CN103170262A - High-precision variable gas proportion mixing apparatus and gas proportion mixing method - Google Patents
High-precision variable gas proportion mixing apparatus and gas proportion mixing method Download PDFInfo
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Abstract
The invention discloses a high-precision variable gas proportion mixing apparatus. The apparatus comprises a mixing tank, gas sources corresponding to the kinds of gases, and a control circuit, wherein the pressures of the gas sources are equal, the pressure of each of the gas sources is greater than the pressure of the mixing tank, the gas sources are connected with the mixing tank through pipelines, each of the pipelines is provided with a solenoid valve, each of the pipelines is also provided with a throttling device, the size sequence of the smallest effective section areas of the throttling devices is (partially) consistent with the size sequence of the proportions of the corresponding kinds of gases in a mixed gas, the control circuit comprises an information data input device and a control device having the information data and program processing functions, and the information data input device and the control end of the solenoid valve are respectively communicated with the control device. The apparatus has the advantages of simple structure, easy operation, high gas mixing proportion precision, and improvement of the market competitiveness; and additionally, the apparatus also realizes automatic control and automatic operation, so the work efficiency is improved.
Description
Technical field
The present invention relates to a kind of Gas Ratio Miring Device, specifically to a kind of high-precision variable proportional gas mixer and its gas mixing method.
Background technology
With developing rapidly for food science and technology, for food security and hygienic requirements, various countries technical staff is going into overdrive to research and develop food fresh keeping packing technique, to ensure that food can keep fresh, health etc. for a long time as far as possible during circulation and storage, at present, popular food fresh keeping packing technique is controlled atmosphere fresh-keeping packing, and controlled atmosphere fresh-keeping packing is also known as gas displacement packaging, and referred to as MAP is packed in the world（That is Modified Atmosphere Packing）, its principle is to use composite fresh-keeping gas（Two or more gas matches mixing by food properties）, line replacement is entered to the air in crisper or packaging bag, changes box（Bag）The external environment condition of interior food, reaches suppression bacterium（Microorganism）Growth procreation, slow down the rate of metabolism of fresh fruit of vegetables, so as to extend the freshness date or shelf life of food.
And for substitution gas, then needing Gas Ratio Miring Device to prepare, traditional Gas Ratio Miring Device is the Gas Ratio Miring Device that closed-loop control system is constituted, and it detects signal by gas sensor（Electric current or voltage signal）To control each road high-precision flow servo valve latus rectum size, so that control the ratio of the various gases into blending tank.This device in order to keep higher precision, it is necessary to using high-precision gas sensor, such a gas sensor it is expensive, and the servo flow valve used in the device, its price is also sufficiently expensive, therefore, and the cost of this kind of closed-loop gas proportion mixer is very high.In addition, this closed-loop gas proportion mixer is also present, complex structure, maintenance cost be high, control accuracy easily many defects such as is disturbed by extraneous factor.
The content of the invention
In order to solve deficiency of the prior art, the invention provides a kind of simple in construction, low cost, high-precision variable Gas Ratio Miring Device and its gas mixing method.
In order to achieve the above object, the technical solution adopted in the present invention is：
A kind of high-precision variable proportional gas mixer, including blending tank, source of the gas corresponding with gaseous species and control circuit, pressure between wherein each source of the gas is identical, and the pressure of source of the gas is more than the pressure of blending tank, and source of the gas is connected by pipeline with blending tank, magnetic valve is provided with the pipeline, it is characterized in that, throttling arrangement is additionally provided with the pipeline, the size order of the corresponding gaseous species of size order proportion in mixed gas of the minimum net sectional area of the throttling arrangement is consistent or part is consistent, described control circuit includes information data input unit and the control device with information data and program processing function, wherein, information data input unit, the control end of magnetic valve is connected with the control device respectively.
The described control device with information data and program processing function is programmable controller.
It also includes gas mixing ratio detection means.
The information of receive information data input device is provided with described programmable controller and magnetic valve is calculated and is turned on and off the program of time, the detection information of receiving detection device and the program for being compared with the information that information data input unit is inputted and calculating the program of error and being reset according to error result to program parameter.
The magnetic valve is fluid switching type magnetic valve.
Described information data input unit is touch-screen.
A kind of method that gas mixture at given volumeratio is carried out using above-mentioned high-precision variable proportional gas mixer, it is characterised in that：Comprise the following steps：
（1）Throttling arrangement is set in each road pipeline so that the size order of the corresponding gaseous species proportion in mixed gas of the size order of the minimum net sectional area that each road throttling arrangement is constituted is consistent or part is consistent；
（2）Inflation：The mixed proportion of each road gas is inputted in information data input unit, the control device with information data and program processing function is according to the gas ratio of setting, and the corresponding magnetic valve of each road gas phase is controlled by sequential operation is turned on and off the time；
（3）Detect the error amount between mixed gas mixing ratio and the gas mixing ratio of setting；
（4）Round-off error value：The gas ratio that the gas ratio detected in blending tank is inputted with information data input unit has error, and program parameter is reset by control device, and round-off error value, until gas ratio is consistent with the gas mixing ratio set in blending tank；
（5）The different mixing proportion of each road gas is reset, and is at least repeated once above-mentioned（2）、（3）And（4）Step, can obtain the mixed gas of high-precision mixed proportion.
The step（2）It is that gas mixing inflation is carried out using inflationtime cycle mixing method.
The step（3）It is the ratio that mixed each road gas in blending tank is detected by detection means, and detection information is transferred to the control device, the gas ratio that the control device is set according to information data input unit is compared with detection information, obtains gas mixing ratio error between the two.
The control device is programmable controller.
Wherein, the proportionate relationship of the minimum net sectional area between above-mentioned each passage has following several situations：
（1）Minimum net sectional area between each passage is identical, and this channel design is simple but gas mixing error is larger, when each road gas mixing ratio relatively when it is preferable using this scheme works；
（2）Minimum net sectional area ratio between each paths is identical or close with gas mixture ratio, using this structure, and gas mixing error is smaller, preferable using this scheme works when each road gas mixing, which compares, differs larger.
Above-mentioned source of the gas corresponding with gaseous species refers to every kind of gas separately as a kind of source of the gas, has several gases just to have several sources of the gas.
And above-mentioned magnetic valve is switching type general solenoid valve.
In addition, above-mentioned blending tank can be that 1 or two or more blending tank are in series, wherein, the structure connected using two or more blending tanks, better than one blending tank of mixing uniformity of its gas.
The present invention operation principle be：Throttling arrangement is set on pipeline, the size order of the corresponding gaseous species of size order proportion in mixed gas of the minimum net sectional area of throttling arrangement is consistent or part is consistent, so that the inflationtime of each road gas is consistent or close, so as to reduce gas mixing ratio error caused by the pressure difference change that blending tank pressure change is caused.In addition, the present invention further uses inflationtime cycle mixing method or for time slice mixing method, its detailed process is：By the break-make of Controlled by Programmable Controller magnetic valve, make each paths opening time identical, and the shut-in time then determines according to the relation of gas mixing ratio relation and the minimum net sectional area of passage；It is most long for a recharge cycle with inflationtime in each road gas, the further reduction of pressure difference change so in each recharge cycle blending tank, its final gas mixing ratio error is significantly less than error when gas is continuously mixed, so as to obtain the mixed gas of high-precision mixed proportion.
Its theoretical foundation is obtained by following specific discharge computing formula：
It is known：When air-flow is by pneumatic element, element entrance port pressure P1 is kept constant, make outlet pressure P2 reductions, if be reduced to
When, then air-flow reaches the velocity of sound：If
When air-flow in subsonic area, specific discharge computing formula is respectively：
（1）At velocity of sound area：
（2）At subsonic area：
So, the computing formula of total flow is in certain time：
（1）At velocity of sound area：
（2）At subsonic area：
In formula：P1 --- --- -- inlet pressures（Bar）
P2 --- --- -- outlet pressures（Bar）
S --- --- -- net sectional area mm2
T1 --- --- -- gas inlet temperature K
QZ--- --- -- is converted into the instantaneous metered flow l/min after free state
QO --- the total flow of --- -- in certain time
T --- --- -- duration of ventilation
From formula 3., 4., total flow and effective area S, duration of ventilation t and pressure difference are into corresponding relation, therefore change the net sectional area or cycle inflationtime of throttling arrangement, the pressure difference change reduced in blending tank is reached, so as to obtain the mixed gas of high-precision mixed proportion.
In addition, the mixed proportion of each gas in blending tank is detected by detection means, pass through the control device with information data and program processing function again, the embodiment of the present invention uses programmable controller, whether the mixed proportion for each gas in blending tank that the setting mixed proportion of each gas of comparison information data input device input is detected with detection means is consistent, if inconsistent, then reset program parameter, and control the opening/closing time of the magnetic valve of each passage, carry out error revision, to reduce or eliminate the systematic error in gas mixing, obtain high-precision gas mixture at given volumeratio.
In the technical program, there is following several situations in systematic error Producing reason：
1st, the break-make response time error of magnetic valve net sectional area mismachining tolerance and magnetic valve；
2nd, the length of gas ducting and the pressure loss error that causes；
3rd, the error that the molecular structure difference of two or more gases is caused, i.e., due to the different error caused of the compressibility of gas；
4th, the gas pressure change of blending tank causes the error of changes in flow rate.
The beneficial effects of the invention are as follows：
（1）The present invention is by using fluid on-off type general solenoid valve and pipeline configuration, without accurate gas concentration sensor and high-precision flow servo valve, using open cycle system, there was only 1/10th of traditional closed-loop system first from cost, greatly reduce cost, secondly, it is then simpler in structure, good stability, it is easy to operate, its precision fullys meet food fresh keeping gas mixture at given volumeratio requirement, further increases the competitiveness of product in market；
（2）Pass through special design on control circuit, the gas mixing ratio inputted by programmable controller is compared with the mixed proportion of each gas in the blending tank detected, and resetting for program parameter is carried out according to comparative result, systematic error can effectively be corrected, obtain high-precision ratio of gas mixture, and realize and automatically control and be automatically brought into operation, improve operating efficiency.
Brief description of the drawings
Fig. 1 is that the magnetic valve in the working state figure of the invention in the magnetic valve for inflating admixture, figure is in the conduction state, and A, B, C represent three kinds of gas with various respectively.
Main Reference Numerals implication is in figure：
1st, blending tank 2, A air chambers 3, B air chambers 4, C air chambers
A1, B1, C1 are throttling arrangement 5, magnetic valve 6, control circuit
7th, pipeline 8, valve 9, sampling Detection device
10th, information data input unit 11, programmable controller.
Embodiment
Below in conjunction with the accompanying drawings and embodiment the present invention will be further described：
Fig. 1 is the cross-sectional view of one embodiment of the invention.
As shown in Figure 1：The high-precision variable proportional gas mixer of the embodiment of the present invention, the purpose is to by multiple gases, such as carbon dioxide（CO2）, nitrogen（N2）And oxygen（O2）Food fresh keeping gas is mixed into proportion Deng three kinds of gases, and enter line replacement packaging to the gas in packaging for foodstuff, it includes the blending tank 1 being made up of container, three kinds of sources of the gas corresponding with gaseous species, pressure between each source of the gas is identical, and the respective pressure of three sources of the gas is more than the pressure of blending tank 1, and three sources of the gas are connected by three pipelines 7 with blending tank 1 respectively, a magnetic valve 5 and throttling arrangement A1 are respectively arranged with three pipelines 7, B1 and C1, wherein, throttling arrangement A1, B1 is consistent with scale sequence consensus or part that the C1 minimum corresponding gaseous species of net sectional area size order are shared in mixed gas, high-precision variable proportional gas mixer is additionally provided with detection means 9, and described control circuit 6 includes information data input unit 10, programmable controller（PLC）11, wherein, in the present embodiment, information data input unit 10 is touch-screen, the part of information, such as button can certainly be needed for other feasible can inputting, touch-screen, the control end of magnetic valve 5 and detection means 9 can be connected with programmable controller 11 respectively.
The information of the input of receive information data input device 10 is provided with above-mentioned programmable controller 11 and magnetic valve 5 is calculated and is turned on and off the program of time, the detection information of receiving detection device 9 and the program for being compared with the information that information data input unit 10 is inputted and calculating the program of error and being reset according to error result to program parameter.
Assuming that the mixed proportion of three kinds of gas is 7：2：1, be specially using overlap span inflation hybrid mode：It is set as that cycle some time is carried out by controlling circuit 6 by the continuous mixed process of gas, it is most long for a recharge cycle with inflationtime in each road gas, each paths opening time is consistent in every section, and such as gas communication time is set as 7 by programmable controller 11:2:1, when so working, three kinds of gases are flowed into blending tank 1 from each air chamber through pipeline 7, magnetic valve 5 and throttling arrangement respectively, and the food fresh keeping gas mixed in proportion in blending tank 1, then enter line replacement to the gas in crisper through valve 8.Because each cycle all leaves regular hour gap, so every section of paths two ends of opening point three pressure difference always, reduce the error of every segment endpoint, error of its mixing resultant done kind is significantly less than error when gas is continuously mixed, and close to mixed proportion.
In present embodiment, in order to further reduce due to error caused by pressure difference change during gas mixing, mixed proportion can be expanded 2 times for the minimum net sectional area of the corresponding passage of maximum ratio gas kind of " 7 ", the ratio of such control time should be changed to 7/2:1:1, it so can further reduce error.
And the method that gas mixture at given volumeratio is carried out using above-mentioned high-precision variable proportional gas mixer, comprise the following steps, the mixed proportion of three kinds of gas is 7：2：Exemplified by 1：
（1）The minimum net sectional area of each road throttling arrangement is set, and the purpose is to for changing the flow of air admission hole in the unit interval, be close to obtain several gas inflated times, it is assumed that the minimum net sectional area of passage after setting is respectively 7/2:1:1；
（2）Inflation：Carbon dioxide is inputted on touch-screen 10（CO2）, nitrogen（N2）And oxygen（O2）The mixed proportion of three kinds of gas, as 7：2：1, programmable controller 11 is according to the gas ratio set on touch-screen 10, and the corresponding magnetic valve 5 of three kinds of gas phases is controlled by program conversion is turned on and off the time；It was an inflationtime cycle with 2 seconds, carries out gas mixing inflation；
（3）Measurement error value：The ratio of mixed three kinds of gas in blending tank 1 is detected by detection means 9, and transmits information to set good gas ratio on programmable controller 11, the control touch-screen 10 of programmable controller 11, to compare the error of both gas ratios；
（4）Round-off error value：The gas ratio detected in blending tank 1 is with gas ratio set on touch-screen 10 if any error, program parameter is reset by programmable controller 11, the opening time of the corresponding magnetic valve of gas is reset by programmable controller 11, round-off error value, up to the ratio set on gas ratio in blending tank 1 and touch-screen 10 is consistent；
（5）The mixed proportion of each road gas is reset, is repeated above-mentioned（2）、（3）And（4）Step 2 to 3 time.The systematic error of open loop Gas Ratio Miring Device can be effectively corrected, when carrying out gas mixing, high-precision gas mixture ratio is obtained.
Tests prove that：Set two or more gas ratio values and detect that error is can be controlled within ± 1.0% between mixed gas ratio value in blending tank 1, and its manufacturing cost is only that closed loop mixes gas system 10% with the mixed gas systematic comparison of closed loop using the mixed gas system of open loop of the present invention.
The general principle and principal character and advantages of the present invention of the above present invention; it should be understood by those skilled in the art that; the present invention is not limited to the above embodiments; merely illustrating the principles of the invention described in above-described embodiment and specification; without departing from the spirit and scope of the present invention; various changes and modifications of the present invention are possible; these changes and improvements all fall within the protetion scope of the claimed invention, and the claimed scope of the invention is by appending claims and its equivalent thereof.
Claims (10)
1. a kind of high-precision variable proportional gas mixer, including blending tank, source of the gas corresponding with gaseous species and control circuit, pressure between wherein each source of the gas is identical, and the pressure of source of the gas is more than the pressure of blending tank, and source of the gas is connected by pipeline with blending tank, magnetic valve is provided with the pipeline, it is characterized in that, throttling arrangement is additionally provided with the pipeline, the size order of the corresponding gaseous species of size order proportion in mixed gas of the minimum net sectional area of the throttling arrangement is consistent or part is consistent, described control circuit includes information data input unit and the control device with information data and program processing function, wherein, information data input unit, the control end of magnetic valve is connected with the control device respectively.
2. high-precision variable proportional gas mixer according to claim 1, it is characterised in that the described control device with information data and program processing function is programmable controller.
3. high-precision variable proportional gas mixer according to claim 2, it is characterised in that it also includes gas mixing ratio detection means.
4. high-precision variable proportional gas mixer according to claim 3, the program of time, the detection information of receiving detection device and the program for being compared with the information that information data input unit is inputted and calculating the program of error and being reset according to error result to program parameter are turned on and off characterized in that, being provided with the information of receive information data input device in described programmable controller and calculating magnetic valve.
5. high-precision variable proportional gas mixer according to claim 1, it is characterised in that the magnetic valve is fluid switching type magnetic valve.
6. high-precision variable proportional gas mixer according to claim 1, it is characterised in that described information data input unit is touch-screen.
7. the method that a kind of any one of use the claims 1 to 6 high-precision variable proportional gas mixer carries out gas mixture at given volumeratio, it is characterised in that：Comprise the following steps：
（1）Throttling arrangement is set in each road pipeline so that the size order of the corresponding gaseous species proportion in mixed gas of the size order of the minimum net sectional area that each road throttling arrangement is constituted is consistent or part is consistent；
（2）Inflation：The mixed proportion of each road gas is inputted in information data input unit, the control device with information data and program processing function is according to the gas ratio of setting, and the corresponding magnetic valve of each road gas phase is controlled by sequential operation is turned on and off the time；
（3）Detect the error amount between mixed gas mixing ratio and the gas mixing ratio of setting；
（4）Round-off error value：The gas ratio that the gas ratio detected in blending tank is inputted with information data input unit has error, and program parameter is reset by control device, and round-off error value, until gas ratio is consistent with the gas mixing ratio set in blending tank；
（5）The different mixing proportion of each road gas is reset, and is at least repeated once above-mentioned（2）、（3）And（4）Step, can obtain the mixed gas of high-precision mixed proportion.
8. the method for gas mixture at given volumeratio according to claim 7, it is characterised in that：The step（2）It is that gas mixing inflation is carried out using inflationtime cycle mixing method.
9. the method for gas mixture at given volumeratio according to claim 7, it is characterised in that：The step（3）It is the ratio that mixed each road gas in blending tank is detected by detection means, and detection information is transferred to the control device, the gas ratio that the control device is set according to information data input unit is compared with detection information, obtains gas mixing ratio error between the two.
10. the method for gas mixture at given volumeratio according to claim 7, it is characterised in that：The control device is programmable controller.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104808571A (en) * | 2015-03-03 | 2015-07-29 | 肖庆 | Fluid multi-pipeline electric controller |
| CN106693736A (en) * | 2015-11-18 | 2017-05-24 | 农业部规划设计研究院 | Biomass pyrolysis carbonization gas mixture distribution method and biomass pyrolysis carbonization gas mixture distribution apparatus |
| CN107120103A (en) * | 2017-05-17 | 2017-09-01 | 成都百联油田技术服务有限公司 | A kind of fracture acidizing cleanup additive |
| CN108159987A (en) * | 2018-02-05 | 2018-06-15 | 南京卡佛科学仪器有限公司 | A kind of triple channel dynamic gas mixing arrangement of double blending tanks |
| CN108295682A (en) * | 2017-12-29 | 2018-07-20 | 苏州森瑞保鲜设备有限公司 | A kind of Gas Ratio Miring Device and open loop ratio mixed method |
| CN112180033A (en) * | 2019-07-04 | 2021-01-05 | 西安西电开关电气有限公司 | Gas mixing device and gas mixing method |
| CN113351120A (en) * | 2021-06-08 | 2021-09-07 | 哈尔滨工业大学 | Gas mixing system and mixing method |
| CN114514486A (en) * | 2019-03-06 | 2022-05-17 | 法国国家科学研究中心 | Microfluidic generator for generating a gaseous mixture |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104808571A (en) * | 2015-03-03 | 2015-07-29 | 肖庆 | Fluid multi-pipeline electric controller |
| CN106693736A (en) * | 2015-11-18 | 2017-05-24 | 农业部规划设计研究院 | Biomass pyrolysis carbonization gas mixture distribution method and biomass pyrolysis carbonization gas mixture distribution apparatus |
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| CN108159987A (en) * | 2018-02-05 | 2018-06-15 | 南京卡佛科学仪器有限公司 | A kind of triple channel dynamic gas mixing arrangement of double blending tanks |
| CN108159987B (en) * | 2018-02-05 | 2020-09-18 | 南京卡佛科学仪器有限公司 | Three-channel dynamic gas mixing device with double mixing tanks |
| CN114514486A (en) * | 2019-03-06 | 2022-05-17 | 法国国家科学研究中心 | Microfluidic generator for generating a gaseous mixture |
| CN112180033A (en) * | 2019-07-04 | 2021-01-05 | 西安西电开关电气有限公司 | Gas mixing device and gas mixing method |
| CN113351120A (en) * | 2021-06-08 | 2021-09-07 | 哈尔滨工业大学 | Gas mixing system and mixing method |
| CN113351120B (en) * | 2021-06-08 | 2022-09-16 | 哈尔滨工业大学 | Gas mixing system and mixing method |
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Application publication date: 20130626 |