SU1255725A1 - Device for supercharging diesel locomotive i.c.engine - Google Patents

Description

The invention relates to mechanical engineering, namely engine building, and can be applied in devices for preventing surge in diesel engines of internal combustion with supercharging.

The purpose of the invention is to increase the reliability of preventable surging on the diesel modes of the engine in the power range of 85-100% of total power.

FIG. 1 shows a device for pressurizing a diesel internal combustion engine; in fig. 2 - electropneumatic relay, cross section.

The device contains at least one turbocharger 1, a drive blower 2, a safety valve 3, an electromagnetic valve 4 and an electropneumatic relay 5. The gas inlet 6 of the turbocharger 1 is connected to the exhaust manifold 7 of the engine 8, the air inlet 9 to the drive supercharger 2, and air inlet pipe 10 is in communication with the atmosphere. The safety valve 3 is provided with an inlet 11, an exhaust 12 and a control 13 cavities, of which the inlet cavity 11 is connected to the air inlet 9 of the turbocharger 1, and the control cavity 13 is in communication with the atmosphere through the drainage channel 14. The solenoid valve 4 is connected to the power supply circuit 15 and is installed in the drainage channel 14. The electropneumatic relay 5 is equipped with high and low pressure strips 16 and 17 and a control cavity 18 separated from them by a valve 19 equipped with contacts 15 for supplying the solenoid valve 4. The control cavity 18 of the electropneumatic relay 5 is connected to the outlet cavity 12 of the valve 3, the pressure cavity 16 is connected to the inlet cavity 11 of the valve 3, and the low pressure cavity 17 is connected to the air inlet I th pipe 10 turbocharger 1.

The device works as follows.

When the engine 8 is operating, the exhaust gases from the manifold 7 through the gas inlet manifold 6 enter the turbocharger i and drive it into rotation. The turbocharger 1 feeds compressed vdushduh into the drive supercharger 2, where it is still compressed and fed into the engine 8. Part of the compressed air enters the inlet cavity 11 of valve 3, and from it through the outlet cavity 12 into the control cavity 18 of the relay. 5. From the cavity 17 of the relay 5, air is sucked into the air inlet 10 of the turbocharger 1.

In the normal position in the cavity 16 of the relay 5, the pressure is equal to the air pressure in the air-pressure pipe 9, and in the cavity 17 - the vacuum is equal to the vacuum in front of the turbo compressor 1 in the pipe 10. Since the valve area 19 facing the cavity 17 is greater than the area facing cavity 16, the valve 19 is pressed against the body of the relay 5, the contacts 20 are open. When the turbocharger hits the surge, the ratio between the pressure in the pipe 9 and the vacuum in the air inlet pipe 10 changes (the pressure decreases or the pressure increases), valve 19 rises and closes normally open contacts 20 in power supply circuit 15

5 of the electromagnetic valve 4. The latter opens and communicates through the drainage channel 14 a control cavity 13 of the valve 3 with the atmosphere. Valve 3 is activated, communicates cavities 11 and 12, and bypasses a portion of compressed air from nozzle 9 to the atmosphere or into the air inlet 10 of the turbocharger 1. The surge stops. At the moment the valve 3 is turned on, a portion of the compressed air from the exhaust cavity 12 enters the control cavity 18 of relay 5 and lowers clap5 pan 19, bringing relay 3 to its original position. At the same time, the valve 3 remains on until the operating mode of the engine 8 is changed to a lower load and the locking relay is turned off (not shown). Relay Relay 5

0 to the initial position can compressed air from the cavity 13 of the valve 3 when the solenoid valve 4 is turned on. Relay 5 is set up by means of a spring and pressing nut. The safety valve 3 can be shut off automatically or manually by opening the contact of the blocking relay in the circuit 15 of the power supply to valve 4 while reducing the load or stopping the engine.

It is known that the surge in the device - for supercharging a diesel engine (in particular, a two-stroke engine) takes place only when it is working on high-power modes in the range of 85-100% of the total power. Therefore, the setting of the proposed device is carried out only on

5 this range.

Thus, the proposed implementation of the device makes it possible to increase the reliability of preventing the turbo compressor from surging in the turbocharging system of an internal combustion engine (without using electronic blocks and pressure sensors) in the specified engine power ranges.

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Claims (1)

DEVICE FOR SUPPLYING A DIESEL DIESEL INTERNAL COMBUSTION ENGINE, containing at least one turbocharger, a gas inlet of which is connected to an exhaust manifold of an engine, an air inlet - to a drive supercharger, and an air inlet which is connected to the atmosphere, a safety valve provided with an inlet the cavity is connected to the air pressure pipe of the turbocompressor, and the control is communicated through the drainage channel with the atmosphere, and an electromagnetic valve, connected to the power circuit and installed in the drainage channel, characterized in that, in order to increase the reliability of preventing surging in the diesel engine characteristics and in the power range 85-100% of the total engine power, it is equipped with an electro-pneumatic relay with cavities of high and low pressure and a control cavity separated from them by means of a valve provided with contacts connected to the power supply circuit of the electromagnetic valve, the control cavity of the electro-pneumatic relay being connected it is single to the outlet cavity of the safety valve, the cavity of the increased pressure to the inlet cavity of the safety valve, and the cavity of the reduced pressure to the air inlet of the turbocharger. fi g!