SU1671943A1 - Starting and reverse device for internal combustion engines - Google Patents

Abstract

The invention makes it possible to simplify the design of the device and reduce the consumption of compressed air to reverse the engine. The device contains at least one starting valve 1 installed in the engine cylinder. The working cavity of the valve is connected via a main starting valve 3 to a compressed air source through a starting line 2, and the control cavity through a pulse channel to an air distributor 6. The central channel of the air distributor 6 is connected to the starting line 2 through a normal valve and the normally closed servo valve 9 - with a source of compressed air. The device also contains a check valve 11, the inlet of which is connected to the start-up line 2, and the outlet to a source of compressed air. 1 il.

Description

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The invention relates to mechanical engineering, in particular to engine-building, namely to devices for starting and reversing an internal combustion engine, preferably a shipboard engine.

The purpose of the invention is to simplify the design of the device and reduce the consumption of compressed air to reverse the engine.

The drawing shows a diagram of the device.

The device contains at least one starting valve 1 installed in the engine cylinder, the working cavity of which is connected via a main starting valve 3 via a main start valve 3 to a source of compressed air, and the control cavity is connected to the air distributor 6 via a pulse channel 5 the channel of which is connected via a reversing valve 7 to the starting line 2 on the one hand, and on the other via pipeline 8 via a normally closed servo valve 9 to the source 4 of compressed air, the main start-up The first valve is equipped with a bypass line 10c with a non-return valve 11 placed in it, the inlet of which is connected to the start-up line 2 between the main start-up and change-over valve, and the outlet is connected to the source 4 of compressed air.

The device works as follows.

When the engine starts, the start signal from the remote automated control system (DAU) is supplied to the control cavity of the main start valve 3. The latter opens and air from the source 4 of compressed air comes from the starting line 2 to the working cavity.

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the starting valve 1 and simultaneously through the changeover valve 7 to the central channel of the air distributor 6. From the air distributor 6, according to the order of operation of the cylinders, the air through the pulse channel 5 is fed into the control cavity of the starting valve 1, which opens and provides compressed air from the starting line 2 into the engine cylinder, the cranking of the engine crankshaft begins with compressed air.

When the crankshaft is rotated at a certain angle from the air distributor 6, a signal is received to close the starting valve 1. At the same time, the air from the control cavity of the starting valve 1 through the pulse channel 5 and the discharge window of the air distributor 6 is released into the atmosphere, the starting valve 1 closes and stops the supply of compressed air into the engine cylinder.

Similar cycles are repeated until the engine develops the crankshaft starting frequency.

When reversing the engine while the ship is running, the gas distribution has already been set to reverse, and the engine crankshaft, under the action of the propeller operating in the turbine mode, continues to rotate in the same direction, a pneumatic braking signal is generated in the DAU system. This signal is fed into the control cavity of the normally closed servo valve 9, which then opens and provides air from source 4 through conduit 8 through the change-over valve 7 to the central channel of the air distributor 6. The latter begins to control the opening and closing of the starting valve 1 taking into account the back valve distribution i.e. The starting valve 1 opens (the engine cylinder communicates with the starting line 2) at the beginning of the compression stroke as the piston moves up and closes after the piston passes the top dead center, i.e. at the beginning of the expansion stroke.

When the piston moves upward in the engine cylinder, the air coming from the atmosphere through the exhaust valve is compressed. After opening the start valve 1, the air from the cylinder begins to flow into the start line 2, where pressure also builds up. After the piston passes the upper dead center at the beginning of the expansion stroke, the air distributor 6 delivers

a command to close the starting valve 1, as a result of which the latter closes and prevents the backward flow of air from the starting line 2 back into the cylinder

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Due to the back gas distribution, the air is forced into the starting line 2, i.e. engine braking is transferred to compressor mode. After each compression stroke, the air pressure in the start-up line 2 increases, and the braking torque on the engine crankshaft increases. When the air pressure in the starting line 2

exceeds the pressure at the source 4, opens the check valve 11 and provides air flow from the start-up line 2 to the source 4, thereby replenishing the compressed air supply.

After the engine has stopped, the engine brake signal in the DAU system disappears and a start signal is generated. As a result, the servo valve 9 is closed, and the main starting valve 3 is opened and provides compressed air to the starting line 2. The engine is started in the opposite direction in the usual order.

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Claims (1)

Invention Formula A device for starting and reversing a predominantly marine engine for internal combustion, comprising at least at least one starting valve installed in the engine cylinder, the working cavity of which is connected with a source of compressed air through the main starting valve by means of a starting line, and an air distributor with at least one pulse channel and a central channel that is connected through a check valve on one side starting line, and on the other with the help of the pipeline through normally closed servo valve - with a source of compressed air, characterized in that, in order to simplify the design and reduce the consumption of compressed air to reverse the engine, the main starting valve it is equipped with a by-pass pipeline with a check valve placed in it, the inlet of which is connected to the starting line between the main starting and reversing valves, and the outlet to a source of compressed air, and the control cavity of the starting valve communicates through a pulse channel with the air distributor. Turn signal Trigger signal WITH -