CN107514328B - Micro-injection electric control fuel injector for dual-fuel engine - Google Patents
Micro-injection electric control fuel injector for dual-fuel engine Download PDFInfo
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- CN107514328B CN107514328B CN201710891671.5A CN201710891671A CN107514328B CN 107514328 B CN107514328 B CN 107514328B CN 201710891671 A CN201710891671 A CN 201710891671A CN 107514328 B CN107514328 B CN 107514328B
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- 239000000446 fuel Substances 0.000 title claims abstract description 108
- 238000000520 microinjection Methods 0.000 title claims abstract description 20
- 230000001105 regulatory effect Effects 0.000 claims description 26
- 238000007789 sealing Methods 0.000 claims description 25
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 5
- 230000001276 controlling effect Effects 0.000 claims description 3
- 238000002347 injection Methods 0.000 abstract description 9
- 239000007924 injection Substances 0.000 abstract description 9
- 238000009434 installation Methods 0.000 abstract description 4
- 239000003921 oil Substances 0.000 description 59
- 239000000295 fuel oil Substances 0.000 description 7
- 238000013461 design Methods 0.000 description 5
- 230000009977 dual effect Effects 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 244000186140 Asperula odorata Species 0.000 description 1
- 235000008526 Galium odoratum Nutrition 0.000 description 1
- 238000009825 accumulation Methods 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
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
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
- F02M43/00—Fuel-injection apparatus operating simultaneously on two or more fuels, or on a liquid fuel and another liquid, e.g. the other liquid being an anti-knock additive
- F02M43/04—Injectors peculiar thereto
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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
- F02M51/00—Fuel-injection apparatus characterised by being operated electrically
- F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
- F02M51/061—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means
- F02M51/0625—Injectors peculiar thereto with means directly operating the valve needle using electromagnetic operating means characterised by arrangement of mobile armatures
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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
- F02M63/0014—Valves characterised by the valve actuating means
- F02M63/0015—Valves characterised by the valve actuating means electrical, e.g. using solenoid
- F02M63/0017—Valves characterised by the valve actuating means electrical, e.g. using solenoid using electromagnetic operating means
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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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
The invention relates to a micro-injection electronic control fuel injector for a dual-fuel engine, which comprises: the upper section of the body is internally provided with an oil inlet, a first oil duct communicated with the oil inlet, a horizontal mounting hole and a second oil duct communicated with the horizontal mounting hole, and a guide sleeve is combined with the horizontal mounting hole and communicated with the second oil duct; the lower section of the body is internally provided with an oil inlet duct and a fuel cavity, and is connected with the lower end of the upper section of the body; a high-speed electromagnetic valve component is connected to the left side of the upper section of the body in a matching way; the right section of the control valve core of the high-speed electromagnetic valve member extends into the horizontal mounting hole of the upper section of the body and is matched with the horizontal mounting hole; a nozzle component is connected with the lower end of the lower section of the body; the hydraulic amplifying component comprises a metering orifice plate, a control sleeve and a control piston, wherein the metering orifice plate is arranged between the lower end of the lower section of the body and the upper end of the needle valve body, the control sleeve is arranged in the needle valve body, and the control piston is the upper end part of the needle valve. The invention can meet the installation requirements of limited radial size and loose axial size, and has small oil injection quantity and high stability.
Description
Technical Field
The invention relates to a dual-fuel engine, in particular to a micro-injection electric control fuel injector for injecting pilot fuel oil of the dual-fuel engine.
Background
Petroleum resource shortages and environmental pollution are exacerbated and conventional engines fuelled with petroleum are facing significant challenges. The dual-fuel engine using fuel oil and natural gas as fuel has the thermal efficiency equivalent to that of a diesel engine, so that the fuel cost is low, and the pollutant emission, especially PM, NOx, SOx, is effectively reduced. The development of micro-injection fuel systems for dual fuel engines to inject pilot fuel has become a necessary trend.
At present, the foreign companies such as sea chest, woodward, western harbor and the like break through the key technology of the fuel injection system of the dual-fuel engine and form a series of products. And the micro-injection ignition system of the domestic dual-fuel engine is provided by foreign companies in a whole set, and the price is high, so that the product lacks competitiveness. Therefore, the micro-injection fuel system for developing independent intellectual property rights of China can break the foreign technical blockade and promote the development of domestic dual-fuel engines.
Dual fuel engines typically have two sets of fuel injection systems, one set being the main fuel system, mainly operating in a pure diesel mode; the other set is a micro-injection pilot fuel system, which mainly works in a natural gas mode; the two sets of fuel oil system fuel oil injectors are simultaneously arranged on the cylinder cover, the cylinder cover is also provided with an air inlet passage, an air exhaust passage, other parts and the like, and in addition, the thickness of the cylinder cover of the marine diesel engine is large, so that the micro-injection fuel oil injector has the characteristics of small installation space, large height dimension and the like.
Compared with the traditional main fuel injector, the micro-injection fuel injector belongs to a typical slender structure, the radial size of the fuel injector is greatly limited, and the axial height is larger, so that parts of the fuel injector are more compact. In addition, since the amount of fuel required for ignition of a dual fuel engine is very small, the stability of the small amount of fuel is one of the important indicators of a micro-injection injector. Therefore, the stringent requirements of structural size and small oil mass stability have limited the development of micro-jet injectors.
Disclosure of Invention
The invention aims to provide a micro-injection electric control fuel injector for a dual-fuel engine, which has a slim and compact structure, can adapt to the installation requirements of limited radial size and loose axial size, and has small fuel injection quantity and high stability.
The invention relates to a micro-injection electric control fuel injector for a dual-fuel engine, which comprises the following components:
the upper section of the body is internally provided with an oil inlet and a first oil duct communicated with the oil inlet, the left part is internally provided with a horizontal mounting hole and a second oil duct communicated with the horizontal mounting hole, and a guide sleeve is in interference fit with the horizontal mounting hole and is communicated with the second oil duct;
the lower section of the body is internally provided with an oil inlet duct and a fuel cavity which are communicated up and down, and the lower section of the body is connected with the lower end of the upper section of the body through a body lock nut; the oil inlet oil duct is communicated with the first oil duct, and the fuel cavity is communicated with the second oil duct;
the high-speed electromagnetic valve component comprises a sleeve, an iron core matched with the inner wall of the sleeve, and a control valve core matched with the iron core at the left section, and is connected to the left side of the upper section of the body in a matched manner through an electromagnetic valve locking nut; the right section of the control valve core extends into the horizontal mounting hole at the left part of the upper section of the body and is matched with the guide sleeve;
the nozzle component comprises a needle valve body and a needle valve matched in the needle valve body, and is connected to the lower end of the lower section of the body in a matched manner through a nozzle locking nut;
the hydraulic amplifying component comprises a metering orifice plate, a control sleeve and a control piston, wherein the metering orifice plate is arranged between the lower end of the lower section of the body and the upper end of the needle valve body, the control sleeve is arranged in the needle valve body, the upper end of the control sleeve is flush with the needle valve body, and the control piston is the upper end part of the needle valve and is matched with the control sleeve in a matching way.
Further, an oil inlet measuring hole and an oil outlet measuring hole are formed in a measuring hole plate of the hydraulic amplifying component, and the control sleeve is connected with the measuring hole plate in a radial non-limiting mode; a control cavity is formed among the control sleeve, the metering orifice plate and the control piston, and a high-pressure volume cavity is formed among the needle valve body, the metering orifice plate and the control sleeve; the oil inlet duct of the lower section of the body is communicated with the oil inlet measuring hole on the measuring orifice plate, and the fuel cavity of the lower section of the body is communicated with the oil outlet measuring hole on the measuring orifice plate.
Further, an oil return groove is arranged at the right end of the guide sleeve on the upper section of the body, and a conical surface with a right conical angle is arranged at the left end of the guide sleeve; the right part of the right section of the control valve core is a balance piston, and the left part of the right section of the control valve core is provided with a conical surface with a right cone apex angle; the control valve core is matched with the guide sleeve, the conical surface on the control valve core is matched with the conical surface on the guide sleeve to form a sealing seat surface, the balance piston on the right section of the control valve core is matched with the inner surface of the guide sleeve to balance the hydraulic pressure born by the conical surface, and meanwhile the inner surface of the guide sleeve is used as a guide surface for controlling the valve core to reciprocate.
Further, the high-speed electromagnetic valve assembly further comprises a clamping ring which is positioned and connected to the left part of the middle section of the control valve core, a gasket, an electromagnetic valve spring and an adjusting gasket are sequentially matched with the left control valve core part of the clamping ring from left to right and extend into a central hole of the iron core, an armature, a supporting spring and a supporting disc are sequentially matched with the right control valve core part of the clamping ring from left to right, and the supporting disc is connected with the left end of the sleeve.
The nozzle assembly further comprises a pressure regulating spring and a pressure regulating gasket which are sequentially matched with the upper part of the needle valve from top to bottom; the needle valve is arranged in the middle hole of the needle valve body, and the conical surface at the lower end of the needle valve is matched with the conical surface at the lower end of the needle valve body to play a role in sealing; the upper end of the pressure regulating spring is tightly abutted with the lower end of the control sleeve, the lower end of the pressure regulating spring is tightly abutted with the pressure regulating gasket and is tightly abutted with a spring seat on the needle valve, and the pretightening force of the pressure regulating spring can be flexibly adjusted by adjusting the thickness of the pressure regulating gasket.
The invention has the advantages that:
(1) The lower section of the body is respectively in compression connection with the upper section of the body by adopting the body lock nut, and the lower section of the body is in compression connection with the metering orifice plate and the needle valve body by adopting the nozzle lock nut, so that the axial design size of the micro-injection fuel injector is enlarged, and the requirement of 'long' of the micro-injection fuel injector is met.
(2) The high-speed electromagnetic valve component adopts the upper horizontal arrangement mode, so that the radial design size of the oil sprayer can be reduced, and the requirement of small installation space of the micro-spray oil sprayer is met.
(3) The hydraulic balance piston is designed on the control valve core, the sealing diameter of the sealing seat surface can be flexibly adjusted according to the needs of the fuel injector, and the design difficulty of the electromagnetic valve and the electromagnetic valve spring is reduced.
(4) The lift limit of the armature of the high-speed electromagnetic valve is carried out through the boss on the lower end surface of the supporting disc, so that the direct collision between the armature and the iron core of the electromagnetic valve can be avoided, and the service life of the armature and the electromagnetic valve is prolonged.
(5) The hydraulic balance mechanism is adopted, so that the pressure index requirement of the micro-injection electric control fuel injector can be improved.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is an enlarged schematic upper view of the present invention;
fig. 3 is an enlarged schematic view of the lower part of the present invention.
In the figure: 1-an upper section of a body, 10-a guide sleeve, 11-a first oil duct, 12-a second oil duct and 13-a high-pressure oil joint;
2-lower section of body, 101-oil inlet duct, 102-fuel cavity;
3-a body lock nut;
4-a solenoid valve lock nut;
50-control valve core, 51-retainer ring, 52-iron core, 53-gasket, 54-solenoid valve spring, 55-adjusting gasket, 56-armature, 57-supporting spring, 58-supporting disk, 59-sleeve;
6-nozzle lock nuts;
71-a needle valve body, 72-a needle valve, 75-a pressure regulating spring and 76-a pressure regulating gasket;
81-a metering orifice plate, 82-a control sleeve;
103-oil outlet measuring hole, 104-oil inlet measuring hole, 105-control cavity and 106-high pressure volume cavity.
Detailed Description
The invention is described in detail below with reference to the attached drawing figures:
referring to fig. 1, 2 and 3, a micro-injection electronically controlled fuel injector for a dual fuel engine is shown, comprising: an oil inlet 13 and a first oil duct 11 communicated with the oil inlet are arranged in the right part of the upper section 1 of the body, a horizontal mounting hole and a second oil duct 12 communicated with the horizontal mounting hole are arranged in the left part of the upper section, and a guide sleeve 10 is in interference fit with the horizontal mounting hole and is communicated with the second oil duct;
the lower section 2 of the body is internally provided with an oil inlet channel 101 and a fuel cavity 102 which are communicated up and down, and the lower section of the body is connected with the lower end of the upper section 1 of the body through a body lock nut 3; the oil inlet channel 101 is communicated with the first oil channel 11, and the fuel cavity 102 is communicated with the second oil channel 12; the method is characterized in that:
the high-speed electromagnetic valve component comprises a sleeve 59, an iron core 50 matched with the inner wall of the sleeve, and a control valve core 51 matched with the iron core at the left section, and is connected to the left side of the upper section 1 of the body in a matched manner through an electromagnetic valve locking nut 4; the right section of the control valve core 51 extends into a horizontal mounting hole at the left part of the upper section 1 of the body and is matched with the guide sleeve 10;
a nozzle member comprising a needle valve body 71, a needle valve 72 fitted within the needle valve body, said nozzle member being cooperatively connected to the lower end of said body lower section 2 by a nozzle lock nut 6;
a hydraulic amplifying member includes a metering orifice 81, a control sleeve 82 and a control piston, the metering orifice is disposed between the lower end of the lower section 2 of the body and the upper end of the needle valve body 71, the control sleeve is disposed in the needle valve body and has an upper end flush with the needle valve body, and the control piston is an upper end portion of the needle valve 72 and is matched with the control sleeve 82 as a coupling member.
The lower end of the upper body section 1 is tightly pressed with the upper end sealing surface of the lower body section 2 through the body lock nut 3, two oil channels of the upper body section 1 are respectively communicated with the oil inlet channel 101 and the fuel cavity 102 of the lower body section 2, and the other end of the oil channel communicated with the fuel cavity 102 is communicated with the conical surface sealing cavity of the high-speed electromagnetic valve. The lower end of the lower section 2 of the body is connected with the orifice plate 81 and the needle valve body 71 and is tightly pressed by the nozzle lock nut 6, the oil inlet oil duct 101 of the lower section 2 of the body is communicated with the oil inlet orifice 104 on the orifice plate 81, and the fuel cavity 102 of the lower section 2 of the body is communicated with the oil outlet orifice 103 on the orifice plate 81.
The measuring hole plate 81 of the hydraulic amplifying component is provided with an oil inlet measuring hole 104 and an oil outlet measuring hole 103, and the control sleeve 82 is connected with the measuring hole plate in a radial non-limiting mode (namely, the control sleeve is correspondingly clung and limited in the axial direction and can freely move in a small area in the radial direction); a control cavity 105 is formed among the control sleeve 82, the orifice plate 81 and the control piston, and a high-pressure volume cavity 106 is formed among the needle valve body 71, the orifice plate 81 and the control sleeve 82; the oil inlet duct 101 of the lower section 2 of the body is communicated with the oil inlet measuring hole 104 on the measuring hole plate 81, and the fuel cavity 102 of the lower section 2 of the body is communicated with the oil outlet measuring hole 103 on the measuring hole plate 81.
High-pressure fuel in a common rail pipe (not shown in the figure and communicated with the oil inlet 13) enters the fuel injector through the oil inlet 13 of the upper section 1 of the body, flows into the oil inlet channel 101 through the first oil channel 11 and then flows to the lower end of the lower section 2 of the body, and the high-pressure fuel on the plane of the lower end of the lower section of the body is divided into two paths: part of fuel oil flows through the oil inlet measuring hole 104 of the measuring hole plate 81, enters the high-pressure volume cavity 106 and fills the volume cavity at the upper end of the needle valve sealing seat surface, thereby achieving the pressure accumulation effect; the other part of high-pressure fuel flows through the oil inlet measuring hole 104 of the measuring hole plate 81 and enters the control cavity 105, and simultaneously the fuel in the control cavity 105 enters the fuel cavity 102 through the oil outlet measuring hole 103, so that the fuel pressure in the control cavity 105, the high-pressure volume cavity 106 and the fuel cavity 102 is gradually built up to the rail pressure.
An oil return groove is formed in the right end of the guide sleeve 10 on the upper section 1 of the body, and a conical surface with a right conical angle is formed in the left end of the guide sleeve; the right part of the right section of the control valve core 51 is a balance piston, and the left part is provided with a conical surface with a right cone apex angle; the control valve core is matched with the guide sleeve 10, the conical surface on the control valve core is matched with the conical surface on the guide sleeve to form a sealing seat surface, the balance piston on the right section of the control valve core is matched with the inner surface of the guide sleeve 10 and used for balancing the hydraulic pressure born by the conical surface, and meanwhile the inner surface of the guide sleeve is used as a guide surface for controlling the valve core to reciprocate.
The high-speed electromagnetic valve assembly further comprises a clamping ring 52 which is positioned and connected to the left part of the middle section of the control valve core 51, a gasket 53, an electromagnetic valve spring 54 and an adjusting gasket 55 are sequentially matched with the left control valve core part of the clamping ring from left to right and extend into a central hole of the iron core 50, and an armature 56, a supporting spring 57 and a supporting disc 58 are sequentially matched with the right control valve core part of the clamping ring from left to right and are connected with the left end of the sleeve 59.
The sleeve 59 of the high speed solenoid valve assembly has opposite ends connected to the support disc 58 and the iron core 50, respectively, and the maximum air gap of the armature 56 can be flexibly adjusted by adjusting the height of the sleeve 59. The armature 56 has one end connected to a support spring 57 and the other end connected to the control valve core 51 via a collar 52. The solenoid valve spring 54 is installed in the middle hole of the iron core 50, one end of the solenoid valve spring 54 is supported to be a fixed end through the gasket 53, the other end of the solenoid valve spring 54 is connected with the control valve core 51 through the adjusting gasket 55, and the pretightening force of the solenoid valve spring 54 can be adjusted by adjusting the thickness of the adjusting gasket 55. The solenoid valve lock nut 4 presses the solenoid valve against the iron core 50, the sleeve 59, the support disc 58, etc. against the boss surface of the upper body section 1. The right end face of the supporting disc 58 is matched with the plane of the rear end of the conical surface of the control valve core 51, and the lift of the high-speed electromagnetic valve can be flexibly adjusted by adjusting the distance from the right end face of the supporting disc 58 to the boss face of the upper section 1 of the body, and the left end face of the supporting disc 58 and the concave plane respectively support the sleeve 59 and the supporting spring 57.
When the high-speed electromagnetic valve is not electrified, the sealing seat surface of the control valve core 51 is in a sealing state, the oil inlet channel 101, the fuel cavity 102, the high-pressure volume cavity 106 and the control cavity 105 of the lower section 2 of the body are filled with high-pressure fuel, and the conical surface of the control valve core 51 and the hydraulic pressure born by the balance piston are in a balanced state.
When the electromagnetic valve is electrified to generate electromagnetic force, the armature 56 is acted by the attractive force of the iron core 52, meanwhile, the stress of the control valve core 51 is changed, under the action of the electromagnetic force, the armature 56 drives the control valve core 51 to move leftwards, the sealing conical surface of the control valve core 51 is opened, and the electromagnetic valve is in an open state. The high-pressure fuel in the fuel chamber 102 flows out of the sealing cone, and the high-pressure fuel in the control chamber 105 flows out of the sealing cone through the fuel outlet 103 and the fuel chamber 102. The pressure of the fuel in the control chamber 105 is gradually reduced, the hydraulic pressure applied to the top of the needle valve 72 is reduced, the needle valve moves upwards and opens the sealing seat surface, the fuel in the high pressure volume chamber 106 is sprayed out from the spray hole, and the fuel injection process begins.
When the solenoid valve is de-energized, the control valve core 51 drives the armature 56 to move rightward under the combined action of the solenoid valve spring 54 and the fuel hydraulic pressure, and the sealing seat surface of the control valve core 51 is gradually sealed. The high-pressure fuel in the fuel inlet oil duct 101 continuously enters the control cavity 105 from the fuel inlet measuring hole 104 and enters the fuel cavity 102 through the fuel outlet measuring hole 103, when the fuel pressure in the control cavity 105 is higher than the needle valve closing pressure, the needle valve 72 moves downwards under the combined action of hydraulic pressure and the pressure regulating spring, the sealing seat surface is sealed, and the fuel injection process is finished.
The fuel in the control chamber 105, the fuel chamber 102 and the high-pressure volume chamber 106 continues to rise until the fuel pressure in the common rail is equal to the fuel pressure, and a second injection is prepared. The on-off time of the electromagnetic valve influences the start and stop time of the fuel injection of the fuel injector, and the energizing maintenance time of the electromagnetic valve determines the duration of the fuel injection process.
The nozzle assembly further includes a pressure regulating spring 75 and a pressure regulating washer 76 fitted in sequence from top to bottom on the upper portion of the needle valve 72; the needle valve 72 is arranged in the middle hole of the needle valve body 71, and the conical surface at the lower end of the needle valve is matched with the conical surface at the lower end of the needle valve body to play a role in sealing; the upper end of the pressure regulating spring 75 is tightly attached to the lower end of the control sleeve 82, the lower end of the pressure regulating spring is tightly attached to the pressure regulating gasket, and is tightly attached to a spring seat on the needle valve 72, and the pretightening force of the pressure regulating spring can be flexibly adjusted by adjusting the thickness of the pressure regulating gasket.
During processing, a section of the middle hole of the needle valve body 71 is matched with the needle valve 72 to serve as a guide surface for precision processing, so that the processing difficulty of the needle valve body 71 is reduced.
In the overall structure of the whole micro-injection fuel injector, the high-speed electromagnetic valve assembly adopts an overhead horizontal placement mode, which is obviously different from the traditional arrangement mode of the high-speed electromagnetic valve built-in fuel injector body, and a fuel cavity of the high-speed electromagnetic valve assembly is mutually communicated with a fuel cavity of the lower part of the fuel injector through the fuel cavity of the lower section of the body and other oil channels.
The high-speed electromagnetic valve is designed into a conical surface sealing structure, and a balance piston is designed for balancing the hydraulic pressure born by the sealing conical surface. Due to the hydraulic balance piston, the sealing conical surface can flexibly adjust the sealing diameter according to the fuel oil flow area of the fuel injector, and higher requirements on electromagnetic force and the electromagnetic valve spring 6 can not be generated, so that the design difficulty of the electromagnetic valve and the electromagnetic valve spring 6 is increased.
The lift limit of the armature of the high-speed electromagnetic valve adopts a displacement limiting control valve core, and the lift limit of the armature of the electromagnetic valve is carried out by mutual collision of a plane boss on the back surface of a cone valve of the control valve core and a boss on the lower end surface of a supporting disc.
The high-speed electromagnetic valve adopts an upper horizontal design, so that the radial size of the oil sprayer can be reduced, the limit of the axial size can be properly reduced, and the slender structural characteristics of the micro-spray oil sprayer of the dual-fuel engine are met; meanwhile, a hydraulic balance mechanism is adopted, so that the pressure index requirement of the micro-injection electric control fuel injector can be improved.
Working principle of the hydraulic balance mechanism: when the conical surface on the control valve core 51 and the conical surface on the guide sleeve 10 are matched with each other to form a sealing ring belt, the position of the sealing ring belt is the conical surface opening position of the guide sleeve 10, a closed fuel volume cavity 108 is formed between the annular groove of the control valve core 51 and the guide sleeve 10, the fuel in the fuel cavity 108 generates hydraulic pressure to the ring belt area at the left end of the annular groove of the control valve core 51, the balance piston at the right section of the control valve core 51 is matched with the inner surface of the guide sleeve 10, the fuel in the fuel cavity 108 simultaneously generates hydraulic pressure to the right to the ring belt area of the balance piston, the ring belt areas at the two ends of the control valve core 51 are equal, and the hydraulic pressure born by the control valve core 51 is balanced with each other. Because the fuel chamber 108 is filled with high-pressure fuel, the hydraulic pressure generated by the high-pressure fuel to the left annular area of the control valve core 51 is large, and the hydraulic pressure born by the control valve core 51 can be offset by adopting a hydraulic balance piston. Only electromagnetic force, spring force, etc. are considered in designing the valve element.
Claims (1)
1. A micro-injection electric control fuel injector for a dual-fuel engine comprises
An oil inlet (13) and a first oil duct (11) communicated with the oil inlet are arranged in the right part of the upper section (1) of the body, a horizontal mounting hole and a second oil duct (12) communicated with the horizontal mounting hole are arranged in the left part of the upper section, and a guide sleeve (10) is in interference fit with the horizontal mounting hole and is communicated with the second oil duct;
the lower section (2) of the body is internally provided with an oil inlet duct (101) and a fuel cavity (102) which are communicated up and down, and the lower section of the body is connected with the lower end of the upper section (1) of the body through a body lock nut (3); the oil inlet oil duct (101) is communicated with the first oil duct (11), and the fuel cavity (102) is communicated with the second oil duct (12); the method is characterized in that:
the high-speed electromagnetic valve component comprises a sleeve (59), an iron core (50) matched with the inner wall of the sleeve, and a control valve core (51) matched with the iron core at the left section, and is connected to the left side of the upper section (1) of the body in a matched manner through an electromagnetic valve locking nut (4); the right section of the control valve core (51) extends into a horizontal mounting hole at the left part of the upper section (1) of the body and is matched with the guide sleeve (10); the high-speed electromagnetic valve assembly further comprises a clamping ring (52) which is positioned and connected to the left part of the middle section of the control valve core (51), a gasket (53), an electromagnetic valve spring (54) and an adjusting gasket (55) are sequentially matched with the left control valve core part of the clamping ring from left to right and extend into a central hole of the iron core (50), an armature (56), a supporting spring (57) and a supporting disc (58) are sequentially matched with the right control valve core part of the clamping ring from left to right, and the supporting disc is connected with the left end of the sleeve (59);
a nozzle component comprises a needle valve body (71) and a needle valve (72) matched in the needle valve body, and the nozzle component is matched and connected with the lower end of the lower section (2) of the body through a nozzle lock nut (6);
the hydraulic amplifying component comprises a metering orifice plate (81), a control sleeve (82) and a control piston, wherein the metering orifice plate is arranged between the lower end of the lower section (2) of the body and the upper end of the needle valve body (71), the control sleeve is arranged in the needle valve body, the upper end of the control sleeve is flush with the needle valve body, and the control piston is the upper end part of the needle valve (72) and is matched with the control sleeve (82) by an even piece; the nozzle assembly further comprises a pressure regulating spring (75) and a pressure regulating gasket (76) which are sequentially matched with the upper part of the needle valve (72) from top to bottom; the needle valve (72) is arranged in a middle hole of the needle valve body (71), and the conical surface at the lower end of the needle valve is matched with the conical surface at the lower end of the needle valve body to play a role in sealing; the upper end of the pressure regulating spring (75) is tightly abutted against the lower end of the control sleeve (82), the lower end of the pressure regulating spring is tightly abutted against the pressure regulating gasket and is tightly abutted against a spring seat on the needle valve (72), and the pretightening force of the pressure regulating spring can be flexibly regulated by regulating the thickness of the pressure regulating gasket;
an oil inlet measuring hole (104) and an oil outlet measuring hole (103) are formed in a measuring hole plate (81) of the hydraulic amplifying component, and the control sleeve (82) is connected with the measuring hole plate in a radial non-limiting mode; a control cavity (105) is formed among the control sleeve (82), the orifice plate (81) and the control piston, and a high-pressure volume cavity (106) is formed among the needle valve body (71), the orifice plate (81) and the control sleeve (82); the oil inlet duct (101) of the lower section (2) of the body is communicated with the oil inlet measuring hole (104) on the measuring hole plate (81), and the fuel cavity (102) of the lower section (2) of the body is communicated with the oil outlet measuring hole (103) on the measuring hole plate (81);
an oil return groove is arranged at the right end of a guide sleeve (10) on the upper section (1) of the body, and a conical surface with a right conical angle is arranged at the left end of the guide sleeve; the right part of the right section of the control valve core (51) is a balance piston, and the left part is provided with a conical surface with a right cone apex angle; the control valve core is matched with the guide sleeve (10), the conical surface on the control valve core is matched with the conical surface on the guide sleeve to form a sealing seat surface, the balance piston on the right section of the control valve core is matched with the inner surface of the guide sleeve 10 to balance the hydraulic pressure born by the conical surface, and meanwhile the inner surface of the guide sleeve is used as a guide surface for controlling the valve core to reciprocate.
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| CN201710891671.5A CN107514328B (en) | 2017-09-27 | 2017-09-27 | Micro-injection electric control fuel injector for dual-fuel engine |
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| CN201710891671.5A CN107514328B (en) | 2017-09-27 | 2017-09-27 | Micro-injection electric control fuel injector for dual-fuel engine |
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| CN107514328B true CN107514328B (en) | 2023-12-08 |
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| JPH11190259A (en) * | 1997-09-25 | 1999-07-13 | Nippon Soken Inc | Fuel injection system |
| JPH11351100A (en) * | 1998-06-04 | 1999-12-21 | Denso Corp | Fuel injection nozzle |
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|---|---|
| CN107514328A (en) | 2017-12-26 |
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