Sampling flow path

Abstract

The utility model discloses a sampling flow path, which belongs to the field of detection equipment and comprises a multi-way valve, a two-position three-way valve, an injection pump and a mixing pipe, the multi-way valve comprises a first public port and a control port; the two-position three-way valve comprises a normally open port, a normally closed port and a second public port; the injection pump comprises a circulation port; the circulation port is communicated with the second public port; the mixing pipe comprises a first liquid inlet port and a first liquid outlet port; the first liquid inlet port is communicated with the first public port, and the first liquid outlet port is communicated with the normally-open port. According to the sampling flow path disclosed by the utility model, the mixing pipe is communicated between the injection pump and the multi-way valve, so that a sample or a medicament flowing through the multi-way valve is prevented from entering the injection pump in a sampling process, and therefore, no sample or medicament is remained in the injection pump, and the service life of the injection pump is prolonged.

Description

Technical Field

[0001] The utility model relates to the field of detection equipment, in particular to a sampling flow path. Background Art

[0002] An online water quality analyzer is a common water quality testing device, such as a TethyUV online water quality COD detector. During the detection process, the water path in the circulation pool is irradiated by the ultraviolet light of the xenon lamp, and certain components of the ultraviolet light are absorbed by the circulation pool, thereby being detected and analyzed. In water quality detectors, a flow path system of a syringe pump + several multi-way valves is often used, such as a water quality total mercury detection device using an ultraviolet digestion cold atomic fluorescence method disclosed in Chinese patent announcement No. CN107817236B, which uses a flow path switching system of a syringe pump + eight-way valve + three-way valve.

[0003] However, the syringe pump system is prone to problems such as unclean cleaning, reagent and sample residue during use, which affects the accuracy of the measurement. In the prior art, the UV digestion cold atomic fluorescence method water quality total mercury detection device isolates the syringe pump from contacting various reagents through carrier liquid + argon gas, reduces the material requirements of the syringe pump, and avoids contamination of the syringe pump. However, this isolation method requires continuous ventilation and replacement of argon gas, and the operation process is cumbersome. Utility Model Content

[0004] The utility model provides a sampling flow path, aiming to solve the problems of unclean cleaning and residual medicine samples in the existing injection pump flow path mentioned in the background technology.

[0005] In order to achieve the above purpose, the utility model adopts the following scheme:

[0006] The utility model provides a sampling flow path, including a multi-way valve, a two-position three-way valve, an injection pump and a mixing tube; the multi-way valve includes a first common port and a control port; the two-position three-way valve includes a normally open port, a normally closed port and a second common port; the injection pump includes a flow port; the flow port is connected to the second common port; the mixing tube includes a first liquid inlet port and a first liquid outlet port; the first liquid inlet port is connected to the first common port, and the first liquid outlet port is connected to the normally open port.

[0007] Furthermore, the sampling flow path also includes an extension pipe; one end of the extension pipe is connected to the first liquid inlet port, and the other end of the extension pipe is connected to the first common port; the extension pipe located in the mixing tube part is wound around the mixing tube.

[0008] Furthermore, a water sample detector is provided on the extension pipe between the mixing tube and the multi-way valve.

[0009] Furthermore, the control ports of the multi-way valve include a first reagent port, a second reagent port, a standard solution port, a reactor inlet port, a sample port, and an online sample port.

[0010] Furthermore, the control port of the multi-way valve also includes a first air port.

[0011] Furthermore, the control port of the multi-way valve also includes a pure water port.

[0012] Furthermore, the sampling flow path also includes a digestion system, which is connected to the reactor inlet port; an LED lamp and a detector are respectively arranged on the opposite side of the digestion system.

[0013] Furthermore, the digestion system is provided with an air pipe.

[0014] Furthermore, the sampling flow path also includes a two-position two-way valve; the two-position two-way valve includes a second liquid inlet port, and the second liquid inlet port is connected to the first common port of the multi-way valve.

[0015] Furthermore, the two-position two-way valve also includes a second liquid outlet port, and the second liquid outlet port is connected to a waste liquid pipe outside the flow path.

[0016] Compared with the existing technology, the utility model has the following advantages:

[0017] 1. By connecting a mixing tube between the syringe pump and the multi-way valve, the sample or medicine flowing through the multi-way valve during the sampling process is prevented from entering the syringe pump, thereby ensuring that there is no sample or medicine residue in the syringe pump, thereby extending the service life of the syringe pump;

[0018] 2. When sampling and testing, samples and reagents only stay in the mixing tube, avoiding the residue of samples and reagents in the injection pump, improving the liquid collection accuracy of the flow path, and ensuring the accuracy of the measurement results. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0020] Figure 1 It is a schematic diagram of the overall structure of a sampling flow path provided by an embodiment of the utility model.

[0021] Figure 2 It is a schematic diagram of the combined structure of an injection tube, a mixing tube, a multi-way valve and a two-position three-way valve.

[0022] Figure 3 It is a schematic diagram of the combined structure of a multi-way valve and a two-position two-way valve.

[0023] Figure 4It is a schematic diagram of the combined structure of the multi-way valve and the digestion system.

[0024] Main component symbols:

[0025] 1. Injection pump; 11. Circulation port; 2. Mixing tube; 21. Extension pipe; 22. First liquid inlet port; 23. First liquid outlet port; 3. Multi-way valve; 31. First reagent port; 32. Second reagent port; 33. Standard liquid port; 34. First air port; 35. Reactor inlet port; 36. Sample port; 37. Online sample port; 38. Pure water port; 39. First common port; 4. Water sample detector; 5. Two-position three-way valve; 51. Normally open port; 52. Normally closed port; 53. Second common port; 6. Digestion system; 61. LED light; 62. Detector; 63. Air pipe; 7. Two-position two-way valve; 71. Second liquid inlet port; 72. Second liquid outlet port. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0027] Example

[0028] Refer to the attached drawings of the specification, such as Figure 1-Figure 4 As shown, a sampling flow path can be used in a water quality detection device. Specifically, the sampling flow path includes a syringe pump 1, a mixing tube 2, a multi-way valve 3 and a two-position three-way valve 5. In the prior art, since the syringe pump 1 is directly connected to the multi-way valve 3, the liquid in the multi-way valve 3 will flow into the syringe pump 1, thereby contaminating the syringe pump 1 and causing residual medicine or samples in the syringe pump 1, affecting the service life of the syringe pump 1 and causing deviations in the detection results. In the present application, a mixing tube 2 is provided between the syringe pump 1 and the multi-way valve 3, so that the liquid in the multi-way valve 3 flows through the mixing tube 2 for mixing, and does not enter the syringe pump 1.

[0029] Specifically, Figure 2 As shown, the multi-way valve 3 includes a first common port 39 and a control port. The control port includes a first reagent port 31, a second reagent port 32, a standard liquid port 33, a first air port 34, a reactor inlet port 35, a sample port 36, an online sample port 37, and a pure water port 38. Different types of reagents for mixing can enter the multi-way valve 3 through the first reagent port 31 and the second reagent port 32 respectively, and then flow out through the first common port 39; the standard liquid for comparison enters the multi-way valve 3 through the standard liquid port 33. The sample for detection enters the multi-way valve 3 through the sample port 36 or the online sample port 37.

[0030] like Figure 2As shown, the two-position three-way valve 5 includes a normally open port 51, a normally closed port 52 and a second common port 53; the liquid flowing through the normally open port 51 or the normally closed port 52 flows out of the two-position three-way valve 5 through the second common port 53. Generally, the normally open port 51 of the two-position three-way valve 5 keeps the flow path unobstructed, and the normally closed port 52 is in a closed state. When the normally closed port 52 is opened, the normally open port 51 is closed; at this time, the liquid flows out of the two-position three-way valve 5 through the normally closed port 52 and the second common port 53. The normally closed port 52 is connected to the cleaning pipeline outside the sampling flow path, and the pure water or cleaning liquid in the cleaning pipeline can enter the two-position three-way valve 5 through the normally closed port 52, and then flow out through the second common port 53, thereby cleaning the two-position three-way valve 5.

[0031] like Figure 2 As shown, the syringe pump 1 includes a circulation port 11, and the circulation port 11 is communicated with the second common port 53. Therefore, when the syringe pump 1 extracts or injects liquid, it needs to pass through the two-position three-way valve 5.

[0032] like Figure 2 As shown, the mixing tube 2 includes a first liquid inlet port 22 and a first liquid outlet port 23. The first liquid inlet port 22 is connected to the first common port 39 on the multi-way valve 3, and the first liquid outlet port 23 is connected to the normally open port 51 on the two-position three-way valve 5.

[0033] Based on the above:

[0034] When the sampling flow path is sampling, extraction is performed through the syringe pump 1; at this time, the normally open port 51 of the two-position three-way valve 5 is in an open state, and the sample or medicine outside the sampling flow path flows out through the first medicine port 31 and / or the second medicine port 32, the sample port 36 or the online sample port 37 on the multi-way valve 3 and then flows out through the first common port 39; the liquid after flowing out enters the interior of the mixing tube 2 through the first liquid inlet port 22 on the mixing tube 2; at this time, the extraction process is completed. Further, when sampling, a section of air can be extracted through the first air port 34 on the multi-way valve 3, and then the sample or medicine can be extracted.

[0035] When the sampling flow path is cleaned, it is extracted through the syringe pump 1; at this time, the normally closed port 52 of the two-position three-way valve 5 is opened, and the normally open port 51 is closed; the cleaning liquid or pure water used for cleaning enters the syringe pump 1 through the normally closed port 52 and the second common port 53 on the two-position three-way valve 5, and the syringe pump 1 is now stored with cleaning liquid or pure water; then the normally closed port 52 is closed, the normally open port 51 is opened, and the cleaning liquid or pure water in the pump is injected into the mixing tube 2 through the second common port 53 and the normally open port 51 on the two-position three-way valve 5 through the syringe pump 1, and in this process, the cleaning of the syringe pump 1, the mixing tube 2 and the two-position three-way valve 5 is completed. The control port of the multi-way valve 3 includes a pure water port 38, and the pure water or cleaning liquid cleans the multi-way valve 3 through the pure water port 38.

[0036] In addition, if Figure 2 As shown, the sampling flow path also includes a section of extension pipe 21. One end of the extension pipe 21 is connected to the first liquid inlet port 22, and the other end of the extension pipe 21 is connected to the first common port 39 on the multi-way valve 3. The extension pipe 21 located in the mixing tube 2 is wound around the mixing tube 2. Specifically, the length of the extension pipe 21 is equivalent to the range of the injection pump 1. By setting the extension pipe 21, the length of the flow path during the sampling process can be extended, thereby preventing the liquid from entering the injection pump 1 during sampling.

[0037] like Figure 2 As shown, a water sample detector 4 is provided on the extension pipe 21 between the mixing tube 2 and the multi-way valve 3. The water sample detector 4 is an existing common device. By adjusting the sensitivity of the water sample detector 4, it can detect whether there is medicine or sample passing through the extension pipe 21 when the injection pump 1 is drawing.

[0038] The sampling flow path is often used in the water quality testing process, so the sampling flow path also includes a digestion system 6. Figure 4 As shown, the left and right sides of the digestion system 6 are respectively provided with LED lights 61 and corresponding detectors 62. The digestion system 6 is a known existing device. The digestion system 6 is connected to the reactor inlet port 35 of the multi-way valve 3, and the liquid in the mixing tube 2 is pushed by the injection pump 1 to enter the digestion system 6 through the reactor inlet port 35 to complete digestion and colorimetry. The digestion system 6 is also provided with an air pipe 63, and the air pipe 63 is connected to the atmosphere.

[0039] like Figure 3 As shown, the sampling flow path also includes a two-position two-way valve 7, which includes a second liquid inlet port 71 and a second liquid outlet port 72. The second liquid inlet port 71 is connected to the first common port 39 of the multi-way valve 3, and the second liquid outlet port 72 is connected to the waste liquid pipe outside the flow path. The waste liquid in the sampling flow path passes through the second liquid outlet port 72 on the two-position two-way valve 7 and is discharged from the sampling flow path.

[0040] Based on the above structure, this application has the following advantages:

[0041] 1. By connecting the mixing tube 2 between the injection pump 1 and the multi-way valve 3, the sample or medicine flowing through the multi-way valve 3 during the sampling process is prevented from entering the injection pump 1, thereby ensuring that there is no sample or medicine residue in the injection pump 1, and extending the service life of the injection pump 1; when performing sampling and testing, the sample and medicine only stay in the mixing tube 2, avoiding the sample and medicine residue in the injection pump 1, improving the liquid collection accuracy, and ensuring the accuracy of the measurement result.

[0042] 2. An extension pipe 21 is provided between the mixing tube 2 and the multi-way valve 3 to extend the sampling process and prevent the liquid in the mixing tube 2 from being drawn into the injection pump 1 due to the extraction of the injection pump 1 .

[0043] 3. A water sample detector 4 is provided on the extension pipe 21 connecting the mixing tube 2 and the multi-way valve 3. By adjusting the sensitivity of the water sample detector 4, it can be more accurately determined whether liquid is extracted.

[0044] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the present invention should be included in the protection scope of the present invention.

Claims

1. A sampling flow path, characterized in that: Including multi-way valve, two-position three-way valve, injection pump and mixing tube; The multi-way valve comprises a first common port and a control port; The two-position three-way valve comprises a normally open port, a normally closed port and a second common port; The injection pump comprises a circulation port; the circulation port is in communication with the second common port; The mixing tube includes a first liquid inlet port and a first liquid outlet port; the first liquid inlet port is connected to the first common port, and the first liquid outlet port is connected to the normally open port.

2. A sampling flow path according to claim 1, characterized in that: It also includes an extension pipe; one end of the extension pipe is connected to the first liquid inlet port, and the other end of the extension pipe is connected to the first common port; the extension pipe located at the mixing pipe part is wound around the mixing pipe.

3. A sampling flow path according to claim 2, characterized in that: A water sample detector is arranged on the extension pipe between the mixing tube and the multi-way valve.

4. A sampling flow path according to claim 1, characterized in that: The control ports of the multi-way valve include a first reagent port, a second reagent port, a standard solution port, a reactor inlet port, a sample port and an online sample port.

5. A sampling flow path according to claim 4, characterized in that: The control port of the multi-way valve also includes a first air port.

6. A sampling flow path according to claim 4, characterized in that: The control port of the multi-way valve also includes a pure water port.

7. A sampling flow path according to claim 4, characterized in that: It also includes a digestion system, which is connected to the reactor inlet port; LED lights and detectors are respectively arranged on the opposite sides of the digestion system.

8. A sampling flow path according to claim 7, characterized in that: The digestion system is provided with an air pipe.

9. A sampling flow path according to claim 4, characterized in that: It also includes a two-position two-way valve; the two-position two-way valve includes a second liquid inlet port, and the second liquid inlet port is connected to the first common port of the multi-way valve.

10. A sampling flow path according to claim 9, characterized in that: The two-position two-way valve further includes a second liquid outlet port, and the second liquid outlet port is connected to a waste liquid pipe outside the flow path.

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