Twin channel PM2.5 detection device

Abstract

The invention discloses a twin channel PM2.5 detection device. An air channel shell is arranged on the back of a PCB, a shell and the air channel shell are integrally molded in an injection molding manner, the air channel shell is divided into an inner channel and an outer channel, the inner channel and the outer channel are independently arranged, a laser detection module and a heating resistor are arranged in each of the inner channel and the outer channel, an in-vehicle acquisition channel is connected with the inner channel, an outside acquisition channel is connected with the outer channel, the air channel shell is provided with an air outlet which is shared by the inner channel and the outer channel, a fan is arranged on the back of the PCB, an MCU and a temperature sensor are arranged on the PCB, and the laser detection modules, the heating resistors, the fan and the temperature sensor are respectively in communication connection with the MCU. The twin channel PM2.5 detection device disclosed by the invention is used for detecting air quality inside and outside a vehicle, air quality and environmental state around a user are detected, the inner channel and the outer channelare independently designed, a real-time detection function is realized by virtue of one fan, and a condensate removal structure is added inside each channel, so that the twin channel PM2.5 detection device removes condensed water by virtue of the heating resistors under a low temperature working condition.

Description

technical field [0001] The invention belongs to the technical field of PM2.5 detection, and in particular relates to a dual-channel PM2.5 detection device. Background technique [0002] Fine particulate matter is also called fine particles, fine particles, PM2.5. Fine particulate matter refers to particulate matter in the ambient air with an aerodynamic equivalent diameter less than or equal to 2.5 microns. It can be suspended in the air for a long time, and the higher its concentration in the air, the more serious the air pollution. As people's requirements for air quality are getting higher and higher, especially those who are allergic to air dust, suffering from respiratory diseases, etc., people increasingly hope to be able to clearly grasp the air quality of personal space, especially often Air quality inside the used car cabin. [0003] Publication number CN207816771U discloses a vehicle-mounted dual-channel PM2.5 detection device, which has many limitations in te...

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Problems solved by technology

[0003] Publication number CN207816771U discloses a vehicle-mounted dual-channel PM2.5 detection device, which has many limitations in technology, and the product is large in size (basic size: 85*65*63mm), and there are great space limitations in the layout of the vehicle. It is not conducive to installation; the detection cycle is long, which is controlled by a stepping motor, and the damper is cyclically switched at the inner and outer channel ports. A detection cycle takes 40s (20s for the inner channel and 20s for the outer channel), which greatly reduces the detection efficiency; at -0°C When working, due to the temperature difference inside and outside the car, condensation water will appear inside the product, and the laser detection module cannot distinguish between fog and haze, resulting in distortion of the detection value. In a low-concentration environment, the product will explode. Maintenance, PM2.5 sensor is in the process of detecting air quality, and at the same time, the tiny particles in the air will accumulate dust for a long time, resulting in a decrease in detection accuracy and a reduction in the service life of the product

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