CN105408619A - Overflow valve for high pressure pump in fuel injection system - Google Patents
Overflow valve for high pressure pump in fuel injection system Download PDFInfo
- Publication number
- CN105408619A CN105408619A CN201480028140.8A CN201480028140A CN105408619A CN 105408619 A CN105408619 A CN 105408619A CN 201480028140 A CN201480028140 A CN 201480028140A CN 105408619 A CN105408619 A CN 105408619A
- Authority
- CN
- China
- Prior art keywords
- valve
- relief valve
- outlet port
- pressure
- order
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
- F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
- F02M37/0011—Constructional details; Manufacturing or assembly of elements of fuel systems; Materials therefor
- F02M37/0023—Valves in the fuel supply and return system
- F02M37/0029—Pressure regulator in the low pressure fuel system
-
- 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
-
- 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
- F02M63/00—Other fuel-injection apparatus having pertinent characteristics not provided for in groups F02M39/00 - F02M57/00 or F02M67/00; Details, component parts, or accessories of fuel-injection apparatus, not provided for in, or of interest apart from, the apparatus of groups F02M39/00 - F02M61/00 or F02M67/00; Combination of fuel pump with other devices, e.g. lubricating oil pump
- F02M63/0001—Fuel-injection apparatus with specially arranged lubricating system, e.g. by fuel oil
Abstract
The invention relates to an overflow valve for a high pressure fuel pump in a fuel injection system, in particular in a common-rail injection system, comprising a valve element (2), which is accommodated in a displaceable manner in a housing bore (1), for connecting a valve inlet (3) to at least one valve outlet (4, 5), and also a spring (7) which is accommodated in a spring space (6) and the spring force of which acts on the valve element (2) in the direction of the valve inlet (3). According to the invention, provision is made of a plurality of valve outlets (4, 5) each in the form of a bore that opens radially into the housing bore (1), said valve outlets (4, 5), in order to form a multistage overflow valve comprising at least one first stage (A) and one second stage (B), having different free flow cross-sectional areas and/or being arranged at different axial distances from the valve inlet (3). The invention also relates to a high pressure pump having such an overflow valve.
Description
Technical field
The present invention relates to a kind of have the feature of claim 1 preamble, the relief valve of high-pressure service pump in fuel injection system (especially common-rail injection system).In addition, the present invention relates to a kind of high-pressure service pump with this relief valve.
Background technique
Open source literature DE102009027146A1 discloses a kind of high-pressure fuel pump, and it has the area of low pressure in suction side, is furnished with relief valve as pressure controlled valve in this area of low pressure.Described relief valve has: valve chest, and it has an inlet portion and two discharge portions; Movable valve body; And valve spring, this valve spring towards closing direction with pressure-loaded valve body.In order to make the manufacture of high-pressure fuel pump simplify, the valve chest press-in of relief valve or pointing are in the hole of fuel high pressure pump case.
In addition, by the relief valve of the intake line of the batching unit of the high-pressure service pump of the known a kind of fuel injection system of open source literature DE102008042089A1, this relief valve comprises the valve chest with an entrance and at least one outlet, and wherein said outlet can be closed by the control piston of the power movement of energy renitency spring.Pressure spring is received in the spring housing be formed in valve chest, and this spring housing is connected with the entrance of valve chest by least one pressure balance pipeline.Therefore, in spring housing, there is the pressure equal with on the entrance of relief valve, this also causes the bubble avoided in spring housing to gather and thus is avoided consequential relief valve fault.In addition propose, in order to avoid resonating the fault that causes and be configured with restriction in pressure balance pipeline.
Summary of the invention
From prior art above-mentioned, the object of the present invention is to provide a kind of relief valve for high-pressure service pump, this relief valve can be used in pressure and Flow-rate adjustment and can realize pressure change in addition.Described relief valve also should have high functional reliability.
In order to realize described object, a kind of relief valve with claim 1 feature is proposed.Favourable improvement of the present invention provides in the dependent claims.There is furthermore provided a kind of high-pressure service pump with this relief valve.
The relief valve proposed comprises: be displaceably received in the valve element in housing bore, is connected with at least one valve outlet port for making valve inlet; And the spring be received in spring housing, the spring force of this spring is towards the direction charge valve element of valve inlet.Arranged according to the present invention have multiple respectively in the valve outlet port leading to the well format in housing bore diametrically, described valve outlet port in order to construct multistage relief valve (at least comprising the first order and the second level) have different free through flow cross sections and/or with and the mode of the axially different spacing in valve inlet interval arrange.Therefore the relief valve proposed is opened with multiple level, and wherein in described multiple level, quantity and/or the free through flow cross section of the valve outlet port be connected with valve inlet change.This causes, and flow also changes in not at the same level.Flow can adapt to the Operational Limits of the determination of high-pressure service pump in like fashion.When temperature raises, the fuel quantity of that relief valve is discharged, preferred delivery to return line can be increased through, derive such as to produce better heat.
In relief valve of the present invention, flow is preferably by the quantity of valve outlet port and/or determined by the free through flow cross section of at least one valve outlet port described in level.
Preferably, the flow in the first order is less than the flow in the second level.When the number ratio of the valve outlet port be connected with valve inlet in the second level is large in a first stage, obtain the flow of the increase in the second level.Alternatively or additionally, the increase of flow realizes by the free through flow cross section correspondingly increasing at least one valve outlet port described in the second level.Flow in the first order is preferably selected like this, and realization amount is limited.
A preferred embodiment of the invention, the first order only has the valve outlet port that an energy is connected with valve inlet.On the other hand, the second level can have multiple and/or larger valve outlet port, and described valve outlet port (being additional to the valve outlet port of the first order) can be connected with valve inlet.
If the second level comprises multiple valve outlet port, so the quantity of valve outlet port is preferably 2,3 or 4.But the valve outlet port that also can arrange in addition more than four.In addition, described multiple valve outlet port be preferably placed in a radial plane and/or spaced equal angular separation arrange.Realize the evenly through-flow of valve in like fashion.The free through flow cross section of described multiple valve outlet port of the second level is preferably equally selected respectively.
In order to realize the amount restriction in the first order, propose: the free through flow cross section provided by least one valve outlet port of the first order is 0.15mm
2to 0.5mm
2.If the first order comprises multiple valve outlet port that can be connected with valve inlet, the summation of so free through flow cross section is 0.15mm
2to 0.5mm
2.
In order to remove the amount restriction in the second level largely, also propose, the free through flow cross section provided by least one valve outlet port of the second level is 3mm
2to 50mm
2.The obvious increase of flow can be caused in like fashion in the second level.This makes quick scavenging and/or the exhaust that can realize high-pressure service pump when needed.
To strive in the second level asked flow and increase and can read on the characteristic curve of relief valve.Relief valve of the present invention preferably has the characteristic curve skyrocketed towards end.
In addition propose, relief valve pressure of opening in a first stage is 2.0bar to 4.0bar.In the second level, that opens the pressure ratio first order opens pressure preferably large 1bar to 3bar, preferred large 1bar to 2bar further.
Advantageously, in the operation of high-pressure service pump, the spring housing of relief valve does not have liquid fuel substantially.Guarantee that the mobility of valve element does not have thus restricted.Therefore relief valve has high dynamic performance and functional reliability.
A preferred embodiment of the invention, relief valve is arranged like this: valve element makes spring housing seal relative to valve inlet.The a small amount of leakage rate of tolerable from valve element through and arrive in spring housing.In order to discharge described leakage rate, spring housing is attached on return line preferably by hole.
In addition propose, valve element piston shape ground structure.Such valve element can simply and cost advantages ground manufacture.Alternatively or additionally propose, the valve element of described piston shape has the control seamed edge of annular on its end towards valve inlet.This control seamed edge relative at least one valve outlet port described in the determining positions level of described multiple valve outlet port free through flow cross section and thus determine valve flow.
In addition in order to realize starting the object mentioned, the high-pressure service pump proposed comprises according to relief valve of the present invention.Relief valve is arranged in the area of low pressure of high-pressure service pump at this.Preferably, relief valve makes the driving mechanism room of high-pressure service pump be connected with return line.
Accompanying drawing explanation
The preferred embodiment of the present invention is explained in detail below with reference to accompanying drawing.Accompanying drawing illustrates:
Fig. 1 has the cross section of the high-pressure service pump of relief valve of the present invention;
The cross section of the relief valve of the high-pressure service pump of Fig. 2 Fig. 1; And
Fig. 3 is for illustrating the characteristic plotted curve of relief valve of the present invention.
Embodiment
High-pressure service pump shown in Figure 1 comprises the housing 12 of tape drive mechanism room 9, receives the live axle 13 having strap cam 14 in this driving mechanism room 9.Pump piston 16 is supported on cam 14 indirectly by roller tappet 15.The end deviating from cam 14 of pump piston 16 is received in the cylinder holes 17 of housing 12, thus pump piston 16 gauge pump working chamber 18.Pump working chamber 18 to be connected with fuel inlet pipe road 20 by entering valve 19 and to be connected with high pressure accumulator (not shown) by expulsion valve 21.In the suction of high-pressure service pump runs, pump working chamber 18 is by entering valve 19 by fuel charge.In the conveying of high-pressure service pump runs, the fuel in pump working chamber 18 is compressed and is then channeled in high pressure accumulator.
In the housing 12 of high-pressure service pump, be integrated with relief valve 11, can be connected with return line 10 by this relief valve 11 driving mechanism room 9.In like fashion, relief valve 11 can be used for the pressure in driving mechanism room 9 and measures regulating.In addition, relief valve 11 makes it possible to realize equalizing pressure pulses.Because described relief valve comprises the valve element 2 be received in the mode that can move in housing bore 1, this valve element is loaded towards closing direction by the spring force of spring 7, and thus the volume nonuniformity that can compensate driving mechanism room 9 at least partially.
As can be seen from Figure 2 like that, the relief valve 11 multistage ground structure of the high-pressure service pump of Fig. 1.In first order A, a unique valve outlet port 4 being configured to radial hole can be connected with valve inlet 3, thus flow is little.When pressure is 4.0bar, the flow in first order A can be such as 30l/h.If relief valve 11 is opened further, so valve element 2 discharges valve outlet port 5 that is other, that be configured to radial hole respectively, and described other valve outlet port limits second level B.By the connection of described other valve outlet port 5 with valve inlet 3, flow can obviously increase.Such as, the total discharge in the B of the second level can be 200l/h under the pressure of 5.0bar.
Flow in the B of the second level increases the free through flow cross section realization of selecting respectively than the free through flow cross section of valve outlet port 4 large of one side by the quantity increased of valve outlet port 4,5 and on the other hand by valve outlet port 5.
In order to relief valve outlet 4,5, the spring force that valve element 2 must resist spring 7 moves until the control seamed edge 8 of annular of valve element 2 has been crossed towards the seamed edge of valve inlet 3 gauge valve outlet port 4,5.The pressure of opening of relief valve can be regulated by the spring force being received in the spring 7 in spring housing 6.Pressure of opening in first order A can be such as 2.5bar and can such as 4.5bar in the B of the second level.
Possible characteristic curve according to relief valve 11 of the present invention shown in Figure 3.In a first section, characteristic curve has very flat trend.In this position, relief valve cuts out and only a small amount of leakage rate may be passed through from valve element 2 and flow out in return line 10.Exceed first order A open pressure time, flow Q first time obviously rises.Characteristic trend depends on the concrete configuration of first order A, the quantity especially depending on valve outlet port 4 and/or free through flow cross section in this section.But the pressure of opening enlarged markedly along with exceeding second level B of flow Q just realizes first.In this section, characteristic curve skyrockets.This quantity owing to the free through flow cross section of at least one valve outlet port 5 described and/or the valve outlet port 5 of second level B is obviously larger.
Characteristic exceed second level B open pressure after one substitute trend illustrate by a dotted line in figure 3.Here, characteristic rising does not have so steep and extends along a curve.
Claims (10)
1. the relief valve of in fuel injection system, especially in common-rail injection system high-pressure fuel pump, comprise: be displaceably received in the valve element (2) in housing bore (1), this valve element is used for valve inlet (3) and at least one valve outlet port (4,5) are connected; And the spring (7) be received in spring housing (6), the spring force of described spring loads described valve element (2) towards the direction of valve inlet (3),
It is characterized in that, be provided with multiple respectively in the valve outlet port (4 leading to the well format in described housing bore (1) diametrically, 5), described valve outlet port in order to construct multistage relief valve have different free through flow cross sections and/or with and the mode of the axially different spacing in described valve inlet (3) interval arrange, described multistage relief valve at least comprises the first order (A) and the second level (B).
2. relief valve as claimed in claim 1,
It is characterized in that, the flow in the first order (A) is less than the flow in the second level (B).
3. relief valve as claimed in claim 1 or 2,
It is characterized in that, the second level (B) comprises multiple valve outlet port (5), and described valve outlet port is arranged in a radial plane and/or in the mode of spaced equal angular intervals and arranges.
4. the relief valve as described in one of aforementioned claim,
It is characterized in that, the free through flow cross section provided by least one valve outlet port (4) of the first order (A) is 0.15mm
2to 0.5mm
2.
5. the relief valve as described in one of aforementioned claim,
It is characterized in that, the free through flow cross section provided by least one valve outlet port (5) of the second level (B) is 3mm
2to 50mm
2.
6. the relief valve as described in one of aforementioned claim,
It is characterized in that, the open pressure of described relief valve in the first order (A) is 2.0bar to 4.0bar.
7. the relief valve as described in one of aforementioned claim,
It is characterized in that, described relief valve in the second level (B) open the pressure ratio first order (A) open large 1bar to the 3bar of pressure, preferably large 1bar to 2bar.
8. the relief valve as described in one of aforementioned claim,
It is characterized in that, described valve element (2) makes described spring housing (6) seal relative to described valve inlet (3).
9. the relief valve as described in one of aforementioned claim,
It is characterized in that, described valve element (2) piston shape ground constructs and/or on its end towards described valve inlet (3), has the control seamed edge (8) of annular.
10. for the high-pressure service pump of fuel injection system, especially common-rail injection system, have according to the relief valve (11) one of aforementioned claim Suo Shu, wherein, described relief valve (11) to be arranged in the area of low pressure of high-pressure service pump and preferably to make the driving mechanism room (9) of high-pressure service pump be connected with return line (10).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102013208707.1 | 2013-05-13 | ||
| DE102013208707.1A DE102013208707A1 (en) | 2013-05-13 | 2013-05-13 | Overflow valve for a high pressure pump in a fuel injection system |
| PCT/EP2014/055122 WO2014183904A1 (en) | 2013-05-13 | 2014-03-14 | Overflow valve for a high pressure pump in a fuel injection system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105408619A true CN105408619A (en) | 2016-03-16 |
Family
ID=50277248
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201480028140.8A Pending CN105408619A (en) | 2013-05-13 | 2014-03-14 | Overflow valve for high pressure pump in fuel injection system |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN105408619A (en) |
| DE (1) | DE102013208707A1 (en) |
| WO (1) | WO2014183904A1 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107763260A (en) * | 2017-10-20 | 2018-03-06 | 珠海格力电器股份有限公司 | Relief valve and air-conditioning system |
| CN108571407A (en) * | 2017-03-10 | 2018-09-25 | 罗伯特·博世有限公司 | For the pressure controlled overflow valve and fuel injection system in fuel injection system |
| CN109154262A (en) * | 2016-05-17 | 2019-01-04 | 罗伯特·博世有限公司 | For the overflow valve of high-pressure pump, high-pressure pump and method for running overflow valve |
| CN110081180A (en) * | 2019-04-29 | 2019-08-02 | 罗彬彬 | A kind of material controlling type eduction valve |
| CN111636942A (en) * | 2020-04-29 | 2020-09-08 | 潍坊职业学院 | Hydraulic drive variable valve timing mechanism |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB201600768D0 (en) * | 2016-01-15 | 2016-03-02 | Delphi Internat Operations Luxembourg S À R L | High pressure fuel pumps |
| DE102018201734A1 (en) | 2018-02-05 | 2019-08-08 | Robert Bosch Gmbh | Overflow valve for a fuel injection system, fuel injection system |
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| CN1460667A (en) * | 2003-06-18 | 2003-12-10 | 清华大学 | Pineapplie leaf extract, its preparation method and application |
| US6899088B2 (en) * | 2000-09-20 | 2005-05-31 | Stanadyne Corporation | Flow intensifier for cold starting gasoline direct injection engine |
| US7438057B2 (en) * | 2004-08-03 | 2008-10-21 | Robert Bosch Gmbh | Fuel injection system |
| CN100460667C (en) * | 2004-02-06 | 2009-02-11 | 博世株式会社 | Fuel supply system |
| CN101903642A (en) * | 2007-12-21 | 2010-12-01 | 罗伯特·博世有限公司 | Pressure regulating valve for regulating the pressure in a high-pressure reservoir |
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| DE102010042582A1 (en) * | 2010-10-18 | 2012-04-19 | Robert Bosch Gmbh | Overflow valve for pressure control in common-rail fuel injection system of combustion engine, has outlet controlled by piston under adjustment of resetting geometry that is designed such that small resetting cross-section is released |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| IT1310754B1 (en) * | 1999-11-30 | 2002-02-22 | Elasis Sistema Ricerca Fiat | VALVE SYSTEM FOR INLET PRESSURE CONTROL OF A LIQUID IN A HIGH PRESSURE PUMP, AND RELATED VALVE |
| DE102008042089A1 (en) | 2008-09-15 | 2010-03-18 | Robert Bosch Gmbh | Overflow valve for inlet pipe of dosing unit of high-pressure pump of fuel injecting device of internal combustion engine, has spring area that is connected with inlet via pressure balance pipeline, where throttle is provided in pipeline |
| DE102009027146A1 (en) | 2009-06-24 | 2010-12-30 | Robert Bosch Gmbh | Fuel high-pressure pump for fuel system of internal combustion engine, has suction side low pressure area, in which overflow valve is arranged, where overflow valve has valve housing with inlet, outlet, valve body and valve spring |
| DE102009027335A1 (en) * | 2009-06-30 | 2011-01-05 | Robert Bosch Gmbh | Fuel system for an internal combustion engine |
| DE102010043531A1 (en) * | 2010-11-08 | 2012-05-10 | Robert Bosch Gmbh | Fuel injection system of an internal combustion engine |
-
2013
- 2013-05-13 DE DE102013208707.1A patent/DE102013208707A1/en not_active Withdrawn
-
2014
- 2014-03-14 WO PCT/EP2014/055122 patent/WO2014183904A1/en active Application Filing
- 2014-03-14 CN CN201480028140.8A patent/CN105408619A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6899088B2 (en) * | 2000-09-20 | 2005-05-31 | Stanadyne Corporation | Flow intensifier for cold starting gasoline direct injection engine |
| CN1460667A (en) * | 2003-06-18 | 2003-12-10 | 清华大学 | Pineapplie leaf extract, its preparation method and application |
| CN100460667C (en) * | 2004-02-06 | 2009-02-11 | 博世株式会社 | Fuel supply system |
| US7438057B2 (en) * | 2004-08-03 | 2008-10-21 | Robert Bosch Gmbh | Fuel injection system |
| CN101903642A (en) * | 2007-12-21 | 2010-12-01 | 罗伯特·博世有限公司 | Pressure regulating valve for regulating the pressure in a high-pressure reservoir |
| CN101903642B (en) * | 2007-12-21 | 2013-03-06 | 罗伯特·博世有限公司 | Pressure regulating valve for regulating the pressure in a high-pressure reservoir |
| DE102010031595A1 (en) * | 2010-07-21 | 2012-01-26 | Robert Bosch Gmbh | Fuel pump i.e. gear pump, for conveying fuel in fuel injection system of combustion engine for common-rail system, has relief valve arranged at case, where pressure at maximum overflow rate is small than opening pressure of relief valve |
| DE102010042582A1 (en) * | 2010-10-18 | 2012-04-19 | Robert Bosch Gmbh | Overflow valve for pressure control in common-rail fuel injection system of combustion engine, has outlet controlled by piston under adjustment of resetting geometry that is designed such that small resetting cross-section is released |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109154262A (en) * | 2016-05-17 | 2019-01-04 | 罗伯特·博世有限公司 | For the overflow valve of high-pressure pump, high-pressure pump and method for running overflow valve |
| CN109154262B (en) * | 2016-05-17 | 2021-07-27 | 罗伯特·博世有限公司 | Overflow valve for a high-pressure pump, high-pressure pump and method for operating an overflow valve |
| CN108571407A (en) * | 2017-03-10 | 2018-09-25 | 罗伯特·博世有限公司 | For the pressure controlled overflow valve and fuel injection system in fuel injection system |
| CN108571407B (en) * | 2017-03-10 | 2022-04-15 | 罗伯特·博世有限公司 | Overflow valve for pressure regulation in a fuel injection system and fuel injection system |
| CN107763260A (en) * | 2017-10-20 | 2018-03-06 | 珠海格力电器股份有限公司 | Relief valve and air-conditioning system |
| CN107763260B (en) * | 2017-10-20 | 2023-12-26 | 珠海格力电器股份有限公司 | Pressure relief valve and air conditioning system |
| CN110081180A (en) * | 2019-04-29 | 2019-08-02 | 罗彬彬 | A kind of material controlling type eduction valve |
| CN111636942A (en) * | 2020-04-29 | 2020-09-08 | 潍坊职业学院 | Hydraulic drive variable valve timing mechanism |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2014183904A1 (en) | 2014-11-20 |
| DE102013208707A1 (en) | 2014-11-13 |
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|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20160316 |