RU2824243C1 - Internal combustion engine preservation method - Google Patents

Abstract

FIELD: engine building.

SUBSTANCE: invention can be used for protection of metal from corrosion during preservation of engines. During the internal combustion engine conservation, an inert gas with density higher than that of air, for example, argon, is fed into the inlet path, and pressure in the inlet path is not less than 0.05 kgf/cm². Fuel supply to cylinders is cut off and engine crankshaft is cranked by starter for 7 s, thus providing filling of cylinders, inlet and outlet paths with inert gas. Starter is disconnected and the engine is stopped, the outlet path is sealed, supply of inert gas to the inlet path is stopped and it is sealed. Then the oil filler plug is unscrewed, the dipstick is removed to check the oil level, inert gas is supplied to the lower part of the engine crankcase through the formed hole for the dipstick with nominal supply of not more than 2 l/s for 70 s. After that, supply of inert gas is stopped, the dipstick is installed, the oil filler neck is screwed up and the ventilation system of crankcase gases is sealed.

EFFECT: proposed method allows to reduce labour intensity, increase efficiency of works performance and reduce oxidative reactions in engine during its conservation.

1 cl

Description

The invention relates to the field of technical maintenance of machines, in particular to a method for preserving an internal combustion engine.

Existing methods of preserving internal combustion engines, based on sealing the cylinders by forcibly closing the valves of all cylinders, the intake and exhaust tracts, treating the surfaces of the above-piston space with special preservative lubricants or inhibitors, are highly labor-intensive, do not provide for the removal of air from the internal cavities of the engine and require cleaning the cylinder surfaces before starting the engine during subsequent removal from preservation.

A method for preserving a piston internal combustion engine is known [1], in which the engine's intake and exhaust tracts are sealed, the crankshaft is rotated from an external energy source, and simultaneously with the crankshaft rotation, a preservative lubricant is introduced into the cylinders using a special device. The introduction of the preservative lubricant is carried out without fuel supply.

The specified method of preserving a piston internal combustion engine does not provide for the removal of air from the intake and exhaust tracts, as well as from the engine cylinders, which reduces the effectiveness of preservation, since the remaining air will contribute to the development of oxidation reactions and the formation of condensate on the surfaces of engine parts.

A method is known for preserving a piston internal combustion engine and its fuel system apparatus [2], in which the exhaust tract is sealed, the engine crankshaft is rotated from an external energy source, and at the same time, a volatile corrosion inhibitor VNH-L-49 (C13) is introduced into the engine cylinders through the fuel system, which is mixed with fuel before being fed into the fuel system in a proportion of 5% of the volatile corrosion inhibitor from the volume of fuel.

The technology for implementing this method also does not provide for the removal of air from the engine cavities; moreover, the supply of fuel to the engine cylinders will lead to the forced removal of the oil film on the cylinder walls, which will cause increased wear during subsequent engine start-up.

The closest technical solution selected as a prototype is a method for preserving an internal combustion engine and an anti-corrosion device, in which the air cleaner inlet and the muffler outlet pipe are sealed, a portion of oil is poured into each cylinder through the spark plug hole, the crankshaft is rotated immediately after pouring, followed by periodic crankshaft rotation during storage, the channels of the anti-corrosion device are connected to the cylinder cavities and to the engine crankcase, and when the crankshaft is rotated, air is bypassed from the compression cavities to the expansion cavities using the anti-corrosion device, drying it. In the anti-corrosion device of an internal combustion engine, including channels with connecting units at the ends, hermetically connected to the cylinder cavities and to the engine crankcase, the channels are designed with the possibility of placing a moisture absorber in them in such a way as to prevent oil from getting on it.

The presented method is difficult to implement, since it is necessary to pre-fabricate an anti-corrosion device, in addition, when preserving diesel internal combustion engines, supplying a portion of oil to each cylinder and connecting the anti-corrosion device requires dismantling either glow plugs or fuel injectors, which will additionally increase the labor intensity of the work performed.

The above-mentioned disadvantages of the methods of preserving internal combustion engines can be eliminated by replacing air in the intake and exhaust tracts, in the cylinders and crankcase of the engine with inert gas. Inert gas acts as a preservative.

The technical task is to improve the method of preserving an internal combustion engine by reducing labor intensity, increasing the efficiency of work and reducing oxidation reactions in the cylinders and crankcase of the engine.

The essence of the invention is as follows. When preserving an internal combustion engine, an inert gas with a density greater than that of air is supplied to the intake tract, and a pressure of at least 0.05 kgf/ ^cm2 is created in the intake tract. The fuel supply to the cylinders is disconnected and the engine crankshaft is cranked by the starter for 7 s, thereby filling the cylinders, intake and exhaust tracts with inert gas. The starter is disconnected and the engine is stopped, the exhaust tract is sealed, the supply of inert gas to the intake tract is stopped and sealed. Then the oil filler cap is unscrewed, the dipstick is removed to check the oil level, and through the resulting hole for the dipstick with a nominal supply of no more than 2 l/s, inert gas is supplied to the lower part of the engine crankcase for 70 s. After which, the supply of inert gas is stopped, the dipstick is installed, the oil filler cap is tightened and the crankcase ventilation system is sealed.

Thus, a fairly simple method of preserving internal combustion engines is created, applicable to both gasoline and diesel engines.

In practice, the proposed method can be implemented as follows.

When preserving an internal combustion engine under operating conditions, an inert gas with a density greater than that of air is fed into the intake tract, and a pressure of at least 0.05 kgf/ ^cm2 is created in the intake tract. The fuel supply to the cylinders is turned off by moving the engine stop bracket on the fuel pump to the "off supply" position. In the case of an electronic engine control system, the fuel supply is turned off programmatically through external diagnostic tools (e.g., diagnostic scanners). The engine crankshaft is cranked by the starter for a time calculated using the formula:

Where - volume of the intake tract, l;

- total cylinder volume, l;

- volume of the exhaust tract, l;

- current crankshaft speed, s ^-1 ,

thus filling the cylinders, intake and exhaust tracts with inert gas. Disconnect the starter and stop the engine, move the engine stop bracket to the "running" position, or disconnect the external diagnostic tool. Seal the exhaust tract, stop the supply of inert gas to the intake tract and seal it. Then unscrew the oil filler cap, remove the dipstick to check the oil level, and feed inert gas into the lower part of the engine crankcase through the resulting hole for the dipstick with a nominal flow rate of no more than 2 l/s for a time calculated using the formula:

- engine crankcase volume, l;

- inert gas supply, l/s.

Then stop the supply of inert gas, install the dipstick, tighten the oil filler cap and seal the crankcase ventilation system.

A non-flammable gas that is harmless to human health, such as argon, which does not enter into chemical reactions with engine part materials within a given storage temperature range, can be used as an inert gas. The density of the inert gas must be greater than the density of air to ensure gradual filling of the engine crankcase by displacing air.

The calculations performed using formulas (1) and (2) showed that for modern engines with a starting crankshaft speed of at least 2.5 s ^-1 (150 min ^-1 ) to fill the cylinders, intake and exhaust tracts with inert gas, it is sufficient to rotate the crankshaft with a starter for 7 s; to fill the crankcase of modern engines with a nominal gas supply of no more than 2 l/s, a sufficient supply duration of no more than 70 s.

The gas supply limitation of 2 l/s is caused by the need to create a laminar gas flow. A larger supply will lead to intensive mixing of gas with air, which will reduce the conservation efficiency.

As a result, it is possible to preserve an internal combustion engine using generally available and simple maintenance tools.

List of sources

1. A.s. No. 971917, M Cl. C23F 11/04. Method of preserving a piston internal combustion engine / A.Kh. Kagan, V.L. Kupershmidt, A.E. Severny et al. - No. 2935115/25-06; declared 04.06.1980, published 07.11.1982. Bulletin No. 41.

2. Patent No. 2062306 RF, IPC C23F 11/04, F02M 25/00. Method for preserving a piston internal combustion engine and its fuel system apparatus / V.V. Kolesov, V.M. Podchinok, V.V. Vinogradov. - No. 94000491/06; declared 05.01.1994, published 20.06.1996.

3. Patent No. 2330974 RF, IPC F02B 77/04. Method for preserving a piston internal combustion engine and an anti-corrosion device / V.Ya. Kostylev. - No. 2006109960/06; declared 28.03.2006, published 10.10.2007 No. 22.

Claims (1)

A method for preserving an internal combustion engine, which consists in preparing the engine, cranking the engine crankshaft with an external energy source, introducing a preservative into the engine cylinders, characterized in that under operating conditions, an inert gas with a density greater than the density of air is fed into the engine intake tract and creating a pressure in the intake tract of at least 0.05 kgf/ ^cm2 , turning off the fuel supply to the cylinders, cranking the engine crankshaft with a starter for 7 s, turning off the starter and stopping the engine, sealing the exhaust tract, stopping the supply of inert gas to the intake tract and sealing it, then unscrewing the oil filler cap, removing the dipstick to check the oil level, feeding inert gas into the lower part of the engine crankcase through the resulting hole for the dipstick with a nominal supply of no more than 2 l/s for 70 s, after which the supply of inert gas is stopped, the dipstick is installed, and the plug is screwed on oil filler neck and seal the crankcase ventilation system.