CN110748446A - Common rail high-pressure oil inlet and outlet valve assembly and common rail high-pressure oil supply pump - Google Patents
Common rail high-pressure oil inlet and outlet valve assembly and common rail high-pressure oil supply pump Download PDFInfo
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- CN110748446A CN110748446A CN201911182592.2A CN201911182592A CN110748446A CN 110748446 A CN110748446 A CN 110748446A CN 201911182592 A CN201911182592 A CN 201911182592A CN 110748446 A CN110748446 A CN 110748446A
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- oil
- oil inlet
- inlet
- duct
- outlet
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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
- 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
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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
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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
- F02M37/04—Feeding by means of driven pumps
- F02M37/06—Feeding by means of driven pumps mechanically driven
Abstract
The invention relates to a common rail high-pressure oil inlet and outlet valve assembly which comprises a plunger sleeve, wherein a plunger cavity, a connecting cavity and an oil inlet hole are formed in the plunger sleeve; the plunger is inserted in the plunger cavity in a sliding manner; the oil outlet joint is arranged on the connecting cavity and is provided with a seventh oil duct; the oil inlet valve seat is arranged in the connecting cavity and is in sealed connection with the plunger cavity, a first oil duct and a second oil duct communicated with the oil inlet hole and the plunger cavity are arranged on the oil inlet valve seat, and the first oil duct is communicated with the plunger cavity; the oil inlet valve core is arranged on the second oil duct and is tightly pressed on the second oil duct to form a first sealing surface, and the first sealing surface is used for switching on and off the second oil duct; the oil outlet valve seat is hermetically arranged between the oil inlet valve seat and the oil outlet joint, and a fourth oil duct which is respectively communicated with the first oil duct and the seventh oil duct is arranged on the oil outlet valve seat; and the oil outlet valve core is arranged on the fourth oil duct and is tightly pressed on the fourth oil duct to form a second sealing surface, and the second sealing surface is used for switching on and off the fourth oil duct. The oil valve component has the advantages of simple structure, reasonable oil passage arrangement, high oil filling efficiency and good sealing property.
Description
Technical Field
The invention relates to the technical field of common rails, in particular to a common rail high-pressure oil inlet and outlet valve assembly and a common rail high-pressure oil supply pump.
Background
Along with the gradual upgrade of emission regulations and the increasing aggravation of energy crisis, the requirements of a diesel engine on a fuel system are increased day by day, in order to meet the performance indexes of the diesel engine such as emission performance, economy and reliability, an electronic control high-pressure common rail system is generally adopted by the fuel injection system of the diesel engine, high-pressure oil of the common rail injection system is established by a high-pressure oil supply pump, the high-pressure oil supply pump is a key component forming the common rail system, the key performance indexes such as reliability, oil filling efficiency and pump oil performance directly determine the performance of the common rail system, an oil inlet and outlet valve is one of core components of the high-pressure oil supply pump, and the performance characteristics, the reliability and the like of the oil inlet and.
The high-pressure oil supply pump is divided into two structural forms of an in-line pump and a rotor pump, the power range matched by the in-line pump is larger, and the diesel engine adopts more in-line pumps. When the in-line high-pressure pump works, a gear train of the diesel engine drives a cam shaft to rotate, and the cam shaft drives a plunger matching part to move up and down to realize the oil filling process and the oil pressing process of a plunger, so that high-pressure diesel oil is provided for a common rail system.
In the current common rail system, the commonly adopted structure of the oil inlet and outlet valve assembly is complex, so that the arrangement of an oil inlet channel is unreasonable, the oil filling efficiency is low, the sealing effect is poor, and the high-pressure oil supply pump cannot exert the maximum working capacity.
Disclosure of Invention
In order to solve the problems, the invention provides a common rail high-pressure oil inlet and outlet valve component which has reasonable oil passage arrangement, high oil filling efficiency and good sealing performance and can improve the oil supply capacity of a high-pressure oil supply pump, and the specific technical scheme is as follows:
a common rail high-pressure oil inlet and outlet valve assembly comprises a plunger sleeve, wherein a plunger cavity, a connecting cavity and an oil inlet hole are formed in the plunger sleeve, and the connecting cavity is respectively communicated with the plunger cavity and the oil inlet hole; a plunger slidably inserted in the plunger cavity; the oil outlet joint is hermetically arranged on the connecting cavity and is provided with a seventh oil duct; the plunger piston is characterized by further comprising an oil inlet valve seat, wherein the oil inlet valve seat is hermetically arranged in the connecting cavity and is hermetically connected with the plunger piston cavity, a first oil duct and a second oil duct communicated with the oil inlet hole and the plunger piston cavity are arranged on the oil inlet valve seat, and the first oil duct is communicated with the plunger piston cavity; the oil inlet valve core is arranged on the second oil duct and tightly pressed on the second oil duct to form a first sealing surface, and the first sealing surface is used for the connection and disconnection of the second oil duct; the oil outlet valve seat is hermetically arranged between the oil inlet valve seat and the oil outlet joint, and a fourth oil duct is arranged on the oil outlet valve seat and is respectively communicated with the first oil duct and the seventh oil duct; and the oil outlet valve core is arranged on the fourth oil duct and tightly pressed on the fourth oil duct to form a second sealing surface, and the second sealing surface is used for switching on and off the fourth oil duct.
By adopting the technical scheme, the oil inlet valve seat and the oil inlet valve core form the oil inlet check valve, the oil outlet valve seat and the oil outlet valve core form the oil outlet check valve, the plunger descends during oil inlet, the first sealing surface is opened, diesel oil enters the plunger cavity, the second sealing surface is closed at the moment, during oil outlet, the first sealing surface is closed, the second sealing surface is opened, and the diesel oil enters the seventh oil duct and flows out.
The structure is greatly simplified through the oil inlet valve seat, the oil inlet valve core, the oil outlet valve seat and the oil outlet valve core, the oil duct is reasonable in arrangement, the oil charging efficiency is improved, the sealing performance is good, and the processing difficulty of parts is reduced.
Further, an oil inlet cavity is formed in the inner wall of the connecting cavity and/or the outer wall of the oil inlet valve seat, and the oil inlet cavity is communicated with the oil inlet hole and the second oil duct.
By adopting the technical scheme, the oil inlet cavity can reduce the assembly requirement, and the oil inlet hole is convenient to be communicated with the second oil duct.
The plunger cavity is provided with a first oil passage and a second oil passage, the first oil passage is communicated with the second oil passage, the second oil passage is communicated with the first oil passage, the second oil passage is communicated with the second oil passage, the first oil passage is communicated with the second oil passage, the second oil passage is communicated with the second oil passage, and the second oil passage is communicated with the second oil passage.
Through adopting above-mentioned technical scheme, the oil feed spring makes the oil feed case compress tightly on the second oil duct automatically, forms effectual sealed, guarantees good sealing performance, and the reliability of producing oil is guaranteed to the first sealed face of self-sealing simultaneously when producing oil.
The plunger piston is characterized by further comprising an oil inlet valve sleeve, wherein the oil inlet valve sleeve is hermetically arranged in a valve sleeve hole of the oil inlet valve seat, a third oil duct and a valve sleeve oil hole which are communicated with each other are arranged on the oil inlet valve sleeve, the third oil duct is communicated with the second oil duct, and the valve sleeve oil hole is communicated with the plunger piston cavity; the oil inlet valve core is inserted in the valve sleeve oil hole in a sliding mode, one end of the oil inlet valve core is tightly pressed on the valve sleeve oil hole to form the first sealing surface, and the oil inlet spring is used for enabling the oil inlet valve core to be tightly pressed on the valve sleeve oil hole.
By adopting the technical scheme, when the existing oil inlet valve enters the plunger cavity from the oil inlet cavity, the oil duct needs to turn by 180 degrees to enter the plunger cavity, the oil filling efficiency is low, the dead volume of the upper end of the plunger is large, the response speed of oil filling is low, the oil inlet cavity is directly communicated with the plunger cavity through the oil inlet valve sleeve, the oil filling efficiency is improved, the dead volume of the upper end of the plunger is reduced, and the response speed of oil filling is high.
Furthermore, an oil inlet spring seat is arranged at the other end of the oil inlet valve core, the oil inlet spring is movably inserted on the oil inlet valve core, and the oil inlet spring is positioned between the oil inlet spring seat and the oil inlet valve sleeve; the fixing mode between the oil inlet spring seat and the oil inlet valve core is one of bolt fixing, retainer ring fixing, interference fit fixing, thread fixing or welding fixing.
Through adopting above-mentioned technical scheme, the installation of oil feed spring is made things convenient for to the oil feed spring holder, makes the automatic compressing tightly of oil feed case on the oil inlet valve cover.
Furthermore, a fifth oil duct is arranged on the surface of the oil outlet joint, which is in contact with the oil outlet valve seat, and the fifth oil duct is respectively communicated with the fourth oil duct and the seventh oil duct; the oil outlet spring is arranged in the fifth oil duct and used for pressing the oil outlet valve core on the fourth oil duct to form a second sealing surface.
Through adopting above-mentioned technical scheme, the case that produces oil compresses tightly on the disk seat that produces oil through the spring that produces oil automatically, realizes the automatic seal of second sealed face.
The oil outlet spring seat is mounted in the fifth oil duct, a fixing column is arranged on the oil outlet spring seat, a sixth oil duct is arranged on the fixing column and is respectively communicated with the seventh oil duct inlet and the fifth oil duct, the oil outlet spring is movably inserted into the fixing column, and the oil outlet spring is located between the oil outlet valve core and the oil outlet spring seat.
Through adopting above-mentioned technical scheme, the installation of the spring of producing oil is made things convenient for to the spring holder of producing oil, plays the effect of location to the spring of producing oil, makes the spring of producing oil remain stable direction that compresses tightly, guarantees the sealed reliability of second sealed face.
Further, the first sealing surface is one of a conical surface seal, a plane seal or a spherical surface seal; the second sealing surface is one of a conical surface seal, a plane surface seal or a spherical surface seal.
The common rail high-pressure oil supply pump comprises a common rail high-pressure oil inlet and outlet valve assembly; an oil transfer pump; the cam device is connected with a diesel engine gear train and is also respectively connected with the oil delivery pump and a plunger of the common rail high-pressure oil inlet and outlet valve assembly; the fuel metering valve is respectively connected with the fuel delivery pump and the oil inlet hole; the filter is connected with the oil transfer pump; the oil tank is respectively connected with the oil transfer pump and the filter; and the zero-fuel-supply throttling valve is arranged between the fuel metering valve and the fuel inlet hole and is also connected with the fuel tank.
Compared with the prior art, the invention has the following beneficial effects:
the common rail high-pressure oil inlet and outlet valve assembly provided by the invention has the advantages of simple structure, reasonable oil passage arrangement, high oil filling efficiency and good sealing property, and can improve the oil supply capacity of a high-pressure oil supply pump. The common rail high-pressure oil supply pump provided by the invention has high oil filling efficiency and good oil supply performance.
Drawings
FIG. 1 is a cross-sectional view of a common rail high pressure inlet and outlet valve assembly;
FIG. 2 is a schematic diagram of a common rail high pressure inlet/outlet valve assembly filling process;
FIG. 3 is a schematic view of the oil outlet process of a common rail high pressure inlet/outlet valve assembly;
FIG. 4 is a schematic view of various sealing patterns of the first sealing surface;
fig. 5 is a schematic structural view of a common rail high-pressure oil supply system.
Detailed Description
The invention will now be further described with reference to the accompanying drawings.
Example one
As shown in fig. 1 to 4, a common rail high-pressure oil inlet and outlet valve assembly comprises a plunger sleeve 1, wherein a plunger cavity 11, a connecting cavity and an oil inlet hole 13 are arranged on the plunger sleeve 1, and the connecting cavity is respectively communicated with the plunger cavity 11 and the oil inlet hole 13; the plunger 2 is inserted into the plunger cavity 11 in a sliding manner; the oil outlet joint 9 is hermetically arranged on the connecting cavity, and the oil outlet joint 9 is provided with a seventh oil duct 91; the plunger piston plunger valve further comprises an oil inlet valve seat 3, the oil inlet valve seat 3 is hermetically arranged in the connecting cavity and is hermetically connected with the plunger piston cavity 11, a first oil duct 33 and a second oil duct 31 communicated with the oil inlet hole 13 and the plunger piston cavity 11 are arranged on the oil inlet valve seat 3, and the first oil duct 33 is communicated with the plunger piston cavity 11; the oil inlet valve core 4 is arranged on the second oil duct 31, the oil inlet valve core 4 is tightly pressed on the second oil duct 31 to form a first sealing surface 42, and the first sealing surface 42 is used for opening and closing the second oil duct 31; the oil outlet valve seat 6 is hermetically arranged between the oil inlet valve seat 3 and the oil outlet joint 9, the oil outlet valve seat 6 is provided with a fourth oil duct 62, and the fourth oil duct 62 is respectively communicated with the first oil duct 33 and the seventh oil duct 91; and the oil outlet valve core 7 is arranged on the fourth oil channel 62, the oil outlet valve core 7 is pressed on the fourth oil channel 62 to form a second sealing surface 71, and the second sealing surface 71 is used for switching on and off the fourth oil channel 62.
The plunger sleeve 1 and the plunger 2 are matched into a plunger matching part.
The oil inlet valve seat 3 and the oil inlet valve core 4 form an oil inlet one-way valve, the oil outlet valve seat 6 and the oil outlet valve core 7 form an oil outlet one-way valve, when oil is fed, the plunger 2 descends, the first sealing surface 42 is opened, diesel oil enters the plunger cavity 11, the second sealing surface 71 is closed at the moment, when oil is discharged, the first sealing surface 42 is closed, the second sealing surface 71 is opened, and the diesel oil enters the seventh oil duct 91 and flows out.
The structure is greatly simplified through the oil inlet valve seat 3, the oil inlet valve core 4, the oil outlet valve seat 6 and the oil outlet valve core 7, so that the oil duct is reasonable in arrangement, the oil charging efficiency is high, the sealing performance is good, and the processing difficulty of parts is reduced.
Specifically, the plunger cavity 11 and the connecting cavity are coaxially arranged and communicated, the connecting cavity is located at the top of the plunger sleeve 1, and the plunger cavity 11 is located at the bottom of the plunger sleeve 1. The oil inlet hole 13 is provided in the side surface of the plunger barrel 1.
One end of the oil inlet valve core 4 is provided with a sealing head 41, and the sealing head 41 is pressed on the second oil duct 31 to form a first sealing surface 42.
An oil inlet cavity 12 is formed in the inner wall of the connecting cavity and/or the outer wall of the oil inlet valve seat 3, and the oil inlet cavity 12 is communicated with the oil inlet hole 13 and the second oil duct 31 respectively.
The oil inlet cavity 12 can reduce the assembly requirement, and the oil inlet hole 13 is conveniently communicated with the second oil duct 31.
The surface of the oil outlet valve seat 6 contacting the oil inlet valve seat 3 is provided with an oil outlet groove 61, and the oil outlet groove 61 is respectively communicated with the fourth oil channel 62 and the first oil channel 33.
The oil inlet valve further comprises an oil inlet spring 81, the oil inlet spring 81 is arranged in the second oil passage 31, the oil inlet spring 81 is used for tightly pressing the oil inlet valve core 4 on the second oil passage 31 to form a first sealing surface 42, the first sealing surface 42 is opened when the plunger cavity 11 is filled with oil, and the first sealing surface 42 is closed when the plunger cavity 11 is filled with oil.
The oil inlet spring 81 enables the oil inlet valve core 4 to be automatically pressed on the second oil duct 31 to form effective sealing, good sealing performance is guaranteed, meanwhile, the first sealing surface 42 is automatically sealed during oil outlet, and reliability of oil outlet is guaranteed.
The plunger piston oil-taking valve further comprises an oil-taking valve sleeve 5, the oil-taking valve sleeve 5 is hermetically arranged in a valve sleeve hole 32 of the oil-taking valve seat 3, a third oil duct 51 and a valve sleeve oil hole 52 which are mutually communicated are arranged on the oil-taking valve sleeve 5, the third oil duct 51 is communicated with the second oil duct 31, and the valve sleeve oil hole 52 is communicated with the plunger piston cavity 11; the oil inlet valve core 4 is slidably inserted into the valve sleeve oil hole 52, one end of the oil inlet valve core 4 is tightly pressed on the valve sleeve oil hole 52 to form a first sealing surface 42, and the oil inlet spring 81 is used for tightly pressing the oil inlet valve core 4 on the valve sleeve oil hole 52. The oil inlet valve sleeve 5 is fixed on the valve sleeve hole 32 through a fixing ring 86.
When the existing oil inlet valve enters the plunger cavity from the oil inlet cavity, the oil duct needs to turn 180 degrees to enter the plunger cavity, the oil filling efficiency is low, the dead volume at the upper end of the plunger is large, and the oil filling response speed is slow. The oil inlet cavity 12 is directly communicated with the plunger cavity 11 through the oil inlet valve sleeve 5, so that the oil filling efficiency is improved, the dead volume at the upper end of the plunger is reduced, and the oil filling response speed is high.
The other end of the oil inlet valve core 4 is provided with an oil inlet spring seat 82, an oil inlet spring 81 is movably inserted on the oil inlet valve core 4, and the oil inlet spring 81 is positioned between the oil inlet spring seat 82 and the oil inlet valve sleeve 5; the fixing mode between the oil inlet spring seat 82 and the oil inlet valve core 4 is one of bolt fixing, retainer ring fixing, interference fit fixing, thread fixing or welding fixing. The oil inlet spring seat 82 facilitates installation of the oil inlet spring 81, so that the oil inlet valve core 4 is automatically pressed on the oil inlet valve sleeve 5.
The surface of the oil outlet joint 9, which is in contact with the oil outlet valve seat 6, is provided with a fifth oil duct 92, and the fifth oil duct 92 is respectively communicated with the fourth oil duct 62 and the seventh oil duct 91; and the oil outlet spring 83 is further included, the oil outlet spring 83 is arranged in the fifth oil passage 92, and the oil outlet spring 83 is used for pressing the oil outlet valve spool 7 on the fourth oil passage 62 to form the second sealing surface 71. The oil outlet valve core 7 is automatically pressed on the oil outlet valve seat 6 through the oil outlet spring 83, and automatic sealing of the second sealing surface 71 is realized.
The oil outlet valve further comprises an oil outlet spring seat 84, the oil outlet spring seat 84 is installed in the fifth oil duct 92, a fixing column is arranged on the oil outlet spring seat 84, a sixth oil duct 85 is arranged on the fixing column, the sixth oil duct 85 is respectively communicated with the seventh oil duct 91 and the fifth oil duct 92, the oil outlet spring 83 is movably inserted into the fixing column, and the oil outlet spring 83 is located between the oil outlet valve core 7 and the oil outlet spring seat 84. The oil outlet spring seat 84 facilitates installation of the oil outlet spring 83, plays a role in positioning the oil outlet spring 83, enables the oil outlet spring 83 to keep a stable pressing direction, and ensures the sealing reliability of the second sealing surface 71.
The oil outlet valve core 7 can adopt a steel ball, the second sealing surface 71 adopts a conical surface, the sealing performance of the steel ball and the conical surface is good, the processing of the conical surface is convenient, and the steel ball is an existing mature product.
During operation, diesel oil enters the oil inlet cavity 12 from the oil inlet hole 13, the oil inlet cavity 12 is filled with low-pressure diesel oil, and the diesel oil reaches the upper end of the first sealing surface 42 through the second oil duct 31 and the third oil duct 51; as shown in fig. 2, when the plunger 2 moves downward, the volume in the plunger cavity 11 increases gradually, the pressure in the plunger cavity 11 decreases gradually and even forms a negative pressure, the diesel oil pressure at the upper end of the first sealing surface 42 overcomes the elastic force of the oil inlet spring 81, the oil inlet valve core 4 moves downward, the first sealing surface 42 is opened, the oil inlet cavity 12 is communicated with the plunger cavity 11, and the plunger cavity 11 starts to be filled with oil; when the plunger 2 moves upwards, the volume in the plunger cavity 11 is gradually reduced, the pressure in the plunger cavity 11 is gradually increased, the resultant force of the hydraulic pressure at the lower end of the oil inlet valve core 4 and the elastic force of the oil inlet spring 81 is greater than the hydraulic pressure at the upper end of the first sealing surface 42, the oil inlet valve core 4 moves upwards until the first sealing surface 42 is pressed tightly, the first sealing surface 42 is closed, and the oil inlet cavity 12 is not communicated with the plunger cavity 11; as shown in fig. 3, the pressure in the plunger cavity 11 continues to rise, the hydraulic pressure of the diesel oil is transmitted to the lower end of the oil outlet valve core 7 through the first oil passage 33 and the fourth oil passage 62, when the hydraulic pressure at the lower end of the oil outlet valve core 7 is greater than the resultant force of the elastic force of the oil outlet spring 83 and the hydraulic pressure on the oil outlet valve core 7, the oil outlet valve core 7 moves upwards, the second sealing surface 71 is opened, and the high-pressure diesel oil flows to the common rail pipe through the fifth oil passage 92, the sixth oil passage 85 and the seventh oil passage 91, so that the establishment and the delivery of high-pressure oil are realized; when the plunger 2 moves to the top dead center, the pressure oil movement is finished, the resultant force of the hydraulic pressure at the upper end of the oil outlet valve core 7 and the elastic force of the oil outlet spring 83 is larger than the hydraulic pressure at the lower end of the oil outlet valve core 7, the oil outlet valve core 7 moves downwards and is pressed on the second sealing surface 71, the second sealing surface 71 is closed, the fourth oil channel 62 is not communicated with the fifth oil channel 92, and the oil supply cycle is finished.
Example two
As shown in fig. 5, the common rail high pressure oil supply pump includes a common rail high pressure inlet and outlet valve assembly; an oil delivery pump 101; the cam device 106 is connected with a diesel engine gear train, and the cam device 106 is also respectively connected with the oil delivery pump 101 and the plunger 2 of the common rail high-pressure oil inlet and outlet valve assembly; the fuel metering valve 105, the fuel metering valve 105 is connected with the fuel delivery pump 101 and the oil inlet 13 respectively; the filter 102, the filter 102 is connected with the oil transfer pump 101; an oil tank 103, wherein the oil tank 103 is respectively connected with the oil transfer pump 101 and the filter 102; and a zero-fuel-supply throttle valve 104, the zero-fuel-supply throttle valve 104 being installed between the fuel metering valve 105 and the fuel inlet hole 13, the zero-fuel-supply throttle valve 104 being further connected to the fuel tank 103.
When the common rail high pressure fuel supply pump is started, the common rail high pressure fuel supply pump drives the fuel delivery pump 101 to rotate through the cam device 106, and the diesel oil is sucked out of the fuel tank 103 by the negative pressure generated by the fuel delivery pump 101 and flows to the fuel delivery pump 101 through the filter 102. After being pressurized by the fuel delivery pump 101, diesel oil flows to the fuel metering valve 105, a proportional oil inlet is formed in the fuel metering valve 105, the oil supply amount conveyed to the plunger and barrel assembly can be adjusted according to signals of the ECU, and the metered diesel oil flows to the oil inlet 13 of the common rail high-pressure inlet and outlet valve assembly through an internal oil duct of the fuel metering valve 105.
A zero oil supply throttle valve 104 is arranged between a fuel metering valve 105 and a plunger matching part on the common rail high-pressure oil supply pump, and when air exists in an oil channel, the air can be discharged through the zero oil supply throttle valve 104 to be prevented from entering the plunger cavity 11. When the diesel engine is shut down, the diesel oil in the pipeline flows back to the oil tank 103 through the zero fuel supply throttle valve 104.
The cam device 106 on the common rail high-pressure oil supply pump can drive the plunger 2 to move up and down, so that the oil filling and pressing processes of the plunger cavity 11 are realized, and meanwhile, the cam device 106 can drive the oil delivery pump 101. The cam device 106 is a conventional mature product and will not be described in detail.
The common rail high-pressure oil supply pump provided by the invention has high oil filling efficiency and good oil supply performance.
Claims (9)
1. A common rail high pressure oil inlet and outlet valve assembly comprises
The plunger piston comprises a plunger piston sleeve (1), wherein a plunger piston cavity (11), a connecting cavity and an oil inlet hole (13) are formed in the plunger piston sleeve (1), and the connecting cavity is respectively communicated with the plunger piston cavity (11) and the oil inlet hole (13);
a plunger (2), wherein the plunger (2) is inserted into the plunger cavity (11) in a sliding manner; and
the oil outlet joint (9), the oil outlet joint (9) is hermetically arranged on the connecting cavity, and a seventh oil duct (91) is arranged on the oil outlet joint (9);
it is characterized by also comprising
The oil inlet valve seat (3) is hermetically arranged in the connecting cavity and is hermetically connected with the plunger cavity (11), a first oil duct (33) and a second oil duct (31) communicated with the oil inlet hole (13) and the plunger cavity (11) are arranged on the oil inlet valve seat (3), and the first oil duct (33) is communicated with the plunger cavity (11);
the oil inlet valve core (4) is arranged on the second oil duct (31), the oil inlet valve core (4) is tightly pressed on the second oil duct (31) to form a first sealing surface (42), and the first sealing surface (42) is used for connecting and disconnecting the second oil duct (31);
the oil outlet valve seat (6) is hermetically arranged between the oil inlet valve seat (3) and the oil outlet joint (9), a fourth oil duct (62) is arranged on the oil outlet valve seat (6), and the fourth oil duct (62) is respectively communicated with the first oil duct (33) and the seventh oil duct (91); and
the oil outlet valve core (7) is arranged on the fourth oil channel (62), the oil outlet valve core (7) is pressed on the fourth oil channel (62) to form a second sealing surface (71), and the second sealing surface (71) is used for connection and disconnection of the fourth oil channel (62).
2. The common rail high pressure inlet and outlet valve assembly according to claim 1, wherein an oil inlet chamber (12) is formed on the inner wall of the connecting chamber and/or the outer wall of the oil inlet valve seat (3), and the oil inlet chamber (12) is respectively communicated with the oil inlet hole (13) and the second oil passage (31).
3. The common rail high-pressure oil inlet and outlet valve assembly according to claim 1, further comprising an oil inlet spring (81), wherein the oil inlet spring (81) is disposed in the second oil passage (31), the oil inlet spring (81) is used for pressing the oil inlet valve core (4) against the second oil passage (31) to form the first sealing surface (42), the first sealing surface (42) is opened when the plunger cavity (11) is filled with oil, and the first sealing surface (42) is closed when the plunger cavity (11) is filled with oil.
4. The common rail high pressure oil inlet and outlet valve assembly according to claim 3, further comprising an oil inlet valve sleeve (5), wherein the oil inlet valve sleeve (5) is hermetically installed in the valve sleeve hole (32) of the oil inlet valve seat (3), the oil inlet valve sleeve (5) is provided with a third oil passage (51) and a valve sleeve oil hole (52) which are communicated with each other, the third oil passage (51) is communicated with the second oil passage (31), and the valve sleeve oil hole (52) is communicated with the plunger cavity (11); the oil inlet valve core (4) is inserted in the valve sleeve oil hole (52) in a sliding mode, one end of the oil inlet valve core (4) is tightly pressed on the valve sleeve oil hole (52) to form the first sealing surface (42), and the oil inlet spring (81) is used for tightly pressing the oil inlet valve core (4) on the valve sleeve oil hole (52).
5. The common rail high-pressure oil inlet and outlet valve assembly according to claim 4, wherein an oil inlet spring seat (82) is arranged at the other end of the oil inlet valve core (4), the oil inlet spring (81) is movably inserted on the oil inlet valve core (4), and the oil inlet spring (81) is positioned between the oil inlet spring seat (82) and the oil inlet valve sleeve (5); the fixing mode between the oil inlet spring seat (82) and the oil inlet valve core (4) is one of bolt fixing, check ring fixing, interference fit fixing, thread fixing or welding fixing.
6. The common rail high pressure oil inlet and outlet valve assembly according to claim 1, wherein a fifth oil channel (92) is arranged on the surface of the oil outlet joint (9) contacting with the oil outlet valve seat (6), and the fifth oil channel (92) is respectively communicated with the fourth oil channel (62) and the seventh oil channel (91);
the oil outlet valve further comprises an oil outlet spring (83), the oil outlet spring (83) is arranged in the fifth oil channel (92), and the oil outlet spring (83) is used for pressing the oil outlet valve core (7) on the fourth oil channel (62) to form the second sealing surface (71).
7. A common rail high pressure inlet and outlet valve assembly as set forth in claim 6; the oil outlet valve is characterized by further comprising an oil outlet spring seat (84), the oil outlet spring seat (84) is installed in the fifth oil duct (92), a fixing column is arranged on the oil outlet spring seat (84), a sixth oil duct (85) is arranged on the fixing column, the sixth oil duct (85) is respectively communicated with the seventh oil duct (91) and the fifth oil duct (92), the oil outlet spring (83) is movably inserted into the fixing column, and the oil outlet spring (83) is located between the oil outlet valve core (7) and the oil outlet spring seat (84).
8. The common rail high pressure inlet and outlet valve assembly according to any one of claims 1 to 7, wherein said first sealing surface (42) is one of a conical seal, a flat seal or a spherical seal; the second sealing surface (71) is one of a conical seal, a planar seal or a spherical seal.
9. The common rail high-pressure oil supply pump is characterized by comprising
A common rail high pressure inlet and outlet valve assembly as set forth in claim 1;
an oil transfer pump (101);
the cam device (106) is connected with a diesel engine gear train, and the cam device (106) is also respectively connected with the oil transfer pump (101) and a plunger (2) of the common rail high-pressure oil inlet and outlet valve assembly;
the fuel metering valve (105), the said fuel metering valve (105) is connected with said fuel delivery pump (101) and said inlet port (13) separately;
a filter (102), wherein the filter (102) is connected with the oil transfer pump (101);
the oil tank (103), the said oil tank (103) and oil delivery pump (101) and filter (102) separately; and
the zero-fuel-supply throttling valve (104) is installed between the fuel metering valve (105) and the fuel inlet hole (13), and the zero-fuel-supply throttling valve (104) is further connected with the fuel tank (103).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113153593A (en) * | 2021-05-10 | 2021-07-23 | 无锡威孚马山油泵油嘴有限公司 | Non-road plunger and oil valve structure comprising same |
| CN113217244A (en) * | 2021-06-25 | 2021-08-06 | 龙口龙泵柴油喷射高科有限公司 | Positive pressure common rail oil supply pump assembly for light diesel engine |
| CN114278476A (en) * | 2022-01-07 | 2022-04-05 | 龙口龙泵柴油喷射高科有限公司 | High-pressure oil supply pump oil system assembly of large-flow electronic control common rail system |
| CN114776502A (en) * | 2022-04-29 | 2022-07-22 | 中国北方发动机研究所(天津) | Planar sealing type high-pressure common-rail variable pump oil inlet valve |
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2019
- 2019-11-27 CN CN201911182592.2A patent/CN110748446A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113153593A (en) * | 2021-05-10 | 2021-07-23 | 无锡威孚马山油泵油嘴有限公司 | Non-road plunger and oil valve structure comprising same |
| CN113153593B (en) * | 2021-05-10 | 2023-06-23 | 无锡威孚马山油泵油嘴有限公司 | Non-road plunger and oil valve structure comprising same |
| CN113217244A (en) * | 2021-06-25 | 2021-08-06 | 龙口龙泵柴油喷射高科有限公司 | Positive pressure common rail oil supply pump assembly for light diesel engine |
| CN114278476A (en) * | 2022-01-07 | 2022-04-05 | 龙口龙泵柴油喷射高科有限公司 | High-pressure oil supply pump oil system assembly of large-flow electronic control common rail system |
| CN114278476B (en) * | 2022-01-07 | 2023-12-01 | 龙口龙泵柴油喷射高科有限公司 | High-pressure oil supply pump oil system component of high-flow electric control common rail system |
| CN114776502A (en) * | 2022-04-29 | 2022-07-22 | 中国北方发动机研究所(天津) | Planar sealing type high-pressure common-rail variable pump oil inlet valve |
| CN114776502B (en) * | 2022-04-29 | 2023-07-18 | 中国北方发动机研究所(天津) | Plane sealing type oil inlet valve of high-pressure common rail variable pump |
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