CN104314724A - High-pressure common rail pump high reliability and long service life single-way check valve - Google Patents
High-pressure common rail pump high reliability and long service life single-way check valve Download PDFInfo
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- CN104314724A CN104314724A CN201410539845.8A CN201410539845A CN104314724A CN 104314724 A CN104314724 A CN 104314724A CN 201410539845 A CN201410539845 A CN 201410539845A CN 104314724 A CN104314724 A CN 104314724A
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Abstract
The invention provides a high-pressure common rail pump high reliability and long service life single-way check valve which comprises an oil outlet hole, a spring base, a returning spring and a sealing ball, wherein a sliding guiding sleeve is additionally arranged between the returning spring and the sealing ball, the right end surface of the sliding guiding sleeve is provided with a ball body supporting surface, a reset oil hole in the bottom of the ball body supporting surface is communicated with a spring limit hole, a side surface oil inlet channel is arranged on the cone surface of a cone segment, the side surface oil inlet channel is communicated with the spring limit hole, and the sealing ball, the sliding guiding sleeve, the returning spring and the spring base are sequentially arranged inside the oil outlet hole. The sealing ball is in sealing contact with a sealing cone surface under the centering supporting of the ball body supporting surface under the effect of the returning spring, and an opening and closing distance of the check valve is axially formed between the sliding guiding sleeve and the spring base. The sealing ball is supported by the ball body supporting surface in the moving process in a centering mode, the sealing ball can guide and cannot be damaged, the sealing belt formed between the sealing ball and the sealing cone surface is stable and reliable, the flowing back of high pressure oil can be prevented, and the high-pressure oil supply performance and the service life of a common rail pump are improved.
Description
Technical field:
The present invention relates to a kind of hydraulic element in hydraulic system, particularly relate to the hydraulic back-pressure valve in diesel engine high-pressure co-rail system common rail pump assembly.
Background technique:
Along with the progress of society and the enhancing of environmental consciousness, people require more and more higher to the energy-saving and emission-reduction of diesel engine, at present, Europe IV emission standard implemented by China's diesel engine, and the mechanically controlled type fuel injection system that China originally generally used can not meet above-mentioned requirements; According to the designing requirement of diesel engine high-pressure co-rail fuel injection supply system, the jet pressure of fuel oil must at more than 160Mpa, pass through common-rail injector, regularly, quantitatively diesel engine respective combustion chamber is accurately injected into, thus ensure all to reach in diesel engine every cylinder the air fuel ratio of good atomization, best firing time and the best, to guarantee fuel oil Thorough combustion, maximizedly to release energy and minimum discharging pollutants.Common-rail fuel injection technology contributes to the exhaust emissions amount reducing diesel engine, and improve the combination property of the aspect such as noise, fuel consume, its environmental-protecting performance and power performance are all very good, will promote diesel engine industry, automotive industry and associated industrial expansion.
High voltage common rail pump is the supplier of pressure oil in high-pressure common rail fuel injection supply system, it needs to require accurately in common rail pipe, to supply high pressure fuel according to diesel engine, existing high voltage common rail pump is as Fig. 1, shown in Fig. 2, it comprises the pump housing 1, end cap 2, camshaft 3, plunger 4, plunger bushing 5, piston spring 6, tappet body 7, oiling valve 8 and safety check 9, the left end of camshaft 3 by sliding supported condition in the pump housing 1, the right-hand member of camshaft 3 by sliding supported condition on end cap 2, the upper end of plunger 4 is sleeved in the mesopore of plunger bushing 5, the lower end of plunger 4 is sleeved on by spring lower seat 10 in the endoporus of tappet body 7, tappet body 7 is sleeved in the valve seat orifice of the pump housing 1, the lower end of tappet body 7 is contacted by the cylindrical of slide block 11 with the driving ring 12 on the eccentric wheel being arranged on camshaft 3, plunger bushing 5 to be coordinated with the valve seat orifice of the pump housing 1 by positioning step locates and is fixedly mounted on the pump housing 1, oil inlet hole 13 on the pump housing 1 communicates with the oblique oil inlet hole 14 of plunger bushing 5, piston spring 6 is arranged between plunger bushing 5 and spring lower seat 10, oiling valve 8 is provided with in the upper end of the mesopore of plunger bushing 5, the oil inlet end of safety check 9 and the side of mesopore interlink, its working principle is: camshaft 3 constantly rotates under the crank-driven of diesel engine, plunger 4 constantly slides up and down under the effect of piston spring 6 and camshaft 3, thus the pressure size changed in the oil pocket on plunger 4 top, when plunger 4 moves down, the oil pocket internal pressure on plunger 4 top reduces, oil pocket is moved up under primary pressure oil oppresses the spool of oiling valve 8 from the oblique oil inlet hole 14 plunger bushing 5, when plunger 4 rises, the spool of oiling valve 8 moves closedown, oil pressure in oil pocket constantly raises, when pressure increase is to predetermined value, safety check 9 is opened, high pressure oil is pressed in common rail pipe, then closure of check ring, circulation like this, constantly high pressure oil is provided by common rail pump in common rail pipe.
It can thus be appreciated that, high voltage common rail pump is the important component part of common rail system, be equivalent to the function of human body cardiac, its function is for whole common rail system provides enough high pressure fuels, the high-pressure oil feed Performance And Reliability of high voltage common rail pump is most important, and wherein the unidirectional fuel-displaced reverse sealability of safety check and reliability are the keys ensureing high voltage common rail pump performance and used life; Therefore, the world is constantly improving safety check each large supply commercial city, attempts reliability and the working life of improving safety check.Due to the rigors to high voltage common rail pump oil supply performance and reliability, thus require high to the sealing reliability of safety check, what require safety check can be formed at fuel feeding closes oil circuit rapidly finally, must not rebound, in order to avoid cause the high pressure oil in common rail pipe to reflux; Require that safety check must have permanent working life simultaneously.
In conventional high-tension common rail pump, conventional safety check is ball valve sealing structure, the structure of this safety check as shown in Figure 3, it comprises the oil outlet 51 on plunger bushing 5, spring seat 91, return spring 92 and ball sealer 93, spring seat 91, return spring 92 and ball sealer 93 are installed in oil outlet 51, sealing cone 52 and oil-feed aperture 53 is provided with on the top of oil outlet 51, return spring 92 is arranged between spring seat 91 and ball sealer 93, ball sealer 93 seals with sealing cone 52 and contacts, safety check acts on ball sealer 93 by return spring 92 to realize constant pressure turn on, release is closed automatically, it is in fact an one-way valve, there is following a few point defect in actual use in this structure:
First, ball sealer 93 does not lead in setback stroke, owing to there is reasons such as bending, tremble after return spring 92 pressurized, make the first make contact of ball sealer 93 and sealing cone 52 not on seal band, between ball sealer 93 and sealing cone 52, the short time forms space, cause the high pressure fuel transient backflow in common rail pipe, make common rail pump for shortage of oil.
The second, ball sealer 93 high frequency irregularly clashes into sealing cone 52 for a long time both can destroy sealing cone 52, also can destroy the sealing surfaces of ball sealer 93, thus cause seal failure;
3rd, the stroke of ball sealer 93 does not have mechanical constraint, may occur the compression doubling-up of return spring 92, fracture, causes ball sealer 93 to reset and to fit with sealing cone 52, cause seal failure;
4th, end face due to return spring 92 needs through grinding, sharp edge and cutting edge is all there is at the head of return spring 92 two ends steel wire, ball sealer 93 constantly and return spring 92 two ends sharp edge and edge contacts, can scratch or the surface of cutting sealing ball 93, cause cut or groove at ball sealer 93 sealing surfaces, thus cause seal failure.
Summary of the invention:
The object of this invention is to provide a kind of high voltage common rail pump high reliability long life one way stop peturn valve, overcome the above-mentioned defect that in existing common rail pump, safety check exists.
The technological scheme that the present invention takes is as follows:
A kind of high voltage common rail pump high reliability long life one way stop peturn valve, comprise the oil outlet on plunger bushing, spring seat, return spring and ball sealer, sealing cone and oil-feed aperture is provided with on the top of oil outlet, it is characterized in that: also comprise slippage guide sleeve, the sleeve-like structure of step hole is provided with centered by described slippage guide sleeve, left section is guiding cylinder, right section for opening and closing section, be spring retainer hole at the left end of slippage guide sleeve center step hole, the right side opening and closing section is provided with spheroid holding face, the axis in spheroid holding face and the dead in line of guiding cylinder, reset oilhole is provided with bottom spheroid holding face, reset oilhole and spring retainer hole interlink, keying section is provided with side oil inlet passage, side oil inlet passage and spring retainer hole interlink, described oil outlet comprises and coordinates section and slippage section, section is coordinated to be positioned at the outside of slippage section, the aperture of section is coordinated to be greater than the aperture of slippage section, axial limiting step is formed coordinating section and slippage section and junction, the axis of sealing cone and the endoporus axis collinear of slippage section, ball sealer, slippage guide sleeve, return spring and spring seat are arranged in oil outlet successively, wherein, slippage guide sleeve is sleeved in slippage section, and spheroid holding face is corresponding with sealing cone, be premise clearance fit between guiding cylinder and slippage section, slippage guide sleeve is along the free slippage of slippage section energy, ball sealer is between spheroid holding face and sealing cone, spring seat presses solidly in the cooperation section of oil outlet with tight joint formula formula, spring seat is by axial limiting step axial limiting, ball sealer to seal with sealing cone and contacts under the effect of return spring and by the holding of spheroid holding face, the keying distance of safety check is axially had between slippage guide sleeve and spring seat.
Further, side oil inlet passage is opened on the right side of keying section, and is positioned at the outside in spheroid holding face.
Further, right section that opens and closes section is path cylinder, and between guiding cylinder and path cylinder, be provided with cone segments, side oil inlet passage is opened in cone segments.
Further, the external diameter of path cylinder is less 0.5 ~ 5 millimeter than the external diameter of guiding cylinder.
Further, described side oil inlet passage is oil inlet hole or oil-feed tank.
Further, spring seat is provided with spring base hole and center hole, center hole is arranged on the left side of spring base hole, and both interlink.
Further, described spheroid holding face is sphere or the conical surface.
Further, be provided with between the slippage section and sealing cone of oil outlet and expand chamber section.
Further, the conical surface of cone segments is circumferentially evenly provided with three side oil inlet passages.
Further, the keying distance axially having safety check between slippage guide sleeve and spring seat is 0.2 ~ 2 millimeter.
Owing to having set up slippage guide sleeve between ball sealer and return spring, return spring is arranged between spring seat and slippage guide sleeve, stop the contact of ball sealer and return spring end face, ball sealer is by the coaxial spheroid holding of axis and sealing cone in the face of middle holding, and when opening fuel-displaced, ball sealer is pressed on spheroid holding face by the high pressure oil centering of plunger top, move to left with slippage guide sleeve, ball sealer and sealing cone depart from, and high pressure oil from the side oil inlet passage extrudes, and enters in common rail pipe, work as after end of injection, ball sealer is centrally pressed on fast accurate on sealing cone by the high pressure oil in common rail pipe again and closes, in keying alternation process, although ball sealer is axially having movement, but middle holding faced by spheroid holding all the time, the sphere of ball sealer only contacts with sealing cone with smooth spheroid holding face, can not be damaged, the contact sealing strip of ball sealer and sealing cone is stablized, especially in closed starting point, contact for full circle lands between ball sealer with sealing cone, instead of point lands, not only shorten closing time, and the thorough backflow phenomenon eliminating closed initial stage of energy, high pressure oil in press-in common rail pipe can not be back in common rail pump, thus ensure that effective fuel feeding of common rail pump.Because return spring only acts on slippage guide sleeve, return spring does not contact with the sphere of ball sealer, and therefore, the sealing sphere of ball sealer can not be impaired; Meanwhile, ball sealer is middle clamping faced by high pressure oil and spheroid holding all the time in advance and retreat process, namely has constant guiding, and and between sealing cone, there is not a landing shock problem, therefore, sealing cone also can not produce local lesion.Due to the keying distance being axially arranged with safety check at slippage guide sleeve and spring seat, this distance can open and close according to the best of safety check and require design, thus define the compression stroke of return spring, there will not be and cause spring doubling-up or fracture because of pressure oil overpressure, ensure that return spring works in the compressive strain stroke of design, so just can ensure sealing reliability and stability between ball sealer and sealing cone, the working life of safety check can be increased substantially, thus extend the high-pressure oil feed performance and used life of common rail pump.
Accompanying drawing illustrates:
Fig. 1 is the structural representation of existing common rail pump, and wherein safety check is ball-valve structure;
Fig. 2 is the A-A sectional view of Fig. 1;
Fig. 3 is the structural representation of existing check valve structure;
Fig. 4 is structural representation of the present invention;
Fig. 5 is the structural representation of spring seat;
Fig. 6 is the structural representation of the oil outlet on plunger bushing;
Fig. 7 is the structural representation of slippage guide sleeve in the present invention;
Fig. 8 is the another kind of structural representation of slippage guide sleeve in the present invention;
Fig. 9 is the structural representation that the present invention is arranged in common rail pump;
In figure: the 1-pump housing; 2-end cap; 3-camshaft; 4-plunger; 5-plunger bushing; 6-piston spring; 7-tappet body; 8-oiling valve; 9-safety check; 10-spring lower seat; 11-slide block; 12-driving ring; 13-oil inlet hole; The oblique oil inlet hole of 14-; 51-oil outlet; 52-sealing cone; 53-oil-feed aperture; 54-coordinates section; 55-slippage section; 56-axial limiting step; 57-expands chamber section; 91-spring seat; 92-return spring; 93-ball sealer; 94-slippage guide sleeve; 911-spring base hole; 912-center hole; 941-leads cylinder; 942-path column body segment; 943-cone segments; 945-spheroid holding face; 946-reset oilhole; 947-side oil inlet passage.
Embodiment:
The specific embodiment of the present invention is described in detail below in conjunction with accompanying drawing:
Embodiment 1: a kind of high voltage common rail pump high reliability long life one way stop peturn valve, as shown in Fig. 4 ~ Fig. 7 and Fig. 9, comprise the oil outlet 51 on plunger bushing 5, sealing cone 52, oil-feed aperture 53, spring seat 91, return spring 92, ball sealer 93 and slippage guide sleeve 94, spring seat 91 is provided with spring base hole 911 and center hole 912, the profile of described slippage guide sleeve 94 is made up of two sections of cylinders and one section of cone, left section is guiding cylinder 941, right section is path column body segment 942, cone segments 943 is arranged between guiding cylinder 941 and path column body segment 942, the diameter of path column body segment 942 is less 3 millimeters than the diameter of guiding cylinder 941, step hole is provided with at slippage guide sleeve 94 center, left end is spring retainer hole 944, the right side of path column body segment 942 is provided with spheroid holding face 945, reset oilhole 946 is provided with bottom spheroid holding face 945, reset oilhole 946 and spring retainer hole 944 interlink, the conical surface of cone segments 943 is circumferentially evenly provided with three side oil inlet passages 947, three side oil inlet passages 947 interlink with spring retainer hole 944, described spheroid holding face 945 is the conical surface, the dead in line of its axis and guiding cylinder 941, described oil outlet 51 is by cooperation section 54, slippage section 55 and expansion chamber section 57 form, section 54 is coordinated to be positioned at the outside of slippage section 55, coordinate larger than the aperture of slippage section 55 3 millimeters of the aperture of section 54, axial limiting step 56 is formed with slippage section 55 and junction in cooperation section 54, ball sealer 93, slippage guide sleeve 94, return spring 92 and spring seat 91 are arranged in oil outlet 51 successively, wherein, slippage guide sleeve 94 is sleeved in slippage section 55, and spheroid holding face 945 on path column body segment 942 right side is corresponding with sealing cone 52, the axis of slippage section 55 and the axis collinear of sealing cone 52, be premise clearance fit between guiding cylinder 941 and slippage section 55, slippage guide sleeve 94 is along the free slippage of slippage section 55 energy, ball sealer 93 is between spheroid holding face 945 and sealing cone 52, spring seat 91 presses solidly in the cooperation section 54 of oil outlet 51 with tight joint formula formula, spring seat 91 is by axial limiting step 56 axial limiting, under the acting in conjunction of the high pressure oil of ball sealer 93 in return spring 92 and common rail pipe, to be sealed with sealing cone 52 by the spheroid holding face 945 centering holding of slippage guide sleeve 94 front end and contact, the keying distance of safety check is had at slippage guide sleeve 94 and the axis of spring seat 91, the keying distance of safety check is 0.2 ~ 2 millimeter.
Embodiment 2: difference from Example 1 is, the structure of slippage guide sleeve 94, in this example, as shown in Figure 8, slippage guide sleeve 94 is the cylindrical sleeve of a front end band chamfering, and side oil inlet passage 947 is opened on the right side of slippage guide sleeve 94, and interlinks with spring retainer hole 944.
Embodiments of the present invention are a lot, do not enumerating one by one at this, and all schemes of all function replacement such as adopt this bright are all within protection scope of the present invention.
Claims (10)
1. a high voltage common rail pump high reliability long life one way stop peturn valve, comprise the oil outlet (51) on plunger bushing (5), spring seat (91), return spring (92) and ball sealer (93), sealing cone (52) and oil-feed aperture (53) is provided with on the top of oil outlet (51), it is characterized in that: also comprise slippage guide sleeve (94), the sleeve-like structure of step hole is provided with centered by described slippage guide sleeve (94), left section is guiding cylinder (941), right section for opening and closing section, be spring retainer hole (944) at the left end of slippage guide sleeve (94) center step hole, the right side opening and closing section is provided with spheroid holding face (945), the axis in spheroid holding face (945) and the dead in line of guiding cylinder (941), reset oilhole (946) is provided with in spheroid holding face (945) bottom, reset oilhole (946) and spring retainer hole (944) interlink, keying section is provided with side oil inlet passage (947), side oil inlet passage (947) and spring retainer hole (944) interlink, described oil outlet (51) comprises and coordinates section (54) and slippage section (55), section (54) is coordinated to be positioned at the outside of slippage section (55), the aperture of section (54) is coordinated to be greater than the aperture of slippage section (55), axial limiting step (56) is formed in cooperation section (54) and slippage section (55) and junction, the axis of sealing cone (52) and the endoporus axis collinear of slippage section (55), ball sealer (93), slippage guide sleeve (94), return spring (92) and spring seat (91) are arranged in oil outlet (51) successively, wherein, slippage guide sleeve (94) is sleeved in slippage section (55), and spheroid holding face (945) are corresponding with sealing cone (52), be premise clearance fit between guiding cylinder (941) and slippage section (55), slippage guide sleeve (94) is along the free slippage of slippage section (55) energy, ball sealer (93) is positioned between spheroid holding face (945) and sealing cone (52), spring seat (91) presses solidly in the cooperation section (54) of oil outlet (51) with tight joint formula formula, spring seat (91) is by axial limiting step (56) axial limiting, ball sealer (93) to seal with sealing cone (52) and contacts under the effect of return spring (92) and by spheroid holding face (945) holding, the keying distance of safety check is axially had between slippage guide sleeve (94) and spring seat (91).
2. high voltage common rail pump high reliability long life one way stop peturn valve according to claim 1, is characterized in that: side oil inlet passage (947) be opened in open and close section right side on, and be positioned at the outside of spheroid holding face (945).
3. high voltage common rail pump high reliability long life one way stop peturn valve according to claim 1, it is characterized in that: open and close right section of section for path cylinder (942), between guiding cylinder (941) and path cylinder (942), be provided with cone segments (943), side oil inlet passage (947) is opened in cone segments (943).
4. high voltage common rail pump high reliability long life one way stop peturn valve according to claim 3, is characterized in that: the external diameter of path cylinder (942) is less 0.5 ~ 5 millimeter than the external diameter of guiding cylinder (941).
5. high voltage common rail pump high reliability long life one way stop peturn valve according to claim 1 or 2 or 3, is characterized in that: described side oil inlet passage (947) is oil inlet hole or oil-feed tank.
6. high voltage common rail pump high reliability long life one way stop peturn valve according to claim 1, it is characterized in that: on spring seat (91), be provided with spring base hole (911) and center hole (912), center hole (912) is arranged on the left side of spring base hole (911), and both interlink.
7. high voltage common rail pump high reliability long life one way stop peturn valve according to claim 1, is characterized in that: described spheroid holding face (945) is sphere or the conical surface.
8. high voltage common rail pump high reliability long life one way stop peturn valve according to claim 1, is characterized in that: be provided with between the slippage section (55) and sealing cone (52) of oil outlet (51) and expand chamber section (57).
9. high voltage common rail pump high reliability long life one way stop peturn valve according to claim 3, is characterized in that: on the conical surface of cone segments (943), be circumferentially evenly provided with three side oil inlet passages (947).
10. high voltage common rail pump high reliability long life one way stop peturn valve according to claim 1, is characterized in that: the keying distance axially having safety check between slippage guide sleeve (94) and spring seat (91) is 0.2 ~ 2 millimeter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410539845.8A CN104314724A (en) | 2014-10-13 | 2014-10-13 | High-pressure common rail pump high reliability and long service life single-way check valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410539845.8A CN104314724A (en) | 2014-10-13 | 2014-10-13 | High-pressure common rail pump high reliability and long service life single-way check valve |
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| CN104314724A true CN104314724A (en) | 2015-01-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410539845.8A Pending CN104314724A (en) | 2014-10-13 | 2014-10-13 | High-pressure common rail pump high reliability and long service life single-way check valve |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104976389A (en) * | 2015-07-08 | 2015-10-14 | 潘明尧 | Hard sealing ultralow temperature ball check valve |
| CN106523229A (en) * | 2016-12-14 | 2017-03-22 | 中国第汽车股份有限公司 | Fuel pump valve element |
| CN108730087A (en) * | 2017-04-24 | 2018-11-02 | 卡特彼勒公司 | The liquid pump of suppression cavitation |
| CN110159470A (en) * | 2019-05-31 | 2019-08-23 | 南京威孚金宁有限公司 | A kind of VE dispensing pump damping delivery valve and application method |
| CN111794887A (en) * | 2019-04-08 | 2020-10-20 | 纬湃汽车电子(长春)有限公司 | High pressure pump |
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| DE102010061783A1 (en) * | 2010-11-23 | 2012-05-24 | Robert Bosch Gmbh | Exhaust valve i.e. return valve, for common-rail-high pressure pump utilized in common-rail-fuel injection system, has valve element comprising casing and ball that is connected with casing in fixed manner and guided indirectly over casing |
| CN204152701U (en) * | 2014-10-13 | 2015-02-11 | 常州博瑞油泵油嘴有限公司 | A kind of high voltage common rail pump high reliability long life one way stop peturn valve |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104976389A (en) * | 2015-07-08 | 2015-10-14 | 潘明尧 | Hard sealing ultralow temperature ball check valve |
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| CN108730087A (en) * | 2017-04-24 | 2018-11-02 | 卡特彼勒公司 | The liquid pump of suppression cavitation |
| CN111794887A (en) * | 2019-04-08 | 2020-10-20 | 纬湃汽车电子(长春)有限公司 | High pressure pump |
| CN111794887B (en) * | 2019-04-08 | 2022-04-12 | 纬湃汽车电子(长春)有限公司 | High pressure pump |
| CN110159470A (en) * | 2019-05-31 | 2019-08-23 | 南京威孚金宁有限公司 | A kind of VE dispensing pump damping delivery valve and application method |
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Application publication date: 20150128 |
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