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CN-121977891-A - Water pollution monitoring sampling device

CN121977891ACN 121977891 ACN121977891 ACN 121977891ACN-121977891-A

Abstract

The invention discloses a water pollution monitoring and sampling device, and belongs to the technical field of water environment pollution monitoring. The device comprises a sampling cylinder body, a floating piston, a piston rod assembly, a hydraulic triggering assembly and a sealing cover body. The floating piston is sealed in the cylinder in a sliding way, the top piston is arranged in the cavity in the floating piston, the bottom piston linked with the top piston is also arranged in the cylinder, and an oil storage cavity is formed between the floating piston and the bottom piston. The hydraulic trigger assembly is connected with the oil delivery pipe through the oil delivery pipe the oil outlet on the side wall of the cylinder body is communicated. The hydraulic pressure in the lowering process is utilized to push the bottom piston to move upwards, the incompressibility of hydraulic oil in the oil storage cavity is utilized to drive the floating piston to synchronously rise, when the target depth is reached, the oil outlet is opened, high-pressure oil is injected into the hydraulic triggering assembly to enable the sealing cover body to spring open for sampling, water is introduced after sampling to push the top piston to move downwards relatively, the volume of the oil storage cavity is increased to form negative pressure, and the oil is sucked backwards to enable the sealing cover body to reset automatically.

Inventors

  • Nie Mingjing

Assignees

  • 中检(重庆)检测评价技术服务有限公司

Dates

Publication Date
20260505
Application Date
20260305

Claims (9)

  1. 1. The water pollution monitoring and sampling device comprises a sampling cylinder (100) which is of a cylindrical structure with an upper opening and a lower opening, and is characterized by further comprising: a floating piston (200) which is arranged in the sampling cylinder body (100) in a sliding and sealing way, an axial cavity is arranged in the floating piston, and an opening (210) communicated with the cavity is arranged at the top of the floating piston; A piston rod assembly (300) comprising a top piston (310), a bottom piston (330) and a strut (320) connecting the two, wherein the top piston (310) is slidably sealed in an axial cavity of the floating piston (200), and the bottom piston (330) is slidably sealed on the inner wall of the sampling cylinder (100) and is positioned below the floating piston (200); Wherein, the bottom surface of the floating piston (200) and the top surface of the bottom piston (330) are enclosed to form an oil storage cavity (700), and hydraulic oil is stored in the oil storage cavity (700); the hydraulic triggering assembly (400) comprises a hydraulic oil cylinder (410) fixed on the inner wall of the sampling cylinder body (100) and a hydraulic rod (420) matched with the hydraulic oil cylinder (410), wherein an internal cavity of the hydraulic oil cylinder (410) is communicated with an oil outlet (120) formed in the side wall of the sampling cylinder body (100) through an oil conveying pipe (130); And the sealing cover body (500) is fixedly connected with the top end of the hydraulic rod (420) and is used for sealing the top opening of the sampling cylinder body (100).
  2. 2. The water pollution monitoring sampling device according to claim 1, wherein the oil outlet (120) is provided at a predetermined height position of a side wall of the sampling cylinder (100), and an outer side wall of the floating piston (200) selectively closes or opens the oil outlet (120) during sliding.
  3. 3. The water pollution monitoring sampling device of claim 1, further comprising at least one air reservoir (600), the air reservoir (600) being in communication with a cavity inside the sampling cylinder (100) above the floating piston (200).
  4. 4. The water pollution monitoring and sampling device according to claim 1, wherein a limit ring (110) for limiting the downward limit position of the bottom piston (330) is fixedly arranged on the inner wall of the bottom of the sampling cylinder (100).
  5. 5. The water pollution monitoring sampling device according to claim 1, characterized in that the height H of the floating piston (200) cooperates with the axial position of the oil outlet (120) such that the sampling device slides to a position where the oil outlet (120) is opened at a water pressure P of a predetermined water depth.
  6. 6. The water pollution monitoring and sampling device according to claim 1, wherein the diameter of the top piston (310) is slightly smaller than the inner diameter of the axial cavity of the floating piston (200) and slightly larger than the diameter of the opening (210), and self-lubricating sealing rings are arranged on the outer walls of the top piston (310), the bottom piston (330) and the floating piston (200).
  7. 7. The water pollution monitoring and sampling device according to claim 1, wherein the hydraulic triggering components (400) are at least two groups and symmetrically arranged on the inner wall of the sampling cylinder (100).
  8. 8. The water pollution monitoring sampling device of claim 1, wherein in an initial state, a bottom surface of the top piston (310) is in contact with a bottom surface of the internal cavity of the floating piston (200).
  9. 9. The water pollution monitoring sampling device according to claim 1, characterized in that in an initial state the inside of the sampling cylinder (100) is in a cavity above the floating piston (200), pre-filled with a chemically inert shielding gas.

Description

Water pollution monitoring sampling device Technical Field The invention relates to the technical field of water environment pollution monitoring, in particular to a water pollution monitoring sampling device. Background In water environment pollution monitoring, accurately collecting undisturbed water samples with different depths is a precondition for analyzing the vertical pollution distribution of a water body, researching the delamination of dissolved oxygen and detecting the release of sediment. Conventional water samplers, such as inverted water samplers or southern son bottles, typically rely on an auxiliary sinker down the wire rope to trigger the inversion or closure of the water collection bowl. The triggering mode has the defect of low triggering reliability, and sampling failure is easy to cause. Another common organic glass water sampler is simple to operate, but a water sample penetrates through a cylinder in the process of lowering, so that the accurate sealing of a specific water layer cannot be realized, the collected water sample is often a water body mixed in the process of ascending, and the water sample cannot represent an in-situ water layer. The existing electric or electromagnetic valve controlled multichannel water sampler has the defects of high precision, complex structure, high cost or poor applicability in remote water areas or non-electric field environments because of external power supply. Therefore, there is a need for a sampling device that can be automatically triggered by the depth of water pressure, is simple and reliable in structure, and can be automatically sealed after sampling. Disclosure of Invention The invention aims to provide a water pollution monitoring sampling device, which aims to solve the technical defects that the existing sampler is unreliable in triggering, cannot accurately perform layered sampling and has a complex structure. In order to solve the technical problems, the technical scheme provided by the invention is that the water pollution monitoring sampling device comprises a sampling cylinder body which is of a cylindrical structure with an upper opening and a lower opening, and further comprises: the floating piston is arranged in the sampling cylinder in a sliding and sealing manner, an axial cavity is formed in the floating piston, and an opening communicated with the cavity is formed in the top of the floating piston; The piston rod assembly comprises a top piston, a bottom piston and a supporting rod for connecting the top piston and the bottom piston, wherein the top piston is sealed in an axial cavity of the floating piston in a sliding manner; the bottom surface of the floating piston and the top surface of the bottom piston are enclosed to form an oil storage cavity, and hydraulic oil is stored in the oil storage cavity; The hydraulic triggering assembly comprises a hydraulic oil cylinder fixed on the inner wall of the sampling cylinder body and a hydraulic rod matched with the hydraulic oil cylinder, wherein a cavity in the hydraulic oil cylinder is communicated with an oil outlet arranged on the side wall of the sampling cylinder body through an oil delivery pipe; and the sealing cover body is fixedly connected with the top end of the hydraulic rod and is used for sealing the top opening of the sampling cylinder body. In some embodiments of the invention, the oil outlet is disposed at a predetermined height of the sampling cylinder side wall, and the outer side wall of the floating piston selectively closes or opens the oil outlet during sliding. In some embodiments of the invention, at least one air reservoir is further included, the air reservoir being in communication with a cavity within the sampling cylinder above the floating piston. In some embodiments of the present invention, a limiting ring for limiting the downward limit position of the bottom piston is fixedly arranged on the bottom inner wall of the sampling cylinder. In some embodiments of the invention, the height H of the floating piston cooperates with the axial position of the oil outlet such that the sampling device slides to a position that opens the oil outlet at a water pressure P of a predetermined water depth. In some embodiments of the invention, the diameter of the top piston is slightly smaller than the inner diameter of the axial cavity of the floating piston and slightly larger than the diameter of the opening, and self-lubricating sealing rings are arranged on the outer walls of the top piston, the bottom piston and the floating piston. In some embodiments of the present invention, the hydraulic triggering assemblies are at least two groups, and are symmetrically arranged on the inner wall of the sampling cylinder. In some embodiments of the invention, in an initial state, a bottom surface of the top piston is in contact with a bottom surface of the interior cavity of the floating piston. In some embodiments of the invention, in an initial state, the inte