Sampler for underground water at fixed depth

Abstract

The invention discloses a sampler for underground water at a fixed depth. The sampler sequentially comprises at least two connecting pipes, a sampling base pipe and a one-way water stop device from top to bottom, wherein the sampling base pipe and the connecting pipes are detachably fixed to form an interpenetrating sampling cavity; the sampling base pipe is communicated with the one-way water stop device through a sleeve type telescopic joint; the one-way water stop device comprises a funnel and a funnel bushing; the upper end of the telescopic joint and the lower end of the sampling base pipe are hermetically fixed; the lower end of the telescopic joint is in threaded connection with the funnel bushing; the funnel is arranged in the space formed by the funnel bushing and the telescopic joint; the lower part of the funnel extends out of the funnel bushing, and the upper end part of the funnel is clamped with the interior of the funnel bushing; and the funnel is tightly sealed with thelower edge of the funnel bushing. During sampling, the funnel moves upward by virtue of the thrust force of water, and the funnel is separated from the lower edge of the funnel bushing to form a water inlet channel; and when the sampling is finished, the sampler is lifted, and the funnel moves downward and is tightly sealed with the funnel bushing to reach a water stop state. The sampler is simple in structure, diverse in sampling mode, convenient to carry, easy to operate, high in controllability and capable of sampling water at the fixed depth.

Description

technical field [0001] The invention relates to the technical field of environmental pollution control, in particular to a multifunctional groundwater depth-fixing sampler. Background technique [0002] The collection of groundwater samples is a key task in the practice of site investigation and evaluation. In the groundwater investigation process, groundwater pollutants include organic pollutants and inorganic pollutants, and organic pollutants include heavy non-aqueous phase pollutants and light non-aqueous phase pollutants. Accurately collecting groundwater samples within a specified depth range is conducive to accurately determining the degree of groundwater pollution, so as to scientifically carry out groundwater pollution assessment. [0003] When the existing groundwater sampler is collecting groundwater, one or several unfavorable factors are highlighted, which affect the collection of groundwater samples, including: 1. During the groundwater collection process, due...

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Problems solved by technology

[0003] When the existing groundwater sampler collects groundwater, one or several unfavorable factors are highlighted, which affect the collection of groundwater samples, including: 1. During the groundwater collection process, due to the material problem of the sampling device, some organic pollutants stick to the sampling device 2. During the process of transferring the collected groundwater from the sampling device to the sample bottle, due to the splash of liquid or the violent disturbance during the water release process, some volatile organic compounds in the groundwater will be lost due to the escape and loss of the sample, which will affect the quality of the sample. 3. The length of the existing sampler is fixed, and the collected samples cover a single depth range, and the sampling depth span cannot be adjusted flexibly. Most of the existing samplers are sampling tubes with a length close to one meter, which is easy to cause a large span depth (such as depth Span up to 1 meter) sample mixing; 4. Most of the existing sampling devices are disposable sampling devices, which cannot be reused and easily cause waste

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