Underway type automatic sampling, preprocessing and sample reserving system

Abstract

The invention discloses a sailing type automatic sampling, preprocessing and sample reserving system. The system depends on a first three-way valve, a second three-way valve, a sampling pump, a third three-way valve, a fourth three-way valve, a filtering module, a fifth three-way valve, a sixth three-way valve and a sampling cup which are sequentially communicated and connected through a flow path; the first three-way valve is in flow path connection with the water sample cup and the waste liquid cup; the second three-way valve is additionally communicated with a sampling bottle; the third three-way valve is additionally communicated with a sample reserving bottle; switching channels and / or opening channels of the three-way valves are / is controlled by the control center, and meanwhile, a sample reserving channel, a sampling and preprocessing channel and a sampling channel are realized; and implementing a first backwash flow path and a second backwash flow path. According to the technical scheme, through unified control of the central control system, the functions of automatic sampling, automatic sample reserving, filtering treatment, filtrate collection, linkage detection of an analyzer, automatic waste discharge of filtrate and water samples not exceeding the standard and the like of seawater are achieved, and reliable technical support is provided for marine ecological civilization construction and disaster early warning.

Description

Technical Field

[0001] The present invention relates to the field of detection of geological waters such as oceans, and in particular to a travelling automatic sampling, pre-processing and sample retention system. Background Art

[0002] Traditional marine water quality monitoring mainly relies on manual sampling by survey vessels, and the water samples are collected and then transported to shore-based laboratories for analysis. However, this model has significant technical bottlenecks: the sampling process is limited by the ship's operating window and personnel configuration, and the samples cannot be sent to the laboratory for testing until the end of the voyage, resulting in a lag of several days to several weeks in the feedback of test data, which makes it difficult to meet the needs of emergency response to sudden pollution incidents and dynamic tracking of ecological processes. At the same time, samples are easily affected by environmental factors such as temperature and light during transportation, which may cause degradation or contamination of the substances to be tested, reducing data reliability. In addition, the traditional operating model relies on high-intensity manual operations, and has problems such as low sampling efficiency, high labor costs, and limited spatial and temporal resolution of data. It can no longer meet the needs of large-scale, high-frequency, and long-term marine ecological environment monitoring.

[0003] In recent years, the industry has attempted to introduce automated sampling equipment to improve efficiency, but existing technologies have largely focused on improving a single process. For example, basic sampling devices aboard unmanned vessels still require manual intervention for sample pretreatment (such as filtration and packaging) and storage management, and lack deep integration with online monitoring instruments. Water sampling, in particular, is still manually collected and stored, with no reports of automated sampling devices. This leads to a disconnect in the sample data chain within automated sampling and pretreatment systems, making it impossible to support subsequent high-precision laboratory analysis.

[0004] The existing automatic water sampler used for water sampling is usually an independent instrument. Because it contains a refrigeration unit, multiple water sample bottles, sample bottles or turntable rotation structure units, it has a complex structure and a large size, and requires secondary development to achieve linkage control with the existing cruise filtration system. Summary of the Invention

[0005] The purpose of the present invention is to develop a mobile automatic sampling, pretreatment and sample retention system with high automation and integration, low maintenance cost and long service life.

[0006] To achieve the above-mentioned object, the present invention discloses a mobile automatic sampling, pretreatment and sample retention system, comprising a first three-way valve, a second three-way valve, a sampling pump, a third three-way valve, a fourth three-way valve, a filtering module, a fifth three-way valve, a sixth three-way valve, and a sampling cup, which are sequentially connected in flow path conduction; The first three-way valve is further connected to the flow paths of the water sample cup and the waste liquid cup; the second three-way valve is further connected to a sampling bottle; The third three-way valve is also connected to a sample bottle; The filter module is composed of at least two parallel filter channels; the fourth three-way valve is connected to the same end of the at least two parallel filter channels respectively; the fifth three-way valve is connected to the other end of the at least two parallel filter channels respectively; the sixth three-way valve is further connected to a backwash cup flow path; The sampling pump is a reversible sampling pump that can rotate forward and reverse, and the extraction direction of the material therein is controlled to switch; the first three-way valve, the second three-way valve, the sampling pump, the third three-way valve, the fourth three-way valve, the fifth three-way valve, and the sixth three-way valve are controlled by a control center to realize switching paths and / or opening and closing paths; Start the sampling pump and sequentially conduct the water sample cup, the first three-way valve, the second three-way valve, the sampling pump, the third three-way valve and the sample bottle to form a sample retention channel; Start the sampling pump and conduct it in sequence along the water sample cup, the first three-way valve, the second three-way valve, the sampling pump, the third three-way valve, the fourth three-way valve, the filter module, the fifth three-way valve, the sixth three-way valve and the sampling cup to form a sampling and pretreatment channel; switch and select one of the at least two parallel filter channels to work; Determine whether the water sample needs to be retained based on the filtrate data of the water sample in the sampling cup. If the water sample needs to be retained, start the sampling pump in reverse to form a sampling channel along the sample bottle, the third three-way valve, the sampling pump, the second three-way valve and the sampling bottle in sequence; if the water sample does not need to be retained, start the sampling pump in reverse to form an emptying channel along the sample bottle, the third three-way valve, the sampling pump, the second three-way valve, the first three-way valve and the waste liquid cup in sequence to empty the water sample in the sample bottle.

[0007] Furthermore, the sampling pump is started in reverse to form a first backwash flow path along the sampling cup, the sixth three-way valve, the fifth three-way valve, the filter module, the fourth three-way valve, the third three-way valve, the sampling pump, the second three-way valve, the first three-way valve, and the waste liquid cup, and each filter channel of the filter module is switched in turn for flushing.

[0008] Furthermore, the sampling pump is started in reverse and flows in sequence along the backwash cup, the sixth three-way valve, the fifth three-way valve, the filter module, the fourth three-way valve, the third three-way valve, the sampling pump, the second three-way valve, the first three-way valve, and the waste liquid cup to form a second backwash flow path, and each filter channel of the filter module is switched in turn to perform the flushing work.

[0009] Furthermore, at least one pressure sensor is provided on the flow path between the third three-way valve and the fourth three-way valve, which is used to measure the pressure of the flowing material and feed back to the control center during the sampling and pretreatment channel process to confirm that when the pressure exceeds the preset value, the control center controls the passage of the fourth three-way valve and the fifth three-way valve and switches to another filtration channel of the filtration module.

[0010] Furthermore, each filtration channel of the filtration module is composed of at least two filter columns connected in series.

[0011] Furthermore, an external analyzer is connected, and the analyzer data is connected to the control center. The analyzer absorbs the water sample in the sampling cup for detection and analysis, and sends the analyzed water sample data to the control center to confirm whether the sampling channel needs to be started.

[0012] Furthermore, an overflow port is provided at the upper end of the sampling cup wall. After the filtered water sample flows out of the overflow port for a preset time, the sampling pump is turned off and the analyzer performs sampling and analysis.

[0013] Furthermore, a liquid level sensor is provided in the sample bottle, and the liquid level sensor is connected to the control center. When the liquid level in the sample bottle reaches the position of the liquid level sensor, the sample passage is closed to ensure that subsequent sampling is quantitative sampling.

[0014] The present invention adopts multi-stage filtration and is equipped with multiple sets of filtration channels, which serve as backup for each other. The system monitors the pressure of the filtration channel in real time. When the pressure exceeds the set threshold, an alarm is issued, and the control center can automatically switch to another backup filtration channel. After the sampling and filtration is completed, the sampling pump is reversed to achieve backwashing of the filter column, which effectively extends the service life of the filter column and reduces the maintenance workload during the cruise test. The entire device is highly automated and integrated, which solves the problems of short filter column service life, improper water sample storage, inconvenient sampling bottle removal, low system automation, high maintenance and high cost in the cruise water sample pretreatment and sample retention device.

[0015] This technical solution is centrally controlled by a central control system to achieve functions such as automatic sampling of seawater, automatic sample retention, filtration and treatment, filtrate collection, linked detection by analyzers, and automatic discharge of filtrate and water samples that do not exceed the standard. It builds an integrated solution covering the entire process of "underway sampling-automatic pretreatment-intelligent sample retention", breaking through the temporal and spatial constraints of marine environmental monitoring and providing reliable technical support for the construction of marine ecological civilization and disaster warning. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The detailed description, given as non-limiting examples, better explains what the invention consists of and how it can be implemented, and furthermore refers to the accompanying drawings, in which: Figure 1 It is a schematic diagram of the connection relationship of the present invention; Figure 2 It is a schematic diagram of the sample retention process of the present invention; Figure 3 It is a schematic diagram of the sampling preprocessing process of the present invention; Figure 4 This is a schematic diagram of the first backwash flow path of the present invention; Figure 5 It is a schematic diagram of the sampling process of the present invention; Figure 6 It is a schematic diagram of the control relationship of the present invention.

[0017] Description of labels: First three-way valve 1; water sample cup 11; waste liquid cup 12; second three-way valve 2; sampling bottle 21; sampling pump 3; third three-way valve 4; sample bottle 41; liquid level sensor 42; fourth three-way valve 5; filtration module 6; filtration channels 61, 62; filter columns 611, 612, 621, 622; fifth three-way valve 7; sixth three-way valve 8; sampling cup 9; overflow port 91; backwash cup 92; control center 10; pressure sensor 20; analyzer 30. DETAILED DESCRIPTION

[0018] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0019] like Figure 1-6 As shown, a walking type automatic sampling, pretreatment and sample retention system includes a first three-way valve 1, a second three-way valve 2, a sampling pump 3, a third three-way valve 4, a fourth three-way valve 5, a filtering module 6, a fifth three-way valve 7, a sixth three-way valve 8 and a sampling cup 9 connected in sequence; The first three-way valve 1 is further connected to the water sample cup 11 and the waste liquid cup 12; the second three-way valve 2 is further connected to a sampling bottle 21; the third three-way valve 4 is further connected to a sample bottle 41; In this embodiment, the filter module 6 is composed of two parallel filter channels 61 and 62. The fourth three-way valve 5 is connected to one end of the two parallel filter channels 61 and 62 respectively; the fifth three-way valve 7 is fluidically connected to the other ends of the two parallel filter channels 61 and 62 respectively; and the sixth three-way valve 8 is fluidically connected to a backwash cup 92. The two parallel filter channels 61 and 62 are respectively composed of at least two filter columns connected in series. As shown in the figure, one filter channel 61 is composed of filter columns 611 and 612 connected in series, and the other filter channel 62 is composed of filter columns 621 and 622 connected in series. In other embodiments, the number of filter columns can be increased or decreased according to actual conditions, and the parallel filter channels 61 and 62 can also be increased according to actual needs.

[0020] A liquid level sensor 42 is provided in the sample bottle 41 and is connected to the control center 10 . When the liquid level in the sample bottle 41 reaches the position of the liquid level sensor 42 , the sample passage is closed to ensure that subsequent sampling is quantitative sampling.

[0021] The sampling pump 3 is a reversible sampling pump 3 that can be reversed in both directions, and the direction of extraction of the material therein is controlled to be switched; Figure 6As shown, the first three-way valve 1, the second three-way valve 2, the sampling pump 3, the third three-way valve 4, the fourth three-way valve 5, the fifth three-way valve 7, and the sixth three-way valve 8 are controlled by a control center 10 to achieve switching paths and / or opening and closing paths; a liquid level sensor 42 is provided in the sample bottle 41, and the liquid level sensor 42 is connected to the control center 10.

[0022] The system proceeds in the following order: 1. Rinse the sample bottle 41: Reversely start the sampling pump 3 and sequentially conduct along the sample bottle 41, the third three-way valve 4, the sampling pump 3, the second three-way valve 2, the first three-way valve 1 and the waste liquid cup 12 to discharge the water sample of the sample bottle 41 into the waste liquid cup 12. After the set time, turn off the sampling pump 3; Control the first three-way valve 1 to switch to the water sample cup 11, start the sampling pump 3 to rotate forward, introduce the water sample from the water sample cup 11 into the sample bottle 41, and stop the sampling pump 3 after the liquid level sensor 42 senses a signal; Switch the first three-way valve 1 to the waste liquid cup 12, start the sampling pump 3 to reverse, and discharge the water sample of the sample bottle 41 to the waste liquid tank. After the set time, turn off the sampling pump 3 to complete the rinsing process of the sample bottle 41.

[0023] 2. Sample bottle 41: like Figure 2 As shown in the direction of the arrow, start the sampling pump 3 and conduct it in sequence along the water sample cup 11, the first three-way valve 1, the second three-way valve 2, the sampling pump 3, the third three-way valve 4 and the sample bottle 41 to form a sample retention channel; start the sampling pump 3 to rotate forward, and introduce the water sample from the water sample cup 11 into the sample bottle 41. After the liquid level sensor 42 senses a signal, stop the sampling pump 3 and complete the sample retention in the sample bottle 41 to ensure that subsequent sampling is quantitative sampling.

[0024] 3. Sampling and preprocessing: like Figure 3 As shown by the arrow direction, the sampling pump 3 is started and flows in sequence along the water sample cup 11, the first three-way valve 1, the second three-way valve 2, the sampling pump 3, the third three-way valve 4, the fourth three-way valve 5, the filter module 6, the fifth three-way valve 7, the sixth three-way valve 8 and the sampling cup 9 to form a sampling and pretreatment channel; the sampling pump 3 is started to rotate forward, and the water sample is filtered through one of the filter channels 61 (filter columns 611, 612) and flows into the sampling cup 9. The upper end of the wall of the sampling cup 9 is provided with an overflow port 91, and the filtered water sample flows out from the overflow port 91. After the set time, the sampling pump 3 is turned off, completing the rinsing of the water sampling pipeline, the collection and pretreatment of the water sample; At least one pressure sensor 20 is provided on the flow path between the third three-way valve 4 and the fourth three-way valve 5, which is used to measure the pressure of the flowing material during the sampling and pretreatment channel and feed back to the control center 10 to confirm that when the pressure exceeds the preset value, the control center 10 controls the passage of the fourth three-way valve 5 and the fifth three-way valve 7 and switches to another filtering channel 62 of the filtering module 6.

[0025] 4. Determine whether the water sample should be retained: An external analyzer 30 is connected to the control center 10. The analyzer 30 is started to absorb the water sample filtrate in the sampling cup 9 for detection and analysis, and the analyzed water sample data is sent to the control center 10. The control center 10 determines whether it is necessary to retain the water sample based on the water sample data in the sampling cup 9. If it is necessary to retain the water sample, the sampling pump 3 is started in reverse to complete the sampling of the sampling bottle 21 along the sampling channel formed by the sample bottle 41, the third three-way valve 4, the sampling pump 3, the second three-way valve 2 and the sampling bottle 21. Figure 5 As shown by the arrow, the sampling bottle 21 can be taken to a laboratory or a third-party testing agency for retesting; When the water sample value is lower than the exceeding standard threshold, there is no need to retain the sample, and the sampling pump 3 is started in reverse, and the water sample of the sample bottle 41 is discharged to the waste liquid cup 12 along the sample bottle 41, the third three-way valve 4, the sampling pump 3, the second three-way valve 2, the first three-way valve 1 and the waste liquid cup 12. After the set time, the sampling pump 3 is turned off to complete the emptying of the water sample in the sample bottle 41.

[0026] 5. Backwash of filter module 6: like Figure 4 As shown by the direction of the arrow, the sampling pump 3 is started in reverse and flows in sequence along the sampling cup 9, the sixth three-way valve 8, the fifth three-way valve 7, the filter module 6, the fourth three-way valve 5, the third three-way valve 4, the sampling pump 3, the second three-way valve 2, the first three-way valve 1, and the waste liquid cup 12 to form a first backwash flow path, and the remaining filtrate in the sampling cup 9 is back-drawn. At least each filter channel of the filter module 6 is switched in sequence for backwashing, and the backwashed wastewater is discharged to the waste liquid cup 12, which will not contaminate the water sample to be drawn.

[0027] At the same time, in order to ensure the backwash effect of filter columns 611, 612, 621, and 622, after the remaining filtrate in the sampling cup 9 is backwashed, the sixth three-way valve 8 is started to switch to the backwash cup 92 channel, and the sampling pump 3 is started in reverse to form a second backwash flow path along the backwash cup 92, the sixth three-way valve 8, the fifth three-way valve 7, the filter module 6, the fourth three-way valve 5, the third three-way valve 4, the sampling pump 3, the second three-way valve 2, the first three-way valve 1, and the waste liquid cup 12. The backwash water in the backwash cup 92 is used to further backwash each filter channel in the filter module 6, and each filter channel is switched in turn for flushing to extend the life of the filter column.

[0028] The above embodiments and illustrations do not limit the product form and style of the present invention. Any appropriate changes and modifications made by ordinary technicians in the relevant technical field should be deemed to be within the patent scope of the present invention.

Claims

1. A cruise-type automatic sampling, pretreatment and sample retention system, characterized in that: It includes a first three-way valve, a second three-way valve, a sampling pump, a third three-way valve, a fourth three-way valve, a filter module, a fifth three-way valve, a sixth three-way valve, and a sampling cup, which are sequentially connected in flow path conduction; The first three-way valve is further connected to the flow paths of the water sample cup and the waste liquid cup; the second three-way valve is further connected to a sampling bottle; The third three-way valve is also connected to a sample bottle; The filter module is composed of at least two parallel filter channels; the fourth three-way valve is connected to the same end of the at least two parallel filter channels respectively; the fifth three-way valve is connected to the other end of the at least two parallel filter channels respectively; the sixth three-way valve is further connected to a backwash cup flow path; The sampling pump is a reversible sampling pump that can rotate forward and reverse, and the extraction direction of the material therein is controlled to switch; the first three-way valve, the second three-way valve, the sampling pump, the third three-way valve, the fourth three-way valve, the fifth three-way valve, and the sixth three-way valve are controlled by a control center to realize switching paths and / or opening and closing paths; Start the sampling pump and sequentially conduct the water sample cup, the first three-way valve, the second three-way valve, the sampling pump, the third three-way valve and the sample bottle to form a sample retention channel; Start the sampling pump and conduct it in sequence along the water sample cup, the first three-way valve, the second three-way valve, the sampling pump, the third three-way valve, the fourth three-way valve, the filter module, the fifth three-way valve, the sixth three-way valve and the sampling cup to form a sampling and pretreatment channel; Switch and select one of at least two parallel filtering channels to work; Determine whether the water sample needs to be retained based on the water sample filtrate data in the sampling cup. If the water sample needs to be retained, start the sampling pump in reverse to form a sampling channel along the sample bottle, the third three-way valve, the sampling pump, the second three-way valve and the sampling bottle.

2. The mobile automatic sampling, pretreatment and sample retention system according to claim 1, characterized in that: Determine whether the water sample needs to be retained based on the filtrate data of the water sample in the sampling cup. If the water sample does not need to be retained, reverse and start the sampling pump to form an emptying channel along the sample bottle, the third three-way valve, the sampling pump, the second three-way valve, the first three-way valve and the waste liquid cup in sequence to empty the water sample in the sample bottle.

3. The mobile automatic sampling, pretreatment and sample retention system according to claim 1, characterized in that: Start the sampling pump in reverse to form the first backwash flow path along the sampling cup, the sixth three-way valve, the fifth three-way valve, the filter module, the fourth three-way valve, the third three-way valve, the sampling pump, the second three-way valve, the first three-way valve, and the waste liquid cup, and switch each filter channel of the filter module in turn to perform the flushing work.

4. A mobile automatic sampling, pretreatment and sample retention system according to claim 3, characterized in that: Start the sampling pump in reverse to form a second backwash flow path along the backwash cup, the sixth three-way valve, the fifth three-way valve, the filter module, the fourth three-way valve, the third three-way valve, the sampling pump, the second three-way valve, the first three-way valve, and the waste liquid cup, and switch each filter channel of the filter module in turn to perform the flushing work.

5. The mobile automatic sampling, pretreatment and sample retention system according to claim 1, characterized in that: At least one pressure sensor is provided on the flow path between the third three-way valve and the fourth three-way valve, which is used to measure the pressure of the flowing material and feed back to the control center during the sampling and pretreatment channel process. When it is confirmed that the pressure exceeds the preset value, the control center controls the passage of the fourth three-way valve and the fifth three-way valve and switches to another filtration channel of the filtration module.

6. The mobile automatic sampling, pretreatment and sample retention system according to claim 1, characterized in that: Each filter channel of the filter module is composed of at least two filter columns connected in series.

7. The mobile automatic sampling, pretreatment and sample retention system according to claim 1, characterized in that: An external analyzer is connected to the control center. The analyzer absorbs the water sample in the sampling cup for detection and analysis, and sends the analyzed water sample data to the control center to confirm whether the sampling channel needs to be started.

8. The mobile automatic sampling, pretreatment and sample retention system according to claim 7, characterized in that: An overflow port is provided at the upper end of the sampling cup wall. After the filtered water sample flows out of the overflow port for a preset time, the sampling pump is turned off and the analyzer performs sampling and analysis.

9. The mobile automatic sampling, pretreatment and sample retention system according to claim 1, characterized in that: A liquid level sensor is provided in the sample bottle and is connected to a control center. When the liquid level in the sample bottle reaches the position of the liquid level sensor, the sample passage is closed to ensure that subsequent sampling is quantitative sampling.

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