Patent ID: 11961378
Assignee: nan
Field: Chemical engineering (Chemistry)
Classification: CPC B  G | IPC B  G

Claim 13:
14. The aspirating smoke sensing apparatus according to claim 12, wherein the aspirating smoke sensing device for fire detection further comprises a first filter and a second filter, an input port of the first filter being communicated with the air intake structure, an output port of the first filter being communicated with an input port of the second filter and the input port of the coagulator respectively, and an output port of the second filter being communicated with another input port of the coagulator;
a filtering material of the first filter has a larger gap than a filtering material of the second filter;
the first filter is configured to filter the air sample, so as to obtain a first filtered air sample;
the second filter is configured to filter the first filtered air sample, so as to obtain a second filtered air sample that is a clean air; correspondingly, when performing the collisional coagulation on the air sample to increase the particle-sizes of the particles in the air sample, the coagulator is specifically configured to:
mix the first filtered air sample and the second filtered air sample, so as to obtain a mixed gas sample with a preset particle concentration;
the second filtered air sample is the clean air, and serves to purge and protect bipolar charging needles in the coagulator while blowing out positive and negative ion flows between the bipolar charging needles to be mixed with the first filtered air sample, and the collisional coagulation is performed on the mixed gas sample, so as to increase the particle-sizes of the particles in the air sample.