SU724790A1 - Exhaust-gas temperature limiting device - Google Patents

Description

I

This invention relates to mechanical engineering, in particular engine-building.

According to the main author. St. No. 578484 are known exhaust gas temperature limiters for an internal combustion engine, comprising a gas temperature sensor connected via a hydraulic system to a fuel metering unit, the hydraulic system is provided with a bypass line with a control valve communicating with the sensor. The device makes it possible to limit the temperature of the exhaust gases, thereby adapting the engine conditions to operating conditions (type of fuel, fairway, etc.).

However, the known limiter does not allow for taking into account the time during which the engine is working with overload, i.e. in a certain sense is not perfect enough.

The purpose of the invention is to eliminate this drawback.

To achieve this goal, the bypass line is equipped with a hydraulic clock.

The drawing schematically shows the temperature limiter of the exhaust gases.

The diesel temperature limiter consists of a gas temperature sensor 1 connected to an actuator 2 and a spool switch-relay 3 with a hydraulic clock 4 included in

bypass line. Sensor 1 contains a thermometric part 5 installed in the exhaust gas line, made of tubes with different linear expansion coefficients, screen 6, housing 7, inside of which are located control

valve 8 and valve 9 forming cavities A, B, and B. An adjustment device 10 is provided for adjusting sensor 1 to a desired temperature. Sensor 1 cavity B is connected by means of a hydraulic system — pipe 11 is connected to cavity G of an actuator 2 formed by a bellows installed in its housing 12 and a cover 13. Inside the bellows 12 is mounted an adjusting device 14 with a spring 15.

Claims (2)

The cavity A of sensor 1 by tube 16 is connected to a spool switch-relay 3, in the case of which there is a two-stage spool 17 forming the annular cavities D, E and W, springs 18 and 19 and the pusher 20. The spool switch 3 is connected to a bypass line 21 and tube 22 With a hydraulic clock 4. The hydraulic clock contains a cylinder 23, a valve 24, a float 25 and throttles 26 and 27, through which the cylinder 23 communicates with the bypass line 21 and the oil system 28. The cavity A of sensor 1 is through a tube 16 and through a spool switch-, relay 3 and cavity B is connected to a pressure oil line 29. The temperature limiter operates as follows. Under normal diesel load, the exhaust gas temperature is set to nominal. In this state, the temperature limiter does not act on the angular lever 30 of the throttle speed regulator. As the load increases beyond the nominal temperature, the exhaust gas temperature rises, as a result, the tube of the thermosensitive element 5 opens the valve 8 through the adjusting device 10. At this, the pressurized oil enters through the conduit 29 into the annular cavity E of the spool, pipe 16, into the cavity A, from which , swarm through the open valve 8 into the cavity B, and then into the cavity G of the actuator 2. In the cavity Г the pressure is lifted, the cover 13 of the bellows 12, compressing the spring 15, moves the angular lever 30, which moves the dozor 31 Vania fuel supply (rail fuel pump 32), reducing the flow of fuel into the cylinders of a diesel engine, i.e., with this MBMan, the fuel supply is controlled by a temperature limiter. When the load is restored to the minimum, the temperature of the exhaust gases decreases, and the valve 8 blocks the access of oil to the cavity G. The pressure in the cavity D decreases, and under the action of the spring 15 the lid 13 of the bellows 12 with its stem returns to its former position, the oil is forced out. cavity G through the throttle 33V gsgatlosystem 28 diesel. The further regulation of fuel delivery is carried out by a regular diesel engine speed regulator. If necessary, the diesel engine can be overloaded (within the limits of the set value). For this purpose, through the cyiu-tion diesel fuel supply control mechanism, move the spool 17 by the pusher 20 in the direction of the arrow L, deform the spring 18 and 19. In this case, the sensor cavity A is disconnected from the pipeline 29, and the cylinder 23 through the pipe 21 and the throttle 26 communicate with the pipe 29 through the annular cavity of the D spool. Due to the increase in fuel supply to diesel cylinders, the temperature of the spent pelvis increases and, if the load increases to the maximum overload mode, the central tube of the temperature-sensitive element 5 lengthens the valve 8 to select the clearance C, and then opens the valve 9, and the oil from the cavity B passes into the cavity B further along the pipeline into the cavity G using an alert mechanism 2. In cavity G, pressure increases, and under; . by force of the cap 13 of the bellows 12, the rail 31 of the fuel pumps 32, moving, limits the flow of fuel to the cylinders. From the moment the spool switches to diesel overload mode, oil enters through the conduit 29 into the annular cavity D, through the throttle washer 26 into the cylinder 23. At the same time, the oil level in the cylinder 23 rises, expelling air through the valve 24; and then, as soon as the valve closes, the pressure in the cylinder and in the cavity W grows, due to the end of the expiration of the operating time in the established mode, the pressure reaches the value under which the spool moves to its original position in the direction of the arrow K. with overheating: the pusher 20 is released, under the action of the spring 19 the valve 17 moves to the initial position and the engine switches to the specified mode of operation. In order to stabilize the oil pressure, a re: duction valve 34 is installed in the pipe 29. Claims of the invention The exhaust gas temperature limiter according to ed. St. No. 578484, characterized in that, in order to improve the device, the bypass line is provided with a hydraulic clock.