A liquid sample pre-treatment system

Abstract

The utility model relates to online analysis system gas sample processing technical field discloses a liquid sample pretreatment system, including instrument air pipe line, a branch is to the inside of box purging to keep clean, another branch enters the gas inlet of diaphragm pump, nitrogen gas pipeline, sets up third ball valve and check valve on main pipeline, and the one end of main pipeline divides three branches, wherein two branches transport nitrogen gas as driving gas, and the third branch divides into two paths and enters the normally closed end of corresponding first three -way pneumatic valve and second three -way pneumatic valve respectively, sample pipeline, through fourth ball valve into the public end of first three -way pneumatic valve, from the normally open end, through diaphragm pump into the normally open end of second three -way pneumatic valve, finally from the public end of second three -way pneumatic valve into analysis system, the utility model is suitable for most open high pollutant liquid sample sampling, avoids sample analysis result distortion, reduces the design and manufacturing cost of sampling and pretreatment system, and reduces maintenance difficulty.

Description

Technical Field

[0001] This utility model relates to the field of gas sample processing technology for online analysis systems, and more specifically, to a liquid sample pretreatment system. Background Technology

[0002] In online analysis systems, sampling from pools and deep pits is quite common. To ensure the accuracy and precision of sampling and to prevent the accumulation of contaminants inside the sampling pipeline, regular backflushing is necessary. Utility Model Content

[0003] The purpose of this invention is to provide a liquid sample pretreatment system that is suitable for most open-air sampling of highly polluting liquid samples, avoids distortion of sample analysis results, reduces the design and manufacturing costs of the sampling and pretreatment system, and reduces maintenance difficulty.

[0004] To solve the above-mentioned technical problems, the technical solution of this utility model is: a liquid sample pretreatment system, comprising,

[0005] The instrument air duct has one branch that purges the interior of the housing through a first ball valve and a first filter pressure reducing valve to keep it clean; the other branch, after passing through a second ball valve and a second filter pressure reducing valve, is controlled by a first two-way pneumatic valve to enter the diaphragm pump inlet.

[0006] The nitrogen pipeline has a third ball valve and a check valve on the main line, and three branches branch off from one end of the main line; two of the branches supply nitrogen as the driving gas, and the third branch is controlled by the second two-way pneumatic valve to split into two paths, which enter the normally closed ends of the corresponding first three-way pneumatic valve and second three-way pneumatic valve respectively.

[0007] The sample line enters the common terminal of the first three-way pneumatic valve through the fourth ball valve, exits from the normally open terminal, passes through the diaphragm pump into the normally open terminal of the second three-way pneumatic valve, and finally enters the analysis system from the common terminal of the second three-way pneumatic valve.

[0008] According to this utility model, the second ball valve and the second filter pressure reducing valve are controlled by the first two-way pneumatic valve to enter the diaphragm pump inlet through the second needle valve.

[0009] According to this utility model, further, a first solenoid valve and a second solenoid valve are respectively installed on the two branches for conveying nitrogen gas. Nitrogen gas enters the first solenoid valve and the second solenoid valve as driving gas. The first solenoid valve controls the opening of the first two-way pneumatic valve through the three-way driving gas, and switches the flow paths of the first three-way pneumatic valve and the second three-way pneumatic valve to the normally open position. The second solenoid valve controls the opening of the second two-way pneumatic valve independently. At this time, the diaphragm pump operates normally and extracts the sample into the analysis system through negative pressure. When backflushing is required for sampling, the first two-way pneumatic valve is closed, the second two-way pneumatic valve is opened, the flow paths of the first three-way pneumatic valve and the second three-way pneumatic valve are switched to the normally closed position, the diaphragm pump stops, and nitrogen gas discharges the waste liquid in the sample pipeline into the water tank and the waste liquid main of the analysis system, respectively.

[0010] According to this utility model, the third branch of the nitrogen pipeline is divided into two paths by the second two-way pneumatic valve, which respectively pass through the first needle valve and the third needle valve to the normally closed ends of the corresponding first three-way pneumatic valve and the second three-way pneumatic valve.

[0011] According to this utility model, it further includes a cleaning branch that extends to the waste liquid recycling point to clean up the waste liquid and discharge impurities.

[0012] According to this utility model, the cleaning branch is further comprising two branches, each equipped with a fifth ball valve and a sixth ball valve. Opening the fifth and sixth ball valves allows for the cleaning of waste liquid and the discharge of impurities; closing the second, third, and fourth ball valves, and opening the fifth and sixth ball valves, allows for the discharge of cleaning waste liquid and impurities.

[0013] Compared with the prior art, the advantages of this utility model are: this utility model is suitable for most open-air sampling of highly polluting liquid samples, avoids distortion of sample analysis results, reduces the design and manufacturing costs of sampling and pretreatment systems, and reduces maintenance difficulty. Attached Figure Description

[0014] Figure 1 A diagram of the liquid sample pretreatment system provided by this utility model.

[0015] In the diagram: First ball valve 1, First filter pressure reducing valve 2, Second ball valve 3, Second filter pressure reducing valve 4, Third ball valve 5, Check valve 6, First solenoid valve 7, Second solenoid valve 8, First two-way pneumatic valve 9, Second two-way pneumatic valve 10, First needle valve 11, Second needle valve 12, Third needle valve 13, Fourth ball valve 14, First three-way pneumatic valve 15, Fifth ball valve 16, Diaphragm pump 17, Sixth ball valve 18, Second three-way pneumatic valve 19. Detailed Implementation

[0016] The following will refer to the appendix in the embodiments of this utility model. Figure 1The technical solutions in the embodiments of this utility model are clearly and completely described herein. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0017] Combination Figure 1 This utility model provides a liquid sample pretreatment system, comprising: a first ball valve 1, a first filter pressure reducing valve 2, a second ball valve 3, a second filter pressure reducing valve 4, a third ball valve 5, a one-way valve 6, a first solenoid valve 7, a second solenoid valve 8, a first two-way pneumatic valve 9, a second two-way pneumatic valve 10, a first needle valve 11, a second needle valve 12, a third needle valve 13, a fourth ball valve 14, a first three-way pneumatic valve 15, a fifth ball valve 16, a diaphragm pump 17, a sixth ball valve 18, and a second three-way pneumatic valve 19. Solid lines represent main pipelines. Dashed lines represent the system logic control section, and special line types with diagonal lines represent pneumatic signals.

[0018] One branch of the independent instrument air duct purges the inside of the housing through the first ball valve 1 and the first filter pressure reducing valve 2 to keep it clean, while the other branch passes through the second ball valve 3 and the second filter pressure reducing valve 4, and then is controlled by the first two-way pneumatic valve 9 to enter the air inlet of the diaphragm pump 17 through the second needle valve 12.

[0019] The independent nitrogen pipeline branches into three branches through the third ball valve 5 and the one-way valve 6. The first two branches enter the first solenoid valve 7 and the second solenoid valve 8 as driving gas, respectively. The third branch is controlled by the second two-way pneumatic valve 10 to split into two paths, which pass through the first needle valve 11 and the third needle valve 13 to enter the normally closed ends of the corresponding first three-way pneumatic valve 15 and the second three-way pneumatic valve 19.

[0020] An independent sample line enters the common end of the first three-way pneumatic valve 15 through the fourth ball valve 14, exits from the normally open end, passes through the diaphragm pump 17, enters the normally open end of the second three-way pneumatic valve 19, and finally enters the analysis system from the common end of the second three-way pneumatic valve 19.

[0021] Two cleaning branches are installed on the sample pipeline, both of which extend to the waste liquid recovery point. A fifth ball valve 16 and a sixth ball valve 18 are respectively installed on the two cleaning branches. Opening the fifth ball valve 16 and the sixth ball valve 18 will clean the waste liquid and discharge impurities.

[0022] The working principle of this utility model is as follows:

[0023] During sampling, the first solenoid valve 7 simultaneously controls the opening of the first two-way pneumatic valve 9 through three driving gas paths, and the flow paths of the first three-way pneumatic valve 15 and the second three-way pneumatic valve 19 are switched to the normally open position. The second solenoid valve 8 independently controls the two-way pneumatic valve 10 to close. At this time, the diaphragm pump 17 operates normally, and the sample is extracted into the analysis system through negative pressure. When backflushing is required, the first two-way pneumatic valve 9 is closed, the second two-way pneumatic valve 10 is opened, and the flow paths of the first three-way pneumatic valve 15 and the second three-way pneumatic valve 19 are switched to the normally closed position. At this time, the diaphragm pump 17 stops, and nitrogen gas discharges the waste liquid in the sample pipeline into the water tank and the waste liquid main of the analysis system, respectively.

[0024] When maintenance is required, the second ball valve 3, the third ball valve 5 and the fourth ball valve 14 can be closed, and the fifth ball valve 16 and the sixth ball valve 18 can be opened to drain the cleaning waste liquid and impurities.

[0025] This utility model relates to a pretreatment system for highly polluting liquid samples. It can be remotely controlled via DCS logic signals to switch between sampling and backflushing functions. The system is stable, low in cost, and easy to maintain.

[0026] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A liquid sample pretreatment system, characterized in that, include, The instrument air duct has one branch that purges the interior of the housing through a first ball valve and a first filter pressure reducing valve to keep it clean; the other branch, after passing through a second ball valve and a second filter pressure reducing valve, is controlled by a first two-way pneumatic valve to enter the diaphragm pump inlet. The nitrogen pipeline has a third ball valve and a check valve on the main line, and three branches branch off from one end of the main line. in Two branches supply nitrogen as driving gas, and the third branch is divided into two paths by the second two-way pneumatic valve, which respectively enter the normally closed ends of the corresponding first three-way pneumatic valve and second three-way pneumatic valve. The sample line enters the common terminal of the first three-way pneumatic valve through the fourth ball valve, exits from the normally open terminal, passes through the diaphragm pump into the normally open terminal of the second three-way pneumatic valve, and finally enters the analysis system from the common terminal of the second three-way pneumatic valve.

2. The liquid sample pretreatment system as described in claim 1, characterized in that, After the second ball valve and the second filter pressure reducing valve, the air enters the diaphragm pump inlet through the second needle valve controlled by the first two-way pneumatic valve.

3. The liquid sample pretreatment system as described in claim 2, characterized in that, The two branches supplying nitrogen are equipped with a first solenoid valve and a second solenoid valve, respectively. Nitrogen enters the first and second solenoid valves as driving gas. The first solenoid valve controls the opening of the first two-way pneumatic valve through three driving gas paths, and switches the flow paths of the first three-way pneumatic valve and the second three-way pneumatic valve to the normally open position. The second solenoid valve independently controls the opening of the second two-way pneumatic valve. At this time, the diaphragm pump operates normally, extracting the sample into the analysis system through negative pressure. If backflushing is required for sampling, the first two-way pneumatic valve closes, the second two-way pneumatic valve opens, and the flow paths of the first three-way pneumatic valve and the second three-way pneumatic valve switch to the normally closed position. The diaphragm pump stops, and nitrogen discharges the waste liquid in the sample pipeline into the water tank and the waste liquid main of the analysis system, respectively.

4. The liquid sample pretreatment system as described in claim 1, characterized in that, The third branch of the nitrogen pipeline is controlled by the second two-way pneumatic valve to split into two paths, which pass through the first needle valve and the third needle valve respectively and enter the normally closed ends of the corresponding first three-way pneumatic valve and second three-way pneumatic valve.

5. The liquid sample pretreatment system as described in claim 1, characterized in that, It also includes a cleaning branch that extends to the waste liquid recycling point to clean up waste liquid and discharge impurities.

6. The liquid sample pretreatment system as described in claim 5, characterized in that, The cleaning branch consists of two branches, each equipped with a fifth ball valve and a sixth ball valve. Opening the fifth and sixth ball valves allows for the cleaning of waste liquid and the discharge of impurities. Closing the second, third, and fourth ball valves and opening the fifth and sixth ball valves allows for the discharge of cleaning waste liquid and impurities.

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