CN113640055A - Method and system for sampling and fixing volume - Google Patents
Method and system for sampling and fixing volume Download PDFInfo
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- CN113640055A CN113640055A CN202110649148.8A CN202110649148A CN113640055A CN 113640055 A CN113640055 A CN 113640055A CN 202110649148 A CN202110649148 A CN 202110649148A CN 113640055 A CN113640055 A CN 113640055A
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- sampling
- sample
- constant volume
- electromagnetic valve
- pipeline
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/10—Devices for withdrawing samples in the liquid or fluent state
- G01N1/14—Suction devices, e.g. pumps; Ejector devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N31/00—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods
- G01N31/16—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods using titration
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
Abstract
The invention belongs to the technical field of on-line chemical titration analysis sampling, and discloses a sampling constant volume system which comprises a sampling three-way electromagnetic valve, a pure water sampling tube, a sample liquid sampling tube, a constant volume pipeline, a sampling pump, a sampling three-way electromagnetic valve, a sampling liquid outlet tube and a waste discharge tube, wherein the constant volume pipeline is detachably provided with the constant volume tube, the input end of the constant volume pipeline is connected with the output end of the sampling three-way electromagnetic valve, the output end of the constant volume pipeline is connected with the input end of the sampling three-way electromagnetic valve, the input end of the sampling three-way electromagnetic valve is connected with the pure water sampling tube and the sample liquid sampling tube, and the output end of the sampling three-way electromagnetic valve is connected with the sampling liquid outlet tube and the waste discharge tube. By adopting the system, the sampling amount is controlled by controlling the length and the inner diameter specification of the constant volume pipeline, and the system is not related to the rotating speed precision of the pump; the sampling constant volume of this mode just can be changed to change the constant volume pipe to can satisfy the demand of different constant volumes.
Description
Technical Field
The invention belongs to the technical field of on-line chemical titration analysis sampling, and particularly relates to a sampling constant volume method and a system.
Background
In the current online titrator and other online chemical titration analysis equipment, the following is a common method for quantitative and constant volume sampling of a standard sample:
1. the injection pump is adopted for sampling quantitatively, and in the sampling process, the injection pump firstly extracts a standard sample and then controls the sampling amount by controlling the pushing amount of the push rod of the injection pump. The method is complicated to clean the residual standard sample in the injection pump after sampling each time; in addition, the injection pump needs to adopt a one-way valve to ensure that the functional one-way valve is easily polluted and damaged due to the structural relationship; the injection pump has the structural characteristics that the cost is high, and a control system is complex;
2. the pump is adopted for quantitative sampling, and the number of the rotation turns of the rotor of the pump is controlled in the sampling process to pump out a constant amount of standard samples. Although the method has a simple structure and is easy to control, the sampling quantification is inaccurate due to the mechanical error of the aging pump rotor of the pump pipe with the elastic characteristic of the pump pipe, and the pump has to be calibrated to compensate for the accuracy; in addition, the sampling quantity can be greatly changed when the pump pipe is replaced every time;
3. sampling by adopting an electromagnetic constant delivery pump, and quantitatively taking a standard sample by controlling the pulsation times of the constant delivery pump in the sampling process. The method has a simple structure and is easy to control, but the one-way valve is easy to pollute and damage, and the structural characteristics of the pump cause that the flow of the pump needs to be calibrated frequently to stabilize the sampling precision;
thus, application No. 201822138650.9 discloses an automatic titrator comprising a sampling peristaltic pump, wherein the sampling peristaltic pump is communicated to a pure water bin and a standard sample bin through a second electromagnetic valve; the other side of the sampling peristaltic pump is communicated with a constant volume pipe, wherein the constant volume pipe is communicated to the reaction vessel and the first electromagnetic valve through a second node; the first electromagnetic valve is communicated to a waste discharge peristaltic pump which is communicated to a waste water bin; which can solve the above-mentioned problems; however, in the actual application process, the second node is the design of the three-way valve, the installation position requirement is particularly high, and the line backflow can be caused if the position of the second node is slightly improper, so that the quantitative accuracy is influenced; in addition, in the process of line rinsing, the sampling peristaltic pump and the waste discharge peristaltic pump are required to be opened simultaneously, the rinsing process is troublesome, and if the models of the sampling peristaltic pump and the waste discharge peristaltic pump are different, the line damage caused by the problems of flow velocity and flow rate and the like of the line can be caused, so that a new sampling constant volume method and a new sampling constant volume system are required to be designed to solve the problem.
Disclosure of Invention
In view of the problems raised by the above background art, the present invention is directed to: aims to provide a method and a system for sampling and fixing volume.
In order to achieve the technical purpose, the technical scheme adopted by the invention is as follows:
the utility model provides a sample constant volume system, is including advancing appearance three way solenoid valve, pure water sampling tube, appearance liquid sampling tube, constant volume pipeline, sample pump, play appearance three way solenoid valve, sample drain pipe and the exhaust stack, constant volume pipeline demountable installation has the constant volume pipe, the input of constant volume pipeline is connected with the output of advancing appearance three way solenoid valve, the output and the input of a appearance three way solenoid valve of constant volume pipeline are connected, the input of advancing appearance three way solenoid valve is connected with pure water sampling tube and appearance liquid sampling tube respectively, the output of a appearance three way solenoid valve is connected with sample drain pipe and exhaust stack respectively.
As a preferable scheme of the invention, the sampling pump is arranged on the constant volume pipeline.
As a preferable scheme of the present invention, two sampling pumps are provided, and the two sampling pumps are respectively installed on the pure water sampling pipe and the sample liquid sampling pipe.
In a preferred embodiment of the present invention, the sampling pump is a peristaltic pump.
As a preferable scheme of the invention, the constant volume pipeline is composed of a transparent plastic hard pipe.
A method for sampling and fixing volume comprises introducing a sample liquid sampling tube into sample liquid, introducing a pure water sampling tube into a pure water barrel, introducing a waste discharge tube into a waste liquid barrel, introducing a sampling liquid outlet tube into a reaction vessel,
s1: switching a sample injection three-way electromagnetic valve to ensure that the pipeline of the constant volume pipeline and the pipeline of the sample liquid sampling pipe are smooth, and switching a sample outlet three-way electromagnetic valve to ensure that the pipeline of the sample outlet three-way electromagnetic valve and the pipeline of the waste discharge pipe are smooth;
s2: opening a sampling pump, and carrying out rinsing on a constant volume pipeline;
s3: after rinsing for a certain time, closing the sampling pump, switching the sample injection three-way electromagnetic valve to ensure that the constant volume pipeline and the pipeline of the pure water sampling pipe are smooth, and switching the sample outlet three-way electromagnetic valve to ensure that the pipeline of the sample outlet three-way electromagnetic valve and the pipeline of the sampling liquid outlet pipe are smooth;
s4: opening the sampling pump to enable the sample liquid in the constant volume pipeline to enter the reaction vessel through the sampling liquid outlet pipe and enter the reaction vessel along with a certain amount of pure water;
s5: and after sampling for a certain time, closing the sampling pump to finish constant volume sampling.
As a preferable mode of the present invention, the method further comprises the following steps,
s6: after the constant volume sampling is finished, the sampling liquid outlet pipe is connected into a waste liquid barrel, and a sampling pump is started to enable pure water to clean the sample injection three-way electromagnetic valve, the sampling pump, the constant volume pipeline, the sample outlet three-way electromagnetic valve and the sampling liquid outlet pipe;
s7: after cleaning for a certain time, replacing the sample outlet three-way electromagnetic valve to ensure that the sample outlet three-way electromagnetic valve and the waste discharge pipe are smooth in pipeline, and cleaning the sample outlet three-way electromagnetic valve and the waste discharge pipe by pure water; after the cleaning is carried out for a certain time, the sampling pump is closed, so that the cleaning is finished, and the next sampling is prevented from being polluted.
The invention has the beneficial effects that:
1. the invention reduces the design of the waste discharge peristaltic pump, and the situation that two pumps work simultaneously can not occur, thereby solving the problem of multiple power inputs from the source, and further reducing the damage caused by the difference of the power inputs;
2. the design that the second node is the three-way valve is changed into the sample outlet three-way electromagnetic valve, so that the flow direction of liquid can be controlled through the sample outlet three-way electromagnetic valve without being limited by the installation position, and the precision of constant volume can be improved;
3. the matching design of the sample outlet three-way electromagnetic valve and the sample inlet three-way electromagnetic valve can realize automatic constant volume through a programming control program.
Drawings
The invention is further illustrated by the non-limiting examples given in the accompanying drawings;
FIG. 1 is a schematic structural diagram of a first embodiment of a sampling volumetric system according to the present invention;
FIG. 2 is a schematic structural diagram of a first embodiment of a sampling volumetric system according to the present invention;
FIG. 3 is a schematic structural diagram of a second embodiment of a sampling volumetric system according to the present invention;
FIG. 4 is a schematic diagram of a prior art solution;
the main element symbols are as follows:
a sample injection three-way electromagnetic valve 1, a pure water sampling tube 2, a sample liquid sampling tube 3, a constant volume pipeline 4, a sampling pump 5, a sample outlet three-way electromagnetic valve 6, a sampling liquid outlet pipe 7, a reaction vessel 8, a waste discharge pipe 9, a constant volume pipe 10, a pure water barrel 21 and a waste liquid barrel 22.
Detailed Description
In order that those skilled in the art can better understand the present invention, the following technical solutions are further described with reference to the accompanying drawings and examples.
Example one
As shown in fig. 1 and fig. 2, a sampling constant volume system comprises a sample injection three-way electromagnetic valve 1, a pure water sampling tube 2, a sample liquid sampling tube 3, a constant volume pipeline 4, a sampling pump 5, a sample outlet three-way electromagnetic valve 6, a sampling drain tube 7 and a waste discharge tube 9, wherein the constant volume pipeline 4 is detachably provided with the constant volume tube 10, the input end of the constant volume pipeline 4 is connected with the output end of the sample injection three-way electromagnetic valve 1, the output end of the constant volume pipeline 4 is connected with the input end of the sample outlet three-way electromagnetic valve 6, the input end of the sample injection three-way electromagnetic valve 1 is respectively connected with the pure water sampling tube 2 and the sample liquid sampling tube 3, the output end of the sample outlet three-way electromagnetic valve 6 is respectively connected with the sampling drain tube 7 and the waste discharge tube 9, and the sampling pump 5 is arranged on the constant volume pipeline 4;
a method for sampling and fixing volume comprises introducing a sample liquid sampling tube 3 into a sample liquid, introducing a pure water sampling tube 2 into a pure water barrel 21, introducing a waste discharge tube 9 into a waste liquid barrel 22, introducing a sampling liquid outlet tube 7 into a reaction vessel 8,
s1: switching the sample injection three-way electromagnetic valve 1 to ensure that the pipeline of the constant volume pipeline 4 and the sample liquid sampling pipe 3 is smooth, and switching the sample outlet three-way electromagnetic valve 6 to ensure that the pipeline of the sample outlet three-way electromagnetic valve 6 and the waste discharge pipe 9 is smooth;
s2: opening the sampling pump 5, and carrying out rinsing on the constant volume pipeline 4;
s3: after rinsing for a certain time, closing the sampling pump 5, switching the sample injection three-way electromagnetic valve 1 to ensure that the constant volume pipeline 4 and the pipeline of the pure water sampling pipe 2 are smooth, and switching the sample outlet three-way electromagnetic valve 6 to ensure that the pipeline of the sample outlet three-way electromagnetic valve 6 and the pipeline of the sample outlet pipe 7 are smooth;
s4: opening the sampling pump 5 to enable the sample liquid in the constant volume pipeline 4 to enter the reaction vessel 9 through the sampling liquid outlet pipe 7 and enter the reaction vessel 9 along with a certain amount of pure water;
s5: after sampling for a certain time, the sampling pump 5 is closed to complete the constant volume sampling.
S6: after the constant volume sampling is finished, the sampling liquid outlet pipe 7 is connected into the waste liquid barrel 22, and the sampling pump 5 is started to clean the sample injection three-way electromagnetic valve 1, the sampling pump 5, the constant volume pipeline 4, the sample outlet three-way electromagnetic valve 6 and the sampling liquid outlet pipe 7 by pure water;
s7: after cleaning for a certain time, replacing the sample three-way electromagnetic valve 6, enabling the sample three-way electromagnetic valve 6 and the waste discharge pipe 9 to be smooth in pipeline, and enabling pure water to clean the sample three-way electromagnetic valve 6 and the waste discharge pipe 9; after cleaning for a certain time, the sampling pump 5 is turned off to complete the cleaning, preventing the next sampling from being contaminated.
In the embodiment, sampling is not related to the rotating speed precision of the pump, the sampling amount is controlled by controlling the inner diameter specification of the constant volume pipeline 4, and the control mode is simple; the connection mode dismantled of constant volume pipe for it is convenient to change the constant volume pipe, changes constant volume pipe 10 and just can change the sample constant volume of this mode, thereby can satisfy the demand of different constant volumes.
Example two
As shown in fig. 3, a sampling constant volume system comprises a sample injection three-way solenoid valve 1, a pure water sampling tube 2, a sample liquid sampling tube 3, a constant volume pipeline 4, a sampling pump 5, a sample outlet three-way solenoid valve 6, a sampling drain tube 7 and a waste discharge tube 9, wherein the constant volume pipeline 4 is detachably provided with the constant volume tube 10, the input end of the constant volume pipeline 4 is connected with the output end of the sample injection three-way solenoid valve 1, the output end of the constant volume pipeline 4 is connected with the input end of the sample outlet three-way solenoid valve 6, the input end of the sample injection three-way solenoid valve 1 is respectively connected with the pure water sampling tube 2 and the sample liquid sampling tube 3, the output end of the sample outlet three-way solenoid valve 6 is respectively connected with the sampling drain tube 7 and the waste discharge tube 9, the number of the sampling pumps 5 is two, and the two sampling pumps 5 are respectively arranged on the pure water sampling tube 2 and the sample liquid sampling tube 3;
a method for sampling and fixing volume comprises introducing a sample liquid sampling tube 3 into a sample liquid, introducing a pure water sampling tube 2 into a pure water barrel 21, introducing a waste discharge tube 9 into a waste liquid barrel 22, introducing a sampling liquid outlet tube 7 into a reaction vessel 8,
s1: switching the sample injection three-way electromagnetic valve 1 to ensure that the pipeline of the constant volume pipeline 4 and the sample liquid sampling pipe 3 is smooth, and switching the sample outlet three-way electromagnetic valve 6 to ensure that the pipeline of the sample outlet three-way electromagnetic valve 6 and the waste discharge pipe 9 is smooth;
s2: opening a sampling pump 5 on the sample liquid sampling tube 3, and carrying out rinsing on a constant volume pipeline 4;
s3: after a certain time of rinsing, closing the sampling pump 5 on the sample liquid sampling tube 3, switching the sample introduction three-way electromagnetic valve 1 to ensure that the constant volume pipeline 4 and the pure water sampling tube 2 are unobstructed, and switching the sample discharge three-way electromagnetic valve 6 to ensure that the sample discharge three-way electromagnetic valve 6 and the sampling liquid outlet tube 7 are unobstructed;
s4: opening a sampling pump 5 on the pure water sampling tube 2, so that the sample liquid in the constant volume pipeline 4 enters a reaction vessel 9 through a sampling liquid outlet pipe 7 and enters the reaction vessel 9 along with a certain amount of pure water;
s5: after sampling for a certain time, the sampling pump 5 on the pure water sampling tube 2 is closed to finish the constant volume sampling.
S6: after the constant volume sampling is finished, the sampling liquid outlet pipe 7 is connected to the waste liquid barrel 22, and the sampling pump 5 on the pure water sampling pipe 2 is opened, so that pure water cleans the sample injection three-way electromagnetic valve 1, the constant volume pipeline 4, the sample outlet three-way electromagnetic valve 6 and the sampling liquid outlet pipe 7;
s7: after cleaning for a certain time, replacing the sample three-way electromagnetic valve 6, enabling the sample three-way electromagnetic valve 6 and the waste discharge pipe 9 to be smooth in pipeline, and enabling pure water to clean the sample three-way electromagnetic valve 6 and the waste discharge pipe 9; after the cleaning for a certain time, the sampling pump 5 on the pure water sampling tube 2 is turned off to complete the cleaning and prevent the next sampling from being polluted.
Compared with embodiment 1, the embodiment uses 2 sampling pumps to respectively control the sample liquid and the pure water, the sampling constant volume is mainly determined by the length of the constant volume pipeline 4, and the problem of small sampling volume caused by abrasion of a pump pipe after the sampling pump works for a long time is solved; the stability of the sample liquid for sampling and constant volume is greatly improved.
The foregoing embodiments are merely illustrative of the principles of the present invention and its efficacy, and are not to be construed as limiting the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (7)
1. The utility model provides a sample constant volume system, includes appearance tee bend solenoid valve (1), pure water sampling tube (2), appearance liquid sampling tube (3), constant volume pipeline (4), sampling pump (5), play appearance tee bend solenoid valve (6), sample drain pipe (7) and exhaust pipe (9), its characterized in that: constant volume pipeline (4) demountable installation has constant volume pipe (10), the input of constant volume pipeline (4) is connected with the output of advancing appearance three way solenoid valve (1), the output of constant volume pipeline (4) is connected with the input that goes out appearance three way solenoid valve (6), the input that advances appearance three way solenoid valve (1) is connected respectively with pure water sampling tube (2) and appearance liquid sampling tube (3), the output that goes out appearance three way solenoid valve (6) is connected with sample drain pipe (7) and exhaust pipe (9) respectively.
2. A sample and volume metering system as claimed in claim 1, wherein: the sampling pump (5) is arranged on the constant volume pipeline (4).
3. A sample and volume metering system as claimed in claim 1, wherein: the sampling pump (5) is provided with two, two the sampling pump (5) is installed respectively on pure water sampling tube (2) and sample liquid sampling tube (3).
4. A sample and volume metering system as claimed in claim 1, wherein: the sampling pump (5) is a peristaltic pump.
5. A sample and volume metering system as claimed in claim 1, wherein: the constant volume pipeline (4) is composed of a transparent plastic hard tube.
6. A sampling and volume fixing method based on the sampling and volume fixing system as claimed in any one of claims 1 to 5, wherein a sample liquid sampling tube (3) is connected into a sample liquid, a pure water sampling tube (2) is connected into a pure water barrel (21), a waste discharge tube (9) is connected into a waste liquid barrel (22), and a sampling liquid outlet tube (7) is connected into a reaction vessel (8), the method is characterized in that: comprises the following steps of (a) carrying out,
s1: switching the sample introduction three-way electromagnetic valve (1) to ensure that the pipelines of the constant volume pipeline (4) and the sample liquid sampling pipe (3) are smooth, and switching the sample discharge three-way electromagnetic valve (6) to ensure that the pipelines of the sample discharge three-way electromagnetic valve (6) and the waste discharge pipe (9) are smooth;
s2: opening the sampling pump (5), and carrying out rinsing on the constant volume pipeline (4);
s3: after rinsing for a certain time, closing the sampling pump (5), switching the sample injection three-way electromagnetic valve (1) to ensure that the pipeline of the constant volume pipeline (4) and the pure water sampling pipe (2) is smooth, and switching the sample outlet three-way electromagnetic valve (6) to ensure that the pipeline of the sample outlet three-way electromagnetic valve (6) and the sampling liquid outlet pipe (7) is smooth;
s4: opening the sampling pump (5) to enable the sample liquid in the constant volume pipeline (4) to enter the reaction vessel (9) through the sampling liquid outlet pipe (7) and enter the reaction vessel (9) along with a certain amount of pure water;
s5: after sampling for a certain time, the sampling pump (5) is closed to finish the constant volume sampling.
7. A method of sampling and sizing as claimed in claim 6, wherein: the method also comprises the following steps of,
s6: after the constant volume sampling is finished, the sampling liquid outlet pipe (7) is connected into the waste liquid barrel (22), and the sampling pump (5) is opened to enable pure water to clean the sample injection three-way electromagnetic valve (1), the sampling pump (5), the constant volume pipeline (4), the sample outlet three-way electromagnetic valve (6) and the sampling liquid outlet pipe (7);
s7: after cleaning for a certain time, replacing the sample outlet three-way electromagnetic valve (6), enabling the sample outlet three-way electromagnetic valve (6) and the waste discharge pipe (9) to be smooth in pipeline, and enabling pure water to clean the sample outlet three-way electromagnetic valve (6) and the waste discharge pipe (9); after the cleaning is carried out for a certain time, the sampling pump (5) is closed, so that the cleaning is finished, and the next sampling is prevented from being polluted.
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| CN202110649148.8A CN113640055A (en) | 2021-06-10 | 2021-06-10 | Method and system for sampling and fixing volume |
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| CN202110649148.8A CN113640055A (en) | 2021-06-10 | 2021-06-10 | Method and system for sampling and fixing volume |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114166833A (en) * | 2021-11-24 | 2022-03-11 | 云南省农业科学院质量标准与检测技术研究所 | On-site rapid detection method and device for VC content of non-red vegetables |
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2021
- 2021-06-10 CN CN202110649148.8A patent/CN113640055A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114166833A (en) * | 2021-11-24 | 2022-03-11 | 云南省农业科学院质量标准与检测技术研究所 | On-site rapid detection method and device for VC content of non-red vegetables |
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