CN101435398B - Diesel fuel-injection apparatus with multiple safe protection devices - Google Patents
Diesel fuel-injection apparatus with multiple safe protection devices Download PDFInfo
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- CN101435398B CN101435398B CN2008102328871A CN200810232887A CN101435398B CN 101435398 B CN101435398 B CN 101435398B CN 2008102328871 A CN2008102328871 A CN 2008102328871A CN 200810232887 A CN200810232887 A CN 200810232887A CN 101435398 B CN101435398 B CN 101435398B
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- valve
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- fuel
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- 238000002347 injection Methods 0.000 title claims abstract description 53
- 239000007924 injection Substances 0.000 title claims abstract description 53
- 239000000446 fuel Substances 0.000 claims abstract description 33
- 229910000831 Steel Inorganic materials 0.000 claims description 12
- 238000007789 sealing Methods 0.000 claims description 12
- 239000010959 steel Substances 0.000 claims description 12
- 238000005336 cracking Methods 0.000 claims description 4
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 239000002828 fuel tank Substances 0.000 claims description 3
- 238000010791 quenching Methods 0.000 claims 2
- 229910000851 Alloy steel Inorganic materials 0.000 claims 1
- 229910001369 Brass Inorganic materials 0.000 claims 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims 1
- 239000010951 brass Substances 0.000 claims 1
- 238000005255 carburizing Methods 0.000 claims 1
- 238000005266 casting Methods 0.000 claims 1
- 239000000463 material Substances 0.000 claims 1
- 230000000171 quenching effect Effects 0.000 claims 1
- 239000003921 oil Substances 0.000 description 39
- 239000000295 fuel oil Substances 0.000 description 5
- 230000002159 abnormal effect Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 208000037656 Respiratory Sounds Diseases 0.000 description 2
- 208000002193 Pain Diseases 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
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- Fuel-Injection Apparatus (AREA)
Abstract
The invention provides a diesel engine fuel injection device with various safety protection devices. The diesel engine fuel injection device comprises an oil injection pump, a high-pressure oil pipe, an oil injector, a safety valve, a flow limit valve, a pneumatic high-pressure oil break device and a pneumatic stop device, etc., wherein the flow limit valve is arranged on the high-pressure oil pipe; the pneumatic high-pressure oil break valve is arranged on the oil outlet valve side of the oil injection pump to cut off a passage between the high-pressure oil of the oil outlet valve and the low-pressure oil inside the oil injection pump body; the safety valve is arranged inside any high-pressure zone between the oil injection pump and the oil injector; and an oil outlet end of the safety valve is connected with an oil tank. In conclusion, the invention takes possible faults of a diesel engine into consideration, and can adopt proper measures in time through the fuel system to enhance the safety of the fuel injection device.
Description
Technical field
The invention belongs to Diesel Engine Technique Field, be specifically related to a kind of diesel fuel-injection apparatus, mainly be applicable to modern unmanned engine room diesel engine peculiar to vessel with multiple safety protection device, or the diesel engine high to the diesel engine reliability requirement.
Background technique
The fuel injection apparatus of conventional diesel engine all is to adopt pump-pipe, mouth ejecting system then, and referring to Fig. 1, this system as faults such as Runaway of Diesel Engine, needle-valve body crackle take place, can not in time take measures under abnormal conditions, easily causes bigger accident.Along with diesel engine develops to intelligentized direction, increasing boats and ships adopt the unmanned engine room, for this reason, to diesel engine particularly the Security of fuel injection apparatus have higher requirement.
Summary of the invention
The present invention proposes a kind of diesel fuel-injection apparatus with multiple safety protection device in order to adapt to this demand, improves the Security of fuel injection apparatus.
In order to achieve the above object, the technical solution used in the present invention is as follows:
Fuel injection apparatus of the present invention comprises the element of common diesel fuel system, as Injection Pump, high-pressure oil pipe, oil sprayer etc., for improving the Security of oil-fired system, increasing design has safety valve, excess-flow valve, pneumatic high-voltage oil-break device and pneumatic stopping device etc.Excess-flow valve is installed on the high-pressure oil pipe, and the pneumatic high-voltage oil cut-off valve is installed in outlet valve one side of Injection Pump, blocks the high pressure oil of outlet valve and the path between the low pressure oil in the fuel injection pump housing; To any zone of high pressure between the oil sprayer safety valve is set at Injection Pump, the oil outlet end of safety valve connects fuel tank.
Described excess-flow valve comprises limiting valve, valve body and spring, and design has throttle orifice on the limiting valve, is communicated with the oilhole and the body cavity at limiting valve center, and the throttle orifice diameter is between φ 1mm～φ 4mm.The radial fit of limiting valve and valve body generally is designed to the gap of 0.01mm～0.03mm; The upper end pocketed springs of limiting valve is assemblied in the body cavity jointly, and limiting valve has certain stroke in valve body, and the upper end of limiting valve is tapered, cooperates with the conical surface nose end of oil outlet on the valve body.The major function of excess-flow valve is the lasting fuel injection event that prevents that oil sprayer from may occur.When crackle or the fracture of needle-valve body head dummy etc. appear in diesel engine cylinder high-pressure oil pipe generation explosion, oil injector body or pintle nozzle match-ing parts, cause high pressure fuel to flow to oil sprayer continuously, flow-limiting valve in this device can in time cut off the high pressure fuel of this cylinder at this moment, and the fault of avoiding breaking out of fire or other to influence diesel engine performance and reliability takes place.
Described pneumatic high-voltage oil-break device comprises piston, steel ball or cone structure sealing, the pressure adjusting spring in the mounting hole that is assemblied in Injection Pump outlet valve one side, and at the compression air flow channel that is communicated with this hole front end, the rigging screw of pressure adjusting spring rear end, front end is pressed in the ear end face of piston, the high-pressure oil duct of the front end of piston and Injection Pump outlet valve one side is by steel ball or cone structure sealing, and the front end of mounting hole also is communicated with the low-pressure cavity or the low-voltage fuel case of Injection Pump by oil duct.The major function of pneumatic high-voltage oil-break device be when the diesel engine single cylinder when breaking down, this cylinder oil-break can be quit work by it, and not influence other cylinder working.
Described safety valve is made up of Safety valve body, spool and spring, and conical surface seal or steel ball sealing mode are adopted in safe spool wherein and the sealing between the Safety valve body, and radial design is the Spielpassung of 0.01mm～0.02mm; The stroke of spool is designed to 0.2mm～1mm, and cracking pressure is set at 100MPa～200MPa.The major function of safety valve is after guaranteeing that oil sprayer breaks down, causing system pressure to raise during Runaway of Diesel Engine, the maximum pressure of restriction fuel injection system, overpressure when system, safety valve is opened pressure release, the maximum pressure of system is remained under the pressure of setting, avoid system to produce destruction because of overpressure.
In addition, at the injection pump rack end pneumatic stopping device are installed also, it comprises cylinder, connects swivel nut and air input joint, wherein adopt Spielpassung between cylinder and the tooth bar, seal up pressurized air, gap design is 0.015mm～0.05mm, and cylinder is connected with air input joint by connecting swivel nut, and compressed air inlet is arranged on the air input joint.The major function of pneumatic stopping device be diesel engine in case of emergency, stinging card as plunger causes under the situations such as the speed governing pull bar can't reset, Runaway of Diesel Engine, make injection pump rack back into zero fuel feeding position rapidly by pressurized air, the cutoff high fuel oil allows diesel engine stop rapidly.
In a word, the present invention has considered the fault that diesel engine may occur, and in time takes adequate measures by this oil-fired system, avoids accident to enlarge.
Description of drawings
Fig. 1 is that conventional oil-fired system is formed schematic representation;
Fig. 2 is a structural representation of the present invention;
Fig. 3 is the structural representation of safety valve wherein;
Fig. 4 is the structural representation of excess-flow valve wherein;
Fig. 5 is the structural representation of its mesohigh oil-break device;
Fig. 6 is the structural representation of pneumatic stopping device wherein.
Embodiment
Below in conjunction with description of drawings structure of the present invention and working method:
Referring to Fig. 2, the high-pressure oil pipe 2 that this diesel fuel-injection apparatus includes Injection Pump 1, oil sprayer 3 and is connected both, also comprise safety valve 6, excess-flow valve 4, pneumatic high-voltage oil-break device 5 and pneumatic stopping device 7 etc., excess-flow valve 4 is installed on high-pressure oil pipe 2, and pneumatic high-voltage oil-break device 5 is installed in outlet valve one side of Injection Pump 1, block the high pressure oil of outlet valve and the path between the low pressure oil in the fuel injection pump housing, to any zone of high pressure between the oil sprayer safety valve 6 is set at Injection Pump, the oil outlet end of safety valve 6 connects fuel tank.
Safety valve structure is adjusted pad 64 by Safety valve body 61, safe spool 62 and spring 63 and pressure and is formed as shown in Figure 3, and spring 63 is contained in the safe spool 62, and safe spool 62 is contained in the Safety valve body 61.Wherein safe spool and Safety valve body radial design are the Spielpassung of 0.01mm～0.02mm, and conical surface seal or steel ball sealing mode are adopted in the sealing between them; The stroke of safe spool is designed to 0.2mm～1mm, and cracking pressure is set at 100MPa～200Mpa.When fuel injection system breaks down as oil sprayer spray orifice obstruction etc., cause the high pressure of system to raise unusually, if be higher than the cracking pressure of safety valve, this moment, safety valve was opened, high pressure fuel flows back to the low pressure oil circuit by the oil circuit of design, and pressure is reduced, thus the normal operation of the system of assurance.Different oil-fired system peak injection pressure differences can be selected different openings pressure of safety valve by adjusting the pretightening force of spring.
The flow restriction valve arrangement as shown in Figure 4, comprise limiting valve 43, valve body 41 and spring 42, design has throttle orifice 44 on the limiting valve 43, and throttle orifice 44 diameters are between φ 1mm～φ 4mm, and the radial fit of limiting valve and valve body generally is designed to the gap of 0.01mm～0.03mm.The upper end pocketed springs 42 of flow-limiting valve 43, be assemblied in jointly in the inner chamber of valve body 41, the upper end of current limliting spool is tapered, cooperate with the conical surface nose end of oil outlet on the valve body, flow-limiting valve 43 has certain stroke in valve body 41, the design of its stroke determines that according to the oil-fired system fuel injection quantity relevant with the diameter of excess-flow valve, needs guarantee normal course of injection.Excess-flow valve design at Injection Pump to the high-pressure oil duct between the oil sprayer, the high pressure fuel that the flows to oil sprayer flow-limiting valve of need flowing through.Because the excess-flow valve design has throttle orifice, fuel oil reduces through the pressure behind the throttle orifice, because the pressure difference at throttle orifice two ends, limiting valve is pushed to oil outlet end, and along with flowing of fuel oil, limiting valve is constantly pushed oil outlet end to, under the normal condition, limiting valve is can not shift the sealed seat surface place onto.Under the abnormal conditions, fuel oil flows to the oil sprayer end continuously, and limiting valve just is pulled to the sealed seat surface place, seals up the fuel oil that flows to oil sprayer.
The structure of pneumatic high-voltage oil-break device as shown in Figure 5, comprise piston 55, steel ball 52, pressure adjusting spring 54 in the mounting hole that is assemblied in Injection Pump outlet valve one side, and the compression air flow channel 51 that is communicated with this hole front end, pressure adjusting spring 54 rear end rigging screws 53, front end is pressed in the ear end face of piston 55, the high-pressure oil duct 56 of the front end of piston 55 and Injection Pump outlet valve one side is by steel ball 52 sealings, and the front end of mounting hole also is communicated with the low-pressure cavity or the low-voltage fuel case of Injection Pump by oil duct 57.Under the normal condition, live high pressure fuel by valve or steel ball sealing.The high pressure fuel that comes out by pneumatic high-voltage oil-break device can directly flow back to the low-pressure cavity of Injection Pump, also can directly flow back to the low-voltage fuel case by the design specialized pipeline.Under the abnormal conditions, in the time of need be to indivedual cylinder fuel cut-off, connect pressurized air, pressurized air acts on the piston, promotes piston motion, and valve (or steel ball) is lifted, high pressure fuel and low-voltage fuel are connected, the high pressure fuel that flow to oil sprayer this moment just becomes low pressure oil, and low pressure oil can not be opened the fuel injector needle valve coupling, that is to say that high pressure fuel is cut off.
The structure of pneumatic stopping device as shown in Figure 6, be installed in injection pump rack 74 ends, comprise piston 71, cylinder 72, connect swivel nut 75 and air input joint 73, wherein adopt Spielpassung between cylinder 72 and the piston 71, seal up pressurized air, gap design is 0.015mm～0.05mm, and cylinder 72 is connected with air input joint 73 by screw thread, and compressed air inlet A is arranged on the air input joint 73.During urgency, connect pressurized air since between piston and the cylinder radially by good cooperating, seal up pressurized air, move to subtracting oily direction so this pressurized air promotes tooth bar by piston, until fuel cut-off.
Claims (4)
1. diesel fuel-injection apparatus with multiple safety protection device includes Injection Pump, oil sprayer and is connected both high-pressure oil pipe; It is characterized in that: excess-flow valve is installed on high-pressure oil pipe, and in outlet valve one side of Injection Pump the pneumatic high-voltage oil cut-off valve is installed, described pneumatic high-voltage oil cut-off valve blocks the high pressure oil of outlet valve and the path between the low pressure oil in the fuel injection pump housing; To any zone of high pressure between the oil sprayer safety valve is set at Injection Pump, the oil outlet end of safety valve connects fuel tank;
Described safety valve is made up of Safety valve body, safe spool and spring, and conical surface seal or steel ball sealing mode are adopted in safe spool wherein and the sealing between the Safety valve body, and radial design is the Spielpassung of 0.01mm～0.02mm; The stroke of safe spool is designed to 0.2mm～1mm, and cracking pressure is set at 100MPa～200Mpa;
Described excess-flow valve comprises limiting valve, valve body and spring, and design has throttle orifice on the limiting valve, is communicated with the oilhole and the body cavity at limiting valve center, and the throttle orifice diameter is between φ 1mm～φ 4mm; Wherein the radial fit of limiting valve and valve body is designed to the gap of 0.01mm～0.03mm; The upper end pocketed springs of limiting valve is assemblied in the body cavity jointly, and limiting valve has certain stroke in valve body, and the upper end of limiting valve is tapered, cooperates with the conical surface nose end of oil outlet on the valve body;
Described pneumatic high-voltage oil-break device comprises piston, steel ball or cone structure sealing, the pressure adjusting spring in the mounting hole that is assemblied in Injection Pump outlet valve one side, and the compression air flow channel that is communicated with this hole front end, the rigging screw of pressure adjusting spring rear end, front end is pressed in the ear end face of piston, the high-pressure oil duct of the front end of piston and Injection Pump outlet valve one side is by steel ball or cone structure sealing, and the front end of mounting hole also is communicated with the low-pressure cavity or the low-voltage fuel case of Injection Pump by oil duct.
2. a kind of diesel fuel-injection apparatus according to claim 1 with multiple safety protection device; it is characterized in that: the valve body of described Safety valve body and excess-flow valve all adopts low-alloy steel carburizing to quench limiting valve and all employing integral quenching of safe spool.
3. a kind of diesel fuel-injection apparatus according to claim 1 and 2 with multiple safety protection device; it is characterized in that: pneumatic stopping device also are installed at the injection pump rack end; it comprises piston, cylinder, connection swivel nut and air input joint; wherein adopt Spielpassung between cylinder and the piston; seal up pressurized air; gap design is 0.015mm～0.05mm, and cylinder is connected with air input joint by connecting swivel nut, and compressed air inlet is arranged on the air input joint.
4. a kind of diesel fuel-injection apparatus with multiple safety protection device according to claim 3 is characterized in that: the material selection brass or the Casting aluminium bronze of described cylinder, piston is selected alloyed steel for use.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102328871A CN101435398B (en) | 2008-10-17 | 2008-10-17 | Diesel fuel-injection apparatus with multiple safe protection devices |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102328871A CN101435398B (en) | 2008-10-17 | 2008-10-17 | Diesel fuel-injection apparatus with multiple safe protection devices |
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| Publication Number | Publication Date |
|---|---|
| CN101435398A CN101435398A (en) | 2009-05-20 |
| CN101435398B true CN101435398B (en) | 2010-12-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2008102328871A Expired - Fee Related CN101435398B (en) | 2008-10-17 | 2008-10-17 | Diesel fuel-injection apparatus with multiple safe protection devices |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103527377B (en) * | 2013-10-23 | 2015-10-07 | 重庆红江机械有限责任公司 | A kind of Multifunctional valve for common rail system |
| CN105888907A (en) * | 2016-06-03 | 2016-08-24 | 武汉理工大学 | Bypass one-way valve of double-fuel supply system of DME/diesel engine |
| CN112555474B (en) * | 2020-12-03 | 2023-05-16 | 重庆红江机械有限责任公司 | Mechanical lubricating oil control safety valve assembly |
| CN113446142A (en) * | 2021-08-09 | 2021-09-28 | 河南柴油机重工有限责任公司 | Engine cylinder deactivation device and method |
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| CN101435398A (en) | 2009-05-20 |
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Granted publication date: 20101201 |