CN201250741Y - Diesel engine equal-pressure fuel injection pump - Google Patents
Diesel engine equal-pressure fuel injection pump Download PDFInfo
- Publication number
- CN201250741Y CN201250741Y CNU2008201001567U CN200820100156U CN201250741Y CN 201250741 Y CN201250741 Y CN 201250741Y CN U2008201001567 U CNU2008201001567 U CN U2008201001567U CN 200820100156 U CN200820100156 U CN 200820100156U CN 201250741 Y CN201250741 Y CN 201250741Y
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- injection pump
- valve
- pressure
- plunger
- diesel engine
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Abstract
The utility model relates to a diesel engine equal-pressure fuel injection pump, comprising a fuel injection pump body with flange, an equal-pressure delivery valve assembly, plunger matching parts, bolts, a rack actuating mechanism and a plunger reciprocating motion mechanism. A delivery valve of the equal-pressure delivery valve assembly is in a plane valve type structure, a pressure reducing valve is in a sliding valve structure, and an upper seat provided with a fuel-displaced connector. The opening pressure of the delivery valve is 1.5 MPa-1.7 MPa, the diameter of the delivery valve is phi 16 mm, the opening pressure of the pressure reducing valve is 12 MPa-12.5 MPa, the diameter of the pressure reducing valve is phi 3.5 mm, and the diameter of a throttling orifice is phi 2 mm. The plunger diameter of the plunger matching parts is phi 28 mm, the plunger stroke is 26 mm, the lead of a helical line is 62.5 mm, and an oil supply terminal adjustment mode is employed. The diesel engine equal-pressure fuel injection pump of the utility model has the advantages of stable operation, reliability, long service life and the like.
Description
Technical field
The utility model belongs to the diesel engine field, is specifically related to a kind of rotating speed 600r/min～720r/min that is applicable to, the isobaric Injection Pump of power per cylinder use for diesel engine in 375kW～450kW scope.
Background technique
The reliability of diesel engine work depends on the reliability of Injection Pump work to a great extent.The traditional combustible substance of diesel engine is a diesel oil, and combustible substance is single, in recent years, can burning diesel oil, can become development of diesel trend by combusting heavy oil again, this structural behaviour to diesel injection pump has proposed higher requirement.Existing diesel injection pump, what its outlet valve and reduction valve were more is to adopt the steel ball valve, and this is for rotating speed 600r/min～720r/min, and it is not optimal selection that power per cylinder diesel engine in 375kW～450kW scope uses.In addition, mostly its plunger coupled parts is to rely on contact with the end face of outlet valve and reaches high pressure sealing and also fix, this fastening very unreliable, under the high-speed motion of plunger, easily produce distortion, the especially distortion of plunger bushing mesopore of pump element, thereby influence the reliability of Injection Pump work.
Summary of the invention
The purpose of this utility model is to propose the isobaric Injection Pump of a kind of diesel engine, strengthens the Injection Pump working stability, the reliability of raising, and length increases the service life.
The technical solution of the utility model is as follows:
The isobaric Injection Pump of this diesel engine comprises flanged (FLGD) fuel injection pump housing, constant pressure delivery valve assembly, plunger coupled parts, bolt and rack gear and plunger reciprocating mechanism etc.The outlet valve of constant pressure delivery valve assembly adopts plane valve formula structure, and reduction valve is a slide-valve structure.Outlet valve act as the supercharging oil road, and play the partition effect of high-pressure oil duct and low pressure oil duct; Year an oil duct and a decompression are let out in acting as of reduction valve, also play high pressure and the effect of low pressure oil duct partition.The advantage of the constant pressure delivery valve comparison of this structure and other form is that outlet valve and reduction valve have better stability and longer life-span and reliability in the high-speed motion process.
Described plunger coupled parts diameter is Φ 28mm, plunger stroke 26mm, and design has leakage-proof structure and pressure lubrication oil duct, adopts the material of especial manufacture and corresponding heat treatment process to make, and is fit to use light, Heavy diesel oil.
Described isobaric Injection Pump profile is that top and the bottom are circle, and the outlet valve seat of honour and fuel injection pump housing fasten as one, and constant pressure delivery valve assembly and plunger coupled parts are pressed on the pump housing, reaches high pressure sealing by the highi degree of accuracy rigid plane, does not have gasket seal.
Advantage of the present utility model:
1, this Injection Pump has been owing to adopted plane valve formula outlet valve, sliding valve style reduction valve, makes constant pressure delivery valve assembly good stability in the course of the work, and the life-span is long, and reliability is also higher than General System.
2 guarantee high pressure sealing and realize the fastening of part by clamping bolt locking constant pressure delivery valve assembly and plunger coupled parts sealing surface, make stressed even, guaranteed high-pressure tightness, reduce the distortion of pump element to greatest extent, especially the distortion of plunger bushing mesopore, thus the reliability that injection pump plunger is worked guaranteed under high rotary speed movement.
3, can burn light oil and heavy oil of this Injection Pump, the system peak pressure that it can bear can have the residual pressure of suitable uniformity up to 140MPa, can guarantee the conformity of each oil supply cylinder rule, avoids secondary injection and intrasystem cavitation pitting.
Description of drawings
Fig. 1 is isobaric Injection Pump section of structure;
Fig. 2 is the section of structure of constant pressure delivery valve assembly;
Fig. 3 is the external form figure of isobaric Injection Pump.
Embodiment
Below in conjunction with the description of drawings present technique;
Referring to Fig. 1, the plunger reciprocating mechanism that the rack gear that this isobaric Injection Pump is made of constant pressure delivery valve assembly 2, plunger coupled parts 3, the pump housing 4, clamping bolt 1, gear ring 5 and tooth bar 6 etc. and roller push rod etc. constitute is formed.Injection Pump is installed on the diesel engine cam case, and the rotation of camshaft promotes the roller push rod to-and-fro motion on it, and the to-and-fro motion of push rod drives fuel feed pump plunger and moves up and down, thereby reaches the purpose of fuel feeding.
Fig. 2 is a constant pressure delivery valve modular construction sectional drawing employed in figure 1, and the outlet valve seat of honour 205 of the constant pressure delivery valve of this Injection Pump is connected with straight pin 202 by screw 201 with fuel-displaced lower valve seat 210, the outlet valve seat of honour 205 double delivery connections.Outlet valve has adopted plane valve formula structure, is made up of fuel-displaced spool 203, oil outlet valve spring 206 and outlet valve pressure regulation sheet 204.Reduction valve has adopted slide-valve structure, is made up of relief pressure valve cartridge 207, pressure-relief valve spring 209 and reduction valve pressure regulation sheet 208.In the plunger delivery stroke, oil pressure in the pump chamber 7 (Fig. 1) raises, and this pressure is born by outlet valve, when this pressure during greater than delivery valve opening pressure, fuel-displaced spool 203 overcomes the elastic force of oil outlet valve spring 206 and lifts, and the fuel oil in the pump chamber 7 is pressed in the high-pressure oil pipe by oil duct 8; After fuel feeding finished, pump chamber 7 became low-pressure cavity, and the high pressure fuel in the high-pressure oil pipe oppositely flows into low-pressure cavity through oil duct 8 and side oil duct 9, and after high pressure oil was lower than a certain setting numerical value, outlet valve cut out.Equally, if the oil pressure in the hyperbaric chamber is because pressure wave transmission and superposition sum when being higher than the reduction valve cracking pressure, then relief pressure valve cartridge 207 overcomes the impacting force of pressure-relief valve spring 209 and lifts, high pressure oil enters low-pressure cavity through oil duct 8, side oil duct 9, oil pressure in the high-pressure oil duct obtains pressure release, each cylinder oil pressure balance.
Delivery valve opening pressure 1.5MPa～1.7MPa, outlet valve diameter phi 16mm, reduction valve cracking pressure 12MPa～12.5MPa, reduction valve sealed diameter φ 3.5mm, throttle orifice diameter phi 2mm.
Fig. 3 is the profile of isobaric Injection Pump shown in Figure 1.
The profile of this Injection Pump is that the upper and lower part is circular, with bolt 1 constant pressure delivery valve assembly 2 and plunger coupled parts is pressed on the fuel injection pump housing 4, reaches the fastening of rigidity high pressure sealing and part.
This isobaric Injection Pump system allowed to bear peak-peak pressure is 140Mpa, and the diesel engine cylinder diameter is that φ 300mm, stroke are 380mm, and rated speed is 600r/min～720r/min, and power per cylinder is in 375kW～450kW scope.
Claims (5)
1, the isobaric Injection Pump of a kind of diesel engine includes flanged (FLGD) fuel injection pump housing, constant pressure delivery valve assembly, plunger coupled parts, rack gear and plunger reciprocating mechanism; It is characterized in that: the outlet valve of described constant pressure delivery valve assembly adopts plane valve formula structure, reduction valve adopts slide-valve structure, the outlet valve seat of honour delivery connection of holding concurrently, delivery valve opening pressure 1.5MPa～1.7MPa, outlet valve diameter phi 16mm, reduction valve cracking pressure 12MPa～12.5MPa, reduction valve sealed diameter φ 3.5mm, throttle orifice diameter phi 2mm; By bolt constant pressure delivery valve assembly and fuel injection pump housing are fastened as one, compress constant pressure delivery valve assembly and plunger coupled parts on fuel injection pump housing, the rigid plane high pressure seal structure of formation.
2, the isobaric Injection Pump of diesel engine according to claim 1, the plunger diameter that it is characterized in that described plunger coupled parts is Φ 28mm, plunger stroke 26mm, the lead of helix is 62.5mm, adopts fuel feeding terminal point regulative mode.
3, the isobaric Injection Pump of diesel engine according to claim 1 and 2 is characterized in that the upper and lower seat of outlet valve of constant pressure delivery valve assembly adopts the screw linkage structure, the inner straight pin location of adopting.
4, the isobaric Injection Pump of diesel engine according to claim 3 is characterized in that the fastening of described constant pressure delivery valve assembly and fuel injection pump housing is directly to be pressed on the fuel injection pump housing by bolt by the outlet valve seat of honour.
5, the isobaric Injection Pump of diesel engine according to claim 4 is characterized in that the Injection Pump top and the bottom are circle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201001567U CN201250741Y (en) | 2008-09-27 | 2008-09-27 | Diesel engine equal-pressure fuel injection pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008201001567U CN201250741Y (en) | 2008-09-27 | 2008-09-27 | Diesel engine equal-pressure fuel injection pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201250741Y true CN201250741Y (en) | 2009-06-03 |
Family
ID=40746415
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008201001567U Expired - Lifetime CN201250741Y (en) | 2008-09-27 | 2008-09-27 | Diesel engine equal-pressure fuel injection pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201250741Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105275691A (en) * | 2015-11-12 | 2016-01-27 | 余姚市舒春机械有限公司 | High-powered environment-friendly diesel engine oil supplying device for ship |
-
2008
- 2008-09-27 CN CNU2008201001567U patent/CN201250741Y/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105275691A (en) * | 2015-11-12 | 2016-01-27 | 余姚市舒春机械有限公司 | High-powered environment-friendly diesel engine oil supplying device for ship |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20090603 |