CN108167100A - A kind of constant pressure delivery valve structure of reliable high pressure sealing - Google Patents
A kind of constant pressure delivery valve structure of reliable high pressure sealing Download PDFInfo
- Publication number
- CN108167100A CN108167100A CN201711261811.7A CN201711261811A CN108167100A CN 108167100 A CN108167100 A CN 108167100A CN 201711261811 A CN201711261811 A CN 201711261811A CN 108167100 A CN108167100 A CN 108167100A
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- Prior art keywords
- delivery valve
- ring face
- high pressure
- bolt
- hollow bolt
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
- F02M59/46—Valves
- F02M59/462—Delivery valves
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
The invention discloses a kind of constant pressure delivery valve structure of reliable high pressure sealing, including：Press hollow bolt (1) and be arranged on the hollow interior fuel-displaced valve body of bolt, press hollow bolt (1) bottom connection plunger bushing (3), press hollow bolt (1) bottom to be pressed in the set of plunger bushing (3) on step, press hollow bolt (1) bottom end face for annular surface, the annular surface includes inner ring face and outer ring face, inner ring face is taper surface, outer ring face is plane, outer ring face is contacted with step in the set of plunger bushing (3), realizes rigid seal.The present invention replaces former big plane sealing structure using facet sealing structure, parts material and heat treatment mode are improved simultaneously, Diesel high compression engine leakage problems can effectively be solved, the plunger matching parts clamping stagnation caused by plunger bushing deforms is solved the problems, such as simultaneously, while this high pressure seal structure can improve dynamic property, economy, stability and the reliability of diesel engine work.
Description
Technical field
The invention belongs to diesel engine fuel injecting technical field of structures, are related to a kind of constant pressure delivery valve knot of reliable high pressure sealing
Structure.
Background technology
Delivery valve matching parts are one of important precision pairs of injection pump, to control high-pressure system residual pressure, oil spout when
The influences such as quarter, fuel injection characteristic, speed characteristics are very big, can be divided into etc. by its operation principle and hold delivery valve, constant pressure delivery valve and damping
Three kinds of patterns of delivery valve.
Deng hold delivery valve, structure as shown in Figure 1, its main feature is that have below sealed seat surface a circle depressurize band, and with it is close
Retraction volume is collectively formed in envelope band.At the end of pump oil, delivery valve is taken a seat, and conceding one to high-pressure system is equivalent to retraction volume
Space makes pressure prompt drop in high-pressure system, secondary injection caused by prevent pressure wave reflection.
With the continuous improvement of Fuel Injection Pressure of Diesel Engines, constant volume type delivery valve does not adapt to gradually, it is therefore desirable to using etc.
Pressure type delivery valve, structure are as shown in Figure 2.The characteristics of constant pressure delivery valve is in the groups such as the built-in constant pressure valve of delivery valve and spring
Into one-way valve member.After pump oil, delivery valve is closed, if pressure is higher than the Opening pressure of check valve in high-pressure system, etc.
Pressure valve is opened, and system pressure reduces；Conversely, then constant pressure valve is closed.I.e. under each operating mode, system residual pressure can after fuel feeding
Automatic adjustment, to keep positive value.It has the reduction with rotating speed, the speed characteristics that fuel delivery per cycle significantly increases, i.e. torque school
Positive characteristic.
Damping delivery valve is constituted after filling an orifice valve on appearance delivery valve is waited.Delivery valve is opened during fuel feeding, orifice valve gram
It takes damping spring power and rises, fuel oil enters high-pressure oil pipe；After fuel feeding, orifice valve is closed rapidly before delivery valve is taken a seat,
Throttle orifice only in orifice valve leads to oil.
Certain diesel engine gradually exposes rotating speed out of control and injection pump ring flange and plunger bushing junction in use
The problems such as oil leak, concrete analysis are as follows：
To ensure that delivery valve presses the reliable sealing between hollow bolt and plunger bushing, need especially to note two positions
Meaning, i.e.,：1. delivery valve presses the sealing of copper packing between hollow bolt and plunger bushing platform；2. ring flange and plunger bushing top surface are close
Envelope.It is illustrated in fig. 3 shown below：
1st, before improving delivery valve press the sealing structure of hollow bolt and plunger bushing there are the problem of：
1. in order to there is preferable sealing effect, press hollow bolt and usually require larger screw-down torque, twisted in larger
Under clamp force square, the easy pressure break of copper packing and sealing structure is caused to fail.
2. ring flange position also results in plunger bushing deformation under big screw-down torque, plunger is stuck.
Plunger bushing head is caused to be plastically deformed after plunger bushing is screwed into 3. pressing hollow bolt, make plunger and plunger bushing
Between gap become smaller, plunger the course of work there are head surface abrasion, peel off hidden danger, plunger card will occur when serious
Stagnant phenomenon.
4. the higher machining accuracy of plunger bushing will also result in processing cost increase, yields reduces.
2nd, delivery valve presses influence of the sealing structure of hollow bolt and plunger bushing to complete machine before improving：
1. the leakage of injection pump high pressure oil can cause injection pump pump end pressure to reduce, pump end pressure reduction will make fuel injector
Atomization quality declines, and combustion process deteriorates, and influences Diesel Engine Complete Machine dynamic property and economy.
2. plunger clamping stagnation can seriously reduce diesel engine reliability of operation and stability.
Invention content
(1) goal of the invention
The purpose of the present invention is：A kind of constant pressure delivery valve that reliable high pressure seal structure can be achieved is provided, by improving out
Fuel tap presses hollow bolt sealing structure, improves the distribution of plunger bushing top surface pressure-bearing position fluid power, solves column high pressure fuel leak, column
Plug sleeve problem on deformation improves injection pump oil outlet valve component use reliability.
(2) technical solution
In order to solve the above technical problem, the present invention provides a kind of constant pressure delivery valve structure of reliable high pressure sealing, packets
It includes：Press hollow bolt 1 and be arranged on the hollow interior fuel-displaced valve body of bolt, press 1 bottom of hollow bolt connection plunger bushing 3, tightly
1 bottom of pressure hollow bolt is pressed in the set of plunger bushing 3 on step, presses 1 bottom end face of hollow bolt for annular surface, the annular
Face includes inner ring face and outer ring face, and inner ring face is taper surface, and outer ring face is plane, and outer ring face connects with step in the set of plunger bushing 3
It touches, realizes rigid seal.
Wherein, the cone angle in the inner ring face is 6 °~8 °.
Wherein, the width in the outer ring face is 0.9mm-1.2mm.
Wherein, the cone angle in the inner ring face is 8 °.
Wherein, the width in the outer ring face is 1mm.
Wherein, the material for pressing hollow bolt is 40Cr.
Wherein, the hollow bolt that presses carries out 500 DEG C of -600 DEG C of high temperings after quenching by modifier treatment.
Wherein, it is described press be connected through a screw thread between hollow bolt 1 and plunger bushing 3.
Wherein, the plunger bushing 3 is mounted on when pressing on hollow bolt 1, screw-down torque 150N.m-180N.m.
Wherein, it further includes：Ring flange 2 mounted on 1 middle part of hollow bolt is pressed, is interference fitted with pressing hollow bolt 1.
(3) advantageous effect
The constant pressure delivery valve of achievable reliable high pressure seal structure that above-mentioned technical proposal is provided, is sealed using facet
Structure replaces former big plane sealing structure, while parts material and heat treatment mode are improved, and can effectively solve height
Diesel engine leakage problems are pressed, while and solve the problems, such as the plunger matching parts clamping stagnation caused by plunger bushing deforms, while this high pressure sealing
Structure can improve dynamic property, economy, stability and the reliability of diesel engine work.
Description of the drawings
Fig. 1 holds delivery valve structure diagram for a kind of wait in the prior art.
Fig. 2 is a kind of constant pressure delivery valve structural diagrams in the prior art.
Fig. 3 is that delivery valve presses hollow bolt before improving in the prior art and the sealing structure of plunger bushing illustrates.
Fig. 4 is constant pressure delivery valve structural diagrams of the embodiment of the present invention, and wherein B figures are the partial enlarged view in A figures.
Fig. 5 is illustrated for constant pressure delivery valve structure of embodiment of the present invention use state.
Specific embodiment
To make the purpose of the present invention, content and advantage clearer, with reference to the accompanying drawings and examples, to the tool of the present invention
Body embodiment is described in further detail.
With reference to shown in Fig. 4 and Fig. 5, the present embodiment constant pressure delivery valve structure includes pressing hollow bolt 1 and is arranged on bolt
Fuel-displaced valve body in hollow presses 1 bottom of hollow bolt connection plunger bushing 3, presses 1 bottom of hollow bolt and be pressed on plunger bushing 3
Set on step, press 1 bottom end face of hollow bolt for annular surface, which includes inner ring face and outer ring face, inner ring face
For taper surface, outer ring face is plane, and outer ring face is contacted with step in the set of plunger bushing 3, realizes rigid seal.
Wherein, the cone angle in inner ring face is 6 °~8 °, i.e. the angle of inner ring face and horizontal plane is 6 °~8 °.
The width in outer ring face is 0.9mm-1.2mm.
Preferably, the cone angle in inner ring face is 8 °, and the width in outer ring face is 1mm.
Press the structure design of hollow bolt bottom end face, forming band with facet replaces the big flat seal of original structure
Face due to the reduction of bearing area, makes normal pressure suffered on plunger bushing unit area increase and make sealing surface far from plunger
Center, dispersive stress reduce the deformation extent of plunger bushing.
Press the material of hollow bolt for 40Cr, press hollow bolt by modifier treatment, increase the intensity, hard of part
The comprehensive mechanical performances such as degree, wearability and impact flexibility.Modifier treatment is to carry out 500 DEG C -600 after pressing hollow bolt quenching
DEG C high tempering, the purpose is to crystal grain thinnings, and obtaining uniformly has certain spread and returning with excellent combination mechanical performance
Fiery sorbite.40Cr materials have preferable comprehensive mechanical property in itself, after modifier treatment, as fastener, in hardness, ontology
There is preferable performance in terms of intensity and resistance to deformation, suitable for pressing hollow bolt.Consider simultaneously from the material cost, be relatively suitble to criticize
Measure production application.
Press and be connected through a screw thread between hollow bolt 1 and plunger bushing 3, plunger bushing 3, which is mounted on, to press on hollow bolt 1
When, screw-down torque 150N.m-180N.m, screw-down torque is small, and band cannot be effectively formed, will oil leak, screw-down torque mistake
It is big to will result in plunger bushing cracking and deformation.
This embodiment scheme uses rigid seal structure, cancels the copper gasket between former hollow bolt and plunger bushing, directly
It connects use and presses hollow bolt and be sealed.
The present embodiment constant pressure delivery valve structure further includes：Ring flange 2, mounted on 1 middle part of hollow bolt is pressed, with pressing sky
Heart bolt 1 is interference fitted.
The release effect of the present embodiment delivery valve structure is what is realized by the pressure-relief valve in fuel-displaced valve core, works as plunger
After plunger bushing oil return hole is opened, delivery valve valve land cuts off height pumping cavity, and the pressure difference of high and low pressure oil pocket is more than at this time
The Opening pressure of pressure-relief valve, pressure-relief valve are opened, and the oil of high pressure chest runs through pressure-relief valve and flows back to low pressure chamber, makes the oil pressure of high pressure chest
It is rapid to decline, have the function that release after height pumping cavity pressure difference is dropped to less than release valve opening pressure, steel ball in pressure-relief valve
It takes a seat, height pumping cavity is cut off, after making the pressure almost constant oil-break of high pressure chest oil, when the pressure wave of high-pressure system passes to
End is pumped, when making pressure difference higher than Opening pressure, pressure-relief valve can be again turned on release, reduce the reflection of pressure wave.Constant pressure delivery valve
Without pressure-reducing ring band, be conducive to first delay the fuel supply rate curve to rise suddenly after liter, and make the movement travel of delivery valve spool smaller, spool
Service life increases.
The present invention has following distinguishing feature it can be seen from above-mentioned technical proposal：
1st, cone angle annular sealing strip is determining.
Band taper sealing band structure can realize reliable sealing under the action of torque.Relatively narrow seal band can incite somebody to action
Smaller torque is converted into larger compression, realizes linear sealing；Cone angle can ensure under moment loading that bolt body is real again
Now higher reliability, while reduce the harmful effect that bolt Zona transformans comes.
2nd, press determining for hollow bolt screw-down torque.
Suitable Tightening moment not only improves the reliable sealing of realization, there is the change that can reduce part noumenon under power effect
Shape ensures that parts have higher reliability.
3rd, press determining for hollow bolt material and heat treatment mode.
Press hollow bolt as what fastener used, need preferable processing performance, higher hardness and preferable
Intensity.
The above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, several improvement and deformation can also be made, these are improved and deformation
Also it should be regarded as protection scope of the present invention.
Claims (10)
1. a kind of constant pressure delivery valve structure of reliable high pressure sealing, which is characterized in that including：Press hollow bolt (1) and setting
Fuel-displaced valve body in bolt is hollow presses hollow bolt (1) bottom connection plunger bushing (3), presses hollow bolt (1) bottom and support
It is pressed in the set of plunger bushing (3) on step, presses hollow bolt (1) bottom end face for annular surface, which includes inner ring face
With outer ring face, inner ring face is taper surface, and outer ring face is plane, and outer ring face is contacted with step in the set of plunger bushing (3), realizes rigidity
Sealing.
2. the constant pressure delivery valve structure of reliable high pressure sealing as described in claim 1, which is characterized in that the cone in the inner ring face
Angle is 6 °~8 °.
3. the constant pressure delivery valve structure of reliable high pressure sealing as claimed in claim 2, which is characterized in that the width in the outer ring face
It spends for 0.9mm-1.2mm.
4. the constant pressure delivery valve structure of reliable high pressure sealing as claimed in claim 2, which is characterized in that the cone in the inner ring face
Angle is 8 °.
5. the constant pressure delivery valve structure of reliable high pressure sealing as claimed in claim 3, which is characterized in that the width in the outer ring face
It spends for 1mm.
6. the constant pressure delivery valve structure of reliable high pressure sealing as claimed in claim 3, which is characterized in that described to press hollow spiral shell
The material of bolt is 40Cr.
7. the constant pressure delivery valve structure of reliable high pressure sealing as claimed in claim 6, which is characterized in that described to press hollow spiral shell
Bolt carries out 500 DEG C of -600 DEG C of high temperings after quenching by modifier treatment.
8. the constant pressure delivery valve structure of reliable high pressure sealing as claimed in claim 7, which is characterized in that described to press hollow spiral shell
It is connected through a screw thread between bolt (1) and plunger bushing (3).
9. the constant pressure delivery valve structure of reliable high pressure sealing as claimed in claim 8, which is characterized in that the plunger bushing (3)
Mounted on when pressing on hollow bolt (1), screw-down torque 150N.m-180N.m.
10. the constant pressure delivery valve structure of reliable high pressure sealing as claimed in claim 9, which is characterized in that described to further include：Method
Blue disk (2), mounted on pressing in the middle part of hollow bolt (1), with pressing hollow bolt (1) interference fit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711261811.7A CN108167100A (en) | 2017-12-04 | 2017-12-04 | A kind of constant pressure delivery valve structure of reliable high pressure sealing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711261811.7A CN108167100A (en) | 2017-12-04 | 2017-12-04 | A kind of constant pressure delivery valve structure of reliable high pressure sealing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108167100A true CN108167100A (en) | 2018-06-15 |
Family
ID=62524309
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711261811.7A Pending CN108167100A (en) | 2017-12-04 | 2017-12-04 | A kind of constant pressure delivery valve structure of reliable high pressure sealing |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108167100A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113790109A (en) * | 2021-09-08 | 2021-12-14 | 西安航天动力研究所 | Support plate injector connecting and sealing structure suitable for composite engine |
| CN113953784A (en) * | 2021-11-13 | 2022-01-21 | 中国航发沈阳黎明航空发动机有限责任公司 | Pressure permeation detection method for cavity structure part |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62276260A (en) * | 1986-05-23 | 1987-12-01 | Nippon Denso Co Ltd | Fuel injecting device for internal combustion engine |
| KR20060117567A (en) * | 2005-05-11 | 2006-11-17 | 현대중공업 주식회사 | The delivery valve with back pressure function of fuel injection pump for diesel engine |
| CN101506515A (en) * | 2006-07-28 | 2009-08-12 | 卡特彼勒公司 | Multi-stage relief valve having different opening pressures |
| CN203296995U (en) * | 2013-04-12 | 2013-11-20 | 南岳电控(衡阳)工业技术有限公司 | Safe overflow valve device capable of controlling pressure and flux rate |
| CN206513487U (en) * | 2017-01-06 | 2017-09-22 | 罗伯特·博世有限公司 | High-pressure plunger pump and its high potential assembly, inlet valve |
-
2017
- 2017-12-04 CN CN201711261811.7A patent/CN108167100A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62276260A (en) * | 1986-05-23 | 1987-12-01 | Nippon Denso Co Ltd | Fuel injecting device for internal combustion engine |
| KR20060117567A (en) * | 2005-05-11 | 2006-11-17 | 현대중공업 주식회사 | The delivery valve with back pressure function of fuel injection pump for diesel engine |
| CN101506515A (en) * | 2006-07-28 | 2009-08-12 | 卡特彼勒公司 | Multi-stage relief valve having different opening pressures |
| CN203296995U (en) * | 2013-04-12 | 2013-11-20 | 南岳电控(衡阳)工业技术有限公司 | Safe overflow valve device capable of controlling pressure and flux rate |
| CN206513487U (en) * | 2017-01-06 | 2017-09-22 | 罗伯特·博世有限公司 | High-pressure plunger pump and its high potential assembly, inlet valve |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113790109A (en) * | 2021-09-08 | 2021-12-14 | 西安航天动力研究所 | Support plate injector connecting and sealing structure suitable for composite engine |
| CN113790109B (en) * | 2021-09-08 | 2022-11-18 | 西安航天动力研究所 | Support plate injector connecting and sealing structure suitable for composite engine |
| CN113953784A (en) * | 2021-11-13 | 2022-01-21 | 中国航发沈阳黎明航空发动机有限责任公司 | Pressure permeation detection method for cavity structure part |
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| PB01 | Publication | ||
| PB01 | Publication | ||
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20180615 |