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Intelligent constant-flow individual air dust sampler and constant-flow control method

An air dust and sampler technology, applied in the direction of using electrical device flow control, instruments, sampling devices, etc., can solve the problem that feedback control, automatic compensation and correction cannot be realized, rotameter cannot provide electrical signal output, and cannot form a closed-loop control system. and other problems, to achieve the effect of small resistance, convenient production and convenient wearing

Active Publication Date: 2010-10-13
武汉碧海云天科技股份有限公司
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  • Application Information

AI Technical Summary

Problems solved by technology

The other is to use a rotameter for measurement. The rotameter cannot provide electrical signal output, cannot realize feedback control, automatic compensation and correction, and cannot constitute a closed-loop control system.
If a conventional orifice flowmeter is used, in the low flow range of the instrument, there are deficiencies such as low accuracy, low resolution, and large air path resistance. Mass flow sensors also have the disadvantages of large air path resistance and high cost.
Existing individual samplers, due to the pulsation of the air pump, produce airflow spikes. When comparing the flow with other flowmeters, due to the fluctuation of the airflow, it is not easy to compare the readings

Method used

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Embodiment Construction

[0038] The present invention will be further described below in conjunction with accompanying drawing. figure 1 , 4Among them, the intelligent constant-flow individual air dust sampler includes a sampling head and an instrument shell, and an intake filter 1, an air pump 3, an air chamber 5, a single-chip microcomputer 7, a battery, and an intake filter 1 are arranged in the instrument shell. The sampling head connected to the air port is equipped with a filter membrane for collecting dust, and its characteristics are: the sampler is also provided with a buffer gas capacity 2, a gas capacity 4, and a flow closed-loop control circuit 16; the gas chamber 5 is provided with an orifice connection Nozzle 5-1, orifice plate 5-2, orifice plate seat 5-3, air chamber diaphragm 5-4, pressure measuring port 5-7 and differential pressure sensor 6; the test end of differential pressure sensor 6 passes through the hose It is connected with the pressure measuring port 5-7 on the gas chamber...

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Abstract

The invention discloses an intelligent constant-flow individual air dust sampler and a constant-flow control method. The sampler is provided with a buffering air capacitor (2), an air capacitor (4), a flow closed-loop control circuit (16), pressure measuring openings (5, 6 and 7) and a differential pressure sensor (6), wherein the test end of the differential pressure sensor (6) is communicated with the pressure measuring opening on an air chamber (5) through a hose; the signal output end of the differential pressure sensor (6) is connected with an input port of a singlechip (7) through an amplifier and an A / D converter; and the output control end of the singlechip is connected with the electrical signal control end of the driving motor of an air pump (3) through an air pump control unit (19). The constant-flow control method comprises: a, establishing a flow correction curve; b, testing the backpressure of working gas at the outlet of the air chamber (5); and c, comparing a measured current backpressure with the flow curve and controlling the air pump (3) to implement constant-flow output. The sampler and the method can realize flow closed-loop control and automatic constant-flow sampling, improve the accuracy of dust mass concentration measurement and ensure reliable use and accurate control.

Description

technical field [0001] The invention relates to a monitoring instrument for labor protection, sanitation and epidemic prevention, in particular to an intelligent constant-flow individual air dust sampler for monitoring the concentration of various harmful gases and dust. Background technique [0002] Dust samplers are widely used in labor protection, health and epidemic prevention departments, and are used to monitor various harmful gases and dust concentrations. In environmental protection, metallurgy, building materials, chemical industry, occupational disease prevention and other industries, dust samplers are usually used to evaluate the environment of dusty workplaces, to measure the impact of dust in a working class on human health, and to study the prevention and control of occupational diseases. , production environment, equipment transformation to provide a theoretical basis. The method of dust sampler to measure the mass concentration of dust in the air is the grav...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/14G01N5/00G01N15/06G05D7/06
Inventor 杨乐群周前进孙友华王志刚刘立明
Owner 武汉碧海云天科技股份有限公司
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