Negative pressure sampler

Abstract

The utility model provides a negative pressure sampler capable of collecting liquid, powder and small particles and automatically sealing and storing collected samples. The negative pressure sampler comprises a collecting pipe, the lower end of the collecting pipe is communicated with an air inflow pipe, and the air inflow pipe is provided with a one-way valve capable of enabling fluid to enter the collecting pipe; the upper end of the collecting pipe is communicated with the lower end of a floating ball pipe; the upper end of the floating ball pipe is communicated with the lower end of a solid particle filtering device; the upper end of the solid particle filtering device is communicated with an air guide pipe; a floating ball capable of floating on the liquid level is arranged in the floating ball pipe, a sealing seat is arranged in the floating ball pipe above the floating ball, and a flow channel for communicating the lower end and the upper end of the floating ball pipe is formed in the sealing seat; air is exhausted from the air guide pipe, so that negative pressure is formed in the solid particle filtering device,the floating ball pipe and the collecting pipe, the one-way valve is opened, when the liquid gradually enters the floating ball pipe through the air inflow pipe and the collecting pipe, the floating ball floats up in the floating ball pipe and gradually rises until the floating ball is in sealing contact with the sealing seat, the flow channel is blocked, and the lower end and the upper end of the floating ball pipe are not communicated with each other.

Description

technical field [0001] This patent relates to a device for sampling liquid, dust, fine particles, etc. Background technique [0002] In the first half of the 21st century, there are many real threats to nuclear, biological and chemical threats facing the world, and they are diversified. There are traditional threats, such as nuclear, biological and chemical warfare, and nuclear, biological and chemical deterrence; there are also non-traditional threats, such as nuclear, biological and chemical proliferation, nuclear Biochemical terror, secondary nuclear, biological and chemical disasters, nuclear, biological and chemical industrial accidents, biological epidemics, etc. Most of the nuclear, biological and chemical threats have the same characteristics, that is, large-scale and short-term damage to human and animal life and the effect of damaging the environment. They have many means, high concealment, low implementation cost, and difficult protection. They are a major concern...

AI Technical Summary

Problems solved by technology

Due to the particularity of the hazard factors of nuclear, biological and chemical incidents, the scientific and safe collection of samples is the focus. For the collection of liquids and powders, there are currently no particularly ideal tools and means

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