SU1373854A2 - Forcing valve of fuel injection pump of diesel engine - Google Patents

Abstract

The invention improves engine efficiency by increasing the stability of the residual pressure in the injection pipe. In the axial chamber 2, a spring-loaded bypass element 14 is placed with a guide 15, in which grooves 16 are made. In the bottom 5 of the valve body, an annular protrusion I7 with channel 18, face and outer surfaces 19,20 is made. At that moment, when the pressure in the chamber 2 becomes less than the pressure in the cavity of the nozzle, the element 14 moves away from the protrusion 17, and the fluid through the channel 18 enters the chamber 2, accelerating the return of the locking element 8 to its original position. Element 14 is in contact with the surface 19 and the grooves 16. I Il. (L

Description

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The invention relates to mechanical engineering, namely to engine building, and is an improvement of the invention according to auth. No. 1288334.

The purpose of the invention is to increase the efficiency of the engine by increasing the stability of the residual pressure in the injection pipe.

The drawing shows the proposed valve.

The injection valve of the high pressure fuel injection pump of a diesel engine includes a housing 1 located in a pump nozzle (not shown). An axial chamber 2 is made in the housing, communicated with the nozzle cavity using the connecting channel 3 and the radial channels 4. The housing 1 is provided at one end with a bottom 5, and at the other end with a saddle 6 with a passage 7. The axial chamber 2 has a spool valve 8 with side 9 and end 10 sealing surfaces, provided with a main spring 11. The valve is equipped with a throttle device for changing the flow area of the channel 3 with axial movement of the locking element 8. The throttle device is designed as a collar tsevoy grooves 12 alternating sections on the side surface 9 and the supplemental channel 13, the annular groove 12 permanently communicates with the axial chamber 2 via an additional channel 13 with channel 3 soedinitelnm.

In the axial chamber 2 a spring-loaded bypass element 14 is placed with a guide 15, in which grooves 16 are made. In the bottom 5, an annular protrusion 17 with a channel 18, is formed. the end face 19 and the outer surface 20, the guide 15 being placed on the outer surface 20, and the overflow element 14 is in contact with the end surface 19 and the grooves 16 of the guide 15.

The valve works as follows

In the initial position, the valve maintains the residual pressure in the injection fuel line and the nozzle cavity.

During the plunger stroke until the inlet opening closes, the pressure in the pre-plunger volume begins to increase. It acts on the locking element 8. The throttle device resists the exit of fuel from the axial chamber 2 and inhibits the movement of the locking element 8, therefore a small amount of fuel enters the injection fuel line.

After the pump plunger

closes the inlet, the pressure in the over-batch volume increases dramatically. Under the action of this pressure, the locking element 8 moves, overcoming the force of the spring 11 and the back pressure in the axial

chamber 2. The depth of the annular groove 12 against the connecting channel 3 increases, the resistance created by the throttle device decreases, and the locking element quickly moves to the position at which the radial channels open 4. The fuel from the above plunger volume passes through the passage channel 7, the radial channels 4 enter in the injection fuel line and in the nozzle. When the pressure in the chamber 2 of the housing 1 becomes less than the pressure in the cavity of the nozzle, the bypass element

14 moves away from the annular protrusion 17 and the liquid through the channel 18 enters the chamber 2 of the housing 1, accelerating the return of the locking element 8 to the initial position and helps to stabilize the residual pressure in the nozzle cavity and in the discharge pipe.

Stabilization of residual pressure in injection pipelines

multi-cylinder engine injectors reduce fuel consumption.

Claims (1)

Formula from b.r e te The injection valve of a high pressure fuel injection pump of a diesel engine according to ed. St. 1288334, characterized in that, in order to increase engine efficiency by increasing the stability of the residual pressure in the discharge pipe, the bottom is provided with an annular protrusion provided with end and outer surfaces, the valve is additionally provided with a spring-loaded bypass element and a guide with grooves accommodated on the outer surface of the col 3I37385A tsevogo protrusion, and the bypass contacts with the end surface the element is placed in the guide and the protrusion.