Foam producing method, fire extinguishing method, and appliance for foam extinguishing
US11559711B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Feb 26, 2018 |
| Grant date | Jan 24, 2023 |
| Priority date | — |
| Expiry date | Jan 30, 2040 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01F2215/0472
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A foam production method includes mixing liquid nitrogen with a foaming material to produce foam. A gas is produced in situ from liquid nitrogen. As the ratio of the volume of the gas produced by gasification of liquid nitrogen to the volume of the liquid nitrogen is relatively high, when a large gas supply flow is needed to generate a large foam flow, a liquid nitrogen storage device of a small volume can be used instead of bulky air supply devices such as high-pressure gas cylinders, air compressors, air compressor sets and the like, reducing the volume of the air supply device. In addition, the liquid nitrogen used in foaming will release nitrogen gas after the foam blast, such that the nitrogen is also able to inhibit combustion on the surface of burning materials, accelerating the extinguishing of the fire.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.