be fit to the detection alarm instrument that calibration and calibrating are used to detect trace hydrazine class propellant, can not calibrate and examine and determine the hydrazine class propellant detection alarm instrument with relatively large journey scope (general 0-100ppm) that is used to hunt leak.Osmos tube costs an arm and a leg in addition, supplies limitedly, and has certain use to imitate the phase, thereby has also limited it and promoted the use of.People such as Zhang Guangyou are in " design of hydrazine class dynamic standard gas generating unit " (" Shanghai space flight ", 2003 the 1st phases, the the 53rd to 55 page) in a kind of " hydrazine class dynamic standard gas generating unit " disclosed, can prepare the hydrazine class propellant gas of 0-100ppm, but owing to have defective in the design, this device stability is relatively poor, uncertainty higher (being about 20%), calibrating gas concentration needs to use the chemical analysis method definite value behind the spot sampling, therefore can only use as hydrazine class gas generating unit, the calibrating gas of desired concn can not controllably take place; The following light concentration gas of this device preparation 0.01ppm-5ppm is difficult to realize in addition.
Summary of the invention
The objective of the invention is to overcome the above-mentioned shortcoming of prior art, by redesigning a kind of hydrazine class propellant dynamic air-distributing device, hydrazine class propellant calibrating gas in the 0.01ppm-100ppm scope can be accurately controllably made, or even the preparation of gas can be realized by computer control.
The present invention includes following content:
1. hydrazine class propellant standard gas generating apparatus, it comprises source of diluent gas, hydrazine class gas source and mixing chamber 2, wherein,
Source of diluent gas links to each other with an end of mixing chamber 2 by mass flowmenter 3, thereby feasiblely can carry out following operation: diluent gas is input in the mixing chamber 2 quantitatively;
Hydrazine class gas source comprises micro-injection pump 4 and the micro syringe 5 of hydrazine class propellant liquid is housed, and the vaporizer 6 that links to each other with micro syringe 5, and micro syringe 5 adopts vertical mode to enter in the vaporizer 6, thereby make and can carry out following operation: the flow velocity of 4 pairs of micro syringes 5 of micro-injection pump carries out precision control, is expelled to instantaneous vaporization in the vaporizer 6 with making hydrazine class propellant liquid quantitative;
Source of diluent gas links to each other with vaporizer 6 by mass flowmenter 7, vaporizer 6 links to each other with mixing chamber 2 simultaneously, the position that links to each other is the same end of above-described mixing chamber 2, thereby make and can carry out following operation: carrier gas is input to quantitatively in the vaporizer 6 by mass flowmenter and mixes with the hydrazine class gas of vaporization, and hydrazine class gas brought in the mixing chamber 2
Single hole air distribution plate 8 and perforated distributor 9 are arranged in the mixing chamber 2, thereby make and can carry out following operation: the gas that will enter into mixing chamber 2 evenly mixes.Wherein preferred single hole air distribution plate 8 and perforated distributor 9 alternately are arranged in the mixing chamber 2.
2. the 1st hydrazine class propellant standard gas generating apparatus, wherein all connecting pipe and the inwall of air chamber are made by polytetrafluoroethylmaterial material in this device.
3. aforementioned each hydrazine class propellant standard gas generating apparatus, wherein the other end of mixing chamber 2 is connected to following one or more: alarm detects mouthfuls 10, test port 11 and evacuation port 12.
4. aforementioned each hydrazine class propellant standard gas generating apparatus, wherein vaporizer (6) places the flat-temperature zone of temperature adjustable.The temperature of flat-temperature zone can be for example 20 ℃, 30 ℃ etc.
5. aforementioned each hydrazine class propellant standard gas generating apparatus, the micro syringe 5 that can replace wherein is installed in the micro-injection pump 4, the following calibrating gas of preparation 20ppm 100uL micro syringe 5, the above calibrating gas of 20ppm uses 500 μ L micro syringes 5.Also can use a plurality of from different or identical micro syringe 5.
6. aforementioned each hydrazine class propellant standard gas generating apparatus, wherein said mass flowmenter 3 and 7, vaporizer 6 and micro-injection pump 4 link to each other with the microcomputer that can carry out accurate control, thereby make and to carry out following operation: adopt microcomputer measuring and controlling technology accurate control mass flowmenter 3 and 7 bypass flow, the temperature of vaporizer 6 and the injection speed of micro-injection pump 4, be lower than 10% with the uncertainty that guarantees institute's preparing calibrating gas.
7. aforementioned each hydrazine class propellant standard gas generating apparatus wherein adopts PID temperature control principle that temperature in the vaporizer 6 are directly controlled.
The present invention has solved the problems referred to above well, and has following technique effect:
(1) micro syringe of the present invention adopts vertical mode to inject vaporizer, can prevent the formation of bubble in the syringe cavity;
(2) with PID temperature control principle the vaporization indoor temperature is directly controlled, the temperature by the control vaporizer makes the instantaneous vaporization of drop of injection, makes it possible to the vaporization effect that reaches more satisfactory;
(3) be provided with two kinds of air distribution plates in the mixing chamber, wherein a kind of is the single hole air distribution plate, and another kind is a perforated distributor.Two kinds of air distribution plates preferably are arranged alternately in mixing chamber, and it is the resistance that increases gas flow that main effect is set, and makes gas molecule collide mixing repeatedly at the cavity of mixing chamber, has reached the effect of hydrazine class gas mixing;
(4) the dilution source of the gas links to each other with vaporizer with gas mixer chamber respectively after shunting by a high-precision mass flowmenter, and the low concentration gas that is low to moderate 0.01ppm most can be prepared by the secondary dilution in hydrazine class propellant liquid evaporation back.
(5) vaporizer places between the flat-temperature zone of an accurate control temperature, helps the stable of gas.
(6) inwall of the pipeline of all contact hydrazine class gases of described hydrazine class propellant standard gas generating apparatus and air chamber is polytetrafluoroethylene (PTFE) etc. and does not make with the material that the gas of preparation reacts, to reduce to prepare wall effects such as physical absorption between gas and the tube wall and chemical reaction.
(7) hydrazine class propellant standard gas generating apparatus of the present invention can be with the hydrazine class propellant calibrating gas of any concentration in lower uncertainty preparation 0.01 * ppm-100 * ppm scope, and wherein uncertainty is generally less than 10%.
Description of drawings
Description of drawings one embodiment of the present invention.In the drawings, identical Reference numeral is represented identical parts.
Fig. 1 is the gas circuit structure schematic diagram of one embodiment of the present invention.
Reference numeral among Fig. 1 has following implication:
1 nitrogen inlet
2 mixing chambers
3 mass flowmenters
4 micro-injection pumps
5 micro syringes
6 vaporizers
7 mass flowmenters
8 single hole air distribution plates
9 perforated distributors
10 alarms detect mouth
11 test ports
12 evacuation ports
13 flow control valve groups
14 spinner flowmeters
The specific embodiment
The invention will be described further below in conjunction with the specific embodiment of accompanying drawing, should be appreciated that these descriptions all are illustrative, the invention is not restricted to this.Scope of the present invention is only limited by the scope of claims.
Fig. 1 is the schematic diagram of one embodiment of the present invention.Hydrazine class propellant standard gas generating apparatus as shown in fig. 1 comprises source of diluent gas, hydrazine class gas source and mixing chamber 2, wherein, source of diluent gas links to each other with an end of mixing chamber 2 by mass flowmenter 3, thereby makes diluent gas be input to quantitatively in the mixing chamber 2; Hydrazine class gas source comprises micro-injection pump 4 and the micro syringe 5 of hydrazine class propellant liquid is housed, and the vaporizer 6 that links to each other with micro syringe 5 is formed, and micro syringe 5 adopts vertical mode to enter in the vaporizer 6, thereby make the flow velocity of 4 pairs of micro syringes 5 of micro-injection pump control, be expelled to vaporization in the vaporizer 6 with making hydrazine class gasometry; Source of diluent gas links to each other with vaporizer 6 by mass flowmenter, vaporizer 6 links to each other with mixing chamber 2 simultaneously, the position that links to each other is the same end of above-described mixing chamber 2, mix with the hydrazine class gas of vaporization thereby make carrier gas be input to quantitatively in the vaporizer 6, and hydrazine class gas is brought in the mixing chamber 2 by mass flowmenter; Single hole air distribution plate 8 and perforated distributor 9 are arranged in the mixing chamber 2, thereby make the gas that enters into mixing chamber 2 evenly mix by air distribution plate.Among the figure, mixing chamber 2 also is connected to alarm and detects mouth 10, test port 11 and evacuation port 12.Mixing chamber 2 and alarm detect between the mouth 10 and are provided with flowmeter.Be provided with flow control valve between mixing chamber 2 and the evacuation port 12.By regulating the flow of three flow control valve controllable flow amount meters, constant with the gas flow that guarantees alarm detection mouth 10.
Mass flowmenter among the figure, micro-injection pump 4 and vaporizer 6 temperature are all passed through the control of microcomputer control device (not shown), thereby the uncertainty that guarantees institute's preparing calibrating gas is lower than 10%.
Further, in this hydrazine class propellant standard gas generating apparatus, diluent gas is a nitrogen.The described diluent gas shunting back that is gone out by the carrier gas source and course links to each other with mixing chamber 2 with vaporizer respectively by two mass flowmenters.Temperature controlling range is 0～40 ℃ in the described vaporizer.Micro-injection pump 4 can carry out continuous control to the flow velocity of micro syringe 5.The injection speed speed of the temperature of the flow of described two mass flowmenters, vaporizer 6 and micro-injection pump 4 is by computer measurement and control.Described alarm detects mouthfuls 10 and links to each other with a spinner flowmeter.Described nitrogen is handled through dehumidifying purifying and voltage stabilizing; All pipelines of described device and air chamber material are polytetrafluoroethylmaterial material and make.
Be that example briefly explains the hydrazine class propellant standard gas generating apparatus operation principle (compound method) among the figure with space launching site uns-dimethylhydrazine commonly used now: at first open dilution source of the gas (nitrogen inlet 1), the flow of regulating the mass flowmenter that is connected to vaporizer 6 and mixing chamber 2 respectively reaches setting value; The temperature of regulating vaporizer 6 reaches design temperature; Suck the uns-dimethylhydrazine mother liquor that a certain amount of distillation was handled by micro syringe 5, the emptying air is vertically mounted on it on vaporizer; Start micro-injection pump 4, with the uns-dimethylhydrazine mother liquor with in the continuous injecting gas vaporization chamber of setting speed, the uns-dimethylhydrazine mother liquor is in the steam raising of syringe needle point place, flowing into gas mixer chamber 2 under the carrying that feeds vaporizer 6 carrier gas mixes, mist flows out the back from mixing chamber 2 and arrives test port 11 and alarm detection mouth 10, unnecessary gas is discharged via the evacuation port 12 of output interface, and test port 11 and alarm detect mouthful gas of 10 outputs and be the certain density calibrating gas of being prepared.As change concentration, and can prepare the uns-dimethylhydrazine calibrating gas of variable concentrations by the mode that changes diluting gas flow or uns-dimethylhydrazine mother liquor injection speed, when concentration changes greatly, can change employed micro syringe 5 simultaneously as required.The present invention can prepare hydrazine class propellant calibrating gas in the relative broad range automatically, has advantages such as easy to use and practical.
Hydrazine class propellant of the present invention mainly comprises the high and inflammable and explosive material of toxicity such as anhydrous hydrazine, methyl hydrazine and uns-dimethylhydrazine.Because hydrazine class propellant standard gas generating apparatus of the present invention can be used for preparing NH equally
3, HCN etc. is difficult to the standard gas sample with static distribution method preparation, so hydrazine class gas of the present invention in fact also comprises NH
3, all available hydrazine class propellant standard gas generating apparatus preparation standard gases of the present invention such as HCN other gas.
Embodiment
Confirm that below by actual several times preparation data hydrazine class propellant standard gas generating apparatus of the present invention is at the excellent properties aspect the preparing calibrating gas.
The applicant has carried out the experiment of calibrating gas preparation several times with described device of accompanying drawing and the described method of specification, and result data is as shown in table 1.
Table 1
| Embodiment 1 | |
|
Embodiment 4 | |
|
| Aimed concn | 0.01ppm | 0.1ppm | ?1ppm | ?10ppm | ?100ppm |
| Compound concentration | 0.019ppm | 0.17ppm | 1.6ppm | 11.2ppm | 92.8ppm |
| Relative standard deviation | 8.4％ | 6.5％ | 5.8％ | 4.2％ | 6.9％ |
Can find out that from last table hydrazine class propellant standard gas generating apparatus of the present invention can produce required calibrating gas with low relative standard deviation.
Below content of the present invention is elaborated, those skilled in the art can realize the present invention after having understood the disclosed content of the application.For persons skilled in the art, any conspicuous change that it is done without departing from the premise in the spirit of the present invention, perhaps the direct replacement of customary means all constitutes the infringement to patent of the present invention, with corresponding legal responsibilities.
Claims (6)
1. hydrazine class propellant standard gas generating apparatus, it comprises source of diluent gas, hydrazine class gas source and mixing chamber (2), wherein,
Source of diluent gas links to each other with an end of mixing chamber (2) by mass flowmenter (3);
Hydrazine class gas source comprises micro-injection pump (4) and the micro syringe (5) of hydrazine class propellant liquid is housed, and the vaporizer (6) that links to each other with micro syringe (5), and micro syringe (5) adopts vertical mode to enter in the vaporizer (6);
Source of diluent gas links to each other with vaporizer (6) by mass flowmenter (7), and vaporizer (6) links to each other with mixing chamber (2) simultaneously, and the position that links to each other is the same end of above-described mixing chamber (2);
Single hole air distribution plate (8) and perforated distributor (9) are arranged in the mixing chamber (2).
2. hydrazine class propellant standard gas generating apparatus according to claim 1 is characterized in that: all connecting pipe and the inwall of air chamber are made by polytetrafluoroethylmaterial material in this device.
3. hydrazine class propellant standard gas generating apparatus according to claim 1, the other end that it is characterized in that mixing chamber (2) are connected to one or more with lower interface: alarm detects mouthful (10), test port (11) and evacuation port (12).
4. hydrazine class propellant standard gas generating apparatus according to claim 1 is characterized in that vaporizer (6) places the flat-temperature zone of temperature adjustable.
5. hydrazine class propellant standard gas generating apparatus according to claim 1, it is characterized in that being equipped with in the micro-injection pump (4) micro syringe (5) that can replace, the following calibrating gas of preparation 20ppm 100uL micro syringe (5), the above calibrating gas of 20ppm uses 500 μ L micro syringes (5).
6. hydrazine class propellant standard gas generating apparatus according to claim 1 is characterized in that: mass flowmenter (3,7), vaporizer (6) and micro-injection pump (4) link to each other with the microcomputer that can carry out accurate control.
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| CN2010201754821U CN202052481U (en) | 2010-04-30 | 2010-04-30 | Hydrazine propellant standard gas generator |
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| CN2010201754821U CN202052481U (en) | 2010-04-30 | 2010-04-30 | Hydrazine propellant standard gas generator |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103331125A (en) * | 2013-07-23 | 2013-10-02 | 重庆大学 | High-precision gas distribution instrument |
| CN105536587A (en) * | 2015-12-25 | 2016-05-04 | 南京信息工程大学 | Standard gas dynamic mixing instrument |
| CN106268493A (en) * | 2016-08-19 | 2017-01-04 | 北京艾立特科技有限公司 | A kind of liquid dynamic air-distributing device and air distributing method thereof |
| CN106457168A (en) * | 2014-05-09 | 2017-02-22 | 艾克斯特朗欧洲公司 | Device and method for providing a process gas mixture to a cvd or pvd coating device |
| CN109283036A (en) * | 2018-08-28 | 2019-01-29 | 南京天博环境检测技术有限公司 | A kind of portable gas pollutant dilution device |
| CN109708943A (en) * | 2019-02-28 | 2019-05-03 | 山东非金属材料研究所 | The preparation method of bromo-trichloromethane gas reference material in a kind of nitrogen |
| CN110142161A (en) * | 2019-05-30 | 2019-08-20 | 上海理工大学 | Aromatic liquid hydrocarbon compound is continuously atomized and stablizes generating device and method |
| CN111715086A (en) * | 2020-06-12 | 2020-09-29 | 上海交通大学 | Cavity for premixing multiple gases |
-
2010
- 2010-04-30 CN CN2010201754821U patent/CN202052481U/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103331125A (en) * | 2013-07-23 | 2013-10-02 | 重庆大学 | High-precision gas distribution instrument |
| CN103331125B (en) * | 2013-07-23 | 2015-07-15 | 重庆大学 | High-precision gas distribution instrument |
| CN106457168A (en) * | 2014-05-09 | 2017-02-22 | 艾克斯特朗欧洲公司 | Device and method for providing a process gas mixture to a cvd or pvd coating device |
| CN105536587A (en) * | 2015-12-25 | 2016-05-04 | 南京信息工程大学 | Standard gas dynamic mixing instrument |
| CN106268493A (en) * | 2016-08-19 | 2017-01-04 | 北京艾立特科技有限公司 | A kind of liquid dynamic air-distributing device and air distributing method thereof |
| CN109283036A (en) * | 2018-08-28 | 2019-01-29 | 南京天博环境检测技术有限公司 | A kind of portable gas pollutant dilution device |
| CN109708943A (en) * | 2019-02-28 | 2019-05-03 | 山东非金属材料研究所 | The preparation method of bromo-trichloromethane gas reference material in a kind of nitrogen |
| CN109708943B (en) * | 2019-02-28 | 2021-09-14 | 山东非金属材料研究所 | Preparation method of trichlorobromomethane gas standard substance in nitrogen |
| CN110142161A (en) * | 2019-05-30 | 2019-08-20 | 上海理工大学 | Aromatic liquid hydrocarbon compound is continuously atomized and stablizes generating device and method |
| CN111715086A (en) * | 2020-06-12 | 2020-09-29 | 上海交通大学 | Cavity for premixing multiple gases |
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Granted publication date: 20111130 Termination date: 20120430 |