CN115355120B - Dual fuel injector, engine and vehicle - Google Patents
Dual fuel injector, engine and vehicle Download PDFInfo
- Publication number
- CN115355120B CN115355120B CN202211081906.1A CN202211081906A CN115355120B CN 115355120 B CN115355120 B CN 115355120B CN 202211081906 A CN202211081906 A CN 202211081906A CN 115355120 B CN115355120 B CN 115355120B
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- Prior art keywords
- oil
- cavity
- communicated
- outer needle
- injector
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- 239000000446 fuel Substances 0.000 title claims abstract description 112
- 230000009977 dual effect Effects 0.000 title claims abstract description 49
- 239000007788 liquid Substances 0.000 claims abstract description 46
- 238000002347 injection Methods 0.000 claims abstract description 38
- 239000007924 injection Substances 0.000 claims abstract description 38
- 230000001105 regulatory effect Effects 0.000 claims abstract description 5
- 230000004308 accommodation Effects 0.000 claims description 17
- 238000005507 spraying Methods 0.000 claims description 9
- 230000009471 action Effects 0.000 claims description 8
- 238000004891 communication Methods 0.000 claims description 7
- 238000007789 sealing Methods 0.000 claims description 5
- 239000003921 oil Substances 0.000 abstract description 145
- 230000004044 response Effects 0.000 abstract description 14
- 238000002485 combustion reaction Methods 0.000 abstract description 13
- 238000000034 method Methods 0.000 abstract description 11
- 230000008569 process Effects 0.000 abstract description 11
- 239000000295 fuel oil Substances 0.000 abstract description 3
- 239000002737 fuel gas Substances 0.000 abstract description 2
- 239000013589 supplement Substances 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 13
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 239000007921 spray Substances 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 3
- 239000003345 natural gas Substances 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 239000002283 diesel fuel Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000036316 preload Effects 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 239000010720 hydraulic oil Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
Classifications
-
- 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
-
- 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)
- Fuel-Injection Apparatus (AREA)
Abstract
The application relates to a dual fuel injector, an engine and a vehicle, the dual fuel injector includes an injector body, an outer needle housing, an inner needle valve, and an adjustment assembly. Specifically, the adjusting component adjusts the liquid pressure in the sub-cavity so that the inner needle valve can axially move under the liquid pressure difference, and fuel oil is sprayed out of the fuel injection hole. The pressure in the control cavity is regulated by the regulating component in the air injection process, so that the outer needle shell moves axially, and fuel gas is injected from the air injection holes. The two-position three-way valve structure adopted by the application is different from a common two-position two-way valve, and when the electromagnetic valve is electrified and the armature acts, high-pressure fuel does not enter the control cavity any more, so that low-pressure fuel does not become to enter the oil return passage, and the utilization rate of the high-pressure fuel is improved. Meanwhile, high-pressure fuel does not supplement the control cavity, so that the pressure in the control cavity can be quickly reduced, the opening time of a needle valve is shortened, the response performance of the dual-fuel injector is improved, and the control of the combustion process of the dual-fuel engine is facilitated.
Description
Technical Field
The application relates to the technical field of vehicle internal combustion engines, in particular to a dual-fuel injector, an engine and a vehicle.
Background
A fuel injector is provided in a cylinder of an internal combustion engine, the fuel injector being arranged to provide controlled fuel delivery for combustion in the cylinder, the fuel injector being arranged to inject fuel directly or indirectly into a combustion chamber of the internal combustion engine or into an interconnected pre-chamber or combustion air conduit. The dual fuel injector may be integrally disposed in a conventional diesel injector mounting location for injecting fuel directly into a cylinder. Before compression top dead center, a trace amount of diesel oil is injected to serve as a pilot fuel, and then natural gas is injected into a combustion chamber to serve as main fuel to do work.
In the related art, a control valve for controlling fuel injection and air injection of a dual-fuel injector adopts a two-position two-way structure, and when the electromagnetic valve is electrified for fuel injection, high-pressure fuel still enters a control cavity and then turns into low-pressure return oil to flow out, so that high-pressure fuel is lost, and the efficiency of the engine is not improved. Meanwhile, in the valve opening process, high-pressure fuel is continuously supplemented into the control cavity, so that the pressure in the control cavity is reduced slowly, the needle valve is opened for a long time, and the response performance is not improved.
Disclosure of Invention
Based on the above, it is necessary to provide a dual fuel injector, an engine and a vehicle aiming at the problems that the current needle valve of the dual fuel injector has longer opening response time, and high pressure fuel enters a control cavity to be changed into low pressure return oil when a control valve is opened, so that high pressure fuel is lost, and the improvement of the efficiency of the engine is not facilitated.
An embodiment of the present application provides a dual fuel injector, comprising: an injector body having a first receiving cavity, a first end of the injector body having a first opening in communication with the first receiving cavity; the outer needle shell is arranged in the first accommodating cavity of the injector body, the first end of the outer needle shell is provided with an exposed part extending out of the first accommodating cavity and the first opening, and the exposed part is provided with an oil injection hole; the outer needle shell is provided with a second accommodating cavity extending along a first direction, and an oil outlet groove which is respectively communicated with the second accommodating cavity and the oil spraying hole is formed by surrounding one end of the outer needle shell, where the exposed part is arranged, and the exposed part; the inner needle valve is movably arranged in the second containing cavity along the first direction, and the first end of the inner needle valve is blocked at the notch of the oil outlet groove so as to block the second containing cavity and the oil injection hole; the inner needle valve is configured to divide the second accommodating chamber into a main chamber and a sub-chamber which are not communicated with each other, and the first liquid pressure in the main chamber and the second liquid pressure in the sub-chamber are equal when the electromagnetic valve is not energized; and a first adjusting assembly provided to the injector body and configured to be able to adjust the first liquid pressure so that the inner needle valve is able to move in the first direction under a pressure difference between the first liquid pressure and the second liquid pressure to communicate the second accommodation chamber and the oil injection hole through the notch of the oil discharge groove; wherein the first direction is parallel to an axial direction of the injector body.
In one embodiment, the injector body is provided with a third accommodating cavity which is arranged at intervals from the first accommodating cavity along the first direction, and the first adjusting component is arranged in the third accommodating cavity; the injector body is also provided with a first oil duct, a second oil duct and a third oil duct; the oil outlet end of the first oil duct is communicated with the main chamber, the oil outlet end of the second oil duct is communicated with the sub-chamber, and the oil outlet end of the third oil duct is communicated with the oil return duct; the oil inlet end of the first oil duct, the oil inlet end of the second oil duct and the oil inlet end of the third oil duct are all communicated with the third accommodating cavity; the first adjustment assembly is configured to enable the first oil passage to alternatively communicate with one of the second oil passage and the third oil passage by means of the third accommodation chamber to adjust the first liquid pressure.
In one embodiment, the first adjustment assembly includes a first armature assembly having a first state and a second state; in the first state, the first armature assembly is blocked at the oil inlet end of the third oil duct, so that the first oil duct is communicated with the second oil duct by means of the third accommodating cavity; in the second state, the first armature assembly is blocked at the oil inlet end of the second oil duct, so that the first oil duct is communicated with the third oil duct by means of the third accommodating cavity.
In one embodiment, the first adjustment assembly further comprises a first driver; the first driver is configured to drive the first armature assembly to move in the first direction to be in the second state.
In one embodiment, the inner needle valve further has a second end remote from the oil sump; the dual fuel injector also includes a first return spring coupled to the second end of the inner needle valve and the outer needle housing, respectively.
In one embodiment, a gas injection hole communicated with the first accommodating cavity is further formed in one side of the injector body, provided with the first opening; the outer needle shell is movably arranged in the first accommodating cavity along the first direction, the first end of the outer needle shell, where the exposed part is arranged, is blocked in the first opening to block the first accommodating cavity and the air injection hole, the outer needle shell is configured as a subchamber which can be communicated with the first accommodating cavity, the injector body is also provided with a control cavity communicated with the first accommodating cavity, and the gas pressure in the subchamber is equal to the third liquid pressure in the control cavity; and a second adjusting assembly provided to the injector body and configured to be able to adjust the third liquid pressure so that the outer needle housing is able to move in the first direction under a pressure difference between the gas pressure and the third liquid pressure to communicate the first accommodating chamber and the gas injection hole through the first opening.
In one embodiment, the injector body further has a second end distal from the first opening; the second end part of the ejector body is provided with a fourth accommodating cavity, and the second adjusting component is arranged in the fourth accommodating cavity; the ejector body is further provided with a fourth oil duct and a fifth oil duct, the oil outlet end of the fourth oil duct is communicated with the fourth accommodating cavity, the oil inlet end of the fourth oil duct is communicated with the control cavity, the oil inlet end of the fifth oil duct is communicated with the fourth accommodating cavity, and the oil outlet end of the fifth oil duct is communicated with the oil return channel; the second adjusting assembly is configured to control on-off between the fourth oil passage and the fifth oil passage by means of the fourth accommodation chamber to adjust the third liquid pressure.
In one embodiment, the dual fuel injector further includes a control disposed within the control chamber; the outer needle housing also has a second end remote from the exposed portion; one end of the control piece is connected to the second end of the outer needle shell, and under the action of axial force of the threads, the shoulder blade surface of the control piece is abutted against the end face of the second end of the outer needle shell to form a plane sealing pair for isolating the oil control cavity and the air control cavity, so that the pressure in the two cavities can be controlled independently. In one embodiment, the dual fuel injector further includes a detent key; the ejector body is provided with a first groove; the outer needle shell is provided with a second groove; the first groove and the second groove define a positioning hole matched with the positioning key.
In one embodiment, the locating hole and the locating key are in clearance fit.
An embodiment of the present application provides an engine including: a dual fuel injector as described above.
An embodiment of the present application provides a vehicle including: such as the engine described above.
A dual fuel injector, engine and vehicle includes an injector body, an outer needle housing, an inner needle valve, and an adjustment assembly. Specifically, the adjusting component adjusts the liquid pressure in the sub-cavity so that the inner needle valve can axially move under the liquid pressure difference, and fuel oil is sprayed out of the fuel injection hole. The pressure in the control cavity is regulated by the regulating component in the air injection process, so that the outer needle shell moves axially, and fuel gas is injected from the air injection holes. The two-position three-way valve structure adopted by the invention is different from a common two-position two-way valve, and when the electromagnetic valve is electrified and the armature acts, high-pressure fuel does not enter the control cavity any more, so that low-pressure fuel does not become to enter the oil return passage, and the utilization rate of the high-pressure fuel is improved. Meanwhile, high-pressure fuel does not supplement the control cavity, so that the pressure in the control cavity can be quickly reduced, the opening time of a needle valve is shortened, the response performance of the dual-fuel injector is improved, and the control of the combustion process of the dual-fuel engine is facilitated.
Drawings
FIG. 1 is a schematic diagram of a dual fuel injector according to one embodiment of the present application;
FIG. 2 is an enlarged partial view at A of a first state of a first armature assembly of the dual fuel injector shown in FIG. 1;
FIG. 3 is an enlarged partial view of a second state at A of a second state of the first armature assembly of the dual fuel injector shown in FIG. 1;
FIG. 4 is a schematic diagram of an injector body of a dual fuel injector according to another embodiment of the present application;
FIG. 5 is a schematic illustration of a portion of the dual fuel injector shown in FIG. 1;
fig. 6 is a cross-sectional view of a partial schematic of the dual fuel injector shown in fig. 5.
Detailed Description
In order that the above objects, features and advantages of the application will be readily understood, a more particular description of the application will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. The present application may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the application, whereby the application is not limited to the specific embodiments disclosed below.
In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present application, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present application, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.
As described in the background art, in the injection process of the current dual fuel injector, a valve for controlling fuel injection and air injection adopts a two-position two-way structure, and in the electrified fuel injection process of the electromagnetic valve, high-pressure fuel still enters a control cavity and then becomes low-pressure return oil to flow out, so that high-pressure fuel is lost, and the improvement of the efficiency of the engine is not facilitated. Meanwhile, in the valve opening process, high-pressure fuel is continuously supplemented into the control cavity, so that the pressure in the control cavity is reduced slowly, the needle valve is opened for a long time, and the response performance is not improved. Based on this, the inventors of the present application have conducted intensive studies to design a dual fuel injector, an engine and a vehicle to solve the above-mentioned problems.
Fig. 1 is a schematic diagram of a dual fuel injector according to an embodiment of the present application.
An embodiment of the present application provides a dual fuel injector, as shown in fig. 1, comprising an injector body 100, an outer needle housing 200, an inner needle valve 300, and a first adjustment assembly 400, the injector body 100 having a first receiving chamber, a first end 111 of the injector body being provided with a first opening in communication with the first receiving chamber. The outer needle housing 200 is provided in the first accommodation chamber of the injector body 100, and the first end 211 of the outer needle housing is provided with an exposed portion 212 extending out of the first accommodation chamber and the first opening, the exposed portion 212 is provided with an oil spray hole 213, and the outer needle housing 200 has a second accommodation chamber 214 extending in the first direction X. And an oil outlet groove 215 which is respectively communicated with the second accommodating cavity 214 and the oil spraying hole 213 is formed by surrounding one end of the outer needle housing 200 where the exposed part 212 is arranged and the exposed part 212, the inner needle valve 300 is movably arranged in the second accommodating cavity 214 along the first direction X, and the first end of the inner needle valve is blocked in a notch of the oil outlet groove 215 so as to block the second accommodating cavity 214 and the oil spraying hole 213.
The inner needle valve 300 is configured to partition the second accommodation chamber 214 into a main chamber 311 and a sub-chamber 312 that are not communicated with each other, and the first liquid pressure in the main chamber 311 and the second liquid pressure in the sub-chamber 312 are equal when the solenoid valve is not energized. The first adjustment assembly 400 is provided to the injector body 100 and is configured to be able to adjust the first liquid pressure so that the inner needle valve 300 is able to move in a first direction X parallel to the axial direction of the injector body 100 under a pressure difference between the first liquid pressure and the second liquid pressure to communicate the second accommodation chamber 214 and the oil injection hole 213 through the notch of the oil discharge groove 215.
It should be noted that the first adjusting assembly 400 adjusts the first liquid pressure in the main chamber 311 so that the inner needle valve 300 can move in the first direction X under the pressure difference between the first liquid pressure and the second liquid pressure to communicate the second accommodating chamber 214 and the oil spray hole 213 through the notch of the oil outlet groove 215. And then the fuel in the second accommodating cavity 214 flows into the fuel injection hole 213 through the oil outlet groove 215, the fuel is injected from the fuel injection hole, the response time of the whole inner needle valve 300 in the opening process is short, and the problem of long response time of the needle valve of the existing dual fuel injector is further solved.
In some embodiments, injector body 100 includes an injector upper body 11, an injector middle body 12, an injector lower body 13, a transition block 14, and a needle valve body 15. Specifically, the body tightening cap 16 is screwed with the injector lower body 13, and compresses the injector upper body 11, the injector middle body 12, and the injector lower body 13 with each other, and the nozzle tightening cap 16 is also screwed with the injector lower body 13, and compresses the transition block 14, the needle valve body 15, and the injector lower body 13 with each other.
In some embodiments, the inner needle valve 300 is coaxially embedded within the second accommodating chamber 214 along the first direction X, the inner needle valve 300 has a first axis L1, and the inner needle valve 300 is provided with a first annular groove 314 and a second annular groove 315 spaced apart along the first direction X. The first annular groove 314 is disposed around the first axis L1 to enclose the main chamber 311 between the groove wall of the first annular groove 314 and the chamber wall of the second accommodation chamber 214, and the second annular groove 315 is disposed around the first axis L1 to enclose the sub-chamber 312 between the groove wall of the second annular groove 315 and the second accommodation chamber 214.
In some embodiments, the injector body 100 is provided with a third accommodating cavity 113 arranged at intervals from the first accommodating cavity along the first direction X, the first adjusting assembly 400 is arranged in the third accommodating cavity 113, the injector body 100 is further provided with a first oil duct 114, a second oil duct 115 and a third oil duct 116, an oil outlet end of the first oil duct 114 is communicated with the main cavity 311, and an oil outlet end of the second oil duct 115 is communicated with the sub-cavity 312. The oil outlet end of the third oil passage 116 is communicated with the oil return passage, and the oil inlet end of the first oil passage 114, the oil inlet end of the second oil passage 115, and the oil inlet end of the third oil passage 116 are all communicated with the third accommodating chamber 113, and the first adjusting assembly 400 is configured to enable the first oil passage 114 to be alternatively communicated with one of the second oil passage 115 and the third oil passage 116 by means of the third accommodating chamber 113 so as to adjust the first liquid pressure.
As such, when the first adjustment assembly 400 communicates the first oil passage 114 with the second oil passage 115 by means of the third accommodation chamber 113, a part of the fuel flows into the sub-chamber 312 through the second oil passage 115, and another part of the fuel flows into the first oil passage 114 by means of the third accommodation chamber 113 and finally flows into the main chamber 311, so that the first liquid pressure in the main chamber 311 and the second liquid pressure in the sub-chamber 312 are equal. The first end 310 of the inner needle valve at this time blocks the notch of the oil outlet groove 215 to block the second accommodating cavity 214 and the oil spraying hole 213, and the fuel in the second accommodating cavity 214 cannot flow into the oil spraying hole 213 through the oil outlet groove 215, i.e. the fuel cannot be sprayed out from the oil spraying hole 213.
When the inner needle valve 300 needs to be opened to inject fuel, the first adjusting assembly 400 enables the first oil passage 114 to be communicated with the third oil passage 116 by means of the third accommodating cavity 113, and the fuel in the main chamber 311 finally flows out of the third oil passage 116 through the first oil passage 114 and the third accommodating cavity 113, so that the fuel is not continuously replenished, and the pressure of the internal combustion oil in the main chamber 311 is rapidly reduced. The first liquid pressure in the main chamber 311 is smaller than the second liquid pressure in the sub-chamber 312, so that a pressure difference is formed to generate an upward force, the inner needle valve 300 is lifted up under the force, the fuel is sprayed out from the fuel spraying hole 213 through the oil outlet groove 215 into the combustion chamber, and at this time, the opening time of the inner needle valve 300 is greatly shortened, and the response is greatly improved.
In particular to some embodiments, the first adjustment assembly 400 includes a first armature assembly 410, the first armature assembly 410 having a first state in which the first armature assembly 410 is enclosed at an oil inlet end of the third oil passage 116 such that the first oil passage 114 is in communication with the second oil passage 115 via the third receiving chamber 113, and a second state in which the first armature assembly 410 is enclosed at an oil inlet end of the second oil passage 115 such that the first oil passage 114 is in communication with the third oil passage 116 via the third receiving chamber 113.
Further, the first adjustment assembly 400 further includes a first driving member 411, the first driving member 411 being configured to drive the first armature assembly 140 to move in the first direction X to be in the second state. Specifically, the first driving member includes a first electromagnet.
Fig. 2 is a partial enlarged view of a first state a of the first armature assembly of the dual fuel injector shown in fig. 1, and fig. 3 is a partial enlarged view of a second state a of the second state of the first armature assembly of the dual fuel injector shown in fig. 1.
Still further, as shown in fig. 1-3, the first armature assembly 410 includes a first armature 412 and a first armature rod 413, the first armature 412 and the first armature rod 413 having an interference fit without relative movement, and the first adjustment assembly 400 further includes a second return spring 414 coupled to the first armature 412. In this way, the first armature assembly 410 moves linearly in the first direction X within the third housing chamber 113 under the attractive force of the first electromagnet and the spring preload of the second return spring 414. Specifically, when the first electromagnet is not energized, the first armature assembly 410 is at the bottom dead center position under the action of the pre-tightening force of the spring, the lower end face 4131 of the first armature pin contacts the upper end face 4132 of the lower body to form a sealing pair, the first armature pin 413 is blocked at the oil inlet end of the third oil duct 116, and the third oil duct 116 is blocked. When the first electromagnet is energized, the first armature assembly 410 moves upwards against the pretightening force of the spring under the action of electromagnetic force, the first armature rod conical surface 4133 and the middle body conical surface 4134 are contacted to form a sealing pair, the second oil duct 115 is isolated, and the first oil duct 114 and the third oil duct 116 are communicated.
It will be appreciated that the first armature assembly 410 closes the second oil passage 115 upon an upward lifting action. Different from a common two-position two-way valve, when the two-position three-way valve is opened, the oil inlet channel is closed, and fuel does not enter the main chamber 311 any more, so that dynamic oil return is reduced, hydraulic efficiency is improved, and the thermal efficiency of an engine is improved. Meanwhile, when the first armature assembly 410 is lifted, the fuel in the main chamber 311 is not replenished, so that the pressure in the main chamber 311 can be rapidly reduced, the lifting response time of the inner needle valve 300 is shortened, and the opening response performance of the injector is improved.
In some embodiments, the inner needle valve 300 also has a second end 313 remote from the oil sump 215 and the dual fuel injector further includes a first return spring 500 coupled to the second end 313 of the inner needle valve and the outer needle housing, respectively. As shown, the spring preload is provided by the first return spring 500 such that the first end 310 of the inner needle valve blocks the notch provided in the oil sump 215 to block the second receiving chamber 214 and the oil spray hole 213.
In some embodiments, the side of the injector body 100 where the first opening is provided is further provided with a gas injection hole 117 communicating with the first accommodating chamber, and the outer needle case 200 is movably provided in the first accommodating chamber along the first direction X, and the first end of the outer needle case 200 where the exposed portion 212 is provided is blocked at the first opening to block the first accommodating chamber and the gas injection hole 213. The outer needle housing 200 is configured as a subchamber 216 which can communicate with the first receiving chamber, and the injector body 100 is further provided with a control chamber 217 which communicates with the first receiving chamber, the gas pressure in the subchamber 216 being equal to the third liquid pressure in the control chamber 217 when the electromagnet is not energized. The second adjustment assembly 600 is provided to the injector body 100 and is configured to be able to adjust the third liquid pressure such that the outer needle housing 200 is able to move in the first direction X under the pressure difference between the gas pressure and the third liquid pressure to communicate the first accommodation chamber and the gas injection hole 117 through the first opening.
In particular to some embodiments, the outer needle housing 200 has a second axis L2 and the outer needle housing 200 has a third annular groove 219 disposed about the second axis L2 to enclose a subchamber 216 between a wall of the third annular groove 219 and a chamber wall of the first receiving chamber.
In some embodiments, the injector body 100 further has a second end 118 remote from the first opening, the second end 118 of the injector body is provided with a fourth receiving cavity 119, the second adjusting assembly 600 is disposed in the fourth receiving cavity 119, the injector body 100 is further provided with a fourth oil passage 120 and a fifth oil passage 121, and an oil outlet end of the fourth oil passage 120 communicates with the fourth receiving cavity 119. The oil inlet end of the fourth oil passage 120 is communicated with the control cavity 217, the oil inlet end of the fifth oil passage 121 is communicated with the fourth containing cavity 119, the oil outlet end of the fifth oil passage 121 is communicated with the oil return passage, and the second adjusting assembly 600 is configured to control on-off between the fourth oil passage 120 and the fifth oil passage 121 by means of the fourth containing cavity 119 so as to adjust the third liquid pressure.
Fig. 4 is a schematic structural diagram of an injector body of a dual fuel injector according to another embodiment of the present application.
In some embodiments, as shown in fig. 4, a first adjustment assembly 400 is used to control the third liquid pressure within the chamber 217 to control movement of the outer needle housing 200 in the first direction X to control the injection of gas. The second adjusting assembly 600 is used to control the first liquid pressure in the main chamber 311 to control the movement of the inner needle valve 300 in the first direction X, thereby controlling the injection of fuel, and the specific arrangement is not limited herein.
In some embodiments, the dual fuel injector further comprises a control member 700 disposed within the control chamber 217, the outer needle housing 200 further having a second end 218 remote from the exposed portion, one end of the control member 700 being threadably connected to the second end 218 of the outer needle housing, the shoulder blade surface of the control member 700 being in end-to-end abutment with the second end 218 of the outer needle housing under a threaded axial force to form a planar sealing pair for isolating the control chamber 311 from the control chamber 217 for independent control of pressure within the two chambers.
In particular to some embodiments, the control member 700 has a third axis L3, and the control member 700 has a fourth annular groove 710 disposed about the third axis L3 to enclose the control chamber 217 between a wall of the fourth annular groove 710 and a chamber wall of the first receiving chamber.
In order to facilitate understanding, the dual fuel injector provided in this embodiment is described with reference to a specific application scenario, the air injection process of the dual fuel injector is controlled by the electromagnet 610 and the air control valve assembly 620, when the electromagnet 610 is energized, the second armature 630 moves upwards against the pretightening force of the third return spring 640 under the attraction force of the electromagnet, and the fuel in the control chamber 217 flows out of the fifth oil duct 121 through the fourth accommodating chamber 119, and it is to be noted that, since the aperture of the oil outlet 122 is larger than that of the oil inlet 123, the fuel flowing out of the control chamber 217 is more than the incoming fuel, so that the pressure of the control chamber 217 is reduced. When the pressure is reduced to a certain set value, the outer needle shell 200 is lifted upwards under the action of gas in the subchamber 216 against the pre-tightening force of the fourth return spring 800, and the gas is sprayed into the combustion chamber of the engine through the gas spraying holes 117. At this time, a small amount of compression ignition diesel oil injected into the combustion chamber rapidly ignites a large amount of injected natural gas, and the natural gas burns to push the piston to move downwards to finish acting. When the electromagnet 610 is powered off, the electromagnet 610 moves downwards under the pretightening force of the third reset spring 640, so that the oil outlet end of the fourth oil duct 120 is closed, the fuel in the control cavity 217 is not discharged, the pressure in the cavity is gradually increased, when the pressure in the control cavity 217 is increased to a certain value, the outer needle shell 200 moves downwards under the action of hydraulic oil and the action of the fourth reset spring 800 against the fuel pressure, and when the conical surface of the outer needle shell 200 contacts with the injector body 100, the air injection hole 117 is closed, and the air injection process is ended.
Fig. 5 is a schematic view of a portion of the dual fuel injector shown in fig. 1, and fig. 6 is a cross-sectional view of a portion of the schematic view of the dual fuel injector shown in fig. 5.
In some embodiments, as shown in fig. 1,5 and 6, the dual fuel injector further includes a detent 900, a first recess (not shown) is provided on the needle valve body 15, a second recess (not shown) is provided on the outer needle housing 200, and the first recess and the second recess define a detent hole (not shown) that mates with the detent 900, and in particular, in some embodiments, the detent hole and the detent 900 are in a clearance fit.
In this way, the positioning key 900 ensures the circumferential angular positioning of the needle valve body 15 and the outer needle housing 200, the positioning key 900 is in clearance fit with the positioning hole, the axial movement of the needle valve body 15 and the outer needle housing 200 is not affected, and fuel oil flows from the needle valve body 15 into the main chamber 311 and the sub-chamber 312 of the inner needle valve 300 to flow through the outer needle housing 200. In order to ensure that the outer needle housing 200 is stressed uniformly and avoid the eccentric wear phenomenon, the first oil passage 114 of the needle valve body 15 and the upper oil passage 323 of the outer needle housing 200 are circumferentially arranged at 180 degrees, and the second oil passage 115 of the needle valve body 15 and the lower oil passage 325 of the outer needle housing 200 are also circumferentially arranged at 180 degrees, so that after the fuel flows out of the needle valve body 15, the fuel passes through the upper annular groove 332 and the lower annular groove 324 of the outer needle housing 200, and enters the second accommodating cavity 214 inside the outer needle housing 200 from the upper oil passage 323 and the lower oil passage 325 of the outer needle housing 200 in opposite 180 degrees directions.
An embodiment of the present application provides an engine comprising a dual fuel injector as described above, comprising an injector body 100, an outer needle housing 200, an inner needle valve 300, and a first adjustment assembly 400. Specifically, the first adjustment assembly 400 adjusts the first liquid pressure in the main chamber 311 to enable the inner needle valve 300 to move in the first direction X under the pressure difference between the first liquid pressure and the second liquid pressure to communicate the second accommodation chamber 214 and the oil spray hole 213 through the notch of the oil discharge groove 215. And then the fuel in the second accommodation cavity 214 flows into the fuel injection hole 213 through the oil outlet groove 215, the fuel is injected from the fuel injection hole 213, the response time of the whole inner needle valve 300 in the opening process is short, and the problem that the power of the engine is lost due to the long opening response time of the needle valve in the existing injector is solved.
An embodiment of the present application provides a vehicle, including an engine as described above, where the engine includes a dual fuel injector in the above embodiment, and the response time of the opening process of the entire inner needle valve 300 of the dual fuel injector is short, so as to improve the problem that the power of the engine is lost due to the long opening response time of the needle valve in the existing injector.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the claims. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.
Claims (12)
1. A dual fuel injector, comprising:
an injector body having a first receiving cavity, a first end of the injector body having a first opening in communication with the first receiving cavity;
The outer needle shell is arranged in the first accommodating cavity of the injector body, the first end of the outer needle shell is provided with an exposed part extending out of the first accommodating cavity and the first opening, and the exposed part is provided with an oil injection hole; the outer needle shell is provided with a second accommodating cavity extending along a first direction, and an oil outlet groove which is respectively communicated with the second accommodating cavity and the oil spraying hole is formed by surrounding one end of the outer needle shell, where the exposed part is arranged, and the exposed part;
The inner needle valve is movably arranged in the second containing cavity along the first direction, and the first end of the inner needle valve is blocked at the notch of the oil outlet groove so as to block the second containing cavity and the oil injection hole; the inner needle valve is configured to divide the second accommodating chamber into a main chamber and a sub-chamber which are not communicated with each other, and when the electromagnetic valve is not energized, the first liquid pressure in the main chamber and the second liquid pressure in the sub-chamber are equal; and
A first adjusting assembly provided to the injector body and configured to be able to adjust the first liquid pressure so that the inner needle valve is able to move in the first direction under a pressure difference between the first liquid pressure and the second liquid pressure to communicate the second accommodating chamber and the oil injection hole through a notch of the oil discharge groove; the first adjustment assembly includes a first armature assembly and a first driver;
Wherein the first direction is parallel to an axial direction of the injector body.
2. The dual fuel injector of claim 1, wherein the injector body is provided with a third receiving cavity spaced from the first receiving cavity along the first direction, the first adjustment assembly being disposed within the third receiving cavity;
The injector body is also provided with a first oil duct, a second oil duct and a third oil duct; the oil outlet end of the first oil duct is communicated with the main chamber, the oil outlet end of the second oil duct is communicated with the sub-chamber, and the oil outlet end of the third oil duct is communicated with the oil return duct; the oil inlet end of the first oil duct, the oil inlet end of the second oil duct and the oil inlet end of the third oil duct are all communicated with the third accommodating cavity;
The first adjustment assembly is configured to enable the first oil passage to alternatively communicate with one of the second oil passage and the third oil passage by means of the third accommodation chamber to adjust the first liquid pressure.
3. The dual fuel injector of claim 2, wherein the first armature assembly has a first state and a second state;
In the first state, the first armature assembly is blocked at the oil inlet end of the third oil duct, so that the first oil duct is communicated with the second oil duct by means of the third accommodating cavity;
in the second state, the first armature assembly is blocked at the oil inlet end of the second oil duct, so that the first oil duct is communicated with the third oil duct by means of the third accommodating cavity.
4. The dual fuel injector of claim 3, wherein the first driver is configured to drive the first armature assembly to move in the first direction to be in the second state.
5. The dual fuel injector of claim 1, wherein the inner needle valve further has a second end remote from the oil sump;
The dual fuel injector also includes a first return spring coupled to the second end of the inner needle valve and the outer needle housing, respectively.
6. The dual fuel injector of claim 1, wherein a side of the injector body where the first opening is provided is further provided with a gas injection hole in communication with the first receiving cavity;
The outer needle shell is movably arranged in the first accommodating cavity along the first direction, the first end of the outer needle shell, where the exposed part is arranged, is blocked in the first opening to block the first accommodating cavity and the air injection hole, the outer needle shell is configured as a subchamber which can be communicated with the first accommodating cavity, the injector body is also provided with a control cavity communicated with the first accommodating cavity, and when the electromagnetic valve is not electrified, the gas pressure in the subchamber is equal to the third liquid pressure in the control cavity;
And a second adjusting assembly provided to the injector body and configured to be able to adjust the third liquid pressure so that the outer needle housing is able to move in the first direction under a pressure difference between the gas pressure and the third liquid pressure to communicate the first accommodating chamber and the gas injection hole through the first opening.
7. The dual fuel injector of claim 6, wherein the injector body further has a second end distal from the first opening;
the second end part of the ejector body is provided with a fourth accommodating cavity, and the second adjusting component is arranged in the fourth accommodating cavity;
The ejector body is further provided with a fourth oil duct and a fifth oil duct, the oil outlet end of the fourth oil duct is communicated with the fourth accommodating cavity, the oil inlet end of the fourth oil duct is communicated with the control cavity, the oil inlet end of the fifth oil duct is communicated with the fourth accommodating cavity, and the oil outlet end of the fifth oil duct is communicated with the oil return channel;
the second adjusting assembly is configured to control on-off between the fourth oil passage and the fifth oil passage by means of the fourth accommodation chamber to adjust the third liquid pressure.
8. The dual fuel injector of claim 6, further comprising a control disposed within the control chamber;
the outer needle housing also has a second end remote from the exposed portion;
One end of the control piece is connected to the second end of the outer needle shell, and under the action of axial force of the threads, the shoulder blade surface of the control piece is abutted against the end face of the second end of the outer needle shell to form a plane sealing pair for isolating the oil control cavity and the air control cavity, so that the pressure in the two control cavities can be regulated and controlled independently.
9. The dual fuel injector of claim 1, further comprising a detent key;
the injector body comprises a needle valve body, and a first groove is formed in the needle valve body;
the outer needle shell is provided with a second groove;
The first groove and the second groove define a positioning hole matched with the positioning key, so that circumferential positioning of the needle valve body and the outer needle shell is realized, and the upper oil passage of the needle valve body is communicated with the oil passage of the outer needle shell in the 180-degree opposite direction through the annular groove.
10. The dual fuel injector of claim 9, wherein the detent hole and the detent key are clearance fit.
11. An engine, comprising: a dual fuel injector as claimed in any one of claims 1 to 10.
12. A vehicle, characterized by comprising: an engine according to claim 11.
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| CN202211081906.1A CN115355120B (en) | 2022-09-06 | 2022-09-06 | Dual fuel injector, engine and vehicle |
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| CN106523165A (en) * | 2016-09-19 | 2017-03-22 | 哈尔滨工程大学 | Integrated mechanical and electromagnetic hybrid-control dual-fuel injection device |
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| JP4297181B2 (en) * | 2007-07-17 | 2009-07-15 | 株式会社デンソー | Injector |
| CN106545446A (en) * | 2017-01-18 | 2017-03-29 | 哈尔滨工程大学 | A kind of two-way feeding type electric-controlled fuel injector with ditch |
| CN110242460B (en) * | 2019-06-13 | 2021-06-22 | 一汽解放汽车有限公司 | Balanced two-position three-way fuel injection valve |
| CN112065593B (en) * | 2020-09-03 | 2022-06-10 | 一汽解放汽车有限公司 | Dual-fuel injector and internal combustion engine |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106523165A (en) * | 2016-09-19 | 2017-03-22 | 哈尔滨工程大学 | Integrated mechanical and electromagnetic hybrid-control dual-fuel injection device |
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