Tube orifice diameter variable spliced sampling instrument

Abstract

The invention relates to a tube orifice diameter variable spliced sampling instrument which structurally comprises a steady flow buffer tube for receiving a pumped polluted water sample and performing steady flow conveying on the polluted water sample, a pump tube connection mechanism connected with a polluted water sample output pump tube, a diversion pressure regulating valve for regulating water flow pressure of the polluted water sample, a pressure gauge for detecting the water flow pressure, a sampling hose leading the polluted water sample under a laminar condition out of the steady flow buffer tube via a streamline water outlet for water sampling, and a concentric flow regulator for regulating a flow rate of the collected water sample. The instrument changes the composition, the structure and the operating principle of the original organic polluted water sampling device, has the characteristics of small size, light weight, wide application scope, convenience in carrying and mounting, simplicity in operation, safety in use, prevention of a pollution link in a collection process of the sample and the like, improves the fidelity of the collected sample, lowers the collecting cost of the sample, and ensures the safety of personnel and equipment, and the universality of the sampling instrument is improved.

Description

technical field [0001] The invention relates to a collection device for water samples containing volatile and semi-volatile substances, in particular to a plug-in sampler with a variable diameter nozzle. Background technique [0002] Due to the particularity of volatile and semi-volatile substances contained in water samples polluted by organic matter, the collection of samples is different from other water samples. [0003] At present, the commonly used method of collecting water samples contaminated by organic matter is to fasten the fire hose with a hose clamp at the mouth of the pump pipe where the contaminated water sample is taken, and then collect the sample through the four-way diversion method. The sampling components used mainly include sample collection four-way, four-way diverter, lined fire hose, hose clamps, large and small pipe joints, straight pipes, quick-connect snap rings, pressure gauges, socket-type connection towers, and pressure regulating valves , di...

AI Technical Summary

Problems solved by technology

[0007] (1) Fire hoses, transparent pressure-resistant plastic hoses, raw material belts, etc. used in the sample collection device are likely to contaminate the samples and distort the samples; especially during the first few times of use, the harmful components released by the materials used have a negative impact on the samples. The quality of the sample can have a big impact, contaminating the sample

[0008] (2) The sample collection device has many parts and complex structure, with a total weight of more than 80kg, which is bulky and inconvenient to carry

[0009] (3) On-site assembly procedures are complex, cumbersome and time-consuming

Some parts adopt American standard, which is not conducive to the connection between each other, and the operation is inconvenient

[0010] (4) Cavitation is prone to occur at the turning and variable diameter parts of the sample collection four-way and the sample flowing through the pipeline. When the vacuum in the cavitation is greater than the saturated vapor pressure of some volatile substances or semi-volatile substances in water , which will cause the overflow and loss of these volatile or semi-volatile substances, which will distort the sample

[0012] (6) When the head or power of the pump is large, the discharge valve installed on the head of the fire hose will swing left and right due to the reaction force of the water outlet from the nozzle. If the control is not firm, it will pose a threat of impact to the operator and surrounding objects

[0013] (7) The maximum size of the suction pump nozzle that the sample collection device can be connected to is DN100. For pump pipes larger than this size on site, sampling operations cannot be performed because they cannot be connected.

[0016] The sample error is too large, which sometimes leads to conclusions that the evaluation results are diametrically opposed to the actual situation

If the sample collection process causes the pollutants in the sample to overflow and lose more, resulting in a lower indoor detection value than the actual value, it is possible to evaluate the polluted waters as unpolluted or lightly polluted waters, and the pollution is not taken seriously. Continuing to use it in production and life will eventually increase the degree of pollution and directly affect the quality of life of the people. Long-term use in production, living and drinking will cause physical damage to the people and directly affect the healthy development of the national economy.

[0017] During the sample collection process, the water sample is subject to improper use of the sampler material, which increases the content of pollutants in the sample, making the indoor detection value higher than the actual value, and it is possible to classify the unpolluted or lightly polluted area as Areas that are polluted or heavily polluted, on the one hand, waste the cost of treatment, and on the other hand, affect the mood of the people who do not know the truth, which is not conducive to social stability

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