Sampling liquid path system for complex water quality and sampling method

Abstract

The invention discloses a complex water quality sampling liquid path system and a sampling method, belongs to the technical field of water quality monitoring, is used for sampling complex water bodies, and comprises a gas path system, a precipitation system and a sampling system, the gas path system comprises a two-position three-way valve, the two-position three-way valve comprises a first inlet end, a second inlet end and an outlet end, the first inlet end is connected with a positive pressure gas pump, the second inlet end is connected with a negative pressure gas pump, and the outlet end is connected with the precipitation system; the sedimentation system comprises a sedimentation tank, a sealing cover is arranged on the sedimentation tank, an air pipe and a sampling water pipe penetrate through the sealing cover, one end of the air pipe is located at the upper part of the sedimentation tank, and the other end is connected with an outlet end of a two-position three-way valve; the other end of the sampling water pipe is connected with the sampling system; the bottom of the sedimentation tank is communicated with water. The system is provided with an air path system, a positive pressure air pump and a negative pressure air pump can be flexibly used for multiple purposes of liquid pumping and emptying, and the system is flexible in design and high in practicability.

Description

Technical Field

[0001] The invention belongs to the technical field of water quality monitoring, and in particular relates to a sampling liquid path system and a sampling method for complex water quality. Background Art

[0002] In the process of water quality monitoring, it is usually necessary to design a sampling liquid circuit system that meets the water quality. The commonly used sampling liquid circuits on the market generally use submersible pumps and water suction pumps, which can be used normally for general water quality, but are very easy to be blocked for complex water quality with flocculent pollution, and it is difficult to avoid treatment; the use of peristaltic pumps can alleviate the problem of blockage to a certain extent, but the pipes and other consumables of peristaltic pumps are expensive, and the sampling rate is low.

[0003] For example, the invention patent application "A quantitative sampling device for water source environment detection" with publication number CN118329538A discloses a sampling device, including a multi-head sampling mechanism, in which a water suction pump is provided, which is installed in the sampling mechanism by bolts. When in use, the water suction pump is started to sample the liquid. The water suction pump needs to be placed underwater to work, and it is inevitable that the pump blades will be blocked.

[0004] The present invention innovatively utilizes the combined use of positive and negative pressure pumps. During use, the pump does not contact the liquid and has no blades, so there is no clogging problem and the power requirement for the pump is also low. Summary of the invention

[0005] The purpose of the present invention is to provide a sampling liquid path system and a sampling method for complex water quality to solve the technical problems mentioned in the above background technology.

[0006] In order to achieve the above-mentioned purpose, the present invention discloses a complex water quality sampling liquid circuit system and sampling method, including a gas circuit system, a precipitation system and a sampling system;

[0007] The gas circuit system comprises a two-position three-way valve, the two-position three-way valve comprises a first inlet end, a second inlet end and an outlet end, the first inlet end is connected to a positive pressure air pump, the second inlet end is connected to a negative pressure air pump, and the outlet end is connected to a precipitation system;

[0008] The sedimentation system comprises a sedimentation tank, a sealing cover is provided on the sedimentation tank, an air pipe and a sampling water pipe are passed through the sealing cover, one end of the air pipe is located at the upper part of the sedimentation tank, and the other end is connected to the outlet end of the two-position three-way valve; one end of the sampling water pipe is located in the middle part of the sedimentation tank, and the other end is connected to the sampling system;

[0009] The bottom of the sedimentation tank is communicated with the water body.

[0010] Furthermore, the sedimentation system includes a sedimentation tank, a first electromagnetic ball valve and a filter screen which are sequentially connected through a first pipe; one end of the first pipe is connected to the bottom of the sedimentation tank, and the other end is connected to the filter screen, and the filter screen is located in the water body.

[0011] Furthermore, a first liquid level sensor is provided in the sedimentation tank.

[0012] Furthermore, the sampling system includes multiple groups of sampling pipelines arranged in parallel; each group of the sampling pipelines includes a second electromagnetic ball valve and a sampling cup connected in sequence through a second pipeline; one end of the second pipeline is connected to the sampling water pipe, and the other end is connected to the bottom of the sampling cup.

[0013] Furthermore, a second liquid level sensor is provided in the sampling cup.

[0014] Furthermore, the first inlet end is a normally open end, and the second inlet end is a normally closed end.

[0015] Furthermore, the interior of the sampling cup is connected to an external detection device.

[0016] Furthermore, the sampling cup is at the same level as the sedimentation tank.

[0017] The present invention also claims a method for sampling the above-mentioned complex water quality sampling liquid path system, comprising the following steps:

[0018] (1) Sampling, filtration and sedimentation: Turn on the negative pressure air pump and the second inlet end, and under the action of the negative pressure air pump, negative pressure is formed in the sedimentation tank, and the water in the water body enters the sedimentation tank; then turn off the negative pressure air pump and the second inlet end, and the water in the sedimentation tank begins to precipitate, forming a sedimentation layer and a supernatant layer;

[0019] (2) Sampling to the sampling system: Turn on the positive pressure air pump and the first inlet end, the positive pressure air pump pumps gas into the sedimentation tank, and the liquid in the supernatant layer is pumped into the sampling system under the action of the positive pressure air pressure;

[0020] (3) Liquid drainage: Close the positive pressure air pump, negative pressure air pump, first inlet port and second inlet port. The water in the sedimentation tank will be automatically drained under the action of gravity.

[0021] Furthermore, in step (3), the positive pressure air pump and the first inlet end, and the negative pressure air pump and the second inlet end are alternately opened or closed to promote complete emptying of the liquid in the sampling liquid path system.

[0022] Compared with the prior art, the complex water quality sampling liquid path system and sampling method of the present invention have the following advantages:

[0023] (1) In the present invention, an air circuit system is provided, which can flexibly call a positive pressure air pump and a negative pressure air pump for multi-purpose use of pumping and emptying, and the design is flexible and practical.

[0024] (2) In the present invention, a filter screen and a sedimentation system are provided, and the water body can be filtered and precipitated multiple times, which is suitable for sampling complex water bodies.

[0025] (3) The present invention uses a positive pressure air pump and a negative pressure air pump to provide power. Unlike vane pumps such as submersible pumps and self-priming pumps used in conventional technologies, the present invention does not directly contact the liquid and will not be blocked by foreign matter, dirt, and mud.

[0026] (4) The sedimentation tank and the sampling cup in the present invention are matched, and the power requirement of the air pump is low, and the power consumption and cost are also lower.

[0027] (5) The sampling liquid path system of the present invention is simple and easy to disassemble for use, convenient to repair and replace, fully functional, and has low equipment investment cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 : A schematic structural diagram of a sampling pipeline system for complex water quality of the present invention.

[0029] Among them, 1. two-position three-way valve; 2. first inlet end; 3. second inlet end; 4. outlet end; 5. positive pressure air pump; 6. negative pressure air pump; 7. air pipe; 8. sedimentation tank; 81. supernatant layer; 82. sedimentation layer; 9. first electromagnetic ball valve; 10. filter screen; 11. first liquid level sensor; 12. sealing cover; 13. sampling water pipe; 14. first pipeline; 15. second pipeline; 16. second electromagnetic ball valve; 17. sampling cup; 18. second liquid level sensor; 19. external detection equipment. DETAILED DESCRIPTION

[0030] The technical solution of the present invention is described in detail below through specific embodiments.

[0031] The invention discloses a sampling pipeline system for complex water quality, which is used for sampling complex water bodies and comprises a gas path system, a sedimentation system and a sampling system.

[0032] Specifically, the gas circuit system includes a two-position three-way valve 1, which includes a first inlet end 2, a second inlet end 3 and an outlet end 4. The first inlet end 2 is connected to a positive pressure air pump 5, the second inlet end 3 is connected to a negative pressure air pump 6, and the outlet end 4 is connected to a precipitation system. The first inlet end 2 is a normally open end, and the second inlet end 3 is a normally closed end.

[0033] Specifically, the sedimentation system includes a sedimentation tank 8, a first electromagnetic ball valve 9 and a filter screen 10 which are sequentially connected through a first pipe 14; one end of the first pipe 14 is connected to the bottom of the sedimentation tank 8, and the other end is connected to the filter screen 10, and the filter screen 10 is located in the water body. A first liquid level sensor 11 is provided in the sedimentation tank 8. A sealing cover 12 is provided on the sedimentation tank 8, and an air pipe 7 and a sampling water pipe 13 are penetrated in the sealing cover 12. One end of the air pipe 7 is located at the upper part of the sedimentation tank 8, and the other end is connected to the outlet end 4 of the two-position three-way valve 1; one end of the sampling water pipe 13 is located in the middle of the sedimentation tank 8, and the other end is connected to the sampling system.

[0034] Specifically, the sampling system includes a plurality of sampling pipelines arranged in parallel; each sampling pipeline includes a second electromagnetic ball valve 16 and a sampling cup 17 which are sequentially connected through a second pipeline 15; one end of the second pipeline 15 is connected to the sampling water pipe 13, and the other end is connected to the bottom of the sampling cup 17. A second liquid level sensor 18 is arranged in the sampling cup 17, and the interior of the sampling cup 17 is connected to an external detection device 19 through a pipeline, so that the sampled water can be analyzed.

[0035] Furthermore, in the present invention, the sampling cup 17 is arranged at the same level as the sedimentation tank 8 .

[0036] In a specific embodiment, the sampling pipeline is arranged in two groups, such as Figure 1 As shown, two sets of sampling pipelines are arranged in parallel, and two samples can be taken at the same time to analyze the water body, thereby improving the accuracy of the analysis.

[0037] The sampling method of the complex water quality sampling liquid path system described in the present invention comprises the following steps:

[0038] (1) Sampling, filtration and sedimentation: The negative pressure air pump 6, the second inlet port 3 and the first electromagnetic ball valve 9 are turned on. Under the action of the negative pressure air pump 6, negative pressure is formed in the sedimentation tank 8. The water in the water body enters through the filter 10 and gradually enters the sedimentation tank 8 through the first electromagnetic ball valve 9. As the liquid level in the sedimentation tank 8 rises to the liquid level set by the first liquid level sensor 11, the first liquid level sensor 11 sends a signal to close the first electromagnetic ball valve 9, the negative pressure air pump 6 and the second inlet port 3. At this time, the water in the sedimentation tank 8 begins to settle, and the turbid sewage is stratified to form a sedimentation layer 82 and a supernatant layer 81.

[0039] (2) Sampling to the sampling system: the positive pressure air pump 5, the first inlet port 2, and the second electromagnetic ball valve 16 are turned on. The positive pressure air pump 5 pumps a suitable flow of gas into the sedimentation tank 8 and injects it into the closed sedimentation tank 8. Under the action of positive pressure and siphon, the liquid in the supernatant layer 81 is pumped into the sampling system and sent into the sampling cup 17 along the bottom of the sampling cup 17. When the liquid reaches the set liquid level of the second liquid level sensor 18, the positive pressure air pump 5, the first inlet port 2, and the second electromagnetic ball valve 16 are closed to complete the sampling;

[0040] In the present invention, since the heights of the sampling cup 17 and the sedimentation tank 8 are consistent, due to the principle of communicating vessels, when the second electromagnetic ball valve 16 is opened, the liquid levels of the sampling cup 17 and the sedimentation tank 8 will automatically tend to be consistent, and the sampling cup 17 will not overflow.

[0041] (3) Liquid drainage: close the positive pressure air pump 5, the negative pressure air pump 6, the first inlet port 2 and the second inlet port 3, open the first electromagnetic ball valve 9 and the second electromagnetic ball valve 16, and the water in the sedimentation tank 8 will be automatically drained under the action of gravity;

[0042] At the same time, the two-position three-way valve 1, the positive pressure air pump 5 and the negative pressure air pump 6 can be opened or closed alternately to make the liquid in the sampling system flow into the sedimentation tank 8 as quickly as possible, thereby promoting the emptying efficiency of the liquid, providing higher emptying energy, and purifying the pipeline.

[0043] For example, close the first electromagnetic ball valve 9, open the second electromagnetic ball valve 16, the negative pressure air pump 6 and the second inlet end 3, form a negative pressure in the sedimentation tank 8, and promote the liquid in the sampling system to enter the sedimentation tank 8; then open the first electromagnetic ball valve 9, the positive pressure air pump 5 and the first inlet end 2, close the second electromagnetic ball valve 16, the negative pressure air pump 6 and the second inlet end 3, pump gas into the sedimentation tank 8, and promote the liquid in the sedimentation tank 8 to be emptied into the water body as soon as possible. Repeat the above operation several times to completely empty the liquid in the sampling liquid path system.

[0044] The above description is only a preferred embodiment of the present invention and is not intended to limit the invention. Any modifications, equivalent substitutions, improvements, etc. made within the design concept of the present invention should be included in the protection scope of the present invention.

Claims

1. A complex water quality sampling liquid path system, used for sampling complex water bodies, characterized by: Including gas system, sedimentation system and sampling system; The gas circuit system comprises a two-position three-way valve, the two-position three-way valve comprises a first inlet end, a second inlet end and an outlet end, the first inlet end is connected to a positive pressure air pump, the second inlet end is connected to a negative pressure air pump, and the outlet end is connected to a precipitation system; The sedimentation system comprises a sedimentation tank, a sealing cover is provided on the sedimentation tank, an air pipe and a sampling water pipe are passed through the sealing cover, one end of the air pipe is located at the upper part of the sedimentation tank, and the other end is connected to the outlet end of the two-position three-way valve; one end of the sampling water pipe is located in the middle part of the sedimentation tank, and the other end is connected to the sampling system; The bottom of the sedimentation tank is communicated with the water body.

2. The complex water quality sampling liquid path system according to claim 1, characterized in that: The sedimentation system comprises a sedimentation tank, a first electromagnetic ball valve and a filter screen which are sequentially connected through a first pipeline; one end of the first pipeline is connected to the bottom of the sedimentation tank, and the other end is connected to the filter screen, and the filter screen is located in the water body.

3. The complex water quality sampling liquid path system according to claim 1, characterized in that: A first liquid level sensor is arranged in the sedimentation tank.

4. The complex water quality sampling liquid path system according to claim 1, characterized in that: The sampling system comprises a plurality of sampling pipelines arranged in parallel; each sampling pipeline comprises a second electromagnetic ball valve and a sampling cup connected in sequence through a second pipeline; one end of the second pipeline is connected to a sampling water pipe, and the other end is connected to the bottom of the sampling cup.

5. The complex water quality sampling liquid path system according to claim 1, characterized in that: A second liquid level sensor is arranged in the sampling cup.

6. The complex water quality sampling liquid path system according to claim 1, characterized in that: The first inlet end is a normally open end, and the second inlet end is a normally closed end.

7. The complex water quality sampling liquid path system according to claim 1, characterized in that: The interior of the sampling cup is connected to an external detection device.

8. The complex water quality sampling liquid path system according to claim 1, characterized in that: The sampling cup is at the same level as the sedimentation tank.

9. The sampling method of a sampling liquid path system for complex water quality according to any one of claims 1 to 8, characterized in that: The steps include: (1) Sampling, filtration and sedimentation: Turn on the negative pressure air pump and the second inlet end, and under the action of the negative pressure air pump, negative pressure is formed in the sedimentation tank, and the water in the water body enters the sedimentation tank; then turn off the negative pressure air pump and the second inlet end, and the water in the sedimentation tank begins to precipitate, forming a sedimentation layer and a supernatant layer; (2) Sampling to the sampling system: Turn on the positive pressure air pump and the first inlet end, the positive pressure air pump pumps gas into the sedimentation tank, and the liquid in the supernatant layer is pumped into the sampling system under the action of the positive pressure air pressure; (3) Liquid drainage: Close the positive pressure air pump, negative pressure air pump, first inlet port and second inlet port. The water in the sedimentation tank will be automatically drained under the action of gravity.

10. The sampling method of the sampling liquid path system of complex water quality as claimed in claim 9, characterized in that: In step (3), the positive pressure air pump and the first inlet end, and the negative pressure air pump and the second inlet end are alternately opened or closed to promote complete emptying of the liquid in the sampling liquid path system.

Images