CN201013503Y - Oil suction line of time control type pulsation diesel injection apparatus - Google Patents
Oil suction line of time control type pulsation diesel injection apparatus Download PDFInfo
- Publication number
- CN201013503Y CN201013503Y CNU200620036864XU CN200620036864U CN201013503Y CN 201013503 Y CN201013503 Y CN 201013503Y CN U200620036864X U CNU200620036864X U CN U200620036864XU CN 200620036864 U CN200620036864 U CN 200620036864U CN 201013503 Y CN201013503 Y CN 201013503Y
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- oil
- oil suction
- piston
- suction
- pump
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- Expired - Fee Related
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Abstract
The utility model relates to an oil suction oil circuit of a time-controlled pulse diesel oil ejector, in particular to a low-pressure oil suction oil circuit used on a time-controlled pulse piston diesel oil ejector, which comprises a pump body of an electronically controlled ejection monoblock pump or an electronically controlled combined pump, and one or more auxiliary oil suction hole oil circuits or oil suction trough oil circuits communicating with a piston chamber are arranged on the cylindrical surface of the piston sleeve mating with a piston on the pump body. Without changing the oil suction of the original oil suction oil circuit via the sectional area of the seal surface of a valve rod, the area of the low-pressure oil suction oil circuit is relatively increased. When the piston sucks oil, the oil simultaneously enters into the piston chamber from the seal surface of the valve rod and the auxiliary oil suction hole oil circuits or oil suction trough oil circuits, thereby the sufficient oil suction is ensured, and while the sufficient oil suction of a multi-cylinder engine is ensured, the phenomenon of simultaneous oil suction of multiple cylinders is avoided, thus reducing the flow rate of the oil supply pump. The utility model ultimately resolves the defects of too rapid oil suction rate of the piston and fast vaporization of oil, which result in the erosive phenomena in the course of oil ejection of a high-pressure oil circuit, affecting the output power of an engine and the lifespan of a high-pressure oil pipe and the ejector, and as a result the erosive phenomena is avoided.
Description
Technical field
The utility model relates to a kind of low pressure oil suction line of diesel oil electric-controlled injection device, especially relates to the oil suction line that is used on the automatically controlled time-based control pulsation of the diesel automobile engine plunger diesel injection device.
Background technique
Based on automatically controlled time-based control pulsation plunger diesel injection device is the product that integrates machine, liquid, electromagnetism.By electronic control unit ECU injection process is controlled in the control of solenoid valve.Its hydraulic part comprises low pressure oil suction line and high-pressure oil feed oil circuit.The prior art monoblock pump has different sealing means with automatically controlled unipump hydraulic circuit, and a kind of is the cone valve sealed type, and another kind is the guiding valve sealed type oil circuit that Delphi company adopts.Any sealed type no matter, the low-voltage fuel that is adopted all is to enter plunger cavity by the valve stem seal face, and all has the valve stem seal face sectional area ratio smaller defect of low pressure oil suction line.It does not replenish the descending volume of vacating of plunger by the fuel oil volume that the valve stem seal face enters plunger cavity, and at this moment, negative pressure will appear in plunger head, and then can produce bubble.Very fast when often causing fuel oil to suck plunger cavity by the velocity ratio of valve stem seal face, in this case, because of its fuel oil static pressure ratio lower, when the saturation vapour pressure that reaches fuel oil or the time, the air of dissolving fuel oil the inside will overflow rapidly, and also can there be the possibility of vaporization in fuel oil, thereby causes high-pressure oil passage cavitation to occur in injection process, and then influences the power output of motor and the life-span of high-pressure oil pipe and injection apparatus.Cavitation can produce many adverse consequencess, as destroying mobile performance, has a strong impact on the fuel injection characteristic of product, and the corrosion of mechanical damage and chemistry takes place in the association cavitation erosion, with damage parts, also can produce strong vibration noise.On the other hand, be subjected to the restriction of valve stem seal face, the oil suction speed of plunger again can not be too fast, can occur the phenomenon of oil suction deficiency too soon, also the cavitation pitting phenomenon can occur.Prior art low pressure oil suction line is because valve stem seal face sectional area is less, another deficiency of bringing is to cause multicylinder engine to move simultaneously easily, cause multi-cylinder oil suction simultaneously, need oil transfer pump that instantaneous bigger flow is arranged like this, and for motor, not only the traffic requirement of oil transfer pump is big, and filter cleaner also will increase, so the flow of electric-control motor oil transfer pump can not be accomplished as the motor oil transfer pump flow that mechanical type diesel injection device is housed little.
Summary of the invention:
The purpose of this utility model is at above-mentioned the deficiencies in the prior art part, provide a kind of and can avoid multi-cylinder oil suction simultaneously, reduce the flow of oil transfer pump, make the oil suction in oil-absorbing process of time-based control pulsation plunger diesel injection device abundant, the low pressure oil suction line of cavitation pitting does not take place.
In order to achieve the above object, the utility model provides, a kind of oil suction line of time-based control pulsation diesel injection device, comprise: the electric-controlled injection monoblock pump or the automatically controlled unipump pump housing is characterized in that: have auxiliary oil-sucking hole oil circuit or the oil suction groove oil circuit that is communicated with plunger cavity more than at least on the cylndrical surface of the plunger bushing that cooperates with plunger on the pump housing.
The utility model has following beneficial effect than prior art.
Proper number and suitably big or small hole or groove that the utility model cooperates suitable position to offer with plunger on the pump housing of time-based control pulsation plunger diesel injection device, not changing original oil suction line, relatively increased the area of low pressure oil suction line by under the thin oil condition of valve stem seal face sectional area.When the plunger oil suction, fuel oil will be simultaneously from valve stem seal face and described hole of opening or groove enter plunger cavity, so both can guarantee that oil suction is abundant, can guarantee that again multicylinder engine is in abundant oil suction, avoid taking place the phenomenon of multi-cylinder oil suction simultaneously, thereby reduce the flow of oil transfer pump.Like this, it is too fast just can fundamentally to solve plunger oil suction speed, and fuel oil is vaporized rapidly, causes high-pressure oil passage the cavitation pitting phenomenon to occur in injection process, influence the problem in the life-span of the power output of motor and high-pressure oil pipe and injection apparatus, avoid the cavitation pitting phenomenon to take place.
Description of drawings
Further specify the utility model below in conjunction with drawings and Examples, but therefore the utility model is not limited among the described scope of embodiments.
Fig. 1 is a tectonic relationship generalized section of the present utility model.
Embodiment
In Fig. 1, be assemblied in the electric-controlled injection monoblock pump or the automatically controlled unipump pump housing 9 in the pump box 4, be shaped on the pump box filler opening 5 that low-voltage fuel enters usually.One sealed low pressure oil pocket 3 is arranged between the pump box 4 and the pump housing 9.The low-voltage fuel that enters low pressure oil pocket 3 enters plunger cavity 7 by the sealing surface 8 of controlling valve rod 1.In order to increase the area of low pressure oil suction line, the position of present embodiment on the plunger bushing of the pump housing and the pump housing fitting surface of plunger fuel sealing band is shaped on auxiliary oil suction line aperture or the oil circuit oil suction groove 2,6 that is communicated with plunger cavity 7 random geometries.Described auxiliary oil suction aperture or oil suction groove can radially be made, and also can obliquely make.The quantity of hole or groove usually can be unrestricted, as long as leave the hole or the slotted eye of proper number, suitable size in the pump housing 9 and the appropriate location of the pump housing fitting surface upper prop plug sleeve of plunger 10 fuel sealing bands.Like this, when plunger 10 oil suctions, fuel oil enters plunger cavity 7 from valve stem seal face 8 and hole or the groove opened simultaneously.So just both guaranteed that oil suction was abundant, and avoided multicylinder engine that the phenomenon of multi-cylinder oil suction simultaneously takes place again.But also reduced the flow of oil transfer pump.
Working principle of the present utility model is: when the descending beginning oil suction of plunger, valve rod 1 sealing surface 8 is opened, initial fuel oil only enters plunger cavity 7 from sealing surface 8, make hole 2,6 when plunger 10 goes downwards to, when exposing, fuel oil also enters plunger cavity 7 by these three holes simultaneously, so just avoid the sealing surface fuel flow rate too fast, bubble occurs.In addition, when plunger oil suction speed was fast especially, the fuel oil volume that enters plunger cavity 7 by valve stem seal face 8 did not replenish the plunger 10 descending volumes of vacating, and at this moment, negative pressure will appear in plunger cavity 7, and then can produce bubble.If under the situation of plunger bushing perforate, will avoid this kind phenomenon.When the up pressure of plunger is oily, the gases in the plunger cavity 7 are flowed out by aperture, avoid occurring the cavitation pitting phenomenon.Perforate also has other advantage, can reduce the flow of oil transfer pump by rational coupling cam profile, and then reduce cost.
Claims (3)
1. the oil suction line of time-based control pulsation diesel injection device, comprise: the electric-controlled injection monoblock pump or the automatically controlled unipump pump housing is characterized in that: have auxiliary oil-sucking hole oil circuit or the oil suction groove oil circuit that is communicated with plunger cavity more than at least on the cylndrical surface of the plunger bushing that cooperates with plunger on the pump housing.
2. the oil suction line of time-based control pulsation diesel injection device according to claim 1 is characterized in that the aperture of described oil-sucking hole oil circuit or oil suction groove oil circuit is a random geometry.
3. the oil suction line of time-based control according to claim 1 pulsation diesel injection device is characterized in that described auxiliary oil suction aperture or oil suction groove can radially make, and also can obliquely make.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200620036864XU CN201013503Y (en) | 2006-12-27 | 2006-12-27 | Oil suction line of time control type pulsation diesel injection apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200620036864XU CN201013503Y (en) | 2006-12-27 | 2006-12-27 | Oil suction line of time control type pulsation diesel injection apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201013503Y true CN201013503Y (en) | 2008-01-30 |
Family
ID=39025290
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU200620036864XU Expired - Fee Related CN201013503Y (en) | 2006-12-27 | 2006-12-27 | Oil suction line of time control type pulsation diesel injection apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201013503Y (en) |
-
2006
- 2006-12-27 CN CNU200620036864XU patent/CN201013503Y/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080130 Termination date: 20141227 |
|
| EXPY | Termination of patent right or utility model |