CN108508120B - Quantitative air inlet device for transformer oil chromatographic online monitoring system - Google Patents
Quantitative air inlet device for transformer oil chromatographic online monitoring system Download PDFInfo
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- CN108508120B CN108508120B CN201810323669.2A CN201810323669A CN108508120B CN 108508120 B CN108508120 B CN 108508120B CN 201810323669 A CN201810323669 A CN 201810323669A CN 108508120 B CN108508120 B CN 108508120B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
- G01N30/04—Preparation or injection of sample to be analysed
- G01N30/16—Injection
- G01N30/20—Injection using a sampling valve
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
- G01N30/04—Preparation or injection of sample to be analysed
- G01N30/16—Injection
- G01N30/20—Injection using a sampling valve
- G01N2030/201—Injection using a sampling valve multiport valves, i.e. having more than two ports
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- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
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- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
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- Pathology (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention discloses a quantitative air inlet device for an online monitoring system of transformer oil chromatography, wherein a first two-position three-way electromagnetic valve, a second two-position three-way electromagnetic valve and an electric plane valve are fixed on a substrate, a first air passage communicated with a first through hole of the first two-position three-way electromagnetic valve and an inlet of a metering tube, a second air passage communicated with a first through hole of the second two-position three-way electromagnetic valve and an outlet of the metering tube, a third air passage communicated with a connecting port of a degassing device and the first air passage, a fourth air passage communicated with a connecting port of a chromatographic column and a second through hole of the second two-position three-way electromagnetic valve, a fifth air passage communicated with a carrier gas connecting port and the second through hole of the first two-position three-way electromagnetic valve, a sixth air passage communicated with an air hole of the electric plane valve are arranged in the substrate, the second through hole of the electric plane valve is communicated with the second air passage, and the third through hole of the first two-position three-way electromagnetic valve is communicated with the third through hole of the second two-position three-way electromagnetic valve.
Description
Technical Field
The invention relates to a quantitative air inlet device for a transformer oil chromatographic online monitoring system, in particular to a quantitative air inlet device for a transformer oil chromatographic online monitoring system, which can improve pressure resistance and detection accuracy.
Background
The transformer oil chromatographic online monitoring system is a device for measuring the component content of dissolved gas in the transformer oil in real time by adopting a gas chromatography method, aims to avoid faults such as transformer oil overheating and discharging, and is one of means for guaranteeing safe and effective operation of a power grid. The transformer oil chromatographic online monitoring system needs a quantitative air inlet device to quantitatively determine the air in the transformer oil, and then enters a chromatographic column of a gas chromatograph for subsequent analysis. The quantitative air inlet device for the existing transformer oil chromatographic online monitoring system mainly comprises a six-way valve and a normally-closed two-way electromagnetic valve. The six-way valve is provided with an interface connected with the transformer degassing device, the gas metering tube, the carrier gas and the chromatographic column, and is connected with the air outlet through the normally closed two-way electromagnetic valve. The first state of the six-way valve is that the degasser, the gas metering tube, the normally closed two-way electromagnetic valve and the air inlet are communicated, and the carrier gas is communicated with the chromatographic column. The carrier gas is now connected to the chromatographic column through a six-way valve; the method comprises the steps that the degassing device conveys gas separated from transformer oil to a quantitative pipe, a normally closed two-way valve (closed) is isolated from a counter-air port (atmosphere), the gas to be analyzed is compressed into the quantitative pipe by the degassing device, and then the valve connected with the six-way valve is closed by the degassing device, so that the gas with certain pressure is sealed in the quantitative pipe; and then opening the normally-closed two-way electromagnetic valve to release the gas pressure in the six-way valve to be equal to the atmospheric pressure, and then closing the normally-closed two-way electromagnetic valve to finish the quantification of the gas in the transformer oil. The second state of the six-way valve is that the carrier gas, the gas quantitative tube and the chromatographic column are communicated, and the carrier gas pushes the gas to be analyzed in the gas quantitative tube into the chromatographic column, so that the detection of the gas in the transformer oil is completed. Because the pressure resistance of the six-way valve is limited, the vacuum state cannot be formed before the sample injection of the quantitative pipe, and the purity of the gas sample is affected by residual air, so that the detection precision is directly reduced. In addition, the six-way valve has the problems of complex structure, high cost, poor operation reliability and the like.
Disclosure of Invention
The invention aims to solve the technical problems in the prior art and provides the quantitative air inlet device for the transformer oil chromatographic online monitoring system, which can improve the pressure resistance and the detection precision.
The technical scheme of the invention is as follows: the quantitative air inlet device for the transformer oil chromatographic online monitoring system comprises a substrate, wherein a degassing device connector, a quantitative pipe inlet, a quantitative pipe outlet, an opposite air port, a chromatographic column connector and a carrier gas connector are arranged on the substrate, a first two-position three-way electromagnetic valve, a second two-position three-way electromagnetic valve and an electric plane valve are fixed on the substrate, a first air passage communicated with the first through hole of the first two-position three-way electromagnetic valve and the inlet of the metering pipe, a second air passage communicated with the first through hole of the second two-position three-way electromagnetic valve and the outlet of the metering pipe, a third air passage communicated with the degassing device connector and the first air passage, a fourth air passage communicated with the chromatographic column connector and the second through hole of the second two-position three-way electromagnetic valve, a fifth air passage communicated with the carrier gas connector and the second through hole of the first two-position three-way electromagnetic valve and a sixth air passage communicated with the first through hole of the electric plane valve are arranged in the substrate, and the second through hole of the first two-position three-way electromagnetic valve is communicated with the second through hole of the electric plane valve.
The invention adopts the base body and a plurality of electromagnetic valve control air paths to replace the existing six-way valve, has compact integral structure and small cavity (little residual gas), reduces the production cost and improves the operation reliability. Particularly, the pressure resistance is greatly improved, the vacuum state can be formed before the sample injection of the metering tube, the influence of residual air on the purity of the gas sample is avoided, and the detection precision is improved.
Drawings
Fig. 1 is a schematic structural view of an embodiment of the present invention.
Fig. 2 is A-A view of fig. 1.
Detailed Description
The quantitative air inlet device for the transformer oil chromatographic online monitoring system is shown in fig. 1 and 2: the base body 1 is provided with a degassing device connection port 2, a quantitative pipe inlet 3, a quantitative pipe outlet 4, an empty port 5, a chromatographic column connection port 6 and a carrier gas connection port 7 as in the prior art, unlike the prior art, a first two-position three-way electromagnetic valve 8, a second two-position three-way electromagnetic valve 9 and an electric plane valve 10 are fixed on the base body 1, a first air passage 11 which is communicated with the first through hole 8-1 of the first two-position three-way electromagnetic valve 8 and the first air passage 11 of the metering pipe inlet 3, a second air passage 12 which is communicated with the first through hole 9-1 of the second two-position three-way electromagnetic valve 9 and the metering pipe outlet 4, a third air passage 13 which is communicated with the degassing device connection port 2 and the first air passage 11, a fourth air passage 14 which is communicated with the chromatographic column connection port 6 and the second through hole 9-2 of the second two-position three-way electromagnetic valve 8, a fifth air passage 15 which is communicated with the carrier gas connection port 7 and the second through hole 8-2 of the first two-position three-way electromagnetic valve 8, and a sixth air passage 16 which is communicated with the first through hole 10-1 of the electric plane valve 10 are arranged in the base body 1, and the second air passage 10 is communicated with the second through hole 10-2 of the second three-way electromagnetic valve 2 and the second through hole 10 is communicated with the second through hole 8-3. The second through hole is communicated with the third through hole when the first two-position three-way electromagnetic valve 8 and the second two-position three-way electromagnetic valve 9 are electrified, and the first through hole is communicated with the second through hole when the power is off; the two through holes are conducted when the electric plane valve 10 is electrified and are closed when the electric plane valve is powered off.
The working process is as follows:
in the same way as the prior art, the degassing device connection port 2 is connected with the transformer oil degassing device, the quantitative pipe inlet 3 and the quantitative pipe outlet 4 are connected with the quantitative pipe, and the chromatographic column connection port 6 and the carrier gas connection port 7 are respectively connected with the chromatographic column and the carrier gas.
(1) First state: the first two-position three-way electromagnetic valve 8 and the second two-position three-way electromagnetic valve 9 are electrified, the second through hole 8-2 of the first two-position three-way electromagnetic valve 8 is communicated with the third through hole 8-3, and the second through hole 9-2 of the second two-position three-way electromagnetic valve 9 is communicated with the third through hole 9-3; the electric flat valve 10 is powered off, and the first through hole 10-1 and the second through hole 10-2 are closed. At this time, the carrier gas enters the chromatographic column through the fifth gas path 15, the second through hole 8-2 and the third through hole 8-3 of the first two-position three-way electric plane valve 8, the second through hole 9-2 and the third through hole 9-3 of the second two-position three-way electromagnetic valve 9 and the fourth gas path 14; vacuumizing the quantitative tube by using a degasser, closing a valve between the degasser and a connecting port 2 of the degasser, keeping the quantitative tube in a vacuum state, then degassing by the degasser, opening the valve between the degasser and the connecting port 2 of the degasser, compressing the gas to be analyzed into the quantitative tube, closing the valve between the degasser and the connecting port 2 of the degasser, and sealing the gas to be analyzed with a certain pressure in the quantitative tube.
(2) Second state: the first two-position three-way electromagnetic valve 8 and the second two-position three-way electromagnetic valve 9 are electrified, and the carrier gas enters the chromatographic column in the same state as the first state; the electric plane valve 10 is energized, the first through hole 10-1 is communicated with the second through hole 10-2 and is communicated with the atmosphere (about 8 seconds for air), and the state is an equilibrium state for balancing the pressure in the metering tube and releasing the redundant pressure. Since the pressure inside the dosing tube is consistent with the external atmospheric pressure and the volume is fixed, it is ensured that the gas content inside the dosing tube remains substantially consistent over several operations.
(3) The first two-position three-way electromagnetic valve 8 and the second two-position three-way electromagnetic valve 9 are powered off, the first through hole 8-2 of the first two-position three-way electromagnetic valve 8 is communicated with the first through hole 8-1, and the second through hole 9-2 of the second two-position three-way electromagnetic valve 9 is communicated with the first through hole 9-1; the electric flat valve 10 is powered off, and the first through hole 10-1 and the second through hole 10-2 are closed. At this time, the carrier gas pushes the gas to be analyzed which is already quantified in the quantifying tube into the chromatographic column, and the quantitative sample feeding work is completed.
Claims (1)
1. The utility model provides a transformer oil chromatographic online monitoring system is with quantitative air inlet unit which characterized in that: the device comprises a substrate (1), wherein the substrate (1) is provided with a degassing device connector (2), a quantitative pipe inlet (3), a quantitative pipe outlet (4), a butt air port (5), a chromatographic column connector (6) and a carrier gas connector (7), and is characterized in that: a first two-position three-way electromagnetic valve (8), a second two-position three-way electromagnetic valve (9) and an electric plane valve (10) are fixed on the base body (1),
the device comprises a substrate (1), a first gas passage (11) communicated with a first through hole (8-1) of a first two-position three-way electromagnetic valve (8) and a quantitative pipe inlet (3), a second gas passage (12) communicated with a first through hole (9-1) of a second two-position three-way electromagnetic valve (9) and a quantitative pipe outlet (4), a third gas passage (13) communicated with a degassing device connecting port (2) and the first gas passage (11), a fourth gas passage (14) communicated with a chromatographic column connecting port (6) and a second through hole (9-2) of the second two-position three-way electromagnetic valve (9), a fifth gas passage (15) communicated with a carrier gas connecting port (7) and a second through hole (8-2) of the first two-position three-way electromagnetic valve (8) and a sixth gas passage (16) communicated with a first through hole (10-1) of an empty port (5) and an electric plane valve (10) are arranged in the substrate (1), the second through hole (10-2) of the electric plane valve (10) is communicated with the second gas passage (12), and the third through hole (8-3 of the first two-position three-way electromagnetic valve (8) is communicated with the second two-position three-electromagnetic valve (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810323669.2A CN108508120B (en) | 2018-04-12 | 2018-04-12 | Quantitative air inlet device for transformer oil chromatographic online monitoring system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810323669.2A CN108508120B (en) | 2018-04-12 | 2018-04-12 | Quantitative air inlet device for transformer oil chromatographic online monitoring system |
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| Publication Number | Publication Date |
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| CN108508120A CN108508120A (en) | 2018-09-07 |
| CN108508120B true CN108508120B (en) | 2023-09-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810323669.2A Active CN108508120B (en) | 2018-04-12 | 2018-04-12 | Quantitative air inlet device for transformer oil chromatographic online monitoring system |
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| CN (1) | CN108508120B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109425678B (en) * | 2018-11-16 | 2020-09-18 | 许继集团有限公司 | Gas quantitative sampling device and gas chromatography detection system |
| CN109655547A (en) * | 2018-12-29 | 2019-04-19 | 山东玉皇化工有限公司 | A kind of device and method of gas chromatograph detection exhaust gas component and real-time traffic |
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| JPS55114933A (en) * | 1979-02-28 | 1980-09-04 | Toshiba Corp | Gas extraction unit |
| JP2000241401A (en) * | 1999-02-25 | 2000-09-08 | Aichi Electric Co Ltd | Analyzing device for gas in electrical insulating oil |
| US6718817B1 (en) * | 2002-11-22 | 2004-04-13 | Chung-Shan Institute Of Science And Technology | Sample injection device for gas chromatography |
| CN101620212A (en) * | 2009-06-05 | 2010-01-06 | 杭州超距科技有限公司 | Gas automatic quantitive sampling device |
| CN201425590Y (en) * | 2009-06-05 | 2010-03-17 | 许坤 | Vacuum degassing device for insulating oil on-line chromatographic analysis |
| CN205484231U (en) * | 2016-02-03 | 2016-08-17 | 辽宁华科石油设备科技有限公司 | Gas distributor |
| CN208313913U (en) * | 2018-04-12 | 2019-01-01 | 大连世有电力科技有限公司 | The quantitative inlet duct of chromatography online monitoring system for transformer oil |
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2018
- 2018-04-12 CN CN201810323669.2A patent/CN108508120B/en active Active
Patent Citations (8)
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| SU724973A1 (en) * | 1978-07-13 | 1980-03-30 | Всесоюзный научно-исследовательский институт природных газов | Device for gas sampling from liquid |
| JPS55114933A (en) * | 1979-02-28 | 1980-09-04 | Toshiba Corp | Gas extraction unit |
| JP2000241401A (en) * | 1999-02-25 | 2000-09-08 | Aichi Electric Co Ltd | Analyzing device for gas in electrical insulating oil |
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| CN101620212A (en) * | 2009-06-05 | 2010-01-06 | 杭州超距科技有限公司 | Gas automatic quantitive sampling device |
| CN201425590Y (en) * | 2009-06-05 | 2010-03-17 | 许坤 | Vacuum degassing device for insulating oil on-line chromatographic analysis |
| CN205484231U (en) * | 2016-02-03 | 2016-08-17 | 辽宁华科石油设备科技有限公司 | Gas distributor |
| CN208313913U (en) * | 2018-04-12 | 2019-01-01 | 大连世有电力科技有限公司 | The quantitative inlet duct of chromatography online monitoring system for transformer oil |
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| CN108508120A (en) | 2018-09-07 |
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