A stratified water extraction device for water quality testing

Abstract

The present invention discloses a stratified water sampling device for water quality testing, which belongs to the field of environmental monitoring and includes a mother chamber and a sampling device. The mother chamber includes an installation chamber and a pressure chamber. The installation chamber is arranged on the top of the pressure chamber, and the top of the installation chamber is open. The sampling device is arranged in the installation chamber. The sampling device includes a collecting bottle and an opening and closing mechanism, and the opening and closing mechanism is slidably arranged in the collecting bottle. The present invention can more accurately perform fixed-depth stratified sampling of water bodies, and can cope with various water body conditions by adjusting the water pressure. According to needs, multiple devices of the present invention can be bundled and centrally released through external equipment. A single release can complete the sampling of multi-layer water bodies, which is more efficient. In addition, the split design of the collecting bottle makes it easier to take and transport after sampling is completed.

Description

Technical Field

[0001] The invention belongs to the technical field of environmental monitoring, and in particular relates to a stratified water intake device for water quality detection. Background Art

[0002] When conducting water quality testing, it is often necessary to sample and test the water. The physical, chemical and microbial components of water at different depths are different. Stratified water sampling can more comprehensively reflect the true condition of water quality, which is especially important for deep lakes, reservoirs, oceans and other water bodies. Ignoring stratification may lead to missed pollution or misjudgment of ecological risks. Therefore, in order to obtain water quality information more accurately, it is necessary to conduct stratified sampling and testing of water at different depths when sampling.

[0003] Some existing fixed-depth water extractors often control the diving depth of the water extractor through a float and a traction rope, observe the diving distance of the water extractor through the traction rope, and when the target water depth is reached, the traction rope pulls the trigger to control the water extractor to take samples. Although this type of fixed-depth water extractor has a simple structure and is easy to operate, when facing a water source with strong fluidity, the water extractor may deviate during the diving process, and the traction rope cannot be extended in the vertical direction, resulting in the actual diving distance of the water extractor not matching the extended length of the traction rope, resulting in inaccurate samples. At the same time, this type of fixed-depth water extractor can only be used for one water extraction with a set of floats and traction ropes. If you want to take multiple layers of samples, you can only place the water extractors separately. Moreover, since the traction ropes are easily entangled in the water, they cannot be placed in a centralized manner, which is more inconvenient. Summary of the Invention

[0004] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a stratified water sampling device for water quality testing, which can more accurately sample water at a fixed depth and can also be put into centralized storage, resulting in higher sampling efficiency.

[0005] The technical solution adopted by the present invention is as follows: The present invention provides a stratified water sampling device for water quality testing, including a mother chamber and a sampling device, the mother chamber including an installation chamber and a pressure chamber, the installation chamber is arranged at the top of the pressure chamber, the top of the installation chamber is open, the sampling device is arranged in the installation chamber, the sampling device includes a collecting bottle and an opening and closing mechanism, and the opening and closing mechanism is slidably arranged in the collecting bottle.

[0006] Furthermore, the installation bin includes a cylinder body, an inductive slide groove, a piston rod and a spring. The top of the cylinder body is open, the inductive slide groove is symmetrically opened on one side wall of the cylinder body, the top of the inductive slide groove is open, the piston rod is slidably arranged in the inductive slide groove, the piston rod is in contact with the inner wall of the inductive slide groove, and the spring is arranged between the bottom wall of the inductive slide groove and the piston rod.

[0007] Furthermore, the pressure chamber includes a second cylinder, an externally threaded cylinder, a handle, a screw and an adjusting piston. The second cylinder is arranged below the first cylinder, the externally threaded cylinder is rotatably arranged on the bottom wall of the second cylinder, the handle is arranged at the bottom of the second cylinder, the handle is transmission-connected to the externally threaded cylinder, the screw is rotatably arranged in the externally threaded cylinder, the screw is threadably engaged with the externally threaded cylinder, the adjusting piston is arranged at the top of the screw, the adjusting piston is slidingly clamped in the second cylinder, and the adjusting piston cannot rotate in the second cylinder.

[0008] Furthermore, a partition is provided between the cylinder body 1 and the cylinder body 2, the partition separates the cylinder body 1 and the cylinder body 2, and a connecting port is opened at the bottom end of the side wall of the induction chute, and the connecting port connects the induction chute and the cylinder body 2.

[0009] Furthermore, a top wall of the cylinder is provided with an elastic plate in a circumferential array, and a latching tooth is provided on one side of the top of the elastic plate close to the center of the central cylinder.

[0010] Wherein, a pressure gauge is provided on the outer wall of the second cylinder, and the pressure gauge can display the air pressure inside the second cylinder.

[0011] Furthermore, the collecting bottle includes a bottle body, an adjustment opening, a drain outlet, a reserved groove and a two-stage button. The bottle body is arranged in the cylinder body, the adjustment opening is symmetrically opened on the side wall of the bottle body, the drain outlet is opened on the top of the bottle body, the reserved groove is opened on the bottom wall of the adjustment opening, and the two-stage button is arranged in the reserved groove. The two-stage button can be switched between extended and contracted states by pressing.

[0012] Furthermore, a water inlet is provided on the side wall of the bottle body, and a bottle stopper is inserted into the drain outlet.

[0013] Preferably, the water inlet and the regulating opening have the same height, and the heights of the water inlet and the regulating opening are higher than the height of a top edge of the cylinder.

[0014] Furthermore, the opening and closing mechanism includes an annular plate, a float, a center platform, a connecting line, an extension plate, a sleeve, an extension rod and a second piston rod, the annular plate is slidably arranged in the bottle body, the outer wall of the annular plate is in contact with the inner wall of the bottle, the height of the annular plate is the same as the height of the water inlet and the adjusting opening, the float is arranged on the inner side of the annular plate, the center platform is arranged on the top of the float, the connecting line is arranged between the center platform and the inner wall of the annular plate, the extension plate is symmetrically arranged on both sides of the annular plate, the extension plate extends to the outside of the bottle body through the adjusting opening, the sleeve is arranged at the bottom of the extension plate, the bottom of the sleeve is open, the sleeve is slidably arranged in the reserved groove, the sleeve is sleeved on the outside of the two-stage button, the extension rod is arranged at the bottom of the extension plate, the extension rod is arranged on the side of the sleeve away from the annular plate, the second piston rod is arranged at the bottom of the extension rod, the second piston rod is slidably arranged in the sensing slide groove, the second piston rod is in contact with the inner wall of the sensing slide groove, and the second piston rod is arranged above the first piston rod.

[0015] Preferably, the two bottom ends of the piston rod, the top end of the piston rod, the bottom end of the bottle stopper and the top wall of the center platform are respectively provided with magnetic buckles.

[0016] In the initial state, the two-stage button is in an extended state, the top wall of the extension plate fits the top wall of the adjustment opening, the piston rod one is in contact with the piston rod two, and the height of the piston rod two is lower than the height of the top edge of the sensing slide groove. The spring is only used to assist the piston rod one to fit upward with the piston rod two in the preparation stage. The spring has low elasticity, and the two-stage button has low elasticity.

[0017] The beneficial effects achieved by the present invention using the above structure are as follows: This solution provides a stratified water extraction device for water quality testing. After the collection bottle is installed in the installation bin, the extension plate is pressed downward, and the top wall of the sleeve is pressed downward on the two-stage button to switch the two-stage button to the retracted state. According to the water pressure at the target depth, the handle is turned to adjust the position of the piston, thereby adjusting the air pressure in the cylinder body 2 to make it slightly smaller than the water pressure at the target depth. It can then be connected and launched through an external device. After reaching the set depth, as the device continues to dive, the water pressure gradually exceeds the set pressure in the pressure bin, and the water pressure begins to push the piston rod 2 and the piston rod 1 downward to compress the space in the cylinder body 1, while driving the annular plate downward to stagger it with the water inlet and the adjustment opening. The surrounding water enters the bottle body, and as it continues Continue to dive, press the two-stage button on the top wall of the cylinder again to make it rebound, and at the same time the water level in the bottle rises, the float floats up, the top wall of the center platform and the bottom wall of the bottle stopper are magnetically fixed, the annular plate moves up to seal the drain outlet and the adjustment opening and is fixed to complete the sampling. This method can more accurately sample the water body at a fixed depth, and the adjustment method based on the water pressure can cope with a variety of water conditions. According to needs, multiple devices of the present invention can be bundled and concentratedly released through external equipment, and the sampling of multiple layers of water bodies can be completed with a single release, which is more efficient. The magnetic fixation of the top wall of the center platform and the bottom wall of the bottle stopper can prevent the annular plate of the shallow water sampling equipment from reopening when the remaining equipment continues to dive during concentrated release, and the split design of the collecting bottle is more convenient for taking and transporting after the sampling is completed. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic structural diagram of a stratified water extraction device for water quality testing provided by the present invention;

[0019] Figure 2 A schematic structural diagram of the mother compartment provided by the present invention;

[0020] Figure 3 A cross-sectional view of the mother chamber provided by the present invention;

[0021] Figure 4 A schematic structural diagram of the sampling device provided by the present invention;

[0022] Figure 5 A schematic structural diagram of the collecting bottle provided by the present invention;

[0023] Figure 6 A cross-sectional view of the collecting bottle provided by the present invention;

[0024] Figure 7 A schematic structural diagram of the opening and closing mechanism provided by the present invention;

[0025] Figure 8 This is a cross-sectional view of a stratified water intake device for water quality testing provided by the present invention.

[0026] Among them, 1. mother chamber, 2. sampling device, 3. installation chamber, 4. pressure chamber, 5. collecting bottle, 6. opening and closing mechanism, 301. cylinder body one, 302. elastic plate, 303. latching tooth, 304. induction slide, 305. piston rod one, 306. spring, 307. connecting port, 308. partition, 401. cylinder body two, 402. external threaded cylinder, 403. handle, 404. screw, 405. adjusting piston, 406. pressure gauge, 501. bottle body, 502. adjusting opening, 503. water inlet, 504. drain outlet, 505. bottle stopper, 506. reserved groove, 507. two-stage button, 601. annular plate, 602. float, 603. center platform, 604. connecting line, 605. extension plate, 606. sleeve, 607, extension rod, 608. piston rod two.

[0027] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0029] In the description of the present invention, it should be understood that terms such as "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limiting the present invention.

[0030] like Figures 1-8 As shown, the present invention provides a stratified water sampling device for water quality testing, including a mother chamber 1 and a sampling device 2. The mother chamber 1 includes an installation chamber 3 and a pressure chamber 4. The installation chamber 3 is arranged on the top of the pressure chamber 4. The top of the installation chamber 3 is open. The sampling device 2 is arranged in the installation chamber 3. The sampling device 2 includes a collecting bottle 5 and an opening and closing mechanism 6. The opening and closing mechanism 6 is slidably arranged in the collecting bottle 5.

[0031] Furthermore, the mounting chamber 3 includes a cylinder 301, an inductive slide 304, a piston rod 305 and a spring 306. The top of the cylinder 301 is open, the inductive slide 304 is symmetrically opened on the side wall of the cylinder 301, the top of the inductive slide 304 is open, the piston rod 305 is slidably arranged in the inductive slide 304, the piston rod 305 is in contact with the inner wall of the inductive slide 304, and the spring 306 is arranged between the bottom wall of the inductive slide 304 and the piston rod 305.

[0032] Furthermore, the pressure chamber 4 includes a cylinder body 2 401, an externally threaded cylinder 402, a handle 403, a screw 404 and an adjusting piston 405. The cylinder body 2 401 is arranged below the cylinder body 1 301, the externally threaded cylinder 402 is rotatably arranged on the bottom wall of the cylinder body 2 401, the handle 403 is arranged at the bottom of the cylinder body 2 401, the handle 403 is transmission-connected to the externally threaded cylinder 402, the screw 404 is rotatably arranged in the externally threaded cylinder 402, the screw 404 is threadedly engaged with the externally threaded cylinder 402, the adjusting piston 405 is arranged at the top of the screw 404, the adjusting piston 405 is slidably clamped in the cylinder body 2 401, and the adjusting piston 405 cannot rotate in the cylinder body 2 401.

[0033] Furthermore, a partition 308 is provided between the cylinder 1 301 and the cylinder 2 401 , and the partition 308 separates the cylinder 1 301 and the cylinder 2 401 . A connecting port 307 is provided at the bottom end of the side wall of the sensing chute 304 , and the connecting port 307 connects the sensing chute 304 and the cylinder 2 401 .

[0034] Furthermore, an elastic plate 302 is provided in a circumferential array on the top wall of the cylinder 1 301 , and a latching tooth 303 is provided on one side of the top of the elastic plate 302 close to the center of the central cylinder.

[0035] A pressure gauge 406 is provided on the outer wall of the second cylinder 401 , and the pressure gauge 406 can display the air pressure inside the second cylinder 401 .

[0036] Furthermore, the collecting bottle 5 includes a bottle body 501, an adjustment opening 502, a drain outlet 504, a reserved groove 506 and a two-stage button 507. The bottle body 501 is arranged in the cylinder 301, the adjustment opening 502 is symmetrically opened on the side wall of the bottle body 501, the drain outlet 504 is opened on the top of the bottle body 501, the reserved groove 506 is opened on the bottom wall of the adjustment opening 502, and the two-stage button 507 is arranged in the reserved groove 506. The two-stage button 507 can be switched between the extended and contracted states by pressing.

[0037] Furthermore, a water inlet 503 is provided on the side wall of the bottle body 501 , and a bottle stopper 505 is inserted into the drain outlet 504 .

[0038] Preferably, the water inlet 503 and the regulating opening 502 have the same height, and the heights of the water inlet 503 and the regulating opening 502 are higher than the height of the top edge of the cylinder 301 .

[0039] Furthermore, the opening and closing mechanism 6 includes an annular plate 601, a float 602, a center platform 603, a connecting line 604, an extension plate 605, a sleeve 606, an extension rod 607 and a piston rod 2 608. The annular plate 601 is slidably arranged in the bottle body 501, the outer wall of the annular plate 601 is in contact with the inner wall of the bottle body 501, the height of the annular plate 601 is the same as the height of the water inlet 503 and the adjustment opening 502, the float 602 is arranged on the inner side of the annular plate 601, the center platform 603 is arranged on the top of the float 602, the connecting line 604 is arranged between the center platform 603 and the inner wall of the annular plate 601, and the extension plate 605 is symmetrically arranged on both sides of the annular plate 601. On the other hand, the extension plate 605 extends through the adjustment opening 502 to the outside of the bottle body 501, the sleeve 606 is arranged at the bottom of the extension plate 605, the bottom of the sleeve 606 is open, the sleeve 606 is slidably arranged in the reserved groove 506, the sleeve 606 is sleeved on the outside of the two-stage button 507, the extension rod 607 is arranged at the bottom of the extension plate 605, the extension rod 607 is arranged on the side of the sleeve 606 away from the annular plate 601, the piston rod 2 608 is arranged at the bottom of the extension rod 607, the piston rod 2 608 is slidably arranged in the sensing slide groove 304, the piston rod 2 608 is in contact with the inner wall of the sensing slide groove 304, and the piston rod 2 608 is arranged above the piston rod 1 305.

[0040] Preferably, the bottom end of piston rod 2 608, the top end of piston rod 1 305, the bottom end of bottle stopper 505 and the top wall of center platform 603 are respectively provided with magnetic buckles.

[0041] In the initial state, the two-stage button 507 is in an extended state, the top wall of the extension plate 605 fits the top wall of the adjustment opening 502, the piston rod 1 305 is in contact with the piston rod 2 608, and the height of the piston rod 2 608 is lower than the height of the top edge of the sensing slide 304. Among them, the spring 306 is only used to assist the piston rod 1 305 to fit upward with the piston rod 2 608 in the preparation stage. The spring 306 has low elasticity, and the two-stage button 507 has low elasticity.

[0042] When in use, first put the collecting bottle 5 into the installation chamber 3 from between the elastic plates 302. After the collecting bottle 5 is completely put in, the elastic plate 302 rebounds, and the latching teeth 303 are stuck on the top surface of the collecting bottle 5 to install and fix it. Then, press the extension plate 605 downwards, and press the two-stage button 507 downwards on the top wall of the sleeve 606 to switch the two-stage button 507 to the retracted state. According to the water pressure of the current target collection depth of the device, turn the handle 403 to adjust the position of the piston 405 and adjust the space between the piston and the top wall of the cylinder 401, thereby adjusting the air pressure in the cylinder 401 to be slightly smaller than the target water pressure. The water pressure of the standard depth, under the action of the pressure of the air pressure and the elastic force of the spring 306, the piston rod 1 305 pushes the piston rod 2 608 upward to the initial state position, the annular plate 601 blocks the adjustment opening 502 and the water inlet 503, and then the present invention can be connected through an external device and put into a vertical state. If it is necessary to collect samples of different depths at the current position at the same time, multiple present inventions can be bundled and connected through an external device and then put into use; after reaching the set depth, as the device continues to dive, the water pressure gradually exceeds the set pressure in the pressure chamber 4, and the water pressure begins to push the piston rod 2 608 and the piston rod 1 305 to The space in the cylinder 1 301 is compressed downward, and at the same time, the annular plate 601 is driven downward to stagger it with the water inlet 503 and the regulating opening 502, and the surrounding water enters the bottle body 501. As it continues to dive, the water pressure continues to increase, and the difference between the water pressure and the preset pressure in the cylinder 2 401 increases. The greater the difference, the longer the distance that the piston 2 and the piston move downward, until the top wall of the cylinder presses the two-stage button 507 again to make it rebound. At the same time, the water level in the bottle rises, the float 602 floats up and pulls the annular plate 601, the top wall of the center platform 603 is magnetically fixed to the bottom wall of the bottle stopper 505, and the connecting line 604 pulls the annular plate 601 prevents it from moving downward, and the annular plate 601 moves up to block the drain outlet 504 and the regulating opening 502 and fixes them to complete the sampling of the current water depth; during centralized deployment, after the current water depth sampling is completed, the operator controls the continued diving above the water surface. As the present invention dives, samples are taken in order from small to large according to the preset pressure in the cylinder 401. The present invention that has completed sampling will not cause the annular plate 601 to move down again as the water pressure increases due to the elastic force of the two-stage button 507 and the magnetic fixation between the top wall of the center platform 603 and the bottom wall of the bottle stopper 505. After the sampling is completed, the present invention can be pulled out of the water.

[0043] It should be noted that, in this document, relational terms such as first and second, etc., are used only 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 "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0044] The present invention and its embodiments are described above. This description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if a person skilled in the art is inspired by this and, without departing from the purpose of the present invention, designs structures and embodiments similar to this technical solution without inventiveness, they shall fall within the scope of protection of the present invention.

Claims

1. A stratified water extraction device for water quality testing, characterized by: The invention comprises a mother chamber (1) and a sampling device (2), wherein the mother chamber (1) comprises an installation chamber (3) and a pressure chamber (4), wherein the installation chamber (3) is arranged on the top of the pressure chamber (4), and the top of the installation chamber (3) is open, and the sampling device (2) is arranged in the installation chamber (3), and the sampling device (2) comprises a collecting bottle (5) and an opening and closing mechanism (6), wherein the opening and closing mechanism (6) is slidably arranged in the collecting bottle (5), and the installation chamber (3) comprises a cylinder (301), an induction chute (304), and a plurality of openings and closings. ), piston rod one (305) and spring (306), the cylinder one (301) is open at the top, the sensing chute (304) is symmetrically opened on the side wall of the cylinder one (301), the sensing chute (304) is open at the top, the piston rod one (305) is slidably arranged in the sensing chute (304), the piston rod one (305) is fitted with the inner wall of the sensing chute (304), and the spring (306) is arranged between the bottom wall of the sensing chute (304) and the piston rod one (305); The collecting bottle (5) comprises a bottle body (501), an adjusting opening (502), a drain outlet (504), a reserved groove (506) and a two-stage button (507); the bottle body (501) is arranged in the first cylinder (301); the adjusting opening (502) is symmetrically opened on the side wall of the bottle body (501); the drain outlet (504) is opened on the top of the bottle body (501); the reserved groove (506) is opened on the bottom wall of the adjusting opening (502); and the two-stage button (507) is arranged in the reserved groove (506); The opening and closing mechanism (6) includes an annular plate (601), a float (602), a center platform (603), a connecting line (604), an extension plate (605), a sleeve (606), an extension rod (607) and a second piston rod (608). The annular plate (601) is slidably arranged in the bottle body (501). The outer wall of the annular plate (601) is in contact with the inner wall of the bottle body (501). The height of the annular plate (601) is the same as that of the water inlet (503) and the regulating opening (502). The float (602) is arranged on the inner side of the annular plate (601). The center platform (603) is arranged on the top of the float (602). The connecting line (604) is arranged between the center platform (603) and the inner wall of the annular plate (601). The extension plate (605) is symmetrically arranged on both sides of the annular plate (601). The extension plate (605) extends toward the outside of the bottle body (501) through the adjustment opening (502), the sleeve (606) is provided at the bottom of the extension plate (605), the bottom of the sleeve (606) is open, the sleeve (606) is slidably provided in the reserved groove (506), the sleeve (606) is sleeved on the outside of the two-stage button (507), the extension rod (607) is provided at the bottom of the extension plate (605), the extension rod (607) is provided on the side of the sleeve (606) away from the annular plate (601), the piston rod 2 (608) is provided at the bottom of the extension rod (607), the piston rod 2 (608) is slidably provided in the sensing slide groove (304), the piston rod 2 (608) is in contact with the inner wall of the sensing slide groove (304), and the piston rod 2 (608) is provided above the piston rod 1 (305).

2. A stratified water extraction device for water quality testing according to claim 1, characterized in that: A water inlet (503) is provided on the side wall of the bottle body (501), a bottle stopper (505) is inserted into the drain outlet (504), the water inlet (503) and the regulating opening (502) are at the same height, and the heights of the water inlet (503) and the regulating opening (502) are higher than the height of the top edge of the cylinder body (301).

3. The stratified water extraction device for water quality testing according to claim 2, characterized in that: The pressure chamber (4) comprises a second cylinder (401), an externally threaded cylinder (402), a handle (403), a screw (404) and an adjusting piston (405), wherein the second cylinder (401) is arranged below the first cylinder (301), the externally threaded cylinder (402) is rotatably arranged on the bottom wall of the second cylinder (401), the handle (403) is arranged at the bottom of the second cylinder (401), the handle (403) is transmission-connected with the externally threaded cylinder (402), the screw (404) is rotatably arranged in the externally threaded cylinder (402), the screw (404) is threadedly engaged with the externally threaded cylinder (402), the adjusting piston (405) is arranged at the top end of the screw (404), the adjusting piston (405) is slidably clamped in the second cylinder (401), and the adjusting piston (405) cannot rotate in the second cylinder (401).

4. The stratified water extraction device for water quality testing according to claim 3, characterized in that: A partition (308) is provided between the cylinder body 1 (301) and the cylinder body 2 (401), and the partition (308) separates the cylinder body 1 (301) and the cylinder body 2 (401). A connecting port (307) is provided at the bottom end of the side wall of the sensing chute (304), and the connecting port (307) connects the sensing chute (304) and the cylinder body 2 (401).

5. The stratified water extraction device for water quality testing according to claim 4, characterized in that: The top wall of the cylinder (301) is provided with an elastic plate (302) in a circumferential array, and the top of the elastic plate (302) is provided with a latching tooth (303) on one side close to the center of the central cylinder.

6. The stratified water extraction device for water quality testing according to claim 5, characterized in that: A pressure gauge (406) is provided on the outer wall of the second cylinder (401).

7. A stratified water extraction device for water quality testing according to claim 6, characterized in that: The bottom end of the second piston rod (608), the top end of the first piston rod (305), the bottom end of the bottle stopper (505) and the top wall of the center platform (603) are respectively provided with magnetic buckles.

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