CN108150324B - High-pressure oil pump for engine fuel system and engine fuel system - Google Patents
High-pressure oil pump for engine fuel system and engine fuel system Download PDFInfo
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- CN108150324B CN108150324B CN201711440458.9A CN201711440458A CN108150324B CN 108150324 B CN108150324 B CN 108150324B CN 201711440458 A CN201711440458 A CN 201711440458A CN 108150324 B CN108150324 B CN 108150324B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- 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
- F02M37/0047—Layout or arrangement of systems for feeding fuel
- F02M37/0052—Details on the fuel return circuit; Arrangement of pressure regulators
- F02M37/0058—Returnless fuel systems, i.e. the fuel return lines are not entering the fuel tank
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Lubrication Of Internal Combustion Engines (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
The invention belongs to the technical field of engines, and particularly relates to a high-pressure oil pump for an engine fuel system and the engine fuel system. The high-pressure oil pump comprises a zero flow hole and an oil quantity metering valve, wherein the zero flow hole is formed in a first oil return pipeline, the one-way valve is arranged on a second oil return pipeline, and the one-way valve is used for enabling fuel oil which passes through the oil quantity metering valve and is slightly leaked to flow back to the oil inlet end of the oil delivery pump through the one-way valve under the condition that the oil quantity metering valve is closed and the oil return back pressure exceeds the oil return boundary of the fuel oil. By using the high-pressure oil pump for the engine fuel system and the engine fuel system, the one-way valve is connected in parallel on the oil return pipeline of the zero-flow hole, so that leaked fuel oil is effectively introduced to the front end of the oil delivery pump after the oil mass metering valve is closed, the leaked fuel oil is prevented from entering the high-pressure cavity, and the normal operation of an engine is ensured.
Description
Technical Field
The invention belongs to the technical field of engines, and particularly relates to a high-pressure oil pump for an engine fuel system and the engine fuel system.
Background
In existing engines, particularly fuel (e.g., diesel) engines, a high pressure oil pump is typically used to convert low pressure fuel (e.g., low pressure diesel) from a fuel tank to high pressure fuel. For example, fig. 1 is a hydraulic schematic diagram of a fuel system of an engine in the prior art, in which at the time of engine start, fuel stored in a first fuel tank 10' is filtered by a fuel filter by pumping oil of a first fuel delivery pump 20' and then delivered to a first fuel metering valve 30' through a low pressure fuel line. Then, the fuel is delivered to the first high-pressure pump 40' after being metered by the first fuel amount metering valve 30', and is pressurized by the first high-pressure pump 40' and then enters the common rail through the high-pressure fuel line, and then, the fuel is distributed to the injectors from the common rail and is injected into the cylinders. In addition, a first zero flow hole 50' is formed in the oil return pipeline behind the first oil metering valve 30', and the first zero flow hole 50' is used for discharging fuel oil slightly leaked through the first oil metering valve 30' under the condition that the first oil metering valve 30' is closed, so that the leaked fuel oil is prevented from entering a common rail pipe high-pressure cavity to cause rail pressure abnormity.
However, under the harsh working conditions, the site where the oil return back pressure exceeds the oil return boundary of the fuel often occurs, so that the leakage effect of the first zero flow hole 50 'is blocked, the fuel continues to enter the high pressure cavity under the condition that the first oil metering valve 30' is closed, the rail pressure is over-limited, even the PRV valve is open and fails, and the engine cannot normally operate.
Disclosure of Invention
The present invention is directed to solving at least one of the problems set forth above, and the object is achieved by the following means.
The invention provides a high-pressure oil pump for an engine fuel system, which comprises a zero flow hole and an oil metering valve, wherein the zero flow hole is arranged on a first oil return pipeline and is used for enabling fuel oil which slightly leaks through the oil metering valve to flow back to an oil tank through the zero flow hole under the condition that the oil metering valve is closed;
and the check valve is arranged on the second oil return pipeline and used for enabling the fuel oil which passes through the small leakage of the oil metering valve to flow back to the oil inlet end of the oil delivery pump through the check valve under the condition that the oil metering valve is closed and the oil return back pressure exceeds the oil return boundary of the fuel oil, and the opening pressure of the check valve is set to enable the fuel oil which passes through the small leakage of the oil metering valve to be opened.
The invention also provides a high-pressure oil pump for an engine fuel system, which comprises a zero flow hole and an oil metering valve, wherein the zero flow hole is arranged on an oil return pipeline, the zero flow hole is used for enabling fuel oil which slightly leaks through the oil metering valve to return through the zero flow hole under the condition that the oil metering valve is closed, a first oil return pipeline and a second oil return pipeline are arranged at the oil outlet end of the zero flow hole, the first oil return pipeline is used for returning oil to an oil tank, the second oil return pipeline is used for returning oil to the oil inlet end of the oil delivery pump, a one-way valve is arranged on the second oil return pipeline, the one-way valve is used for enabling the fuel oil which slightly leaks through the oil metering valve to return to the oil inlet end of the oil delivery pump through the one-way valve under the condition that the oil metering valve is closed and the oil return back pressure exceeds the oil return boundary, and the opening pressure of the one-way valve is set to enable the fuel oil which slightly leaks through the oil metering valve to also to The one-way valve can be opened.
Furthermore, a venturi tube is arranged on the second oil return pipeline, and the one-way valve returns oil to the oil inlet end of the oil transfer pump through the venturi tube.
Furthermore, a throttle valve is arranged on the second oil return pipeline and used for preventing the negative pressure of the oil transfer pump from sucking the one-way valve open in normal work.
The invention also provides an engine fuel system, which comprises the high-pressure oil pump for the engine fuel system.
Further, the engine fuel system also comprises an electric pump, wherein the electric pump is arranged between the oil tank and the fuel delivery pump, and the electric pump is used for enabling the common rail engine to quickly discharge gas in a pipeline and establish rail pressure when the common rail engine is started.
Furthermore, the engine fuel system further comprises a fuel coarse filter and a fuel fine filter, wherein the fuel coarse filter is arranged on an oil inlet pipeline of the oil transfer pump, and the fuel fine filter is arranged on an oil outlet pipeline of the oil transfer pump.
Furthermore, the engine fuel system also comprises a bypass valve which is connected with the fuel delivery pump in parallel and used for discharging gas in the fuel tank.
By using the high-pressure oil pump for the engine fuel system and the engine fuel system, the one-way valve is connected in parallel on the oil return pipeline of the zero-flow hole, so that leaked fuel oil is effectively introduced to the front end of the oil delivery pump after the oil mass metering valve is closed, the leaked fuel oil is prevented from entering a high-pressure cavity to cause rail pressure overrun, and the normal operation of an engine is ensured.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
FIG. 1 is a hydraulic schematic of a prior art engine fuel system;
FIG. 2 is a hydraulic schematic of an embodiment of the present invention;
fig. 3 is a hydraulic schematic of another embodiment of the present invention.
The reference symbols in the drawings denote the following:
10': first tank, 20': first oil delivery pump, 30': first oil amount metering valve, 40': first high-pressure pump, 50': a first zero flow orifice;
10: oil tank, 20: oil delivery pump, 30: oil amount metering valve, 40: high-pressure pump, 50: zero flow orifice, 60: check valve, 70: venturi tube, 80: a throttle valve.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
FIG. 2 is a hydraulic schematic of an embodiment of the present invention. As shown in fig. 2, the fuel system of the engine in the present embodiment includes a high-pressure oil pump, wherein the high-pressure oil pump includes a zero flow hole 50 and a fuel metering valve 30, the zero flow hole 50 is provided on the first fuel return line, and the zero flow hole 50 is used for returning the fuel of a slight leakage passing through the fuel metering valve 30 to the fuel tank 10 via the zero flow hole 50 in a state that the fuel metering valve 30 is closed.
The high-pressure oil pump in the present embodiment further includes a check valve 60, the check valve 60 being provided on the second return line, the check valve 60 being configured to allow the slightly leaked fuel that has passed through the fuel metering valve 30 to flow back to the fuel inlet end of the fuel feed pump 20 via the check valve 60 in a case where the fuel metering valve 30 is closed and the return back pressure exceeds the fuel return boundary, the opening pressure of the check valve 60 being set so that the check valve 60 can be opened even with the slightly leaked fuel that has passed through the fuel metering valve 30.
In this embodiment, the oil inlet end of the zero flow hole 50 and the oil inlet end of the check valve 60 are connected to the oil outlet end of the oil metering valve 30, respectively, the oil outlet end of the zero flow hole 50 is connected to the oil tank 10, and the oil outlet end of the check valve 60 is connected to the oil inlet end of the oil transfer pump 20. When the high-pressure oil pump is operating normally, the fuel in the fuel tank 10 is supplied to the fuel metering valve 30 by the pumping action of the fuel delivery pump 20. Then, the fuel is metered by the fuel metering valve 30 to the high-pressure pump 40, pressurized by the high-pressure pump 40, and introduced into the common rail through the high-pressure fuel line, and then, the fuel is distributed from the common rail to the injectors and injected into the cylinders.
When the supplied fuel is excessive, the fuel metering valve 30 is closed. At this time, a small amount of fuel leaks from the fuel metering valve 30, and in order to prevent the leaked fuel from entering the high pressure chamber and causing the rail pressure to exceed the limit, the output end of the fuel metering valve 30 is further connected with a zero flow hole 50. The return is performed through the zero flow hole 50, and the leaked fuel is delivered to the fuel tank 10.
In order to prevent the leaked fuel oil from being unable to return due to the fact that the return back pressure exceeds the fuel oil return boundary in the oil return process, a check valve 60 is further connected in parallel at the inlet of the zero oil return hole 50, the oil inlet end of the check valve 60 is connected with the outlet end of the oil metering valve 30, and the outlet end of the check valve 60 is connected with the inlet end of the oil delivery pump 20, so that when the return back pressure exceeds the fuel oil return boundary, the leaked fuel oil is returned to the inlet end of the oil delivery pump 20 through the check valve 60, the fuel oil is prevented from gathering and entering a high-pressure cavity, the rail pressure is prevented from exceeding the limit, and the. Wherein the opening pressure of the check valve 60 is designed according to the application boundary of the back pressure of the oil return, it should be ensured that the check valve 60 can be opened even by a minute leakage of the fuel passing through the fuel gauge valve 30. Meanwhile, in the embodiment, the check valve 60 is connected in parallel at the inlet of the zero oil return hole 50, so that the fuel oil can be prevented from being unable to return due to the blockage of the zero oil return hole 50.
Further, in order to improve the oil discharge efficiency, a venturi tube 70 is provided on the second oil return line, and the check valve 60 returns oil to the oil inlet end of the oil delivery pump 20 through the venturi tube 70.
A venturi tube 70 is designed behind the check valve 60, and the check valve 60 is communicated to the front end portion of the oil transfer pump 20 through the venturi tube 70 to achieve rapid oil return.
Further, a throttle valve 80 is arranged on the second oil return pipeline, and the throttle valve 80 is used for preventing the one-way valve 60 from being sucked open when the negative pressure of the oil transfer pump 20 works normally, so that the use safety of the high-pressure oil pump is improved.
Further, the high-pressure oil pump in the present embodiment further includes an electric pump. As shown in fig. 2, an electric pump is provided between the oil tank 10 and the fuel feed pump 20 for enabling the common rail engine to quickly discharge gas in the line and establish a rail pressure at the time of starting.
Further, a bypass valve is connected in parallel to the oil feed pump 20. The gas exhausted by the electric pump is exhausted out of the system along with the oil return pipeline through the bypass valve.
Further, in order to improve the oil quality and prevent each component in the fuel system from being blocked, the high-pressure oil pump in the embodiment further comprises a fuel coarse filter and a fuel fine filter. The fuel coarse filter is arranged on an oil inlet pipeline of the fuel delivery pump 20, and the fuel fine filter is arranged on an oil outlet pipeline of the fuel delivery pump 20. Through the double filtration of the fuel coarse filter and the fuel fine filter, the impurity content in the oil is effectively reduced, the valve hole is prevented from being blocked by impurities, and the reliability of the system operation is improved.
Fig. 3 is a hydraulic schematic of another embodiment of the present invention. As shown in fig. 3, the only difference between this embodiment and the previous embodiment is that the oil inlet end of the check valve 60 in this embodiment is connected to the oil outlet end of the zero flow hole 50, and the oil outlet end of the check valve 60 is also connected to the oil inlet end of the fuel delivery pump 20, which can also serve the purpose of oil return through the check valve 60 when the return back pressure exceeds the fuel return boundary.
By using the high-pressure oil pump for the engine fuel system and the engine fuel system, the one-way valve is connected in parallel on the oil return pipeline of the zero-flow hole, so that leaked fuel oil is effectively introduced to the front end of the oil delivery pump after the oil mass metering valve is closed, the leaked fuel oil is prevented from entering a high-pressure cavity to cause rail pressure overrun, and the normal operation of an engine is ensured.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (7)
1. A high pressure oil pump for an engine fuel system, comprising:
the fuel metering valve comprises a zero flow hole and a fuel metering valve, wherein the zero flow hole is formed in a first oil return pipeline and is used for enabling micro-leaked fuel passing through the fuel metering valve to flow back to a fuel tank through the zero flow hole under the condition that the fuel metering valve is closed; and
the check valve, the check valve is located the second and is returned oil pipe way, the check valve is used for the fuel gauge valve closes and the oil return backpressure makes under the condition that surpasss fuel oil return border and passes through the fuel oil of the small seepage of fuel gauge valve via the check valve flows back to the oil feed end department of fuel delivery pump, the opening pressure of check valve sets for even making to pass through the fuel oil of the small seepage of fuel gauge valve also can open the check valve, be equipped with the choke valve on the second returns oil pipe way, the choke valve is used for preventing the negative pressure of fuel delivery pump will when normal work the check valve is inhaled and is opened.
2. The utility model provides a high-pressure oil pump for engine fuel oil system, its characterized in that, includes zero flow hole and oil mass metering valve, zero flow hole is located and is returned oil pipe way, zero flow hole is used for making under the condition that oil mass metering valve closed and pass through the fuel via of the small seepage of oil mass metering valve the zero flow hole is returned oil, the play oil end department in zero flow hole is equipped with first time oil pipe way and second time oil pipe way, first time oil pipe way is used for returning oil to the oil tank, second time oil pipe way is used for returning oil to the oil feed end of oil transfer pump, be equipped with the check valve on the second time oil pipe way, the check valve is used for make under the condition that oil mass metering valve closed and return oil backpressure surpassed fuel oil return border pass through the fuel via of the small seepage of oil mass metering valve flows back to the oil feed end department of oil transfer pump, the opening pressure of check valve sets for so that even pass through the fuel of the small The check valve can also be opened, a throttle valve is arranged on the second oil return pipeline, and the throttle valve is used for preventing the check valve from being sucked open when the negative pressure of the oil transfer pump works normally.
3. The high-pressure oil pump for the engine fuel system according to claim 1 or 2, characterized in that a venturi tube is arranged on the second oil return pipeline, and the check valve returns oil to the oil inlet end of the oil delivery pump through the venturi tube.
4. An engine fuel system, characterized by comprising a high-pressure oil pump for an engine fuel system as claimed in any one of claims 1 to 3.
5. The engine fuel system of claim 4, further comprising an electric pump disposed between the fuel tank and the fuel delivery pump, the electric pump being configured to enable the common rail engine to rapidly vent gas in the line and establish rail pressure at start-up.
6. The engine fuel system of claim 4, further comprising a fuel strainer disposed on an oil inlet line of the fuel delivery pump and a fuel fine filter disposed on an oil outlet line of the fuel delivery pump.
7. The engine fuel system of claim 4, further comprising a bypass valve connected in parallel with the fuel delivery pump for venting gas from the fuel tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711440458.9A CN108150324B (en) | 2017-12-27 | 2017-12-27 | High-pressure oil pump for engine fuel system and engine fuel system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711440458.9A CN108150324B (en) | 2017-12-27 | 2017-12-27 | High-pressure oil pump for engine fuel system and engine fuel system |
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| Publication Number | Publication Date |
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| CN108150324A CN108150324A (en) | 2018-06-12 |
| CN108150324B true CN108150324B (en) | 2020-01-03 |
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| CN201711440458.9A Active CN108150324B (en) | 2017-12-27 | 2017-12-27 | High-pressure oil pump for engine fuel system and engine fuel system |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111156119A (en) * | 2019-12-30 | 2020-05-15 | 潍柴动力股份有限公司 | Fuel system and method for detecting aging of fuel system |
| CN111878272B (en) * | 2020-06-30 | 2021-10-29 | 潍柴动力股份有限公司 | Exhaust device and exhaust method for high-pressure oil pump |
| CN112304398A (en) * | 2020-09-27 | 2021-02-02 | 长沙五七一二飞机工业有限责任公司 | Helicopter fuel flow sensor test device |
| CN112431698A (en) * | 2020-11-03 | 2021-03-02 | 无锡华友发电设备有限公司 | Device for realizing stable fuel supply of diesel generator set |
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| DE102009028614A1 (en) * | 2009-08-18 | 2011-02-24 | Robert Bosch Gmbh | Fuel injection system for internal-combustion engine, has zero-feed throttle that is formed in area of return socket of return unit such that leakage pipe opens in ring channel |
| CN102472219A (en) * | 2009-06-30 | 2012-05-23 | 罗伯特·博世有限公司 | Fuel system for an internal combustion engine |
| CN103201496A (en) * | 2010-11-08 | 2013-07-10 | 罗伯特·博世有限公司 | Fuel injection system of an internal combustion engine |
| EP2708728A2 (en) * | 2012-09-17 | 2014-03-19 | Robert Bosch Gmbh | Low pressure circuit for a fuel injection system |
| CN106246424A (en) * | 2016-08-29 | 2016-12-21 | 潍柴动力股份有限公司 | High-pressure oil pump, engine fuel oil system and electromotor |
| CN106246429A (en) * | 2016-08-30 | 2016-12-21 | 潍柴动力股份有限公司 | Engine fuel oil system and include the electromotor of this engine fuel oil system |
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2017
- 2017-12-27 CN CN201711440458.9A patent/CN108150324B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102472219A (en) * | 2009-06-30 | 2012-05-23 | 罗伯特·博世有限公司 | Fuel system for an internal combustion engine |
| DE102009028614A1 (en) * | 2009-08-18 | 2011-02-24 | Robert Bosch Gmbh | Fuel injection system for internal-combustion engine, has zero-feed throttle that is formed in area of return socket of return unit such that leakage pipe opens in ring channel |
| CN103201496A (en) * | 2010-11-08 | 2013-07-10 | 罗伯特·博世有限公司 | Fuel injection system of an internal combustion engine |
| EP2708728A2 (en) * | 2012-09-17 | 2014-03-19 | Robert Bosch Gmbh | Low pressure circuit for a fuel injection system |
| CN106246424A (en) * | 2016-08-29 | 2016-12-21 | 潍柴动力股份有限公司 | High-pressure oil pump, engine fuel oil system and electromotor |
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| CN108150324A (en) | 2018-06-12 |
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