WO2022021594A1

WO2022021594A1 - Automatic sampling device

Info

Publication number: WO2022021594A1
Application number: PCT/CN2020/118395
Authority: WO
Inventors: 邹雄伟; 蔡志; 李智; 凌清; 赵行文
Original assignee: 力合科技（湖南）股份有限公司
Priority date: 2020-07-31
Filing date: 2020-09-28
Publication date: 2022-02-03
Also published as: CN114088465A

Abstract

An automatic sampling device, comprising a sampling container and a flow passage channel in communication with the sampling container; the sampling container has at least two regions having different average densities, so that when the sampling device is placed at a sampling point in a sample liquid, a part of the flow passage channel is located below a liquid level, and there is a pressure difference between the inner cavity of the sampling container and the liquid level, so that the sample liquid enters the sampling container from the part of the flow passage channel under the effect of the pressure difference. When the sampling container is placed at a liquid sampling point, a liquid to be collected is automatically collected into the sampling container from a part of the flow passage channel; when the pressure difference between the inner cavity of the sampling container and the liquid level is zero, or when the attitude of the sampling container changes during a sampling process so that the flow passage channel of the sampling container is completely changed to be above the liquid level, sampling is automatically stopped; thus, sampling can be automatically performed and sampling can be automatically stopped, without a manual sampling operation; moreover, the structure is simple, and the manufacturing cost is low.

Description

Automatic sampling device

technical field

The present invention relates to the technical field of environmental monitoring, in particular, to an automatic sampling device.

Background technique

In recent years, with the continuous development of my country's social economy and the expansion of the scale of cities, more toxic and harmful substances have been unscrupulously discharged into rivers, lakes and oceans, seriously endangering people's lives, drinking water safety and their own health. At present, the sampling method of environmental supervision departments is basically manual sampling, which has problems such as limited sampling frequency, large investment in human and material resources, greater safety hazards, and long sampling period.

At present, water quality sampling and monitoring mainly adopts manual sampling, and a small number of water quality automatic samplers installed on site for automatic sample retention. The manual sampling method is suitable for sampling requirements with low frequency (such as once a month/week), or requirements with high frequency but short sampling distance (such as sampling in the factory area), but the manual sampling method is difficult to capture the sampling timing. , It is difficult to control the sampling quality, the personnel input is large, and there are many disadvantages such as potential safety hazards. The water quality automatic sampler can be applied to high-frequency sampling requirements, and can achieve isochronous, equal, equal time, equal flow rate, and external conditions change to a critical point to trigger sampling. Compared with manual sampling, it has many advantages, but it also has many advantages. There are disadvantages such as high requirements for on-site installation and use conditions, requiring an external power supply, high cost, large investment, large volume, long construction period, and inconvenient layout.

Therefore, there is an urgent need for a sampling device that can realize automatic sampling without external power, get rid of the constraints of sampling power sources, greatly improve the flexibility and diversity of sampling methods, reduce sampling investment, and effectively reduce its volume. The flexibility of the sampling device is improved, which can meet the requirements of watershed sampling in the wild or dangerous areas, eliminate hidden safety hazards in the sampling process, and is suitable for water sampling in various complex environments.

SUMMARY OF THE INVENTION

The invention provides an automatic sampling device to solve the technical problem of manual sampling operation and difficult operation in the existing environmental monitoring, without the need to provide power. The formed pressure difference realizes the automatic injection of the sample liquid. It is suitable for water sampling in various complex water environments, with high flexibility and adaptability.

According to one aspect of the present invention, an automatic sampling device is provided, comprising a sampling container and a flow passage communicating with the sampling container; the sampling container has at least two regions with different average densities, so that the sampling device is placed after the sample liquid sampling point , part of the overflow channel is located below the liquid surface, and there is a pressure difference between the inner cavity of the sampling container and the liquid surface, so that the sample liquid enters the sampling container from part of the overflow channel under the action of the pressure difference.

Further, the overflow channel includes a sampling channel and an exhaust channel, the sampling channel is located in the area with the largest average density of the sampling container, and the exhaust channel is located in the area with the smallest average density of the sampling container, so that the sampling container is put into the sample liquid sampling. After the point, some or all of the injection channel is below the liquid level.

Further, multiple regions with different average densities are formed by processing the material and/or shape of the sampling container itself; or multiple regions with different average densities are formed by arranging a weight structure in and/or outside the sampling container; or A plurality of regions with different average densities are formed by arranging the air flotation structure in the sampling container and/or outside the sampling container.

Further, the average density of the entire sampling container is not greater than the density of the sample liquid to be collected.

Further, the sampling container is provided with a control module for controlling sampling, a power supply module for supplying power to the control module, and a communication module for receiving and transmitting signals, and the control module is electrically connected with the communication module.

Further, the exhaust passage is provided with an exhaust valve connected with the control module.

Further, the sampling channel is provided with a sampling valve connected with the control module.

Further, a pressure sensor, a positioning module, a temperature sensor, a conductivity sensor, a gyroscope sensor, a pH sensor, an ORP sensor, a dissolved oxygen sensor, a turbidity sensor, a sound pickup, and a video acquisition device connected to the control module are also installed in the sampling container. at least one of the.

Further, the communication module is located on the sampling container in an area above or near the liquid level where signals can be transmitted after sampling.

Further, the sampling container includes a plurality of units; the plurality of units are of separate structures, which are sealed and connected to each other; or the plurality of units have an integral structure.

The present invention has the following beneficial effects:

The automatic sampling device of the present invention forms a plurality of regions with different average densities in the sampling container, so that after the sampling container is put into the liquid sampling point, there is a pressure difference between the inner cavity of the sampling container and the liquid surface, and part of the flow passages It is located below the liquid level, so that the liquid to be collected is automatically collected from part of the overflow channel into the sampling container. When the pressure difference between the inner cavity of the sampling container and the liquid surface is zero, or when the attitude of the sampling container changes during the sampling process. When all the overflow channels of the sampling container are changed to above the liquid level, the sampling is automatically stopped, so the sampling can be automatically injected and automatically stopped without manual sampling operation, and the structure is simple and the manufacturing cost is low.

In addition to the objects, features and advantages described above, the present invention has other objects, features and advantages. The present invention will be described in further detail below with reference to the drawings.

Description of drawings

The accompanying drawings constituting a part of the present application are used to provide further understanding of the present invention, and the exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the attached image:

1 is a schematic structural diagram of an automatic sampling device according to a preferred embodiment of the present invention;

Fig. 2 is the structural schematic diagram of the use state of the automatic sampling device of the preferred embodiment of the present invention;

3 is a schematic structural diagram of an automatic sampling device according to another embodiment of the present invention;

4 is a schematic structural diagram of an automatic sampling device according to another embodiment of the present invention;

5 is a schematic structural diagram of an automatic sampling device according to another embodiment of the present invention;

FIG. 6 is a schematic structural diagram of an automatic sampling device according to another embodiment of the present invention.

illustration:

1. Bottle body; 2. Bottle cap; 3. Injection channel; 4. Exhaust channel; 5. Counterweight; 6. Control module; 7. Power module; 8. Injection valve; 9. Exhaust valve; 10. Conductivity sensor; 11. Pressure sensor; 12. Temperature sensor; 13. Floating body; 14. Air flotation cabin.

detailed description

The embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention can be implemented in many different ways as defined and covered below.

1 is a schematic structural diagram of an automatic sampling device of a preferred embodiment of the present invention; FIG. 2 is a structural schematic diagram of an automatic sampling device of a preferred embodiment of the present invention in use state; FIG. 3 is a structural schematic diagram of an automatic sampling device of another embodiment of the present invention Fig. 4 is the structural representation of the automatic sampling device of another embodiment of the present invention; Fig. 5 is the structural representation of the automatic sampling device of another embodiment of the present invention; Fig. 6 is the structure of the automatic sampling device of another embodiment of the present invention Schematic.

As shown in FIG. 1 , the automatic sampling device of this embodiment includes a sampling container and a flow passage communicating with the sampling container. The sampling container has at least two areas with different average densities, so that the sampling device is placed after the sample liquid sampling point. , part of the overflow channel is located below the liquid surface, and there is a pressure difference between the inner cavity of the sampling container and the liquid surface, so that the sample liquid can smoothly enter the sampling container from the partial overflow channel under the action of the pressure difference. Therefore, through the two areas with different densities of the sampling device, the sampling container is put on the sampling liquid surface, and the liquid enters the sampling container through the contact part of the flow channel and the liquid surface under the action of the pressure difference, so as to complete the sampling automatic sampling.

Taking the sampling of surface water as an example, after the sampling device provided by the present invention is placed on the water surface, since the sampling device has at least two areas with different densities, and the overflow channel is located in the area where the average density is greater than the density of the sample liquid to be collected, the gravity Under the action, the area of the over-flow channel must first contact the water surface, and then part of the water is emptied. At this time, there is a height difference between the inner cavity of the sampling container connected to the over-flow channel and the liquid level of the sampling point, resulting in a pressure difference. , the water can smoothly enter the sampling container under the action of the pressure difference, so as to complete the automatic sampling of surface water.

In a preferred embodiment of the present invention, as shown in FIG. 1 , the overflow channel includes a sampling channel 3 and an exhaust channel 4 , the sampling container has a plurality of regions with different average densities, and the sampling channel 3 is located at a position where the average density is greater than In the density area of the liquid to be sampled, after the sampling container is put into the liquid sampling point, part and/or all of the sampling channel 3 is below the liquid level, and there is a pressure difference between the inner cavity of the sampling container and the liquid level, so that the The collected liquid is automatically collected from the sampling channel 3 into the sampling container.

According to the automatic sampling device of the embodiment of the present invention, the sampling container is formed into a plurality of regions with different average densities, and the sampling channel 3 is arranged in the region with the highest average density of the sampling container, and the exhaust channel is arranged in the region with the smallest average density. 4. After the sampling container is put into the liquid sampling point, part and/or all of the sampling channel 3 is located below the liquid level, and there is a pressure difference between the inner cavity of the sampling container and the liquid surface, so that the liquid to be collected is automatically removed from the sampling channel. 3. Collected into the sampling container, when the pressure difference between the sampling container and the liquid to be sampled is zero, the sampling will be automatically stopped, so it can automatically inject and stop sampling without manual sampling operation, and the structure is simple and the manufacturing cost Low.

As shown in Fig. 1 and Fig. 2, in this embodiment, the collection container has at least two regions with different average densities, and the sampling channel 3 is located in the region of the sampling container with the highest average density. After the sampling container is placed at the liquid sampling site, after the area near the sampling channel 3 contacts the liquid surface, the liquid to be collected is evacuated, so that part or all of the sampling channel 3 is below the liquid level, and the exhaust channel 4 communicates with the outside world. , there is a height difference between the sampling container and the liquid level, and then a pressure difference is generated, so that the liquid to be collected is automatically collected from the sampling channel 3 to the sampling container, and the gas in the sampling container is discharged from the exhaust channel 4 to the outside world. As the liquid sample gradually enters the sampling container, the weight of the sampling container changes, so that the overall average density distribution of the sampling container changes, so the attitude of the sampling container also changes. When the sampling channel 3 of the sampling container changes to above the liquid level is automatically stopped sampling. After the sampling is completed, the exhaust channel 4 is not lower than the liquid level in the sampling container. Further, the overall average density of the collection container is not greater than the density of the collected sample solution. Therefore, the sampling container after sampling is still floating on the liquid surface.

According to the requirements of the sampling volume of liquid samples, the average density of different areas of the sampling container is designed to make the automatic sampling volume of the sampling container meet the requirements. For example, the average density of the area near the injection channel 3 is designed to be not less than the density of the sample liquid to be tested, and the average density of the area near the exhaust channel 4 is not greater than the density of the sample liquid to be tested. Or, the average density of the area near the sampling channel 3 is smaller than the density of the sample liquid to be tested, but with the structural design connected to it, after the sampling container is placed on the sampling liquid level, the inner cavity of the sampling container and the liquid surface are separated. If there is a pressure difference, after the area near the sampling channel 3 contacts the liquid level, the liquid to be collected is partially emptied, so that part or all of the sampling channel 3 is below the liquid level, and it can ensure that the sample liquid can smoothly enter the sampling under the pressure difference. inside the container. For example, the average density of the sample injection channel 3 area is less than the density of the sample liquid to be tested, and there is a pressure-providing structure or component outside this area. Partial evacuation of the sampled liquid results in a pressure differential between the inner cavity of the sampling container and the liquid surface.

Therefore, there is no clear size definition between the average density of the area near the sampling channel 3 and/or the exhaust channel 4 and the density of the sample liquid to be collected. In the specific implementation process, it can be realized with flexible structures, such as , Process the area where the average density of the sampling channel 3 is less than the density of the sample liquid to be collected, and process it into a wedge shape or a cone. The sampling point where the sampling container is placed, after maintaining the balance, make some or all of the sampling channel 3 below the liquid level.

The above description is described only by citing several preferred embodiments of the present invention, but for those skilled in the art, on the basis of the above disclosure, the density of the sampling channel 3 area and the density to be collected can be The relationship between the sample liquids can also be designed with other similar structures different from this. For example, by attaching an external auxiliary structure to the sampling container to provide power to the sampling container, so that when the sampling container is in a balanced position, it is sufficient to ensure that part or all of the sampling channel 3 is below the liquid level. This can be adjusted appropriately according to the specific situation. The specific fixed positional relationship or other structural shapes that achieve the same function should be easily conceived by those skilled in the art, so they will not be repeated here.

A necessary explanation about the average density of the sampling container: in the cavity state, the average density of the entire sampling container is the ratio of the mass of the sampling container to the volume of the sampling container; in the sampling state, the average density is the sampling container and the sample collected inside. The ratio of the sum of the mass of the liquid to the volume of the sampling container itself. Preferably, the average density of the entire sampling container is not greater than the density of the sample liquid to be collected. Therefore, it can be ensured that the entire sampling container can float on the surface of the liquid to be sampled during and after the sampling process.

In addition, the exhaust channel 4 may be a ventilating hole with the outside, and/or a pipe communicating with the sampling container, as long as the air flow in the sampling container can be smoothly diverted.

In addition, the sampling channel 3 can also be a pipeline connected to the sampling container, thereby facilitating the collection of the sample liquid below the liquid level of the sample liquid to be measured, for example, the sample liquid at a fixed depth below the liquid level of the sample liquid to be collected liquid.

Furthermore, the sampling container may be a plurality of conjoined cavities, and/or a plurality of cavities independent of each other. Therefore, by controlling the valve, it can be realized that a sampling device can take sampling at multiple sampling points; or a controller can realize sampling at the same sampling point, and/or multiple sampling points in different time periods.

Optionally, the overall average density of the collection container prior to sampling is less than the density of the liquid sample. After the sampling container is placed at the liquid sampling site, the sampling channel 3 is located in the area with the highest average density of the sampling container. , the gas in the sampling container is discharged from the exhaust channel 4 to the outside. Optionally, the exhaust channel 4 also sinks below the liquid level. Optionally, the exhaust channel 4 does not sink below the liquid level. When the liquid level in the collection container is the same as the liquid level at the liquid collection site, the sampling will stop automatically. As the liquid sample gradually enters the sampling container, the overall density distribution of the sampling container changes, so the posture of the sampling container also changes. When the sampling channel 3 of the sampling container changes to above the liquid level, the sampling is automatically stopped. The overall average density of the sampling container after sampling is completed is still less than the density of the liquid sample, so the sampling container after sampling is still floating on the liquid surface. The automatic sampling volume of the sampling container is equal to the drainage volume of the sampling container. According to the requirements of the sampling volume of the liquid sample, the average density of different areas of the sampling container is designed to make the automatic sampling volume of the sampling container meet the requirements.

Optionally, the overall mean density of the collection container prior to sampling is equal to the density of the liquid sample. After the sampling container is placed at the liquid sampling site, the sampling channel 3 is located in the area with the highest average density of the sampling container. , the gas in the sampling container is discharged to the outside through the exhaust channel 4, and when the sampling container is filled with the liquid sample bottle, the sampling is automatically stopped. The collection container is suspended below the liquid surface after collection. Optionally, if the overall average density of the collection container before sampling is greater than the density of the liquid sample, the collection container sinks below the liquid surface after collection. The automatic sampling volume of the sampling container is equal to the total volume of the sampling container. According to the requirements of the sampling volume of the liquid sample, the overall average density of the sampling container and the total volume of the sampling container are designed to make the automatic sampling volume of the sampling container meet the requirements.

Optionally, a plurality of regions with different average densities are formed by the manufacturing material and/or shape processing of the sampling container itself. Optionally, a plurality of regions with different average densities are formed by arranging a counterweight structure in the sampling container and/or outside the sampling container. Optionally, a plurality of regions with different average densities are formed by arranging an air flotation structure inside and/or outside the sampling container. In this embodiment, by adding a counterweight 5 in the sampling container, the sampling channel 3 is set near the counterweight 5, so that the sampling channel 3 is located in the area where the average density of the sampling container is the highest.

The sampling container includes a plurality of units, and the sampling channel 3 and the exhaust channel 4 are arranged on one of the units. Optionally, the plurality of units are of separate structures and are connected to each other in a sealed manner. Optionally, the plurality of units are integrated into a single unitary structure.

As shown in FIG. 1 and FIG. 2 , in this embodiment, the sampling container includes two units, a bottle body 1 and a bottle cap 2 , and the sampling channel 3 and the exhaust channel 4 are provided on the bottle cap 2 . The area where the sampling channel 3 is located is the area with the highest average density on the sampling container. The area where the sampling channel 3 is located is placed in the water by putting the sampling container into the water. The sampling channel 3 is located below the water surface, and the exhaust channel 4 is located above the water surface. The sample is automatically collected into the bottle body 1, and the density distribution of the sampling container is gradually changed through the gradual increase of water samples in the bottle body 1, so that the attitude of the sampling container changes. When the sampling channel 3 changes to above the water surface , the sampling container automatically stops sampling, thereby completing the automatic quantitative sampling of water samples. Optionally, the bottle body 1 is provided with a bottle mouth, and the bottle cap 2 is sealed on the bottle mouth.

Optionally, an anti-counterfeiting detection device for detecting whether the bottle cap 2 and the bottle mouth have been opened is installed between the bottle cap 2 and the bottle mouth. Optionally, the anti-counterfeiting detection device includes at least one of a piezoelectric sensor, an electromagnetic sensor, a contact switch and a probe. When a piezoelectric sensor is used, the piezoelectric sensor is arranged between the bottle cap 2 and the bottle body 1. When the bottle cap 2 is twisted, the piezoelectric sensor can detect the pressure change and feed it back to the control module 6. The control module 6 is the It can record the twisting event or generate alarm information and transmit it to the remote management platform to remind the staff that the water sample may be tampered with. When an electromagnetic sensor is used, the electromagnetic sensor is arranged between the bottle cap 2 and the bottle body 1. When the bottle cap 2 is twisted, the magnetic field will change, and the electromagnetic sensor will generate a feedback electrical signal and transmit it to the control module 6. The control module 6 You can record the twisting event or generate alarm information and transmit it to the remote management platform. When a contact switch is used, one contact is set on the bottle cap 2, and the other contact is set on the bottle body 1. When the bottle cap 2 is tightened, the two contacts just touch, and the circuit is turned on. When being twisted, the two contacts are staggered and the circuit is disconnected. The control module 6 can monitor that the circuit is in a disconnected state, and can determine that the bottle cap 2 is twisted, and the control module 6 records the twisting event or generates an alarm. The information is transmitted to the remote management platform. When using probes, one of the probes is set on the bottle cap 2, and the other probe is set on the bottle body 1. When the bottle cap 2 is tightened, the two probes just touch, and the circuit is turned on. When the bottle cap 2 is twisted, the two probes are staggered and the circuit is disconnected. The control module 6 can monitor that the circuit is in a disconnected state, and can determine that the bottle cap 2 is twisted, and the control module 6 records the twisting event. Or generate alarm information and transmit it to the remote management platform. In addition, as an option, anti-counterfeiting labels are also provided on the sampling containers, and each sampling container corresponds to a unique anti-counterfeiting label. The comparison is performed to verify the authenticity of the sampling container to prevent the entire sampling container from being exchanged during transportation, which further improves the anti-counterfeiting performance of the water sample. Wherein, the anti-counterfeiting label may be at least one of two-dimensional code, barcode and RFID.

As shown in Figure 3, Figure 4, Figure 5 and Figure 6, the sampling container is equipped with a control module 6 for controlling sampling, a power supply module 7 for supplying power to the control module 6, and a communication module for receiving and transmitting signals. The module is located in an area capable of receiving and transmitting signals, and the control module 6 is electrically connected with the communication module. The communication module is located on the sampling container and is located in the area above or near the liquid surface that can transmit signals after sampling. In this embodiment, after the sampling is completed, the communication module is above the liquid level or not less than 25 cm below the liquid level, so as to transmit the sampling signal to the remote management platform. Optionally, the communication module includes 3G/4G/5G module, NB-IOT module, eMTC module, LoRa module or Sigfox module, so that the detection parameters can be remotely transmitted to the remote management platform in real time; module, Wi-fi module or Zigbee module, the staff can bring the management terminal to the site and establish a wireless connection with the communication module, so as to wirelessly read the monitoring data stored in the control module 6 . In addition, in other embodiments of the present invention, the communication module may be omitted, and after the sampling container is picked up from the water environment, the monitoring data in the control module 6 can be directly read by the management terminal through the interface.

Optionally, an identification module is also installed on the sampling container. Optionally, the identification module is identified by special text patterns and/or symbols. Optionally, the identification module is identified by illumination. Optionally, the recognition module performs recognition through ringtones or voice broadcasts.

Optionally, the sampling channel 3 is provided with a sampling valve 8 connected to the control module 6 . The control module 6 determines whether the automatic sampling device starts sampling, so as to control the sampling valve 8 to open, and then start automatic sampling. Optionally, the exhaust passage 4 is provided with an exhaust valve 9 connected to the control module 6 . After the sampling is completed, the control module 6 controls the exhaust valve 9 to close to prevent foreign impurities from entering the sampling container from the exhaust channel 4 . Optionally, the sampling valve and the sampling valve 8 are both solenoid valves. Optionally, a filter device is installed at the injection port of the injection channel 3 to filter out large particle impurities in the liquid sample.

As shown in Fig. 3, Fig. 4, Fig. 5 and Fig. 6, a pressure sensor 11, a positioning module, a temperature sensor 12, a conductivity sensor 10, a gyroscope sensor, a pH sensor, At least one of an ORP sensor, a dissolved oxygen sensor, a turbidity sensor, a pickup, and a video capture device. The control module 6 is also used to control the sampling state according to the detection result of the pressure sensor 11 or the liquid level sensor to realize automatic quantitative sampling. The pressure detection result of the pressure sensor 11 and the liquid level detection result of the liquid level sensor can be correspondingly converted into the sampling volume, and the pressure sensor 11 or the liquid level sensor is used to monitor the sampling volume in the sampling container in real time and transmit the detection result to the control module 6 , the control module 6 controls the sampling state according to the detection result, so as to realize automatic quantitative sampling.

Preferably, a positioning module electrically connected to the control module 6 is also installed on the sampling container, and the control module 6 is further configured to obtain the position information of the sampling container through the positioning module. The positioning module may be any one of a GPS positioning module, a Beidou positioning module, and a Galileo positioning module. The location of the sampling container can be obtained in real time through the positioning module, and the real-time location can be stored in association with the monitoring data or transmitted to the remote management platform together, which improves the authenticity of the sampling and facilitates the recovery of the sampling container. In the subsequent water sample transportation process The water sample can also be positioned and supervised throughout the process to prevent tampering with the water sample during transportation, further improving the anti-counterfeiting performance of the water sample.

Preferably, the sampling container is also provided with a gyroscope sensor that is electrically connected to the control module 6 and used to detect the attitude of the sampling container. The control module 6 is also used to detect that the current attitude of the sampling container does not conform to the preset attitude when the gyro sensor detects that the current attitude of the sampling container does not conform to the preset attitude. When it is in range, it records abnormal posture events or generates alarm information and transmits it to the remote management platform. The control module 6 is preset with a preset attitude range for the sampling container to be put into the water environment. Only when the attitude of the sampling container is within the preset attitude range can smooth sampling be ensured. The current attitude of the sampling container is detected by the gyroscope sensor and will be detected. The result is transmitted to the control module 6. Once the control module 6 compares that the current posture of the sampling container does not meet the preset posture range, it means that the current posture of the sampling container does not meet the requirements, and the sample may not be injected normally. Above the liquid level, while the exhaust channel 4 is located below the liquid level, the control module 6 generates alarm information and transmits it to the remote management platform through the communication module, timely reminding the staff to adjust the posture of the sampling container manually, or the control module 6 Record the abnormal posture events, and remind the staff to overhaul the structure of the sampling container.

As shown in FIG. 3 and FIG. 4 , in this embodiment, the sample injection channel 3 and the exhaust channel 4 are arranged on the bottle cap 2 , and the control module 6 , the power supply module 7 and other functional modules are installed in the bottle cap 2 , And by biasing the installation of the control module 6, the power module 7 and/or other functional modules to the area where the sampling channel 3 is located, the area where the sampling channel 3 is located is the area with the highest average density on the sampling container, while the exhaust channel is located. The area of 4 is the area with the smallest average density on the sampling container. After the sampling container is placed at the liquid sampling site, the sampling channel 3 is located below the liquid level, and the exhaust channel 4 is located above the liquid surface. Therefore, there is a pressure difference between the sampling channel 3 and the exhaust channel 4, so that the liquid to be collected is automatically removed from the liquid. The sampling channel 3 is collected into the bottle body 1, and the gas in the sampling container is discharged from the exhaust channel 4 to the outside world. As the liquid sample gradually enters the sampling container, the overall density distribution of the sampling container changes. Therefore, the attitude of the sampling container It also changes. When the sampling channel 3 on the bottle cap 2 changes to above the liquid level, the sampling will be stopped automatically. Optionally, the control module 6 controls the exhaust valve 9 to close, so that the sampling container stops sampling. Optionally, the control module 6 controls the sampling valve 8 to close, so that the sampling container stops sampling.

As shown in FIG. 5 and FIG. 6 , optionally, the bottle cap 2 is closed on the top of the bottle body 1 , the exhaust channel 4 is arranged on the bottle cap 2 , and the sample injection channel 3 is arranged at the bottom of the bottle body 1 . By adding a floating body 13 and/or an air flotation chamber 14 on the top of the bottle body 1 and/or in the bottle cap 2, the area where the exhaust channel 4 is located is the area with the smallest average density on the sampling container. After the sampling container is placed at the liquid sampling site, the sampling channel 3 is located below the liquid level, and the exhaust channel 4 is located above the liquid surface. Therefore, there is a pressure difference between the sampling channel 3 and the exhaust channel 4, so that the liquid to be collected is automatically removed from the liquid. The sampling channel 3 is collected into the bottle body 1, and the gas in the sampling container is discharged from the exhaust channel 4 to the outside world. As the liquid sample gradually enters the sampling container, when the liquid level in the bottle body 1 and the outside When the liquid level is flush, sampling will stop automatically. Optionally, the control module 6 controls the exhaust valve 9 to close, so that the sampling container stops sampling. Optionally, the control module 6 controls the sampling valve 8 to close, so that the sampling container stops sampling.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

An automatic sampling device, characterized in that:

comprising a sampling container and a flow passage communicating with the sampling container;

The sampling container has at least two areas with different average densities, so that after the sampling device is put into the sample liquid sampling point, part of the flow channel is located below the liquid level, and there is a pressure difference between the inner cavity of the sampling container and the liquid level , so that the sample liquid enters the sampling container from part of the overflow channel under the action of the pressure difference.
The automatic sampling device according to claim 1, wherein:

The flow channel includes a sample injection channel (3) and an exhaust channel (4),

The sampling channel (3) is located in the area where the average density of the sampling container is the largest, and the exhaust channel (4) is located in the area where the average density of the sampling container is the smallest, so that the sampling container is put into the sample liquid sampling point Afterwards, part or all of the injection channel (3) is located below the liquid surface.
The automatic sampling device according to claim 1, wherein:

Multiple regions of different average densities are formed by the material and/or shape of the sampling container itself; or

A plurality of regions with different average densities are formed by arranging a weighted structure inside the sampling container and/or outside the sampling container; or

A plurality of regions with different average densities are formed by arranging an air flotation structure in the sampling container and/or outside the sampling container.
The automatic sampling device according to claim 2, wherein,

The overall average density of the sampling container is not greater than the density of the sample liquid to be collected.
The automatic sampling device according to claim 2, wherein,

The sampling container is provided with a control module (6) for controlling sampling, a power supply module (7) for supplying power to the control module (6), a communication module for receiving and transmitting signals, and the control module (6) ) is electrically connected with the communication module.
The automatic sampling device according to claim 5, wherein,

The exhaust passage (4) is provided with an exhaust valve (9) connected with the control module (6).
The automatic sampling device according to claim 5, wherein,

The sampling channel (3) is provided with a sampling valve (8) connected with the control module (6).
The automatic sampling device according to claim 5, wherein,

A pressure sensor (12), a positioning module, a temperature sensor (11), a conductivity sensor (10), a gyroscope sensor, a pH sensor, an ORP sensor, At least one of a dissolved oxygen sensor, a turbidity sensor, a sound pickup, and a video capture device.
The automatic sampling device according to claim 5, wherein,

The communication module is located on the sampling container and is located in an area above or near the liquid level where signals can be transmitted after sampling.
The automatic sampling device according to claim 1, wherein:

The sampling container includes a plurality of units; the plurality of units are of separate structures, and are connected to each other in a sealed manner; or the plurality of units have an integral structure.