Constant flow gas sampling device with solid absorbent tubes and method

Abstract

The invention relates to the field of environment-friendly equipment, and discloses a constant flow gas sampling device with solid absorbent tubes and a constant flow gas sampling method. The device comprises a cabinet, a miniature motor, a circular tray and a plurality of telescopic support rods. A top plate of the cabinet is provided with a through hole. The miniature motor is arranged in the cabinet, and a motor shaft of the miniature motor runs through the through hole. The center of the circular tray is provided with a non-circular hole. The motor shaft runs through the through hole, andthe end part of the motor shaft is fixed with the non-circular hole. A plurality of supporting wheels are arranged between the circular tray and the top plate of the cabinet, and are used for supporting the circular tray on the top plate of the cabinet. The plurality of telescopic support rods are uniformly distributed at positions, close to an edge, on the upper part of the circular tray. The tops of each telescopic support rod are provided with a mounting bracket respectively. At least one solid absorbent tube is arranged on the mounting bracket, and is provided with a gas inlet and a gas outlet. The solid absorbent tubes are arranged horizontally. The device provided by the invention can rapidly, effectively and automatically regulate a gas sampling flow to always keep the gas samplingflow at a flow value preset before the sampling is started, thereby fulfilling the aim of simultaneous constant flow sampling of the plurality of solid absorbent tubes.

Description

technical field [0001] The invention relates to the technical field of environmental protection equipment, in particular to a gas constant flow sampling device and method with a solid adsorbent tube. Background technique [0002] In the prior art, the main principle of the indoor air sampler is to extract samples with a sampling pump, and adopt different flow stabilization measures and synchronous timing methods to achieve quantitative collection of gaseous or steam samples in the gas for analysis of harmful components and average concentration. The existing gas sampler is mainly composed of a diaphragm pump, a regulating valve, a buffer bottle, a flow meter, an electronic time control circuit, an undervoltage indicating circuit and a power supply. The deficiencies of existing gas samplers are mainly: 1. The use of diaphragm pumps leads to the flow of gas one by one instead of continuous flow, which eventually leads to inaccurate total flow under the total time accumulation...

AI Technical Summary

Problems solved by technology

The deficiencies of existing gas samplers are mainly: 1. The use of diaphragm pumps leads to the flow of gas one by one instead of continuous flow, which eventually leads to inaccurate total flow under the total time accumulation ;2. The material used for the diaphragm pump or flow adjustment device of the sampler will deform when the temperature changes, causing changes in the flow rate; 3. The required gas flow cannot be set before starting, but the rotameter can be manually adjusted after starting To set the required flow rate, there will be some errors. In addition, the flow rate changes during the sampling process and cannot be automatically adjusted to keep the flow rate constant; 4. Diaphragm pumps, buffer bottles and temperature control devices make the sampler expensive and bulky Larger and not easy to carry; 5. Only one solid adsorbent tube can be used. If a solid adsorbent tube is added, corresponding pumps, flow meters, buffer bottles, etc. will also be added at the same time, which will increase the cost and volume accordingly and weight

Images