A sampling device for water quality detection

Abstract

The present invention belongs to the technical field of water quality sampling, and discloses a sampling device for water quality detection, which includes a bottom shell. A tank cover is movably installed on the upper surface of the bottom shell. A clamping cover is clamped in the middle of the upper surface of the tank cover. A compression airbag is fixedly connected to the lower surface of the clamping cover. A plurality of pipe sleeves are slidably connected in the middle of the tank cover. A connecting rod is fixedly connected inside the pipe sleeve. A sealing gasket is fixedly connected to the lower end of the connecting rod. In the present invention, when the rectangular plate contacts the limiting block, the water pressure will open the one-way valve, and the water at the target depth will quickly enter the through hole, the hose, and the connector, and finally enter the inside of the collection pipe. The sealing gasket will lift upward according to the volume of water entering the inside of the collection pipe until the protrusion of the pipe sleeve contacts the lower surface of the tank cover. During the process, for every volume of water entering the inside of the collection pipe, the pipe sleeve will protrude upward by the corresponding volume, so as to keep the buoyancy of the present invention unchanged during the sampling process, thereby completing the accurate sampling at the target depth.

Description

Technical Field

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

[0002] The scope of water quality detection is very wide, including unpolluted and polluted natural waters (rivers, lakes, seas) and various industrial wastewaters, etc. The main monitoring items can be divided into two categories: one is the comprehensive indicators reflecting the water quality status, such as temperature, chromaticity, turbidity, pH value, conductivity, suspended solids, dissolved oxygen, chemical oxygen demand, and biochemical oxygen demand, etc.; the other is some toxic substances, such as phenol, cyanide, arsenic, lead, chromium, cadmium, mercury, and organic pesticides, etc. Water sample collection is an important link in water quality detection. Through the comprehensive analysis of the water body detection results, it is more conducive to mastering and judging the true pollution situation of the water body.

[0003] When the existing device suspends at the target depth for precise sampling, during the process of the syringe-like suction mechanism sampling the water body at the target depth, the volume of the device will change, which causes the buoyancy of the device to change, resulting in the device sinking or floating away from the target depth, and ultimately reducing the sampling accuracy. Summary of the Invention

[0004] The purpose of the present invention is to provide a sampling device for water quality detection to solve the problems raised in the above background art.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A sampling device for water quality detection, including a bottom shell, on the upper surface of the bottom shell, a tank cover is movably installed, in the middle of the upper surface of the tank cover, a clamping cover is clamped, on the lower surface of the clamping cover, a compression airbag is fixedly connected, in the middle of the tank cover, a plurality of pipe sleeves are slidably connected, inside the pipe sleeve, a connecting rod is fixedly connected, at the lower end of the connecting rod, a sealing gasket is fixedly connected, at the center of the bottom of the bottom shell, an air tank is fixedly installed, at the upper end of the air tank, an exhaust valve is fixedly installed, inside the bottom shell, a plurality of collecting pipes are arranged, at the bottom of the collecting pipe, a connecting sleeve is fixedly connected, at the top end inside the connecting sleeve, a return spring is fixedly connected, at the bottom end of the return spring, a sliding pad is fixedly connected, directly below the connecting sleeve, a connecting head is arranged, at the lower end of the connecting head, a hose is fixedly connected, below the hose, an installation cavity is opened, inside the installation cavity, an adjusting mechanism is arranged, below the adjusting mechanism, a rectangular cavity is opened, on the inner side of the rectangular cavity, a sliding rod is fixedly connected, on the outer end of the sliding rod, a rectangular plate is slidably connected, between the rectangular plate and the inner wall of the rectangular cavity, a compression spring is fixedly connected, on the curved surface of the bottom shell, a rotating mechanism is rotatably installed, on the curved surface of the bottom shell, a plurality of nozzles are fixedly installed.

[0006] Preferably, the adjusting mechanism includes an adjusting plate. A through hole is formed in the middle of the adjusting plate. A one-way valve is fixedly installed at the bottom of the through hole. One side of the adjusting plate is threadedly connected with an adjusting rod, and the other side of the adjusting plate is slidably connected with a fixing rod. The lower end of the adjusting plate is fixedly connected with a sealing plate, and a limiting block is fixedly connected to the lower surface of the sealing plate.

[0007] Preferably, the rotating mechanism includes two rotating plates. A plurality of fan-shaped holes are formed in the middle of the rotating plates. A plurality of electromagnets and a plurality of permanent magnets are fixedly connected to the edges of the rotating plates.

[0008] Preferably, the lower end of the compression airbag is fixedly connected to the can lid. The compression airbag is annular. There are protrusions inside the pipe sleeve. Grooves are formed on the lower surface of the sealing gasket. The sealing gasket is adapted to the collection pipe. The sliding gasket is slidably connected to the connecting sleeve. The connecting head is fixedly connected to the bottom shell. The rectangular plate is adapted to the rectangular cavity and has good sealing performance. The inside of the air tank is filled with an appropriate amount of compressed gas. The nozzle is communicated with the inside of the bottom shell. The pipe sleeve is clamped with the collection pipe.

[0009] Preferably, the upper end of the adjusting plate is communicated with a hose. The adjusting plate is slidably connected to the installation cavity. The adjusting rod is rotatably connected to the bottom shell. The fixing rod is fixedly connected to the bottom shell. The sealing plate is slidably connected to the bottom shell. The lower surface of the sealing plate contacts the rectangular plate. The opening direction of the one-way valve is from the rectangular cavity to the inside of the collection pipe.

[0010] Preferably, both of the two rotating plates are rotatably connected to the bottom shell. The permanent magnets are located on one side of the electromagnets. The two rotating plates are symmetrically arranged.

[0011] The beneficial effects of the present invention are as follows:

[0012] 1. In the present invention, the rectangular plate contacts the limiting block, the water pressure causes the one-way valve to open, the water at the target depth quickly enters the through hole, the hose, the connecting head, and finally enters the inside of the collection pipe. The sealing gasket will lift upward according to the volume of water entering the inside of the collection pipe until the protrusion of the pipe sleeve contacts the lower surface of the can lid. During the process, for every volume of water entering the inside of the collection pipe, the pipe sleeve will protrude upward by the corresponding volume, so as to keep the buoyancy of the present invention unchanged during the sampling process, thereby completing the accurate sampling at the target depth.

[0013] 2. The present invention drives the adjustment plate to move inward or outward by rotating the adjustment rod, so that the limit block moves with the adjustment plate, and the position of the through hole is adjusted. When the position of the through hole is adjusted to the position corresponding to the sampling depth, the movement is stopped. When multiple samplings at the same depth are performed, all the adjustment plates are adjusted to the same position, and when single sampling at different depths is performed, multiple adjustment plates are adjusted to corresponding positions of different depths required for sampling, thereby simply and conveniently completing multiple samplings at the same depth or single sampling at different depths.

[0014] 3. By placing the present invention in water, sampling is completed during the sinking process. After sampling is completed, the exhaust valve is opened, and the gas inside the gas tank is discharged, so that the gas pressure in the internal space of the bottom shell is slowly increased, which will cause the card cover to detach from the tank cover and bring out the compressed air bag. The gas discharged from the gas tank will enter the compressed air bag, thereby increasing the buoyancy of the present invention, achieving rapid buoyancy and finally floating to the surface. Not only is the operation simple when sampling water bodies, but the recovery is also more convenient without the need for an external power device.

[0015] 4. Before using the present invention, the collecting tube is clamped inside the tube sleeve, and then the tank cover is installed on the top of the bottom shell. During the process, when the sliding pad contacts the connecting head, it will be squeezed and moved upward, so that the inside of the collecting tube is connected with the inside of the connecting head. After floating to the water surface, the tank cover is opened to drive the tube sleeve and the sealing gasket to move upward. During the process, the water of the target depth remaining in the adjusting plate, the hose and the connecting head will be sucked out, thereby avoiding the water samples remaining in the hose and the connecting head from interfering with subsequent water sampling, further ensuring the accuracy of sampling. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the appearance structure of the present invention;

[0017] Figure 2 A half-section schematic diagram of the bottom shell of the present invention;

[0018] Figure 3 This is a half-section schematic diagram of a rectangular cavity of the present invention;

[0019] Figure 4 For the present invention Figure 3 The enlarged schematic diagram at A in the middle;

[0020] Figure 5 A half-section schematic diagram of an adjustment plate of the present invention;

[0021] Figure 6 It is a schematic diagram of the structure of the rotating mechanism of the present invention.

[0022] In the figure: 1, bottom case; 2, tank lid; 3, clamping lid; 4, compression airbag; 5, pipe sleeve; 6, connecting rod; 7, gasket; 8, gas cylinder; 9, exhaust valve; 10, collecting pipe; 11, connecting sleeve; 12, return spring; 13, sliding pad; 14, connector; 15, hose; 16, installation cavity; 17, adjusting mechanism; 171, adjusting plate; 172, through hole; 173, one-way valve; 174, adjusting rod; 175, fixed rod; 176, sealing plate; 177, limiting block; 18, rectangular cavity; 19, sliding rod; 20, rectangular plate; 21, compression spring; 22, rotating mechanism; 221, rotating plate; 222, sector hole; 223, electromagnet; 224, permanent magnet; 23, nozzle. Detailed implementation manner

[0023] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0024] Such as Figures 1 to 6As shown in the figure, an embodiment of the present invention provides a sampling device for water quality detection, including a bottom shell 1. A tank cover 2 is movably installed on the upper surface of the bottom shell 1. A clamping cover 3 is clamped in the middle of the upper surface of the tank cover 2. A compression airbag 4 is fixedly connected to the lower surface of the clamping cover 3. A plurality of pipe sleeves 5 are slidably connected in the middle of the tank cover 2. A connecting rod 6 is fixedly connected inside the pipe sleeve 5. A sealing gasket 7 is fixedly connected to the lower end of the connecting rod 6. A gas tank 8 is fixedly installed at the center of the bottom of the bottom shell 1. An exhaust valve 9 is fixedly installed at the upper end of the gas tank 8. A plurality of collecting pipes 10 are arranged inside the bottom shell 1. A connecting sleeve 11 is fixedly connected to the bottom of the collecting pipe 10. A return spring 12 is fixedly connected to the top end inside the connecting sleeve 11. A sliding pad 13 is fixedly connected to the bottom end of the return spring 12. A connecting head 14 is arranged directly below the connecting sleeve 11. A hose 15 is fixedly connected to the lower end of the connecting head 14. An installation cavity 16 is opened below the hose 15. An adjusting mechanism 17 is arranged inside the installation cavity 16. A rectangular cavity 18 is opened below the adjusting mechanism 17. A sliding rod 19 is fixedly connected to the inner side of the rectangular cavity 18. A rectangular plate 20 is slidably connected to the outer end of the sliding rod 19. A compression spring 21 is fixedly connected between the rectangular plate 20 and the inner wall of the rectangular cavity 18. A rotating mechanism 22 is rotatably installed on the curved surface of the bottom shell 1. A plurality of nozzles 23 are fixedly installed on the curved surface of the bottom shell 1. Its function is that by placing the present invention in water, sampling is completed during the sinking process. After sampling is completed, the exhaust valve 9 is opened, and the gas inside the gas tank 8 is discharged, so that the gas pressure in the internal space of the bottom shell 1 slowly increases, which will cause the clamping cover 3 to separate from the tank cover 2 and bring out the compression airbag 4. The gas discharged from the gas tank 8 will enter the compression airbag 4, thereby increasing the buoyancy of the present invention and realizing rapid floating until it finally floats out of the water surface. It is not only simple to operate during water body sampling, but also convenient to recover without an additional power device.

[0025] Among them, the adjusting mechanism 17 includes an adjusting plate 171. A through hole 172 is opened in the middle of the adjusting plate 171. A one-way valve 173 is fixedly installed at the bottom of the through hole 172. An adjusting rod 174 is threadedly connected to one side of the adjusting plate 171. A fixed rod 175 is slidably connected to the other side of the adjusting plate 171. A sealing plate 176 is fixedly connected to the lower end of the adjusting plate 171. A limiting block 177 is fixedly connected to the lower surface of the sealing plate 176. Its function is that when the rectangular plate 20 contacts the limiting block 177, the water pressure will open the one-way valve 173, and the water at the target depth will quickly enter the through hole 172, the hose 15, the connecting head 14, and finally enter the inside of the collecting pipe 10. The sealing gasket 7 will lift upward according to the volume of water entering the inside of the collecting pipe 10 until the protrusion of the pipe sleeve 5 contacts the lower surface of the tank cover 2. During the process, for every volume of water entering the inside of the collecting pipe 10, the pipe sleeve 5 will protrude upward by the corresponding volume, so as to keep the buoyancy of the present invention unchanged during the sampling process, thereby completing accurate sampling at the target depth.

[0026] Among them, the rotating mechanism 22 includes two rotating plates 221. Multiple fan-shaped holes 222 are provided in the middle of the rotating plate 221. A plurality of electromagnets 223 and a plurality of permanent magnets 224 are fixedly connected to the edge of the rotating plate 221. The lower end of the compression airbag 4 is fixedly connected to the can lid 2. The compression airbag 4 is annular. A protrusion is provided on the inner side of the pipe sleeve 5. A groove is provided on the lower surface of the sealing gasket 7. The sealing gasket 7 is adapted to the collection pipe 10. The sliding gasket 13 is slidably connected to the connecting sleeve 11. The connecting head 14 is fixedly connected to the bottom case 1. The rectangular plate 20 is adapted to the rectangular cavity 18 and has good sealing performance. The inside of the air tank 8 is filled with an appropriate amount of compressed gas. The nozzle 23 is communicated with the inside of the bottom case 1. The pipe sleeve 5 is snap-connected to the collection pipe 10. Its function is that before use, the collection pipe 10 is snap-connected inside the pipe sleeve 5, and then the can lid 2 is installed on the top of the bottom case 1. During the process, when the sliding gasket 13 contacts the connecting head 14, it will be squeezed and move upward, so that the inside of the collection pipe 10 is communicated with the inside of the connecting head 14. After floating to the water surface, the can lid 2 is opened, driving the pipe sleeve 5 and the sealing gasket 7 to move upward. During the process, the water at the target depth remaining in the adjusting plate 171, the hose 15, and the connecting head 14 will be sucked out, thus avoiding the interference of the residual water sample in the hose 15 and the connecting head 14 on the subsequent water body sampling, and further ensuring the accuracy of the sampling.

[0027] Among them, the upper end of the adjusting plate 171 is communicated with the hose 15. The adjusting plate 171 is slidably connected to the installation cavity 16. The adjusting rod 174 is rotatably connected to the bottom case 1. The fixing rod 175 is fixedly connected to the bottom case 1. The sealing plate 176 is slidably connected to the bottom case 1. The lower surface of the sealing plate 176 contacts the rectangular plate 20. The opening direction of the one-way valve 173 is from the rectangular cavity 18 to the inside of the collection pipe 10. Both rotating plates 221 are rotatably connected to the bottom case 1. The permanent magnet 224 is located on one side of the electromagnet 223. The two rotating plates 221 are symmetrically arranged. Its function is to drive the adjusting plate 171 to move inward or outward by rotating the adjusting rod 174, so that the limiting block 177 moves with the adjusting plate 171, and the position of the through hole 172 is adjusted. When the position of the through hole 172 is adjusted to the position corresponding to the sampling depth, stop moving. When performing multiple samplings at the same depth, all the adjusting plates 171 are adjusted to the same position. When performing a single sampling at different depths, the multiple adjusting plates 171 are adjusted to the corresponding positions of the different depths required for sampling, so that multiple samplings at the same depth or single samplings at different depths can be simply and conveniently completed.

[0028] Working principle:

[0029] Before using the present invention, the collecting tube 10 is snap-fitted inside the tube sleeve 5, and then the can lid 2 is installed on the top of the bottom case 1. During this process, when the sliding pad 13 contacts the connector 14, it will be squeezed and move upward, so that the inside of the collecting tube 10 is communicated with the inside of the connector 14. The sector holes 222 on the two rotating plates 221 coincide. At this time, the electromagnets 223 on the upper and lower sides are in contact with each other. The sealing gasket 7 contacts the bottom of the collecting tube 10, and the exhaust valve 9 is opened. The gas cylinder 8 replenishes an appropriate amount of gas into the inside of the bottom case 1, but does not cause the snap lid 3 to separate from the can lid 2. Then the exhaust valve 9 is closed;

[0030] Before using the present invention, rotate the adjusting rod 174 to drive the adjusting plate 171 to move inward or outward, so that the limiting block 177 moves with the adjusting plate 171, and the position of the through hole 172 inside the adjusting plate 171 is adjusted. When the adjusting plate 171 is adjusted to the position corresponding to the sampling depth, stop moving. When performing multiple samplings at the same depth, all the adjusting plates 171 are adjusted to the same position. When performing single samplings at different depths, the multiple adjusting plates 171 are adjusted to the corresponding positions of the different depths required for sampling;

[0031] Subsequently, when the present invention is placed in water, the present invention will slowly sink to the bottom of the water. According to the direct linear relationship between the water depth and the water pressure, that is, as the depth increases, the water pressure also increases. The water pressure will push the rectangular plate 20 to move inward along the sliding rod 19 and squeeze the compression spring 21. During this process, water will enter the inside of the rectangular cavity 18 outside the rectangular plate 20. The greater the water pressure, the greater the pressure to squeeze the compression spring 21. According to Hooke's law, within a certain range of an elastic material, its deformation is proportional to the acting force. That is, within the working range of the compression spring 21, there is a linear relationship between the compression amount and the applied force;

[0032] When approaching the sampling depth, the electromagnets 223 above and below are energized, and a repulsive force that repels the electromagnet 223 of the other party is generated between them. At the same time, the lower electromagnet 223 will attract the upper permanent magnet 224, and the upper electromagnet 223 will attract the lower permanent magnet 224, thereby driving the two rotating plates 221 to be misaligned, so that the sector holes 222 above and below no longer coincide, thereby increasing the resistance to the sinking of the present device. At the same time, the gas inside the bottom case 1 is ejected downward from the nozzle 23, so that the sinking speed of the present invention will become slow until the present invention is in a suspended state at the target depth. During this process, the exhaust valve 9 will be opened to continuously replenish gas into the inside of the bottom case 1;

[0033] After reaching the sampling depth, the rectangular plate 20 will come into contact with the limit block 177. At this time, the water pressure will open the one-way valve 173, and the water at the target depth will quickly enter the through hole 172, the hose 15, the connector 14, and finally enter the inside of the collection tube 10. The gasket 7 will lift upward according to the volume of water entering the inside of the collection tube 10 until the protrusion of the sleeve 5 contacts the lower surface of the tank cover 2. During this process, for every volume of water entering the inside of the collection tube 10, the sleeve 5 will protrude upward by the corresponding volume, so as to keep the buoyancy of the present invention unchanged during the sampling process, thus completing the accurate sampling of the target depth;

[0034] After the sampling at the target depth is completed, the electromagnets 223 above and below are reversely energized, and a repulsive force that attracts each other's electromagnets 223 is generated between them. At the same time, the lower electromagnet 223 will repel the upper permanent magnet 224, and the upper electromagnet 223 will repel the lower permanent magnet 224, thereby driving the two rotating plates 221 to completely overlap, and the nozzle 23 stops jetting downward, reducing the resistance when the present invention sinks. The present invention will continue to sink, and the above steps will be repeated when reaching the next sampling depth;

[0035] When the sampling at the deepest depth is completed or the device reaches the bottom of the water, the exhaust valve 9 is opened, and the gas inside the gas tank 8 is discharged, so that the gas pressure in the internal space of the bottom shell 1 slowly increases, which will cause the snap-on lid 3 to separate from the tank cover 2 and take out the compression airbag 4. The gas discharged from the gas tank 8 will enter the compression airbag 4, thereby increasing the buoyancy of the present device and realizing rapid floating. Finally, it floats out of the water surface. Open the tank cover 2, drive the sleeve 5 and the gasket 7 to move upward. During this process, the water at the target depth remaining in the adjusting plate 171, the hose 15, and the connector 14 will be sucked out, and then drive the collection tube 10 to move upward, so as to be taken out. Then separate the sleeve 5 from the collection tube 10, thus completing the sampling.

[0036] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0037] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A sampling device for water quality detection, comprising a bottom shell (1), and a tank cover (2) is movably installed on the upper surface of the bottom shell (1), characterized in that: A lid (3) is snap-connected to the middle of the upper surface of the can lid (2). A compression airbag (4) is fixedly connected to the lower surface of the lid (3). A plurality of pipe sleeves (5) are slidably connected to the middle of the can lid (2). A connecting rod (6) is fixedly connected to the inside of the pipe sleeve (5). A sealing gasket (7) is fixedly connected to the lower end of the connecting rod (6). An air tank (8) is fixedly installed at the center of the bottom of the bottom shell (1). An exhaust valve (9) is fixedly installed at the upper end of the air tank (8). A plurality of collecting pipes (10) are arranged inside the bottom shell (1). A connecting sleeve (11) is fixedly connected to the bottom of the collecting pipe (10). A return spring (12) is fixedly connected to the top end inside the connecting sleeve (11). A sliding gasket (13) is fixedly connected to the bottom end of the return spring (12). A connecting head (14) is arranged directly below the connecting sleeve (11). A hose (15) is fixedly connected to the lower end of the connecting head (14). An installation cavity (16) is formed below the hose (15). An adjusting mechanism (17) is arranged inside the installation cavity (16). A rectangular cavity (18) is formed below the adjusting mechanism (17). A sliding rod (19) is fixedly connected to the inner side of the rectangular cavity (18). A rectangular plate (20) is slidably connected to the outer end of the sliding rod (19). A compression spring (21) is fixedly connected between the rectangular plate (20) and the inner wall of the rectangular cavity (18). A rotating mechanism (22) is rotatably installed on the curved surface of the bottom shell (1). A plurality of nozzles (23) are fixedly installed on the curved surface of the bottom shell (1). The rotating mechanism (22) includes two rotating plates (221). A plurality of sector holes (222) are formed in the middle of the rotating plate (221). A plurality of electromagnets (223) and a plurality of permanent magnets (224) are fixedly connected to the edge of the rotating plate (221); Both of the two rotating plates (221) are rotatably connected to the bottom shell (1). The permanent magnet (224) is located on one side of the electromagnet (223). The two rotating plates (221) are arranged symmetrically up and down; When the sampling depth is about to be reached, the electromagnets (223) above and below are energized, and a repulsive force that repels the electromagnets (223) of each other is generated between them. At the same time, the lower electromagnet (223) will attract the upper permanent magnet (224), and the upper electromagnet (223) will attract the lower permanent magnet (224), thereby driving the two rotating plates (221) to be misaligned, so that the sector holes (222) above and below no longer coincide, thereby increasing the resistance to sinking.

2. The sampling device for water quality detection according to claim 1, wherein: The adjusting mechanism (17) includes an adjusting plate (171). A through hole (172) is formed in the middle of the adjusting plate (171). A one-way valve (173) is fixedly installed at the bottom of the through hole (172). An adjusting rod (174) is threadedly connected to one side of the adjusting plate (171). A fixing rod (175) is slidably connected to the other side of the adjusting plate (171). A sealing plate (176) is fixedly connected to the lower end of the adjusting plate (171). A limiting block (177) is fixedly connected to the lower surface of the sealing plate (176).

3. The sampling device for water quality detection according to claim 2, wherein: The lower end of the compression airbag (4) is fixedly connected to the tank cover (2). The compression airbag (4) is annular. A protrusion is provided inside the pipe sleeve (5). A groove is formed in the lower surface of the sealing gasket (7). The sealing gasket (7) is adapted to the collecting pipe (10). The sliding gasket (13) is slidably connected to the connecting sleeve (11). The connecting head (14) is fixedly connected to the bottom shell (1). The rectangular plate (20) is adapted to the rectangular cavity (18) and has good sealing performance. An appropriate amount of compressed gas is filled inside the gas tank (8). The nozzle (23) is communicated with the inside of the bottom shell (1). The pipe sleeve (5) is snap-connected to the collecting pipe (10).

4. The sampling device for water quality detection according to claim 3, characterized in that: The upper end of the adjusting plate (171) is communicated with the hose (15). The adjusting plate (171) is slidably connected to the installation cavity (16). The adjusting rod (174) is rotatably connected to the bottom shell (1). The fixing rod (175) is fixedly connected to the bottom shell (1). The sealing plate (176) is slidably connected to the bottom shell (1). The lower surface of the sealing plate (176) contacts the rectangular plate (20). The opening direction of the one-way valve (173) is from the rectangular cavity (18) to the inside of the collecting pipe (10).

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