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A pressurized air sampling device and sampling method thereof

A technology of air sampling and equipment, applied in the direction of sampling devices, etc., can solve the problem of increasing the actual sampling volume of the sampling tank, and achieve the effect of reducing the risk of sample contamination and increasing the actual sampling volume

Active Publication Date: 2020-06-05
CHINESE ACAD OF METEOROLOGICAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The invention provides a pressurized air sampling device and a sampling method thereof. The air sampling device pressurizes the sampling tank during sampling, greatly increases the actual sampling volume of the sampling tank, and solves the problem of air pollution in high altitude and low pressure environments. sampling problem

Method used

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  • A pressurized air sampling device and sampling method thereof
  • A pressurized air sampling device and sampling method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] The front structure diagram of the shell 1 of the pressurized air sampling device of the present embodiment is as follows figure 1 As shown, the shell 1 is arranged outside the pressurized air sampling equipment, and protects and supports the sampling exhaust system, safety system and switching air circuit device. The first sampling tank interface 5, the second sampling tank interface 6, the total air inlet 2, the total exhaust port 9, the pressure gauge 4, the first switching valve 3 and the second switching valve 8 of the sampling exhaust system and the safety system The knob and the knob of the pressure relief valve 7 are arranged on the front of the shell 1 .

[0059] The overall structure schematic diagram of the pressurized air sampling equipment of the present embodiment is as follows figure 2 As shown, the power plug 16 and the power switch 15 of the air sampling device are arranged on the back of the casing 1 , the power plug 16 is connected to an external po...

Embodiment 2

[0068] Embodiment 2 sampling method

[0069] The pressurized air sampling device of the present embodiment is the pressurized air sampling device of embodiment 1, and air samples are collected at an altitude of 4700 meters. The specific sampling method includes the following steps:

[0070] (1) Open the knob of the pressure relief valve 7 to quickly balance the pipeline of the pressurized air sampling device with the ambient air pressure on site, and then close the pressure relief valve 7;

[0071] (2) The first switching valve 3 is communicated with the first air inlet A and the first exhaust port C, and the second switching valve 8 is communicated with the third air inlet C1 and the third exhaust port B1;

[0072] (3) Connect the power plug 16, turn on the power switch 15, and start the vacuum pump 12;

[0073] (4) The air at the sampling site enters the vacuum pump 12 through the total air inlet 2, the first air inlet A of the first switching valve 3, the first exhaust por...

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Abstract

The invention provides a pressurization type air sampling device and a sampling method thereof. The air sampling equipment comprises a sampling and air exhausting system, a safety system and an air path switching device; the sampling and air exhausting system comprises at least one sampling tank, at least one sampling tank interface, a main gas inlet, a main exhaust port and a vacuum pump; the sampling tanks are connected with the sampling tank interfaces respectively; the air path switching device comprises a first switching valve and a second switching valve; the main air inlet and the sampling tank interfaces are connected with a vacuum pump air extracting port through the first switching valve; a vacuum pump air outlet is connected with the sampling tank interfaces and the main exhaustport through the second switching valve; the safety system comprises a pressure relief valve and a safety valve; the safety valve is connected to an air path between the air outlet of the vacuum pumpand the second switching valve; the pressure relief valve is connected to an air path between the sampling tank interface and the second switching valve; and the air suction and air exhausting of thesampling tank are realized through the air path switching device.

Description

technical field [0001] The invention belongs to the technical field of air sampling, and in particular relates to a pressurized air sampling device and a sampling method thereof. Background technique [0002] In the field of atmospheric volatile organic compounds detection, sampling tanks are usually used to collect ambient air samples. In the prior art, before collecting air samples, the sampling tank is cleaned and vacuumed on equipment such as a tank cleaner, that is, the inside of the sampling tank is in a vacuum state before use, and the negative pressure in the sampling tank is used to suck the ambient air into the sampling tank during sampling . The amount of sample collected by this method is limited by the volume of the sampling tank and the size of the ambient air pressure. It is difficult in the application of large sample volume or multiple injection analysis tests, and it is not suitable for low ambient air pressure in high altitude areas. occasional sampling....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/24
CPCG01N1/24
Inventor 王瑛徐晓斌
Owner CHINESE ACAD OF METEOROLOGICAL SCI