Gas constant current sampling apparatus with miniatured sampling head and method

Abstract

The invention relates to the field of environmental protection equipment, and discloses a gas constant current sampling apparatus with multiple miniatured sampling heads and a method. Included are a cabinet, a casing carrier plate with a through hole, a micromotor, which is arranged in the cabinet, and a motor reel which passes through the through hole. A circle tray is equipped with a non-circular hole; an end of the motor reel passing through the through hole is fixed with the non-circular hole; and a plurality of supporting wheels are arranged between the circle tray and the casing carrierplate to support the circle tray on the casing carrier plate. A plurality of telescopic support bars are uniformly uniform distributed on the circle tray and near an edge of the circle tray; each telescopic support bar is equipped with a holder on top; the support bar is equipped with a miniatured sampling head which has horizontally arranged air intake and gas outlet. The apparatus of the present invention can rapid and effectively automatically adjust a flow of gas gathering and maintain a flow value preset before starting, so as to realize simultaneous sampling of multiple sampling heads.

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 miniature sampling head. Background technique [0002] In the prior art, the main principle of the indoor particle sampler is to draw samples with a sampling pump, and adopt different flow stabilization measures and synchronous timing methods to realize quantitative collection of particulate matter in the atmosphere, so as to analyze the average concentration of particulate matter within a certain period of time. The existing particle sampler is mainly composed of a diaphragm pump, a regulating valve, a buffer, a flow meter, an electronic time control circuit, an undervoltage indicating circuit and a power supply. The deficiencies of existing atmospheric particle samplers are mainly as follows: 1. The use of diaphragm pumps causes the gas flow mode to be one by one, rather than continuous flow, which...

AI Technical Summary

Problems solved by technology

The deficiencies of existing atmospheric particle samplers are mainly as follows: 1. The use of diaphragm pumps causes the gas flow mode to be one by one, rather than 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 rate cannot be set before starting, but the float flow rate can be manually adjusted after starting The meter is used to set the required flow rate, so there will be certain 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 lead to expensive samplers and low volume Larger and not easy to carry; 5. If you want to monitor particles of different particle sizes or analyze the composition of particles at the same time, you need to add several sampling heads, and correspondingly increase pumps, flow meters, buffer bottles, etc., that is, the corresponding increase Cost, Size and Weight

Images