Water quality detection sampling device for hydraulic engineering

Abstract

This utility model relates to the field of water quality testing technology for water conservancy projects, specifically a water quality testing sampling device for water conservancy projects. It includes a sampling cylinder with a sampling port at its lower end. Inside the sampling cylinder is a piston that can slide up and down, and a limiting structure that restricts the piston's upward sliding to its limit position. A first pull rope is fixedly connected to the piston, extending from the upper opening of the sampling cylinder. A negative pressure cover with its opening facing downwards is fixedly connected to the upper end of the sampling cylinder. An air hole is provided at the top of the negative pressure cover, and a sealing element for sealing the air hole is elastically connected to the outside of the negative pressure cover. A second pull rope is fixedly connected to the sealing element. This utility model, through the combined use of the negative pressure cover, the sealing element, and the second pull rope, can fix the sampling cylinder in a vertical position during sampling, ensuring that the depth of the sampling port is stable and not easily pulled, thereby improving the accuracy of sampling.

Description

Technical Field

[0001] This utility model relates to the field of water quality testing technology for water conservancy projects, specifically a water quality testing and sampling device for water conservancy projects. Background Technology

[0002] Water quality testing, as an important component of water conservancy projects, plays an irreplaceable role in ensuring the effective utilization of water resources and environmental protection. Because water quality can vary at different depths, precise sampling from various depths is often necessary for water quality analysis to ensure sample representativeness and accurate test results.

[0003] In existing technologies, such as the water quality testing sampling device for water conservancy projects disclosed in patent application number CN201720335439.9, operators can select and assemble an appropriate number of intermediate sampling tubes according to actual needs, enabling the collection of water samples at different depths. However, during use, it was found that this sampling device completes the water collection process by pulling the piston rod and rubber stopper upward within the body composed of the upper, intermediate, and lower sampling tubes using a traction rope. During this process, the sampling device mainly relies on its own weight and counterweight to remain in the water, but due to buoyancy and the friction between the rubber stopper and the inner wall of the body, the sampling device is easily pulled upward by the traction rope, causing changes in the preset water sampling depth. This phenomenon not only affects the accuracy of sampling but may even lead to the failure to successfully obtain the required water quality sample. To address the above problems, this utility model proposes a water quality testing sampling device for water conservancy projects that can stabilize the water sampling depth. Utility Model Content

[0004] The purpose of this invention is to provide a water quality testing and sampling device for water conservancy projects, which solves the problems mentioned in the background art.

[0005] This utility model is achieved through the following technical solution:

[0006] A water quality testing and sampling device for a water conservancy project includes a sampling cylinder with a sampling port at its lower end. Inside the sampling cylinder is a piston that can slide up and down, and a limiting structure that restricts the piston's upward sliding to a limit position. A first pull rope is fixedly connected to the piston, extending from the upper opening of the sampling cylinder. A negative pressure hood with its opening facing downwards is fixedly connected to the upper end of the sampling cylinder. An air hole is provided at the top of the negative pressure hood, and a sealing member for sealing the air hole is elastically connected to the outside of the negative pressure hood. A second pull rope is fixedly connected to the sealing member.

[0007] Optionally, a connecting pipe is fixedly installed at the center of the negative pressure hood, and the upper end of the sampling cylinder is threadedly connected to the connecting pipe.

[0008] Optionally, a filter structure is provided at the sampling port.

[0009] Optionally, the filter structure is a hemispherical shell-shaped filter screen.

[0010] Optionally, the filter screen is detachably connected to the sampling cylinder via a connecting structure.

[0011] Optionally, the connection structure is an annular connecting boss fixedly installed at the lower end of the sampling cylinder, and the inner side of the opening of the filter screen plate is provided with an internal thread that engages with the thread of the connecting boss.

[0012] Optionally, the piston includes a piston head and a piston rod. The piston head is disposed inside the sampling cylinder. The lower end of the piston rod is fixedly connected to the piston head. The upper end of the piston rod extends to the outside of the sampling cylinder and is fixedly provided with a first lifting ring. The first pull rope is fixedly connected to the first lifting ring.

[0013] Optionally, an installation platform is fixedly provided at the upper end of the connecting pipe, and the sealing member is movably provided through the installation platform. The upper end of the sealing member is fixedly connected to the second pull rope, and the lower end of the sealing member is the sealing end. A spring is provided between the sealing end and the installation platform.

[0014] Optionally, a second lifting ring is fixedly provided at the upper end of the sealing component, and the second pull rope is fixedly connected to the second lifting ring.

[0015] Optionally, the side of the sealing end that contacts the vent is provided with a sealing structure.

[0016] Compared with the prior art, this utility model provides a water quality testing and sampling device for water conservancy projects, which has the following beneficial effects:

[0017] 1. This utility model, through the combined use of a negative pressure cover, a sealing component, and a second pull rope, can fix the sampling cylinder in a vertical position during sampling, ensuring that the depth of the sampling port is stable and not easily pulled, thereby improving the accuracy of sampling;

[0018] 2. This utility model has a connecting pipe fixedly installed at the center of the negative pressure hood. The upper end of the sampling tube is threadedly connected to the connecting pipe. The operator can adjust the vertical distance between the sampling hole at the lower end of the sampling tube and the negative pressure hood according to the actual water sampling depth, so that the sampling hole can reach the required water sampling depth, thereby achieving the purpose of sampling water at different depths.

[0019] 3. This utility model reduces the possibility of the sampling port being blocked by a filter structure installed at the sampling port, which can prevent aquatic plants and other debris from entering the sampling port. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0021] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0022] Figure 3 For the present utility model Figure 2 Front view structural diagram;

[0023] Figure 4 For the present utility model Figure 2 A magnified structural diagram at point A.

[0024] In the diagram: 10. Sampling cylinder; 11. Sampling port; 12. Filter screen; 13. Connecting boss; 14. Narrowing; 20. Piston; 200. Piston head; 201. Piston rod; 21. First pull rope; 22. First lifting ring; 30. Negative pressure cover; 31. Air hole; 32. Connecting pipe; 33. Mounting platform; 40. Sealing component; 41. Second pull rope; 410. Main rope body; 411. Branch rope; 42. Sealing end; 43. Spring; 44. Second lifting ring; 45. Rubber sealing gasket. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Example: Please refer to Figures 1 to 4 According to an embodiment of the present invention, a water quality testing and sampling device for water conservancy projects is provided, including a sampling cylinder 10. A sampling port 11 is provided at the lower end of the sampling cylinder 10. The sampling port 11 is a small circular hole provided at the lower end of the sampling cylinder 10. Inside the sampling cylinder 10, there is a piston 20 that can slide up and down and a limiting structure that limits the piston 20 to the extreme position of upward sliding. The limiting structure is a constriction 14 provided in the middle of the sampling cylinder 10. The piston 20 can move freely up and down below the constriction 14. The constriction 14 is used to limit the piston 20 from continuing to move upward. A first pull rope 21 is fixedly connected to the piston 20 and extends from the upper opening of the sampling cylinder 10. A negative pressure cover 30 with its opening facing downward is fixedly connected to the upper end of the sampling cylinder 10. An air hole 31 is provided at the top of the negative pressure cover 30. A sealing member 40 for sealing the air hole 31 is elastically connected to the outside of the negative pressure cover 30. A second pull rope 41 is fixedly connected to the sealing member 40.

[0027] The water quality testing sampling device for hydraulic engineering using the above-described structure is first lowered into the water area to be sampled by pulling the second rope 41. During this process, due to the gravity of the sampling cylinder 10 and the negative pressure hood 30, the sealing member 40 will move away from the air hole 31, allowing water to smoothly enter the negative pressure hood 30 from the lower opening. When the sampling port 11 reaches the designated depth, the second rope 41 is released and the first rope 21 is pulled upwards. At this time, the sealing member 40 will re-block the air hole 31 under the action of elastic force, making the negative pressure hood 30 form a suction cup-like effect, firmly adhering to the water surface. As the first rope 21 is pulled upwards, the piston 20 moves upwards inside the sampling cylinder 10, causing water to be drawn into the sampling cylinder 10 from the sampling port 11. During the upward movement of piston 20, although there is some friction between piston 20 and sampling cylinder 10, the negative pressure cover 30 is adsorbed onto the water surface, which greatly reduces the possibility of the sampling cylinder 10 changing position due to friction. Therefore, the depth of sampling port 11 remains relatively stable, ensuring the accuracy of sampling.

[0028] To achieve water sampling at different depths, a connecting pipe 32 is fixedly installed at the center of the negative pressure hood 30, and the upper end of the sampling cylinder 10 is threadedly connected to the connecting pipe 32. Specifically, since the negative pressure hood 30 needs to be positioned at the water surface to create the aforementioned "suction cup-like effect," the farther the sampling port 11 at the lower end of the sampling cylinder 10 is vertically from the negative pressure hood 30, the greater the water sampling depth; conversely, the farther away, the smaller the water sampling depth. Returning to this embodiment, the operator can adjust the vertical distance between the sampling port at the lower end of the sampling cylinder 10 and the negative pressure hood 30 according to the actual water sampling depth, thereby enabling the sampling port to reach the required water sampling depth.

[0029] To reduce the possibility of the sampling port 11 becoming clogged during water collection, a filter structure is provided at the sampling port 11 in this exemplary embodiment. The filter structure can prevent aquatic plants and other debris from entering the sampling port 11, thereby reducing the possibility of the sampling port 11 becoming clogged.

[0030] In this exemplary embodiment, the filter structure is a hemispherical filter plate 12. Compared with a planar filter structure, the hemispherical filter plate 12 has a larger filtration area and can improve sampling efficiency.

[0031] During use, the filter screen 12 inevitably becomes clogged. To facilitate cleaning or replacement of the clogged filter screen 12, in this exemplary embodiment, the filter screen 12 is detachably connected to the sampling cylinder 10 via a connecting structure, allowing for easy disassembly of the filter screen 12 when clogged. The connecting structure is an annular connecting boss 13 fixedly disposed at the lower end of the sampling cylinder 10, with an internal thread on the inner side of the opening of the filter screen 12 that engages with the threaded connection boss 13. Connecting the filter screen 12 to the sampling cylinder 10 via a threaded connection makes disassembly of the filter screen 12 easier. Of course, the filter screen 12 and the sampling cylinder 10 can also be connected and fixed via snap-fit, magnetic attraction, or other connecting structures. As long as the filter screen 12 and the sampling cylinder 10 can be detachably connected, the specific structural form of the connecting structure is not particularly limited.

[0032] In this exemplary embodiment, the piston 20 includes a piston head 200 and a piston rod 201. The piston head 200, made of rubber, is disposed inside the sampling cylinder 10. The lower end of the piston rod 201 is fixedly connected to the piston head 200, and the upper end of the piston rod 201 extends to the outside of the sampling cylinder 10 and is fixedly provided with a first lifting ring 22. A first pull rope 21 is fixedly connected to the first lifting ring 22. By providing a first lifting ring 22 on the piston 20, it is convenient to connect the first pull rope 21 to the piston 20.

[0033] To enable the opening and closing of the vent 31, in this exemplary embodiment, a mounting platform 33 is fixedly installed at the upper end of the connecting pipe 32. A sealing member 40 is vertically movably installed through the mounting platform 33. The upper end of the sealing member 40 is fixedly connected to the second pull rope 41, and the lower end of the sealing member 40 is the sealing end 42. A spring 43 is installed between the sealing end 42 and the mounting platform 33. When the second pull rope 41 is not subjected to upward tension, the sealing end 42 of the sealing member 40 presses against the vent 31 of the negative pressure cover 30 under the elastic force of the spring 43. When the operator pulls the second pull rope 41 upward, under the gravity of the sampling cylinder 10 and the negative pressure cover 30, the sealing end 42 of the sealing member 40 will leave the vent 31, and the spring 43 will be compressed and stored. When the operator releases the second pull rope 41 again, the sealing end 42 of the sealing member 40 will re-block the vent 31 under the elastic force of the spring 43.

[0034] In this exemplary embodiment, a second lifting ring 44 is fixedly provided at the upper end of the sealing member 40, and a second pull rope 41 is fixedly connected to the second lifting ring 44. By providing a second lifting ring 44 at the upper end of the sealing member 40, it is convenient to connect the second pull rope 41 to the sealing member 40. In addition, in order to improve the stability of the sampling device when it is lowered, in this embodiment, a sealing member 40 is provided on each of the left and right sides of the negative pressure cover 30. The second pull rope 41 includes two branch ropes 411 that are respectively connected to the second lifting rings 44 of the two sealing members 40, and a main rope 410 connecting the two branch ropes 411. When the sampling device is lowered by pulling the main rope 410, since both sides of the sampling device are subjected to the upward pulling force of the second pull rope 41, the sampling device can always maintain a relatively vertical state when it is lowered, and has good stability.

[0035] To improve the sealing performance between the sealing end 42 of the sealing member 40 and the vent 31, and to enable the negative pressure cover 30 to provide a stable adsorption force and adhere to the water surface, in this exemplary embodiment, a sealing structure is provided on the side of the sealing end 42 that contacts the vent 31. Specifically, the sealing structure in this embodiment is a rubber sealing gasket 45, which is adhered to the side of the sealing end 42 facing the vent 31.

[0036] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A water quality testing and sampling device for a water conservancy project, comprising a sampling cylinder (10), wherein a sampling port (11) is provided at the lower end of the sampling cylinder (10), and a piston (20) that can slide up and down is provided inside the sampling cylinder (10) and a limiting structure that restricts the piston (20) to the extreme position of upward sliding, wherein a first pull rope (21) is fixedly connected to the piston (20), and the first pull rope (21) extends out from the upper opening of the sampling cylinder (10), characterized in that, The upper end of the sampling tube (10) is fixedly connected to a negative pressure hood (30) with the opening facing downward. The top of the negative pressure hood (30) is provided with an air hole (31). The outer side of the negative pressure hood (30) is elastically connected to a sealing member (40) for sealing the air hole (31). A second pull rope (41) is fixedly connected to the sealing member (40).

2. The hydraulic engineering water quality detection sampling device according to claim 1, characterized in that: A connecting pipe (32) is fixedly installed at the center of the negative pressure hood (30), and the upper end of the sampling cylinder (10) is threadedly connected to the connecting pipe (32).

3. The water conservancy project water quality detection sampling device according to claim 1 or 2, characterized in that: A filter structure is provided at the sampling port (11).

4. The hydraulic engineering water quality detection sampling device according to claim 3, characterized in that: The filter structure is a hemispherical shell-shaped filter screen (12).

5. The hydraulic engineering water quality detection sampling device according to claim 4, characterized in that: The filter screen (12) is detachably connected to the sampling cylinder (10) via a connecting structure.

6. The hydraulic engineering water quality detection sampling device according to claim 5, characterized in that: The connection structure is an annular connecting boss (13) fixedly installed at the lower end of the sampling cylinder (10), and the inner side of the opening of the filter screen plate (12) is provided with an internal thread that is threadedly engaged with the connecting boss (13).

7. The hydraulic engineering water quality detection sampling device according to claim 1 or 2, characterized in that: The piston (20) includes a piston head (200) and a piston rod (201). The piston head (200) is disposed inside the sampling cylinder (10). The lower end of the piston rod (201) is fixedly connected to the piston head (200). The upper end of the piston rod (201) extends to the outside of the sampling cylinder (10) and is fixedly provided with a first lifting ring (22). The first pull rope (21) is fixedly connected to the first lifting ring (22).

8. The hydraulic engineering water quality detection sampling device according to claim 2, characterized in that: An installation platform (33) is fixedly installed at the upper end of the connecting pipe (32). The sealing member (40) is movably installed through the installation platform (33). The upper end of the sealing member (40) is fixedly connected to the second pull rope (41). The lower end of the sealing member (40) is the sealing end (42). A spring (43) is installed between the sealing end (42) and the installation platform (33).

9. The water quality testing and sampling device for water conservancy projects according to claim 8, characterized in that: The upper end of the sealing member (40) is fixedly provided with a second lifting ring (44), and the second pull rope (41) is fixedly connected to the second lifting ring (44).

10. The water conservancy project water quality detection sampling device according to claim 8 or 9, characterized in that: The sealing end (42) has a sealing structure on the side that contacts the vent (31).

Images