CN106237877A - A kind of dynamically gas-liquid mixed distributing instrument - Google Patents
A kind of dynamically gas-liquid mixed distributing instrument Download PDFInfo
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- CN106237877A CN106237877A CN201610862877.0A CN201610862877A CN106237877A CN 106237877 A CN106237877 A CN 106237877A CN 201610862877 A CN201610862877 A CN 201610862877A CN 106237877 A CN106237877 A CN 106237877A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/20—Mixing gases with liquids
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/10—Mixing gases with gases
- B01F23/12—Mixing gases with gases with vaporisation of a liquid
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/20—Measuring; Control or regulation
- B01F35/21—Measuring
- B01F35/211—Measuring of the operational parameters
- B01F35/2115—Temperature
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/20—Measuring; Control or regulation
- B01F35/21—Measuring
- B01F35/2132—Concentration, pH, pOH, p(ION) or oxygen-demand
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/20—Measuring; Control or regulation
- B01F35/22—Control or regulation
- B01F35/2201—Control or regulation characterised by the type of control technique used
- B01F35/2202—Controlling the mixing process by feed-back, i.e. a measured parameter of the mixture is measured, compared with the set-value and the feed values are corrected
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/71—Feed mechanisms
- B01F35/717—Feed mechanisms characterised by the means for feeding the components to the mixer
- B01F35/7176—Feed mechanisms characterised by the means for feeding the components to the mixer using pumps
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/80—Forming a predetermined ratio of the substances to be mixed
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/90—Heating or cooling systems
- B01F35/91—Heating or cooling systems using gas or liquid injected into the material, e.g. using liquefied carbon dioxide or steam
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0006—Calibrating gas analysers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/90—Heating or cooling systems
- B01F2035/99—Heating
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Abstract
The invention discloses a kind of dynamically gas-liquid mixed distributing instrument, this distributing instrument includes gas distribution part, liquid gasification part, distributing instrument system board and Win ce industry control screen, gas distribution part includes a plurality of gas circuit, series connection three-way magnetic valve in Article 4 gas circuit, series connection two-way electromagnetic valve in remaining gas circuit, equal Tandem mass flow controller after every gas circuit solenoid, three-way magnetic valve is connected with the two-way electromagnetic valve in other gas circuits by two-way electromagnetic valve respectively；Liquid gasification part includes constant temperature heating device and syringe pump, the mass flow controller not being connected with the air inlet of mixing chamber is connected with the first import of constant temperature heating device, syringe pump is connected with the second import of constant temperature heating device, and the outlet of constant temperature heating device is connected with the air inlet of mixing chamber；Win ce industry control screen is connected with distributing instrument system board, and distributing instrument system board is connected with all of two-way electromagnetic valve, three-way magnetic valve, mass flow controller, constant temperature heating device and syringe pump respectively.
Description
Technical field
The invention belongs to gas analysis technology field, be specifically related to a kind of dynamically gas-liquid mixed distributing instrument.
Background technology
At gas analysis detection field, it is often necessary to use distributing instrument to produce calibrating gas, for the mark of monitoring instrument
Determine and calibration, be also required to the gas of a certain amount of concentration of proportioning equally in fields such as environment, scientific research, biological medicines.
Currently available technology has occurred in that the proportioning mode of multiple gas-liquid mixed, such as Publication No. CN102580606A
Chinese patent literature disclose a kind of dynamic gas distribution instrument, including carrier gas air inlet copper pipe, unstripped gas air inlet pipe, escape pipe, control
System processed, thermostatic chamber, gas mixer chamber, at least one glass anemostat and anemostat bracket；Wherein, described gas mixer chamber is put
In thermostatic chamber；Described glass anemostat inserts anemostat bracket and is placed in bottom gas mixer chamber；Anemostat bracket is provided with and carries
Hands；It is additionally provided with temperature sensor bottom described gas mixer chamber, contacts with anemostat bracket base；Described gas mixer chamber is outward
Surface Machining has the aluminum pipe of screw thread cutting；Described carrier gas air inlet copper pipe and Electrothermic wire are simultaneously wound in described aluminum tube surfaces
In spiral groove；Described carrier gas air inlet copper pipe, unstripped gas air inlet pipe, escape pipe both pass through thermostatic chamber and are connected with gas mixer chamber
Logical；Described control system includes microcomputer controller, touches display screen, temperature controller, 2 mass flow controllers, wherein, described
Microcomputer controller respectively with described touch display screen, temperature controller, 2 mass flow controller Electricity Federations, described 2 mass flows
Controller respectively with carrier gas air inlet copper pipe, unstripped gas air inlet pipe Electricity Federation, described temperature controller and gas mixer chamber Electricity Federation.
Although dynamic gas distribution instrument can be waved by liquid disclosed in the Chinese patent literature of Publication No. CN102580606A
The mode sent out configures gas-liquid mixed gas, but owing to different liquids situation of volatilizing in the case of temperature instability is different
, may not necessarily reach to test required matched proportion density, this distribution mode is also the most passive, and precision is the highest, and this is dynamic simultaneously
Distributing instrument also can only proportioning one gas one liquid or the gaseous mixture of two gas, it is impossible to complete the mixed preparing of multiple gases.
Summary of the invention
It is an object of the invention to provide a kind of dynamically gas-liquid mixed distributing instrument, can accurately configure gas-liquid mixed gas,
Four road gas mixtures, within degree of accuracy 1%.
For achieving the above object, dynamic gas-liquid mixed distributing instrument of the present invention includes gas distribution part, liquid gas
Changing part, distributing instrument system board and Win ce industry control screen, described gas distribution part includes a plurality of gas circuit, in Article 4 gas circuit
Series connection three-way magnetic valve, two-way electromagnetic valve that remaining gas circuit is connected, equal Tandem mass flow-control after every gas circuit solenoid
Device, wherein the three-way magnetic valve in a gas circuit is connected with the two-way electromagnetic valve in other gas circuits by two-way electromagnetic valve respectively；
Mass flow controller in other gas circuits described is connected with the air inlet of mixing chamber respectively；Described liquid gasification part includes perseverance
Temperature heater and syringe pump, the mass flow controller not being connected with the air inlet of mixing chamber and the first of constant temperature heating device
Import connects, and syringe pump is connected with the second import of constant temperature heating device, the outlet of constant temperature heating device and the air inlet of mixing chamber
Mouth connects；Described Win ce industry control screen is connected with described distributing instrument system board, and described distributing instrument system board is respectively with all
Two-way electromagnetic valve, three-way magnetic valve, mass flow controller, constant temperature heating device and syringe pump connect.
Being provided with temperature sensor and PID temp controlled meter in described constant temperature heating device, described Win ce industry control screen is used for supplying
User inputs trim analysis, and trim analysis is transferred to described distributing instrument system board, described distributing instrument system board according to
Trim analysis sends control instruction to mass flow controller, syringe pump and PID temp controlled meter, controls the warp in gas distribution part
Cross in a plurality of gas circuit the entrance gas flow of mixing chamber, liquid gasification part and enter the gas flow of constant temperature heating device, injection
The fltting speed of pump and the heating-up temperature of constant temperature heating device, thus by the gas outlet output distribution of mixing chamber, by mixed gas
The concentration of the distribution of the gas outlet output of room is corresponding with the trim analysis that user inputs.
Described trim analysis includes gas parameter, liquid parameter or uninterrupted.
Described gas distribution part includes four gas circuits, wherein connect in the first gas circuit the first two-way electromagnetic valve and the first matter
Amount flow controller, the first entrance of the first two-way electromagnetic valve and the air inlet of the first gas circuit connect, and the first mass flow controls
The outlet of device is connected with the first air inlet of mixing chamber；Connect in second gas circuit the second two-way electromagnetic valve and the second mass flow control
Device processed, the first entrance of the second two-way electromagnetic valve and the air inlet of the second gas circuit connect, the outlet of the second mass flow controller
It is connected with the second air inlet of mixing chamber；Series connection the 3rd two-way electromagnetic valve and the 3rd mass flow controller in 3rd gas circuit, the
First entrance of three two-way electromagnetic valves and the air inlet of the 3rd gas circuit connect, the outlet of the 3rd mass flow controller and mixing chamber
The 3rd air inlet connect；Connect in 4th gas circuit three-way magnetic valve and the 4th mass flow controller, the of three-way magnetic valve
One outlet be connected with the entrance of the 4th mass flow controller, three-way magnetic valve second export respectively with the 4th two-way electromagnetic valve
Entrance, the entrance of the 5th two-way electromagnetic valve and the 6th two-way electromagnetic valve entrance connect；The outlet of the 4th two-way electromagnetic valve with
The outlet of the first two-way electromagnetic valve connects, and the outlet of the 5th two-way electromagnetic valve is connected with the outlet of the second two-way electromagnetic valve, and the 6th
The outlet of two-way electromagnetic valve is connected with the outlet of the 3rd two-way electromagnetic valve；The outlet of the 4th mass flow controller and heated at constant temperature
First import of device connects, and syringe pump is connected with the second import of constant temperature heating device, and the outlet of constant temperature heating device is with mixed
4th air inlet of air chamber connects.
Described constant temperature heating device includes adding pipe line, described in add pipe line and be wound around by heating tape, add pipe line and be loaded on close
In joint sealing body, fill with heat-preservation cotton in the middle of seal case, constant temperature heating device be provided with temperature sensor and PID temp controlled meter,
PID temp controlled meter is used for controlling the temperature of heating tape.
The air inlet of the 4th gas circuit is connected with air compressor.
Described Win ce industry control screen is connected with described distributing instrument system board, described distributing instrument system board and the first mass
Flow controller, the second mass flow controller, pass through between the 3rd mass flow controller and the 4th mass flow controller
RS232 or RS485 serial ports communicates；Communicated by RS485 serial ports between described distributing instrument system board and syringe pump.
Described Win ce industry control screen built-in embedded WINCE system.
Described syringe pump includes motor, leading screw, slide block and syringe, and the outlet of described syringe connects constant temperature heating device
Second import connect, described slide block is connected on leading screw, and leading screw is connected with motor.
Described dynamic gas-liquid mixed distributing instrument uses Closed Loop Fuzzy Control technology, installs in the gas outlet of mixing chamber and is used for
The detection sensor of detected gas concentration, described detection sensor is connected with described distributing instrument system board, described distributing instrument system
System mainboard controls the fltting speed of syringe pump according to the gas concentration signal of detection sensor output.
Present invention have the advantage that dynamic gas-liquid mixed distributing instrument of the present invention solves in prior art original
Equipment can not the problem of accurate formulation gas-liquid mixed gas, dynamic gas-liquid mixed distributing instrument of the present invention can be used for gas analysis
The test of the multiple technologies indexs such as linear, accuracy, the repeatability of instrument is calibrating, safeguarding and keep in repair gas analysis instrument can not
The testing tool lacked and the generating means of fixed concentration gas, it is adaptable to the gas that the units such as factory, scientific research, laboratory use
The calibration of body analyser or the test preparation of Standard Gases sample.
Accompanying drawing explanation
Fig. 1 is the attachment structure schematic diagram of dynamic gas-liquid mixed distributing instrument of the present invention.
Fig. 2 is the logical structure schematic diagram of dynamic gas-liquid mixed distributing instrument of the present invention.
Fig. 3 is the structural representation of syringe pump of the present invention.
Fig. 4 is the control principle schematic diagram of dynamic gas-liquid mixed distributing instrument of the present invention.
Detailed description of the invention
Following example are used for illustrating the present invention, but are not limited to the scope of the present invention.
In a preferred embodiment as shown in Figure 1, described gas distribution part includes four gas circuits, wherein the first gas circuits
Connect on 1 first two-way electromagnetic valve 21 and the first mass flow controller 31, the first entrance of the first two-way electromagnetic valve 21 and
The air inlet of one gas circuit 1 connects, and the outlet of the first mass flow controller 31 is connected with the first air inlet of mixing chamber 5；Second
Connect in gas circuit 2 second two-way electromagnetic valve 22 and the second mass flow controller 32, the first entrance of the second two-way electromagnetic valve 22
Being connected with the air inlet of the second gas circuit 2, the outlet of the second mass flow controller 32 is connected with the second air inlet of mixing chamber 5；
Series connection the 3rd two-way electromagnetic valve 23 and the 3rd mass flow controller 33, the first of the 3rd three-way magnetic valve 23 in 3rd gas circuit 3
The air inlet of entrance and the 3rd gas circuit 3 connects, and the outlet of the 3rd mass flow controller 33 connects with the 3rd air inlet of mixing chamber 5
Connect；Connect in 4th gas circuit 4 three-way magnetic valve 24 and the 4th mass flow controller 34, the first outlet of three-way magnetic valve 24 with
The entrance of the 4th mass flow controller 34 connects, the second outlet of three-way magnetic valve 24 respectively with the 4th two-way electromagnetic valve 11
The entrance of entrance, the entrance of the 5th two-way electromagnetic valve 12 and the 6th two-way electromagnetic valve 13 connects；Going out of 4th two-way electromagnetic valve 11
Mouth is connected with the outlet of the first two-way electromagnetic valve 21, the outlet of the 5th two-way electromagnetic valve 12 and the outlet of the second two-way electromagnetic valve 22
Connecting, the outlet of the 6th two-way electromagnetic valve 13 is connected with the outlet of the 3rd two-way electromagnetic valve 23；4th mass flow controller 34
Outlet be connected with the first import of constant temperature heating device 6, syringe pump 7 is connected with the second import of constant temperature heating device 6, constant temperature
The outlet of heater 6 is connected with the 4th air inlet of mixing chamber 5.
Described constant temperature heating device 6 includes adding pipe line, described in add pipe line and be wound around by heating tape, add pipe line and be loaded on close
In joint sealing body, fill with heat-preservation cotton in the middle of seal case, constant temperature heating device 6 be provided with temperature sensor and PID temp controlled meter,
PID temp controlled meter is used for controlling the temperature of heating tape.
Although having four gas circuits in the embodiment shown in Fig. 1, but those skilled in the art are fully able to understand, this
Bright it is not limited to four gas circuits, the quantity of gas circuit can be set according to actual needs.
As in figure 2 it is shown, the air inlet of the 4th gas circuit 4 is connected with air compressor 8.
Described Win ce industry control screen 10 is connected with described distributing instrument system board 9, described distributing instrument system board 9 and first
Mass flow controller the 31, second mass flow controller the 32, the 3rd mass flow controller 33 and the 4th mass flow control
Communicated by RS232 or RS485 serial ports between device 34；Pass through between described distributing instrument system board 9 and syringe pump 7
RS485 serial ports communicates.
The built-in embedded WIN CE system of described Win ce industry control screen 10 (containing display with mutual).
As it is shown on figure 3, described syringe pump 7 includes motor, leading screw 71, slide block 72 and syringe 73, described syringe 73
Outlet connects the second import of constant temperature heating device 6 and connects, and described slide block 72 is connected on leading screw 71, and leading screw 71 is with motor even
Connect.
Motor drive leading screw 71 rotate, leading screw 71 and then band movable slider 72 axially movable, slide block 72 pushing syringe 73
Piston axially movable, liquid infusion is entered constant temperature heating device 6.
Owing to gas-liquid mixed distribution has a lot of uncontrollable factor, then can come at gaseous mixture outfan increase checking device
Realizing closed loop control mode, the concentration detected by sensor regulates liquid injection rate, is used for improving precision preparation.
As shown in Figure 4, dynamic gas-liquid mixed distributing instrument of the present invention uses Closed Loop Fuzzy Control technology, at mixing chamber
Gas outlet install for the detection sensor of detected gas concentration, described detection sensor and described distributing instrument system board 9
Connecting, described distributing instrument system board 9 controls the fltting speed of syringe pump according to the gas concentration signal of detection sensor output.
Closed loop control can be accomplished in that
User inputs the trim analysis such as gas parameter, liquid parameter, uninterrupted by Win ce industry control screen, and by distribution
Parameter is transferred to described distributing instrument system board, and distributing instrument system board sends control instruction to mass flow according to trim analysis
Controller, syringe pump and pid temp controlled meter, the distribution concentration that three's collaborative work output needs, it is simultaneously used for detected gas concentration
Detection sensor detection distribution result, the distribution result detected is exported to distributing instrument system board, distributing instrument system master
Buttress is according to the distribution result detected to adjust the fltting speed of flow and syringe pump, and system can be recorded every time according to feedback knot
The distribution regulation data that fruit is write down, make this system realize self-teaching function, after reaching the accumulation of certain data volume, can save inspection
Survey link, even if using open cycle system also to can reach the highest precision.
Dynamic gas-liquid mixed distributing instrument of the present invention is a kind of dynamic gas, liquid dosage and generating means, is collection
Liquid gasification generation, dynamic gas distribution and gas and the equipment of liquid mixing distribution.Gas distribution part uses quality stream
Amount controller controls the flow of multipath gas output different proportion, thus dynamically realizes the configuration of various gas concentration.Liquid
Gasifying section uses high accuracy syringe pump and constant temperature heating device, and bond quality flow controller carries out gasification with dilute to gas
Release, reach the function of liquid distribution.
The gas distribution operation principle of of the present invention dynamic gas-liquid mixed distributing instrument is described below.
Dosing mechanism (Air-DS, dynamic gas-liquid mixed distributing instrument the most of the present invention) uses mass flow controller
(i.e. gas flowmeter) controls steel cylinder gas and the flow of zero gas output different proportion, thus obtains mixing the most set in advance
Gas flow and concentration.The gas flowmeter that Air-DS uses is all based on accurately measuring volume flow.Volume flow
It is to be determined by the differential pressure at the internal unique cut-off equipment two ends of gas flowmeter, this cut-off equipment that Air-DS is used
Being referred to as laminar flow parts, the gas flowmeter with laminar flow parts is referred to as laminar flow flowmeter.Tested gas is by whole laminar flow portion
It is forced during part to split into the fluid layer being parallel to each other；Therefore the method for operation of Air-DS equipment is all determined by laminar flow parts.With
Unlike other flow measurements, on laminar flow flowmeter, pressure drop and flow are linear, and its principle is by such as lower section
Journey 1 represents:
Q=(P1-P2) π r4/8ηL
Wherein, Q is volume flow, and P1 is input static pressure, and P2 is exit static pressure, and r is laminar flow element radius, and η is that fluid is exhausted
To viscosity, L is laminar flow element length.
Owing to π, r and L are constants, equation 1 can be re-written as equation 2:
Q=K (Δ P/ η)
In equation 2, K is due to geometrical factor but constant, and in equation 2, Q represents that volume flow, Δ P represent that pressure reduction, η represent
Absolute viscosity, is general type gas viscosity.In order to obtain accurate volume flow, it is necessary to select tested gas type (tested
Gas type determines the numerical value of absolute viscosity).This is critically important because equipment be according to tested gas measure temperature time
The absolute viscosity waited calculates flow.If selected gas is not the gas of actual measurement, calculated flow rate when
The k value of mistake will be used, thus export incorrect result, improper value be proportional to two kinds of gases (i.e. selected gas and
The actual gas measured) viscosity poor.
In a preferred embodiment as shown in Figure 1, dynamic gas-liquid mixed distributing instrument of the present invention can be accurately
Configure four road gas mixtures, such as, can access zero gas on the air inlet of the first gas circuit 1, in the second gas circuit the 2, the 3rd gas circuit
3 and the 4th gas circuit 4 air inlet on be respectively connected to different steel cylinder gas, by close the 4th two-way electromagnetic valve the 11, the 5th two-way
Electromagnetic valve the 12, the 6th two-way electromagnetic valve the 13, the 3rd two-way electromagnetic valve 23 and three-way magnetic valve 24, open the first two-way electromagnetic valve 21
With the second two-way electromagnetic valve 22, it is possible to achieve the mixing distribution of the gas of the first gas circuit 1 and the second gas circuit 2, by the first mass
Flow controller 31 controls the gas flow of the first gas circuit 1, is controlled the gas of the second gas circuit 2 by the second mass flow controller 32
Body flow, the gas of the first gas circuit 1 and the gas of the second gas circuit 2 all enter mixing chamber 5 mix homogeneously, obtain the concentration of needs
Distribution, is exported by the gas outlet 51 of mixing chamber 5.
Similarly, by close the 4th two-way electromagnetic valve 11, the 5th two-way electromagnetic valve 12, the 6th two-way electromagnetic valve 13, the
One two-way electromagnetic valve 21 and three-way magnetic valve 24, open the second two-way electromagnetic valve 22 and the 3rd two-way electromagnetic valve 23, it is possible to achieve
The mixing distribution of the gas of the second gas circuit 2 and the 3rd gas circuit 3；By closing the 4th two-way electromagnetic valve the 11, the 5th two-way electromagnetic valve
12, the 6th two-way electromagnetic valve the 13, second two-way electromagnetic valve 22 and three-way magnetic valve 24, opens the first two-way electromagnetic valve 21 and the 3rd
Two-way electromagnetic valve 23, it is possible to achieve the mixing distribution of the gas of the first gas circuit 1 and the 3rd gas circuit 3；By closing the four or two energising
Magnet valve the 11, the 5th two-way electromagnetic valve the 12, the 6th two-way electromagnetic valve 13, opens first two-way electromagnetic valve the 21, second two-way electromagnetic valve
22 and the 3rd two-way electromagnetic valve 23, it is possible to achieve the mixing distribution of the gas of first gas circuit the 1, second gas circuit 2 and the 3rd gas circuit 3；
By opening the 4th two-way electromagnetic valve the 11, the 5th two-way electromagnetic valve the 12, the 6th two-way electromagnetic valve 13 and three-way magnetic valve 24, close
First two-way electromagnetic valve the 21, second two-way electromagnetic valve the 22, the 3rd two-way electromagnetic valve 23, leads to zero gas by the air inlet of the 4th gas circuit 4,
The cleaning process to whole gas circuit can be realized.
The liquid generation gas distribution operation principle of of the present invention dynamic gas-liquid mixed distributing instrument is described below.
Liquid generation gas distribution follows static capacity method distribution principle, and static capacity method distribution principle is to be intended to join
Component gas (or liquid) is injected in sealing container (mixing chamber) by injection orifice, is simultaneously directed diluent gas, is sufficiently stirred for
After mixing, recording the temperature of mixed gas, pressure, by being intended to injection rate that combo divides, volume of a container, temperature, piezometer calculate
The concentration of calibrating gas.Its computing formula is as follows:
1. fluid density unit (g/ml)
2. syringe pump fltting speed unit (ml/min) (calculating with liquid volume)
3. syringe pump propelling liquid velocity: 3.=1. × 2. (calculate with liquid quality)
G/ml × ml/min=g/min (unit: gram/minute)
Distribution output concentration: 3. ÷ dilution flow rate
g/min÷m3/ min=g/m3(unit: gram/cubic metre)
During distribution, user inputs the trim analysis such as gas parameter, liquid parameter, uninterrupted by Win ce industry control screen,
And trim analysis is transferred to described distributing instrument system board, described distributing instrument system board is according to liquid parameter and required distribution
Concentration control syringe pump push-in stroke, add in pipe line simultaneously have the 4th mass flow controller 34 output zero gas and liquid
Hybrid Heating, produce gas-liquid mixed steam, due to mass flow controller output gas flow, syringe pump fltting speed, add
Hot temperature is all uniform and stable, so the amount having only to control three just can accurately make gas-liquid mixed gas.
Gas-liquid mixed distribution traditional in prior art only has a kind of mode volatilized by liquid, weigh in sealing container
Complete, cause the problems such as gas generation speed is slow, affected greatly by environmental variable, precision is low, high concentrations of gas cannot configure, this
Dynamic gas-liquid mixed distributing instrument described in invention achieves fully automated control, has high accuracy, the feature of high stability, solves
Disadvantages described above.
Dynamic gas-liquid mixed distributing instrument support of the present invention carries out gas, liquid distribution simultaneously and mixing distribution；
Flow-control uses Closed Loop Fuzzy Control technology, and fast response time, flow-control is accurate；Zero atmospheric pressure and steel cylinder atmospheric pressure can be real
Time monitoring, it is ensured that supply gas pressure meets instrument requirements；There is multichannel calibrating gas input interface, eliminate the multiple steel cylinder gas of replacing
Loaded down with trivial details.
Although, the present invention is described in detail to have used general explanation and specific embodiment, but at this
On the basis of invention, can make some modifications or improvements it, this will be apparent to those skilled in the art.Therefore,
These modifications or improvements without departing from theon the basis of the spirit of the present invention, belong to the scope of protection of present invention.
Claims (10)
1. a dynamic gas-liquid mixed distributing instrument, described dynamic gas-liquid mixed distributing instrument includes gas distribution part, liquid gasification
Partly, distributing instrument system board and Win ce industry control screen, it is characterised in that described gas distribution part includes a plurality of gas circuit, the
Article four, series connection three-way magnetic valve in gas circuit, two-way electromagnetic valve that remaining gas circuit is connected, matter of all connecting after every gas circuit solenoid
Amount flow controller, wherein the three-way magnetic valve in a gas circuit is respectively by two-way electromagnetic valve and two energisings in other gas circuits
Magnet valve connects；Mass flow controller in other gas circuits described is connected with the air inlet of mixing chamber respectively；Described liquid gasification
Part includes constant temperature heating device and syringe pump, the mass flow controller not being connected and heated at constant temperature with the air inlet of mixing chamber
First import of device connects, and syringe pump is connected with the second import of constant temperature heating device, and the outlet of constant temperature heating device is with mixed
The air inlet of air chamber connects；Described Win ce industry control screen is connected with described distributing instrument system board, described distributing instrument system board
It is connected with all of two-way electromagnetic valve, three-way magnetic valve, mass flow controller, constant temperature heating device and syringe pump respectively.
2. dynamically gas-liquid mixed distributing instrument as claimed in claim 1, it is characterised in that be provided with in described constant temperature heating device
Temperature sensor and PID temp controlled meter, described Win ce industry control screen is for inputting trim analysis for user, and is transmitted by trim analysis
To described distributing instrument system board, described distributing instrument system board according to trim analysis to mass flow controller, syringe pump and
PID temp controlled meter sends control instruction, controls to enter the gas flow of mixing chamber, liquid through a plurality of gas circuit in gas distribution part
Body gasifying section enters the heating temperature of the gas flow of constant temperature heating device, the fltting speed of syringe pump and constant temperature heating device
Degree, thus by the gas outlet output distribution of mixing chamber, the distribution concentration of the gas outlet output of mixing chamber and joining that user inputs
Gas parameter is corresponding.
3. dynamically gas-liquid mixed distributing instrument as claimed in claim 2, it is characterised in that described trim analysis includes that gas is joined
Number, liquid parameter or uninterrupted.
4. dynamically gas-liquid mixed distributing instrument as claimed in claim 3, it is characterised in that described gas distribution part includes four
Gas circuit, wherein connect in the first gas circuit the first two-way electromagnetic valve and the first mass flow controller, the of the first two-way electromagnetic valve
The air inlet of one entrance and the first gas circuit connects, and the outlet of the first mass flow controller connects with the first air inlet of mixing chamber
Connect；Connect in second gas circuit the second two-way electromagnetic valve and the second mass flow controller, the first entrance of the second two-way electromagnetic valve
Being connected with the air inlet of the second gas circuit, the outlet of the second mass flow controller is connected with the second air inlet of mixing chamber；3rd
Series connection the 3rd two-way electromagnetic valve and the 3rd mass flow controller, the first entrance of the 3rd two-way electromagnetic valve and the 3rd gas in gas circuit
The air inlet on road connects, and the outlet of the 3rd mass flow controller is connected with the 3rd air inlet of mixing chamber；Go here and there in 4th gas circuit
Ter three-way electromagnetic valve and the 4th mass flow controller, the first outlet of three-way magnetic valve and entering of the 4th mass flow controller
Mouthful connect, the second outlet of three-way magnetic valve respectively with the entrance of the 4th two-way electromagnetic valve, the entrance of the 5th two-way electromagnetic valve and
The entrance of the 6th two-way electromagnetic valve connects；The outlet of the 4th two-way electromagnetic valve is connected with the outlet of the first two-way electromagnetic valve, and the 5th
The outlet of two-way electromagnetic valve is connected with the outlet of the second two-way electromagnetic valve, the outlet of the 6th two-way electromagnetic valve and the 3rd two-way electromagnetism
The outlet of valve connects；The outlet of the 4th mass flow controller is connected with the first import of constant temperature heating device, and syringe pump is with permanent
Second import of temperature heater connects, and the outlet of constant temperature heating device is connected with the 4th air inlet of mixing chamber.
5. dynamically gas-liquid mixed distributing instrument as claimed in claim 4, it is characterised in that described constant temperature heating device includes heating
Pipeline, described in add pipe line and be wound around by heating tape, add pipe line and be loaded in seal case, fill out with heat-preservation cotton in the middle of seal case
Filling, be provided with temperature sensor and PID temp controlled meter in constant temperature heating device, PID temp controlled meter is used for controlling the temperature of heating tape.
6. dynamically gas-liquid mixed distributing instrument as claimed in claim 5, it is characterised in that the air inlet of the 4th gas circuit and air pressure
Contracting machine connects.
7. dynamically gas-liquid mixed distributing instrument as claimed in claim 6, it is characterised in that described Win ce industry control screen is joined with described
Gas instrument system mainboard connects, described distributing instrument system board and the first mass flow controller, the second mass flow controller, the
Communicated by RS232 or RS485 serial ports between three mass flow controllers and the 4th mass flow controller；Described distribution
Communicated by RS485 serial ports between instrument system mainboard and syringe pump.
8. dynamically gas-liquid mixed distributing instrument as claimed in claim 7, it is characterised in that the described Win ce built-in embedding of industry control screen
Formula WINCE system.
9. dynamically gas-liquid mixed distributing instrument as claimed in claim 8, it is characterised in that described syringe pump include motor, leading screw,
Slide block and syringe, the outlet of described syringe connects the second import of constant temperature heating device and connects, and described slide block is connected to silk
On thick stick, leading screw is connected with motor.
10. dynamically gas-liquid mixed distributing instrument as claimed in claim 9, it is characterised in that described dynamic gas-liquid mixed distribution
Instrument uses Closed Loop Fuzzy Control technology, installs the detection sensor for detected gas concentration in the gas outlet of mixing chamber, described
Detection sensor is connected with described distributing instrument system board, and described distributing instrument system board is according to the gas of detection sensor output
Concentration signal controls the fltting speed of syringe pump.
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| CN201610862877.0A CN106237877B (en) | 2016-09-28 | 2016-09-28 | A kind of dynamic gas-liquid mixed distributing instrument |
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| CN111579718A (en) * | 2020-05-07 | 2020-08-25 | 西安电子科技大学 | Automatic dynamic testing device for gas sensitivity characteristics |
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