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Portable air sampler with wide range

An atmospheric sampling and wide-range technology, applied in instruments, scientific instruments, sampling, etc., can solve the problem of limited gas flow range and achieve the effect of ensuring flow

Pending Publication Date: 2019-02-19
SHENZHEN AMAE INSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the orifice diameter of the gas inflow section is constant, the gas flow range measured within the effective range of the differential pressure flowmeter is very limited

Method used

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  • Portable air sampler with wide range
  • Portable air sampler with wide range
  • Portable air sampler with wide range

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Embodiment Construction

[0023] Embodiments of the present invention will now be described with reference to the drawings, in which like reference numerals represent like elements. As mentioned above, such as figure 1 , 2 , 3, the portable wide-range atmospheric sampling instrument 100 provided by the embodiment of the present invention includes: a vertically arranged sampling pipeline 1 and a main flow channel 2 and a bypass flow channel 3 arranged on the sampling pipeline 1, the The upper end of the sampling pipeline 1 is used to form a sampling air inlet, and the inside is a hollow structure, and the lower end is connected with the centrifugal fan 4. The main flow channel 2 and the bypass flow channel 3 are all arranged on the sampling pipeline 1. The main flow channel 2 includes: an orifice 5 transversely penetrating the two side walls of the sampling pipeline 1, and an adjustment shaft 6 sealingly pierced on the orifice 5, and the adjustment shaft 6 is provided along the length direction. Three...

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Abstract

The invention discloses a portable air sampler with a wide range, which comprises a sampling tube, and a main flow channel and a bypass flow channel which are provided on the sampling tube. The upperend of the sampling tube is used to form an air sampling inlet, the inner part thereof is a hollow structure, and the lower end thereof is connected with a centrifugal fan. The main flow channel and the bypass flow channel are provided on the sampling tube. The main flow channel comprises an orifice penetrating through two side walls of the sampling tube, and an adjusting shaft sealingly passing through the orifice. A plurality of venting grooves with different sizes extending through the outer wall of the adjusting shaft are arranged along the length direction. The space, located above and below the adjusting shaft, of the sampling tube forms a sampling air flow channel through the venting grooves. The bypass flow channel is provided on the lower side of the main flow channel and is connected into the sampling tube, and supply air volume entering the centrifugal fan when the sampling air flow channel is too small. The invention is a portable air sampler with a wider flow range.

Description

technical field [0001] The invention relates to the technical field of air monitoring, in particular to a portable high-precision wide-range air sampling instrument with a wider flow range. Background technique [0002] Generally, in the ambient air sampler of the prior art, the rotational speed of the adjustable-speed centrifugal fan is positively correlated with the gas flow rate during operation, and is also positively correlated with the suction negative pressure. The greater the speed of the fan, the greater the flow of gas passing through the fan; if the flow is small at this time, but the negative pressure is large, the fan still needs to run at a high speed. The motor driver driving the fan has a minimum starting speed, which corresponds to the minimum flow of the fan, and the fan cannot start when the flow is lower than the minimum flow. When the sampling flow rate is small, the fan works near the starting voltage, and the speed fluctuates greatly or has no speed. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/22
CPCG01N1/2273
Inventor 陈军王旭蓝权明苏琴郭冰
Owner SHENZHEN AMAE INSTR
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