SU1539370A1 - Electrically controlled pump-cum-nozzle - Google Patents

Abstract

The invention makes it possible to optimize the fuel injection performance by increasing the speed of opening and closing of the injection valve. The valve is designed in the form of a spool and at the same time as an electrically controlled spool valve. When the distributor actuates, the fuel from the supply line is directed to the pressure multiplier, and from it under the injection pressure through the spool valve to the spray ports. When the control valve signal stops, the distribution valve stops supplying the fuel to the spray valves The pump-nozzle is equipped with a check valve in the filling line of the discharge cavity, as well as a pressure multiplier damper. 1 hp f-ly, 1 ill.

Description

The invention relates to engine engineering and is intended to inject fuel into an internal combustion engine, preferably diesel.

The aim of the invention is to optimize the fuel injection performance by increasing the speed of opening and closing of the injection valve.

The proposed design prevents the battery from being drained through the injector pump when the shut-off valve hangs.

The drawing shows a diagram of an electrically-controlled pump-injector.

A pump nozzle consists of a housing 1, an injection valve with a shut-off element 2, which is simultaneously a two-position spring-loaded spool distribution, in which radial channels 3 and an axial channel 4 are placed. The pump nozzle contains a drain line 5, an electromagnetic actuator 6, pressure channel 7, pressure cavity 8, spring-loaded plunger 9 with servo piston 10 in the cavity of servo drive 11, damping device 12, pressure line 13 connected to accumulator 14, check valve 15 in inlet channel 16, yuschy channeling duct 17 and the distributor spool raspypivayuschie openings 18.

The electric injector pump contains pressure and drain lines made in the housing, and

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The ability to alternately communicate through a two-position spring-loaded spool valve with an electromagnetic actuator with a servo motor cavity in which the servo piston is located. In the pump-injector housing, there is a discharge cavity with a valve bottom located therein, communicating with the discharge channel and the inlet channel. The inlet channel also communicates with the pumping pipe, is equipped with a check valve, and its outlet opening can be completely blocked by the grommet in the process of injection. The plunger electric and the servo piston are in contact with their ends. A pump nozzle contains an injection valve with a sub-spring-loaded shut-off element that can communicate with its discharge channel at its course and, at the outlet, with sawing holes through radial and axial channels in the element body.

The locking element is rigidly connected or made integral with the spool valve. The servo piston on the side of the servo drive cavity is provided with a damping device.

The electric injector pump operates as follows.

In the initial position, under the action of the spring, the plunger 9 and the servo piston 10 are in the upper position, and the locking element 2 is in the lower position. In this case, all the ends of the servo motor, the plunger and the distributor are operated by the fuel under the pressure of the drain line 5. The spraying1 openings 18 are separated from any fuel channels by the locking element 2.

When a command signal is supplied to the electromagnetic actuator 6 of the spool valve, the control valve and the valve occupy the uppermost position. The control channel 17 of the spool valve is disconnected from the drain line 5 and communicates with the pressure line 13, thereby increasing the pressure in the servo drive 11. Under its action, the servo piston 10 and the plunger 9 perform fuel injection through the pressure channel 7, the radial 3 and the axial 4 channels in the body of the shut-off valve to the sawing holes 18. The check valve 15 prevents the fuel from being forced out into the pressure line. Upon the termination of the force action of the electromagnetic actuator 6 on the element 2, the latter, under the action of the return spring, is lowered to its original position, again connecting the servo drive cavity through the channel 17 to the drain main 5.

The pumping stroke stops, under the action of the spring, the plunger 9 rises, ensuring that the discharge cavity 8 is filled with fuel through the inlet channel 16. When the dead element 2 hangs in the upper position, the cavity of the servo actuator 11 is connected to the pressure line through the control channel 17, position, reQ the inlet duct 16.

Thus, in spite of the communicating discharge channel 7 and the spraying orifices 18, the outflow of fuel from the accumulator through it to 5 pa 14 becomes impossible.

Claims (2)

1. Electrically-controlled injector pump, comprising a housing with spray holes, a pressure and drain lines, a spring-loaded plunger with a servo piston, placed in the housing with the formation of the pressure cavity, connected to the pressure channel, an inlet channel for communication of the pressure line with the pressure cavity , the outlet of which is located with the possibility of blocking it by the plunger in the process of injection, injecting a channel with a spring-loaded shut-off element, the inlet connected to the injection the channel and the outlet to the spraying holes, and a two-position spring-loaded spool valve with an electromagnetic drive, made with the possibility of alternately communicating the servo drive cavity with the pressure or drain lines, in order to optimize the fuel injection characteristics by increase the speed of opening and closing the injection valve, its locking element is designed as a spool with radial and axial channels rigidly connected to the spool valve, and The flow channel is equipped with a check valve. five 0 five 0 five 515393706 2. The pump nozzle according to claim 1, about the TL and - Shen on the side of the cavity is a servo with the fact that the servo port is provided with a damping device.