Test on air supply function of escape immersion suit′s inflation system
10.3760/cma.j.cn311847-20190621-00156
- VernacularTitle:脱险潜水服充气系统供气性能试验研究
- Author:
Chumeng LIU
1
;
Jinghua GU
1
;
Pingxiao LIU
1
Author Information
1. 200433 上海，海军军医大学海军特色医学中心
- Publication Type:Journal Article
- Keywords:
Fast buoyancy escape;
Fast compressing;
Air supply peculiarity;
Air supply flow
- From:
Chinese journal of nautical medicine and hyperbaric medicine
2020;27(4):423-426
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To study the dynamic air supply peculiarity of the inflation system, by observing the pressure changes of the inflation system, the airbag, and the hood in working mode.Methods:The pressurized chamber for simulation was pressurized to the setting pressure P1 at an exponential rate of . When setting the P1 as 0.2 MPa, 0.7 MPa, 1.1 MPa, 1.6 MPa, and 2.1 MPa, the pressurization time constant b was taken as 30 s, 20 s, 10 s, 7 s, and 4 s respectively. The air supply flow of the inflation system ( Q), the relative pressure in the airbag (Δ P) of the escape immersion suit, and the relative liquid level in the hood (Δ Z) were recorded during the pressurization process, for describing and analyzing the dynamic air supply peculiarity. Results:When the pressure of the simulated pressurized chamber increased to 0.2 MPa, Q increased rapidly and linearly. The functional relation between the linear slope k and b was K=747.81 b-0.26; then a short plateau period of Q appeared with the fluctuation range of 0.9-3.1 kg/h and the pressure range of 0.2-0.4 MPa; after that, Q gradually increased as the environmental pressure increased. The change of the relative pressure in the airbag (Δ P) reflected the regulation process of Q. When pressurized at 0.15 MPa, Δ P increased sharply to the highest value, then it tended to be stable with the increase of the pressure in the simulated pressurized chamber; the higher the P1 was set, the higher Δ P became, but it always remained between 11 kPa and 14 kPa. The functional relation between Δ P and P1 was Δ P= P10.088 4. The relative liquid level in the hood (Δ Z) was the ultimate goal of the air supply of the inflation system. Δ Z was always lower than the liquid level in the simulated pressurized chamber during the pressurization process, and decreased when the pressure of the chamber increased; Δ Z was related to Δ P, and the higher Δ P was, the higher Δ Z was, at the same depth. Conclusion:The airflow of escape immersion suit′s inflation system can match the compress rate of simulated pressurized chamber, and the air supply can be adjusted automatically without manual operation, which can improve the safety of escape.
