CN101660472A

CN101660472A - Rotary oil ejector

Info

Publication number: CN101660472A
Application number: CN200910024065A
Authority: CN
Inventors: 张帆
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-09-27
Filing date: 2009-09-27
Publication date: 2010-03-03

Abstract

The invention relates to a rotary oil ejector, in particular to an oil ejecting device for a diesel motor. The rotary oil ejector is more beneficial to mixing and atomization of fuel and air than traditional high pressure oil ejecting systems. The invention adopts the core principle that a permanent magnet stepper motor accurately and regularly controls the oil ejector to do high-speed rotation motion under the control of an electric control device; and high pressure diesel beams go into a motor cylinder in a rotary mode to be burnt for doing work.

Description

Rotary oil ejector

Affiliated technical field

The present invention is a kind of fuel injection apparatus that is used for diesel engine.

Background technique

The fuel injection apparatus of diesel engine to the formation and the burning of mixed gas, all has decisive influence, the title of the heart of intrinsic diesel engine to the power character and the Economy of diesel engine.And oil sprayer is one of vitals of diesel engine fuel oil supply system, and it rationally is distributed with decisive influence to high pressure oil atomization and fuel oil in the firing chamber.

Because diesel engine compression ratio height, the firing chamber is narrow and small, and is flat and complicated, Gu fuel oil is extremely difficult the uniform of firing chamber, cause a part of fuel oil oxygen-enriched combusting to generate nitride easily, and another part fuel oil reducing fire generates black smoke, so the atomizing effect influence greatly.Studies show that with the amount fuel oil, its disperse particle is thin more, and is big more with the air area of contact, its atomizing is just good more.

Summary of the invention

From then on this example sets out, and mainly solves conventional fuel injector fuel injection direction and fixes, and the shortcoming certain with the air area of contact optimized atomizing effect.

This rotary valve-type oil sprayer is compared with existing oil sprayer, its have following some advantage or superior part:

Because the conventional fuel injector oil nozzle is fixed, so the oil bundle is little with the air area of contact, oily thus intrafascicular heart oil atomization effect is relatively poor.And the rotary valve-type oil sprayer has been avoided these, because fluid ejection in the axle rotation, oil bundle movement locus is a curve, increased fluid with the air area of contact, and the kinetic energy of fluid itself, effect strengthened with the air friction atomizing, therefore, the oil atomization effect improves.

This rotary valve-type fuel injector structure is simple, reduced the mechanical complex system of conventional fuel injector, and do not had high-precision mated pair, so processing cost also reduces.Each important moving element of rotary valve-type oil sprayer all has fluid to be lubricated, and has omitted the various wearing and tearing that friction is brought, so has also increased its working life.

Existing various electromagnetic valve type fuel injector power consumption height, and high-frequency oil spout action is high to the magnetic valve performance requirement, causes the oil sprayer cost also to increase accordingly.

Description of drawings

Figure one: permanent-magnet stepping motor 1, and one-level gear shift 2, high speed shaft 3, centrifugal 4, nozzle guard ring 5, oil-feed annular groove 6,, in the slinger 7, hole 8,, spring 9, spring lock screw 10, oil duct 11.

Figure two: oil nozzle 12, nozzle guard ring 13.

Figure three: baffle plate 14, return tube 15.

Specific embodiment

This rotary valve-type oil sprayer mainly contains following several parts and forms: permanent-magnet stepping motor 1 (step angle is 30 °), one-level gear shift 2, high speed shaft 3, centrifugal 4 and nozzle guard ring 5 compositions.Concrete each parts effect is as follows:

Stepping motor 1 is accurately controlled by electric controller, drives high speed shaft 3 by gear shift 2 and does high speed rotary motion.

Have oil-feed annular groove 6 on the high speed shaft 3, the high pressure oil that is provided by common rail enters 7 (for reducing the stepping motor moment of torsion, oil duct symmetric design on the axle) in the slinger by oil-feed annular groove 6.The place has a hole 8 in the big footpath of axle, and the spring centrifugal device is housed in the hole.

This spring centrifugal device (is acquired a certain degree in order to guarantee centrifugal force by spring 9 and centrifugal 4, centrifugal has heavy metal to make) form, so that (fluid is revealed when serving as centrifugal motion of solution in the higher quality of fit load hole, return line is arranged on the hole and has spring lock screw 10 to adjust spring tensions), oil duct 11 is arranged on centrifugal.

The axle lower end is a symmetric arrangement oil nozzle 12, and nozzle guard ring 13 is housed, and guard ring is provided with baffle plate 14 and return tube 15 and cooperates (with three baffle plates is example, and angle is 90 °, and baffle plate accounts for 30 ° of angles) with oil nozzle 12 with highi degree of accuracy, can redistribute angle as required.Its effect has three:

1. accurately controlled by electric controller, the hole of oil nozzle is parked in baffle plate 14 places during end of injection, to avoid oil nozzle 12 obstruction etc. takes place under the combustion condition of complexity.

2. for preventing oil nozzle 12 leakage of oils, the oil return aperture is arranged on the baffle plate, be connected on the oil return circuit of guard ring 13.

3. start and stop to provide buffering for stepping motor to a certain rotating speed.

At first, under the situation of a comprehensive motor running parameter (engine speed, accelerator open degree etc.), electric controller is given stepping motor 1 one drive signals.When the axle high speed rotating and when reaching certain speed, move right under spring force, frictional force that oil liquid pressure causes, centrifugal force force action for centrifugal 4, upper and lower oil duct is identical, and fluid arrives oil nozzle 12, oil nozzle leaves baffle plate 14 simultaneously, enters working state.Then, when all rotating speeds dropped to a certain rotating speed, centrifugal force reduced, and centrifugal 4 resets, and upper and lower oil duct is blocked.Oil spout stops.Oil nozzle 12 is got back to the baffle plate place, and fluid is by the oil circuit oil sump tank.

For making oil nozzle 12 realize twice injection, main jet adds pre-spray.Only need in driving, to allow axle have a urgency to stop getting final product, can realize the pre-spray of 90 ° of integral multiples.The change of fuel injection quantity only needs raising speed by 90 ° of integral multiple decisions that turn over, and the number of degrees that turn in the unit time increase, and fuel injection quantity also increases.

Little by its pressure surge of high-voltage oil liquid that comes in the common rail, so it is minimum to produce change in friction force for centrifugal 4 under oil liquid pressure, the setting spring pulling force is slightly larger than frictional force, has only when centrifugal force reaches a certain value with rotation speed change, and centrifugal 4 just can be moved.And because centrifugal 4 very little, spring system can not produce obvious vibrations generally speaking, and centrifugal 4 bottom surface sealing of frictional force is fabulous, and system is by oil lubrication, and it is very little to wear and tear.

For injection timing, system has added baffle plate 14 as buffering, has well solved the influence of response time when automatically controlled, and injection time can be more accurate.Compole was short when cause was sprayed with, in order to allow the oil bundle and the area of contact of air increase at short notice, improve atomizing effect, so install the rotating speed that one-level gear-shift transmission 2 improves axle additional, require to make its rotating speed high as far as possible in order to reduce to stepping motor 1, so oil nozzle 12 is that 45 ° of two oil spout finedraw formed by paired angle, has eliminated horizontal and longitudinal direction component and be added in moment on the axle.

Considering that no matter the rotary valve-type oil sprayer still is oil nozzle 12 from stepping motor 1, all is the component that existing processing technique can easily be worked it out, and stepping motor is owing to need moment of torsion little less demanding, and type selecting is easy to.The processing method of gear, axle is with very ripe, and widgets such as oil nozzle guard ring can get with processing methods such as castings.To sum up, the oil sprayer cost can be accomplished extremely low.

Claims

1. a rotary oil ejector is installed on the diesel engine, it is characterized in that being subjected to electric controller accurately to carry out work under the control at p-m step motor, and diesel oil sprays into cylinder in the axle rotation.

2. rotary oil ejector as claimed in claim 1 is characterized in that the dedicated gear gear that stepper motor drives, and can be the mechanical gear speed increaser of single-stage or multimachine, also available friction wheel, belt, hydraulic pressure, speedup structure such as pneumatic.

3. rotary oil ejector as claimed in claim 1 is characterized in that the spring in the spring centrifugal device, can become the elastic spring pressure spring according to the position of reality.

4. rotary oil ejector as claimed in claim 1; it is characterized in that several baffle plates being housed at the oil nozzle place; its baffle plate is installed on the guard ring; oil nozzle head and guard ring and baffle plate have close fit; be rotatable closely contact again, when the oil spit hole in the oil nozzle or little finedraw were parked in baffle position, diesel oil can flow back to fuel tank from return tube; after oil spit hole left baffle position in the oil nozzle, the diesel oil bundle became rotation status to enter cylinder to carry out work by combustion.

5. rotary oil ejector as claimed in claim 1 is characterized in that oil spout is that 45 ° oil spout finedraw or oil spit hole formed by paired angle.