CN102049397A - Method and device for cleaning capillary of automatic sampler - Google Patents
Method and device for cleaning capillary of automatic sampler Download PDFInfo
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- CN102049397A CN102049397A CN200910198412XA CN200910198412A CN102049397A CN 102049397 A CN102049397 A CN 102049397A CN 200910198412X A CN200910198412X A CN 200910198412XA CN 200910198412 A CN200910198412 A CN 200910198412A CN 102049397 A CN102049397 A CN 102049397A
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Abstract
The invention discloses a method for cleaning a capillary of an automatic sampler, which comprises the following steps of: sucking cleaning solution at normal pressure into a temporary container from a cleaning solution container by utilizing negative pressure; and pressurizing the cleaning solution in the temporary container, and washing the capillary to be cleaned by using the pressurized cleaning solution. A device for implementing the cleaning method comprises an open mouthed cleaning solution cup, a reciprocating piston pump and a three-way change valve, wherein the three-way change valve is arranged among the cleaning solution cup, the reciprocating piston pump and the capillary; valve ports of the three-way change valve are respectively connected with a working cavity of the reciprocating piston pump, the cleaning solution cup and the capillary without leakage; and the three-way change valve has two working positions, namely the working cavity of the reciprocating piston pump can be communicated with the cleaning solution cup, and the working cavity of the reciprocating piston pump can be communicated with the capillary. The method and the device avoid extra pressure gas, electromagnetic valves and pressure regulating valves, and do not need a cleaning solution container with good sealing property and high pressure resistance; and the device is simple in structure, convenient to transform and low in maintenance cost.
Description
Technical field
The present invention relates to a kind of cleaning method and device, relate in particular to and clean automatic sampler method capillaceous and device.
Background technology
Modern GFAAS has become the important method that micro-example analysis and trace, ultratrace element detect.Sampling Graphite Furnace Atomicization is occupied very consequence in atomic absorption spectroscopy, when using atomic absorption spectrophotometer that the concentration of sample solution is measured, the volumetric errors of institute's sample thief directly has influence on precision of measurement.Generally, can use have automatic sampler capillaceous by volume required draw samples to reach higher precision.
But, after having extracted a kind of sample, if when continue using the capillary of having used to extract the variable concentrations sample, capillary might cross pollution, thereby make measured value can't reflect real sample solution concentration, must clean capillary before therefore each draw samples.At present, what cleaning method capillaceous generally adopted in the automatic sampler is pneumatic process: utilize pressed gas that cleaning fluid is extruded from container and flow through capillary, thereby reach the cleaning purpose.The air pressure ablution requires additionally to provide magnetic valve, the pressure regulator valve of pressed gas and controlled pressure gas, the apparatus structure complexity, and high to air-tightness, the barotolerance requirement of soda liquor container, need often maintain, change, the cost that device is safeguarded is higher.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of automatic sampler capillary that is used to clean, additionally working pressure gas and corresponding control device, need not the method for high pressure resistant soda liquor container and can realize the device of said method.
The present invention is achieved by the following technical solutions:
A kind of cleaning automatic sampler method capillaceous, it is characterized in that: described method was divided into for two steps:
The first step utilizes negative pressure that the cleaning fluid under the normal pressure is pumped into from soda liquor container in the temporary container;
In second step, the cleaning fluid pressurization to storing in the temporary container utilizes pressure wash liquid to wash away capillary to be cleaned.
Utilize the cleaning fluid under the negative pressure suction normal pressure, need not extra pressed gas, suction power and temporary container can utilize the sampling power and the related device of existing automatic sampler to realize, and owing to need not high voltage bearing soda liquor container, cleaning device can further be simplified, and cleans cost thereby reduce.
In addition, the dynamics of washing away when cleaning, reach cleaning performance preferably, the cleaning pressure of pressure wash liquid is preferably 0.2Mpa.
Generally, graphite furnace automatic sampler length capillaceous is generally 500~800mm, internal diameter is 0.5mm, therefore its volume is about about 0.1ml,, for guaranteeing cleaning performance, being pumped in the reciprocating piston pump during each the cleaning, being used to clean cleaning fluid volume capillaceous is 0.3~0.8ml, during cleaning, because the promotion of piston, the cleaning fluid of suction can all be discharged from capillary, can not remain in the capillary.
A kind of device that can realize above-mentioned cleaning automatic sampler capillary method, it is characterized in that: described device comprises uncovered cleaning fluid cup, reciprocating piston pump and three-way diverter valve, three-way diverter valve is arranged between cleaning fluid cup, reciprocating piston pump and the capillary, its valve port is connected with working chamber, cleaning fluid cup and the capillary ne-leakage of reciprocating piston pump respectively, three-way diverter valve has two operating positions, can select the working chamber of reciprocating piston pump to be connected with the cleaning fluid cup, perhaps the working chamber of reciprocating piston pump is connected with capillary.
Wherein, reciprocating piston pump is the sampling dynamical element that automatic sampler carries, and utilizes reciprocating piston pump sample extraction can be gone in the capillary, and after this mobile capillary utilizes reciprocating piston pump will inhale sample again and releases capillary to the application of sample mouth, can finish application of sample.Sampling and during application of sample, the operating position at three-way diverter valve place only is connected the working chamber of reciprocating piston pump with capillary, with guarantee to take a sample, application of sample is abundant.During cleaning, three-way diverter valve changes the operating position, the working chamber of reciprocating piston pump is connected with the cleaning fluid cup, utilize reciprocating piston pump the cleaning fluid in the uncovered cleaning fluid cup to be sucked the working chamber of reciprocating piston pump, three-way diverter valve is returned to the position that the working chamber of reciprocating piston pump is connected with capillary then, reciprocating piston pump is to the pressurization of the cleaning fluid in the suction chamber, and pressurized washing liquid sprays from capillary, finishes cleaning capillaceous.
Further, three-way diverter valve can be solenoid directional control valve, electro-hydraulic reversing valve or motor-driven reversal valve, considers arrangement convenience, compact conformation on existing equipment, preferably adopts solenoid directional control valve.
For do not change the existing layout of automatic sampler as far as possible, be beneficial to replacement to existing cleaning device, a kind of preferred cleaning device arrangement is: solenoid directional control valve is
Shape arranges that wherein, the valve port that solenoid directional control valve makes progress communicates with reciprocating piston pump, and two following valve ports communicate with capillary and cleaning fluid cup respectively.
For making full use of suction, the ejection that cleaning fluid self flows, is convenient to cleaning fluid, a kind of preferred cleaning device arrangement is: solenoid directional control valve is
Shape arranges that wherein, the valve port that solenoid directional control valve makes progress communicates with the bottom of cleaning fluid cup, and middle valve port communicates with reciprocating piston pump, and following valve port communicates with capillary.
Further, be the automation that realizes cleaning, can be with three-way diverter valve, reciprocating piston pump, capillary all by motor-driven, so that under uncared for situation by control system control, the graphite furnace automatic sampler still can be realized taking a sample automatically, cleaning under the control of control system.
In addition, consider capillary after some sample is taken a sample, could thoroughly clean through repeatedly washing away possibly that it is adjustable therefore can being set in interior wash number of each cleaning frequency, when needs repeatedly clean, can select suitable wash number.
Beneficial effect of the present invention is:
1. this method and device additionally working pressure gas, magnetic valve, pressure regulator valve, device simple in structure;
2. this method and device do not need the good and high voltage bearing soda liquor container of sealing, just can realize cleaning capillaceous, and the cost of device maintaining is low;
3. this device sampling dynamical element of having utilized automatic sampler to carry is realized cleaning function, and it is convenient to transform, and improvement cost is low.
4. the wash number of this device is adjustable, can select suitable wash number as required.
Description of drawings
The apparatus structure schematic diagram that Fig. 1 cleans for existing pneumatic process
Fig. 2 is cleaning device of the present invention working state schematic representation when suck purge liquid
Fig. 3 is cleaning device of the present invention working state schematic representation when washing capillary
Fig. 4 is a kind of preferred arrangements structure chart of cleaning device of the present invention
Among Fig. 1-4: 1 is capillary, and 2 is motor, and 3 is reciprocating piston pump, 4 is three-way connection, and 5 is magnetic valve, and 6 is pressure regulator valve, 7 is control system, 8 is the pressed gas producing component, and 9 is sealed high pressure cleaning fluid bottle, and 10 is the application of sample mouth, 11 is service sink, 12 is specimen cup, and 13 is the cleaning fluid cup, and 14 is three-way diverter valve.
The specific embodiment
The invention will be further described below in conjunction with accompanying drawing.
Among Fig. 1-4, capillary 1 is driven, can be moved around and lifting between specimen cup 12, service sink 11 and application of sample mouth 10 by the motor 2 of control system 7 controls.The piston of reciprocating piston pump 3 is driven by the motor 2 of control system 7 control and moves reciprocatingly, can be capillary 1 in, promptly inhale sample sample extraction, or release capillary 1, be application of sample.
Existing pneumatic process is cleaned device capillaceous and is comprised sealed high pressure cleaning fluid bottle 9, magnetic valve 5, pressure regulator valve 6, pressed gas producing component 8 and three-way connection 4, during sampling, closes magnetic valve 5, pressure regulator valve 6, and the push-and-pull campaign of reciprocating pump 3 pistons can be inhaled sample and application of sample.Behind the application of sample, open magnetic valve 5, pressure regulator valve 6, pressed gas producing component 8 produces gases at high pressure, cleaning fluid is extruded and flows through capillary 1 to reach the cleaning purpose from sealed high pressure cleaning fluid bottle 9, during cleaning, because the piston of reciprocating piston pump 3 keeps motionless under motor 2 controls, therefore cleaning fluid can not escape in the working chamber of reciprocating pump 3, as shown in Figure 1.
Fig. 2~3 are a kind of preferred arrangements structure chart of cleaning device of the present invention, when inhaling sample and application of sample, the operating position at three-way diverter valve place only is connected the working chamber of reciprocating piston pump 3 with capillary 1, when the piston of reciprocating pump 3 spurred, sample just sucked in the capillary 1.Then capillary 1 is moved on to application of sample mouth 10, promote the piston of reciprocating pump 3, sample promptly is pushed out and is added in the application of sample mouth 10 from capillary 1.Owing in the capillary 1 last time sample may residually be arranged, so before inhaling sample next time, must clean capillary 1: capillary 1 is moved on to service sink, as shown in Figure 2, three-way diverter valve 14 is driven by the motor 2 of control system 7 controls, the working chamber of reciprocating piston pump 3 is connected with cleaning fluid cup 13, utilizes reciprocating piston pump 3 cleaning fluid in the uncovered cleaning fluid cup 13 to be sucked the working chamber of reciprocating piston pump 3; By motor 2 controls reciprocating pump 3 pistons and capillary 1 are connected three-way diverter valve 14 again, as shown in Figure 3, promote reciprocating pump 3 pistons, the cleaning fluid in the working chamber is pressurizeed, pressurized washing liquid is finished the cleaning of capillary 1 in capillary 1 ejection, inflow service sink 11.
Fig. 4 is a kind of preferred arrangements structure chart of cleaning device of the present invention, and for making full use of suction, the ejection that cleaning fluid self flows, is convenient to cleaning fluid, solenoid directional control valve is
Shape arranges that wherein, the valve port that three-way diverter valve 14 makes progress communicates with the bottom of cleaning fluid cup 13, and middle valve port communicates with reciprocating piston pump 3, and following valve port communicates with capillary 1.
Claims (10)
1. one kind is cleaned automatic sampler method capillaceous, and it is characterized in that: described method was divided into for two steps:
The first step utilizes negative pressure that the cleaning fluid under the normal pressure is pumped into from soda liquor container in the temporary container;
In second step, the cleaning fluid pressurization to storing in the temporary container utilizes pressure wash liquid to wash away capillary to be cleaned.
2. cleaning automatic sampler according to claim 1 method capillaceous is characterized in that: the cleaning pressure of described pressure wash liquid is 0.2Mpa.
3. cleaning automatic sampler according to claim 1 method capillaceous is characterized in that: described capillary pipe length to be cleaned is 500~800mm, and internal diameter is 0.5mm, and the cleaning fluid volume that is pumped in the temporary container is 0.3~0.8ml.
4. the device that can realize the described cleaning automatic sampler of claim 1 capillary method, it is characterized in that: described device comprises uncovered cleaning fluid cup (13), reciprocating piston pump (3) and three-way diverter valve (14), three-way diverter valve (14) is arranged on cleaning fluid cup (13), between reciprocating piston pump (3) and the capillary (1), its valve port respectively with the working chamber of reciprocating piston pump (3), cleaning fluid cup (13) is connected with capillary (1) ne-leakage, three-way diverter valve (14) has two operating positions, can select the working chamber of reciprocating piston pump (3) to be connected with cleaning fluid cup (13), perhaps the working chamber of reciprocating piston pump (3) is connected with capillary (1).
5. according to the described cleaning automatic sampler of claim 4 device capillaceous, it is characterized in that: described three-way diverter valve (14) is a solenoid directional control valve.
6. according to the described cleaning automatic sampler of claim 5 device capillaceous, it is characterized in that: described solenoid directional control valve is
Shape arranges that wherein, the valve port that solenoid directional control valve makes progress communicates with the bottom of cleaning fluid cup (13), and middle valve port communicates with reciprocating piston pump (3), and following valve port communicates with capillary (1).
7. according to the described cleaning automatic sampler of claim 5 device capillaceous, it is characterized in that: described solenoid directional control valve is
Shape arranges that wherein, the valve port that solenoid directional control valve makes progress communicates with reciprocating piston pump (3), and two following valve ports communicate with capillary (1) and cleaning fluid cup (13) respectively.
8. according to the described cleaning automatic sampler of claim 4 device capillaceous, it is characterized in that: described three-way diverter valve (14), reciprocating piston pump (3), capillary (1) drive by the motor (2) of control system (7) control.
9. according to the described cleaning automatic sampler of claim 4 device capillaceous, it is characterized in that: described three-way diverter valve (14), the work number of times of reciprocating piston pump (3) in each cleaning frequency are adjustable.
10. according to the described cleaning automatic sampler of claim 4 device capillaceous, it is characterized in that: described three-way diverter valve (14) is electro-hydraulic reversing valve or motor-driven reversal valve.
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CN200910198412XA CN102049397A (en) | 2009-11-06 | 2009-11-06 | Method and device for cleaning capillary of automatic sampler |
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CN200910198412XA CN102049397A (en) | 2009-11-06 | 2009-11-06 | Method and device for cleaning capillary of automatic sampler |
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102632057A (en) * | 2012-03-21 | 2012-08-15 | 北京博晖创新光电技术股份有限公司 | Cleaning device for capillary tube of automatic sampler and cleaning method |
CN105195474A (en) * | 2015-10-27 | 2015-12-30 | 郑州椿长仪器仪表有限公司 | Device and method for cleaning capillary tube of separate measurement type thermometer |
CN110921609A (en) * | 2019-11-29 | 2020-03-27 | 吴鹏 | Liquid dosing device system |
CN111991103A (en) * | 2020-09-10 | 2020-11-27 | 青岛市市立医院 | Scalpel belt cleaning device |
CN115090622A (en) * | 2022-06-17 | 2022-09-23 | 厦门瑞尔特卫浴科技股份有限公司 | Cleaning system and cleaning method for urine test closestool |
-
2009
- 2009-11-06 CN CN200910198412XA patent/CN102049397A/en active Pending
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102632057A (en) * | 2012-03-21 | 2012-08-15 | 北京博晖创新光电技术股份有限公司 | Cleaning device for capillary tube of automatic sampler and cleaning method |
CN102632057B (en) * | 2012-03-21 | 2015-02-04 | 北京博晖创新光电技术股份有限公司 | Cleaning device for capillary tube of automatic sampler and cleaning method |
CN105195474A (en) * | 2015-10-27 | 2015-12-30 | 郑州椿长仪器仪表有限公司 | Device and method for cleaning capillary tube of separate measurement type thermometer |
CN110921609A (en) * | 2019-11-29 | 2020-03-27 | 吴鹏 | Liquid dosing device system |
CN111991103A (en) * | 2020-09-10 | 2020-11-27 | 青岛市市立医院 | Scalpel belt cleaning device |
CN111991103B (en) * | 2020-09-10 | 2022-04-05 | 青岛市市立医院 | Scalpel belt cleaning device |
CN115090622A (en) * | 2022-06-17 | 2022-09-23 | 厦门瑞尔特卫浴科技股份有限公司 | Cleaning system and cleaning method for urine test closestool |
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Application publication date: 20110511 |