Quantitative liquid sampling device with H-shaped structure

Abstract

The invention discloses a liquid quantitative sampling device with an H-shaped structure, which comprises an air pump and a quantitative pipeline, the output end of the air pump is connected with a fifth one-way valve, the two ends of the quantitative pipeline are respectively connected with a second three-way connecting pipe and a third three-way connecting pipe, and the output end of the second three-way connecting pipe is respectively connected with a third one-way valve and a fifth one-way valve. The output end of the third three-way connecting pipe is respectively connected with a fourth one-way valve and a sixth one-way valve, the output end of the fourth one-way valve is connected with a liquid flowmeter, the output end of the liquid flowmeter is connected with a waste liquid tank, and the output end of the sixth one-way valve is connected with the input end of a sampling tank. Aiming at the defects in the prior art, the pneumatic driving device is arranged on the sampling device, so that the sampling accuracy of the sampling device can be improved during liquid sampling, and the sampling device has the advantages of convenience in use, high stability and the like, and solves the problems that an existing manual quantitative sampling device is poor in quantitative accuracy, low in working efficiency, inconvenient to use and inconvenient to use. And the detection effect is influenced.

Description

Technical Field

[0001] The invention belongs to a sampling device, in particular to a liquid quantitative sampling device with an H-shaped structure. Background Art

[0002] The liquid quantitative sampling device is a device used to accurately obtain a specified volume of liquid sample and is widely used in chemical analysis, biological testing, pharmaceutical research and development and other fields.

[0003] Most of the existing quantitative sampling devices currently require manual quantitative sampling of samples to be tested, which have poor quantitative accuracy, low work efficiency, or relatively simple functions and cannot be replaced, making them inconvenient to use. In addition, although some automatic sampling devices are more convenient, they have complex structures, which easily lead to waste of resources and affect the detection effect. Summary of the invention

[0004] Purpose of the invention: In order to overcome the deficiencies in the prior art, the purpose of the present invention is to provide a liquid quantitative sampling device with an H-shaped structure and high accuracy and stability.

[0005] Technical solution: The present invention describes a liquid quantitative sampling device with an H-type structure, comprising an air pump and a quantitative pipeline, the output end of the air pump is connected to a fifth one-way valve, both ends of the quantitative pipeline are respectively connected to a second three-way connecting pipe and a third three-way connecting pipe, the output end of the second three-way connecting pipe is respectively connected to the third one-way valve and the fifth one-way valve, the output end of the third three-way connecting pipe is respectively connected to the fourth one-way valve and the sixth one-way valve, the output end of the fourth one-way valve is connected to a liquid flow meter, the output end of the liquid flow meter is connected to a waste liquid tank, and the output end of the sixth one-way valve is connected to the input end of the sampling tank.

[0006] Furthermore, the quantitative pipe is a hose with a length of 10 to 12 cm, an inner diameter of 1 to 2 mm, and an outer diameter of 2 to 3 mm.

[0007] Furthermore, the third one-way valve, the fourth one-way valve, the fifth one-way valve and the sixth one-way valve are CEME DG12V solenoid valves, whose inner diameter is 2-3 mm and outer diameter is 4-5 mm.

[0008] Further, the output end of the air pump is connected to a first three-way connecting pipe, the output ends of the first three-way connecting pipe are respectively connected to a first one-way valve and a fifth one-way valve, the output end of the first one-way valve is connected to a liquid storage tank, the output end of the liquid storage tank is connected to an input end of the second one-way valve, the output end of the waste liquid tank is connected to a seventh one-way valve, and the output end of the seventh one-way valve is connected to a liquid storage tank.

[0009] Furthermore, the top of the liquid storage tank is lower than the bottom of the waste liquid tank.

[0010] Furthermore, the first one-way valve and the seventh one-way valve are CEME DG12V solenoid valves, with an inner diameter of 2-3 mm and an outer diameter of 4-5 mm.

[0011] Furthermore, the air pump is a 370 diaphragm pump.

[0012] The working principle of the online water pipe automatic sampling structure: open the fifth one-way valve, the liquid enters the quantitative pipeline through the third one-way valve, and when the liquid flow meter detects that the sample fills the quantitative pipeline, it is output to the waste liquid tank through the fourth one-way valve on the left. When the quantitative pipeline is completely filled with the sample, close the second one-way valve, the third one-way valve, and the fourth one-way valve, open the single-way valve, the fifth one-way valve, and the sixth one-way valve, output the sample in the quantitative pipeline to the sampling tank, and complete the quantitative sampling of the liquid sample.

[0013] Working principle of the centrifuge tube pneumatic injection structure: the sample will pass through the first three-way connecting pipe and the first one-way valve under the pressure generated by the gas pumped out by the air pump, and then enter the quantitative pipeline through the second one-way valve and the third one-way valve from the liquid storage tank. When the liquid flow meter detects that the quantitative pipeline is full, the first one-way valve, the second one-way valve, the third one-way valve, and the fourth one-way valve are closed, and the fifth one-way valve and the sixth one-way valve are opened to output the sample in the quantitative pipeline to the sampling tank. If the liquid in the waste liquid tank can still be used, open the seventh one-way valve and output it to the waste liquid tank from the fourth one-way valve on the left. Make the excess liquid flow back from the waste liquid tank to the liquid storage tank to complete the quantitative sampling of the liquid sample.

[0014] Beneficial effects: Compared with the prior art, the present invention has the following significant features:

[0015] 1. By using a one-way valve, an air pump and a quantitative tube, accurate liquid quantitative sampling is achieved, the detection efficiency is improved, the structure is simple and the cost is low.

[0016] 2. Quantitative sampling is achieved through pneumatic transmission structure, which reduces manual operation, has pollution-free liquid transmission, good environmental adaptability, rapid action and quick response, simple and safe structure, and is easy to standardize, serialize and generalize.

[0017] 3. By adjusting the length and diameter of the quantitative tube, the volume of the quantitative tube can be changed to meet the specific quantitative requirements of quantitative sampling.

[0018] 4. Compared with two-way or multi-way valves, single-way valves are smaller in size and reduce errors caused by liquid accumulation.

[0019] 5. Add reflux structure design to improve reagent utilization efficiency and reduce waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a connection schematic diagram of the quantitative pipeline 11 of the present invention;

[0021] Figure 2 is a schematic structural diagram of Embodiment 1 of the present invention;

[0022] Figure 3 It is a structural diagram of embodiment 2 of the present invention.

[0023] Among them, 1. air pump; 2. first three-way connecting pipe; 3. first single-way valve; 4. liquid storage tank; 5. second single-way valve; 6. third single-way valve; 7. fourth single-way valve; 8. liquid flow meter; 9. waste liquid tank; 10. fifth single-way valve; 11. quantitative pipeline; 12. sixth single-way valve; 13. sampling tank; 14. seventh single-way valve; 15. second three-way connecting pipe; 16. third three-way connecting pipe. DETAILED DESCRIPTION

[0024] Example 1

[0025] like Figures 1-2 , a liquid quantitative sampling device for online water pipe automatic sampling, comprising an air pump 1 and a quantitative pipeline 11. The output end of the air pump 1 is fixedly connected to a fifth one-way valve 10 through a pipeline, and the two ends of the quantitative pipeline 11 are fixedly connected to a second three-way connecting pipe 15 and a third three-way connecting pipe 16. The output ends of the second three-way connecting pipe 15 are respectively k-end and g-end, the output end of the fifth one-way valve 10 is connected to the k-end, and the output end of the third one-way valve 6 is connected to the g-end. The output ends of the third three-way connecting pipe 16 are respectively l-end and h-end, the input end of the sixth one-way valve 12 is connected to the l-end, and the input end of the fourth one-way valve 7 is connected to the h-end. The output end of the fourth one-way valve 7 is connected to a liquid flow meter 8, the output end of the liquid flow meter 8 is connected to the input end of a waste liquid tank 9, and the output end of the sixth one-way valve 12 is connected to the input end of a sampling tank 13. The output end of the second one-way valve 5 is connected to the input end of the third one-way valve 6, and the output end of the sixth one-way valve 12 is connected to the input end of the sampling tank 13. The waste liquid tank 9 and the sampling tank 13 are both of closed design.

[0026] The quantitative pipeline 11 is made of a hose with a length of 15 cm, an inner diameter of 2 mm, and an outer diameter of 3 mm. The third one-way valve 6, the fourth one-way valve 7, the fifth one-way valve 10, and the sixth one-way valve 12 are CEME DG12V solenoid valves, and the body is made of a hard material of porcelain and rubber, with an inner diameter of 2.5 mm and an outer diameter of 4.6 mm. The air pump is a 370 diaphragm pump, and the equipment condition of the pumping speed is 3L / min. The above quantitative sampling operation process was repeatedly tested. The target sampling volume is 471μL. The results are listed in Table 1. The measurement results are distributed in the range of 460-490μL, with an average value of 477μL. The maximum sampling error is about 2.5%. The overall result is larger than the actual volume of the quantitative tube because there is still a certain volume in the one-way valve itself. The one-way valve with a smaller model and inner volume can be selected for improvement. The length and diameter of the quantitative pipeline 11 can be changed according to the specific sample sampling requirements.

[0027] Table 1 Repeated test results

[0028] Number of measurements Measurement value (μL) 1 489 2 487 3 475 4 465 5 476 6 470

[0029] In the online water pipe automatic sampling structure, the sample can be added manually or injected into the input end of the third one-way valve 6 by the front link structure. At this time, the second one-way valve 5, the third one-way valve 6, the fifth one-way valve 10 and the quantitative pipeline 11 are in a closed state, and the fourth one-way valve 7 is in an open state. By controlling the second one-way valve 5 and the third one-way valve 6 to open, the sample flows into the inner cavity of the quantitative pipeline 11 through the second one-way valve 5 and the third one-way valve 6. When the liquid flow meter 8 detects the sample, the air in the inner cavity of the quantitative pipeline 11 and the excess sample are transported to the inner cavity of the waste liquid tank 9 through the fourth one-way valve 7. When the quantitative pipeline 11 is completely filled with the sample, the second one-way valve 5, the third one-way valve 6 and the fourth one-way valve 7 are closed, and the fifth one-way valve 10 and the sixth one-way valve 12 are opened. The air is pumped by the air pump 1, and the air is delivered to the inner cavity of the quantitative pipeline 11 through the fifth one-way valve 10, so that the air pushes the sample to flow, and the sample in the inner cavity of the quantitative pipeline 11 is delivered to the inner cavity of the sampling tank 13 through the sixth one-way valve 12, thereby completing the quantitative sampling of the liquid sample.

[0030] Example 2

[0031] like Figure 3, the rest of the structure of this embodiment is the same as that of embodiment 1, except that: a first three-way connecting pipe 2, a first one-way valve 3, and a seventh one-way valve 14 are added. The output end of the air pump 1 is connected to the first three-way connecting pipe 2, and the output ends of the first three-way connecting pipe 2 are respectively connected to the first one-way valve 3 and the fifth one-way valve 10, the output end of the first one-way valve 3 is connected to the input end of the liquid storage tank 4, and the output end of the liquid storage tank 4 is connected to the input end of the second one-way valve 5. The output end of the waste liquid tank 9 is connected to the input end of the seventh one-way valve 14, and the output end of the seventh one-way valve 14 is connected to the liquid storage tank 4. The input end of the second one-way valve 5 is arranged at the bottom of the inner cavity of the liquid storage tank 4, and the output end of the first one-way valve 3 is arranged at the upper part of the inner cavity of the liquid storage tank 4. The liquid storage tank 4 is of a closed design, and the filling method can be divided into manual filling and feeding pipe connection filling. The first one-way valve 3 and the seventh one-way valve 14 are also CEME DG12V solenoid valves, and the body is made of a hard material of porcelain and rubber, with an inner diameter of 2.5 mm and an outer diameter of 4.6 mm.

[0032] Pneumatic sampling of centrifuge tubes: The pressure generated by the gas pump 1 is controlled to enter the inner cavity of the liquid storage tank 4 through the three-way connecting pipe 2 and the first one-way valve 3, so that the sample in the inner cavity of the liquid storage tank 4 flows into the inner cavity of the quantitative pipeline 11 through the second one-way valve 5 and the third one-way valve 6 due to the increase in pressure. When the liquid flow meter 8 detects that the inner cavity of the quantitative pipeline 11 is full, the first one-way valve 3, the second one-way valve 5, the third one-way valve 6 and the fourth one-way valve 7 are closed, and the fifth one-way valve 10 and the sixth one-way valve 12 are opened, so that the gas enters the inner cavity of the quantitative pipeline 11 through the three-way connecting pipe 2 and the fifth one-way valve 10, and the sample in the inner cavity of the quantitative pipeline 11 is output to the inner cavity of the sampling tank 13 through the sixth one-way valve 12.

[0033] During the process of injecting the sample into the inner cavity of the quantitative pipeline 11, when the air in the inner cavity of the quantitative pipeline 11 is discharged from the fourth one-way valve 7 to the inner cavity of the waste liquid tank 9, part of the sample will flow into the inner cavity of the waste liquid tank 9 along with the air. If the sample in the inner cavity of the waste liquid tank 9 can still be used, the sixth one-way valve 12 is closed, and the fourth one-way valve 7 and the seventh one-way valve 14 are opened. The gas pumped out by the air pump 1 is transported to the inner cavity of the waste liquid tank 9 through the first three-way connecting pipe 2, the fifth one-way valve 10, the quantitative pipeline 11, and the fourth one-way valve 7. The pressure in the inner cavity of the waste liquid tank 9 is increased, so that the pressure causes the sample in the inner cavity of the waste liquid tank 9 to flow back from the seventh one-way valve 14 to the inner cavity of the liquid storage tank 4.

Claims

1. A liquid quantitative sampling device with an H-shaped structure, characterized in that: The invention comprises an air pump (1) and a quantitative pipeline (11), wherein the output end of the air pump (1) is connected to a fifth one-way valve (10), the two ends of the quantitative pipeline (11) are respectively connected to a second three-way connecting pipe (15) and a third three-way connecting pipe (16), the output end of the second three-way connecting pipe (15) is respectively connected to the third one-way valve (6) and the fifth one-way valve (10), the output end of the third three-way connecting pipe (16) is respectively connected to a fourth one-way valve (7) and a sixth one-way valve (12), the output end of the fourth one-way valve (7) is connected to a liquid flow meter (8), the output end of the liquid flow meter (8) is connected to a waste liquid tank (9), and the output end of the sixth one-way valve (12) is connected to the input end of a sampling tank (13).

2. The liquid quantitative sampling device with an H-shaped structure according to claim 1, characterized in that: The quantitative pipeline (11) is a hose.

3. The liquid quantitative sampling device with an H-shaped structure according to claim 1, characterized in that: The quantitative pipe (11) has a length of 10 to 12 cm, an inner diameter of 1 to 2 mm, and an outer diameter of 2 to 3 mm.

4. The liquid quantitative sampling device with an H-shaped structure according to claim 1, characterized in that: The third one-way valve (6), the fourth one-way valve (7), the fifth one-way valve (10) and the sixth one-way valve (12) are CEME DG12V solenoid valves, with an inner diameter of 2 to 3 mm and an outer diameter of 4 to 5 mm.

5. The liquid quantitative sampling device with an H-shaped structure according to claim 1, characterized in that: The output end of the air pump (1) is connected to a first three-way connecting pipe (2), the output end of the first three-way connecting pipe (2) is respectively connected to a first one-way valve (3) and a fifth one-way valve (10), and the output end of the first one-way valve (3) is connected to a liquid storage tank (4).

6. The liquid quantitative sampling device with an H-shaped structure according to claim 5, characterized in that: The output end of the liquid storage tank (4) is connected to the input end of the second one-way valve (5).

7. The liquid quantitative sampling device with an H-shaped structure according to claim 5, characterized in that: The output end of the waste liquid tank (9) is connected to the seventh one-way valve (14), and the output end of the seventh one-way valve (14) is connected to the liquid storage tank (4).

8. The liquid quantitative sampling device with an H-shaped structure according to claim 5, characterized in that: The top of the liquid storage tank (4) is lower than the bottom of the waste liquid tank (9).

9. The liquid quantitative sampling device with an H-shaped structure according to claim 5, characterized in that: The first one-way valve (3) and the seventh one-way valve (14) are CEME DG12V solenoid valves, with an inner diameter of 2 to 3 mm and an outer diameter of 4 to 5 mm.

10. The liquid quantitative sampling device with an H-shaped structure according to claim 1, characterized in that: The air pump (1) is a 370 diaphragm pump.

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