CN101555849A - Deformation compensation technology of high-pressure fuel pump of diesel engine - Google Patents
Deformation compensation technology of high-pressure fuel pump of diesel engine Download PDFInfo
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- CN101555849A CN101555849A CNA2008100472651A CN200810047265A CN101555849A CN 101555849 A CN101555849 A CN 101555849A CN A2008100472651 A CNA2008100472651 A CN A2008100472651A CN 200810047265 A CN200810047265 A CN 200810047265A CN 101555849 A CN101555849 A CN 101555849A
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- plunger piston
- diesel engine
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Abstract
Diesel engines develop constantly towards high and strong loading, the discharge requirement of the diesel engines is increasingly strict, and the fuel injection pressure increases accordingly so as to improve the fuel injection atomization quality and the combustion. At present, the fuel injection pressure of a fuel system is 205MPa at most. How to solve the problem concerning the sealing of a high-pressure fuel pump of a diesel engine in an ultra-high pressure working condition is a key technical problem to be solved in the whole diesel engine industry. The invention provides a deformation compensation technology. A compensation groove with an appropriate shape is arranged at the top of a plunger piston, and the radial deformation during the work of the plunger piston is used for keeping a fitting clearance between the plunger piston and a plunger piston sleeve within a proper value range so as to solve the problem concerning the sealing of a matching part of the plunger piston under the ultra-high pressure working condition. The invention is characterized in that the technology can be used for both the design and the structural improvement of the matching part of the plunger piston, the technology can dynamically compensate the deformation of the matching part, further reduce the working clearance of the matching part and satisfy the requirement for the ultra high pressure needed by the establishment of the fuel system of the diesel engine, and the technology is easy to implement and has obvious effect.
Description
Technical field
The present invention relates to a kind of high-pressure service pump plunger coupled parts sealing technique, particularly important to realizing the fuel injection of diesel engine ultrahigh pressure.
Background technique
Diesel engine constantly develops and the emission request increasingly stringent towards high-strength year degree direction, and its injection pressure improves constantly thereupon, to improve the jet atomization quality, to improve burning.The oil-fired system jet pressure is up to 205MPa now, and the rigidity and the sealing of the highest injection pressure allowable and fuel injection system main parts size have extremely close relation, is the principal element that system for restricting pressure further improves.The core component of high pressure oil pump is a plunger coupled parts, and the slip surface between plunger and the plunger bushing belongs to hyperfine processing, requires the gap very little, even under the slow-speed of revolution and high fuel pressure effect, still wants to keep good sealing property and sliding.Be subjected to the restriction of factors such as domestic technology, material, the sealability of plunger coupled parts becomes the key that influences pump delivery pressure index.But along with the raising of fuel pressure, the distortion of high-pressure service pump plunger coupled parts is increased, thereby its radial clearance is increased, increase the leak volume of fuel oil, be difficult to set up fuel injection system, particularly the needed superelevation fuel pressure of electric-controlled co-rail system.
The distortion of plunger coupled parts is can not irrespective key element, and it comprises the gap under even part gap (being machining gap) and the working state under the static no pressure effect.Under the ultrahigh pressure effect, both have very big-difference; Promptly enable just to have when very meticulous machining gap also may not necessarily guarantee work good matching gap satisfying seal request, so matching gap under the reasonably optimizing working state, be the basic key element that plunger coupled parts is finished its function.Utilizing the even part under the ultrahigh pressure deformation-compensated to improve mated condition, is an effective technical way that solves ultrahigh pressure dynamic seal (packing) problem.
Summary of the invention
Realize high pressure and superhigh pressure jetting that 150MPa is above, require the machining gap of plunger coupled parts will reach 2 μ m～3 μ m, and domestic lower machining level and materials science level are difficult to satisfy this processing technology requirement; Distortion under the plunger coupled parts working state simultaneously is bigger, and therefore the gap under even part machining gap and the working state exists difference, can not satisfy the seal request of diesel engine high-pressure pump ultrahigh pressure work.By FEM (finite element) calculation, in working order down, plunger bushing produces big lateral extrusion distortion under the effect of high pressure fuel; Plunger the driving force of high pressure fuel, camshaft and with the acting in conjunction of side fuel pressure under, produce the lateral extrusion distortion on the one hand, produced slight radial contraction at the fitted seal band place of even part on the other hand, the deformation of plunger and plunger bushing makes the work matching gap of even part increase, and is difficult to satisfy the requirement of oil-fired system to excellent sealing under the plunger coupled parts working state.
For solving this technical problem the inventor " deformation compensation technology " proposed, promptly process the hole-compensating tank of a suitable shape in plunger top portion, be full of therebetween by introducing high pressure fuel, produce certain radial deformation, owing to this radial deformation has the advantages that the distortion along with fuel pressure and plunger bushing increases, make the matching gap of even part can remain on an appropriate number range, thereby realize the not dynamic seal (packing) of the plunger coupled parts of clamping stagnation condition.Use modern design theory and computational methods simultaneously, can be optimized design, realize that favorable sealing property and the power performance of plunger coupled parts in full range of working pressure is stable, satisfy the job requirement of superpressure oil pump technological scheme.
When design of high pressure oil pump plunger coupled parts and plunger coupled parts architecture advances, use this technology, can be under the situation of the requirement that suitably reduces the mating plate machining gap, further reduce the gap under the even part working state, both increased the wear-resisting nargin of even part, promote even part working life significantly, improved the sealability of even part under the ultrahigh pressure operating conditions again.This technology is simple and easy to do, and the research benefit is huge, and popularizing application prospect is very wide.
Description of drawings
Below in conjunction with accompanying drawing present technique is further specified.
Fig. 1 is the assembling schematic representation of high-pressure fuel pump of diesel engine plunger coupled parts, and by plunger (1) pumping in plunger bushing (2), the fuel oil in the plunger cavity (3) is compressed into the required high pressure of diesel fuel system.
Shown in Figure 2 is the structural drawing of opening a cylindrical compensating tank (4) at the top of plunger (1);
Shown in Figure 3 is the structural drawing of opening a taper compensating tank (4) at the top of plunger (1);
Shown in Figure 4 is the structural drawing of opening a stepped shaft compensating tank (4) at the top of plunger (1).
Embodiment
Concrete technological means is by the analysis to dynamic sealing technology, carry out the finite element simulation modeling and the analysis of plunger coupled parts fluid and structure field working procedure, calculate the even part distortion under the solid coupling condition of stream, mating plate carries out Optimal Structure Designing, last determines that according to the requirement of the physical dimension of pressure distribution and plunger and processing technology coupled columns fills in the scheme of the structural reverse compensation of row again.Several schemes as shown in Fig. 2,3,4, open a compensating tank (4) at plunger (1) top, like this in even part working procedure, the high pressure fuel generation that enters in the plunger head groove is carved the pressure of its expansion, make plunger produce certain amount of radial expansion with axial gradient, thereby the counteracting of part is inhomogeneous because of the plunger axial deformation that the fuel oil extruding causes, and finally makes even part matching gap remain in the appropriate number range.This method, maximum characteristics are, by compensating tank matching gap amount of deformation of realizing and the matching gap amount of deformation that causes by the narrow gap flow pressure gradient, all be positively related with plunger cavity pressure, structure is handled well, can realize the deformation-compensated of total pressure scope, thereby solve the sealing problem of even part under the ultrahigh pressure operating conditions.
Claims (2)
1. the sealing technique of a high-pressure fuel pump of diesel engine plunger coupled parts, its technical characteristics is: according to this pressure distribution, coupled columns is filled in the structural reverse compensation of row, at compensating tank of plunger top portion processing, the radial deformation when utilizing plunger work makes the matching gap of itself and plunger bushing an appropriate number range.
2. sealing technique according to claim 1 is characterized in that: the form that adopts cylindrical hole, shoulder hole or the cone shape hole being convenient to process at the compensating tank of plunger head.The diameter of fluting and the degree of depth are determined by the physical dimension of concrete plunger coupled parts and the operating conditions of high-pressure service pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100472651A CN101555849A (en) | 2008-04-09 | 2008-04-09 | Deformation compensation technology of high-pressure fuel pump of diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008100472651A CN101555849A (en) | 2008-04-09 | 2008-04-09 | Deformation compensation technology of high-pressure fuel pump of diesel engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101555849A true CN101555849A (en) | 2009-10-14 |
Family
ID=41174091
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2008100472651A Pending CN101555849A (en) | 2008-04-09 | 2008-04-09 | Deformation compensation technology of high-pressure fuel pump of diesel engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101555849A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105370465A (en) * | 2015-12-11 | 2016-03-02 | 中国北方发动机研究所(天津) | Deformable compensation type high-pressure variable pump plunger |
| CN107061091A (en) * | 2017-06-03 | 2017-08-18 | 成都威特电喷有限责任公司 | The piston component of adaptive equalization couple fit clearance circumferential weld deformation |
| CN109176162A (en) * | 2018-10-23 | 2019-01-11 | 上海沪东造船油嘴油泵有限公司 | A kind of fuel oil plunger matching parts processing method |
-
2008
- 2008-04-09 CN CNA2008100472651A patent/CN101555849A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105370465A (en) * | 2015-12-11 | 2016-03-02 | 中国北方发动机研究所(天津) | Deformable compensation type high-pressure variable pump plunger |
| CN107061091A (en) * | 2017-06-03 | 2017-08-18 | 成都威特电喷有限责任公司 | The piston component of adaptive equalization couple fit clearance circumferential weld deformation |
| CN109176162A (en) * | 2018-10-23 | 2019-01-11 | 上海沪东造船油嘴油泵有限公司 | A kind of fuel oil plunger matching parts processing method |
| CN109176162B (en) * | 2018-10-23 | 2019-09-24 | 上海沪东造船油嘴油泵有限公司 | A kind of fuel oil plunger matching parts processing method |
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| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20091014 |