Self negative pressure airtight air extracting device

Abstract

The invention discloses a self negative pressure airtight air extracting device. The device is characterized by comprising a sealing cylinder, a cylinder cover, a clamping plate, a positioning lock ring, connectors, a switching valve, a rotary closed valve, an air pressure measuring display device, a gas collecting bag, an electric air pump and a gas pipe; the connectors are installed on the sideface of the sealing cylinder and the upper face of the cylinder cover, the connector on the side face of the sealing cylinder is connected with the electric air pump, two connectors are arranged on the upper face of the cylinder cover, the switching valve is installed on the upper face of one connector, the other connector is connected with the gas collecting bag in the sealing cylinder through the gas pipe rotary closed valve, the exteriors of the two connectors are mutually connected through the gas pipe, the clamping plate is installed on and fixed to the edge of the upper face of the cylinder cover, the positioning lock ring is installed on and fixed to the outer side of a cylinder opening formed in the upper end of the sealing cylinder, the positioning lock ring is matched with the clamping plate, and the air pressure measuring display device is installed on the outer side face of the sealing cylinder. The device is good in overall sealing property, capable of storing and taking gas samples of different types, good in anti-leakage, convenient to use, rapid in sample taking speed, and suitable for being used in the environmental protection field or a scientific laboratory.

Description

Technical field [0001] The invention relates to the field of air-tight air-pumping devices, in particular to a self-negative pressure air-tight air-pumping device. Background technique [0002] With the continuous development of society, my country's environmental pollution situation has deteriorated sharply. Among them, air pollution has been particularly prominent in recent years. At present, my country's large and medium-sized cities with relatively rapid economic development have an increasing frequency of smog each year. Smog is caused by air pollution, in order to solve the problem of smog. We must first start with air pollution, research and test the components of related pollutants or polluting gases in the atmosphere. Therefore, it is necessary to accurately collect or obtain gas samples to facilitate subsequent in-depth research on gas samples. However, the traditional gas sampling method has the following problems: 1. For the sampling of corrosive and contaminated ...

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Problems solved by technology

However, the traditional gas sampling method has the following problems: 1. For the sampling of corrosive polluted gas, the sampled gas leaks often occur, which often leads to inaccurate measurement in subsequent testing experiments; 2. The gas samples taken are prone to secondary leakage Or secondary pollution occurs; 3. There is no self-negative pressure and open and close valve device at any time, so that the detection requirements of self-negative pressure exhaust, open ventilation or close off gas can not be met when testing gas samples

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