CN109751165A - A kind of disengaging oil opening and closing valve of high-pressure common-rail oil pump - Google Patents
A kind of disengaging oil opening and closing valve of high-pressure common-rail oil pump Download PDFInfo
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- CN109751165A CN109751165A CN201910209267.4A CN201910209267A CN109751165A CN 109751165 A CN109751165 A CN 109751165A CN 201910209267 A CN201910209267 A CN 201910209267A CN 109751165 A CN109751165 A CN 109751165A
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Abstract
A kind of disengaging oil opening and closing valve of high-pressure common-rail oil pump, including upper valve core, lower spring, bottom spool and valve seat, upper valve core are made of column body, sealed taper, guide post and spring base hole, the upper port conical surface seal cooperation of sealed taper and valve seat；The valve seat includes lateral fuel feed hole, center fuel feed hole, trapped fuel chamber, center oil outlet, sealing cone and vertical fuel feed hole, the upper open end of the centrally disposed oil outlet of sealing cone, lateral fuel feed hole is communicated with center fuel feed hole, and vertical fuel feed hole is arranged between trapped fuel chamber and bottom clearance oil pocket；Oil inlet can prevent to leak using fixed ball ball face sealing structure, fuel-displaced position using guiding conical surface sealing structure, integrally-built valve seat, and easy to process and assembly, and finished product qualification rate is high, long service life.
Description
Technical field:
The invention patent relates to use for diesel engine electric-control common-rail type injection system more particularly to high pressure shared-rail oil jetting pumps.
Background technique:
With the implementation of diesel engine high standard emission request, the rail pressure of high pressure co-rail system requires also to increase accordingly, in order to
Meet the fuel feeding efficiency requirements of high rail pressure pump, the leakproofness of product must have extremely high requirement, and oil inlet is fast, out oil pressure
The features such as height, reaction speed is fast, long service life, high reliablity, while being ensured that processing, assembly cost are low, the one of finished product
Secondary assembly qualified rate is high.In existing technology, the pump oil component of shared-rail oil jetting pump is as shown in Figure 1, the use point of its control unit
Body formula is into and out of oil valve structure, and there are poor sealing performances for this separate structure, and reliability is low, and oil inlet is fuel-displaced that be all made of steel ball close
Envelope, the practical sealing surface between steel ball and corresponding sealing hole seat surface is not fixed in actual operation, the especially fuel-displaced control of high pressure
Steel ball processed can constantly generate impact between steel ball and sealing hole seat surface, so that original sealing pair destroys, sealed precision is difficult to surely
It is fixed to guarantee, in addition the requirement on machining accuracy of separable assembled structure is high, processing efficiency is low, assembly difficulty, high-pressure leakage risk height.
Summary of the invention:
The purpose of the present invention is to provide a kind of disengaging oil of high-pressure common-rail oil pump to open and close valve, its structure is simple, is processed into
This low, production efficiency, can prevent to leak, improve the reliability and stability of sealing performance, can improve injection pump pump oil pressure,
Fuel feeding efficiency and service life.
The technical solution adopted by the present invention is as follows:
A kind of disengaging oil opening and closing valve of high-pressure common-rail oil pump, it is characterized in that: including upper valve core, lower spring, steel ball and valve seat,
The upper valve core is made of column body, seal cones, guide post and spring base hole, and seal cones are arranged in column body and guide post
Between, sealed taper dignity is equipped in seal cones, along axial fuel inlet slot is axially arranged in guide post, spring base hole setting exists
The center of guide post, the aperture of spring base hole is suitable with the outer diameter of lower spring, and column body is sleeved in the inner hole of upper spring,
The sealed taper dignity of the seal cones and the sealed taper hole face of valve seat upper port seal and cooperate；The valve seat includes lateral oil inlet
Hole, center fuel feed hole, trapped fuel chamber, pilot hole, sealed taper hole face, vertical fuel feed hole, bottom clearance oil pocket and steel ball sealing face, center into
The upper open end of pilot hole is arranged in oilhole, trapped fuel chamber, pilot hole and the coaxial arrangement of sealed taper hole face, sealed taper hole face, is oriented to
Hole, trapped fuel chamber and center fuel feed hole are set gradually from top to bottom, and lateral fuel feed hole is communicated with center fuel feed hole, and vertical fuel feed hole is set
It sets between trapped fuel chamber and bottom clearance oil pocket, is communicated between trapped fuel chamber and bottom clearance oil pocket by vertical fuel feed hole；The guiding of upper valve core
Column sleeve is equipped with lower spring in valve seat pilot hole in the spring base hole of upper valve core, and anti-ask is arranged in steel ball and lower spring
Between, the anti-positioning holding face asked and steel ball contact, steel ball are located in valve seat under lower spring and the anti-pressure holding asked
On steel ball sealing face at the upper port of heart fuel feed hole, the seal cones of upper valve core are in contact with sealed taper hole face, under valve seat
Lateral fuel feed hole is communicated with center fuel feed hole.
Further, the center in column body is equipped with center oil outlet, in the junction of column body and seal cones
Outer circle side is equipped with lateral oil outlet, and lateral oil outlet is communicated with center oil outlet.
Further, lateral oil outlet is arranged in circumferentially spacedly on the outer circle side of column body.
Further, the setting quantity of lateral oil outlet is 2~8.
Further, the setting quantity of lateral oil outlet is 3~4.
Further, 2 or more axial fuel inlet slots are equipped with circumferentially spacedly in guide post.
Further, the setting quantity of axial fuel inlet slot is 2-8.
Further, the setting quantity of axial fuel inlet slot is 3~4.
Beneficial effects of the present invention
The technical solution adopted by the present invention is that ball face sealing structure is used at oil inlet position, it is close using the conical surface at fuel-displaced position
Seal structure is compared with existing structure, is had the advantage that
The first, since existing valve seat is split type structure, requirement on machining accuracy is higher, and yields is lower, is processed into
This height can generate leakage between faying face, not be able to satisfy the limiting pressure requirement of high-pressure pump, and the monoblock type knot that this programme uses
Structure can prevent to leak, and directly be processed using molding cutter, on the basis of effectively ensuring machining accuracy, be greatly saved and add
Work cost, improves production efficiency；
The second, existing oil pump oil inlet and it is fuel-displaced all using steel ball open and close, be all made of in low pressure oil outlet and high-pressure oil outlet
Steel ball sealing design, upper valve core bear pressure greatly using steel ball, and limit is only carried out with upper spring and resets poor reliability, once pressure is inclined
It will leak, and the circularity at steel ball and seal cones face contact line, the deformation after impacting with high pressure, in addition the repetition of ball-valve structure
Guide-localization is poor, and factors above can all directly result in sealing performance and be deteriorated, and the present invention program, uses in low pressure oil inlet
Steel ball sealing structure, but be additionally arranged the anti-of steel ball and ask, it prevents steel ball from rotating at work, improves the stabilization of sealing pair, it is fuel-displaced
Mouth uses cone pilot seal structure, and sealing pair is conical surface grinding-in pair, and under high pressure frequent impact operating condition, sealing performance is got over
With more reliable, the reliability of sealing is improved, therefore greatly strengthen whole using guiding conical surface sealing structure in high-pressure oil outlet
The sealing performance of body structure effectively increases the pump oil efficiency of shared-rail oil jetting pump.
Third, existing split type structure, since spring can not be fixed effectively when installation, it is difficult to disposably be seated in steel ball
On, assembly is more difficult, time-consuming, and steel ball, spring, spool are sequentially placed into valve seat by this programme since structure is simple,
It installs relatively simple, effectively shortens assembly time.
Detailed description of the invention:
Fig. 1 is the structural schematic diagram of existing injection pump；
Fig. 2 is using injection pump structural schematic diagram of the invention；
Fig. 3 is structural schematic diagram of the invention；
Fig. 4 is the structural representation of upper valve core；
Fig. 5 is A-A cross-sectional view in Fig. 4；
Fig. 6 is the structural schematic diagram of valve seat；
In figure: 1- oil connection；2- sealing ring；3- upper spring；4- upper valve core；Spring under 5-；6- steel ball；7- valve seat；8-
Plunger；The 9- pump housing；10- high pressure oil discharge passage；11- high-voltage oil cavity；12- annular oil cavity；13- plunger high pressure chest；41- column body；
42- seal cones；43- guide post；44- spring base hole；45- sealed taper dignity；46- axial fuel inlet slot；The center 47- oil outlet；
48- transverse direction oil outlet；51- is anti-to ask；71- transverse direction fuel feed hole；The center 72- fuel feed hole；73- trapped fuel chamber；74- pilot hole；75- is close
Seal taper hole face；The vertical fuel feed hole of 76-；77- bottom clearance oil pocket；78- steel ball sealing face；Axle journal under 79-；91- valve body fuel feed hole；92-
Drainback passage.
Specific embodiment:
The specific embodiment illustrated the present invention with reference to the accompanying drawing:
Embodiment 1: it is a kind of using common rail high-pressure oil pump of the invention, as shown in Fig. 2-Fig. 6, including oil connection 1, sealing
Circle 2, upper spring 3, upper valve core 4, lower spring 5, steel ball 6, valve seat 7, plunger 8 and valve body 9, it is characterized in that: the upper valve core 4 is by upper
Cylinder 41, seal cones 42, guide post 43 and spring base hole 44 form, and seal cones 42 are arranged in column body 41 and guide post 43
Between, it is equipped with sealed taper dignity 45 in seal cones 42, axial fuel inlet slot 46 is equipped in guide post 43, spring base hole 44 is set
It sets in the center of guide post 43, the aperture of spring base hole 44 is suitable with the outer diameter of lower spring 5, and column body 41 is sleeved on bullet
In the inner hole of spring 3, it is equipped with center oil outlet 47 at the center of column body 41, in the outer of column body 41 and 42 junction of seal cones
Circle side is equipped with lateral oil outlet 48, and lateral oil outlet 48 is communicated with center oil outlet 47；
The sealed taper dignity 45 of the seal cones 42 and the sealed taper hole face 75 of 7 upper port of valve seat seal and cooperate；It is described
Valve seat 7 be overall structure, including lateral fuel feed hole 71, center fuel feed hole 72, trapped fuel chamber 73, pilot hole 74, sealed taper hole face 75,
Vertical fuel feed hole 76, bottom clearance oil pocket 77 and steel ball sealing face 78, center fuel feed hole 72, trapped fuel chamber 73, pilot hole 74 and sealed taper
Hole face 75 is coaxially disposed, and sealed taper hole face 75 is arranged in the upper open end of pilot hole 74, pilot hole 74, trapped fuel chamber 73 and center into
Oilhole 72 is set gradually from top to bottom, and lateral fuel feed hole 71 is communicated with center fuel feed hole 72, and vertical fuel feed hole 76 is arranged in trapped fuel
Between chamber 73 and bottom clearance oil pocket 77, communicated between trapped fuel chamber 73 and bottom clearance oil pocket 77 by vertical fuel feed hole 76；Between each part
Connection relationship are as follows: oil connection 1 is mounted on the upper end of valve body 9, between oil connection 1 and valve body 9 be equipped with sealing ring 2,
Valve seat 7 is disposed in the upper cavity of valve body 9, upper valve core 4 is arranged between valve seat 7 and oil connection 1, in upper valve core 4 and oil
Upper spring 3 is equipped between pipe fitting 1, be equipped between upper valve core 4 and steel ball 6 lower spring 5 and it is anti-ask 51, prevent 51 settings of asking
Between steel ball 6 and lower spring 5, lower spring 5 is arranged in spring base hole 44, it is anti-ask 51 positioning holding face and steel ball 6 connect
Touching, steel ball 6 lower spring 5 and it is anti-ask 51 pressure holding under be located in valve seat 7 center fuel feed hole 72 upper port at steel ball
On sealing surface 78, it is equipped with the plunger 8 that can move up and down in the central bore of valve body 9, is equipped at the center of oil connection 1
High pressure oil discharge passage 10 has high-voltage oil cavity 11 between oil connection 1 and upper valve core 4, upper valve core 4 seal cones 42 with
Sealed taper hole face 75 is in contact, and guide post 43 is sleeved in pilot hole 74, between 79 outer circle of lower axle journal and valve body 9 of valve seat 7
Annular oil cavity 12 is formed, annular oil cavity 12 passes through lateral fuel feed hole 71 and communicates with center fuel feed hole 72, and connection is arranged on valve body 9
The valve body fuel feed hole 91 of annular oil cavity 12 forms plunger high pressure chest 13 between plunger 8, valve seat 7 and valve body 9, sets in valve seat 7
Drainback passage 92 is arranged in the lower part of valve body 9 in the vertical fuel feed hole 76 for setting connection trapped fuel chamber 73 and plunger high pressure chest 13.
In example, three lateral oil outlets 48 are arranged in circumferentially spacedly on the outer circle side of column body 41.It is being oriented to
Axial fuel inlet slot 46 there are three being set on column 43 circumferentially spacedly.
The course of work of the invention is as follows:
Oil inlet process: 8 downlink of plunger, plunger high pressure chest 13, vertical fuel feed hole 76 and trapped fuel chamber 73 are interior to generate negative pressure, trapped fuel
The pressure of chamber 73 passes through in valve body oil inlet passage 91, the lateral entrance of fuel feed hole 71 lower than the pressure in center fuel feed hole 72, fuel oil
In heart fuel feed hole 72, the pretightning force of lower spring 5 then being overcome, steel ball 6 being pushed to move up opening, fuel oil is passed through from center fuel feed hole 72 again
Trapped fuel chamber 73, vertical fuel feed hole 76 flow into plunger high pressure chest 13；In 10 He of high pressure oil discharge passage of this 4 or more stage upper valve core
High-pressure oil pipe is connected, and the resultant force that the high pressure oil and upper spring 3 deposited in high-pressure oil pipe generate forces upper valve core 4 to be in and closes shape
State；When plunger 8 moves to lower dead center, the pressure difference between center fuel feed hole 72 and trapped fuel chamber 73 fades away, and steel ball 6 is in lower bullet
Sealing surface is landed under the action of spring 5, oil inlet path is closed, and entire oil inlet process terminates.
Pressure oil process: 8 uplink of plunger, oil pressure increases in plunger high pressure chest 13, vertical fuel feed hole 76 and trapped fuel chamber 73, trapped fuel
Reverse differential pressure is generated between chamber 73 and annular oil cavity 12, i.e., pressure is higher than the pressure in annular oil cavity 12, a side in trapped fuel chamber 73
Face forces steel ball 6 more thoroughly to be closed, and on the other hand, high pressure fuel pushes directly on upper valve core 4 through trapped fuel chamber 73, pilot hole 74
It moves, sealed taper dignity 45 is made to leave sealed taper hole face 75, high pressure fuel, through high-voltage oil cavity 11, then goes out from transverse direction from pilot hole 74
Oilhole 48 enters center oil outlet 47 and high pressure oil discharge passage 10 and sprays, and realizes high-pressure oil feed, when shifting limit position on plunger 8 onto
When, fuel feeding terminates, and starts the cycle over next oil inlet process.
There are many embodiments of the present invention, do not enumerate one by one herein, as long as the butt for taking the functions such as the present invention to replace
Case belongs to protection scope of the present invention.
Claims (8)
1. a kind of disengaging oil of high-pressure common-rail oil pump opens and closes valve, it is characterized in that: including upper valve core (4), lower spring (5), steel ball (6)
With valve seat (7), the upper valve core (4) is by column body (41), seal cones (42), guide post (43) and spring base hole (44) group
At seal cones (42) are arranged between column body (41) and guide post (43), and seal cones are equipped on seal cones (42)
Face (45), along being axially arranged with axial fuel inlet slot (46) on guide post (43), spring base hole (44) is arranged in guide post (43)
Center, the aperture of spring base hole (44) is suitable with the outer diameter of lower spring (5), and column body (41) is sleeved on upper spring (3)
In inner hole, the sealed taper honorable (45) of the seal cones (42) is matched with sealed taper hole face (75) sealing of valve seat (7) upper port
It closes；The valve seat (7) includes lateral fuel feed hole (71), center fuel feed hole (72), trapped fuel chamber (73), pilot hole (74), sealed taper
Hole face (75), vertical fuel feed hole (76), bottom clearance oil pocket (77) and steel ball sealing face (78), center fuel feed hole (72), trapped fuel chamber
(73), pilot hole (74) and sealed taper hole face (75) coaxial arrangement, sealed taper hole face (75) setting are opened on pilot hole (74)
Mouth end, pilot hole (74), trapped fuel chamber (73) and center fuel feed hole (72) are set gradually from top to bottom, and lateral fuel feed hole (71) is in
Heart fuel feed hole (72) communicates, and vertical fuel feed hole (76) is arranged between trapped fuel chamber (73) and bottom clearance oil pocket (77), trapped fuel chamber (73)
It is communicated between bottom clearance oil pocket (77) by vertical fuel feed hole (76)；The guide post (43) of upper valve core (4) is sleeved on valve seat (7) and leads
To in hole (74), lower spring (5) are housed in the spring base hole (44) of upper valve core (4), it is anti-ask (51) setting steel ball (6) with
Between lower spring (5), it is anti-ask (51) positioning holding face and steel ball (6) contact, steel ball (6) is in lower spring (5) and prevents asking
(51) it is located under pressure holding on the steel ball sealing face (78) at the upper port of the center fuel feed hole (72) of valve seat (7), upper valve core
(4) seal cones (42) are in contact with sealed taper hole face (75), the lower lateral fuel feed hole (71) of valve seat (7) and center fuel feed hole
(72) it communicates.
2. the disengaging oil of high-pressure common-rail oil pump opens and closes valve according to claim 1, it is characterized in that: described in column body (41)
Center is equipped with center oil outlet (47), is equipped with laterally to go out in the outer circle side of column body (41) with the junction of seal cones (42)
Oilhole (48), lateral oil outlet (48) communicate with center oil outlet (47).
3. the disengaging oil of high-pressure common-rail oil pump opens and closes valve according to claim 2, it is characterized in that: lateral oil outlet (48) is along week
To being spaced apart and arranged on the outer circle side of column body (41).
4. the disengaging oil of high-pressure common-rail oil pump opens and closes valve according to claim 3, it is characterized in that: lateral oil outlet (48) are set
Setting quantity is 2~8.
5. the disengaging oil of high-pressure common-rail oil pump opens and closes valve according to claim 4, it is characterized in that: lateral oil outlet (48) are set
Setting quantity is 3~4.
6. the disengaging oil of high-pressure common-rail oil pump opens and closes valve according to claim 1, it is characterized in that: along week on guide post (43)
2 or more axial fuel inlet slots (46) are equipped with to compartment of terrain.
7. the disengaging oil of high-pressure common-rail oil pump opens and closes valve according to claim 6, it is characterized in that: axial fuel inlet slot (46) are set
Setting quantity is 2-8.
8. the disengaging oil of high-pressure common-rail oil pump opens and closes valve according to claim 7, it is characterized in that:: axial fuel inlet slot (46)
It is 3~4 that quantity, which is arranged,.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910209267.4A CN109751165A (en) | 2019-03-19 | 2019-03-19 | A kind of disengaging oil opening and closing valve of high-pressure common-rail oil pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910209267.4A CN109751165A (en) | 2019-03-19 | 2019-03-19 | A kind of disengaging oil opening and closing valve of high-pressure common-rail oil pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109751165A true CN109751165A (en) | 2019-05-14 |
Family
ID=66408919
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910209267.4A Pending CN109751165A (en) | 2019-03-19 | 2019-03-19 | A kind of disengaging oil opening and closing valve of high-pressure common-rail oil pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109751165A (en) |
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2019
- 2019-03-19 CN CN201910209267.4A patent/CN109751165A/en active Pending
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Legal Events
| Date | Code | Title | Description |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20190514 |