CN215965292U - Double-injection-pump sample injection cleaning device - Google Patents
Double-injection-pump sample injection cleaning device Download PDFInfo
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- CN215965292U CN215965292U CN202122127205.4U CN202122127205U CN215965292U CN 215965292 U CN215965292 U CN 215965292U CN 202122127205 U CN202122127205 U CN 202122127205U CN 215965292 U CN215965292 U CN 215965292U
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Abstract
The utility model discloses a double-injection pump sample injection cleaning device, which comprises: the sample pump is communicated with the first end of the tee joint through a pipeline; the sample injection needle is communicated with the second end of the tee joint through a pipeline; the inner cleaning device is communicated with the third end of the tee joint through a pipeline; interior belt cleaning device includes scavenging pump and washing bottle, the scavenging pump passes through the normal open end intercommunication of pipeline and two-position three-way valve, the third end intercommunication of pipeline and tee bend is passed through to a gating end of two-position three-way valve, and the play liquid end intercommunication of another gating end and feed liquor pipe, the feed liquor end of feed liquor pipe stretches into in the washing bottle, and the feed liquor end is close to the setting of washing bottle bottom, the washing liquid has been held in the washing bottle. The utility model adopts a serial flow path structure of the injection pump and the two-position three-way valve, does not need to inject gas into the cleaning bottle, realizes accurate quantification of the cleaning liquid, ensures the single-direction flow of the cleaning liquid, and avoids cross contamination.
Description
Technical Field
The utility model relates to the technical field of sample treatment equipment, in particular to a double-injection-pump sample cleaning device.
Background
Graphite furnace atomic absorption is widely applied to the fields of food, environment and the like due to the characteristics of high sensitivity, wide measurement range, low sample consumption and the like. The main factor influencing the measurement accuracy of the graphite furnace is the sample introduction accuracy, and the sample amount of the graphite furnace atom absorbing single measurement is generally dozens of microliters, so the accuracy of the sample introduction amount directly influences the measurement result, and the sample introduction amount is small, so the requirements on the aspects of sample introduction accuracy, pollution control and the like are higher. Except introducing the appearance with the high accuracy syringe pump in the design, in order to prevent the mutual contamination between the sample, the syringe need wash after advancing the appearance at every turn, not only need wash the appearance pipeline inner wall, also need wash the syringe outer wall in order to prevent that outer hanging liquid from causing the pollution.
In the design of the graphite furnace sample injector commonly used in the market at present, a single injection pump (sample pump) mode is adopted in some graphite furnace sample injectors, the cleaning solution is sucked and leaned against a cleaning bottle to be injected with argon or air, the cleaning solution is pressed into a cleaning pipeline by the internal pressure of the cleaning bottle, and then the cleaning solution finally flows through a sample injection pipeline to realize the cleaning purpose by switching of various valve bodies; the cleaning liquid is sucked by the injection pump in a mode of adopting two injection pumps, but a plurality of one-way valves are used in the design so as to achieve the purpose of cleaning, and the cleaning liquid has a complex structure and higher cost.
The above two methods also have the following disadvantages:
1. the amount and the flow rate of the cleaning liquid in an air pressure mode depend on the size of the air pressure in the cleaning bottle, a pressure stabilizing valve is required to be used in a gas pipeline, and the pressure in the cleaning bottle can change along with the height of the cleaning liquid level, so that the pressure fluctuation is caused, and the cleaning effect is influenced;
2. the cleaning bottle is filled with gas with certain pressure, so that a large amount of gas is dissolved in the cleaning liquid, the cleaning liquid in which the large amount of gas is dissolved can release dissolved gas components after entering the cleaning pipeline, the gas exists in the sample injection pipeline in a micro bubble form, and the bubbles can influence the sample injection accuracy due to compressibility of the gas;
3. the air pressure mode needs to strictly seal a specially-made cleaning bottle and an inflation pipeline, and if the sealing is not good, local air leakage occurs, and no pressure exists in the cleaning bottle, the cleaning function cannot be realized; in addition, the requirement on cleaning the bottle is higher due to higher internal pressure, otherwise, the cleaning bottle is easy to deform;
4. in the conventional graphite furnace sample injector designed by two injection pumps, because a plurality of check valves are adopted, the check valves are easy to be adhered besides high price, and especially the check valves are easy to be out of order after long-term use.
Therefore, the person skilled in the art provides a cleaning device for sample injection with dual injection pumps to solve the problems mentioned in the background art.
SUMMERY OF THE UTILITY MODEL
The utility model provides a double-injection-pump sample injection cleaning device which does not use a one-way valve, adopts a serial flow path structure of an injection pump and a two-position three-way valve, does not need to inject gas into a cleaning bottle, realizes accurate quantification of cleaning liquid, ensures single-direction flow of the cleaning liquid, and avoids cross contamination.
In order to achieve the above purpose, the utility model provides the following technical scheme:
the utility model relates to a double-injection pump sample introduction cleaning device, which comprises:
the sample pump is communicated with the first end of the tee joint through a pipeline;
the sample injection needle is communicated with the second end of the tee joint through a pipeline;
the inner cleaning device is communicated with the third end of the tee joint through a pipeline;
interior belt cleaning device includes scavenging pump and washing bottle, the scavenging pump passes through the normal open end intercommunication of pipeline and two-position three-way valve, the third end intercommunication of pipeline and tee bend is passed through to a gating end of two-position three-way valve, and the play liquid end intercommunication of another gating end and feed liquor pipe, the feed liquor end of feed liquor pipe stretches into in the washing bottle, and the feed liquor end is close to the setting of washing bottle bottom, the washing liquid has been held in the washing bottle.
Further, the device also comprises an external cleaning device, wherein the external cleaning device is positioned at the downstream of the sample injection needle;
further, outer belt cleaning device is for wasing the case, the top of wasing the case has the opening, washs the incasement and holds the washing liquid.
Further, it is provided with the washing tank and arranges useless groove in the washing case, the washing tank is linked together with the top of arranging useless groove, the washing tank is located open-ended below, and holds the washing liquid in the washing tank.
Further, the bottom of the waste discharge groove is provided with a waste liquid nozzle, and the waste liquid nozzle is positioned at the outlet end of the cleaning box.
Preferably, the sample pump and the cleaning pump are both syringe pumps.
In the technical scheme, the double-injection-pump sample injection cleaning device provided by the utility model has the following beneficial effects:
1. by adopting the serial flow path structure of the sample pump, the cleaning pump and the two-position three-way valve, gas does not need to be injected into the cleaning bottle, and the problem that the gas dissolved in the cleaning liquid is released and diffused in the sample inlet pipe in an air pressure mode to influence the sample inlet accuracy is solved;
2. the structure of the device realizes unidirectional cleaning of the inner wall of the sample injection pipeline, and simultaneously, the outer wall of the sample injection needle is cleaned by adopting an outer cleaning device, so that the cleaning effect of the sample injection pipeline is improved;
3. the cleaning liquid used for cleaning the outer wall of the sample injection needle in the cleaning tank keeps dynamic updating, so that cross contamination is reduced to the maximum extent;
4. the injection pump is adopted to draw the cleaning liquid, so that the quantitative and cleaning consistency of the cleaning liquid is realized; the accurate quantification of the cleaning fluid is realized;
6. an expensive one-way valve is abandoned, and the valve has a simple structure and high reliability.
Drawings
In order to more clearly illustrate the embodiments of the present application or technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings can be obtained by those skilled in the art according to the drawings.
Fig. 1 is a schematic structural diagram of a double-syringe pump sample feeding and cleaning device provided in an embodiment of the present invention.
Description of reference numerals:
1. a sample pump; 2. a tee joint; 3. a sample injection needle; 4. cleaning the pump; 5. cleaning the bottle; 6. a two-position three-way valve; 7. a liquid inlet pipe; 8. a cleaning tank; 9. an opening; 10. a cleaning tank; 11. a waste discharge tank; 12. a waste liquid nozzle.
Detailed Description
In order to make the technical solutions of the present invention better understood, those skilled in the art will now describe the present invention in further detail with reference to the accompanying drawings.
As shown in fig. 1;
the embodiment of the utility model provides a double-injection pump sample introduction cleaning device, which comprises:
the sample pump 1 is communicated with the first end of the tee joint 2 through a pipeline;
the sample injection needle 3 is communicated with the second end of the tee joint 2 through a pipeline;
the inner cleaning device is communicated with the third end of the tee joint 2 through a pipeline;
interior belt cleaning device includes scavenging pump 4 and washing bottle 5, scavenging pump 4 passes through the normal open end intercommunication of pipeline and two-position three-way valve 6, the third end intercommunication of pipeline and tee bend 2 is held in a gating of two-position three-way valve 6, and another gating holds the play liquid end intercommunication with feed liquor pipe 7, the feed liquor end of feed liquor pipe 7 stretches into in washing bottle 5, and the feed liquor end is close to washing bottle 5 bottom and sets up, the washing liquid has been held in the washing bottle 5.
When cleaning, the cleaning pump 4 sucks cleaning liquid, a gating end of the two-position three-way valve 6, which is communicated with the liquid inlet pipe 7, is communicated with a normal end, the cleaning pump 4 works, the fixed steps of movement are carried out, a certain amount of cleaning liquid is sucked from the cleaning bottle 5 and enters the cleaning pump 4, then the two-position three-way valve 6 switches positions, the gating end communicated with the three-way pipe 2 is communicated with the normal end, the cleaning pump 4 works, the cleaning liquid is pushed to flow through the two-position three-way valve 6 and the three-way pipe 2 and is sprayed out from the sample injection needle 3, and therefore the inner wall of the whole sample injection pipeline is cleaned;
the device also comprises an external cleaning device which is positioned at the downstream of the sample injection needle 3; the outer cleaning device is a cleaning box 8, an opening 9 is formed in the top end of the cleaning box 8, and the bottom end of the cleaning box 8 is communicated with a waste liquid groove through a waste liquid nozzle 12. Wash incasement 8 and be provided with washing tank 10 and arrange useless groove 11, washing tank 10 is linked together with the top of arranging useless groove 11, washing tank 10 is located opening 9's below, and holds the washing liquid in washing tank 10. The outlet end of the waste discharge groove 11 is positioned in the waste liquid nozzle 12. The sample pump 1 and the cleaning pump 4 both adopt injection pumps.
Cleaning solution from injection needle 3 exhaust enters into washing tank 10, and washing tank 10 has fixed volume, is full of the cleaning solution of fixed volume back, and unnecessary cleaning solution overflow gets into flowing back groove 11, discharges from waste liquid mouth (exit end), and the cleaning solution that remains in washing tank 10 is used for wasing injection needle 3 outer wall, so comes and goes.
The specific working process is as follows:
1. when sample injection operation is executed, firstly, the resetting and cleaning functions of the sample injector are executed, the cleaning liquid is ensured to be filled in the whole pipeline, the influence on sample injection accuracy caused by bubbles in the pipeline is avoided, the gating end, communicated with the liquid inlet pipe 7, on the two-position three-way valve 6 is communicated with the normally open end, and the gating end communicated with the three-way valve is in a closed state;
2. before the sample is sucked, the sample pump 1 firstly sucks a fixed amount of air to isolate the measured sample from the cleaning liquid and prevent the sample from diffusing;
3. after drawing the air, the sampling needle 3 moves to the appointed position of the sample cup, the sample pump 1 moves downwards for a corresponding distance according to the set sampling amount, and the sample is drawn into a pipeline between the sampling needle 3 and the sample pump 1 through the sampling needle 3. The design of the pipeline between the sample injection needle 3 and the sample pump 1 ensures that the volume of the sucked fixed amount of air and the sample is sufficiently contained, so as to ensure that only the cleaning solution enters the sample pump 1;
4. after the sample is completely drawn, the sample injector automatically drops the sample into the graphite tube and then returns to the cleaning tank 10; the cleaning operation is executed, the two-position three-way valve 6 is still kept in a state that the gating end communicated with the liquid inlet pipe 7 at the upper part is communicated with the normally open end, the gating end communicated with the three-way valve is in a closed state, the cleaning pump 4 moves downwards for a fixed step number, and quantitative cleaning liquid is sucked into the cleaning pump 4;
5. the two-position three-way valve 6 is switched to a gating end communicated with the three-way valve 2 to be communicated with a normal end, the cleaning pump 4 moves upwards to push the cleaning liquid to flow through the two-position three-way valve 6 and the three-way valve 2 and spray out from the sample injection needle 3, and therefore the inner wall of the whole sample injection pipeline is cleaned; the sample injection pipeline comprises a sample injection needle 3, a pipeline for communicating the sample injection needle 3 with the tee joint 2, and a sample does not enter the sample pump 1 and does not need to be cleaned;
6. cleaning liquid discharged from the sample injection needle 3 enters a cleaning tank 10, the cleaning tank 10 has a fixed volume, and after a fixed amount of cleaning liquid is filled, the redundant cleaning liquid overflows into a liquid discharge tank 11 and is discharged to a waste liquid tank from the outlet end of the liquid discharge tank;
7. the cleaning liquid retained in the cleaning tank 10 is used for cleaning the outer wall of the injection needle 3, and thus goes back and forth.
In the technical scheme, the double-injection-pump sample injection cleaning device provided by the utility model has the following beneficial effects:
1. by adopting the serial flow path structure of the sample pump 1, the cleaning pump 4 and the two-position three-way valve 6, gas does not need to be injected into the cleaning bottle, and the problem that the gas dissolved in the cleaning liquid in the air pressure mode is released and diffused in the sample inlet pipe to influence the sample inlet accuracy is solved;
2. the structure of the device realizes unidirectional cleaning of the inner wall of the sample injection pipeline, and simultaneously, the outer wall of the sample injection needle is cleaned by adopting an outer cleaning device, so that the cleaning effect of the sample injection pipeline is improved;
3. the cleaning liquid used for cleaning the outer wall of the sample injection needle 3 in the cleaning tank 10 keeps dynamic updating, so that cross contamination is reduced to the maximum extent;
4. the injection pump is adopted to draw the cleaning liquid, so that the quantitative and cleaning consistency of the cleaning liquid is realized; the accurate quantification of the cleaning fluid is realized;
6. an expensive one-way valve is abandoned, and the valve has a simple structure and high reliability.
While certain exemplary embodiments of the present invention have been described above by way of illustration only, it will be apparent to those of ordinary skill in the art that the described embodiments may be modified in various different ways without departing from the spirit and scope of the utility model. Accordingly, the drawings and description are illustrative in nature and should not be construed as limiting the scope of the utility model.
Claims (6)
1. The utility model provides a two syringe pumps advance a kind belt cleaning device which characterized in that, the device includes:
the sample pump (1) is communicated with the first end of the tee joint (2) through a pipeline;
the sample injection needle (3) is communicated with the second end of the tee joint (2) through a pipeline;
the inner cleaning device is communicated with the third end of the tee joint (2) through a pipeline;
interior belt cleaning device includes scavenging pump (4) and washs bottle (5), scavenging pump (4) are through the normal open end intercommunication of pipeline and two-position three-way valve (6), the third end intercommunication of pipeline and tee bend (2) is passed through to a gating end of two-position three-way valve (6), and another gating end communicates with the play liquid end of feed liquor pipe (7), the feed liquor end of feed liquor pipe (7) stretches into in wasing bottle (5), and the feed liquor end is close to and washs bottle (5) bottom and sets up, the washing liquid has been placed in wasing bottle (5).
2. The cleaning device for double syringe pump sample introduction according to claim 1, further comprising an external cleaning device located downstream of the sample introduction needle (3).
3. The cleaning device for the double-injection pump sample injection according to claim 2, wherein the external cleaning device is a cleaning tank (8), the top end of the cleaning tank (8) is provided with an opening (9), cleaning liquid is contained in the cleaning tank (8), and the bottom end of the cleaning tank (8) is communicated with the waste liquid tank through a waste liquid nozzle (12).
4. The cleaning device with double injection pumps for sample injection according to claim 3, characterized in that a cleaning tank (10) and a waste discharge tank (11) are arranged in the cleaning box (8), the top of the cleaning tank (10) is communicated with the top of the waste discharge tank (11), the cleaning tank (10) is located below the opening (9) and the cleaning tank (10) holds cleaning solution.
5. The cleaning device for the double-injection pump sample injection according to claim 4, wherein the outlet end of the waste discharge groove (11) is positioned in the waste liquid nozzle (12).
6. The cleaning device for sample injection with double injection pumps as claimed in claim 5, wherein the injection pump is used for both the sample pump (1) and the cleaning pump (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122127205.4U CN215965292U (en) | 2021-09-03 | 2021-09-03 | Double-injection-pump sample injection cleaning device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122127205.4U CN215965292U (en) | 2021-09-03 | 2021-09-03 | Double-injection-pump sample injection cleaning device |
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| CN215965292U true CN215965292U (en) | 2022-03-08 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114994223A (en) * | 2022-04-29 | 2022-09-02 | 天津博纳艾杰尔科技有限公司 | Automatic sample injection liquid path system and automatic sample injection method |
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- 2021-09-03 CN CN202122127205.4U patent/CN215965292U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114994223A (en) * | 2022-04-29 | 2022-09-02 | 天津博纳艾杰尔科技有限公司 | Automatic sample injection liquid path system and automatic sample injection method |
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