SU1530801A1 - Nozzle for feeding two types of fuel into diesel engine - Google Patents

Abstract

FIELD OF THE INVENTION The invention relates to engine-building and makes it possible to increase the reliability and durability of the nozzle. A hollow atomizer 4 with shut-off conical seat 5, nozzle holes 6 and supply channels 7 and 8 of the main and pilot fuel having check valves 9 and 10 are mounted on housing 1 with supply channels 2 and 3 of primary and pilot fuel. a spring-loaded locking needle 12, having a guide 13, a cylindrical 14 and a conical 15 locking surface, with the formation of podigolnaya 16 and nagyolnoy 17 cavities. Moreover, the angle at the apex of the cone of the locking surface 15 is less than the angle at the apex of the cone of the saddle 5. In the locking needle 12, an axial channel 18, radial channels 19 and additional radial holes 20 are provided. The latter are placed at the base of the cone of the locking surface 15 and provide the starting fuel to the pit end 16 if during the operation of the nozzle, as a result of the breaking-in of the conical seat 5 and the locking conical surface 15, the firing of the fuel through the radial channels will not be possible. The total area of the holes 20 is 0.0025-0.25 of the total area of the radial channels 19. 1 C, ff, 2 ill.

Description

The invention relates to engine and can be used in fuel injection equipment of diesel engines.

The aim of the invention is to improve the reliability and durability of the nozzle. Figure 1 shows a nozzle, a longitudinal section J. in FIG. 2, node I in FIG. 1.

The nozzle includes a housing 1 with channels 2 and 3 for supplying primary and pilot fuel, a hollow atomizer 4

ten

la 12 under the action of the force of the spring 11 is lowered onto the saddle 5, blocking the access of fuel to the nozzle openings 6. The injection into the pilot fuel engine is stopped

At the operating conditions, the fuel type is supplied to the injector. In this case, the ignition fuel is injected some time ahead. Moreover, the main fuel supply to the nozzle can be carried out as after the end of the injection of the pilot fuel, i.e., when the needle 12 is lowered onto

with a locking conical seat 5, a conical 5 conical saddle 5, and in the process

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left openings 6 and channels 7 and 8 for supplying the main and pilot fuels, having check valves 9 and 10 and communicating with the respective channels of housing 1, and a locking needle 12 loaded with a spring 11, with a guide 13, a cylindrical 14 and a conical locking 15, placed in the cavity of the sprayer 4 with the formation of the undercut 16 and supraspinal 17 cavities, the angle at the apex of the cone of the locking surface 15 is less than the angle at the apex of the cone of the saddle 5, in the needle 12 the axial channel 18 is made, the radial channels 19 end on aperture 15, and another - into an axial channel 18, communicated with channel 8, and additional radial holes 20. placed at the base of the cone of the locking surface 15 and extending at one end to the cylindrical surface 14, and the other in the axial channel 18. Total area The additional radial holes 20 comprise 0.0025-0.25 of the total area of the radial channels 19.

The nozzle works as follows.

In the starting and idling mode, only the pilot fuel is injected into the nozzle. The ignition fuel through channel 3, through the check valve 10, through channels 8, 18 and 19 and holes 20 enters the cavity 16 "When the pressure of fuel in floor 16 reaches more than the pressure of the start of injection, needle 12, breaking the spring force P, rises opening access of the pilot fuel to the nozzle holes 6c, T1 occurs the injection of the pilot fuel into the engine. When you stop the supply of pilot fuel in the nozzle pressure in the cavity 16 drops and ig40

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firing the injection of fuel when the needle 12 is raised. In the first case, the main fuel through channel 2, through the check valve 9 and channel 7 is supplied to the sub-cavity cavity 16, and when the pressure of the main fuel in it exceeds the pressure of the start of injection, the needle 12 rises, opening access of the main fuel to the nozzle openings 6. injection of the main fuel In the second case, the main fuel, mixed with the ignition fuel in the annular gap between the seat 5 and the locking conical surface 15, with the raised needle I2 goes to the nozzle holes 6 and further to the engine.

Additional radial holes 20 allow the intake of the pilot fuel into the sub-cavity 16 if, during the operation of the nozzle, because of the burn-in of the conical seat 5 and the locking conical surface 15, the exit of the pilot through the radial channels 19 is impossible, which increases the reliability and durability of the nozzle .

Claims (2)

1. A nozzle for supplying two types of fuel to a diesel engine, containing a housing with channels for supplying primary and pilot fuels, a hollow atomizer with a closed conical seat, nozzle holes and channels for supplying primary and pilot fuels, with check valves and communicated with the corresponding body channels, and a spring-loaded locking needle with a needle, a cylindrical and conical locking surface, placed in the cavity la 12 under the action of the force of the spring 11 is lowered onto the saddle 5, blocking the access of fuel to the nozzle openings 6. The injection into the pilot fuel engine is stopped At the operating conditions, the fuel type is supplied to the injector. In this case, the ignition fuel is injected some time ahead. Moreover, the main fuel supply to the nozzle can be carried out as after the end of the injection of the pilot fuel, i.e., when the needle 12 is lowered onto 0 five 35 Jq 40 45 50 55 firing the injection of fuel when the needle 12 is raised. In the first case, the main fuel through channel 2, through the check valve 9 and channel 7 is supplied to the sub-cavity cavity 16, and when the pressure of the main fuel in it exceeds the pressure of the start of injection, the needle 12 rises, opening access of the main fuel to the nozzle openings 6. injection of the main fuel In the second case, the main fuel, mixed with the ignition fuel in the annular gap between the seat 5 and the locking conical surface 15, with the raised needle I2 goes to the nozzle holes 6 and further to the engine. Additional radial holes 20 allow the intake of the pilot fuel into the sub-cavity 16 if, during the operation of the nozzle, because of the burn-in of the conical seat 5 and the locking conical surface 15, the exit of the pilot through the radial channels 19 is impossible, which increases the reliability and durability of the nozzle. Invention Formula 1. A nozzle for supplying two types of fuel to a diesel engine, comprising a housing with channels for supplying primary and pilot fuels, a hollow atomizer with a shut-off conical seat, nozzle holes and channels for supplying primary and pilot fuels, with check valves and communicated with the corresponding channels body, and a spring-loaded locking needle with a direction, a cylindrical and conical locking surface, placed in the cavity of the nebulizer with the formation of the podgolny and nagyolny cavities, with the angle The cone of the locking surface is smaller than the angle at the apex of the seat cone, axial and radial channels are made in the needle, radial channels with one end extend to the locking surface, and the other are connected with the axial channel with the pilot fuel supply channel, the arresting cavity is connected , characterized in that, in order to increase reliability and long In the eternity of the nozzle, additional radial holes are placed at the base in the locking needle. the cone of the locking surface and going out at one end to the cylindrical surface and the other to the axial channel 2. The injector according to claim, characterized in that the total area of the additional radial holes is 0.0025-0.25 of the total area of the radial channels. 20 go 0f / e.2