CN104316627A - Gas flow automatic display device for gas chromatographic instrument - Google Patents
Gas flow automatic display device for gas chromatographic instrument Download PDFInfo
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- CN104316627A CN104316627A CN201410624390.XA CN201410624390A CN104316627A CN 104316627 A CN104316627 A CN 104316627A CN 201410624390 A CN201410624390 A CN 201410624390A CN 104316627 A CN104316627 A CN 104316627A
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Abstract
The invention discloses a gas flow automatic display device for a gas chromatographic instrument. The device is characterized by comprising a first gear (1), wherein the first gear (1) is mounted on a control rod (201) of a needlelike pressure stabilizing valve (2), the flow of the needlelike pressure stabilizing valve (2) can be controlled by rotation of the control rod (201), the first gear (1) is meshed with a second gear (3), the second gear (3) is mounted on a linkage rod (401) of a synchronous potentiometer (4), and the voltage of the synchronous potentiometer (4) can be controlled by rotation of the linkage rod (401). According to the device provided by the invention, the gas flow value is converted into a corresponding voltage signal, and the voltage signal is automatically displayed through the display device; the gas flow monitoring accuracy of the gas chromatographic instrument is improved.
Description
Technical field
The present invention relates to technical field of analytical instruments, specifically just relate to a kind of gas chromatograph gas flow automatic display unit.
Background technology
Gas chromatograph is the instrument by vapor-phase chromatography, material being carried out to qualitative and quantitative analysis, be used for carrying out analysis to each component in mixed gas to detect, gas chromatograph is a kind of separation, analysis tool of many mixture, it take gas as mobile phase, adopts the Column chromatography techniques of douche.When the amalyzing substances of many components enters into chromatographic column, because each component gas phase is in the chromatography column different with the partition factor between immobile liquid liquid phase, therefore each component is also just different in the travelling speed of chromatographic column, after certain column length, order is left chromatographic column and is entered detecting device, be converted to electric signal after testing afterwards and deliver to data processing stations, thus complete the qualitative and quantitative analysis to measured matter.Gas chromatograph is applied very wide in oil, chemical industry, biological chemistry, medical and health, food industry, environmental protection etc.It is except for quantitatively and except qualitative analysis, can also the physicochemical constant such as the partition factor of working sample on Stationary liquid, activity coefficient, molecular weight and specific surface area.
Gas chromatograph system comprises five large ingredients: air-channel system, sampling system, piece-rate system, temperature control system and detection record system, in its air-channel system, gas flow controls to be unusual factor in gas chromatographic analysis, and traditional gas chromatograph adopts needle valve to carry out gas flow control to instrument usually.The easy installation and removal of machinery needle valve, connect fastening, good airproof performance, long service life, response speed also than comparatively fast, is widely adopted in current gas chromatograph.Its principle of work be when needle be opened into certain position and gas access and top hole pressure constant time, rate of discharge is then constant.If needle position is certain and inlet pressure is constant, when top hole pressure changes, the pressure reduction between the entrance of needle and outlet changes, and the acting force namely on diaphragm changes, gap between silicon rubber valve gap and valve seat becomes large or diminishes, and gas flow is maintained at set-point.The inlet pressure of existing flow stabilizing valve is generally no more than 0.25Mpa.Top hole pressure controls when 0.02-0.2Mpa, the steady flow result that can obtain.
Needle-like pressure maintaining valve is mainly in order to the pressure of stable carrier gas or combustion gas, conventional is corrugated tube bicavate pressure maintaining valve, and two cavitys are connected, when valve opened by adjusting handle by the gap of trace by hole, system reaches balance, rise if inlet pressure has had or decline, the air pressure of another cavity increases thereupon or reduces, and corrugated tube is upheld to the right or left, needle moves simultaneously, therefore gas-flow resistance strengthens or reduces, then top hole pressure falls and is back to original state, thus reaches the effect of voltage stabilizing.
Needle-like pressure maintaining valve is used to regulate carrier gas flux or gas flow.The lower end of the valve rod of needle valve is sharp cone distal and needle, controls flow by the relative position changing needle and valve.When rotating counterclockwise, the gap of needle and valve becomes greatly, and air resistance diminishes, and gas flow increases.Needle should be made when needle valve does not work to be totally released, to prevent needle valve O-ring seal to be bonded at valve inlet place and prevent the long-term pressurized of stage clip to lose efficacy.
At present these numerical values recited controlling the valve of gas chromatograph gas flows are all scale displays, and scale value only represents the number of turns from starting point position needs rotation up till now, and uninterrupted corresponding to such number of turns can not intuitively be found out.Be generally provide a table of comparisons, corresponding flow can be found in the table of comparisons.Cannot automatically show gas chromatograph gas flow numerical value intuitively.
Summary of the invention
The object of the invention is to read in real time for existing gas chromatograph gas flow can only by just getable technological deficiency of tabling look-up, a kind of gas chromatograph gas flow automatic display unit is provided, gas flow values is converted to corresponding voltage signal, is automatically shown by display device.Improve the accuracy of gas chromatograph gas flow monitoring.
Technical scheme
In order to realize above-mentioned technical purpose, the present invention designs a kind of gas chromatograph gas flow automatic display unit, it is characterized in that: it comprises the first gear, first gear is contained on the control lever of aciculiform pressure maintaining valve, the rotation of control lever can control the size of aciculiform pressure maintaining valve flow, first gear and the second gears meshing, the second gear is contained in the gangbar of synchronizing potential device, and the rotation of gangbar can the magnitude of voltage of control synchronization potentiometer;
Described aciculiform pressure maintaining valve and synchronizing potential device are arranged on pedestal, there is power supply in the described synchronizing potential device external world, described power supply and synchronizing potential device connecting circuit are serially connected with resistance, resistance and synchronizing potential device link position are connected on one end of amplifier, the another two ends of amplifier are parallel with shunt resistance, the output terminal of amplifier is connected to the analog to digital conversion mouth of single-chip microcomputer, a point pressure side for amplifier is connected with divider resistance, divider resistance one end ground connection, synchronizing potential device wire resistor circle one end ground connection, described single-chip microcomputer is connected with numerical display device, flowmeter is equipped with in the outlet side of described aciculiform pressure maintaining valve.
Further, the resistance of described synchronizing potential device is 2.2 kilo-ohms.
Further, the gear ratio of described first gear and the second gear is 1:1.
Beneficial effect
The invention provides a kind of gas chromatograph gas flow automatic display unit, gas flow values is converted to corresponding voltage signal, is automatically shown by display device.Improve the accuracy of gas chromatograph gas flow monitoring.
Accompanying drawing explanation
Accompanying drawing 1 is aciculiform pressure maintaining valve and synchronizing potential device scheme of installation in the present invention.
Accompanying drawing 2 is annexation schematic diagram of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the present invention will be further described.
Embodiment
As shown in figure 1 and 2, a kind of gas chromatograph gas flow automatic display unit, it is characterized in that: it comprises the first gear 1, first gear 1 is contained on the control lever 201 of aciculiform pressure maintaining valve 2, the rotation of control lever 201 can control the size of aciculiform pressure maintaining valve 2 flow, first gear 1 engages with the second gear 3, and the second gear 3 is contained in the gangbar 401 of synchronizing potential device 4, and the rotation of gangbar 401 can the magnitude of voltage of control synchronization potentiometer 4;
Described aciculiform pressure maintaining valve 2 and synchronizing potential device 4 are arranged on pedestal 5, there is power supply 6 in described synchronizing potential device 4 external world, described power supply 6 and synchronizing potential device 4 connecting circuit are serially connected with resistance 7, resistance 7 and synchronizing potential device 4 link position are connected on one end of amplifier 8, the another two ends of amplifier 8 are parallel with shunt resistance 9, the output terminal of amplifier 8 is connected to the analog to digital conversion mouth of single-chip microcomputer 10, a point pressure side for amplifier 8 is connected with divider resistance 11, divider resistance 11 one end ground connection, synchronizing potential device 4 wire resistor circle one end ground connection, described single-chip microcomputer 10 is connected with numerical display device 12, flowmeter is equipped with in the outlet side of described aciculiform pressure maintaining valve 2.
The resistance of described synchronizing potential device 4 is 2.2 kilo-ohms.
The gear ratio of described first gear 1 and the second gear is 1:1.
The course of work of the present invention first flow valve is transferred to 10ml/min position, then turns down 0ml/min, then close half-turn to little direction, according to the sense of rotation of gear, potentiometer is screwed to minimum position, then turns half-turn in the other direction, then install synchromesh gear and complete installation.Then single-chip microcomputer enters debugging mode work, first voltage conversion value when reading flow is 0ml/min, the condition now read is that the flow of test counts 0lm/min, this inputs 0.00 on the touchscreen, then the confirmation button on point touching screen, now data will be stored in the internal memory of single-chip microcomputer.Second step adjust flux valve, the reading making flowmeter is 30ml/min, after waiting stability of flow, inputs 30.00 on the touchscreen, then stores second data by acknowledgement key.Repeat step above, the data of correspondence are stored like this.In single-chip microcomputer, so just just there is the bidimensional table of a flow and voltage.There is this table just can obtain the flow value that in corresponding scope, any magnitude of voltage is corresponding, even if debugging completes like this.So finally reset single-chip microcomputer, enters normal mode of operation, and adjust flux valve just directly can read corresponding flow value from screen, just can normally employ.
Claims (3)
1. a gas chromatograph gas flow automatic display unit, it is characterized in that: it comprises the first gear (1), first gear (1) is contained on the control lever (201) of aciculiform pressure maintaining valve (2), the rotation of control lever (201) can control the size of aciculiform pressure maintaining valve (2) flow, first gear (1) engages with the second gear (3), second gear (3) is contained in the gangbar (401) of synchronizing potential device (4), and the rotation of gangbar (401) can the magnitude of voltage of control synchronization potentiometer (4);
Described aciculiform pressure maintaining valve (2) and synchronizing potential device (4) are arranged on pedestal (5), there is power supply (6) in described synchronizing potential device (4) external world, described power supply (6) and synchronizing potential device (4) connecting circuit are serially connected with resistance (7), resistance (7) and synchronizing potential device (4) link position are connected on one end of amplifier (8), the another two ends of amplifier (8) are parallel with shunt resistance (9), the output terminal of amplifier (8) is connected to the analog to digital conversion mouth of single-chip microcomputer (10), a point pressure side for amplifier (8) is connected with divider resistance (11), divider resistance (11) one end ground connection, synchronizing potential device (4) wire resistor circle one end ground connection, described single-chip microcomputer (10) is connected with numerical display device (12), flowmeter is equipped with in the outlet side of described aciculiform pressure maintaining valve (2).
2. a kind of gas chromatograph gas flow automatic display unit as claimed in claim 1, is characterized in that: the resistance of described synchronizing potential device (4) is 2.2 kilo-ohms.
3. a kind of gas chromatograph gas flow automatic display unit as claimed in claim 1, is characterized in that: the gear ratio of described first gear (1) and the second gear is 1:1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410624390.XA CN104316627A (en) | 2014-11-06 | 2014-11-06 | Gas flow automatic display device for gas chromatographic instrument |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410624390.XA CN104316627A (en) | 2014-11-06 | 2014-11-06 | Gas flow automatic display device for gas chromatographic instrument |
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| CN104316627A true CN104316627A (en) | 2015-01-28 |
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| CN201410624390.XA Pending CN104316627A (en) | 2014-11-06 | 2014-11-06 | Gas flow automatic display device for gas chromatographic instrument |
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Citations (11)
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| JPS5638755A (en) * | 1979-09-05 | 1981-04-14 | Mitsubishi Electric Corp | Sample location displaying device |
| US4465063A (en) * | 1982-05-25 | 1984-08-14 | University Of Utah | Cardiac flow measurement system and method |
| JP2000019165A (en) * | 1998-06-30 | 2000-01-21 | Shimadzu Corp | Gas chromatograph |
| CN2524265Y (en) * | 2001-12-26 | 2002-12-04 | 中国石化集团齐鲁石油化工公司 | Self-control microliquid delivery device |
| CN101468224A (en) * | 2007-12-29 | 2009-07-01 | 北京谊安医疗系统股份有限公司 | Flow regulating and controlling valve |
| CN202392137U (en) * | 2011-12-22 | 2012-08-22 | 滕州市滕海分析仪器有限公司 | Chromatography pressure stabilization valve |
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| CN202948336U (en) * | 2012-10-29 | 2013-05-22 | 陶兴建 | Fluid position display controller |
| CN203552079U (en) * | 2013-11-28 | 2014-04-16 | 杭州捷岛科学仪器有限公司 | Automatic flow control valve |
| CN204177777U (en) * | 2014-11-06 | 2015-02-25 | 上海仪电分析仪器有限公司 | Gas chromatograph gas flow automatic display unit |
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2014
- 2014-11-06 CN CN201410624390.XA patent/CN104316627A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3636763A (en) * | 1968-05-17 | 1972-01-25 | Nat Res Dev | Measurement of the flow of particulate material |
| JPS5638755A (en) * | 1979-09-05 | 1981-04-14 | Mitsubishi Electric Corp | Sample location displaying device |
| US4465063A (en) * | 1982-05-25 | 1984-08-14 | University Of Utah | Cardiac flow measurement system and method |
| JP2000019165A (en) * | 1998-06-30 | 2000-01-21 | Shimadzu Corp | Gas chromatograph |
| CN2524265Y (en) * | 2001-12-26 | 2002-12-04 | 中国石化集团齐鲁石油化工公司 | Self-control microliquid delivery device |
| CN101468224A (en) * | 2007-12-29 | 2009-07-01 | 北京谊安医疗系统股份有限公司 | Flow regulating and controlling valve |
| CN202433366U (en) * | 2011-12-21 | 2012-09-12 | 成都众询科技有限公司 | Simple intelligent online gas monitoring system |
| CN202392137U (en) * | 2011-12-22 | 2012-08-22 | 滕州市滕海分析仪器有限公司 | Chromatography pressure stabilization valve |
| CN202948336U (en) * | 2012-10-29 | 2013-05-22 | 陶兴建 | Fluid position display controller |
| CN203552079U (en) * | 2013-11-28 | 2014-04-16 | 杭州捷岛科学仪器有限公司 | Automatic flow control valve |
| CN204177777U (en) * | 2014-11-06 | 2015-02-25 | 上海仪电分析仪器有限公司 | Gas chromatograph gas flow automatic display unit |
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| 冯振伟 等: "智能涡轮流量计的设计", 《华北水利水电学院学报》 * |
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