CN201152218Y

CN201152218Y - Fuel injector assembly capable of improving engine starting smoke intensity

Info

Publication number: CN201152218Y
Application number: CNU2008200974530U
Authority: CN
Inventors: 李大秀; 王晓斌
Original assignee: CHONGQING FUEL-OIL JET SYSTEM Co Ltd CHINA HEAVY AUTOMOBILE GROUP
Current assignee: CHONGQING FUEL-OIL JET SYSTEM Co Ltd CHINA HEAVY AUTOMOBILE GROUP
Priority date: 2008-01-10
Filing date: 2008-01-10
Publication date: 2008-11-19
Anticipated expiration: 2018-01-10

Abstract

The utility model discloses an oil atomizer assembly which can improve the starting smoke intensity, which comprises an oil atomizer plunger barrel with a fuel check ball valve and an oil atomizer body. The oil atomizer assembly has the innovative points that a spring hole, the position of which is matched with the fuel check ball valve on the oil atomizer plunger barrel, is drilled on the oil atomizer body, and a feeding spring is arranged in the spring hole; the elasticity of the feeding spring directly acts on the fuel check ball valve; after the improvement, diesel oil which is lower than the feeding pressure cannot enter a cylinder through the oil atomizer; the diesel oil is blocked in front of the fuel check ball valve and cannot enter an oil channel at the back of the fuel check ball valve, that is, at the later period of the outage of an engine and after the outage of an engine, the structure can play a good oil sealing performance. The oil atomizer assembly has the advantages that the smoke intensity is reduced when the engine starts, the prior functions of the fuel check ball valve is strengthened and the failure rate that no flameout of the engine caused by that the fuel check ball valve is closed not tightly is reduced.

Description

Can improve the injector assembly of engine starting smoke intensity

Technical field

The utility model relates to a kind of engine fuel injector assembly, relates in particular to a kind of injector assembly that improves engine starting smoke intensity.

Background technique

In real work, behind the engine shutdown, the diesel oil in motor oil duct and the transport pipe very easily enters cylinder by oil sprayer because of fluctuation, thereby accumulates in piston head; In addition, in the engine shutdown process, the diesel oil that sprays into cylinder because of running inertia can not also be accumulated in piston head by compression ignite; When treating engine start, the diesel oil that accumulates in piston head burns together with the diesel oil that newly sprays into, and the diesel oil amount is big when causing burning, air quantity is few, and accumulates diesel oil without atomizing, and it is extremely insufficient to burn, smoke intensity is big when causing burning, and it is big that this situation just is called engine starting smoke intensity.

Cummins Engine PTD type oil sprayer is an open fuel injector, this oil sprayer itself has the fuel oil ball check valve, this fuel oil ball check valve is realized sealing to oil duct by self gravitation, and not bearing the people is the applied external force that applies, i.e. the pressure that provides during fuel oil ball check valve sealing oil duct is little; Behind the engine shutdown; the diesel oil fluctuation that causes because of automobile vibration very easily makes diesel oil back down the fuel oil ball check valve; or in the engine shutdown process; the oil pressure variation that causes because of running inertia also very easily makes diesel oil back down the fuel oil ball check valve; both of these case also can cause sometimes because of the fuel oil ball check valve flame-out fault of motor that is not closed completely except meeting causes the big problem of the described engine starting smoke intensity of leading portion.

Summary of the invention

The utility model provides a kind of injector assembly that improves engine starting smoke intensity, this assembly comprises the oil sprayer plunger bushing and the oil injector body of band fuel oil ball check valve, its innovative point is: on oil injector body, drill through the spring eye that the fuel oil ball check valve on a position and the oil sprayer plunger bushing is complementary, be provided with an oil-feed spring in spring eye, the elastic force of oil-feed spring acts directly on the fuel oil ball check valve.

Described spring eye, its aperture Φ 2.5mm-Φ 5mm, degree of depth 4mm-6mm.

Described oil-feed spring, its Spring Steel Wire diameter of phi 0.15mm-Φ 0.3mm, middle footpath Φ 2mm-Φ 4mm, free length 5mm-8mm.

Useful technique effect of the present utility model is: the smoke intensity when reducing engine start, the original function of reinforcement fuel oil ball check valve reduces because of the fuel oil ball check valve is not closed completely and causes the flame-out rate of fault of motor.

Description of drawings

Accompanying drawing 1, sectional drawing before the utility model improves;

Accompanying drawing 2, fuel oil flow graph before improving;

Accompanying drawing 3, the utility model improve the back sectional drawing;

Accompanying drawing 4 improves back fuel oil flow graph;

In the accompanying drawing: arrow is depicted as the fuel oil flow direction among oil injector body 1, oil sprayer plunger bushing 2, fuel oil ball check valve 3, oil-feed spring 4, spring eye 5, the figure.

Embodiment

Embodiment:

Improve preceding sectional drawing referring to accompanying drawing 1 the utility model, a kind of injector assembly that improves engine starting smoke intensity, this assembly comprise the oil sprayer plunger bushing 2 and the oil injector body 1 of band fuel oil ball check valve 3; Improve the back sectional drawing referring to accompanying drawing 3 the utility model, its improvements are: on oil injector body 1, drill through the spring eye 5 that the fuel oil ball check valve 3 on a position and the oil sprayer plunger bushing 2 is complementary, be provided with an oil-feed spring 4 in spring eye 5, the elastic force of oil-feed spring 4 acts directly on the fuel oil ball check valve 3.

Described spring eye 5, its aperture Φ 2.5mm-Φ 5mm, degree of depth 4mm-6mm.

Described oil-feed spring 4, its Spring Steel Wire diameter of phi 0.15mm-Φ 0.3mm, middle footpath Φ 2mm-Φ 4mm, free length 5mm-8mm.

Improve preceding fuel oil flow graph referring to accompanying drawing 2, Cummins Engine PTD type oil sprayer is an open fuel injector, this oil sprayer itself has fuel oil ball check valve 3, this fuel oil ball check valve 3 is realized sealing to oil duct by self gravitation, not bearing the people is the applied external force that applies, and the pressure that provides when promptly fuel oil ball check valve 3 seals oil ducts is little; Behind the engine shutdown, the diesel oil fluctuation that causes because of automobile vibration very easily makes diesel oil back down fuel oil ball check valve 3, or in the engine shutdown process, the oil pressure variation that causes because of running inertia also very easily makes diesel oil back down fuel oil ball check valve 3.

Start the big problem of smoke intensity for improving Cummins Engine, based on above-mentioned formation reason, consideration increases oiling valve with increase oil-feed resistance on the oil input channel of oil sprayer, make the diesel oil that is lower than certain pressure in the engine shutdown process and after shutting down, and can not enter engine cylinder; Thus, use for reference the working principle of conventional relief valve: the fluid of certain pressure backs down the ball valve by spring precompression control cracking pressure, thereby realizes opening; Consider that comings PTD type oil sprayer itself has fuel oil ball check valve 3, only need increase spring just can, the installing and locating of spring is holed on oil injector body and just can be solved simultaneously, so on oil injector body 1, drill through the spring eye 5 that the fuel oil ball check valve 3 on a position and the oil sprayer plunger bushing 2 is complementary, be provided with an oil-feed spring 4 in spring eye 5, the elastic force of oil-feed spring 4 acts directly on the fuel oil ball check valve 3.

Improve back fuel oil flow graph referring to accompanying drawing 4, after increasing oil-feed spring 4, the diesel oil that is lower than input pressure (pressure that is produced by 4 precompression of oil-feed spring) on fuel oil ball check valve 3 just can not enter cylinder by oil sprayer, promptly in the engine shutdown later stage, because of the diesel oil pressure in the oil duct is lower than input pressure, before diesel oil is blocked on fuel oil ball check valve 3, can't enter the oil duct behind the fuel oil ball check valve 3, thereby coasting there is not oil and can sprays; Behind engine shutdown, the diesel oil in the oil duct does not almost have pressure, and then when fluctuation, diesel oil can not enter cylinder by fuel oil ball check valve 3; After the improvement, through engine test, engine starting smoke intensity reduces greatly, can satisfy motor smoke intensity regulation required value 2.0Rb; Through engine reliability test, these oil-feed spring 4 reliable performances can satisfy startup and proper functioning requirement under the various operating modes of motor; After increasing oil-feed spring 4, strengthened the original function of fuel oil ball check valve 3, greatly reduced because of the fuel oil ball check valve is not closed completely and caused the not flame-out rate of breakdown of motor.

Claims

1, a kind of injector assembly that improves engine starting smoke intensity, this assembly comprises the oil sprayer plunger bushing (2) and the oil injector body (1) of band fuel oil ball check valve (3), it is characterized in that: on oil injector body (1), drill through the spring eye (5) that the fuel oil ball check valve (3) on a position and the oil sprayer plunger bushing (2) is complementary, be provided with an oil-feed spring (4) in spring eye (5), the elastic force of oil-feed spring (4) acts directly on the fuel oil ball check valve (3).

2, the injector assembly that improves engine starting smoke intensity according to claim 1 is characterized in that: described spring eye (5), its aperture Φ 2.5mm-Φ 5mm, degree of depth 4mm-6mm.

3, the injector assembly that improves engine starting smoke intensity according to claim 1 is characterized in that: described oil-feed spring (4), its Spring Steel Wire diameter of phi 0.15mm-Φ 0.3mm, middle footpath Φ 2mm-Φ 4mm, free length 5mm-8mm.