A sampling device for water quality detection and its sampling method

Abstract

The present invention discloses a sampling device for water quality detection and a sampling method thereof. The sampling device for water quality detection comprises a sampling device body, wherein a water immersion chamber is provided inside the sampling device body, a baffle is fixedly connected to the top of the water immersion chamber, a floating device is assembled on the side end surface of the sampling device body, a pressure plate is slidably connected inside the water immersion chamber, a first air bag is fixedly connected to one end of the pressure plate away from the baffle, a sealing cavity is fixedly connected to one end of the first air bag away from the pressure plate, a sampling chamber is provided at the bottom of the water immersion chamber, a sampling port is connected to the sampling chamber, a liquid inlet manifold is embedded in the inner wall of the water immersion chamber, and the present invention is convenient to use and operate, and can realize rapid sampling of samples of water bodies at different depths.

Description

Technical Field

[0001] The present invention relates to the technical field of sampling devices, and particularly relates to a sampling device for water quality detection and a sampling method thereof. Background Art

[0002] Water is the source of life. Humans are inseparable from water in their life and production activities. The quality of domestic drinking water is closely related to human health. With the development of social economy, scientific progress, and the improvement of people's living standards, people's requirements for the quality of domestic drinking water are constantly increasing, and the drinking water quality standards are also constantly evolving and improving accordingly. Since the formulation of domestic drinking water quality standards is related to various factors such as people's living habits, culture, economic conditions, the level of scientific and technological development, water resources, and their water quality status, the requirements for drinking water quality are different not only among different countries but also among different regions of the same country.

[0003] Chinese Patent Publication No. CN108007726A. The present invention relates to a layered sampling device for water quality detection. The technical problem to be solved by the present invention is to provide a layered sampling device for water quality detection with high detection accuracy, high detection efficiency, and capable of sampling and detecting water at different depths. To solve the above technical problems, the present invention provides such a layered sampling device for water quality detection, which includes a sampling box, a partition board, a spring, a baffle, a connecting rod, a rotating shaft, a wire, a pulley, etc.; a pulley is provided in the middle of the top of the sampling box, a wire winding wheel is provided at the right end of the top of the sampling box, a hand crank is provided on the front side of the wire winding wheel, a wire is wound on the wire winding wheel, and at least two partition boards are evenly spaced in the sampling box, and the partition boards divide the sampling box into at least three cavities. The present invention samples water at different depths and then conducts detection. The sampling efficiency is high, and manual operation is adopted, saving a large amount of manpower and material resources.

[0004] When sampling water bodies, it is also necessary to sample water samples at different depths. The existing sampling structures are mostly for surface water sample sampling, and it is difficult to achieve sampling of water body samples at specific depths.

[0005] Therefore, it is necessary to provide a sampling device for water quality detection and a sampling method thereof to solve the above technical problems. Summary of the Invention

[0006] The purpose of the present invention is to provide a sampling device for water quality detection and a sampling method thereof to solve the above technical problems.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a sampling device for water quality detection, comprising a sampling device body, a water immersion chamber is provided inside the sampling device body, a baffle is fixedly connected to the top of the water immersion chamber, a floating device is assembled on the side end surface of the sampling device body, a pressure plate is slidably connected to the inside of the water immersion chamber, an end of the pressure plate facing away from the baffle is fixedly connected to a first air bag, an end of the first air bag facing away from the pressure plate is fixedly connected to a sealed cavity, a sampling chamber is provided at the bottom of the water immersion chamber, a sampling port is connected to the sampling chamber, a liquid inlet manifold is embedded in the inner wall of the water immersion chamber, an input end of the liquid inlet manifold is arranged on the upper part of the inner wall of the water immersion chamber, an output end of the liquid inlet manifold is arranged on the bottom of the inner wall of the water immersion chamber, and the sealed cavity is in contact with the inner wall of the water immersion chamber, and a positioning device for fixing and limiting the sealed cavity is elastically connected to the middle part of the inner wall of the water immersion chamber.

[0008] When in use, after the sampling device body and the floating device are connected, they are put into the water area to be detected. As the sampling device body continues to sink under the action of gravity, the liquid pressure in the immersion chamber continues to increase, thereby causing the first airbag to shrink and the pressure plate to move toward the sealing chamber. As the pressure plate continues to move, the positioning device on the inner wall of the immersion chamber is triggered, so that the positioning device releases the fixation of the sealing chamber, so that the sealing chamber and the pressure plate move upward inside the immersion chamber under the action of the first airbag. An elastic structure can also be provided at the bottom of the sealing chamber to quickly move upward after the positioning device releases the limit. During the upward movement, the two ends of the liquid inlet manifold are connected, so that the liquid at the current depth flows into the interior of the sampling chamber through the liquid inlet manifold. The liquid in the sampling chamber can be collected later through the sampling port. As the pressure plate rises, the liquid inlet end of the liquid inlet manifold is finally closed, thereby cutting off the liquid supply to the interior of the sampling chamber. Since the water pressure is proportional to the depth, the collection of water samples at a specific depth is achieved, and after the collection is completed, the floating device can be quickly and autonomously floated.

[0009] As a further solution of the present invention, the end faces of the sampling device body and the floating device are both provided with cascading pieces and cascading grooves, and the cascading pieces and cascading grooves are both provided with threaded holes. The sampling device body and the floating device are assembled and connected through the cascading pieces and cascading grooves.

[0010] When in use, the sampling device body and the floating device can be disassembled by adapting the cascading plates and cascading grooves and with the help of bolts, etc., which makes it convenient to use and operate.

[0011] As a further solution of the present invention, a positioning groove is formed inside the main body of the sampling device, and the positioning device is movably connected inside the positioning groove. The positioning device includes an arc-shaped convex rod, a positioning device main body, a spring, and a retaining rod. The spring is fixedly connected to one end of the positioning device main body, and the end of the spring facing away from the positioning device main body is elastically connected to the inner wall of the positioning groove. The positioning device main body is elastically connected inside the positioning groove through the spring. On both sides of the end of the positioning device main body facing away from the spring, a positioning device and a retaining rod are respectively fixedly connected.

[0012] As a further solution of the present invention, both the arc-shaped convex rod and the retaining rod penetrate through the main body of the sampling device and extend into the immersion chamber, and the extending length of the retaining rod is greater than that of the arc-shaped convex rod.

[0013] As a further solution of the present invention, an arc-shaped portion adapted to the positioning device is provided at the lower end of the pressure plate. An inclined surface extends from the end of the retaining rod facing away from the positioning device main body, and an inclined surface adapted to the inclined surface is provided at the edge of the upper end surface of the sealing cavity.

[0014] During use, as the pressure plate continuously moves downward, the arc-shaped portion of the pressure plate abuts against the positioning device. As the sinking depth of the main body of the sampling device continuously increases, the pressure of the pressure plate on the positioning device continuously increases. Under the action of the arc-shaped portion, the positioning device is gradually pressed into the positioning groove, thereby driving the retaining rod to move into the positioning groove through the positioning device main body. As the retaining rod moves, the inclined surface is attached to the inclined surface of the upper end surface of the sealing cavity, enabling the sealing cavity to have an upward movement space. As the sealing cavity moves upward, the liquid outlet end of the liquid inlet manifold on the inner wall of the immersion chamber is gradually connected to the sampling chamber. Then, under the liquid pressure, the liquid enters the interior of the liquid inlet manifold from the liquid inlet end of the liquid inlet manifold and enters the interior of the sampling chamber from the liquid outlet end of the liquid inlet manifold. As the liquid in the sampling chamber gradually increases, it pushes the sealing cavity to continuously move upward. And because the sealing cavity is provided with an inclined surface, the sealing cavity presses the positioning device into the positioning groove. When the pressures in the immersion chamber and the sampling chamber are balanced, the pressure plate rises to the top of the immersion chamber and abuts against the baffle. At this time, the side end of the pressure plate abuts against the liquid inlet end of the liquid inlet manifold, closing the liquid inlet manifold. And at this time, the sealing cavity rises above the positioning device. By providing the arc-shaped convex rod and the retaining rod, the sealing cavity can be effectively resisted, preventing the other part in the first airbag from expanding with the change of water pressure and causing the sealing cavity to move downward and invade the sampling liquid in the sampling chamber.

[0015] As a further solution of the present invention, a filter screen is embedded inside the liquid inlet manifold, and rubber layers are embedded at the edges of the side end faces of the sealing cavity and the pressure plate.

[0016] During use, by providing a filter screen inside the liquid inlet manifold, impurities in the effective liquid enter the sampling chamber along with the liquid inlet manifold, which may affect the test results. Additionally, by embedding rubber layers at the edges of the side end faces of the sealing chamber and the pressure plate, the sealing and plugging effects between the sealing chamber, the pressure plate, the output end, and the input end of the liquid inlet manifold are improved.

[0017] As a further aspect of the present invention, the floating device includes a floating device main body, a second airbag, a closing plate, a reaction chamber, and an impact plate. The floating device main body is assembled and connected to the side end face of the sampling device main body. The reaction chamber is formed inside the floating device main body. The closing plate is rotatably connected inside the reaction chamber. The impact plate is fixedly connected to the inner wall of the reaction chamber, and a second airbag is fixedly connected to the impact plate. An azide is attached to the side where the impact plate and the second airbag are in contact.

[0018] As a further aspect of the present invention, a firing pin is elastically connected inside the sampling device main body, and a firing pin groove adapted to the firing pin is provided in the positioning device main body. An impact hole adapted to the firing pin is provided in the inner wall of the reaction chamber.

[0019] During use, when the sealing chamber moves upward and completely presses the positioning device into the positioning groove, the firing pin groove is adapted to the firing pin. Under the elastic force of the elastic member, the firing pin penetrates through the firing pin groove and into the impact hole, and collides with the impact plate, causing the azide attached to the surface of the impact plate to decompose. The azide can be sodium azide, etc. The azide decomposes rapidly to generate gas, causing the second airbag to expand and push open the closing plate, creating a second airbag filled with a large amount of gas inside. The buoyancy generated by the second airbag drives the sampling device main body and the floating device to quickly float to the water surface, facilitating recovery and sample collection by the user. Moreover, after the sampling device main body completes sampling driven by the floating device, it automatically floats, avoiding the problem of underwater impurity entanglement caused by using traction devices such as wires or support rods, and is convenient and efficient to use.

[0020] As a further aspect of the present invention, at least one group of sampling device main bodies is provided. The side end face of the at least one group of sampling device main bodies is assembled and connected to a floating device, and the at least one group of sampling device main bodies and the floating device are assembled and connected through a cascading piece and a cascading groove.

[0021] A sampling method for a sampling device used for water quality detection. After connecting the sampling device main body and the floating device, the sampling device main body and the floating device are put into the water area to be detected. The sampling device main body continuously sinks under the action of gravity, and the liquid pressure in the immersion chamber continuously increases, thereby causing the first airbag to contract and the pressure plate to move towards the sealing chamber. As the pressure plate continuously moves, the positioning device on the inner wall of the immersion chamber is triggered, causing the positioning device to release the fixation of the sealing chamber, so that the sealing chamber and the pressure plate move upward inside the immersion chamber under the action of the first airbag. During the upward movement, the two ends of the liquid inlet manifold are connected, allowing the liquid at the current depth to flow into the sampling chamber through the liquid inlet manifold. Later, the liquid in the sampling chamber can be collected through the sampling port. As the pressure plate rises, the liquid inlet end of the liquid inlet manifold is finally closed, thereby cutting off the liquid supply to the inside of the sampling chamber and completing the collection of the liquid at a specific depth.

[0022] During use, multiple groups of sampling device main bodies can be set. They are interconnected through cascade plates and cascade grooves. By setting the elastic coefficient of the spring or the gas density inside the first airbag, multiple groups of sampling device main bodies can be used to collect samples at different liquid depths. Thus, information on water samples at multiple different depths can be obtained through a single sampling, greatly improving the work efficiency. Moreover, a floating device is connected to the side end face of the sampling device main body, and multiple groups of sampling device main bodies are triggered step by step as the depth continuously decreases. A striker is provided between the floating device and the last triggered sampling device main body for linkage. When the sampling of the last group of sampling device main bodies is completed, the floating device is triggered to drive the whole to float upward.

[0023] Working principle: After connecting the main body of the sampling device and the floating device and putting them into the water area to be detected, as the main body of the sampling device continuously sinks under the action of gravity, the liquid pressure in the immersion chamber continuously increases, which causes the first airbag to contract and the pressure plate to move towards the sealing chamber. As the pressure plate continuously moves, the positioning device on the inner wall of the immersion chamber is triggered, so that the positioning device releases the fixation of the sealing chamber, and the sealing chamber and the pressure plate move upward inside the immersion chamber under the action of the first airbag. It can also be quickly moved upward after the positioning device releases the limit by providing an elastic structure at the bottom of the sealing chamber. During the upward movement, the two ends of the liquid inlet manifold are connected, so that the liquid at the current depth flows into the inside of the sampling chamber through the liquid inlet manifold. Later, the liquid in the sampling chamber can be collected through the sampling port. As the pressure plate rises, the liquid inlet end of the liquid inlet manifold is finally closed, thereby cutting off the liquid supply to the inside of the sampling chamber. Since the water pressure is proportional to the depth, the collection of water samples at a specific depth is realized. After the collection is completed, it can quickly float autonomously through the floating device. The main body of the sampling device and the floating device can be disassembled through the adaptation of the cascade sheet and the cascade groove and with the help of bolts, etc., and the use and operation are relatively convenient. And as the pressure plate continuously moves downward, the arc portion of the pressure plate abuts against the positioning device. As the sinking depth of the main body of the sampling device continuously increases, the pressure of the pressure plate on the positioning device continuously increases, and the positioning device is gradually pressed into the positioning groove under the action of the arc portion. Thus, the shift lever is driven by the main body of the positioning device to move into the positioning groove. As the shift lever moves, the inclined surface of the inclined portion fits with the inclined surface of the upper end surface of the sealing chamber, so that the sealing chamber has an upward movement space. As the sealing chamber moves upward, the liquid outlet end of the liquid inlet manifold on the inner wall of the immersion chamber is gradually connected to the sampling chamber. Then, under the liquid pressure, the liquid enters the inside of the liquid inlet manifold from the liquid inlet end of the liquid inlet manifold and enters the inside of the sampling chamber from the liquid outlet end of the liquid inlet manifold. As the liquid in the sampling chamber gradually increases, it pushes the sealing chamber to continuously move upward. And because the sealing chamber is provided with an inclined surface, the sealing chamber presses the positioning device into the positioning groove. When the pressures in the immersion chamber and the sampling chamber are balanced, the pressure plate rises to the top of the immersion chamber and fits with the baffle. At this time, the side end of the pressure plate fits with the liquid inlet end of the liquid inlet manifold to close the liquid inlet manifold. And at this time, the sealing chamber rises above the positioning device. By providing an arc-shaped convex rod and a shift lever, the sealing chamber can be effectively resisted to prevent the other parts in the first airbag from expanding with the change of water pressure and causing the sealing chamber to move downward and invade the sampling liquid inside the sampling chamber. At the same time, by providing a filter screen inside the liquid inlet manifold, impurities in the liquid are effectively prevented from entering the sampling chamber through the liquid inlet manifold and affecting the detection result. And by embedding rubber layers at the edges of the side end faces of the sealing chamber and the pressure plate, the sealing and plugging effects between the sealing chamber and the pressure plate and the output end and the input end of the liquid inlet manifold are improved. Further, when the sealing chamber moves upward and completely presses the positioning device into the positioning groove, the striker groove is adapted to the striker. Under the elastic force of the elastic member, the striker penetrates through the striker groove and into the impact hole and collides with the impact plate, causing the azide attached to the surface of the impact plate to decompose.Azides such as sodium azide can be used. The azides decompose rapidly to produce gas, causing the second airbag to expand and push open the closing plate, creating a second airbag filled with a large amount of gas inside. The second airbag generates buoyancy to drive the sampling device main body and the floating device to quickly float to the water surface, facilitating recovery and sample collection by the user. Moreover, after the sampling is completed, the floating device drives the sampling device main body to automatically float, avoiding the problem of underwater impurity entanglement caused by using traction devices such as wires or support rods. It is convenient and efficient to use. Additionally, multiple groups of sampling device main bodies can be set up, interconnected through cascading pieces and cascading grooves. By setting the elastic coefficient of the spring or the gas density inside the first airbag, multiple groups of sampling device main bodies can collect samples at different liquid depths. Furthermore, information on water samples at multiple different depths can be obtained through a single sampling, greatly improving the work efficiency. And by connecting a floating device to the side end face of the sampling device main body, and multiple groups of sampling device main bodies are triggered step by step as the depth continuously decreases, the floating device is linked to the last triggered sampling device main body through a striker. When the sampling of the last group of sampling device main bodies is completed, the floating device is triggered to drive the whole to float.

[0024] When the present invention is in use, after connecting the sampling device main body and the floating device, it is put into the water area to be detected. As the sampling device main body continuously sinks under the action of gravity, the liquid pressure in the immersion chamber continuously increases, causing the first airbag to contract and the pressure plate to move towards the sealing chamber. As the pressure plate continuously moves, the positioning device on the inner wall of the immersion chamber is triggered, releasing the fixation of the sealing chamber. Then, the sealing chamber and the pressure plate move upward inside the immersion chamber under the action of the first airbag. It is also possible to set an elastic structure at the bottom of the sealing chamber to quickly move upward after the positioning device releases the limit. During the upward movement, the two ends of the liquid inlet manifold are connected, allowing the liquid at the current depth to flow into the sampling chamber through the liquid inlet manifold. Later, the liquid in the sampling chamber can be collected through the sampling port. As the pressure plate rises, finally, the liquid inlet end of the liquid inlet manifold is closed, cutting off the liquid supply to the inside of the sampling chamber. Since the water pressure is proportional to the depth, the collection of water samples at a specific depth is achieved, and after the collection is completed, it can quickly and autonomously float through the floating device. Brief Description of the Drawings

[0025] The present invention will be further described below in conjunction with the drawings and embodiments.

[0026] Figure 1 is the overall structural schematic diagram of the present invention;

[0027] Figure 2 is the internal structural schematic diagram of the sampling device of the present invention;

[0028] Figure 3 is the sectional structural schematic diagram of the sampling device of the present invention;

[0029] Figure 4 It is a schematic diagram of the structure of the positioning device of the present invention;

[0030] Figure 5 The present invention Figure 2 The enlarged structural diagram at A in the middle;

[0031] Figure 6 It is a schematic diagram of the internal structure of the floating device of the present invention;

[0032] Figure 7 It is a schematic diagram of the cascade structure of multiple groups of sampling devices of the present invention;

[0033] Figure 8 It is a schematic diagram of the structure of the sampling device of the present invention in an untriggered state;

[0034] Figure 9 The present invention Figure 8 The enlarged structural diagram at B in the middle;

[0035] Figure 10 It is a schematic diagram of the trigger state structure of the sampling device of the present invention;

[0036] Figure 11 It is a schematic diagram of the structure of the sampling device of the present invention after sampling is completed;

[0037] Figure 12 The present invention Figure 11 Enlarged structural diagram at point C in the middle.

[0038] In the figure: 1. sampling device body; 2. baffle; 3. immersion chamber; 4. cascade plate; 5. floating device; 6. cascade groove; 7. striker; 8. liquid inlet manifold; 9. sampling port; 10. sampling chamber; 11. sealing chamber; 12. first air bag; 13. pressure plate; 14. positioning device; 15. arc-shaped protruding rod; 16. positioning device body; 17. spring; 18. striker groove; 19. gear lever; 20. inclined portion; 21. rubber layer; 22. filter; 23. floating device body; 24. second air bag; 25. closing plate; 26. reaction chamber; 27. striker plate; 28. impact hole; 29. positioning groove. DETAILED DESCRIPTION

[0039] Embodiment 1

[0040] like Figures 1-3As shown, a sampling device for water quality detection includes a sampling device body 1, a water immersion chamber 3 is provided inside the sampling device body 1, a baffle 2 is fixedly connected to the top of the water immersion chamber 3, a floating device 5 is assembled and connected to the side end surface of the sampling device body 1, a pressure plate 13 is slidably connected inside the water immersion chamber 3, an end of the pressure plate 13 away from the baffle 2 is fixedly connected to a first air bag 12, an end of the first air bag 12 away from the pressure plate 13 is fixedly connected to a sealed cavity 11, a sampling chamber 10 is provided at the bottom of the water immersion chamber 3, the sampling chamber 10 is connected to a sampling port 9, a liquid inlet manifold 8 is embedded in the inner wall of the water immersion chamber 3, the input end of the liquid inlet manifold 8 is arranged at the upper part of the inner wall of the water immersion chamber 3, the output end of the liquid inlet manifold 8 is arranged at the bottom of the inner wall of the water immersion chamber 3, and the sealed cavity 11 is in contact with the inner wall of the water immersion chamber 3, and a positioning device 14 for fixing and limiting the sealed cavity 11 is elastically connected to the middle part of the inner wall of the water immersion chamber 3.

[0041] When in use, after the sampling device body 1 and the floating device 5 are connected, they are put into the water area that needs to be tested. As the sampling device body 1 continues to sink under the action of gravity, the liquid pressure in the immersion chamber 3 continues to increase, thereby causing the first airbag 12 to contract and the pressure plate 13 to move toward the sealed chamber 11. As the pressure plate 13 continues to move, the positioning device 14 on the inner wall of the immersion chamber 3 is triggered, so that the positioning device 14 releases the fixation of the sealed chamber 11, so that the sealed chamber 11 and the pressure plate 13 move upward inside the immersion chamber 3 under the action of the first airbag 12. An elastic structure is provided at the bottom of 11, and it moves upward quickly after the positioning device 14 releases the limit. During the upward movement, the two ends of the liquid inlet manifold 8 are connected, so that the liquid at the current depth flows into the interior of the sampling chamber 10 through the liquid inlet manifold 8. Later, the liquid in the sampling chamber 10 can be collected through the sampling port 9. As the pressure plate 13 rises, the liquid inlet end of the liquid inlet manifold 8 is finally closed, thereby cutting off the liquid supply to the interior of the sampling chamber 10. Since the water pressure is proportional to the depth, the collection of water samples at a specific depth is achieved, and after the collection is completed, it can float rapidly and autonomously through the floating device 5.

[0042] Embodiment 2

[0043] like Figures 1-3 As shown, on the basis of the first embodiment, the end faces of the sampling device body 1 and the floating device 5 that are in contact are provided with cascading pieces 4 and cascading grooves 6, and the cascading pieces 4 and the cascading grooves 6 are provided with threaded holes, and the sampling device body 1 and the floating device 5 are assembled and connected via the cascading pieces 4 and the cascading grooves 6.

[0044] When in use, the sampling device body 1 and the floating device 5 can be disassembled by adapting the cascading plates 4 and the cascading grooves 6 and with the help of bolts, etc., which is convenient to use and operate.

[0045] like Figures 1-4As shown in Figures 8 - 12, a positioning groove 29 is formed inside the sampling device main body 1. The positioning device 14 is movably connected inside the positioning groove 29. The positioning device 14 includes an arc-shaped convex rod 15, a positioning device main body 16, a spring 17, and a stop rod 19. One end of the spring 17 is fixedly connected to the positioning device main body 16, and the end of the spring 17 facing away from the positioning device main body 16 is elastically connected to the inner wall of the positioning groove 29. The positioning device main body 16 is elastically connected inside the positioning groove 29 through the spring 17. On both sides of the end of the positioning device main body 16 facing away from the spring 17, a positioning device 14 and a stop rod 19 are respectively fixedly connected.

[0046] As Figures 1-4 As shown in Figures 8 - 12, both the arc-shaped convex rod 15 and the stop rod 19 penetrate through the sampling device main body 1 and extend into the immersion chamber 3, and the extending length of the stop rod 19 is greater than that of the arc-shaped convex rod 15.

[0047] As Figures 1-4 As shown in Figures 8 - 12, an arc-shaped portion adapted to the positioning device 14 is provided at the lower end of the pressure plate 13. An inclined surface portion 20 extends from the end of the stop rod 19 facing away from the positioning device main body 16, and an inclined surface adapted to the inclined surface portion 20 is provided at the edge of the upper end surface of the sealing cavity 11.

[0048] During use, as the pressure plate 13 continuously moves downward, the arc-shaped portion of the pressure plate 13 abuts against the positioning device 14. As the sinking depth of the sampling device main body 1 continuously increases, the pressure of the pressure plate 13 on the positioning device 14 continuously increases. Under the action of the arc-shaped portion, the positioning device 14 is gradually pressed into the positioning groove 29, thereby driving the stop rod 19 to move into the positioning groove 29 through the positioning device main body 16. As the stop rod 19 moves, the inclined surface portion 20 fits with the inclined surface of the upper end surface of the sealing cavity 11, enabling the sealing cavity 11 to have an upward movement space. As the sealing cavity 11 moves upward, the liquid outlet end of the liquid inlet manifold 8 on the inner wall of the immersion chamber 3 is gradually connected to the sampling chamber 10. Then, under the liquid pressure, the liquid enters the interior of the liquid inlet manifold 8 from the liquid inlet end of the liquid inlet manifold 8 and enters the interior of the sampling chamber 10 from the liquid outlet end of the liquid inlet manifold 8. As the liquid in the sampling chamber 10 gradually increases, it pushes the sealing cavity 11 to continuously move upward. And because the sealing cavity 11 is provided with an inclined surface, the sealing cavity 11 presses the positioning device 14 into the positioning groove 29. When the pressures in the immersion chamber 3 and the sampling chamber 10 are balanced, the pressure plate 13 rises to the top of the immersion chamber 3 and abuts against the baffle 2. At this time, the side end of the pressure plate 13 abuts against the liquid inlet end of the liquid inlet manifold 8, closing the liquid inlet manifold 8. And at this time, the sealing cavity 11 rises above the positioning device 14. By providing the arc-shaped convex rod 15 and the stop rod 19, the sealing cavity 11 can be effectively resisted, preventing other parts in the first airbag 12 from expanding with the water pressure change and causing the sealing cavity 11 to move downward and invade the sampling liquid in the sampling chamber 10.

[0049] As Figures 1-5As shown, a filter screen 22 is embedded inside the liquid inlet manifold 8, and rubber layers 21 are embedded at the edges of the side end faces of the sealing cavity 11 and the pressure plate 13.

[0050] During use, by providing the filter screen 22 inside the liquid inlet manifold 8, impurities in the effective liquid enter the sampling chamber 10 along with the liquid inlet manifold 8, affecting the test results. And by embedding the rubber layers 21 at the edges of the side end faces of the sealing cavity 11 and the pressure plate 13, the sealing effect between the sealing cavity 11 and the pressure plate 13 and the output end and input end of the liquid inlet manifold 8 is improved.

[0051] As Figures 1-6 shown, the floating device 5 includes a floating device main body 23, a second airbag 24, a closing plate 25, a reaction chamber 26, and an impact plate 27. The floating device main body 23 is assembled and connected to the side end face of the sampling device main body 1. The reaction chamber 26 is opened inside the floating device main body 23. The closing plate 25 is rotatably connected inside the reaction chamber 26. The impact plate 27 is fixedly connected to the inner wall of the reaction chamber 26, and a second airbag 24 is fixedly connected to the impact plate 27. An azide is attached to the side where the impact plate 27 and the second airbag 24 are in contact.

[0052] As Figures 1-6 shown in FIGS. 8 - 12, a firing pin 7 is elastically connected inside the sampling device main body 1, and the positioning device main body 16 is provided with a firing pin groove 18 adapted to the firing pin 7, and the inner wall of the reaction chamber 26 is provided with an impact hole 28 adapted to the firing pin 7.

[0053] During use, when the sealing cavity 11 moves upward and completely presses the positioning device 14 into the positioning groove 29, the firing pin groove 18 is adapted to the firing pin 7. Under the elastic force of the elastic member, the firing pin 7 passes through the firing pin groove 18 and penetrates into the impact hole 28, and collides with the impact plate 27, causing the azide attached to the surface of the impact plate 27 to decompose. The azide can be sodium azide, etc. The azide decomposes rapidly to generate gas, causing the second airbag 24 to expand and push open the closing plate 25, generating a second airbag 24 filled with a large amount of gas inside. The buoyancy generated by the second airbag 24 drives the sampling device main body 1 and the floating device 5 to quickly float to the water surface, facilitating the user to recover and collect samples. And by driving the sampling device main body 1 to automatically float after sampling by the floating device 5, the problem of underwater impurity entanglement caused by using traction devices such as wires or support rods is avoided, and the use is convenient and efficient.

[0054] As Figures 1-7 shown, there is at least one group of sampling device main bodies 1. The side end faces of at least one group of sampling device main bodies 1 are assembled and connected with floating devices 5, and at least one group of sampling device main bodies 1 and floating devices 5 are assembled and connected through cascading pieces 4 and cascading grooves 6.

[0055] A sampling method for a sampling device used in water quality detection. After connecting the sampling device main body 1 and the floating device 5, the sampling device main body 1 and the floating device 5 are put into the water area to be detected. The sampling device main body 1 continuously sinks under the action of gravity, and the liquid pressure in the immersion chamber 3 continuously increases, thereby causing the first airbag 12 to contract and the pressure plate 13 to move towards the sealing chamber 11. As the pressure plate 13 continuously moves, the positioning device 14 on the inner wall of the immersion chamber 3 is triggered, causing the positioning device 14 to release the fixation of the sealing chamber 11, so that the sealing chamber 11 and the pressure plate 13 move upward inside the immersion chamber 3 under the action of the first airbag 12. During the upward movement, both ends of the liquid inlet manifold 8 are connected, allowing the liquid at the current depth to flow into the sampling chamber 10 through the liquid inlet manifold 8. Later, the liquid in the sampling chamber 10 can be collected through the sampling port 9. As the pressure plate 13 rises, the liquid inlet end of the liquid inlet manifold 8 is finally closed, thereby cutting off the liquid supply to the inside of the sampling chamber 10 and completing the collection of the liquid at a specific depth.

[0056] During use, multiple sets of the sampling device main body 1 can be set up and cascaded with each other through the cascading piece 4 and the cascading groove 6. By setting the elastic coefficient of the spring 17 or the gas density inside the first airbag 12, multiple sets of the sampling device main body 1 can be used to collect samples at different liquid depths. Thus, information on water samples at multiple different depths can be obtained through a single sampling, greatly improving the work efficiency. Moreover, a floating device 5 is connected to the side end face of the sampling device main body 1, and multiple sets of the sampling device main body 1 are triggered step by step as the depth continuously decreases. The floating device 5 and the last triggered sampling device main body 1 are linked through a striker 7. When the last set of the sampling device main body 1 finishes sampling, the floating device 5 is triggered to drive the whole to float upward.

[0057] Working principle: After connecting the main body 1 of the sampling device and the floating device 5 and putting them into the water area to be detected, as the main body 1 of the sampling device continuously sinks under the action of gravity, the liquid pressure in the immersion chamber 3 continuously increases, which in turn causes the first airbag 12 to contract and the pressure plate 13 to move towards the sealing chamber 11. As the pressure plate 13 continuously moves, the positioning device 14 on the inner wall of the immersion chamber 3 is triggered, so that the positioning device 14 releases the fixation of the sealing chamber 11, and the sealing chamber 11 and the pressure plate 13 move upward inside the immersion chamber 3 under the action of the first airbag 12. It can also be quickly moved upward by providing an elastic structure at the bottom of the sealing chamber 11 after the positioning device 14 releases the limit. During the upward movement, the two ends of the liquid inlet manifold 8 are connected, so that the liquid at the current depth flows into the inside of the sampling chamber 10 through the liquid inlet manifold 8. Later, the liquid in the sampling chamber 10 can be collected through the sampling port 9. As the pressure plate 13 rises, the liquid inlet end of the liquid inlet manifold 8 is finally closed, thereby cutting off the liquid supply to the inside of the sampling chamber 10. Since the water pressure is proportional to the depth, the collection of water samples at a specific depth is realized, and after the collection is completed, it can quickly float autonomously through the floating device 5. The main body 1 of the sampling device and the floating device 5 can be disassembled by matching the cascade pieces 4 and the cascade grooves 6 and with the help of bolts, etc., and the use and operation are relatively convenient. And as the pressure plate 13 continuously moves downward, the arc portion of the pressure plate 13 abuts against the positioning device 14. As the sinking depth of the main body 1 of the sampling device continuously increases, the pressure of the pressure plate 13 on the positioning device 14 continuously increases, and under the action of the arc portion, the positioning device 14 is gradually pressed into the positioning groove 29, so that the shift lever 19 is driven by the positioning device main body 16 to move into the positioning groove 29. As the shift lever 19 moves, the inclined surface portion 20 fits with the inclined surface of the upper end surface of the sealing chamber 11, so that the sealing chamber 11 has an upward movement space. As the sealing chamber 11 moves upward, the liquid outlet end of the liquid inlet manifold 8 on the inner wall of the immersion chamber 3 is gradually connected to the sampling chamber 10. Then, under the liquid pressure, the liquid enters the inside of the liquid inlet manifold 8 from the liquid inlet end of the liquid inlet manifold 8 and enters the inside of the sampling chamber 10 from the liquid outlet end of the liquid inlet manifold 8. As the liquid in the sampling chamber 10 gradually increases, it pushes the sealing chamber 11 to move upward continuously. And because the sealing chamber 11 is provided with an inclined surface, the sealing chamber 11 presses the positioning device 14 into the positioning groove 29. When the pressures in the immersion chamber 3 and the sampling chamber 10 are balanced, the pressure plate 13 rises to the top of the immersion chamber 3 and abuts against the baffle 2. At this time, the side end of the pressure plate 13 fits with the liquid inlet end of the liquid inlet manifold 8 to close the liquid inlet manifold 8. And at this time, the sealing chamber 11 rises above the positioning device 14. By providing the arc-shaped convex rod 15 and the shift lever 19, the sealing chamber 11 can be effectively resisted to prevent other parts in the first airbag 12 from expanding with the change of water pressure and causing the sealing chamber 11 to move downward and invade the sampling liquid inside the sampling chamber 10. At the same time, by providing a filter screen 22 inside the liquid inlet manifold 8, impurities in the effective liquid are prevented from entering the sampling chamber 10 through the liquid inlet manifold 8 and affecting the detection result.And by embedding a rubber layer 21 at the edge of the side end face of the sealed cavity 11 and the pressure plate 13, the sealing effect of the sealed cavity 11 and the pressure plate 13 with the output end and the input end of the liquid inlet manifold 8 is improved. Further, when the sealed cavity 11 moves upward and the positioning device 14 is completely pressed into the positioning groove 29, the firing pin groove 18 is adapted to the firing pin 7. Under the elastic force of the elastic member, the firing pin 7 penetrates through the firing pin groove 18 and into the impact hole 28, and collides with the impact plate 27, causing the azide attached to the surface of the impact plate 27 to decompose. The azide can be sodium azide, etc. The azide decomposes rapidly to generate gas, causing the second airbag 24 to expand and push open the closing plate 25, generating a second airbag 24 filled with a large amount of gas inside. The buoyancy generated by the second airbag 24 drives the sampling device main body 1 and the floating device 5 to quickly float to the water surface, facilitating recovery and sample collection by the user. Moreover, after the sampling device main body 1 is driven by the floating device 5 to complete sampling, it automatically floats, avoiding the problem of underwater impurity entanglement caused by using traction devices such as wires or support rods. It is convenient and efficient to use. And multiple groups of sampling device main bodies 1 can be set, and they are cascaded with each other through the cascade piece 4 and the cascade groove 6. By setting the elastic coefficient of the spring 17 or the gas density inside the first airbag 12, sample collection at different liquid depths can be achieved for multiple groups of sampling device main bodies 1. Furthermore, information on water samples at multiple different depths can be obtained through one sampling, greatly improving the working efficiency. And by connecting a floating device 5 to the side end face of the sampling device main body 1, and multiple groups of sampling device main bodies 1 are triggered step by step as the depth continuously decreases, the floating device 5 and the last triggered sampling device main body 1 are linked through a firing pin 7. When the sampling of the last group of sampling device main bodies 1 is completed, the floating device 5 is triggered to drive the whole to float upward.

Claims

1. A sampling device for water quality detection, comprising a sampling device main body, characterized in that: Inside the main body of the sampling device, there is a water immersion chamber. A baffle is fixedly connected to the top of the water immersion chamber. A floating device is assembled and connected to the side end face of the main body of the sampling device. A pressure plate is slidably connected inside the water immersion chamber. One end of the pressure plate facing away from the baffle is fixedly connected to a first airbag. One end of the first airbag facing away from the pressure plate is fixedly connected to a sealing chamber. A sampling chamber is opened at the bottom of the water immersion chamber. The sampling chamber is communicated with a sampling port. A liquid inlet manifold is embedded in the inner wall of the water immersion chamber. The input end of the liquid inlet manifold is arranged at the upper part of the inner wall of the water immersion chamber, and the output end of the liquid inlet manifold is arranged at the bottom of the inner wall of the water immersion chamber. The sealing chamber is in fit with the inner wall of the water immersion chamber. In the middle of the inner wall of the water immersion chamber, there is a positioning device elastically connected for fixing and limiting the sealing chamber; A positioning groove is opened inside the main body of the sampling device. The positioning device is movably connected inside the positioning groove. The positioning device includes an arc-shaped convex rod, a positioning device main body, a spring and a stop rod. The spring is fixedly connected to one end of the positioning device main body. One end of the spring facing away from the positioning device main body is elastically connected to the inner wall of the positioning groove. The positioning device main body is elastically connected inside the positioning groove through the spring. On both sides of the end of the positioning device main body facing away from the spring, a positioning device and a stop rod are respectively fixedly connected; Both the arc-shaped convex rod and the stop rod penetrate through the main body of the sampling device and extend into the water immersion chamber. The extending length of the stop rod is greater than that of the arc-shaped convex rod; An arc-shaped part adapted to the positioning device is arranged at the lower end of the pressure plate. An inclined surface is extended at one end of the stop rod facing away from the positioning device main body. An inclined surface adapted to the inclined surface is arranged at the edge of the upper end face of the sealing chamber.

2. The sampling device for water quality detection according to claim 1, characterized in that: Cascade pieces and cascade grooves are arranged on the end faces where the main body of the sampling device and the floating device are in contact. Threaded holes are opened in both the cascade pieces and the cascade grooves. The main body of the sampling device and the floating device are assembled and connected through the cascade pieces and the cascade grooves.

3. The sampling device for water quality detection according to claim 1, characterized in that: A filter screen is embedded inside the liquid inlet manifold, and rubber layers are embedded at the edges of the side end faces of both the sealing chamber and the pressure plate.

4. The sampling device for water quality detection according to claim 1, characterized in that: The floating device includes a floating device main body, a second airbag, a closing plate, a reaction chamber and an impact plate. The floating device main body is assembled and connected to the side end face of the main body of the sampling device. The reaction chamber is opened inside the floating device main body. The closing plate is rotatably connected inside the reaction chamber. The impact plate is fixedly connected to the inner wall of the reaction chamber, and a second airbag is fixedly connected to the impact plate. An azide is attached to the side where the impact plate and the second airbag are in contact.

5. The sampling device for water quality detection according to claim 4, characterized in that: A firing pin is elastically connected inside the main body of the sampling device. A firing pin groove adapted to the firing pin is opened in the positioning device main body. An impact hole adapted to the firing pin is opened in the inner wall of the reaction chamber.

6. A sampling method for a sampling device used in water quality detection, which uses a sampling device for water quality detection as described in any one of claims 1-5, characterized in that: After connecting the sampling device main body and the floating device, the sampling device main body and the floating device are put into the water area to be detected. Under the action of gravity, the sampling device main body sinks continuously, and the liquid pressure in the immersion chamber increases continuously, which in turn causes the first airbag to contract and the pressure plate to move towards the sealing chamber. As the pressure plate moves continuously, the positioning device on the inner wall of the immersion chamber is triggered, causing the positioning device to release the fixation of the sealing chamber, so that the sealing chamber and the pressure plate move upward inside the immersion chamber under the action of the first airbag. During the upward movement, the two ends of the liquid inlet manifold are connected, so that the liquid at the current depth flows into the sampling chamber through the liquid inlet manifold. Later, the liquid in the sampling chamber can be collected through the sampling port. As the pressure plate rises, the liquid inlet end of the liquid inlet manifold is finally closed, thereby cutting off the liquid supply to the inside of the sampling chamber and completing the collection of the liquid at a specific depth.

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