SU56005A1 - Device for igniting the working mixture in carburetor engines for internal combustion - Google Patents

Description

Devices for igniting the working mixture in carburetor internal combustion engines are known, in which the walls of the ignition chamber heated by the heat of the exhaust gases are used, periodically and automatically communicated and released from the working cylinder by means of a plunger valve.

In the proposed device of this kind on the cylinder cover is reinforced with an external ribs primal cap protruding into the exhaust channel and partially protected from external heat losses with an additional exhaust valve or screen.

In FIG. 1 shows a longitudinal section of the device; FIG. 2 is a longitudinal section of another form of the device; FIG. 3 shows a section along the line AB in FIG. 2

On the lid / working cylinder 2, a steel ignition cap 3 fitted with external ribs is screwed with its lower end into a nut 4, which is clamped between cylinder 2 and lid /, with a lining of two washers 5 and from mica or other non-conductor heat. The firing chamber 7 of the cap 3, which projects its ribbed part into the exhaust channel 8, through the washer 6 and the channel 9 in the cylinder head communicates with the recess 10. To close the channel 9, a plunger valve 11 serves to cool the head of which through the air slots 12 and channels / 5 and 14.

The plunger valve And, resting against the spring 16, which presses it with a force of 1-2 atm., Can move inside the adjustment cylinder 17. This latter rests against the spring 5, the degree of pressing of which is adjusted through the piston 19 by the eccentric 20 sitting on adjustment roller 15. In the described construction, applied to series-connected exhaust valves 21 and 22. The use of two valves is desirable (but not necessary) in order to minimize the cooling of the pilot cap 5 during suction and compression.

A detachable exhaust valve 24 is positioned in the removable tide 23 in order to protect the ignition cap from heat losses and is controlled from the same distribution roller as the main exhaust valves, and for it there is an independent cam on the distribution roller controlling this valve 24 that it opens and closes slightly before the main exhaust valve.

At the beginning of the compression of the mixture, the cylinder 17 and the plunger valve 11 are in their normal position (Fig. 1). When the degree of compression of the gasoline-air mixture in the working cylinder reaches a predetermined limit, the pressure of the mixture on the annular base of the cylinder 17 moves this cylinder and valve 11 back and the mixture bursts into the chamber 7 of the cap 3, where the pressure is much lower. There is an ignition of the mixture from the walls of the cap. During combustion of the mixture, both cylinder 17 and plunger valve YJ are pressed down.

At the moment of exhaust channel 9 remains open due to the fact that the pressure of the spring 16 is designed for 1-2 atm. Thus the gas from the cap comes out, which contributes to the cooling of the recess 10.

After sufficient vacuum has been obtained in the cavity of the cap 3, the head of the plunger valve 11 is closed again and can again be opened only by displacing the cylinder 17. As the cap 5 begins to cool after exhausting, it is not necessary that the expansion of the gas in the cap opens due to heating. valve 11.

Channel 9 has a channel hole 25 leading to a thermal electric plug (not visible in this section), which is designed to ignite the mixture when the engine is started until the ignition cap is heated enough to cause ignition. The candle is energized from the battery until the dynamo provides current, and then from the dynamo. After warming up the cap 3, the power supply to the candle is switched off and the candle stops working.

The described device with an additional exhaust valve is a reliable system for machines with

2 -

Immediate and average number of boring, in which the cooling time of the cap is long enough and the use of additional valve 2, apparently, is necessary.

For high-speed engines (aviation type), where offgas occurs very often, it is proposed to use a slightly different form of the device (Fig. 2).

A cylinder cover 26 (the form was developed for the four-valve engine AM-34) has a channel 26, tightly closed by the head of a hollow plunger valve //, on the head of which the spring 27 presses with such force that the valve opens only at the end of the compression. I The moment otKpbtTHH of valve 11 is controlled by varying the voltage of the spring 27 by means of a piston 19, an eccentric 20 and a roller.

After the valve 11 is opened, the mixture penetrates into the chamber 28, and the surface of the valve, on which the mixture is pressed, increases. Therefore, the valve

The cell moves to its original position and is pressed tightly against the body 29 with a special shoulder, thus eliminating the possibility of leakage of gas into the atmosphere during the explosion of the mixture.

After the valve / mixture is depressed, through the grill 30 from chamber 28 enters chamber 7 of the ignition cap 3. The mixture ignites from contact with grille 30 and the corrugated wall of chamber 7.

During the period of exhaust gases, the pressure in the cylinder drops, but the valve 11 does not immediately close due to the fact that the surface on which the gases are pressed is much larger than the surface on which the mixture presses at the moment of compression (Fig. 2); the ratio of the surfaces is such that if the valve 11 opens at a cylinder pressure of 7 kg / cm, it closes at a cylinder pressure of 1 kg / cm. .

Thus, in chambers 7 and 28, the pressure when the valve 11 is closed will always be significantly less than the pressure in the cylinder, which is necessary to ignite the mixture.

The grill 30, mounted on mica insulation, is designed to accumulate heat at the time of the explosion and to protect the chamber 7 from being cooled by a cooler chamber 28.

At the time of the start-up, the ignition comes from an electric plug 31 fed from a battery and a dynamo, as described above. After start-up, the power to the plug is turned off.

To reduce heat dissipation, the ignition cap 3 during suction and compression uses a heat insulating screen 32 (Fig. 2 and 3) made from a special chamotte or other sufficiently resistant heat insulator. The screen is fixed to the removable part of the exhaust pipe with three screws 33 screwed into the refractory steel, embedded in the material of the screen 32. For less radiation, the cap 3 is black and the outer part of the screen 32 is glazed for better reflection.

The subject matter of the invention.

Claims (3)

1. Device for igniting the working mixture in carburetor engines internal combustion using the heat of the exhaust gases of the walls of the ignition chamber, periodically and automatically communicated and disconnected from the working cylinder by means of a plunger valve, characterized by the use of a finned outside on the outside of the ignition chamber 3 (FIG. 1-3) that acts as its own finned part in the exhaust channel and partially protected from external heat losses by an additional exhaust valve 24 (Fig. 1) or screen 32 (Fig. 2 and 3). 2. In the device according to claim. 1, use of a starting electric glow plug placed in the ignition chamber. 3. In the device according to claim 1, use of an adjusting eccentric 20, which serves to change the tension of the spring, loading the automatic plunger valve // (Figs. 1 and 2), which communicates and separates the ignition chamber with the working cylinder. A. F. Osadchenko and A. YA2 56005 2 Ed. Editor L. V. Nikitin - .Techred A.I. Khrosh ilType “Printing Yard, Zack. No. 66 / 4-500 by A. Mirushchenko. E to the author's testimony A. F. FIG. Osadchenko and A. State Planning Board Y Lenoblgorlit Na 15