Compositions – Electrolytes for electrical devices
Patent
1990-03-19
1990-12-18
Howard, Jacqueline V.
Compositions
Electrolytes for electrical devices
252 495, 252 515A, 252 515R, 252 75, C10M17302, C10M14906
Patent
active
049784668
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to lubricating materials and, more particularly to a non-combustible lubricating fluid.
STATE OF THE ART
Lubrication of bearings in turbine and hydraulic turbo-machine control systems require the use of a lubricating fluid which ensures fluid friction with a preset thickness of the bearing fluid film between the rotary and stationary parts of the bearing, reduces the friction, and provides transmission of hydraulic pulses in devices of hydraulic turbo-machine control systems.
As said lubricating fluids mineral turbine oils are used in the world practice of operating turbo-machines (V. N. Kazansky, "Sistemy Smazki Parovykh Turbin", 1974, Energiya Publishers, Moscow, pp. 9, 208-211).
Mineral turbine oils, however, suffer from a serious disadvantage: they are fire-hazardous and cause fire accidents at electric power plants.
Also widely known in the art are non-combustible lubricating fluids based on water, including water itself. Water, however, has a low viscosity (1 cSt) and, as a result, the thickness of the bearing lubricating film in the hydrodynamic sliding-contact bearing proves to be insufficient for a reliable separation of the friction surfaces, which causes their increased wear and destruction.
Non-combustible lubricating fluids are known in the art, comprising water and polyglycols (K. I. Ivanov (ed.), "Ognestoikie Turbinnye Masla", 1974, Khimiya Publishers, Moscow, pp. 20-22). These fluids, however, are disadvantageous in that their viscosity at a preset temperature is not sufficiently stable in the course of time, so that they fail to provide stable operation of the turbo-machines. Polyglycols used in said lubricating fluids are very short-supply additives.
Also known in the art is a non-combustible lubricating fluid, comprising water and polyacrylamide (SU, A, 168826). However, the viscosity of this composition is also unstable in the course of time at a preset temperature. Furthermore, this fluid is very aggressive with respect to carbon steels which are the main structural materials in the manufacture of bearings for turbines, of hydraulic systems of turbo-machine control, and the like.
DISCLOSURE OF THE INVENTION
The invention is based on the problem of improving the stability in time of the temperature-viscosity characteristics of a non-combustible lubricating fluid, while reducing the aggressiveness thereof, by introducing novel components into the composition of said fluid and by changing the quantitative ratio of the components thereof.
This problem is solved by that a non-combustible lubricating fluid proposed herein, comprising polyacrylamide and water, according to the invention, also comprises triethanolamine and sodium nitrite, the ratio of the components being as follows (in % by mass):
______________________________________ polyacrylamide 0.3-0.6
triethanolamine
0.8-1.5
sodium nitrite 0.1-0.3
water the balance.
______________________________________
The rate of corrosion of carbon steel under the effect of the prior art non-combustible lubricating fluid (SU, A, 168826) and under the effect of the herein-proposed non-combustible lubricating fluid, measured under similar conditions and with similar concentrations of polyacrylamide (0.4% by mass is 0.34 mm/year and 0.0021 mm/year, respectively. Thus, the non-combustible lubricating fluid proposed herein is appreciably less aggressive than said prior art non-combustible lubricating fluid.
The non-combustible lubricating fluid proposed herein has a viscosity whose time stability at a preset temperature is higher than that of the prior art lubricating fluid (SU, A, 168826).
The herein-proposed non-combustible lubricating fluid provides reliable operation of turbo-machines, it is explosion- and fire-safe, and no special measures of human protection are required when handling it.
BEST WAY OF CARRYING OUT THE INVENTION
If the ratio of the components of the herein-proposed lubricating fluid is changed, the reliability of the turbo-machine operation will be lowered.
The con
REFERENCES:
patent: 3833502 (1974-09-01), Leary
patent: 4487658 (1984-12-01), Ciuti
patent: 4522733 (1985-06-01), Jonnes
patent: 4563294 (1986-01-01), Geymayer et al.
patent: 4728452 (1988-03-01), Hansen
patent: 4781847 (1988-11-01), Weitz
V. N. Kazansky, "Systemy Smazki Parovykh Turbin", 1974, Energiya Publishers, Moscow, pp. 9, 208-211.
K. I. Ivanov (Ed.), "Ognestoikie Turbinnye Masla", 1974, Khimiya Publishers, Moscow, pp. 20-22.
Degtyareva Eleonora V.
Gnilitskaya Alla I.
Grinberg Yakov M.
Kantemir Anatoly D.
Khanin Andrei M.
Howard Jacqueline V.
Proizvodstvennoe Obiedinenie Atomnogo Turbostroenia "Kharkov Sky
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