CN210178501U - Guide cone oil outlet valve core of high-pressure common rail oil pump - Google Patents
Guide cone oil outlet valve core of high-pressure common rail oil pump Download PDFInfo
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- CN210178501U CN210178501U CN201920354350.6U CN201920354350U CN210178501U CN 210178501 U CN210178501 U CN 210178501U CN 201920354350 U CN201920354350 U CN 201920354350U CN 210178501 U CN210178501 U CN 210178501U
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Abstract
A guide cone oil outlet valve core of a high-pressure common rail oil pump comprises an upper cylinder, a seal cone, a guide post and a spring seat hole, wherein the seal cone is arranged between the upper cylinder and the guide post, a seal cone surface is arranged on the seal cone, an axial oil inlet groove is arranged on the guide post along an axis, the spring seat hole is arranged at the central position of the guide post, the aperture of the spring seat hole is equivalent to the outer diameter of a lower spring, the upper cylinder is sleeved in an inner hole of the upper spring, and the seal cone surface of the seal cone is in seal fit with the seal cone hole surface at the upper port of a valve seat; the integrated valve seat is matched with the integrated valve seat and the steel ball, so that the reliability and stability of oil inlet and outlet control can be improved, leakage is avoided, the processing and the assembly are facilitated, the qualified rate of finished products is high, and the service life is long.
Description
The technical field is as follows:
the patent of the utility model relates to a diesel engine is with automatically controlled formula fuel injection system that altogether tracks, especially relates to high pressure common rail injection pump.
Background art:
along with the implementation of the high-standard emission requirement of the diesel engine, the rail pressure requirement of a high-pressure common rail system is improved, in order to meet the requirement of the oil supply efficiency of a high-pressure rail pump, the product has the characteristics of high sealing performance, high oil inlet speed, high oil outlet pressure, high reaction speed, long service life, high reliability and the like, and meanwhile, the low processing and assembling cost and the high one-time assembling qualification rate of a finished product are ensured. In the prior art, an oil pumping component of a common rail oil injection pump is shown in fig. 1, a control component of the common rail oil injection pump adopts a split type oil inlet and outlet valve structure, the split type structure has poor sealing performance and low reliability, oil inlet and oil outlet are sealed by steel balls, an actual sealing surface between the steel ball and a corresponding sealing hole seat surface is not fixed in actual work, especially a high-pressure oil outlet control steel ball, impact can be continuously generated between the steel ball and the sealing hole seat surface, an original sealing pair is damaged, the sealing precision is difficult to stably ensure, the requirement on the processing precision of a split assembly structure is high, the processing efficiency is low, the assembly is difficult, and the high-pressure leakage risk is high.
The utility model has the following contents:
an object of the utility model is to provide a direction cone case of producing oil of high pressure common rail oil pump, its simple structure, low, the production efficiency of processing cost with the business turn over oil control valve that business turn over oil valve seat cooperation is constituteed, can stop the leakage, improves sealing performance's reliability and stability, can improve the pump oil pressure, fuel feeding efficiency and the life of injection pump.
The utility model adopts the following technical scheme:
a guide cone oil outlet valve core of a high-pressure common rail oil pump is characterized in that: the sealing cone is arranged between the upper cylinder and the guide column, a sealing cone face is arranged on the sealing cone, an axial oil inlet groove is axially formed in the guide column, the spring seat hole is arranged in the center of the guide column, the aperture of the spring seat hole is equivalent to the outer diameter of a lower spring, the upper cylinder is sleeved in an inner hole of the upper spring, and the sealing cone face of the sealing cone is in sealing fit with the sealing cone hole face of an upper port of a valve seat.
Furthermore, a central oil outlet hole is formed in the center of the upper cylinder, a transverse oil outlet hole is formed in the outer circle side face of the joint of the upper cylinder and the sealing cone, and the transverse oil outlet hole is communicated with the central oil outlet hole.
Furthermore, the transverse oil outlet holes are circumferentially arranged on the outer circle side surface of the upper cylinder at intervals.
Furthermore, the number of the transverse oil outlet holes is 2-8.
Furthermore, the number of the transverse oil outlet holes is 3-4.
Furthermore, more than 2 axial oil inlet grooves are formed in the guide post at intervals along the circumferential direction.
Furthermore, the number of the axial oil inlet grooves is 2-8.
Furthermore, the number of the axial oil inlet grooves is 3-4.
The beneficial effects of the utility model
The utility model discloses a technical scheme adopt spherical seal structure at the oil feed position, adopt conical surface seal structure at the position of producing oil, and with current structure contrast, have following advantage:
firstly, because the existing valve seat is of a split structure, the machining precision requirement is high, the yield is low, the machining cost is high, leakage can be generated between joint surfaces, and the limit pressure requirement of a high-pressure pump can not be met;
secondly, the oil inlet and outlet of the existing oil pump are opened and closed by steel balls, and the low-pressure oil outlet and the high-pressure oil outlet are sealed by steel balls, the utility model discloses 4 adopts the steel ball bearing to bear large pressure, only uses the upper spring 3 to carry out limit reset reliability poor, and will leak once the pressure is biased, and the roundness of the contact line between the steel ball and the sealing cone surface, the deformation after high-pressure impact, and the repeated guiding orientation of the ball valve structure is poor, and the above factors can directly cause the sealing performance to be poor, and the utility model adopts the steel ball sealing structure at the low-pressure oil inlet, but adds the anti-rotation support of the steel ball to prevent the steel ball from rotating in work, improves the stability of the sealing pair, the oil outlet adopts the cone guiding sealing structure, the sealing pair is a cone grinding sealing pair, under the working condition of high-pressure frequent impact, the sealing performance is more reliable, the sealing reliability is improved, therefore, the sealing performance of the whole structure is greatly enhanced, and the oil pumping efficiency of the common rail oil injection pump is effectively improved.
Third, current split type structure, because the spring can't effectively be fixed during the installation, be difficult to once only take a seat to the steel ball on, the assembly is more difficult, time-consuming, and this scheme because simple structure, with steel ball, spring, case put into the disk seat in proper order can, the installation is comparatively simple and convenient, has effectively shortened the assemble duration.
Description of the drawings:
FIG. 1 is a schematic diagram of a prior art fuel injection pump;
FIG. 2 is a schematic structural view of an injection pump according to the present invention;
FIG. 3 is a schematic structural view of an oil inlet/outlet control valve according to the present invention;
FIG. 4 is a schematic structural view of the present invention;
FIG. 5 is a cross-sectional view taken along line A-A of FIG. 4;
FIG. 6 is a schematic view of the valve seat;
in the figure: 1-oil pipe joint; 2-sealing ring; 3-spring up; 4-the utility model; 5-lower spring; 6-steel ball; 7-valve seat; 8-a plunger; 9-a valve body; 10-a high-pressure oil outlet channel; 11-a high pressure oil chamber; 12-an annular oil chamber; 13-plunger high pressure chamber; 41-upper column; 42-sealing the cone; 43-a guide post; 44-spring seat bore; 45-sealing the cone surface; 46-axial oil inlet groove; 47-center oil outlet; 48-transverse oil outlet holes; 51-anti-rolling support; 71-transverse oil inlet holes; 72-central oil inlet hole; 73-oil storage cavity; 74-a pilot hole; 75-sealing the cone face; 76-vertical oil inlet holes; 77-a headspace oil cavity; 78-steel ball sealing face; 79-lower journal; 91-valve body oil inlet hole; 92-oil return passage.
The specific implementation mode is as follows:
the following description of the embodiments of the present invention will be made with reference to the accompanying drawings:
example 1: the utility model provides an adopt the utility model discloses a common rail high-pressure oil pump, as shown in fig. 2-6, including oil pipe joint 1, sealing washer 2, go up spring 3 the utility model discloses 4, lower spring 5, steel ball 6, disk seat 7, plunger 8 and valve body 9, characterized by: the utility model discloses 4 by last cylinder 41, sealed cone 42, guide post 43 and spring seat hole 44 are constituteed, sealed cone 42 sets up between last cylinder 41 and guide post 43, be equipped with sealed cone face 45 on sealed cone 42, be equipped with axial oil feed tank 46 on guide post 43, spring seat hole 44 sets up the central point at guide post 43 and puts, the aperture of spring seat hole 44 is equivalent with the external diameter of lower spring 5, go up cylinder 41 suit in the hole of last spring 3, be equipped with central oil outlet 47 at the center of last cylinder 41, be equipped with horizontal oil outlet 48 on the excircle side of the junction of last cylinder 41 and sealed cone 42, horizontal oil outlet 48 communicates with each other with central oil outlet 47;
the sealing cone surface 45 of the sealing cone 42 is in sealing fit with the sealing cone hole surface 75 of the upper port of the valve seat 7; the valve seat 7 is of an integral structure and comprises a transverse oil inlet hole 71, a central oil inlet hole 72, an oil storage cavity 73, a guide hole 74, a sealing taper hole surface 75, a vertical oil inlet hole 76, a top clearance oil cavity 77 and a steel ball sealing surface 78, wherein the central oil inlet hole 72, the oil storage cavity 73, the guide hole 74 and the sealing taper surface 75 are coaxially arranged, the sealing taper hole surface 75 is arranged at the upper opening end of the guide hole 74, the oil storage cavity 73 and the central oil inlet hole 72 are sequentially arranged from top to bottom, the transverse oil inlet hole 71 is communicated with the central oil inlet hole 72, the vertical oil inlet hole 76 is arranged between the oil storage cavity 73 and the top clearance oil cavity 77, and the oil storage cavity 73 is communicated with the top clearance oil cavity 77 through the vertical oil inlet hole 76; the connection relationship among all parts is as follows: the oil pipe joint 1 is arranged at the upper end of the valve body 9, a sealing ring 2 is arranged between the oil pipe joint 1 and the valve body 9, a valve seat 7 is arranged in the upper cavity of the valve body 9, the utility model discloses 4 is arranged between the valve seat 7 and the oil pipe joint 1, a spring 3 is arranged between the utility model discloses 4 and the oil pipe joint 1, a lower spring 5 and an anti-rotation support 51 are arranged between the utility model discloses 4 and a steel ball 6, the anti-rotation support 51 is arranged between the steel ball 6 and the lower spring 5, the lower spring 5 is arranged in a spring seat hole 44, the positioning support surface of the anti-rotation support 51 is contacted with the steel ball 6, the steel ball 6 is seated on the steel ball sealing surface 78 at the upper port of the central oil inlet 72 of the valve seat 7 under the pressing and holding of the anti-rotation support 51, a plunger 8 capable of moving up and down is arranged in the lower central hole of the valve body 9, a high-pressure oil outlet passage 10 is arranged at the center of the oil pipe joint 1, the utility model discloses a sealed cone 42 contacts with sealed taper hole face 75, the guide post 43 suit is in guiding hole 74, form annular oil pocket 12 between the lower axle journal 79 excircle of disk seat 7 and valve body 9, annular oil pocket 12 communicates with each other with central inlet port 72 through horizontal inlet port 71, set up the valve body inlet port 91 of intercommunication annular oil pocket 12 on valve body 9, at plunger 8, form plunger high pressure chamber 13 between disk seat 7 and the valve body 9, set up the vertical inlet port 76 that the intercommunication deposited oil pocket 73 and plunger high pressure chamber 13 in disk seat 7, set up return oil passageway 92 in the lower part of valve body 9.
In this example, three lateral oil outlet holes 48 are provided on the outer circumferential side surface of the upper cylinder 41 at intervals in the circumferential direction. Three axial oil inlet grooves 46 are circumferentially provided at intervals on the guide post 43.
The working process of the utility model is as follows:
an oil inlet process: the plunger 8 descends, negative pressure is generated in the plunger high-pressure cavity 13, the vertical oil inlet hole 76 and the oil storage cavity 73, the pressure of the oil storage cavity 73 is lower than that of the central oil inlet hole 72, fuel enters the central oil inlet hole 72 through the valve body oil inlet channel 91 and the transverse oil inlet hole 71, then the pretightening force of the lower spring 5 is overcome, the steel ball 6 is pushed to move upwards to be opened, and the fuel flows into the plunger high-pressure cavity 13 from the central oil inlet hole 72 through the oil storage cavity 73 and the vertical oil inlet hole 76; at this stage, the high-pressure oil outlet passage 10 above the utility model 4 is connected with the high-pressure oil pipe, and the high-pressure oil stored in the high-pressure oil pipe and the resultant force generated by the upper spring 3 force the utility model 4 to be in a closed state; when the plunger 8 moves to the bottom dead center, the pressure difference between the central oil inlet 72 and the oil storage cavity 73 gradually disappears, the steel ball 6 is seated on the sealing surface under the action of the lower spring 5, the oil inlet path is closed, and the whole oil inlet process is finished.
Oil pressing process: the plunger 8 goes upward, and plunger high pressure chamber 13, vertical inlet port 76 and the interior oil pressure of trapped oil chamber 73 increase, produce reverse pressure difference between trapped oil chamber 73 and the annular oil chamber 12, and the pressure is higher than the pressure in the annular oil chamber 12 in trapped oil chamber 73 promptly, forces steel ball 6 to close more thoroughly on the one hand, and on the other hand, high-pressure fuel directly promotes through trapped oil chamber 73, guiding hole 74 the utility model discloses 4 moves up, makes sealed cone face 45 leave sealed cone face 75, and high-pressure fuel passes through high pressure oil chamber 11 from guiding hole 74, then gets into central oil outlet 47 and the blowout of high-pressure oil outlet passageway 10 from horizontal oil outlet 48, realizes high-pressure fuel feeding, and when pushing up extremely spacing on plunger 8, the fuel feeding is ended, begins the next oil feed process of circulation.
The utility model discloses an embodiment is many, does not list one by one here, as long as take the utility model discloses a scheme of waiting function to replace all belongs to the utility model discloses a protection scope.
Claims (6)
1. A guide cone oil outlet valve core of a high-pressure common rail oil pump is characterized in that: comprises an upper cylinder (41), a sealing cone (42), a guide post (43) and a spring seat hole (44), wherein the sealing cone (42) is arranged between the upper cylinder (41) and the guide post (43), a sealing cone surface (45) is arranged on the sealing cone (42), an axial oil inlet groove (46) is axially arranged on the guide post (43), the spring seat hole (44) is arranged at the central position of the guide post (43), the aperture of the spring seat hole (44) is equivalent to the outer diameter of a lower spring (5), the upper cylinder (41) is sleeved in an inner hole of an upper spring (3), a central oil outlet hole (47) is arranged at the center of the upper cylinder (41), a transverse oil outlet hole (48) is arranged on the outer circle side surface of the joint of the upper cylinder (41) and the sealing cone (42), the transverse oil outlet hole (48) is communicated with the central oil outlet hole (47), and the transverse oil outlet holes (48) are circumferentially arranged on the outer circle side surface of the upper cylinder (41) at intervals, and a sealing cone surface (45) of the sealing cone (42) is in sealing fit with a sealing cone hole surface (75) of the upper port of the valve seat (7).
2. The pilot cone oil outlet spool of the high pressure common rail oil pump as set forth in claim 1, wherein: the number of the transverse oil outlet holes (48) is 2-8.
3. The pilot cone oil outlet spool of the high pressure common rail oil pump as set forth in claim 2, wherein: the number of the transverse oil outlet holes (48) is 3-4.
4. The pilot cone oil outlet spool of the high pressure common rail oil pump as set forth in claim 1, wherein: more than 2 axial oil inlet grooves (46) are arranged on the guide post (43) at intervals along the circumferential direction.
5. The pilot cone oil outlet spool of the high pressure common rail oil pump as set forth in claim 4, wherein: the number of the axial oil inlet grooves (46) is 2-8.
6. The pilot cone oil outlet spool of the high pressure common rail oil pump as set forth in claim 5, wherein: the number of the axial oil inlet grooves (46) is 3-4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920354350.6U CN210178501U (en) | 2019-03-19 | 2019-03-19 | Guide cone oil outlet valve core of high-pressure common rail oil pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920354350.6U CN210178501U (en) | 2019-03-19 | 2019-03-19 | Guide cone oil outlet valve core of high-pressure common rail oil pump |
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| Publication Number | Publication Date |
|---|---|
| CN210178501U true CN210178501U (en) | 2020-03-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920354350.6U Active CN210178501U (en) | 2019-03-19 | 2019-03-19 | Guide cone oil outlet valve core of high-pressure common rail oil pump |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113123908A (en) * | 2021-05-24 | 2021-07-16 | 中国重汽集团重庆燃油喷射系统有限公司 | Oil inlet and outlet control mechanism for high-pressure common rail system |
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2019
- 2019-03-19 CN CN201920354350.6U patent/CN210178501U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113123908A (en) * | 2021-05-24 | 2021-07-16 | 中国重汽集团重庆燃油喷射系统有限公司 | Oil inlet and outlet control mechanism for high-pressure common rail system |
| CN113123908B (en) * | 2021-05-24 | 2023-12-26 | 重油高科电控燃油喷射系统有限公司 | Oil inlet and outlet control mechanism for high-pressure common rail system |
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