Waterway structure of quality control instrument

Abstract

The utility model discloses a waterway structure of a quality control instrument, which comprises a standard liquid pool, a refrigeration cup device, a first displacement pump, a second displacement pump, a cleaning pump, an emptying pump, a first switching valve, a second switching valve, a third switching valve and a fourth switching valve, the refrigeration cup device is connected with the first displacement pump, the cleaning pump is connected with the second displacement pump, the emptying pump is connected with the standard liquid pool, and the first switching valve is connected with the second switching valve. The first switching valve is used for selecting one of the first displacement pump and the second displacement pump to be communicated with the second switching valve, the second switching valve is used for selecting one of the standard liquid pool and the first waste liquid pipe to be communicated with the first switching valve, and the third switching valve is connected with the second waste liquid pipe, the air pipe and the emptying pump; the third switching valve is used for selectively communicating one of the second waste liquid pipe and the air pipe with the emptying pump, the fourth switching valve is connected with the pure water pipe, the sample pipe and the cleaning pump, and the fourth switching valve is used for selectively communicating one of the pure water pipe and the sample pipe with the cleaning pump. The device is simple in overall structure, capable of flexibly adjusting and configuring the volume and the concentration of standard liquid, and diversified in function.

Description

Technical Field

[0001] The utility model relates to the technical field of water quality analysis, and particularly relates to a water circuit structure of a quality control instrument. Background Art

[0002] A quality control instrument is an instrument used to verify or calibrate an on-line monitoring instrument with a standard liquid. Its principle is that the quality control instrument transports a specified standard substance to the on-line analyzer, reads the measured data of the on-line analyzer, and compares the measured data with the concentration value of the standard substance, so as to judge the working state of the on-line monitoring instrument and the quality of the measured data. With the increasingly strict supervision of water quality monitoring, the demand for quality control instruments is also increasing. Whether the quality control instrument can accurately measure and flexibly adjust the volume and concentration of the configured standard solution is particularly important. Most of the current quality control instruments have the problem of being unable to flexibly adjust the volume and concentration of the configured standard solution.

[0003] For example, the Chinese utility model patent with the application number CN201920770437.1 discloses a water quality quality control flow path and a quality control instrument. Its water quality quality control flow path includes a pipeline evacuation pump, an injection three-way valve, a standard solution bottle group and a quality control injection multi-channel valve. The normally open port of the injection three-way valve is connected to the quality control injection multi-channel valve through a pipeline, and the standard solution bottle group is connected to the quality control injection multi-channel valve. The common port of the injection three-way valve is connected to the water quality analyzer for detecting water samples; the pipeline evacuation pump is arranged between the injection three-way valve and the quality control injection multi-channel valve. The quality control injection multi-channel valve includes a plurality of valves, and the plurality of valves are respectively communicated with the standard solution bottle group to transport the standard solution in the standard solution bottle group to the water quality analyzer, so that the water quality analyzer can measure a variety of standard solutions with different concentrations, and the pipeline evacuation pump can be used to evacuate the accumulated liquid in the pipeline or rinse the pipeline with the standard solution in the standard solution bottle group, which can improve the detection accuracy of the water quality analyzer. This water quality quality control flow path can only output several concentration standard solutions contained in the standard solution bottle group for quality control, cannot flexibly adjust the volume and concentration of the configured standard solution, and cannot cover the full range of the quality control instrument. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a water circuit structure of a quality control instrument to solve the problem that the existing quality control instrument cannot flexibly adjust the volume and concentration of the configured standard solution.

[0005] To achieve the above purpose, the technical solution proposed by the utility model is as follows:

[0006] A water circuit structure of a quality control instrument, comprising: a standard solution pool, a refrigerating cup device, a first displacement pump, a second displacement pump, a cleaning pump, a drain pump, a first switching valve, a second switching valve, a third switching valve and a fourth switching valve. The refrigerating cup device is connected to the first displacement pump, the cleaning pump is connected to the second displacement pump, and the drain pump is connected to the standard solution pool. The first switching valve is respectively connected to the first displacement pump, the second displacement pump and the second switching valve, and the first switching valve is used to selectively connect the first displacement pump and the second displacement pump to the second switching valve. The second switching valve is respectively connected to the standard solution pool and the first waste liquid pipe, and the second switching valve is used to selectively connect the standard solution pool and the first waste liquid pipe to the first switching valve. The third switching valve is respectively connected to the second waste liquid pipe, the air pipe and the drain pump, and the third switching valve is used to selectively connect the second waste liquid pipe and the air pipe to the drain pump. The fourth switching valve is respectively connected to the pure water pipe, the sample pipe and the cleaning pump, and the fourth switching valve is used to selectively connect the pure water pipe and the sample pipe to the cleaning pump.

[0007] Preferably, the first switching valve, the second switching valve, the third switching valve and the fourth switching valve are all two-position three-way valves.

[0008] Further, the normally closed port of the first switching valve is connected to the liquid outlet of the first displacement pump, the normally open port of the first switching valve is connected to the liquid outlet of the second displacement pump, and the common port of the first switching valve is connected to the common port of the second switching valve. The liquid inlet of the first displacement pump is connected to the refrigerating cup device. The normally closed port of the second switching valve is connected to the standard solution pool, and the normally open port of the second switching valve is connected to the first waste liquid pipe. The normally closed port of the third switching valve is connected to the second waste liquid pipe, the normally open port of the third switching valve is connected to the air pipe, and the common port of the third switching valve is connected to the drain pump. The normally closed port of the fourth switching valve is connected to the pure water pipe, the normally open port of the fourth switching valve is connected to the sample pipe, and the common port of the fourth switching valve is connected to the liquid inlet of the cleaning pump. The liquid outlet of the cleaning pump is connected to the liquid inlet of the second displacement pump.

[0009] Preferably, both the first displacement pump and the second displacement pump are plunger pumps.

[0010] Preferably, the displacement of the first displacement pump is 1 ml / r, and the displacement of the second displacement pump is 20 ml / r.

[0011] Preferably, it further includes check valves, and check valves are respectively installed at the liquid inlets and outlets of the first displacement pump and the second displacement pump.

[0012] Preferably, it further includes a multi-way valve connected to the standard solution pool.

[0013] Preferably, the evacuation pump is a forward and reverse evacuation pump, and the flow directions of the conveyed media during forward and reverse rotations are opposite.

[0014] Preferably, it further includes a water sample detector, which is installed on the pipeline connecting the standard solution pool and the second switching valve.

[0015] Preferably, it further includes a controller, which is electrically connected to the refrigerating cup device, the first displacement pump, the second displacement pump, the cleaning pump, the evacuation pump, the first switching valve, the second switching valve, the third switching valve, the fourth switching valve, and the water sample detector respectively.

[0016] Adopting the above technical solutions, the beneficial effects of the present utility model are as follows:

[0017] 1. The overall structure of the water circuit structure of the quality control instrument of the present utility model is simple, which is conducive to the miniaturization of the quality control instrument.

[0018] 2. The water circuit structure of the quality control instrument of the present utility model can flexibly adjust the volume and concentration of the configured standard solution, and can densely cover the full range of water quality on-line monitoring instruments in quality control applications.

[0019] 3. The water circuit structure of the quality control instrument of the present utility model can configure two kinds of liquids with different requirements, namely the verification liquid and the water sample spike solution, with diverse functions and convenient use.

[0020] 4. The water circuit structure of the quality control instrument of the present utility model realizes the control of evacuating the standard solution or entering the standard solution pool by setting the second switching valve. The standard solution rinsing and cleaning of the pipeline are very convenient, and it is also convenient for mixing, which can effectively avoid cross-contamination and improve the accuracy of the detection results. Description of the Drawings

[0021] Figure 1 It is the water circuit diagram of a certain preferred embodiment of the present utility model.

[0022] Wherein: 1. Standard solution pool; 2. Refrigerating cup device; 3. First displacement pump; 4. Second displacement pump; 5. Cleaning pump; 6. Evacuation pump; 7. First switching valve; 8. Second switching valve; 9. Third switching valve; 10. Fourth switching valve; 11. First waste liquid pipe; 12. Second waste liquid pipe; 13. Air pipe; 14. Pure water pipe; 15. Sample pipe; 16. Water sample detector; 17. Multi-way valve. Detailed Embodiments

[0023] The following further describes the present utility model in conjunction with the drawings and specific embodiments.

[0024] Refer to Figure 1 , Figure 1The water circuit structure of the quality control instrument according to this embodiment is shown. The water circuit structure of this quality control instrument includes a standard solution pool 1, a refrigerating cup device 2, a first displacement pump 3, a second displacement pump 4, a cleaning pump 5, an evacuation pump 6, a first switching valve 7, a second switching valve 8, a third switching valve 9, and a fourth switching valve 10.

[0025] The first switching valve 7, the second switching valve 8, the third switching valve 9, and the fourth switching valve 10 in this embodiment are all preferably two-way three-way valves. The two-way three-way valve includes: a normally closed port NO, a common port COM, and a normally open port NC.

[0026] The first displacement pump 3 and the second displacement pump 4 in this embodiment can be selected from gear pumps, vane pumps, piston pumps, adjustable displacement variable pumps, syringe pumps, etc. The first displacement pump 3 is preferably a piston pump with a displacement of 1 ml / r, and the second displacement pump 4 is preferably a piston pump with a displacement of 20 ml / r.

[0027] The evacuation pump 6 in this embodiment is a forward and reverse evacuation pump 6, and the flow directions of the conveying media during its forward and reverse rotations are opposite.

[0028] The connections between the fittings in this embodiment are all made by water pipelines. Specifically, the liquid outlet of the refrigerating cup device 2 is connected to the liquid inlet of the first displacement pump 3, the liquid outlet of the first displacement pump 3 is connected to the normally closed port of the first switching valve 7, the common port of the first switching valve 7 is connected to the common port of the second switching valve 8, and the normally open port of the first switching valve 7 is connected to the liquid outlet of the second displacement pump 4. The normally closed port of the second switching valve 8 is connected to the standard solution pool 1, and the normally open port of the second switching valve 8 is connected to the first waste liquid pipe 11. The liquid inlet of the second displacement pump 4 is connected to the liquid outlet of the cleaning pump 5, the liquid inlet of the cleaning pump 5 is connected to the common port of the fourth switching valve 10, the normally closed port of the fourth switching valve 10 is connected to the pure water pipe 14, and the normally open port is connected to the sample pipe 15. When pure water is introduced, verification liquid is prepared, and when a sample is introduced, a water sample plus a standard solution is prepared. Two different liquids can be configured separately. The bottom outlet of the standard solution pool 1 is connected to the evacuation pump 6, the evacuation pump 6 is connected to the common port of the third switching valve 9, the normally closed port of the third switching valve 9 is connected to the second waste liquid pipe 12, and the normally open port is connected to the air pipe 13.

[0029] To prevent backflow, check valves are installed at both the liquid inlets and outlets of the first displacement pump 3 and the second displacement pump 4 in this embodiment, so that the liquid to be diluted contained in the refrigerating cup device 2 flows unidirectionally from the refrigerating cup device 2 towards the first switching valve 7, and the pure water / sample flows unidirectionally from the pure water pipe 14 / sample pipe 15 towards the first switching valve 7, preventing backflow.

[0030] A water sample detector 16 can be installed on the connecting pipeline between the standard solution pool 1 and the second switching valve 8 to detect in real time whether the required liquid to be diluted is drawn into the standard solution pool 1.

[0031] The water circuit structure of the quality control instrument in this embodiment further includes a controller (not shown in the figure). The first switching valve 7, the second switching valve 8, the third switching valve 9, and the fourth switching valve 10 are all electrically controlled valves. The controller is electrically connected to the standard solution pool 1, the refrigerating cup device 2, the first displacement pump 3, the second displacement pump 4, the cleaning pump 5, the evacuation pump 6, the first switching valve 7, the second switching valve 8, the third switching valve 9, the fourth switching valve 10, and the water volume detector to control their working states, thereby improving the degree of automation, reducing the degree of manual participation, and reducing the workload of the staff.

[0032] The standard solution pool 1 is also connected to a multi-way valve 17, such as a six-way valve, for use in verifying the standard solution of multiple instruments.

[0033] The overall structure of the water circuit structure of the quality control instrument in this embodiment is simple, which is conducive to the miniaturization of the quality control instrument and convenient for carrying. It controls the evacuation or entry of the standard solution into the standard solution pool 1 through the second switching valve 8, facilitating the rinsing of the standard solution and the cleaning of the pipeline, and also facilitating mixing.

[0034] The water circuit structure of the quality control instrument in this embodiment can be configured with verification liquid or water sample spiked standard solution, and the working principle is as follows:

[0035] 1. Configuration of verification liquid

[0036] S1. Cleaning: Open the second switching valve 8 and the fourth switching valve 10, turn on the cleaning pump 5, pump pure water to clean the standard solution pool 1, and at the same time, the evacuation pump 6 rotates in reverse for air bubbling and mixing to improve the cleaning effect.

[0037] S2. Evacuation: Open the third switching valve 9, and at the same time, the evacuation pump 6 rotates forward to evacuate the cleaning waste liquid in the standard solution pool 1.

[0038] S3. Rinsing: Calculate the last use time. If the time interval since the last extraction of the standard solution is more than three days, open the first switching valve 7, use the first displacement pump 3 to extract the standard solution from the refrigerating cup device 2 and then discharge it to rinse the standard solution in the pipeline to prevent the standard solution from expiring due to not being in the refrigerating cup device 2 (mainly referring to the residual standard solution in the pipeline). After rinsing, close the first switching valve 7, open the fourth switching valve 10, turn on the cleaning pump 5, and use pure water to clean the residual rinsing standard solution in the pipeline. If the interval is less than three days, skip this step.

[0039] S4. Extracting standard solution: Open the first switching valve 7 and the second switching valve 8, and then accurately extract a quantitative standard solution with the first displacement pump 3 according to the configured standard solution volume set manually / automatically / remotely, and discharge the standard solution into the standard solution pool 1.

[0040] S5. Dilution: Open the second switching valve 8, and then use the second displacement pump 4 to inject 20 ml of pure water in the second displacement pump 4 into the standard solution pool 1.

[0041] S6. Supplementary pure water: Open the fourth switching valve 10 and the cleaning pump 5 to fill the second displacement pump 4 with pure water.

[0042] Repeat steps S5 and S6 five times so that there is 100 ml of pure water in the standard solution cell 1.

[0043] S7. Mixing: The evacuation pump 6 rotates in reverse to draw air into the standard solution cell 1 to mix the standard solution and pure water.

[0044] S8. Waiting: After the configuration is completed, wait for the instrument to extract the verification solution for analysis.

[0045] S9. Cleaning: Open the second switching valve 8, the fourth switching valve 10 and the cleaning pump 5 to draw pure water to clean the standard solution cell 1.

[0046] S10. Evacuation: Open the third switching valve 9, the evacuation pump 6 rotates forward to evacuate the cleaning waste liquid in the standard solution cell 1.

[0047] S11. End: Wait for the next execution.

[0048] 2. Preparation of water sample with added standard solution

[0049] S1. Cleaning: Open the second switching valve 8 and the cleaning pump 5 to draw the sample to clean the standard solution cell 1. At the same time, the evacuation pump 6 rotates in reverse for air bubbling and mixing to improve the cleaning effect.

[0050] S2. Evacuation: Open the third switching valve 9, the evacuation pump 6 rotates forward to evacuate the cleaning waste liquid in the standard solution cell 1.

[0051] S3. Rinsing: Calculate the last use time. If the time interval since the last extraction of the standard solution is more than three days, open the first switching valve 7 and use the first displacement pump 3 to extract the standard solution from the refrigerating cup device 2 to rinse the pipeline to prevent the standard solution from expiring due to not being in the refrigerating cup. After rinsing, close the first switching valve 7 and open the cleaning pump 5 to use the sample to clean the residual rinsing standard solution in the pipeline. If the interval is less than three days, skip this step.

[0052] S4. Adding standard solution: Open the first switching valve 7 and the second switching valve 8, and then accurately extract a quantitative standard solution according to the configured standard solution volume set manually / automatically / remotely and discharge it into the standard solution cell 1 with the first displacement pump 3.

[0053] S5. Dilution: Open the second switching valve 8, and then use the second displacement pump 4 to inject 20 ml of the sample in the second displacement pump 4 into the standard solution cell 1.

[0054] S6. Supplementary sample: Open the cleaning pump 5 to fill the second displacement pump 4 with the sample.

[0055] Repeat steps S5 and S6 five times so that there is 100 ml of the sample in the standard solution cell 1.

[0056] S7. Mixing: The drain pump 6 rotates in reverse, sucking air into the standard solution tank 1 to mix the standard solution and the sample.

[0057] S8. Waiting: After the configuration is completed, wait for the instrument to extract the spiked solution for analysis.

[0058] S9. Cleaning: Open the second switching valve 8, the fourth switching valve 10 and the cleaning pump 5 to extract pure water to clean the standard solution tank 1.

[0059] S10. Draining: Open the third switching valve 9, the drain pump 6 rotates forward to drain the cleaning waste liquid in the standard solution tank 1.

[0060] S11. End: Wait for the next execution.

[0061] Although the present invention has been specifically shown and described in conjunction with the preferred embodiments, those skilled in the art should understand that various changes can be made to the present invention in terms of form and details without departing from the spirit and scope of the present invention defined by the appended claims, and all such changes are within the protection scope of the present invention.

Claims

1. A water channel structure of a quality control instrument, characterized in that: include: A standard liquid tank (1), a refrigeration cup device (2), a first displacement pump (3), a second displacement pump (4), a cleaning pump (5), an emptying pump (6), a first switching valve (7), a second switching valve (8), a third switching valve (9) and a fourth switching valve (10); The refrigeration cup device (2) is connected to the first displacement pump (3), the cleaning pump (5) is connected to the second displacement pump (4), and the emptying pump (6) is connected to the standard liquid pool (1); The first switching valve (7) is connected to the first displacement pump (3), the second displacement pump (4) and the second switching valve (8) respectively, and the first switching valve (7) is used to connect one of the first displacement pump (3) and the second displacement pump (4) to the second switching valve (8); The second switching valve (8) is connected to the standard liquid pool (1) and the first waste liquid pipe (11) respectively, and the second switching valve (8) is used to connect one of the standard liquid pool (1) and the first waste liquid pipe (11) to the first switching valve (7); The third switching valve (9) is connected to the second waste liquid pipe (12), the air pipe (13) and the emptying pump (6) respectively, and the third switching valve (9) is used to connect one of the second waste liquid pipe (12) and the air pipe (13) to the emptying pump (6); The fourth switching valve (10) is connected to the pure water pipe (14), the sample pipe (15) and the cleaning pump (5) respectively, and the fourth switching valve (10) is used to connect the pure water pipe (14) and the sample pipe (15) to the cleaning pump (5).

2. The water channel structure of the quality control instrument according to claim 1 is characterized in that: The first switching valve (7), the second switching valve (8), the third switching valve (9) and the fourth switching valve (10) are all two-position three-way valves.

3. The water channel structure of the quality control instrument according to claim 2 is characterized in that: The normally closed port of the first switching valve (7) is in communication with the liquid outlet of the first displacement pump (3), the normally open port of the first switching valve (7) is in communication with the liquid outlet of the second displacement pump (4), and the common port of the first switching valve (7) is in communication with the common port of the second switching valve (8); The liquid inlet of the first displacement pump (3) is in communication with the refrigeration cup device (2); The normally closed port of the second switching valve (8) is connected to the standard liquid pool (1), and the normally open port of the second switching valve (8) is connected to the first waste liquid pipe (11); The normally closed port of the third switching valve (9) is connected to the second waste liquid pipe (12), the normally open port of the third switching valve (9) is connected to the air pipe (13), and the common port of the third switching valve (9) is connected to the drain pump (6); The normally closed port of the fourth switching valve (10) is connected to the pure water pipe (14), the normally open port of the fourth switching valve (10) is connected to the sample tube (15), and the common port of the fourth switching valve (10) is connected to the liquid inlet of the cleaning pump (5); The liquid outlet of the cleaning pump (5) is connected to the liquid inlet of the second displacement pump (4).

4. The water channel structure of the quality control instrument according to claim 1 is characterized in that: The first displacement pump (3) and the second displacement pump (4) are both plunger pumps.

5. The water channel structure of the quality control instrument according to claim 4 is characterized in that: The displacement of the first displacement pump (3) is 1 ml / r, and the displacement of the second displacement pump (4) is 20 ml / r.

6. The water channel structure of the quality control instrument according to claim 1, characterized in that: It also includes a one-way valve, and the liquid inlet and liquid outlet of the first displacement pump (3) and the second displacement pump (4) are respectively equipped with a one-way valve.

7. The water channel structure of the quality control instrument according to claim 1, characterized in that: It also includes a multi-way valve (17) connected to the standard liquid pool (1).

8. The water channel structure of the quality control instrument according to claim 1, characterized in that: The emptying pump (6) is a forward and reverse emptying pump (6), and the forward and reverse conveying medium flow directions are opposite.

9. The water channel structure of the quality control instrument according to any one of claims 1 to 8, characterized in that: It also includes a water sample detector (16) installed on a pipeline connecting the standard liquid pool (1) and the second switching valve (8).

10. The water channel structure of the quality control instrument according to claim 9, characterized in that: The invention also comprises a controller, wherein the controller is electrically connected to the refrigeration cup device (2), the first displacement pump (3), the second displacement pump (4), the cleaning pump (5), the emptying pump (6), the first switching valve (7), the second switching valve (8), the third switching valve (9), the fourth switching valve (10) and the water sample detector (16).

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