A dust-removed odor sampling device for oil shale, comprising a dustproof chamber, a filter membrane, a single-chip microcomputer controller, a dust collection box, a solenoid valve I, an air pump, and a solenoid valve II, where the solenoid valve I, the dustproof chamber, the filter membrane, the single-chip microcomputer controller, the air pump, and the solenoid valve II are arranged sequentially from front to rear;
- the dustproof chamber is a three-way pipe, on which an air inlet channel, a diffusion channel, a dust settlement channel, a sensing channel and a dust collection channel are provided, an upper part of the sensing channel is provided with a jack I, a jack II, a jack III and a jack IV of a gas-sensitive sensor array;
- the air inlet channel is a circular cross-section straight pipe with an inner diameter d1=10-12 mm;
- the diffusion channel is an inclined pipe formed by lofting a front circular cross-section and a rear circular cross-section, where centers of circles of the front and rear cross-sections are at a same horizontal line and the circles are tangent to each other, an inner diameter of the front cross-section is d1=10-12 mm, and an inner diameter of the rear cross-section is d2=28-30 mm;
- the dust settlement channel is formed by lofting a front circular cross-section and a rear semi-circular cross-section, centers of circles of the front and rear cross-sections are concentric, and inner diameters of the front and rear cross-sections are d2=28-30 mm;
- the sensing channel is a circular cross-section bend pipe with an inner diameter d4=10-12 mm and an outer diameter d5=12-14 mm;
- distances between centers of circles of the jack I, jack II, jack III and jack IV are L1=15-18 mm, inner diameters of the jacks are d3=8-9 mm, and heights of all jacks in relative to height of center of cross-section of the air inlet channel are L2=60-62 mm;
- the dust collection channel is formed by lofting an upper elliptical cross-section and a lower circular cross-section, and circles of the upper and lower cross-sections are tangent to each other in their rear directions;
- the single-chip microcomputer controller comprises a control unit, a signal acquisition unit, a touch display screen, and a power supply, where the control unit comprises the solenoid valve I and the solenoid valve II;
- the signal acquisition unit comprises the gas-sensitive sensor array and an analog-to-digital acquisition module;
- the control unit, the signal acquisition unit, and the touch display screen are connected to the power supply through wires;
- the dust collection box comprises a dust passage pipe, a dust collection chamber, and a filter screen, where the dust passage pipe is fixedly connected to and communicated with a center of an upper end of the dust collection chamber, and the filter screen is fixedly connected to a lower end of the dust collection chamber;
- an upper end of the dust passage pipe is threaded to a lower end of the dust collection channel, an outer diameter of the dust collection chamber, being a cylinder, is d6=40-45 mm, and a diameter of mesh of the filter screen is d7=0.3-0.5 mm;
- the solenoid valve I is communicated with the air inlet channel of the dustproof chamber;
- the gas-sensitive sensor array is fixedly connected to the jack I, jack II, jack III and jack IV respectively of the sensing channel of the dustproof chamber;
- the air pump is communicated with a rear part of the sensing channel of the dustproof chamber;
- the dust collection box is communicated with a lower part of the dust collection channel in the dustproof chamber through the solenoid valve II;
- the single-chip microcomputer controller is connected with the solenoid valve I and the solenoid valve II through wires, the single-chip microcomputer controller is connected with the gas-sensitive sensor array and powered through the power supply, and a voltage signal transformation generated by the gas-sensitive sensor array is collected, recorded and stored through the analog-to-digital acquisition module;
- wherein the filter membrane is located at an entrance of the sensing channel and is used to intercept particles in the dust settlement channel from entering the sensing channel, thereby ensuring that the gas-sensitive sensor array is not affected by fine particles and achieving dust-proof sampling.