CN208184874U - A kind of diesel engine pluralities of fuel oil spout pump configuration - Google Patents
A kind of diesel engine pluralities of fuel oil spout pump configuration Download PDFInfo
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- CN208184874U CN208184874U CN201820664914.1U CN201820664914U CN208184874U CN 208184874 U CN208184874 U CN 208184874U CN 201820664914 U CN201820664914 U CN 201820664914U CN 208184874 U CN208184874 U CN 208184874U
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Abstract
A kind of diesel engine pluralities of fuel oil spout pump configuration, including plunger, the pump housing, working cylinder duct, pump chamber, free-piston, pressure transmission oil cylinder duct, oil duct, annular lubricant oil groove and into lubricating oil check valve, wherein the one end in pressure transmission oil cylinder duct and pump chamber run through, the other end in pressure transmission oil cylinder duct is equipped with into lubricating oil check valve；Pressure transmission oil cylinder duct is separated into the lubricant reservoir of the pressure transmission chamber and the free-piston other end between one end of free-piston and pump chamber by the free-piston in pressure transmission oil cylinder duct；One end of the oil duct is connected to lubricant reservoir, the other end is connected to annular lubricant oil groove；The structure overcome pluralities of fuel in super-pressure pump oil the problem of fuel leakage, ensure that pump oil pressure reaches 2500bar or more, guarantee the lubrication of plunger, avoid plunger and the wear problem for directly contacting, overcoming plunger and working cylinder duct in cylinder holes road, effectively improve functional reliability and working life.
Description
Technical field
The utility model relates to diesel engine pluralities of fuel fuel pump, specially a kind of diesel engine pluralities of fuel injection pump knot
Structure belongs to technical field of internal combustion engines.
Background technique
The diesel engine thermal efficiency is high, it has also become widely used engine.Since world petroleum resource is reduced year by year, price is big
Width goes up and the emission regulation of various countries is increasingly strict, to adapt to increasingly severeer emission regulation and reducing fuel consumption rate
It is required that and the low viscosities alternative fuel such as dimethyl ether fuel, methanol the market demand, diesel engine need to spray pressure it is higher and
It is suitble to the pluralities of fuel high-pressure injection pump of injection low viscosity alternative fuel.
The Electrocontrolled high-pressure injection system of existing diesel is all using plunger type high-pressure fuel pump, the plunger of high pressure fuel pump
By diesel fuel lubricity and sealing, the method for solving leakage is in the plunger bushing cooperated with plunger in the gap that is slidably matched with plunger bushing
An annular release oil-recovery tank is opened on the hole wall in hole, and the diesel oil of leakage is made to flow back to fuel tank through back oil road from oil-recovery tank；In gap
Quantity of fuel leakage is improved with pump oil pressure to be increased, and serious fuel leakage leads to the superelevation fuel oil for being difficult to set up 2000bar or more
Pressure, current high pressure fuel pump pump oil pressure reach the seldom of 2000bar in 1600~1800bar range.
To meet the requirement for reducing discharge, diesel engine needs to further increase fuel-injected pressure, but quantity of fuel leakage
Increase with pressure rise, high pressure fuel pump fuel oil excessive leakage causes the problem of being difficult to set up super-pressure fuel pressure to be always
Technical problem in the development of diesel engine high-pressure fuel injection system；
As described above, being slidably matched between the plunger and plunger bushing of the plunger type high-pressure fuel pump that existing diesel uses
By diesel fuel lubricity and sealing, when spraying the low viscosities alternative fuel such as dimethyl ether and methanol, the liquid viscosity of dimethyl ether and methanol
(respectively 0.15mm2/ s and 0.6mm2/ s) than liquid viscosity (3~8mm of diesel oil2/ s) it is much smaller, plunger and plunger bushing are quickly
With regard to wear-out failure, lubrication and the sealing of plunger are also that the low viscosities alternative fuel such as DME Used in Diesel Engines, methanol need to solve
Technical problem.
The utility model patent of the applicant, the patent No.: ZL 2,006 2 0127615.1, entitled " pluralities of fuel
Diesel injection pump " using opened on plunger bushing oil groove high-tension lubrication oil seal and lubrication plunger and plunger bushing between
Gap, the oil suction of plunger downlink and the oil cylinder internal combustion of plunger top surface when uplink pump oil due to the plunger pump of diesel electric-controlled injection system
Oil pressure constantly increases and reduces variation, and the pressure difference of alternation variation is more than 1600bar；The extreme pressure lubricant oil pressure of constant pressure, which is higher than, to be become
Lubricating oil enters fuel oil and burn oil occurs, block up the problem of nozzle opening of atomizer when the fuel oil oil pressure of change；Lubricating Oil force down in
When the fuel oil oil pressure of variation, the low-viscosity fuels such as dimethyl ether enter plunger and plunger bushing fit clearance, the column of precision-fit occur
Fill in surface and the abrasion of plunger bushing internal surface of hole and fuel leakage problem.
The patent of invention of the applicant, " the low pressure difference hydraulic sealing type high pressure of Patent No. ZL 2,010 105 27308.3
Common rail fuel pump " it provides and so that plunger is slidably matched the lubricating oil in gap using the structure of minute-pressure difference limen, Simultaneous Pressure lifting
It remains a small pressure difference higher than operating cylinder oil pressure, fuel oil is prevented to enter the structure of fit clearance, effectively overcome
The problem of present existing lubrication of high pressure main plunger pump is with sealing.But structure is more complex, volume is big, is difficult on existing diesel
It installs and uses, consumable material is more, high-precision part is more, manufacturing cost is higher.
The patent of invention of the applicant, Patent No. ZL2011102171364 " a kind of super-high-pressure plunger pump plunger it is close
Seal lubrication system ", the previous patent of invention of the applicant (ZL 2,010 105 27308.3) " low pressure difference hydraulic sealing type is omitted
High-pressure common-rail fuel pump " 9 elements, reduce more than one piece high-precision part, reduce the volume of pump and the consumption of raw material, drop
Low manufacturing cost, and still keep original repertoire；Using Patent No. ZL2011102171364, denomination of invention
A kind of single cylinder diesel pluralities of fuel injection pump of " sealing lubrication structure of super-high-pressure plunger pump plunger " trial production, opens and inspect four
Pump, discovery pressure transmission oil cylinder duct 5 be connected with three oil canals 5.5 end pressure transmission oil cylinder duct 5 end presentation taper, taper
Greatly, closer to connecting pin, diameter is smaller；As shown in Fig. 4, the reason of this quality problems occur is: processing pressure transmission oil har opening
Fabrication hole 17.1 need to be first beaten in one end that pressure transmission oil cylinder duct 5 is connected to oil duct 5.3 when road 5, processing pressure transmission oil cylinder duct 5
Cutter processes downwards pressure transmission oil cylinder duct 5 from fabrication hole 17.1, and there is abrasion on the head of cutter, forms the small conical surface, with processing
Increase, the tool nose abrasion of number increase and taper are presented, and lead to the 5.5 connecting pin pressure transmission of pressure transmission oil cylinder duct 5 and three oil canals
The taper of the wall portion in oil cylinder duct 5 increases, aperture becomes smaller；To guarantee that free-piston 4 can be free in pressure transmission oil har opening 5
Slide and guarantee that leakproofness, fit clearance should be even according to diesel engine fuel injecting pump plunger within the scope of 0.0015~0.0025mm
Part technical conditions JB/T7173.1 require the circularity in free-piston 4 and pressure transmission oil cylinder duct 5 should reach 0.0005mm, taper answer it is small
In 20:0.0006mm；Using the applicant's original patent of invention ZL2011102171364 " a kind of super-high-pressure plunger pump plunger it is close
Seal lubrication system " production diesel engine pluralities of fuel injection pump product, work in-process in order to guarantee pressure transmission oil cylinder duct taper symbol
The requirement for closing national Specification can only constantly replace the cutter of head abrasion, and that there are processing costs is high, the pressure transmission processed
The problem that the diameter in oil cylinder duct 5 is unstable, production efficiency is low.
Summary of the invention
The purpose of the utility model is to overcome original inventions using above-mentioned the applicant, Patent No.
A kind of diesel engine high-pressure injection pump of " sealing lubrication structure of super-high-pressure plunger pump plunger " production of ZL201110217136.4,
Because pressure transmission oil cylinder duct lower end " lubricant reservoir through three oil canals respectively with ring packing oil groove and into lubricating oil check valve connect
It is logical " labyrinth, cause to be difficult to guarantee the machining accuracy of the pressure transmission oil cylinder hole wall in pressure transmission oil cylinder duct and three oil canal connecting ends,
The high problem of manufacturing cost, provide a kind of structure it is simpler, it is easy to manufacture, be easily guaranteed that machining accuracy, manufacturing cost are low, still
The lubrication of plunger can be effectively ensured and sealing, pump oil pressure reach 2500bar or more, burning pluralities of fuel, functional reliability
A kind of good, plunger long working life diesel engine pluralities of fuel oil spout pump configuration.
To realize above-mentioned the purpose of this utility model, applicant is to my former patent of invention ZL201110217136.4 " one
The sealing lubrication structure of kind super-high-pressure plunger pump plunger " further progress " element relationship change ", the innovation of " omitting elements ", hair
A kind of bright diesel engine pluralities of fuel oil spout pump configuration.
The utility model adopts the following technical solution:
A kind of diesel engine pluralities of fuel oil spout pump configuration, including plunger 1, the pump housing 2, working cylinder duct 3, pump chamber 3.1, from
By piston 4, pressure transmission oil cylinder duct 5, oil duct 6.1, annular lubricant oil groove 6 and into lubricating oil check valve 7；Wherein pressure transmission oil cylinder duct
5 one end and pump chamber 3.1 run through, the other end in pressure transmission oil cylinder duct 5 is equipped with into lubricating oil check valve 7；Free-piston 4 is mounted in biography
In pressure oil cylinder holes 5 by pressure transmission oil cylinder duct 5 be separated into pressure transmission chamber 5.2 between one end of free-piston 4 and pump chamber 3.1 and
The lubricant reservoir 5.1 of 4 other end of free-piston；One end of oil duct 6.1 is connected to lubricant reservoir 5.1, the other end and annular lubricant
Oil groove 6 is connected to；
Wherein pump chamber 3.1 is connected through pressure transmission chamber 5.2 with one end of free-piston 4, the other end of free-piston 4 is through lubricating oil
Chamber 5.1, oil duct 6.1 are connected to annular lubricant oil groove 6.
A kind of diesel engine pluralities of fuel oil spout pump configuration, including plunger 1, the pump housing 2, the work cylinder holes being arranged in the pump housing 2
Road 3, pressure transmission oil cylinder duct 5, oil duct 6.1, into lubricating oil check valve 7, the annular lubricant that is arranged on the hole wall in working cylinder duct 3
Oil groove 6, the free-piston 4 in pressure transmission oil cylinder duct 5 are slidably matched with pressure transmission oil cylinder in accurate, and be slidably matched gap
For 0.0015~0.0025 millimeter of annular microgap；Plunger 1 is essence between working cylinder duct 3 in working cylinder duct 3
Close is slidably matched, the annular microgap that the gap that is slidably matched is 0.0015~0.0025 millimeter；The upper top surface of plunger 1 with
The top for the cylinder holes 3 that works constitutes pump chamber 3.1, and annular lubricant oil groove 6 is by the annular microgap between plunger 1 and working cylinder duct 3
Separate are as follows: from annular lubricant oil groove 6 be upwardly into pump chamber 3.1 upper plug annular microgap 9, from annular lubricant oil groove 6 to down toward
The lower plunger ring shape microgap 10 of 3 lower end of working cylinder duct；The one end in pressure transmission oil cylinder duct 5 and pump chamber 3.1 run through, pressure transmission is oily
The other end in cylinder holes road 5 is equipped with into lubricating oil check valve 7；Free-piston 4 in the pressure transmission oil cylinder duct 5, by pressure transmission oil har opening
Road 5 is divided into the lubricant reservoir of the other end of pressure transmission chamber 5.2 and free-piston 4 between one end of free-piston 4 and pump chamber 3.1
5.1；One end of oil duct 6.1 is connected to lubricant reservoir 5.1, the other end is connected to annular lubricant oil groove 6；Pump chamber 3.1 is through pressure transmission chamber
5.2 it is connected with one end of free-piston 4, the other end of free-piston 4 is through lubricant reservoir 5.1, oil duct 6.1 and annular lubricant oil groove
6 connections；
The lubrication in the annular lubricant oil groove 6 of 9 lower end of upper plug annular microgap is kept during 1 uplink pump oil of plunger
Oil pressure PR1P is pressed with the fuel oil in the pump chamber 3.1 of upper endK1It is equal, i.e. PR1=PK1, have in the course of work of 1 uplink pump oil of plunger
Effect the super-pressure fuel oil in pump chamber 3.1 is prevented to enter upper plug annular microgap 9, effectively overcomes super-pressure fuel oil and let out
Leakage problem, to ensure that the diesel engine pluralities of fuel oil spout pump configuration generates the super-pressure injection pressure of 2500bar or more；
Lubricating oil viscosity in annular profit oil-way 6 increases with the viscosity that increases of pressure, due to 10 pairs of lower plunger ring shape microgap height
The throttling action of viscosity lube, only a small amount of lubricating oil are leaked through lower plunger microgap 10 and are flowed back to through profit lubricating oil return pipe 16
Grease-box, the lubricating oil film in lower plunger ring shape microgap 10 make plunger 1 float in work cylinder holes 3, avoid plunger 1
It is directly contacted with work cylinder holes 3, effectively overcomes the wear failure problem of plunger 1 and the cylinder holes 3 that works, improve reliable operation
Property and working life.
A kind of diesel engine pluralities of fuel oil spout pump configuration, it mainly includes plunger 1, the pump housing 2, pressure transmission oil cylinder duct 5 and dress
In the in-oil cylinder free-piston 4 of pressure transmission；Pressure transmission cylinder is divided into pressure transmission chamber 5.2 and lubricating oil oil pocket 5.1 by free-piston 4；It is located at work
Annular microgap between plunger 1 and working cylinder duct 5 is divided into from annular profit by the annular lubricant oil groove 6 made on cylinder holes road 3
Oil groove 6 is upwardly into the upper plug annular microgap of pump chamber 3.1, from annular lubricant oil groove 6 to the lower end down toward working cylinder hole
Lower plunger ring shape microgap；In 1 uplink pump oil of plunger, the fuel pressure of the super-pressure in pump chamber 3.1 through pressure transmission chamber 5.2, from
Annular lubricant oil groove 6 is passed to by piston 4, lubricant reservoir 5.1, oil duct 6.1, makes pump chamber 3.1 and pressure phase in annular lubricant oil groove 6
Deng；A small amount of lubricating oil is released from annular lubricant oil groove 6 through lower plunger ring shape microgap, by the effect of 3.1 intermediate fuel oil pressure of pump chamber,
4 right lateral of free-piston supplements the lubricating oil that annular oil-way is released through lower plunger ring shape microgap, to keep upper prop plug ring
Lubricating oil pressure is equal with the fuel pressure in the pump chamber of upper end in the annular oil-way of shape microgap lower end, prevents in pump chamber
Fuel oil enters upper plug annular microgap, and fuel oil is prevented to leak from upper plug annular microgap；In lower plunger ring shape microgap
Lubricating oil film make plunger work cylinder holes in float avoid plunger with work cylinder holes directly contact, overcome plunger with work
The abrasion of cylinder holes.
The utility model has the beneficial effects that
1, the applicant is to a kind of my former patent of invention ZL201110217136.4 " sealing of super-high-pressure plunger pump plunger
Lubrication system " further progress " element relationship change ", " to count omission " innovation, the oil duct 5.3 in former patent of invention is omitted
One element, the structure that the one end and working cylinder duct 3 in the pressure transmission oil cylinder duct 5 of innovation penetrate through, in processing pressure transmission oil cylinder duct 5
When, the cutter head portion easy to wear for the cutter for processing pressure transmission oil cylinder duct 5 can run off pressure transmission oil cylinder duct 5, to ensure that biography
The machining accuracy in compressing cylinder duct 5, effectively overcoming the original patent of invention ZL201110217136.4 of the applicant, " one kind is super
The sealing lubrication structure of high-pressure plunger pump plunger " present in be difficult to guarantee machining accuracy, the production efficiency in pressure transmission oil cylinder duct 5
Problem low, manufacturing cost is high；The utility model structure is simpler, anufacturability is good, be easily worked, particularly energy is effective
Guarantee the machining accuracy in pressure transmission oil cylinder duct 5, improves production efficiency, reduces manufacturing cost；
2, the utility model diesel engine pluralities of fuel injection pump incomplete structure oil duct one of the applicant's original patent of invention
After element, still keep the original patent of invention ZL201110217136.4 of the applicant " a kind of super-high-pressure plunger pump plunger
Sealing lubrication structure " original repertoire；
(1) it realizes no fuel oil or water leakage, pump oil pressure reaches 2500bar or more；
(2) it is effectively guaranteed the lubrication of plunger, avoids directly contacting, overcoming plunger and work for plunger and cylinder holes road
Make the wear problem in cylinder holes road, effectively improve functional reliability and working life；
(3) structure is simpler, manufacturing cost is lower.
3, the utility model diesel engine pluralities of fuel injection pump is used for diesel engine, can also not only be burnt with burning diesel oil
The low-viscosity fuels such as dimethyl ether, methanol, cellulose ethanol, gasoline.
The diesel engine pluralities of fuel oil spout pump configuration not only increases the pump oil pressure of the high-pressure oil pump of diesel engine, makes pump oil
Pressure reaches 2500bar or more, and can make diesel engine not only firewood oil can also burn the low-viscosities fuel such as methanol；This is practical new
A kind of diesel engine pluralities of fuel oil spout pump configuration of type can also be used in the implementation of super-pressure water pump, chemical liquid high-pressure pump structure.
Detailed description of the invention:
A kind of schematic diagram of diesel engine pluralities of fuel oil spout pump configuration of Fig. 1；
A kind of structural schematic diagram of the embodiment of diesel engine pluralities of fuel oil spout pump configuration of Fig. 2 in oil suction；
A kind of structural schematic diagram of the embodiment of diesel engine pluralities of fuel oil spout pump configuration of Fig. 3 in pump oil；
The lower end in the pressure transmission oil cylinder duct in the sealing lubrication structure of super-high-pressure plunger pump plunger in the prior art Fig. 4 is adding
The schematic diagram of taper is generated in work.
Label in figure indicates are as follows: 1, plunger；2, the pump housing；3, working cylinder duct；3.1, pump chamber；4, free-piston；5, it passes
Compressing cylinder duct；5.1, lubricant reservoir；5.2, pressure transmission chamber；5.4, annular microgap；6, annular lubricant oil groove；6.1, oil duct；7,
Into lubricating oil check valve；8, lubricating oil pipe interface；9, upper plug annular microgap；10, lower plunger ring shape microgap；11, oil inlet
Check valve；12 oil inlet interface tubes；13, oil outlet one-way valve；14 high-pressure oil pipe interfaces；15, tappet roller component and spring cam drive
Motivation structure；16, lubricating oil return pipe；17, fabrication hole；18, technique hole plug；17.1, fabrication hole；18.1, technique hole plug；
5.8, there is the pressure transmission oil cylinder duct hole wall of taper after processing in pressure transmission oil cylinder duct and three oil canal connecting pins.
Specific embodiment
Specific embodiment of the present utility model is further described with reference to the accompanying drawing.
A kind of diesel engine pluralities of fuel oil spout pump configuration of the utility model as shown in Fig. 1, including plunger 1, the pump housing 2,
The working cylinder duct 3 that is located in the pump housing 2, pressure transmission oil cylinder duct 5, oil duct 6.1, into lubricating oil check valve 7, be located at work cylinder holes
Annular lubricant oil groove 6, free-piston 4 on the hole wall in road 3 is in pressure transmission oil cylinder duct 5；The plunger 1 is mounted in work cylinder holes
It is being slidably matched for precision between working cylinder duct 3 in road 3, the gap that is slidably matched is 0.0015~0.0025 millimeter
Annular microgap；The upper top surface of plunger 1 and the top of work cylinder holes 3 constitute pump chamber 3.1；It is located on the hole wall in working cylinder duct 3
Annular lubricant oil groove 6 the annular microgap between plunger 1 and working cylinder duct 3 is separated are as follows: it is upward from annular lubricant oil groove 6
To the upper plug annular microgap 9 of pump chamber 3.1, from annular lubricant oil groove 6 to the lower plunger ring shape of the lower end down toward working cylinder hole 3
Microgap 10；Free-piston 4 is slidably matched in pressure transmission oil cylinder duct 5, with pressure transmission oil cylinder duct 5 in accurate, cooperates
The annular microgap 5.4 that gap is 0.0015~0.0025 millimeter；The one end in pressure transmission oil cylinder duct 5 and pump chamber 3.1 run through, separately
One end is equipped with into lubricating oil check valve 7；Pressure transmission oil cylinder duct 5 is divided into certainly by free-piston 4 in pressure transmission oil cylinder duct 5
By the lubricant reservoir 5.1 of 4 other end of pressure transmission chamber 5.2 and free-piston between one end and pump chamber 3.1 of piston 4；Oil duct 6.1
One end is connected to lubricant reservoir 5.1, the other end is connected to annular lubricant oil groove 6；Pump chamber 3.1 is through pressure transmission chamber 5.2 and free-piston 4
One end be connected, the other end of free-piston 4 is connected to through lubricant reservoir 5.1, oil duct 6.1 with annular lubricant oil groove 6.
To implement to be processed into the oil duct 6.1 of connection lubricant reservoir 5.1 and annular lubricant oil groove 6 in the pump housing 2, on the pump housing
It is fixed provided with the fabrication hole 17 that processing oil duct 6.1 is had to, and after being processed into oil duct 6.1 in the nose end of fabrication hole 17
18 closing process hole 17 of technique hole plug.
It as shown in Fig. 2, is P by the fuel pressure that fuel pump conveying comes in oil inlet interface tube 121, P1=2bar, lubricating oil
Lubricating oil pressure P in interface tube 8RIt is from the defeated next lubricating oil pressure P of diesel lubrication oil ductR, PR=3bar~5bar；When
Pressure when tappet roller component and spring cam driving mechanism 15 drive 1 downlink oil suction of plunger, in pump chamber 3.1 and pressure transmission chamber 5.2
Power PK2For negative pressure, PK2Less than atmospheric pressure P0, P0=1bar, i.e. 0≤PK2≤ 1bar, fuel oil is from oil inlet interface tube 12 through oil inlet
Check valve 11 enters in pump chamber 3.1, lubricating oil is lubricated from lubricating oil pipe interface 8 through entering into lubricating oil check valve 7 at the same time
Oil pocket 5.1 pushes free-piston 4 to contact to left lateral to its left side with the external cylindrical surface of 13 lower end of oil outlet one-way valve and stops left lateral
Until, lubricating oil, lubricant reservoir 5.1 and the oil pressure in oil duct 6.1 and ring packing oil groove 6 are full of in lubricant reservoir 5.1 at this time
For PR, closed into lubricating oil check valve 7；The 9 lower end lubrication pressure P of upper plug annular microgap in oil-absorbing processRWith upper end fuel oil
Oil pressure PK2Maximum differential pressure Δ P9=PR-PK2；PRFor 3~5bar；0 < PK2≤ 1bar, PR> PK2, Δ P9≤ 2bar~5bar；
The lubricating oil oil pressure of the right end of annular microgap 5.4 in oil-absorbing process between free-piston 4 and pressure transmission oil cylinder duct 5 and left end
Fuel oil press pressure differential deltap P5.4=PR-PK2, i.e. the 5.4 both ends maximum differential pressure Δ P of annular microgap of free-piston 45.4=Δ P9,
Test confirms: when 15 millimeters of length, gap are less than 20bar for the pressure difference at the both ends of 0.0025 millimeter of annular microgap, annular
Without flow phenomenon, the lubricating oil in 1 downlink oil-absorbing process of plunger in annular oil-way 6 will not be through upper for lubricating oil in microgap
Plunger annular microgap 9 flows into pump chamber 3.1, and the lubricating oil in lubricant reservoir 5.1 will not flow into pressure transmission chamber through annular microgap 5.4
5.2；Fuel oil is full of in pump chamber 3.1 when plunger 1 comes downwards to lower dead center, in line check valve 11 is closed.
As shown in Fig. 3, when tappet roller component and spring cam driving mechanism 15 drive 1 uplink pump oil of plunger, pump
Fuel pressure P in chamber 3.1K1It steeply rises, oil outlet one-way valve 13 is opened, and pressure is P in pump chamber 3.1K1Super-pressure fuel oil
Fuel injector is pumped into through oil outlet one-way valve 13, high-pressure oil pipe interface 14 and high-pressure oil pipe；Super-pressure in pump chamber 3.1 at the same time
Fuel oil presses PK1Through pressure transmission chamber 5.2, free-piston 4, lubricant reservoir 5.1, oil duct 6.1 is transmitted to annular lubricant oil groove 6, annular lubricant
The lubrication pressure P of super-pressure in oil groove 6R1Equal to the fuel pressure P of the super-pressure in pump chamber 3.1K1, PR1=PK1, i.e. plunger 1
The profit of super-pressure in the donut-type oil grain 6 of 9 lower end of upper plug annular microgap being slidably matched between work cylinder holes 3
Lubricating oil pressure presses fuel oil that is equal, preventing the super-pressure in pump chamber 3.1 to flow into the fuel oil of the super-pressure in upper end pump chamber 3.1
Plunger annular microgap 9 effectively overcomes fuel leakage；Annular microgap 5.4 between free-piston 4 and pressure transmission cylinder 5
Super-pressure fuel oil pressure in left end pressure transmission chamber 5.2 is equal with the super-pressure lubrication pressure in right end lubricant reservoir 5.1, prevents super
High 3.1 oil stream of compression ignition enters annular microgap 5.4；The utility model effectively overcomes pluralities of fuel fuel oil in super-pressure pump oil
The problem of leakage, ensures that pump oil pressure reaches 2500bar or more.
Lubricating oil viscosity increases with pressure rise, due to the section of the lubricating oil big to viscosity of lower plunger ring shape microgap 10
Stream effect, so only a small amount of super-pressure lubricating oil is from annular lubricant oil groove 6 through the leakage of lower plunger ring shape microgap 10, warp
Lubricating oil return pipe 16 flows back to grease-box；With the oil leak in annular lubricant oil groove 6, super-pressure fuel oil in pump chamber 3.1
The lubricating oil for pushing free-piston 4 to leak to right lateral complementary ring shape lubrication groove 6 into pressure transmission chamber 5.2 keeps annular oil-way
Lubricating oil pressure P in 6R1Fuel oil equal to super-pressure in pump chamber 3.1 presses PK1；Lubricating oil in lower plunger ring shape microgap 10
Film make plunger 1 work cylinder holes 3 in float, avoid stay plug 1 with work cylinder holes 3 directly contact, effectively overcome plunger 1 and
The problem of work 3 wear-out failure of cylinder holes.
When plunger 1 goes upward to top dead centre, the pump oil process of 1 uplink of plunger terminates, and oil outlet one-way valve 13 is closed.
When tappet roller component and spring cam driving mechanism 15 drive plunger 1 downlink but also the above-mentioned oil suction of repetition, pump oil not only
Process.
The diesel engine pluralities of fuel oil spout pump configuration keeps upper plug annular microgap 9 in 1 downlink oil-absorbing process of plunger
Lubricating oil oil pressure P in the annular lubricant oil groove 6 of lower endRThan the fuel oil oil pressure P in the pump chamber 3.1 of upper endK2High 2~5bar；?
The lubricating oil of the super-pressure in the annular lubricant oil groove 6 of 9 lower end of upper plug annular microgap is kept during 1 uplink pump oil of plunger
Press PR1P is pressed with the fuel oil of the super-pressure in the pump chamber 3.1 of upper endK1It is equal, PR1=PK1, in 1 downlink oil suction of plunger and plunger 1
The fuel oil in pump chamber 3.1 is effectively prevented to enter upper plug annular microgap 9 in the course of work of row pump oil, effectively gram
Super-pressure fuel leakage problem is taken, to ensure that the diesel engine pluralities of fuel oil spout pump configuration generates 2500bar's or more
Super-pressure injection pressure and without fuel leakage；Lubricating oil film in lower plunger ring shape microgap 10 makes plunger 1 in work cylinder holes 3
It floats, avoids plunger 1 and directly contacted with work cylinder holes 3, effectively overcome plunger 1 and the wear-out failure for the cylinder holes 3 that works is asked
Topic, improves functional reliability and working life.
Finally, it should be noted that the above various embodiments is merely to illustrate the technical solution of the utility model, rather than it is limited
System；Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should
Understand: it is still possible to modify the technical solutions described in the foregoing embodiments, or to some or all of
Technical characteristic is equivalently replaced；And these are modified or replaceed, it does not separate the essence of the corresponding technical solution, and this is practical new
The range of each embodiment technical solution of type.
Claims (2)
1. a kind of diesel engine pluralities of fuel oil spout pump configuration, including plunger (1), the pump housing (2), working cylinder duct (3), pump chamber
(3.1), free-piston (4), pressure transmission oil cylinder duct (5), oil duct (6.1), annular lubricant oil groove (6) and into lubricating oil check valve
(7), it is characterised in that: the one end in pressure transmission oil cylinder duct (5) runs through with pump chamber (3.1), pressure transmission oil cylinder duct (5) it is another
End is equipped with into lubricating oil check valve (7)；The free-piston (4) is in pressure transmission oil har opening (5) by pressure transmission oil cylinder duct (5) point
It is divided into the lubrication of the pressure transmission chamber (5.2) and free-piston (4) other end between one end and pump chamber (3.1) for free-piston (4)
Oil pocket (5.1)；One end of the oil duct (6.1) is connected to lubricant reservoir (5.1), the other end is connected to annular lubricant oil groove (6).
2. diesel engine pluralities of fuel oil spout pump configuration according to claim 1, it is characterised in that: pump chamber (3.1) warp
Pressure transmission chamber (5.2) is connected with one end of free-piston (4), the other end of free-piston (4) is through lubricant reservoir (5.1), oil duct
(6.1) it is connected to annular lubricant oil groove (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820664914.1U CN208184874U (en) | 2018-05-07 | 2018-05-07 | A kind of diesel engine pluralities of fuel oil spout pump configuration |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820664914.1U CN208184874U (en) | 2018-05-07 | 2018-05-07 | A kind of diesel engine pluralities of fuel oil spout pump configuration |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208184874U true CN208184874U (en) | 2018-12-04 |
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| CN201820664914.1U Active CN208184874U (en) | 2018-05-07 | 2018-05-07 | A kind of diesel engine pluralities of fuel oil spout pump configuration |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108412652A (en) * | 2018-05-07 | 2018-08-17 | 郑国璋 | A kind of diesel engine pluralities of fuel oil spout pump configuration |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108412652A (en) * | 2018-05-07 | 2018-08-17 | 郑国璋 | A kind of diesel engine pluralities of fuel oil spout pump configuration |
| CN108412652B (en) * | 2018-05-07 | 2024-01-16 | 梁跃中 | Multi-fuel injection pump structure of diesel engine |
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