SU1240945A1 - Diesel engine fuel nozzle - Google Patents

Description

The invention relates to engine construction and can be used in diesel engines.

The purpose of the invention is to reduce the consumption of ignition fuel.

FIG. 1 shows a nozzle diagram for a diesel engine; in fig. 2 — node I in FIG. one.

The nozzle includes a housing I, a spring 2, a channel 3 for supplying main fuel (low cetane number fuel) with valve 4, a channel 5 for supplying pilot fuel (diesel) with valve 6 and an atomizer 7 with channel 8 for supplying main fuel, channel 9 for supplying ignition fuel to the needle 10 at the site of the groove 11 and variable-section channel 12 for supplying fuel to the pocket 13 of the atomizer 7, the annular groove 14, seat 15, pre-nozzle channel 16 with spray holes 17. The needle 10 in the groove And has an opening 18 pilot fuels that pop gives in the channel 19 and further to the hole 20 on the locking cone.

The diesel injector works as follows.

In the starting and idling mode, only the pilot fuel is injected into the nozzle. Due to the presence of channel 12, the pilot fuel passes into the pocket 13 of the atomizer and lifts the needle 10, while the fuel from the bore 11 through the channel 19 and the opening 20 goes to the spray holes 17, the fuel is injected and the diesel is started. Part of the fuel enters the pre-nozzle during injection

the channel 16 of the pocket 13 of the spray gun 7 through the gap between the annular groove 14 in the housing of the spray gun 7 and the needle 10.

In operating conditions, both types of fuel are supplied to the injector. In this case, the ignition fuel may be injected some time ahead. When the pressure in the pocket of the spray gun 13 exceeds the pressure of the pre-charge of the spring 2, the needle 10 rises and the injection of the pilot fuel fed through the channel 19 to the spray holes 17 begins. The injection of the main fuel in the initial period is limited due to its choking in the gap between

an annular groove 14 and a needle 10. Meanwhile, the intensity of the injection of the main fuel increases, and the pilot one decreases. In this case, the needle 10 rises to a height greater than the height of the annular groove 14. In pocket 13

the atomizer 7 is supplied with the main fuel, which is supplied to the atomizer from the versity 17.

Thus, the invention provides a reduction in the ignition fuel consumption when a diesel engine operates on two fuels, one of which has a low cetane number.

In addition, the implementation of the channel for the supply of ignition fuel to the needle at the point of groove provides high reliability of the precision surfaces of the sprayer.

FIG. 2

Compiled by V. Pavlyukov

Editor M. DylynTehred I. VeresKorrektor V. Bout i a

Order 3468/29 Circulation 523 Subscription

VNIIPI USSR State Committee

for inventions and discoveries

113035, Moscow, Zh-35, Raushsk nab. 4/5

Branch PPP "Patent, Uzhgorod, st. Project, 4

Claims (1)

An INJECTOR FOR DIESEL, comprising a housing with channels for supplying fuel, each of which is equipped with a valve, a spring, a sprayer with channels for supplying ignition and main fuel to its pocket, and a needle made with a groove along a guide connected to the channel for supplying ignition fuel, and with access to a channel for supplying fuel to the locking cone of the nozzle seat, characterized in that, in order to reduce the consumption of ignition fuel, a groove is made in the nozzle located at the base of the locking cone of its seat, and al atomizer for supplying fuel to its ignition pocket is configured with variable cross section, the minimal flow section located at the inlet of the pocket dispenser. (rig 1