Intelligence multicomponent dynamic air-distributing device
Technical field
The utility model relates to the gas distribution equipment field, is specially a kind of intelligent multicomponent dynamic air-distributing device.
Background technology
The method of existing standard gas preparation mainly contains static distribution method and dynamic air-distributing method.Static distribution method is the unstripped gas of a certain amount of gaseous state or steam attitude, is added in the container of known volume, and then adds diluent gas, mixes and makes standard gas.According to adding unstripped gas, the amount of carrier gas and the concentration that volume of a container calculates standard gas.Simple, the processing ease of static distribution method device therefor, but some aerochemistry character is more active, chemical reaction may take place in long-time the contact with chamber wall, simultaneously, chamber wall also has suction-operated, so can cause inaccurate or its concentration of preparation gas concentration with changing standing time, particularly prepare low concentration standard gas, often cause bigger error, therefore, the application of this method is subjected to certain restriction.The dynamic air-distributing method is the unstripped gas with concentration known, send in the gas mixer with certain flow invariablely, diluent gas passes through gas mixer with certain flow invariablely, mix with unstripped gas and with its dilution, gaseous mixture after the dilution continuously flows out from blender, supplies with and uses.The concentration of gaseous mixture can calculate from thinner ratio, and the flow-rate ratio of regulating unstripped gas and diluent gas can obtain the calibrating gas of desired concn.Though the dynamic air-distributing method on distribution equipment than static distribution method complexity many, as long as air distributing method and equipment once foundation, just can obtain the calibrating gas of a large amount of constant densities easily.If several gases do not interact, can also prepare multi-component mist easily.Because continuous-flow can reach balance, has avoided the unsettled shortcoming of concentration that causes because of microcomponent is adsorbed and reacting etc. in static distribution method.The dynamic air-distributing method is applicable to the standard gas of configuration low concentration.In addition, use same set of air distributing device, as required, not only can change distribution concentration at any time, but also can change standard pneumatolytic branch easily, these all are that static distribution method is incomparable, so dynamic air-distributing is widely used in gas analysis.
Along with the fast development of gas analysis, the gas analysis instrument of all kinds of precisions constantly is developed, uses, and when carrying out gasometric analysis, often needs to import the component gas sample of various variety classes variable concentrations.Therefore, the air distributing device that is adopted needs accurately to control the concentration of the component gas of input.
The utility model content
The purpose of this utility model provides a kind of intelligent multicomponent dynamic air-distributing device, by the signal and communication between computer, microcontroller and the mass flow controller, can control the concentration of the component gas of input gas mixer accurately, and quick, the convenient various calibrating gas that make the different component variable concentrations.
In order to achieve the above object, the technical scheme that the utility model adopted is:
Intelligence multicomponent dynamic air-distributing device comprises a plurality of mass flow controllers, it is characterized in that: also include gas mixer and intelligence controlling device; Described gas mixer is the seal that has a plurality of inlet channels and outlet passageway, and the outlet of described mass flow controller is communicated with one by one with the inlet channel of gas mixer respectively; Described intelligence controlling device comprises control circuit board and computer, is integrated with microprocessor, power supply circuits, bus switching circuit on the described control circuit board; Described power supply circuits include the filter circuit and the DC/DC circuit of mutual electrical connection, the input of described filter circuit is electrically connected with external power source introduces voltage, have a plurality of outputs to be electrically connected one by one with power supply with the power end of described mass flow controller respectively on the described filter circuit, the output of described DC/DC circuit is electrically connected with the power interface of microprocessor with power supply; Described bus switching circuit comprises that the USB that is electrically connected to each other changes 485 circuit and 485 and changes the SCI circuit, described 485 change SCI circuit signal end is electrically connected with the EBI of microprocessor, the communication interface of mass flow controller respectively, and the signal end that described USB changes 485 circuit is electrically connected with USB interface of computer.
Described intelligent multicomponent dynamic air-distributing device is characterized in that: described gas mixer is that stainless steel material is made, and the inlet channel of gas mixer radially is provided with, and also has the outlet passageway of axial setting on the gas mixer.
The utility model mainly is made up of the computer of many digital mass flow controllers, gas mixer, control circuit board and prepackage control software.Wherein control circuit board mainly is integrated with usb bus changes circuit such as RS485 bus circuit, RS485 bus commentaries on classics SCI bus circuit, microcontroller, filter circuit, DC/DC circuit.Mainly be divided into three parts, first is the power supply circuits part, after external power source is introduced after filtration wave circuit power to mass flow controller, power to microcontroller through the DC/DC circuit again; Second portion is a bus switching circuit, is mainly used in connection computer and mass flow controller and microcontroller and communicates; Third part is a microcontroller, mainly act as on supervisory pilot light and the button data message and with computer in control software communicate.Model machine is provided with button and indicator lamp, the duty of monitoring, demonstration model machine.Clean or closed condition by the strong control mass flow control device internal valves that is mainly used in, the cleaning state reaches maximum for making valve, and it is maximum that the gas flow of the feasible mass flow controller of flowing through reaches; Closed condition is a valve-off, by the gas by mass flow controller.Indicator lamp is mainly used in the duty of display quality flow controller and the state of a control of display quality flow control device internal valves.
The utility model adopts computer and many mass flow controllers of prepackage control software to carry out communication, only select unstripped gas and diluent gas on the man-machine interface of need control software in computer during distribution, input unstripped gas concentration and aimed concn, set the output total gas flow rate, control software calculates the setting flow value of each passage automatically, transfer data to mass flow controller by USB interface again, control the output flow of each component raw material gas and carrier gas by mass flow controller, control software periodically reads the measured value of each component gas flow by USB interface, flow value calculates each component gas concentration thus, and on man-machine interface, show in real time, can monitor the actual concentrations value of each component gas in the hybrid standard gas of preparation with this.
Gas mixer of the present utility model is made by stainless steel processing, and compact conformation, corrosion resistance are strong; Each component gas again from axial output, makes each component gas evenly to mix by radially entering gas mixer.
The used device inner surface of the utility model air path part all has corrosion resistance, and any gas is not adsorbed, therefore the utility model also can be prepared various corrosive gas and toxic and harmful except various conventional gas, has improved the scope of application of the present utility model greatly.
Only need during the utility model distribution to carry out shirtsleeve operation in man-machine interface, not only can change distribution concentration at any time, can also change component gas easily, fast, convenient single-component gas or the multicomponent mist that makes various variety classes variable concentrations, and can with use with join, easy and simple to handle.Problems such as popularization of the present utility model can solve existing air distributing method complicated operation, and labour intensity is big, and unstripped gas and diluent gas consumption are big, and be consuming time many, and random error and accumulated error are big.
Description of drawings
Fig. 1 is the utility model apparatus structure schematic diagram.
Fig. 2 is the radial and axial cutaway view of gas mixer in the utility model, wherein:
Fig. 2 a is a vertical view, and Fig. 2 b is a side view.
Fig. 3 is the circuit theory diagrams of control circuit board in the utility model.
The specific embodiment
As Fig. 1, Fig. 2 and shown in Figure 3.Intelligence multicomponent dynamic air-distributing device comprises a plurality of mass flow controllers 1, also includes gas mixer 2, and intelligence controlling device; Gas mixer 2 is for having the seal of a plurality of inlet channels 5 and an outlet passageway 6, and gas mixer 2 is made for stainless steel material, and the inlet channel 5 of gas mixer 2 radially is provided with, and also has the outlet passageway 6 of axial setting on the gas mixer 2.The outlet of mass flow controller 1 is communicated with one by one with the inlet channel 5 of gas mixer 2 respectively; Intelligence controlling device comprises control circuit board 3 and computer 4, is integrated with microprocessor, power supply circuits, bus switching circuit on the control circuit board 3; Power supply circuits include the filter circuit and the DC/DC circuit of mutual electrical connection, the input of filter circuit is electrically connected with external power source introduces voltage, have a plurality of outputs to be electrically connected one by one with power supply with the power end of mass flow controller 1 respectively on the filter circuit, the output of DC/DC circuit is electrically connected with the power interface of microprocessor with power supply; Bus switching circuit comprises that the USB that is electrically connected to each other changes 485 circuit and 485 and changes the SCI circuit, 485 change SCI circuit signal end is electrically connected with the EBI of microprocessor, the communication interface of mass flow controller 1 respectively, and the signal end that USB changes 485 circuit is electrically connected with the USB interface of computer 4.
As shown in Figure 1, the utility model is by three digital mass flow controllers 1, and the computer 4 of gas mixer 2, control circuit board 3 and prepackage control software is formed.Wherein air path part mainly is made up of many digital mass flow controllers 1 and gas mixer 2.Diluent gas and unstripped gas are entered by the entrance point of many mass flow controllers 1, and by the output flow of mass flow controller 1 each component gas of control, each component gas enters gas mixer 2 then, evenly mix back output.The utility model can be extended to four-way, five-way road ... more multichannel dynamic air-distributing device only needs three mass flow controllers are increased to four, five ... get final product.
As shown in Figure 2, be gas mixer 2 radial and axial cutaway views.Gas mixer 2 is made by stainless steel material processing, and compact conformation, corrosion resistance are strong; Each component gas mixes by radially entering gas mixer 2, again from axial output.
As shown in Figure 3, control circuit board 3 changes 485 circuit, 485 by USB changes circuit such as SCI circuit, microcontroller, filter circuit, DC/DC circuit and constitutes.Mainly be divided into three parts, first is the power supply circuits part, and wave circuit was to mass flow controller 1 power supply after filtration after external power source was introduced, and process DC/DC circuit is powered to microcontroller again; Second portion is that USB changes 485 circuit, is mainly used in connection computer 4 and mass flow controller 1 and communicates; Third part is a microcontroller, is mainly used in the data message on supervisory pilot light and the button and communicates with computer 4.Model machine is provided with indicator lamp and button, is mainly monitored by microcontroller.Distribution just often, indicator lamp is bright.When pressing the button, microcontroller receives control signal and communicates with computer, and mass flow controller 1 is according to the cleaning of signal controlling internal valves or close.
Specific embodiment 1:
With configuration 100ppm concentration SO
2With 35% concentration C O
2Hybrid standard gas is example, with high pure nitrogen N
2As diluent gas, select the SO of 992ppm concentration for use
2CO with 99.99% concentration
2As unstripped gas, with diluent gas N
2, unstripped gas SO
2, CO
2Receive one, two, triple channel, link to each other with mass flow controller 1-a, 1-b, 1-c respectively.On the control software interface, select diluent gas N
2With component gas SO
2, CO
2, input Primordial Qi concentration and aimed concn, the total flow of setting output is 2L/Min, clicks start button and begins distribution.Control software 4 calculates N automatically
2, SO
2, CO
2The setting flow value be respectively 0.9763L/Min, 0.1794L/Min, 0.8443L/Min.Mass flow controller 1-a, 1-b, 1-c receive setting value and it are revised, and control N then
2, SO
2, CO
2Output flow.Control software 4 reads flow measurements and to its correction, obtains N from mass flow controller 1-a, 1-b, 1-c
2, SO
2, CO
2Flow be respectively 0.9763L/Min, 0.1794L/Min, 0.8444L/Min, calculate the SO of output
2, CO
2Concentration be respectively 100ppm, 35.0021%.Mass flow controller 1-b, 1-c are respectively 100ppm, 35.0021% SO with concentration
2, CO
2Send into gas mixer 2 continually, evenly mix back output, so just can obtain our required gaseous mixture.