CN114992026A - Flow limiting valve of medium-high speed diesel common rail machine for locomotive - Google Patents
Flow limiting valve of medium-high speed diesel common rail machine for locomotive Download PDFInfo
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- CN114992026A CN114992026A CN202210796883.6A CN202210796883A CN114992026A CN 114992026 A CN114992026 A CN 114992026A CN 202210796883 A CN202210796883 A CN 202210796883A CN 114992026 A CN114992026 A CN 114992026A
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- 230000003137 locomotive effect Effects 0.000 title claims abstract description 38
- 238000007789 sealing Methods 0.000 claims abstract description 127
- 230000001105 regulatory effect Effects 0.000 claims abstract description 21
- 230000003247 decreasing effect Effects 0.000 claims description 4
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- 239000002283 diesel fuel Substances 0.000 claims description 2
- 239000000446 fuel Substances 0.000 abstract description 7
- 238000002347 injection Methods 0.000 abstract description 7
- 239000007924 injection Substances 0.000 abstract description 7
- 230000002159 abnormal effect Effects 0.000 abstract description 3
- 238000004880 explosion Methods 0.000 abstract description 3
- 239000003921 oil Substances 0.000 description 65
- 239000000463 material Substances 0.000 description 4
- 239000000295 fuel oil Substances 0.000 description 2
- 206010033799 Paralysis Diseases 0.000 description 1
- 229910000746 Structural steel Inorganic materials 0.000 description 1
- 229910001315 Tool steel Inorganic materials 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 238000003763 carbonization Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
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Classifications
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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
- 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
- F02M63/0012—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
- 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
- F02M63/0012—Valves
- F02M63/007—Details not provided for in, or of interest apart from, the apparatus of the groups F02M63/0014 - F02M63/0059
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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
- F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
- F02M2200/16—Sealing of fuel injection apparatus not otherwise provided for
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/30—Use of alternative fuels, e.g. biofuels
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
The invention relates to a flow limiting valve of a medium-high speed diesel common rail machine for a locomotive, which comprises: the end cover and the oil outlet joint connected with the end cover are provided with a valve core, a pressure regulating spring and a sealing block between the end cover and the oil outlet joint. The middle-high speed diesel common rail machine flow limiting valve for the locomotive can be arranged between a common rail block and an oil injector through a high-pressure oil pipe, can cut off fuel supply of the oil injector when the high-pressure oil pipe leaks or the oil injector leaks and abnormal injection occurs, prevents the phenomenon of fire and explosion, ensures personnel safety, and improves the reliability and the safety of the middle-high speed diesel common rail machine flow limiting valve for the locomotive by reasonably arranging the structure of the middle-high speed diesel common rail machine flow limiting valve for the locomotive.
Description
Technical Field
The invention relates to a flow limiting valve, in particular to a flow limiting valve of a medium-high speed diesel common rail machine for a locomotive.
Background
With stricter emission regulations and increased energy crisis, the high pressure common rail system is increasingly used in the diesel fuel system. The high-pressure common rail system has the characteristics of high injection pressure, high response speed, flexible control and the like, and meets increasingly strict emission regulations and requirements of users on fuel economy and emission. The high pressure common rail system has strict requirements on reliability, safety and the like of parts, once the oil injector or oil pipe parts of the high pressure common rail system break down, the operation safety of the whole diesel engine can be seriously influenced, and even the diesel engine is directly paralyzed and can not operate. Therefore, reliability and safety of the high-pressure common rail system are important issues in designing the high-pressure common rail system.
Disclosure of Invention
The invention aims to provide a flow limiting valve of a medium-high speed diesel common rail machine for a locomotive, and aims to improve the reliability and safety of the flow limiting valve of the medium-high speed diesel common rail machine for the locomotive.
The invention relates to a flow limiting valve of a medium-high speed diesel common rail machine for a locomotive, which comprises:
the oil inlet structure comprises an end cover, wherein an oil inlet channel is arranged on the end cover, the opening at the upper end of the oil inlet channel is arranged into a first internal thread section, the opening at the lower end of the oil inlet channel is arranged into a second internal thread section, an inward convex annular flange part is arranged in the middle of the oil inlet channel, the annular flange part surrounds a channel section, a first sealing seat surface is arranged at the opening at the upper end of the channel section, and a second sealing seat surface is arranged at the opening at the lower end of the channel section;
the upper end part of the oil outlet joint is provided with a first external thread, the first external thread is matched with the second internal thread section so as to fixedly connect the upper end part of the oil outlet joint and the end cover together, a guide hole extending downwards from the upper end surface of the oil outlet joint and an oil outlet hole extending downwards from the bottom wall of the guide hole and penetrating through the oil outlet joint downwards are arranged in the oil outlet joint, and a third sealing seat surface is arranged at an upper end opening of the oil outlet hole;
the valve core comprises a large outer diameter section in sliding fit with the guide hole and a small outer diameter section connected to the lower side of the large outer diameter section, the outer diameter of the large outer diameter section is larger than that of the small outer diameter section, a cavity is formed between the small outer diameter section and the guide hole, a blind hole extending downwards from the upper end face of the valve core is arranged in the valve core, a throttling hole communicating the cavity with the blind hole is formed in the small outer diameter section, and a valve core sealing conical surface matched with the third sealing seat surface is arranged at the lower end of the valve core;
the pressure regulating spring is sleeved on the small outer diameter section, the lower end of the pressure regulating spring is supported on the bottom wall of the guide hole, and the upper end of the pressure regulating spring is upwards propped against the lower end face of the large outer diameter section;
the sealing block is arranged in the oil inlet channel, the upper portion of the sealing block is provided with a sealing block sealing spherical surface which is in contact with the second sealing seat surface to form sealing, the lower end face of the sealing block is a sealing plane, the upper end face of the valve core is provided with at least one circle of sealing ring belt protruding upwards, the sealing ring belt is in contact with the sealing plane to form sealing, the sealing block is provided with an axial through hole, an upper end opening of the axial through hole is communicated with a portion, located on the upstream of the sealing block, of the oil inlet channel, and a lower end opening of the axial through hole is connected with an upper end opening of the blind hole.
Optionally, a pressure regulating gasket is clamped between the upper end of the pressure regulating spring and the lower end face of the large outer diameter section.
Optionally, the first sealing seat face is the conical surface that the diameter reduces gradually from top to bottom, the second sealing seat face is the conical surface that the diameter gradually increases from top to bottom, the third sealing seat face is the conical surface that the diameter reduces gradually from top to bottom.
Optionally, the valve core sealing conical surface includes a first valve core sealing conical surface section and a second valve core sealing conical surface section located on the lower side of the first valve core sealing conical surface section, and the taper of the first valve core sealing conical surface section is smaller than the taper of the second valve core sealing conical surface section.
Optionally, a second external thread and a joint sealing spherical surface are arranged at the lower end of the oil outlet joint, and the second external thread is located on the upper side of the joint sealing spherical surface.
Optionally, an included angle between the central axis of the throttle hole and the central axis of the blind hole is 45 °, and the central axis of the throttle hole is inclined downward in a direction away from the central axis of the blind hole.
Optionally, chamfers are arranged at the upper end and the lower end of the outer circular surface of the large outer diameter section.
Optionally, the angle of the chamfer is 2 to 5 °.
Optionally, an oil return hole is formed in the annular flange portion, the upper end of the oil return hole upwards penetrates through the upper side face of the annular flange portion, and the lower end of the oil return hole downwards penetrates through the lower side face of the annular flange portion.
The middle-high speed diesel common rail machine flow limiting valve for the locomotive can be arranged between a common rail block and an oil injector through a high-pressure oil pipe, can cut off fuel supply of the oil injector when the high-pressure oil pipe leaks or the oil injector leaks and abnormal injection occurs, prevents the phenomenon of fire and explosion, ensures personnel safety, and improves the reliability and the safety of the middle-high speed diesel common rail machine flow limiting valve for the locomotive by reasonably arranging the structure of the middle-high speed diesel common rail machine flow limiting valve for the locomotive.
Drawings
FIG. 1 is a cross-sectional view of a flow limiting valve of a medium and high speed diesel common rail for a locomotive according to an embodiment;
fig. 2 is a partially enlarged view of fig. 1.
In the figure: 1-end cap; 2-sealing the block; 3-valve core; 4-pressure regulating gasket; 5-pressure regulating spring; 6-oil outlet joint;
101-a first internal thread segment; 102 — a first seal seat face; 103-a second seal seat surface; 104-a sealing block mounting section; 105 — a second internal thread segment; 106-oil return hole;
201-axial through hole; 202-sealing spherical surface by sealing block; 203-sealing plane;
301-large outer diameter section; 302-small outer diameter section; 303-blind hole; 304-orifice;
601-a pilot hole; 602 — third seat surface; 603, oil outlet holes; 604 — a first external thread; 605-sealing the annulus; 606 — second external thread; 607 — sealing the spherical surface with the joint.
Detailed Description
The invention will be further described with reference to the accompanying drawings.
The flow limiting valve of the medium-high speed diesel common rail machine for the locomotive shown in the figures 1 and 2 comprises an end cover 1, an oil outlet joint 6, a valve core 3, a pressure regulating spring 5 and a sealing block 2; an oil inlet channel is arranged on the end cover 1, an opening at the upper end of the oil inlet channel is provided with a first internal thread section 101, an opening at the lower end of the oil inlet channel is provided with a second internal thread section 105, an inward convex annular flange part is arranged in the middle of the oil inlet channel, the annular flange part surrounds a channel section, a first sealing seat surface 102 is arranged at an opening at the upper end of the channel section, and a second sealing seat surface 103 is arranged at an opening at the lower end of the channel section; the upper end part of the oil outlet joint 6 is provided with a first external thread 604, the first external thread 604 is matched with the second internal thread section 105 so as to fixedly connect the upper end part of the oil outlet joint 6 and the end cover 1 together, a guide hole 601 extending downwards from the upper end surface of the oil outlet joint 6 and an oil outlet hole 603 extending downwards from the bottom wall of the guide hole 601 and penetrating through the oil outlet joint 6 downwards are arranged in the oil outlet joint 6, and a third sealing seat surface 602 is arranged at the upper end opening of the oil outlet hole 603; the valve core 3 comprises a large outer diameter section 301 in sliding fit with the guide hole 601 and a small outer diameter section 302 connected to the lower side of the large outer diameter section 301, the outer diameter of the large outer diameter section 301 is larger than that of the small outer diameter section 302, a cavity is formed between the small outer diameter section 302 and the guide hole 601, a blind hole 303 extending downwards from the upper end face of the valve core 3 is arranged in the valve core 3, a throttling hole 304 communicating the cavity with the blind hole 303 is arranged on the small outer diameter section 302, and a valve core sealing conical surface matched with a third sealing seat surface 602 is arranged at the lower end part of the valve core 3; the pressure regulating spring 5 is sleeved on the small outer diameter section 302, the lower end of the pressure regulating spring 5 is supported on the bottom wall of the guide hole 601, and the upper end of the pressure regulating spring 5 upwards abuts against the lower end face of the large outer diameter section 301; the oil inlet channel comprises a sealing block mounting section 104, the sealing block mounting section 104 is arranged between the annular flange portion and the second internal thread section 105, the sealing block 2 is arranged in the sealing block mounting section 104, the upper portion of the sealing block 2 is provided with a sealing block sealing spherical surface 202 which is in contact with the second sealing seat surface 103 to form sealing, the lower end surface of the sealing block 2 is a sealing plane 203, the upper end surface of the valve core 3 is provided with at least one circle of sealing annular belt 605 which protrudes upwards, the sealing annular belt 605 is in contact with the sealing plane 203 to form sealing, the sealing block 2 is provided with an axial through hole 201, an upper end opening of the axial through hole 201 is communicated with a portion, located on the upstream of the sealing block 2, of the oil inlet channel, and a lower end opening of the axial through hole 201 is connected with an upper end opening of the blind hole 303.
By adopting the technical scheme, the first internal thread section 101 and the first sealing seat surface 102 are used for fastening and sealing the limiting valve of the medium-high speed diesel common rail machine for the locomotive and the high-pressure oil pipe, the limiting valve of the medium-high speed diesel common rail machine for the locomotive can be arranged between a common rail block and an oil injector through the high-pressure oil pipe, when the oil inlet pressure of the throttling hole 304 and the blind hole 303 exceeds the superposition value of the pressure in the cavity and the spring force of the pressure regulating spring 5, the valve core 3 moves downwards under the action of the oil inlet pressure, the sealing conical surface of the valve core is contacted with the third sealing seat surface 602 to block the fuel oil from entering the oil outlet 603, the fuel oil supply of the oil injector can be cut off when the high-pressure oil pipe leaks or the oil injector leaks and abnormal injection is carried out, the phenomenon of fire and explosion is prevented, and the safety of personnel is ensured;
the end cover 1 is arranged, so that the flow limiting valve of the medium-high speed diesel common rail machine for the locomotive forms a coating type design, the end cover 1 is directly connected with the oil outlet connector 6 through threads, and parts such as the sealing block 2, the valve core 3, the pressure regulating gasket 4, the pressure regulating spring 5 and the like are coated in the end cover, so that the flow limiting valve of the medium-high speed diesel common rail machine for the locomotive becomes a whole which is difficult to fall off, the packaging and the transportation of the flow limiting valve of the medium-high speed diesel common rail machine for the locomotive are facilitated, and the parts can be prevented from scattering;
the oil outlet joint 6 is an integrated body of a valve body and a high-pressure joint, so that the installation space and the number of parts of the flow limiting valve of the medium and high speed diesel common rail machine for the locomotive can be effectively reduced, and the reliability of the flow limiting valve of the medium and high speed diesel common rail machine for the locomotive is improved;
the sealing block 2 is a sealing block with a spherical surface, the sealing block sealing spherical surface 202 is matched with the second sealing seat surface 103, the self-adaptability is realized, when the verticality error exists between the oil outlet joint 6 and the end cover 1, the sealing block sealing spherical surface 202 and the second sealing seat surface 103 can automatically rotate for a certain angle, the stress on the sealing surfaces is balanced, the verticality requirement of matched parts can be reduced, and the sealing reliability of the flow limiting valve of the medium-high speed diesel common rail machine for the locomotive is improved; the sealing performance of the limiting valve of the medium-high speed diesel common rail machine for the locomotive is ensured by the matching of the second sealing seat surface 103 and the sealing block sealing spherical surface 202 in the limiting valve of the medium-high speed diesel common rail machine for the locomotive and the matching of the sealing plane 203 and the sealing ring band 605. Through setting up sealed clitellum 605, can guarantee sealed clitellum 605 and sealed plane 203 in close contact with through screwing up oil outlet connector 6, and sealed piece sealed sphere 202 also provides convenience for the close fit of sealed clitellum 605 and sealed plane 203, when oil outlet connector 6 upwards pushes up sealed piece 2, sealed piece 2 can slightly swing with better with sealed clitellum 605 matching, it is corresponding, the diameter of sealed piece erection segment 104 is greater than the external diameter of sealed piece 2, for sealed piece 2 rotates and the swing provides the space. Preferably, the sealing ring 605 has a smaller top and a larger bottom in cross section in order to form a better annular sealing line. In specific implementation, two sealing rings 605 may be disposed on the upper end surface of the oil outlet joint 6.
In some embodiments, the pressure adjusting gasket 4 is sandwiched between the upper end of the pressure adjusting spring 5 and the lower end surface of the large outer diameter section 301. The thickness of the pressure regulating gasket 4 can be matched and ground according to the opening pressure requirement of the flow limiting valve of the medium-high speed diesel common rail machine for the locomotive, the smooth opening of the flow limiting valve of the medium-high speed diesel common rail machine for the locomotive when the high-pressure common rail fuel injection system reaches a set pressure value can be ensured, and the safety of the high-pressure common rail fuel injection system is favorably improved.
In some embodiments, the first seal seat face 102 is a tapered face with a decreasing diameter from top to bottom, the second seal seat face is a tapered face with an increasing diameter from top to bottom, and the third seal seat face 602 is a tapered face with a decreasing diameter from top to bottom.
In some embodiments, the spool sealing taper comprises a first spool sealing taper section 305 and a second spool sealing taper section 306 on the underside of the first spool sealing taper section 305, the taper of the first spool sealing taper section 305 being less than the taper of the second spool sealing taper section 306. By adopting the scheme, the flow area between the second valve core sealing conical surface section 306 and the third sealing seat surface 602 is increased.
In some embodiments, the lower end of the oil outlet joint 6 is provided with a second external thread 606 and a joint sealing spherical surface 607, and the second external thread 606 is located on the upper side of the joint sealing spherical surface 607. The second external thread 606 and the joint sealing spherical surface 607 are used for fastening, linking and sealing with a flow limiting valve and an oil injector of a medium-high speed diesel common rail engine for a locomotive.
In some embodiments, the central axis of the orifice hole 304 is at a 45 ° angle to the central axis of the blind hole 303, and the central axis of the orifice hole 304 is disposed obliquely downward in a direction away from the central axis of the blind hole 303. The flow coefficient of the inclined hole is larger than that of the flat hole, so that the throttling loss can be reduced. Preferably, the valve body 3 is provided with a plurality of orifices 304.
In some embodiments, the upper and lower ends of the outer circular surface of the large outer diameter section 301 are each provided with a chamfer. Further, the angle of the chamfer is 2-5 degrees. By arranging the chamfer, a small-angle convergence wedge is formed when the valve core 3 is matched with the guide hole 601, the extrusion effect in dynamic pressure lubrication is enhanced, the thickness of an oil film on the surface of the valve core during operation is increased, the surface abrasion and the friction coefficient of the valve core are reduced, and the lubricating performance is improved.
In some embodiments, the annular flange portion is provided with oil return holes 106, the upper ends of the oil return holes 106 extend upward through the upper side surface of the annular flange portion, and the lower ends of the oil return holes 106 extend downward through the lower side surface of the annular flange portion. An oil return hole 106 is provided for collecting the fuel leaked from the joint of the second seal seat surface 103 and the seal block seal spherical surface 202 and the joint of the seal plane 203 and the seal ring band 605.
The flow limiting valve of the medium-high speed diesel common rail machine for the locomotive is used in a high-pressure common rail fuel injection system of the medium-high speed diesel engine for the locomotive, and a combustion medium of the flow limiting valve is diesel. In order to ensure the service life and the functional reliability of the flow limiting valve, the valve core 3 is made of high-speed tool steel materials, DLC is plated on a matching section, the oil outlet joint 6 is made of high-strength structural steel and is subjected to carbonization treatment, and the high-temperature resistance and the corrosion resistance of the flow limiting valve are ensured by adopting the materials and a heat treatment method.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example" or "some examples" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples described in this specification can be combined and combined by those skilled in the art.
Claims (9)
1. The utility model provides a middle and high speed diesel oil common rail machine current-limiting valve for locomotive which characterized in that includes:
the oil inlet structure comprises an end cover, wherein an oil inlet channel is arranged on the end cover, the opening at the upper end of the oil inlet channel is arranged into a first internal thread section, the opening at the lower end of the oil inlet channel is arranged into a second internal thread section, an inward convex annular flange part is arranged in the middle of the oil inlet channel, the annular flange part surrounds a channel section, a first sealing seat surface is arranged at the opening at the upper end of the channel section, and a second sealing seat surface is arranged at the opening at the lower end of the channel section;
the upper end part of the oil outlet joint is provided with a first external thread, the first external thread is matched with the second internal thread section so as to fixedly connect the upper end part of the oil outlet joint and the end cover together, a guide hole extending downwards from the upper end surface of the oil outlet joint and an oil outlet hole extending downwards from the bottom wall of the guide hole and penetrating through the oil outlet joint downwards are arranged in the oil outlet joint, and a third sealing seat surface is arranged at an upper end opening of the oil outlet hole;
the valve core comprises a large outer diameter section in sliding fit with the guide hole and a small outer diameter section connected to the lower side of the large outer diameter section, the outer diameter of the large outer diameter section is larger than that of the small outer diameter section, a cavity is formed between the small outer diameter section and the guide hole, a blind hole extending downwards from the upper end face of the valve core is arranged in the valve core, a throttling hole communicating the cavity with the blind hole is formed in the small outer diameter section, and a valve core sealing conical surface matched with the third sealing seat surface is arranged at the lower end of the valve core;
the pressure regulating spring is sleeved on the small outer diameter section, the lower end of the pressure regulating spring is supported on the bottom wall of the guide hole, and the upper end of the pressure regulating spring upwards abuts against the lower end face of the large outer diameter section;
the sealing block is arranged in the oil inlet channel, the upper portion of the sealing block is provided with a sealing block sealing spherical surface which is in contact with the second sealing seat surface to form sealing, the lower end face of the sealing block is a sealing plane, the upper end face of the valve core is provided with at least one circle of sealing ring belt protruding upwards, the sealing ring belt is in contact with the sealing plane to form sealing, the sealing block is provided with an axial through hole, an upper end opening of the axial through hole is communicated with a portion, located on the upstream of the sealing block, of the oil inlet channel, and a lower end opening of the axial through hole is connected with an upper end opening of the blind hole.
2. The medium and high speed diesel common rail engine flow limiting valve for locomotives according to claim 1, wherein a pressure regulating gasket 4 is clamped between the upper end of the pressure regulating spring and the lower end surface of the large outer diameter section.
3. The medium and high speed diesel common rail machine flow limiting valve for locomotives according to claim 1, wherein the first sealing seat surface is a tapered surface with a diameter gradually decreasing from top to bottom, the second sealing seat surface is a tapered surface with a diameter gradually increasing from top to bottom, and the third sealing seat surface is a tapered surface with a diameter gradually decreasing from top to bottom.
4. The valve of claim 1, wherein the spool sealing conical surface comprises a first spool sealing conical surface section and a second spool sealing conical surface section located on the lower side of the first spool sealing conical surface section, and the taper of the first spool sealing conical surface section is smaller than that of the second spool sealing conical surface section.
5. The medium and high speed diesel common rail engine restrictor valve for locomotives according to claim 1, wherein the lower end portion of the oil outlet joint is provided with a second external thread and a joint sealing spherical surface, and the second external thread is located on an upper side of the joint sealing spherical surface.
6. The medium and high speed diesel common rail engine flow limiting valve for locomotives according to claim 1, wherein an included angle between a central axis of the throttle hole and a central axis of the blind hole is 45 degrees, and the central axis of the throttle hole is arranged in a downward inclination manner along a direction far away from the central axis of the blind hole.
7. The medium and high speed diesel common rail engine flow limiting valve for locomotives according to claim 1, wherein an upper end and a lower end of an outer circular surface of the large outer diameter section are provided with chamfers.
8. The medium and high speed diesel common rail valve for locomotives according to claim 7, wherein the angle of the chamfer is 2 ° to 5 °.
9. The medium and high speed diesel common rail engine flow limiting valve for locomotives according to claim 1, wherein an oil return hole is provided on the annular flange portion, an upper end of the oil return hole penetrates upward through an upper side surface of the annular flange portion, and a lower end of the oil return hole penetrates downward through a lower side surface of the annular flange portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210796883.6A CN114992026B (en) | 2022-07-08 | 2022-07-08 | Flow limiting valve of medium-high speed diesel common rail machine for locomotive |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210796883.6A CN114992026B (en) | 2022-07-08 | 2022-07-08 | Flow limiting valve of medium-high speed diesel common rail machine for locomotive |
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| Publication Number | Publication Date |
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| CN114992026A true CN114992026A (en) | 2022-09-02 |
| CN114992026B CN114992026B (en) | 2024-02-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210796883.6A Active CN114992026B (en) | 2022-07-08 | 2022-07-08 | Flow limiting valve of medium-high speed diesel common rail machine for locomotive |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116857098A (en) * | 2023-07-03 | 2023-10-10 | 中国北方发动机研究所 | Filter flow limiting valve of common rail fuel injector |
| CN117404213A (en) * | 2023-11-29 | 2024-01-16 | 一汽解放汽车有限公司 | a gas injector |
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| DE112020000639T5 (en) * | 2019-09-26 | 2021-10-21 | Chongqing Hongjiang Machinery Co. Ltd. | Electronically controlled heavy oil common rail injector |
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2022
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| Publication number | Priority date | Publication date | Assignee | Title |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116857098A (en) * | 2023-07-03 | 2023-10-10 | 中国北方发动机研究所 | Filter flow limiting valve of common rail fuel injector |
| CN116857098B (en) * | 2023-07-03 | 2025-11-18 | 中国北方发动机研究所 | A common rail injector filter flow limiting valve |
| CN117404213A (en) * | 2023-11-29 | 2024-01-16 | 一汽解放汽车有限公司 | a gas injector |
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