SU1326761A1 - Fuel system - Google Patents

Abstract

The invention relates to engine construction and can be. used in fuel equipment with electrically m control. The aim of the invention is to improve the manufacturability of the system. Work and injection plungers 8 and 9 of the fuel system are separate. The plunger 9 has an annular collar to abut the return spring 22. An axial throttle I is formed in the axial through channel of the plunger 8, which creates a positive pressure differential between the supply line 10 and the control chamber 6. The plungers 8 and 9 are moved. Under the action of increasing pressure in the pressure chamber 7, the inlet valve 19 is closed, and the needle 14 of the atomizer 13 is opened and the fuel is injected 1 sludge. (L 00 N5 05 about:

Description

The invention relates to engine building and can be used in electrically controlled fuel equipment.

The purpose of the invention is to improve the manufacturability.

The drawing shows a constructive diagram of a fuel system with an electrically controlled injector.

The system includes a high pressure pump 1 associated with the battery 2 to which the nozzle 3 is connected, controlled by means of an electromagnetic valve 4. The electric nozzle 3 includes a housing 5 in which the control chamber 6 and the pressure chamber 7 are located cylindrical channels, working 8 and injection 9 plungers placed in the corresponding cylindrical channels of control and discharge chambers 6 7. Nozzle 3 B1 also includes fuel supply line 10 with throttle 11, discharge line 12 connected to the chamber re 6 control, and the solenoid valve 4 installed in the line 12 drain. The power nozzle 3 also contains a spray gun 13 with a needle. 14, separating the aspiration area 15 and the ascending cavity 16, associated with the respective connecting channels 17 and 18 with the control chamber 6 and the injection chamber 7.

The nozzle 3 is equipped with an inlet valve 19, loaded with a spring 20 and installed in line 10 for supplying fuel. Work 8 and injection 9 plungers are made separately, provided with a through axial bore 21 connected to the fuel supply line W, led to the end of the pressure plunger 9 from the pressure chamber 7 and the inlet valve 19 locked at the pressure. The pressure plunger 9 is loaded with a return spring 22. At that, the throttle 11 is made in the axial through channel of the working plunger 8. In the wall of the injection plunger 9 there is a throttle in the form of a radial hole 23 connecting the axial channel 21 with the control chamber 6.

A system with an electrically controlled nozzle operates as follows.

The fuel from the high-pressure pump 1 flows through the accumulator 2 into the fuel supply line 10 and further through the throttle 11, the through axial passage. 21, through an opening 23 in the wall of the injection plunger -: into the control chamber 6 and through the connecting channel 17 into the nadygol cavity 15, and on the other hand, opening the inlet valve 19, fuel enters the injection chamber 7 and through the connecting channel 18 into the hypochondrium 15 the sprayer 13. In the absence of a control pulse applied to the solenoid valve 4, the fuel is drained from the chamber

6, there is no control and the needle 14 is in the closed position due to the force exerted by the force of the naginal cavity 15 acting on the needle 14.

from the side of the premature cavity 16.

When a control pulse is applied to the solenoid valve 4, the control chamber 6 is connected to the drain. Due to the presence of throttles 11, a positive pressure drop is created between the supply line 10 and

 control chamber 6, due to the effect of the force difference on the working plunger 8, it moves downwards and moves the injection plunger 9 under the effect of increasing pressure in the injection chamber 7

5, the valve 19 is closed and the needle 14 of the atomizer 13 is opened and fuel is injected.

When the control pulse is disconnected, the solenoid valve 4 is closed and the fuel drain from the control chamber 6 is stopped. The fuel pressure in the control chamber 6 rises, the injection plunger, together with the working plunger 8, under the action of the spring 22 rises up to the stop and is set to its original position. As the injection plunger 9 moves upward, the intake valve 19 opens and fuel from the axial channel flows into the injection chamber 7. When installing the plungers in the initial position, the fuel pressure in the measure of injection 7 and the axial channel is equalized and the inlet valve 19 is closed by the action of the spring 20.

When the fuel pressure in the control chamber 6 is increased after the electromagnetic valve 4 is closed and the piston 5 moves upwards, the force on the needle 14 acting from above becomes higher than the force from below, which causes the needle 14 of the sprayer 13 to close and the injection process stops.

five

Thus, the use of nozzles with split plungers in the fuel system allows to significantly simplify the manufacturing technology, as well as improve the quality of work.

Claims (1)

Invention Formula A fuel system with an electrically controlled injector for an internal combustion engine, comprising a housing in which the control and injection chambers are coaxially disposed, operating and injection plungers equipped with a spring, a through axial passage and a throttle formed in the form of a radial opening in the injection plunger associated with the chambers control and pumping a sprayer with a needle, located in the pressure chamber of the inlet valve and the discharge line with a solenoid valve, characterized in that, in order to increase the technological awn izgotov213267614 laziness, working and injection plunger for the spring stop, and in the through made separate, and the discharge channel of the working plunger is installed, the dozen piston is equipped with an annular bore throttle.