Dust environment simulator and calibration method for dust concentration measuring instrument by using same

Abstract

The invention discloses a dust environment simulator and a calibration method for a dust concentration measuring instrument by using the same. The dust environment simulator comprises a dust generation unit, a simulation chamber and a test support, wherein the simulation chamber comprises a cylindrical mixing section, a concentrating section with a convergent lower end, a diffusing section with a flared lower end and a cylindrical test section, the sections are communicated from top to bottom, the bottom of the test section is provided with an air outlet, a dust outlet of the dust generation unit is communicated with the mixing section, the test support is installed in the test section, at least two disposition stations are arranged in a same horizontal plane on the test support, the test section is provided with an openable and closable observation door, and an air inlet is communicated with a air feeding fan or the air outlet is connected with an air exhausting fan. The dust environment simulator utilizes the vertically arranged simulation chamber for mixing, concentration and diffusion of dust and air-flow, enables dust to be uniformly distributed in the test section in the manner of free falling, allows difference of concentration of dust located at a same horizontal position in the test section to be reduced and is capable of increasing the calibration accuracy of a dust concentration tester.

Description

technical field [0001] The invention relates to a dust environment simulation device for simulating a dust environment, and at the same time, the invention relates to a method for calibrating a dust concentration measuring instrument by using the dust environment simulation device. Background technique [0002] Environmental simulation technology is a new edge technology, which mainly studies the artificial reproduction technology of various natural environments and the test technology of products in simulated environments; the ground environment simulation equipment mainly includes the following categories: low temperature environment simulation, high temperature environment simulation, damp heat Environmental simulation, solar radiation simulation, sand dust environment simulation, rain environment simulation, immersion simulation, acid environment simulation, explosive atmospheric environment simulation, icing / freezing rain environment simulation and mold environment simul...

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Problems solved by technology

[0003] 1. The above-mentioned dust simulation environment is only suitable for the simulation of dust environment with a relatively high concentration, but not suitable for the simulation of low-concentration dust, especially the dust concentration requirement of 0.01-20mg / m 3 : The reason is that if the micro dust is to be uniform in the wind tunnel, the wind speed cannot be fast, and if the wind speed is too slow, the dust will slowly deposit in the lower half of the wind tunnel due to its own gravity, causing the concentration of the same section of the wind tunnel to be inconsistent, so that Affect the calibration accuracy of the dust concentration measuring instrument

[0004] 2. The uniformity of the dust concentration in the above-mentioned dust simulation environment is very difficult to guarantee; since the flow direction of the air in the wind tunnel is horizontal, the horizontal force and vertical force exerted by the dust in the wind tunnel on the received horizontally flowing air will Gravity in the direction of gravity, then the resultant force received by the dust makes it very likely that the dust will deposit to the lower half of the wind tunnel when the air flow speed is slow;

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