CN210919309U - Combined common rail fuel injection pump cover - Google Patents
Combined common rail fuel injection pump cover Download PDFInfo
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- CN210919309U CN210919309U CN201921922224.2U CN201921922224U CN210919309U CN 210919309 U CN210919309 U CN 210919309U CN 201921922224 U CN201921922224 U CN 201921922224U CN 210919309 U CN210919309 U CN 210919309U
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- plunger sleeve
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Abstract
The utility model relates to a modular common rail injection pump cover to improve the effect of the installation leakproofness of plunger matching parts. This combination formula is rail injection pump cover includes: the pump cover body is used for being installed above the oil injection pump body and consists of a small cuboid and a large cuboid, wherein the small cuboid is located above the pump cover body, and the large cuboid is located below the pump cover body; a pressure storage cavity is arranged in the small cuboid, and the pressure storage cavity is arranged along the length direction of the small cuboid; an oil outlet port is arranged above the side surface of the small cuboid and communicated with the pressure storage cavity; the lower end face of the large rectangular body is provided with a plurality of plunger sleeve holes, the plunger sleeve holes are communicated to the pressure accumulation cavity through a high-pressure oil duct respectively, and internal threads used for being in threaded connection with the plunger sleeve are arranged in the plunger sleeve holes.
Description
Technical Field
The utility model relates to a marine low-speed machine high pressure common rail field specifically is a modular common rail injection pump cover.
Background
The electronic control common rail fuel system can realize accurate control of timing and circulating fuel injection quantity of fuel injection, and is one of effective means for realizing high fuel economy and low harmful substance emission of a high-power marine diesel engine. When the existing plunger matching part is assembled on an oil injection pump, the plunger sleeve is connected in a screw mode on the surface after the plunger matching part is assembled on a plunger sleeve hole formed in a pump body, and because the sealing surface of the pump body is in a special shape, a threaded hole is formed in the surface of the sealing surface of the pump body, the sealing reliability of high-temperature and high-pressure heavy oil is not facilitated, and the difficulty of machining the threaded hole in the pump body is high.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a modular common rail injection pump cover to improve the effect of the installation leakproofness of plunger matching parts.
The technical scheme of the utility model is that:
the utility model provides a modular common rail injection pump cover, include: the pump cover body is used for being installed above the oil injection pump body and consists of a small cuboid and a large cuboid, wherein the small cuboid is located above the pump cover body, and the large cuboid is located below the pump cover body;
a pressure storage cavity is arranged in the small cuboid, and the pressure storage cavity is arranged along the length direction of the small cuboid;
an oil outlet port is arranged above the side surface of the small cuboid and communicated with the pressure storage cavity;
the lower end face of the large rectangular body is provided with a plurality of plunger sleeve holes, the plunger sleeve holes are communicated to the pressure accumulation cavity through a high-pressure oil duct respectively, and internal threads used for being in threaded connection with the plunger sleeve are arranged in the plunger sleeve holes.
Preferably, a chamfer is arranged at an opening of the plunger sleeve hole on the lower end face of the large rectangular body;
the transition position of the bottom end surface and the hole wall of the plunger trepanning is set to be a round angle;
a groove is formed in the end face of the bottom of the plunger sleeve hole;
and a sealing ring belt used for forming a high-pressure sealing cavity with the oil inlet and outlet valve assembly is arranged at the bottom of the plunger sleeve hole.
Preferably, a mounting hole for mounting a proportional valve is arranged on the outer surface of the large rectangular body;
a first cooling oil path used for communicating the proportional valve is arranged in the large rectangular body, and the first cooling oil path is communicated to one plunger trepanning hole in the middle;
the lower surface of the large rectangular body is provided with a plurality of cooling oil inlet paths for communicating with a pump body of an oil injection pump, and the plurality of cooling oil inlet paths are respectively communicated to one plunger trepan hole positioned on the outer side;
a cooling oil return path for communicating a pump body of the fuel injection pump is formed in the lower surface of the large rectangular body and communicated to the proportional valve through a second cooling oil path arranged in the large rectangular body;
and two adjacent plunger sleeve holes are communicated through a third cooling oil path.
Preferably, a fuel inlet oil path communicated with the proportional valve is arranged on the outer surface of the large rectangular body, and the fuel inlet oil path is communicated to one plunger trepan boring in the middle;
and two adjacent plunger sleeve holes are communicated through a fuel oil circuit.
Preferably, two adjacent plunger sleeve holes are communicated through a first mixed oil passage;
a second mixed oil path communicated with the proportional valve is arranged on the outer surface of the large rectangular body and communicated to one plunger trepan hole in the middle;
and a mixed oil outlet communicated with one plunger sleeve hole positioned on the outer side is arranged on the outer surface of the large rectangular body.
Preferably, a threaded hole for installing the hanging ring is formed in the upper surface of the small cuboid.
Preferably, the upper surface of the large rectangular body is provided with a bolt mounting hole for being in threaded connection with the fuel injection pump body.
The utility model has the advantages that:
cuboid and pump body complex surface are the plane down, and the degree of difficulty of processing plunger trepanning on the cuboid is lower down, simultaneously, because the mounting means of plunger bushing and pump cover is through carrying out threaded connection in plunger trepanning inside, need not handle the lower surface of cuboid down, and cuboid and pump body complex surface still are the plane down, can ensure sealed effect of face.
Drawings
Fig. 1 is a schematic structural view of a pump cover of the present invention;
fig. 2 is one of schematic cross-sectional views of a pump cover according to the present invention;
fig. 3 is a partially enlarged schematic view of the plunger sleeve hole of the present invention;
fig. 4 is a second schematic cross-sectional view of the pump cover of the present invention;
fig. 5 is a schematic sectional view of the fuel injection pump of the present invention;
description of reference numerals: 1. a small cuboid; 2. a large cuboid; 3. mounting holes; 4. a boss; 5. mounting holes; 6. a second cooling oil passage; 7. a fuel inlet oil way; 8. a first cooling oil passage; 9. a second mixed oil path; 10. a bolt mounting hole; 11. a pressure storage chamber; 12. a groove; 13. round corners; 14. an internal thread; 15. a fuel oil path sealing screw; 16. a plunger trepan boring; 17. a cooling oil path sealing screw; 18. a cooling oil inlet path; 19. chamfering; 20. a fuel oil circuit; 21. a first mixed oil path; 22. a third cooling oil passage; 23. a mixed oil outlet; 24. an oil outlet interface; 25. a high pressure oil passage; 26. a threaded hole; 27. sealing the annulus; 28. a cooling oil return path; 29. a pump cover body; 30. an oil inlet and outlet valve assembly; 31. an oil outlet valve; 32. a plunger sleeve; 33. an oil inlet valve; 34. a plunger; 35. and a pump body.
Detailed Description
Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can 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 invention to those skilled in the art.
Referring to fig. 1 to 5, the utility model provides a modular common rail injection pump cover, include: the pump cover body 29 is used for being installed above the oil injection pump body, the pump cover body 29 is composed of a small cuboid 1 located above and a large cuboid 2 located below, the small cuboid 1 is connected with the large cuboid 2, and a large and small double-cuboid combined structure is adopted, so that the impact strength of the pump cover body 29 is guaranteed, the space is saved, and the weight of the pump cover body 29 is reduced; a pressure storage cavity 11 is arranged in the small cuboid 1, and the pressure storage cavity 11 is arranged along the length direction of the small cuboid 1; an oil outlet interface 24 is arranged above the side surface of the small cuboid 1, the oil outlet interface 24 is positioned in the center of the right side of the small cuboid 1 on the upper part of the pump cover body 29 and is horizontally arranged, the oil outlet interface 24 is communicated with the pressure accumulation cavity 11, and the pressure accumulation cavity 11 is used for accumulating high-pressure fuel oil; the pressure accumulation cavity 11 has a large and long aperture and can be used for stabilizing the oil outlet pressure fluctuation of the oil injection pump; a plurality of plunger sleeve holes 16 are formed in the lower end face of the large rectangular body 2, the plunger sleeve holes 16 are communicated with the pressure accumulation cavity 11 through a high-pressure oil duct 25, and internal threads 14 for being screwed with plunger sleeves 32 are arranged in the plunger sleeve holes 16.
Wherein, big cuboid 2 and little cuboid 1 integrated into one piece, the vertical height that highly is higher than little cuboid 1 of big cuboid 2.
In this embodiment, cuboid 1 and the pump body 35 complex surface are the plane down, and the degree of difficulty of processing plunger trepanning 16 is lower on cuboid 1 down, simultaneously, because plunger bushing 32 and pump cover body 29's mounting means is through carrying out threaded connection in plunger trepanning 16 is inside, need not handle cuboid 1's lower surface down, and cuboid 1 and the pump body 35 complex surface still are the plane down, can ensure sealed effect of face. Meanwhile, the internal threads 14 are arranged in the plunger sleeve hole 16 and are connected with the plunger sleeve 32, so that the connection strength of the plunger sleeve 32 and the pump cover body 29 is enhanced, meanwhile, the space is fully utilized, and the structure of the oil injection pump is more compact.
As shown in fig. 1, 2 and 3, a chamfer 19 is arranged at an opening of the plunger sleeve hole 16 on the lower end surface of the large rectangular body 2, and a fillet is arranged at the bottom of the plunger sleeve hole 16, so that the stress concentration phenomenon can be effectively prevented;
the transition position of the bottom end face and the hole wall of the plunger sleeve hole 16 is set to be a round angle 13, and a chamfer is arranged at the hole opening, so that the plunger sleeve 32 can be conveniently installed, and meanwhile, the phenomenon that the hole opening cuts a plunger sleeve sealing ring can be avoided.
The bottom end face of the plunger sleeve hole 16 is provided with a groove 12; the groove 12 is used for optimizing the structure of the pump cover body 29 and reducing the weight of the pump cover body 29.
The sealing ring belt 27 used for forming a high-pressure sealing cavity with the oil inlet and outlet valve assembly 30 is installed at the bottom of the plunger sleeve hole 16, the sealing ring belt 27 is arranged at the bottom of the plunger sleeve hole 16 and is in contact with the oil inlet and outlet valve assembly 30 to form the high-pressure sealing cavity, the contact surface requires high flatness and roughness, the groove 12 is formed to reduce the width of the sealing ring belt 27, the processing difficulty of the sealing ring belt 27 is reduced, the processing precision of the sealing ring belt 27 is improved, the requirement of high-pressure sealing is better met, and the shock resistance of the pump cover body 29 is improved.
Referring to fig. 2, a mounting hole 5 for mounting a proportional valve is provided on an outer surface of the large rectangular body 2;
a first cooling oil path 8 for communicating the proportional valve is arranged in the large rectangular body 2, and the first cooling oil path 8 is communicated with one plunger sleeve hole 16 in the middle;
a plurality of cooling oil inlet paths 18 for communicating with a pump body 35 of an injection pump are formed in the lower surface of the large rectangular body 2, and the plurality of cooling oil inlet paths 18 are respectively communicated to one plunger trepanning 16 positioned on the outer side;
a cooling oil return path 28 for communicating with a pump body 35 of the fuel injection pump is formed in the lower surface of the large rectangular body 2, and the cooling oil return path 28 is communicated to the proportional valve through a second cooling oil path 6 arranged in the large rectangular body 2;
the adjacent two plunger sleeve holes 16 are communicated through a third cooling oil path 22, and the joint of the third cooling oil path 22 and the end face of the pump cover body 29 is sealed in a screw and sealant mode, so that the sealing performance of the pump cover body 29 is ensured. Because the fuel oil flowing into the fuel injection pump through the proportional valve is heavy oil, the cooling oil flows through the second cooling oil line 6 and the first cooling oil line 8, so that the cooling oil circulates between the fuel injection pump and the proportional valve, and is used for cooling the proportional valve so as to meet the use environment of high-temperature high-viscosity heavy oil.
Specifically, the cooling oil flows in through the pump body 35 of the injection pump, flows into the plunger trepan 16 located on the outer side via the cooling oil inlet passage 18, flows into the plunger trepan 16 located at the intermediate position via the third cooling oil passage 22, then flows into the proportional valve through the first cooling oil passage 8 for cooling, and finally flows back to the pump body 35 of the injection pump through the second cooling oil passage 6 and the cooling oil return passage 28.
Preferably, a fuel inlet oil path 7 for communicating with the proportional valve is arranged on the outer surface of the large rectangular body 2, and the fuel inlet oil path 7 is communicated to one of the plunger sleeve holes 16 in the middle position.
And two adjacent plunger sleeve holes 16 are communicated through a fuel oil path 20. The joint of the fuel oil path 20 and the end face of the pump cover body 29 is sealed by screws and sealant to ensure the sealing performance of the pump cover body 29.
As shown in fig. 5, when the plunger 34 of the fuel injection pump moves downward, the fuel outlet valve 31 is closed, the fuel inlet valve 33 is opened, low-pressure fuel enters the plunger sleeve hole 16 at the middle position through the proportional valve via the fuel inlet oil path 7 in the boss 4 at the right side of the pump cover body 29, enters the plunger sleeve holes 16 at the left and right sides through the fuel oil path 20, and finally enters each plunger cavity through the oil holes on each plunger sleeve 32.
When the plunger 34 of the injection pump moves upward, the oil inlet valve 33 is closed, the oil outlet valve 31 is opened, and the high-pressure fuel in each plunger chamber enters the pressure accumulation chamber 11 of the pump cover body 29 through each high-pressure oil passage 25.
In the oil pumping process, the three plungers 34 pump oil to the pressure accumulation cavity 11 at different phases, the diameter of the pressure accumulation cavity 11 is large, the hole length is long, the volume is large, the pressure fluctuation of high-pressure fuel oil entering from each high-pressure oil passage 25 is effectively buffered, and the high-pressure fuel oil finally flows out through the high-pressure fuel oil outlet interface 24, so that the pressure of the high-pressure fuel oil output by the oil injection pump to a common rail pipe is more gentle, the consistency of the oil injection quantity of an oil injector is improved, and the performance of an oil injection system of a diesel engine is optimized.
Referring to fig. 1 and 2, two adjacent plunger sleeve holes 16 are communicated through a first mixed oil path 21;
a second mixed oil path 9 communicated with the proportional valve is arranged on the outer surface of the large rectangular body 2, and the second mixed oil path 9 is communicated to one plunger trepan 16 in the middle;
a mixed oil outlet communicated with one plunger trepan 16 positioned at the outer side is arranged on the outer surface of the large rectangular body 2. The mixed oil path is provided to discharge a small amount of fuel and cooling oil leaking in the plunger sleeve hole 16 and a small amount of fuel and cooling oil leaking through the proportional valve.
Referring to fig. 1 and 2, the upper surface of the small rectangular parallelepiped 1 is provided with a threaded hole 26 for installing a hanging ring, so that the high-pressure oil pump can be conveniently assembled and lifted, and the hole bottoms of the two threaded holes 26 for installing the hanging ring keep a certain distance from the high-pressure oil duct 25, so as to ensure the strength of the pump cover body 29.
Referring to fig. 1 and 2, bolt mounting holes 10 for screwing with a pump body 35 of an injection pump are formed in the upper surface of the large rectangular body 2, 4 bolt mounting holes 10 are uniformly arranged on the left side and the right side of the upper end face of the large rectangular body 2 on the lower portion of the pump cover body 29, and all the bolt mounting holes 10 are used for fixing the pump cover body 29 on the pump body 35 of the injection pump.
Referring to fig. 1, a boss 4 is arranged in the middle of the right end face of the large rectangular body 2 at the lower part of the pump cover body 29, the surface precision of the boss 4 is higher than that of the large rectangular body, and the arrangement of the boss 4 aims to ensure that the sealing precision of the matching surface of the proportional valve and the pump cover body 29 is higher, so that the sealing precision of the hole directly formed in the end face of the large rectangular body 2 is not high. The boss 4 is provided with a mounting hole 5 for mounting a proportional valve; wherein, fuel oil inlet circuit 7, second cooling oil circuit 6, first cooling oil circuit 8 and second miscella oil circuit 9 all set up on boss 4.
As shown in fig. 2, a cooling oil passage sealing screw 17 and a fuel oil passage sealing screw 15 are attached to the outer surface of the pump cover body 29, and these screws are provided to seal a process hole formed in the cylinder head, thereby preventing oil from leaking.
Although the invention has been described with respect to only some of its embodiments, those skilled in the art will appreciate that the invention can be embodied in many other forms without departing from the spirit or scope thereof. Accordingly, the present examples and embodiments are to be considered as illustrative and not restrictive, and various modifications and substitutions may be made thereto without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. A modular common rail injection pump cover includes: the pump cover body (29) is used for being mounted above a pump body of the oil injection pump, and is characterized in that the pump cover body (29) consists of a small cuboid (1) located above and a large cuboid (2) located below, and the small cuboid (1) is connected with the large cuboid (2);
a pressure storage cavity (11) is arranged in the small cuboid (1), and the pressure storage cavity (11) is arranged along the length direction of the small cuboid (1);
an oil outlet interface (24) is arranged above the side surface of the small cuboid (1), and the oil outlet interface (24) is communicated with the pressure accumulation cavity (11);
the lower end face of the large rectangular body (2) is provided with a plurality of plunger sleeve holes (16), the plunger sleeve holes (16) are communicated to the pressure storage cavity (11) through a high-pressure oil duct (25), and internal threads (14) used for being in threaded connection with a plunger sleeve (32) are arranged in the plunger sleeve holes (16).
2. The combined common rail injection pump cover of claim 1,
a chamfer (19) is arranged at an opening of the plunger sleeve hole (16) on the lower end face of the large rectangular body (2);
the transition part of the bottom end surface and the hole wall of the plunger trepanning (16) is provided with a fillet (13);
a groove (12) is formed in the end face of the bottom of the plunger sleeve hole (16);
and a sealing ring belt (27) for forming a high-pressure sealing cavity with the oil inlet and outlet valve assembly (30) is installed at the bottom position of the plunger sleeve hole (16).
3. The combined common rail injection pump cover of claim 1,
the outer surface of the large rectangular body (2) is provided with a mounting hole (5) for mounting a proportional valve;
a first cooling oil path (8) used for communicating the proportional valve is arranged in the large rectangular body (2), and the first cooling oil path (8) is communicated with one plunger sleeve hole (16) in the middle;
a plurality of cooling oil inlet paths (18) used for communicating a pump body of an oil injection pump are formed in the lower surface of the large rectangular body (2), and the plurality of cooling oil inlet paths (18) are respectively communicated with one plunger trepanning hole (16) located on the outer side;
a cooling oil return path (28) used for communicating a pump body of the oil injection pump is formed in the lower surface of the large rectangular body (2), and the cooling oil return path (28) is communicated to the proportional valve through a second cooling oil path (6) arranged in the large rectangular body (2);
and two adjacent plunger sleeve holes (16) are communicated through a third cooling oil path (22).
4. The combined common rail injection pump cover according to claim 3, wherein a fuel inlet passage (7) for communicating with the proportional valve is provided on the outer surface of the large rectangular body (2), the fuel inlet passage (7) communicating to one of the plunger trepanning holes (16) located at the intermediate position;
and two adjacent plunger sleeve holes (16) are communicated through a fuel oil path (20).
5. The combined common rail injection pump cover of claim 4,
two adjacent plunger sleeve holes (16) are communicated through a first mixed oil path (21);
a second mixed oil path (9) communicated with the proportional valve is arranged on the outer surface of the large rectangular body (2), and the second mixed oil path (9) is communicated to one plunger trepanning hole (16) in the middle;
and a mixed oil outlet (23) communicated with one plunger sleeve hole (16) positioned on the outer side is arranged on the outer surface of the large rectangular body (2).
6. The combined common rail fuel injection pump cover according to claim 1, wherein a threaded hole (26) for mounting a hanging ring is provided on an upper surface of the small rectangular parallelepiped (1).
7. The combined common rail fuel injection pump cover according to claim 1, wherein a bolt mounting hole (10) for screwing with the fuel injection pump body is provided on the upper surface of the large rectangular body (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921922224.2U CN210919309U (en) | 2019-11-08 | 2019-11-08 | Combined common rail fuel injection pump cover |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921922224.2U CN210919309U (en) | 2019-11-08 | 2019-11-08 | Combined common rail fuel injection pump cover |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210919309U true CN210919309U (en) | 2020-07-03 |
Family
ID=71346204
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921922224.2U Active CN210919309U (en) | 2019-11-08 | 2019-11-08 | Combined common rail fuel injection pump cover |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210919309U (en) |
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2019
- 2019-11-08 CN CN201921922224.2U patent/CN210919309U/en active Active
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