Water quality detection water sampler

Abstract

The invention relates to the technical field of water quality sampling devices, and discloses a water quality detection water sampler which comprises a liquid storage bottle, one side of the liquid storage bottle is fixedly connected with a balancing weight, the top of the balancing weight is fixedly connected with a lifting rope, the bottom of the liquid storage bottle is provided with a water inlet, and the top of the balancing weight is fixedly connected with a main pipe. The pressure difference between gas and a water body is changed through gas inflation and gas exhaust in the liquid storage bottle, sampling is performed under the action of water pressure, meanwhile, the adjusting mechanism is matched to drive the arc-shaped plates to be attached to the filter cartridge and close filter holes of the filter cartridge according to the pressure difference, and the speed of a target water body entering the liquid storage bottle is adjusted; gas in the gas cavity is pumped out through the branch pipe and the main pipe, sample introduction is completed under the condition that disturbance of a water body at a target layer is not likely to be caused, and when the water sampler moves in the water body, a channel of the water inlet and the liquid storage bottle are both in a sealed state, so that cross pollution caused by driving water bodies at other positions to the target layer is avoided; and the use reliability of the water sampler is improved.

Description

Technical Field

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

[0002] In the process of detecting the water quality of rivers and lakes, it is necessary to use a water quality sampling device to take water samples from the water body, and then detect the water quality of the taken water samples. Usually, when detecting the water quality in a region, multiple sampling positions need to be arranged, and a single sampling position needs to take samples at sampling points at different depths. The existing water quality sampling devices usually include several water storage bottles, and counterweights are arranged between the several water storage bottles. During use, the lifting rope is released, and the position of the water storage bottle is determined by the length of the released lifting rope. When reaching the sampling point, an operator controls the driving mechanism to open the opening and the exhaust port of the corresponding water storage bottle, so that the water sample at the target layer enters the interior of the water storage bottle to complete the sampling, and then controls the driving mechanism to close the opening and the exhaust hole and then lift the water storage bottle to complete the sampling.

[0003] However, during the sampling process of the traditional water quality sampling device, the gas in the water storage bottle is discharged in the water body, disturbing the water body at the target layer, and easily causing changes in components with weak stability such as some volatile substances in the target water body. Even if a stabilizer is filled into the sample after the sampling is completed, it is difficult to avoid the inaccuracy of subsequent component detection caused by the sampling error. And some water quality sampling devices adopt an open type opening, and the opening is already open during the release process of the sampling device. Although the disturbance degree to the water body at the target layer is small, it will bring the water samples at other layers to the target layer, easily causing cross-contamination of the water samples and affecting the accuracy of the detection results. Summary of the Invention

[0004] In view of the deficiencies existing in the existing water quality sampling devices during use as mentioned in the background art, the present invention provides a water quality detection water sampler, which has the advantages of not easily disturbing the target water body during sampling and avoiding cross-contamination of water bodies at different positions, and solves the technical problems mentioned in the above background art.

[0005] The present invention provides the following technical solution: A water quality detection water sampler includes a liquid storage bottle, one side of the liquid storage bottle is fixedly connected with a counterweight, the top of the counterweight is fixedly connected with a lifting rope, the bottom of the liquid storage bottle is provided with a water inlet, the top of the counterweight is fixedly connected with a main pipe, the top of the liquid storage bottle is fixedly connected with a branch pipe communicated with the main pipe, one end of the main pipe is connected with a pneumatic control device, a sliding plug is slidably sleeved inside the liquid storage bottle, and the sliding plug divides the water storage cavity into a gas cavity at the top and a water storage cavity at the bottom, and a solenoid valve is fixedly arranged on the body of the branch pipe.

[0006] The bottom of the liquid storage bottle is fixedly connected with a filter cylinder. A plurality of filter holes are formed in the side wall of the filter cylinder. An arc-shaped plate for closing the filter holes is arranged outside the filter cylinder. A sealing block for closing the water inlet is arranged at the bottom of the liquid storage bottle. An adjusting mechanism is arranged at the bottom of the liquid storage bottle. The adjusting mechanism can adjust the number of filter holes blocked by the arc-shaped plate according to the pressure difference between the gas cavity pressure and the water pressure, and adjust the flow rate of the water body passing through the filter cylinder. The adjusting mechanism can cooperate with the sliding plug to adjust the position of the sealing block, and use the pressure difference between the gas cavity and the water pressure to drive the sealing block to move to seal the water inlet during sample injection.

[0007] Preferably, the number of the liquid storage bottles is set to be several, and the arc-shaped plate is in an arc shape adapted to the annular outer wall of the filter cylinder.

[0008] Preferably, the adjusting mechanism includes a liquid blocking block. The liquid blocking block is slidably sleeved with the sliding plug. A spring seat is fixedly arranged at the midpoint of the top of the sliding plug. A first spring for pushing the liquid blocking block to extend out of the sliding plug is fixedly connected to the bottom of the spring seat.

[0009] The inner side of the liquid blocking block is slidably sleeved with a connecting rod. The connecting rod is fixedly connected with the sealing block. A regulating block is fixedly connected to the bottom of the sealing block. A second spring for keeping the sealing block extending out of the water inlet is fixedly connected to the top of the regulating block. A blocking block is fixedly connected to the top of the connecting rod.

[0010] Preferably, the elastic force of the first spring is less than the elastic force of the second spring.

[0011] Preferably, the adjusting mechanism further includes two sliding rods corresponding to a single arc-shaped plate. The sliding rods are fixedly connected with the arc-shaped plate. One end of the sliding rod is fixedly connected with a connecting plate. A tension spring is fixedly connected to one side of the connecting plate. One end of the tension spring is fixedly connected with the inner wall of the filter cylinder.

[0012] Preferably, an adjusting air hole is formed in the regulating block. Air vent cavities communicating with each other are formed at the centers of the sealing block, the connecting rod and the blocking block. The adjusting air hole is communicated with the air vent cavities. An adjusting rod for driving the connecting plate to move is slidably arranged inside the adjusting air hole. A limiting block is fixedly connected to one end of the adjusting rod. A limiting groove for the adjusting rod to slide is formed at a position near the midpoint of one side of the connecting plate. The width of the limiting groove is less than the diameter of the limiting block.

[0013] Preferably, the number of the arc-shaped plates is set to be several. The number of the adjusting air holes is adapted to the number of the arc-shaped plates. The lengths of the sliding rods corresponding to different arc-shaped plates are not equal, so that the distances between different arc-shaped plates and the outer wall of the filter cylinder are not equal when the tension spring is in the initial contracted state.

[0014] Preferably, the length of the limiting groove is less than the distance that the adjusting rod can move up and down, and a convex block is fixedly connected to one side of the connecting plate.

[0015] Preferably, a sealing airbag is fixedly arranged on the inner wall of the water inlet, a pressurizing piston is slidably sleeved on one side of the bottom end of the inner wall of the liquid storage bottle, a pressurizing hole is formed on one side of the bottom end inside the liquid storage bottle, the pressurizing hole is communicated with the sealing airbag, a baffle for closing the pressurizing hole is slidably arranged on one side of the bottom of the liquid storage bottle, a communication hole is formed in the bottom of the baffle, the diameter of the communication hole is adapted to the aperture of the pressurizing hole, and a third spring for the baffle to extend out is fixedly connected to the top of the baffle.

[0016] Preferably, a reset air hole is formed on one side inside the liquid storage bottle, the reset air hole is communicated with the gas cavity, and a limiting piston is movably sleeved on one side of the bottom end inside the liquid storage bottle.

[0017] The present invention has the following beneficial effects:

[0018] 1. By controlling the air pressure in the gas cavity of the liquid storage bottle, the present invention opens the water inlet under the action of the water pressure and the air pressure difference after the liquid storage bottle reaches the target layer, and pushes the sliding plug upward for sampling under the action of the water pressure, so that the gas in the gas cavity is extracted through the branch pipe and the main pipe, avoiding disturbing the water body of the target layer and affecting the sampling quality. At the same time, the liquid blocking block can block the water inlet before the water inlet is opened and the liquid storage bottle remains closed, avoiding bringing the water in other positions to the target layer during the movement of the liquid storage bottle in the water body and causing cross-contamination. At the same time, under the action of the gas cavity pressure, the adjusting block cooperates with the adjusting rod, the limiting block, the connecting plate and the sliding rod to drive the arc plate to move. When ensuring that the pressure difference between the gas cavity and the water pressure is large enough, the amount of the arc plate blocking the filter hole can be adjusted according to the pressure difference, and the water inlet flow rate can be adjusted to avoid the water body flow rate being too fast and causing the water body disturbance of the target layer, further improving the reliability of the use of the water sampler.

[0019] 2. By arranging multiple arc plates in cooperation with sliding rods of different lengths, different arc plates close the filter holes successively when the pressure difference between the gas cavity and the water body reaches different values, improving the range and flexibility of adjusting the water body flow rate, further ensuring sampling under the condition of not easily causing water body disturbance. At the same time, after the sampling is completed, the water pressure of the water sample can drive the pressurizing piston to move downward, so that the gas in the pressurizing hole communicated under the action of the adjusting block and the baffle is filled into the sealing airbag, increasing the pressure of the sealing airbag. And when releasing the water sample, the gas cavity is inflated to push the limiting piston to drive the pressurizing piston to reset, and the water inlet is opened when the frictional force between the sealing airbag and the sealing block is restored, avoiding additional wear of the sealing block, improving the sealing effect and prolonging the service life of the water sampler. Description of the Drawings

[0020] Figure 1Schematic diagram of the overall structure of the present invention;

[0021] Figure 2 Schematic cross-sectional view of the structure of a single liquid storage bottle of the present invention;

[0022] Figure 3 Schematic cross-sectional view of the structure at the sliding plug of the present invention;

[0023] Figure 4 For the present invention Figure 3 Enlarged view of the structure at position A in;

[0024] Figure 5 For the present invention Figure 3 Enlarged view of the structure at position B in;

[0025] Figure 6 Schematic diagram of the structure at the sliding rod of the present invention;

[0026] Figure 7 Schematic diagram of the structure at the adjusting block of the present invention.

[0027] In the figure: 1. Liquid storage bottle; 2. Counterweight; 3. Lifting rope; 4. Main pipe; 5. Branch pipe; 6. Solenoid valve; 7. Filter cartridge; 8. Arc plate; 9. Sliding plug; 10. Sealing block; 11. Spring seat; 12. First spring; 13. Liquid blocking block; 14. Connecting rod; 15. Ventilation cavity; 16. Block; 17. Reset air hole; 18. Adjusting air hole; 19. Adjusting block; 20. Baffle; 21. Communication hole; 22. Boosting hole; 23. Boosting piston; 24. Limiting piston; 25. Sealing airbag; 26. Third spring; 27. Sliding rod; 28. Tension spring; 29. Adjusting rod; 30. Limiting block; 31. Connecting plate; 32. Convex block; 33. Second spring; 34. Limiting groove. Detailed implementation manners

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with 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.

[0029] Embodiment 1

[0030] Please refer to Figure 1 and Figure 2, A water quality detection water sampler, comprising a liquid storage bottle 1. One side of the liquid storage bottle 1 is fixedly connected with a counterweight 2. The number of liquid storage bottles 1 is set to several, and several liquid storage bottles 1 are arranged in a circular and evenly distributed manner outside the counterweight 2. A water storage cavity for storing water samples is provided inside the liquid storage bottle 1. The top of the liquid storage bottle 1 is fixedly connected with a branch pipe 5. At the midpoint of the top of the counterweight 2, a lifting rope 3 for lowering the counterweight 2 is fixedly connected. The top of the counterweight 2 is fixedly connected with a main pipe 4. The main pipe 4 is a flexible pipe and is sleeved inside the lifting rope 3. One end of the main pipe 4 is connected to a pneumatic control device, which is preferably a two-way air pump. The other end of the main pipe 4 is communicated with the branch pipe 5. The branch pipe 5 communicates the main pipe 4 and the water storage cavity, so that the water storage cavity is connected to the two-way air pump. A sliding plug 9 is slidably sleeved inside the liquid storage bottle 1. A sliding sealing mechanism is provided between the sliding plug 9 and the liquid storage bottle 1. The sliding sealing mechanism is preferably an O-ring. The sliding plug 9 divides the water storage cavity into a gas cavity at the top and a water storage cavity at the bottom.

[0031] At the midpoint of the bottom of the liquid storage bottle 1, a water inlet is provided. Inside the sliding plug 9, a liquid blocking block 13 for closing the water inlet is slidably sleeved. When the lifting rope 3 is released to make the water sampler descend, the liquid blocking block 13 always blocks the water inlet to prevent water from other layers from staying in the water inlet and being brought to the target layer, resulting in possible water sample pollution. At the midpoint of the top of the sliding plug 9, a spring seat 11 is fixedly provided. The top and bottom cavities of the spring seat 11 are communicated. At the bottom of the spring seat 11, a first spring 12 for pushing the liquid blocking block 13 to extend out of the sliding plug 9 is fixedly connected. The cross-section of the liquid blocking block 13 is T-shaped, ensuring that the water blocking block can slide axially relative to the sliding plug 9 without detaching from the sliding plug 9. A solenoid valve 6 is fixedly provided on the pipe body of the branch pipe 5. A sliding sealing mechanism is provided between the liquid blocking block 13 and the sliding plug 9.

[0032] The bottom of the liquid storage bottle 1 is fixedly connected with a filter cylinder 7. A plurality of filter holes are provided on the side wall of the filter cylinder 7. The plurality of filter holes are arranged in a circular and evenly spaced manner on the side wall of the filter cylinder 7. Inside the liquid blocking block 13, a connecting rod 14 is slidably sleeved. At the bottom of the connecting rod 14, a sealing block 10 for closing the water inlet is fixedly connected. The diameter of the sealing block 10 is adapted to the diameters of the liquid blocking block 13 and the water inlet. At the bottom of the sealing block 10, an adjusting block 19 is fixedly connected. At the top of the adjusting block 19, a second spring 33 for keeping the sealing block 10 extending out of the water inlet is fixedly connected. One end of the second spring 33 is fixedly connected to the liquid storage bottle 1 and is sleeved outside the sealing block 10. At the top of the connecting rod 14, a blocking block 16 is fixedly connected.

[0033] When sampling, release the lifting rope 3 to the rated length. Driven by the counterweight 2, several liquid storage bottles 1 descend to the target layer. Open the solenoid valve 6 corresponding to the liquid storage bottle 1 for sampling at the target layer. The two-way air pump evacuates the gas cavity through the main pipe 4 and the corresponding branch pipe 5, reducing the air pressure in the gas cavity. At this time, the liquid blocking block 13 moves upward under the action of water pressure, overcoming the elastic force of the first spring 12, until the bottom surface of the liquid blocking block 13 is flush with the bottom surface of the sliding plug 9, reaching the limit of relative movement. At this time, the liquid blocking block 13 and the sliding plug 9 move upward synchronously. When the water storage cavity is connected to the water inlet, increase the air pressure in the gas cavity while keeping it less than the water pressure. The first spring 12 gradually pushes the liquid blocking block 13 to reset relative to the sliding plug 9, and the water inlet remains open. The second spring 33 pushes the adjusting block 19, causing the adjusting block 19 to drive the sealing block 10 to always be at the bottom of the water inlet without sealing the water inlet until the sliding plug 9 moves to the top dead center. At this time, the sealing block 10 contacts the stop block 16, and the top surface of the sealing block 10 seals the bottom surface of the water inlet. Reduce the air pressure in the gas cavity, and under the condition that the sliding plug 9 remains relatively stationary with the liquid storage bottle 1, the water pressure pushes the sealing block 10 to move upward, overcoming the combined force of the first spring 12 and the second spring 33, until the sealing plug completely seals the water inlet, stopping the water intake to complete the sample injection. Close the solenoid valve 6 and perform sampling at the next position. During the sampling process, the gas in the gas cavity is discharged through the branch pipe 5 and the main pipe 4, without disturbing the water sample at the target layer and causing errors in the test results, improving the sampling effect of this water sampler. Moreover, when sampling multiple target layers, it avoids cross-contamination caused by the retention of water samples from other layers in the water inlet or the water storage cavity.

[0034] Embodiment 2

[0035] Refer to Figure 2 and Figure 3 Based on Embodiment 1, the elastic force of the first spring 12 is less than the elastic force of the second spring 33. During the sample injection process, after reducing the air pressure in the gas cavity, keep it unchanged, so that the liquid blocking block 13 moves upward synchronously with the sliding plug 9 while remaining in a contracted state relative to the sliding plug 9 until the top of the liquid blocking block 13 contacts the stop block 16. At this time, the sliding plug 9 has not reached the top dead center. Since the elastic force of the first spring 12 is less than the elastic force of the second spring 33, under the limit of the stop block 16, the sliding plug 9 continues to move while the liquid blocking block 13 remains stationary relative to the liquid storage bottle 1 until the sliding plug 9 moves to the top dead center. At this time, reduce the air pressure in the gas cavity, and the water pressure pushes the sealing block 10 to move upward, overcoming the combined force of the first spring 12 and the second spring 33, completing the sample injection, improving the sample injection rate and operation convenience.

[0036] Embodiment 3.

[0037] Refer to Figures 1-4 、 Figure 6 and Figure 7, on the basis of the second embodiment, an arc-shaped plate 8 for closing the filter holes is arranged on the outer side of the filter cartridge 7. The arc-shaped plate 8 is in an arc shape adapted to the annular outer wall of the filter cartridge 7. A sliding rod 27 is fixedly connected to the inner side of the arc-shaped plate 8 close to the filter cartridge 7. The number of the sliding rods 27 is set to two, and both of the two sliding rods 27 are slidably sleeved on the filter cartridge 7. One end of the sliding rod 27 is fixedly connected to a connecting plate 31 for driving the sliding rod 27 to move. The connecting plate 31 is located inside the filter cartridge 7. A tension spring 28 is fixedly connected to one side of the connecting plate 31. One end of the tension spring 28 is fixedly connected to the inner wall of the filter cartridge 7. The tension spring 28 drives the connecting plate 31 to approach the filter cartridge 7. The connecting plate 31 drives the sliding rod 27 to move. The sliding rod 27 drives the arc-shaped plate 8 to move away from the outer wall of the filter cartridge 7, so that the filter holes are kept open.

[0038] An adjustment air hole 18 is formed inside the adjustment block 19. Air cavities 15 communicating with each other are formed at the centers of the sealing block 10, the connecting rod 14 and the stopper 16. The adjustment air hole 18 communicates with the air cavity 15, so that the adjustment air hole 18 communicates with the gas cavity. An adjustment rod 29 for driving the connecting plate 31 to move is slidably arranged inside the adjustment air hole 18. One end of the rod body of the adjustment rod 29 extends out of the adjustment block 19. The rod body of the adjustment rod 29 is in a T shape and the wide end is located inside the adjustment air hole 18. A limit block 30 is fixedly connected to one end of the adjustment rod 29. A limit groove 34 for the adjustment rod 29 to slide is formed at the midpoint of one side of the connecting plate 31. The rod body of the adjustment rod 29 is slidably sleeved inside the limit groove 34. The width of the limit groove 34 is smaller than the diameter of the limit block 30.

[0039] During the sample injection process, when the air pressure in the gas cavity decreases and the water inlet rate is too high, the air pressure at one end of the adjustment rod 29 located inside the adjustment block 19 decreases. Under the action of the water pressure, the adjustment rod 29 contracts into the adjustment block 19. The movement of the adjustment rod 29 drives the limit block 30 to move. The limit block 30 abuts against the connecting plate 31 and drives the connecting plate 31 to move in the direction close to the adjustment block 19 against the tension of the tension spring 28. The connecting plate 31 cooperates with the sliding rod 27 to drive the arc-shaped plate 8 to move close to the filter cartridge 7 until the inner wall of the arc-shaped plate 8 fits against the outer wall of the filter cartridge 7. At this time, the arc-shaped plate 8 blocks part of the filter holes, reducing the water inlet rate of the water storage cavity, so that the water sampler injects the sample at a water inlet rate that is not likely to cause water disturbance, further improving the sampling effect.

[0040] The number of the arc-shaped plates 8 is set to several. The number of the adjustment air holes 18 is adapted to the number of the arc-shaped plates 8 and all communicate with the air cavity 15. Refer to Figure 6, the lengths of the sliding rods 27 corresponding to different arc-shaped plates 8 are unequal, so that the distances of different arc-shaped plates 8 from the outer wall of the filter cartridge 7 are unequal when the tension spring 28 is in the initial contracted state. Furthermore, under the same air chamber pressure, after different arc-shaped plates 8 contract by the same distance, the distances from the outer wall of the filter cartridge 7 are different. The smaller the air chamber pressure, the more arc-shaped plates 8 that fit the filter cartridge 7 and the more filter holes are closed, ensuring that the water inlet rate is within the rated range. Further, when the pressure in the air chamber decreases, it is ensured that the water inlet rate does not easily disturb the water body.

[0041] The length of the limiting groove 34 is less than the distance that the adjusting rod 29 moves up and down following the adjusting block 19. When the sealing block 10 seals the water inlet, the adjusting rod 29 disengages from the limiting groove 34. That is, after the sampling is completed, the tension spring 28 drives the connecting plate 31 to reset, and the transmission drives the arc-shaped plate 8 to reset, and the filter holes are restored to open, which does not affect the subsequent pouring out of the water sample. When pouring out the water sample after lifting the water sampler, the air pressure in the air chamber is increased, so that the sealing block 10 moves to open the water inlet, and the sliding plug 9 and the adjusting rod 29 are reset. Refer to Figure 7 , one side of the connecting plate 31 is fixedly connected with a convex block 32. After the connecting plate 31 contracts under the action of the tension spring 28, the convex block 32 abuts against the inner wall of the filter cartridge 7 to determine the position of the connecting plate 31. When the adjusting rod 29 resets and extends, when the adjusting rod 29 descends, it can be re-embedded in the limiting groove 34.

[0042] Embodiment 4

[0043] Refer to Figures 1-3 、 Figure 5 and Figure 6 , on the basis of Embodiment 3, a sealing airbag 25 is fixedly arranged on the inner wall of the water inlet. One side of the bottom end of the inner wall of the liquid storage bottle 1 is slidably sleeved with a T-shaped pressure increasing piston 23. One side of the bottom end of the liquid storage bottle 1 is provided with a pressure increasing hole 22. One end of the pressure increasing hole 22 is communicated with the sealing airbag 25, and the other end of the pressure increasing hole 22 is communicated with the bottom of the movable cavity of the pressure increasing piston 23 located in the liquid storage bottle 1. One side of the inside of the liquid storage bottle 1 is provided with a reset air hole 17. One end of the reset air hole 17 is located at the top of the inner wall of the liquid storage bottle 1. One side of the bottom end of the liquid storage bottle 1 is slidably sleeved with a T-shaped limiting piston 24. The other end of the reset air hole 17 is communicated with the bottom of the movable cavity of the limiting piston 24 located in the liquid storage bottle 1. A baffle 20 corresponding to the position of the adjusting block 19 is slidably arranged on one side of the bottom of the liquid storage bottle 1. The baffle 20 is in an inverted L shape, so that the baffle 20 can slide relative to the liquid storage bottle 1 without detaching from the liquid storage bottle 1. The baffle 20 is used to close the pressure increasing hole 22.

[0044] A communication hole 21 is formed at the bottom of the baffle plate 20. The diameter of the communication hole 21 is adapted to the aperture of the pressure increasing hole 22. A third spring 26 for the baffle plate 20 to extend is fixedly connected to the top of the baffle plate 20. When the adjusting block 19 moves upward to contact the baffle plate 20, the baffle plate 20 is pushed to contract into the interior of the liquid storage bottle 1 until the position of the communication hole 21 corresponds to the position of the pressure increasing hole 22. At this time, the sample injection is completed. Under the water pressure of the water sample in the water storage cavity, the pressure increasing piston 23 moves downward to push the gas to enter the sealed airbag 25 through the pressure increasing hole 22, and at the same time drives the limit piston 24 to move downward. The sealed airbag 25 changes from a balanced state flush with the inner wall of the water inlet to expand and compress the sealing block 10, increasing the reliability of the sealing of the sealing block 10. When pouring out the water sample, the air pressure in the gas cavity increases, and the limit piston 24 is pushed to drive the pressure increasing piston 23 to move upward and reset through the reset air hole 17. At the same time, before the sealing block 10 opens the water inlet, the extra frictional force is removed, avoiding the extra frictional resistance on the sealing block 10 while ensuring reliable sealing.

[0045] The usage method (working principle) of the present invention is as follows:

[0046] Release the lifting rope 3 to lower the water sampler to the target layer. The two-way air pump pumps air to reduce the gas cavity pressure in the liquid storage bottle 1. Under the water pressure, the liquid blocking block 13 opens the water inlet and cooperates with the sliding plug 9 to move upward. At this time, the adjusting rod 29 contracts under the action of the pressure difference between the water pressure and the gas cavity pressure, and drives the connecting plate 31 to drive the arc plate 8 to move against the pulling force of the tension spring 28, so that the arc plate 8 moves to fit against the outer wall of the filter cylinder 7 to seal the filter holes, avoiding too large water inlet rate, and the gas cavity pressure is adapted to the number of arc plates 8 fitting against the outer wall of the filter cylinder 7, further ensuring sample injection under the condition of not easily causing water body disturbance.

[0047] After the sliding plug 9 moves to the upper dead center, the sealing block 10 moves alone to seal the water inlet to complete the sample injection. At this time, the adjusting rod 29 disengages from the limit groove 34, and the arc plate 8 resets to open the filter holes, which does not affect the subsequent pouring out of the water sample. And the adjusting block 19 pushes the baffle plate 20 to contract, so that the communication hole 21 corresponds to the pressure increasing hole 22. The water sample pushes the pressure increasing piston 23, so that the sealed airbag 25 is inflated and expanded to improve the sealing performance. Close the corresponding solenoid valve 6 to perform sampling at the next position. When pouring out the water sample, the two-way air pump inflates the gas cavity, and the limit piston 24 is pushed to move through the reset air hole 17, and then drives the pressure increasing piston 23 to reset. The sealed airbag 25 returns to the balanced state, completing the sampling of the water sampler under the condition of not easily causing water body disturbance and avoiding cross-contamination of water bodies at different positions.

Claims

1. A water quality detection water sampler, comprising a liquid storage bottle (1), one side of the liquid storage bottle (1) is fixedly connected with a counterweight (2), the top of the counterweight (2) is fixedly connected with a lifting rope (3), and a water inlet is opened at the bottom of the liquid storage bottle (1), characterized in that: The top of the counterweight block (2) is fixedly connected to a main pipe (4). The top of the liquid storage bottle (1) is fixedly connected to a branch pipe (5) that communicates with the main pipe (4). One end of the main pipe (4) is connected to a pneumatic control device. A sliding plug (9) is slidably sleeved inside the liquid storage bottle (1). The sliding plug (9) divides the water storage cavity into a gas cavity at the top and a water storage cavity at the bottom. A solenoid valve (6) is fixedly arranged on the pipe body of the branch pipe (5). The bottom of the liquid storage bottle (1) is fixedly connected to a filter cartridge (7). A number of filter holes are formed in the side wall of the filter cartridge (7). An arc-shaped plate (8) for closing the filter holes is arranged outside the filter cartridge (7). A sealing block (10) for closing the water inlet is arranged at the bottom of the liquid storage bottle (1). An adjusting mechanism is arranged at the bottom of the liquid storage bottle (1). The adjusting mechanism can adjust the number of filter holes blocked by the arc-shaped plate (8) according to the pressure difference between the gas cavity pressure and the water pressure, and adjust the flow rate of water passing through the filter cartridge (7). The adjusting mechanism can cooperate with the sliding plug (9) to adjust the position of the sealing block (10), and drive the sealing block (10) to move to seal the water inlet by using the pressure difference between the gas cavity and the water pressure during sample injection.

2. The water quality detection water sampler according to claim 1, characterized in that: The number of the liquid storage bottles (1) is set to be several. The arc-shaped plate (8) is in an arc shape adapted to the outer wall of the filter cartridge (7).

3. A water quality detection water sampler according to claim 1, characterized in that: The adjusting mechanism includes a liquid blocking block (13). The liquid blocking block (13) is slidably sleeved with the sliding plug (9). A spring seat (11) is fixedly arranged at the midpoint of the top of the sliding plug (9). A first spring (12) for pushing the liquid blocking block (13) to extend out of the sliding plug (9) is fixedly connected to the bottom of the spring seat (11). A connecting rod (14) is slidably sleeved inside the liquid blocking block (13). The connecting rod (14) is fixedly connected to the sealing block (10). A regulating block (19) is fixedly connected to the bottom of the sealing block (10). A second spring (33) for keeping the sealing block (10) extending out of the water inlet is fixedly connected to the top of the regulating block (19). A stop block (16) is fixedly connected to the top of the connecting rod (14).

4. The water quality detection water sampler according to claim 3, characterized in that: The elastic force of the first spring (12) is less than the elastic force of the second spring (33).

5. A water quality detection water sampler according to any one of claims 3 or 4, characterized in that: The adjusting mechanism further includes two sliding rods (27) corresponding to a single arc-shaped plate (8). The sliding rods (27) are fixedly connected to the arc-shaped plate (8). One end of the sliding rod (27) is fixedly connected to a connecting plate (31). A tension spring (28) is fixedly connected to one side of the connecting plate (31). One end of the tension spring (28) is fixedly connected to the inner wall of the filter cartridge (7).

6. The water quality detection water sampler according to claim 5, characterized in that: An adjustment air hole (18) is formed inside the adjustment block (19). Communication cavities (15) that communicate with each other are formed at the centers of the sealing block (10), the connecting rod (14), and the stop block (16). The adjustment air hole (18) communicates with the communication cavity (15). An adjustment rod (29) for driving the connection plate (31) to move is slidably arranged inside the adjustment air hole (18). One end of the adjustment rod (29) is fixedly connected with a limit block (30). A limit groove (34) for the adjustment rod (29) to slide is formed at a position near the midpoint on one side of the connection plate (31). The width of the limit groove (34) is smaller than the diameter of the limit block (30).

7. The water quality detection water sampler according to claim 6, characterized in that: The number of the arc-shaped plates (8) is set to be several. The number of the adjustment air holes (18) is adapted to the number of the arc-shaped plates (8). The lengths of the sliding rods (27) corresponding to different arc-shaped plates (8) are not equal, so that the distances between different arc-shaped plates (8) and the outer wall of the filter cartridge (7) are not equal when the tension spring (28) is in the initial contracted state.

8. The water quality detection water sampler according to claim 7, characterized in that: The length of the limit groove (34) is smaller than the distance that the adjustment rod (29) can move up and down. A convex block (32) is fixedly connected to one side of the connection plate (31).

9. A water quality detection water sampler according to claim 1, characterized in that: A sealing air bag (25) is fixedly arranged on the inner wall of the water inlet. A pressurizing piston (23) is slidably sleeved on one side of the bottom end of the inner wall of the liquid storage bottle (1). A pressurizing hole (22) is formed on one side of the bottom end inside the liquid storage bottle (1). The pressurizing hole (22) communicates with the sealing air bag (25). A baffle (20) for closing the pressurizing hole (22) is slidably arranged on one side of the bottom of the liquid storage bottle (1). A communication hole (21) is formed at the bottom of the baffle (20). The diameter of the communication hole (21) is adapted to the aperture of the pressurizing hole (22). A third spring (26) for the baffle (20) to extend is fixedly connected to the top of the baffle (20).

10. A water quality detection water sampler according to claim 9, characterized in that: A reset air hole (17) is formed on one side inside the liquid storage bottle (1). The reset air hole (17) communicates with the gas cavity. A limit piston (24) is movably sleeved on one side of the bottom end inside the liquid storage bottle (1).

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