CN115355120A - Dual-fuel injector, engine and vehicle - Google Patents
Dual-fuel injector, engine and vehicle Download PDFInfo
- Publication number
- CN115355120A CN115355120A CN202211081906.1A CN202211081906A CN115355120A CN 115355120 A CN115355120 A CN 115355120A CN 202211081906 A CN202211081906 A CN 202211081906A CN 115355120 A CN115355120 A CN 115355120A
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- accommodating cavity
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- 239000000446 fuel Substances 0.000 title claims abstract description 93
- 238000002347 injection Methods 0.000 claims abstract description 41
- 239000007924 injection Substances 0.000 claims abstract description 41
- 230000009977 dual effect Effects 0.000 claims abstract description 40
- 239000012530 fluid Substances 0.000 claims abstract description 21
- 239000007788 liquid Substances 0.000 claims description 23
- 230000009471 action Effects 0.000 claims description 10
- 230000004308 accommodation Effects 0.000 claims description 8
- 238000007789 sealing Methods 0.000 claims description 5
- 238000004891 communication Methods 0.000 claims description 2
- 238000005507 spraying Methods 0.000 claims description 2
- 239000003921 oil Substances 0.000 abstract description 140
- 239000000295 fuel oil Substances 0.000 abstract description 21
- 230000004044 response Effects 0.000 abstract description 14
- 238000002485 combustion reaction Methods 0.000 abstract description 12
- 238000000034 method Methods 0.000 abstract description 11
- 230000008569 process Effects 0.000 abstract description 11
- 239000002737 fuel gas Substances 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 16
- 230000001105 regulatory effect Effects 0.000 description 7
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 6
- 230000001276 controlling effect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 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
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000036316 preload Effects 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
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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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
The present application relates to a dual fuel injector, engine and vehicle including an injector body, an outer needle housing, an inner needle valve and an adjustment assembly. Specifically, the adjustment assembly adjusts the fluid pressure within the subchamber such that the inner needle valve is axially movable under a fluid pressure differential and fuel is ejected from the fuel injection orifice. In the air injection process, the pressure in the control cavity is adjusted by the adjusting assembly, so that the outer needle shell moves axially, and the fuel gas is injected from the air injection hole. 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 oil does not enter the control cavity any more, so that the high-pressure fuel oil does not become low-pressure fuel oil and enters an oil return channel, and the utilization rate of the high-pressure fuel oil is improved. Meanwhile, high-pressure fuel oil does not enter the control cavity any more, 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
Fuel injectors are provided within cylinders of internal combustion engines to provide controlled fuel delivery for combustion in the cylinders, and may be used to inject fuel directly or indirectly into combustion chambers of the internal combustion engine or into interconnected pre-chambers or combustion air conduits. The dual fuel injector can be integrated in a conventional diesel injector mounting location for injecting fuel directly into the cylinder. Before the compression top dead center, micro diesel oil is firstly injected to serve as a pilot fuel, and then natural gas is injected to a combustion chamber to serve as a main fuel to do work.
In the related technology, the control valve for controlling oil injection and air injection of the dual-fuel injector adopts a two-position two-way structure, when the electromagnetic valve is electrified for fuel injection, high-pressure fuel oil still enters the control cavity and then becomes low-pressure return oil to flow out, so that high-pressure fuel oil loss is caused, and the efficiency of an engine is not improved. Meanwhile, in the valve opening process, because high-pressure fuel oil is continuously supplemented into the control cavity, the pressure drop speed in the control cavity is low, the opening time of the needle valve is long, and the improvement of the response performance is not facilitated.
Disclosure of Invention
Therefore, the dual-fuel injector, the engine and the vehicle are needed to solve the problems that the needle valve of the existing dual-fuel injector is long in opening response time, high-pressure fuel enters the control cavity when the control valve is opened and becomes low-pressure return oil, high-pressure fuel loss is caused, and efficiency of the engine is not improved favorably.
An embodiment of the present application provides a dual fuel injector, including: the ejector comprises an ejector body, a first valve and a second valve, wherein the ejector body is provided with a first accommodating cavity, and a first opening communicated with the first accommodating cavity is formed in a first end part of the ejector body; the outer needle shell is arranged in the first accommodating cavity of the injector body, an exposed part extending out of the first accommodating cavity and the first opening is arranged at the first end of the outer needle shell, and an oil injection hole is formed in the exposed part; the outer needle shell is provided with a second containing cavity extending along a first direction, and an oil outlet groove which is respectively communicated with the second containing cavity and the oil injection hole is formed by the surrounding of one end of the outer needle shell, which is provided with the exposed part, and the exposed part; the inner needle valve is movably arranged in the second accommodating cavity along the first direction, and a first end of the inner needle valve is blocked at a notch of the oil outlet groove so as to block the second accommodating cavity and the oil injection hole; the inner needle valve is configured to be capable of dividing the second accommodating chamber into a main chamber and a sub-chamber which are not communicated with each other, and in the case where the solenoid valve is not communicated, a first liquid pressure in the main chamber and a second liquid pressure in the sub-chamber are equal; and a first regulating assembly provided to the injector body and configured to regulate the first fluid pressure such that the inner needle valve is movable in the first direction under a pressure difference between the first fluid pressure and the second fluid pressure to communicate the second receiving chamber and the oil jet hole through the notch of the oil outlet 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 arranged at a distance from the first accommodating cavity along the first direction, and the first adjusting assembly is arranged in the third accommodating cavity; the ejector 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 cavity, the oil outlet end of the second oil duct is communicated with the sub-cavity, 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 regulation assembly is configured to enable the first oil passage to communicate alternatively with one of the second oil passage and the third oil passage via the third accommodation chamber to regulate the first hydraulic 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 channel, so that the first oil channel is communicated with the second oil channel 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 drive member; the first driver is configured to drive the first armature assembly to move in the first direction to the second state.
In one embodiment, the inner needle valve further has a second end remote from the oil outlet groove; the dual fuel injector further includes a first return spring connected to the second end of the inner needle valve and the outer needle housing, respectively.
In one embodiment, an air injection hole communicated with the first accommodating cavity is further formed in one side, provided with the first opening, of the ejector body; the outer needle shell is movably arranged in the first accommodating cavity along the first direction, a first end of the outer needle shell, provided with the exposed part, is plugged in the first opening to block the first accommodating cavity and the gas spraying hole, the outer needle shell is constructed into a sub-cavity capable of being communicated with the first accommodating cavity, the ejector body is further provided with a control cavity communicated with the first accommodating cavity, and the gas pressure in the sub-cavity is equal to the third liquid pressure in the control cavity; a second adjustment assembly disposed on the injector body and configured to adjust the third liquid pressure to enable the outer needle housing to move in the first direction under a pressure differential between the gas pressure and the third liquid pressure to communicate the first receiving chamber and the gas orifice through the first opening.
In one embodiment, the injector body further has a second end distal from the first opening; a fourth accommodating cavity is formed in the second end of the ejector body, and the second adjusting assembly is arranged in the fourth accommodating cavity; the ejector body is also 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 duct; the second regulation assembly is configured to be able to control opening and closing between the fourth oil passage and the fifth oil passage by means of the fourth accommodation chamber to regulate the third liquid pressure.
In one embodiment, the dual fuel injector further includes a control member disposed within the control chamber; the outer needle housing further having a second end distal to 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 scapular 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 comprises a positioning key; the ejector body is provided with a first groove; a second groove is formed in the outer needle shell; the first groove and the second groove define a positioning hole matched with the positioning key.
In one embodiment, the positioning hole and the positioning key are in clearance fit.
An embodiment of the present application provides an engine, including: such as the dual fuel injector described above.
An embodiment of the present application provides a vehicle, includes: 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 adjustment assembly adjusts the fluid pressure within the subchamber such that the inner needle valve is axially movable under a fluid pressure differential and fuel is ejected from the fuel injection orifice. In the air injection process, the pressure in the control cavity is regulated by the regulating assembly, so that the outer needle shell moves axially, and the 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 oil does not enter the control cavity any more, so that the high-pressure fuel oil does not become low-pressure fuel oil and enters an oil return channel, and the utilization rate of the high-pressure fuel oil is improved. Meanwhile, high-pressure fuel oil does not enter the control cavity any more, so that the pressure in the control cavity can be quickly reduced, the opening time of the 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 structural diagram of a dual fuel injector provided in accordance with an 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 the second state of the first armature assembly of the dual fuel injector shown in FIG. 1;
FIG. 4 is a schematic diagram of a dual fuel injector body according to another embodiment of the present application;
FIG. 5 is a schematic diagram of a portion of the dual fuel injector of FIG. 1;
fig. 6 is a cross-sectional view of a portion of the structural schematic of the dual fuel injector shown in fig. 5.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiments in many different forms than those described herein and that modifications may be made by one skilled in the art without departing from the spirit and scope of the application and it is therefore not intended to be limited to the specific embodiments disclosed below.
In the description of the present application, it is to be understood that the terms "central," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and to simplify the description, but are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the present application.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless explicitly specified otherwise.
In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and encompass, for example, both fixed and removable connections or integral parts thereof; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "above," and "over" a second feature may be directly on or obliquely above the second feature, or simply mean that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
It will be understood that when an element is referred to as being "secured to" 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. As used herein, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are for purposes of illustration only and do not denote a single embodiment.
As background art, in the injection process of the current dual-fuel injector, a two-position two-way structure is adopted for a valve for controlling oil injection and air injection, and in the fuel injection process when an electromagnetic valve is electrified, high-pressure fuel oil still enters a control cavity and then becomes low-pressure return oil to flow out, so that the loss of the high-pressure fuel oil is caused, and the efficiency of an engine is not improved. Meanwhile, in the valve opening process, because high-pressure fuel oil is continuously supplemented into the control cavity, the pressure drop speed in the control cavity is low, the opening time of the needle valve is long, and the improvement of the response performance is not facilitated. 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 problems.
Fig. 1 is a schematic structural diagram of a dual fuel injector provided in an embodiment of the present application.
An embodiment of the present application provides a dual fuel injector, as shown in fig. 1, including 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 cavity, the first end 111 of the injector body being provided with a first opening communicating with the first receiving cavity. The outer needle housing 200 is arranged in a first receiving cavity of the injector body 100, and a first end 211 of the outer needle housing is provided with an exposed portion 212 extending out of the first receiving cavity and the first opening, the exposed portion 212 is provided with an oil jet hole 213, and the outer needle housing 200 has a second receiving cavity 214 extending in the first direction X. And the outer needle housing 200 has one end of the exposed portion 212 and the exposed portion 212 enclosing an oil outlet groove 215 communicated with the second accommodating chamber 214 and the oil injection hole 213, the inner needle valve 300 is movably disposed in the second accommodating chamber 214 along the first direction X, and the first end of the inner needle valve is blocked in the notch of the oil outlet groove 215 to block the second accommodating chamber 214 and the oil injection hole 213.
The inner needle valve 300 is configured to be able to divide the second accommodation chamber 214 into a main chamber 311 and a sub-chamber 312 that are not communicated with each other, and in the case where the solenoid valve is not energized, the first liquid pressure in the main chamber 311 and the second liquid pressure in the sub-chamber 312 are equal. The first regulation assembly 400 is provided to the injector body 100 and is configured to be capable of regulating the first fluid pressure such that the inner needle valve 300 is capable of moving in a first direction X to communicate the second accommodation chamber 214 and the injection hole 213 through the notch of the oil discharge groove 215 under a pressure difference between the first fluid pressure and the second fluid pressure, wherein the first direction X is parallel to the axial direction of the injector body 100.
It should be noted that the first adjusting assembly 400 adjusts the first fluid 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 fluid pressure and the second fluid pressure to communicate the second receiving chamber 214 and the oil jet 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 fuel outlet groove 215, and the fuel is injected from the fuel injection hole, so that the response time of the whole opening process of the inner needle valve 300 is short, and the problem of long opening response time of the existing dual-fuel injector needle valve is 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 presses the injector upper body 11, the injector middle body 12 and the injector lower body 13 against each other, and the nozzle tightening cap 16 is also screwed with the injector lower body 13 and presses the transition block 14, the needle valve body 15 and the injector lower body 13 against each other.
In some embodiments, the inner needle valve 300 is coaxially embedded in 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 at intervals along the first direction X. The first annular groove 314 is disposed around the first axis L1 to enclose the main chamber 311 between a groove wall of the first annular groove 314 and a cavity wall of the second accommodating chamber 214, and the second annular groove 315 is disposed around the first axis L1 to enclose the divided chamber 312 between a groove wall of the second annular groove 315 and the second accommodating chamber 214.
In some embodiments, the injector body 100 is provided with a third accommodating cavity 113 spaced from the first accommodating cavity along the first direction X, the first adjusting assembly 400 is disposed in the third accommodating cavity 113, the injector body 100 is further provided with a first oil passage 114, a second oil passage 115 and a third oil passage 116, an oil outlet end of the first oil passage 114 is communicated with the main cavity 311, and an oil outlet end of the second oil passage 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, 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 regulation 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 regulate the first liquid pressure.
As such, when the first regulation assembly 400 causes the first oil passage 114 to communicate with the second oil passage 115 via the third accommodation chamber 113, a part of the fuel oil flows into the sub-chamber 312 through the second oil passage 115, and another part of the fuel oil flows into the first oil passage 114 via 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. At this time, the first end 310 of the inner needle valve is blocked by the notch of the oil outlet groove 215 to block the second accommodating chamber 214 and the oil injection hole 213, and the fuel in the second accommodating chamber 214 cannot flow into the oil injection hole 213 through the oil outlet groove 215, that is, the fuel cannot be injected from the oil injection hole 213.
When it is required to open the inner needle valve 300 to inject fuel, the first regulating assembly 400 makes the first oil passage 114 communicate with the third oil passage 116 via the third accommodating chamber 113, the fuel in the main chamber 311 flows out via the first oil passage 114, the third accommodating chamber 113 and finally the third oil passage 116, and the fuel pressure in the main chamber 311 is rapidly reduced because the fuel is not supplemented any more. 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, an upward acting force is generated, the inner needle valve 300 is lifted upwards under the acting force, fuel is sprayed out of the fuel injection hole 213 through the fuel outlet groove 215 to enter the combustion chamber, at the moment, 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 blocked off an oil inlet end of the third oil passage 116 to communicate the first oil passage 114 with the second oil passage 115 via the third receiving chamber 113, and a second state in which the first armature assembly 410 is blocked off an oil inlet end of the second oil passage 115 to communicate the first oil passage 114 with the third oil passage 116 via the third receiving chamber 113.
Further, the first adjustment assembly 400 further includes a first driver 411, and the first driver 411 is configured to drive the first armature assembly 140 to move along the first direction X to be in the second state. In particular, the first drive member comprises a first electromagnet.
Fig. 2 is a partial enlarged view at a of a first state of a first armature assembly of the dual fuel injector shown in fig. 1, and fig. 3 is a partial enlarged view at a second state of the first armature assembly of the dual fuel injector shown in fig. 1.
Further, as shown in fig. 1-3, the first armature assembly 410 includes a first armature 412 and a first armature stem 413, the first armature 412 and the first armature stem 413 having an interference fit with no relative movement therebetween, 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 in the third accommodating chamber 113 under the attraction force of the first electromagnet and the spring pre-load force of the second return spring 414. Specifically, when the first electromagnet is not powered on, the first armature assembly 410 is located 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 rod and the upper end face 4132 of the lower body are in contact to form a sealing pair, the first armature rod 413 is enclosed at the oil inlet end of the third oil passage 116, and the third oil passage 116 is blocked. When the first electromagnet is energized, the first armature assembly 410 moves upward against the pre-tightening force of the spring under the action of the electromagnetic force, the first armature rod conical surface 4133 and the intermediate conical surface 4134 contact to form a sealing pair, the second oil passage 115 is blocked, and the first oil passage 114 is communicated with the third oil passage 116.
It will be appreciated that the first armature assembly 410 closes the second oil passage 115 during the upward lift 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 oil does not enter the main cavity 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 component 410 is lifted, the fuel in the main chamber 311 is not supplemented any more, so that the pressure in the main chamber 311 can be quickly 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 sump 215, and the dual fuel injector further includes a first return spring 500 connected to the second end 313 of the inner needle valve and the outer needle housing, respectively. As shown, a spring pre-load force is provided by the first return spring 500, so that the first end 310 of the inner needle valve blocks the notch of the oil outlet groove 215 to block the second receiving chamber 214 and the oil injection hole 213.
In some embodiments, the side of the injector body 100 where the first opening is disposed is further provided with an air injection hole 117 communicated with the first accommodating cavity, the outer needle housing 200 is movably disposed in the first direction X in the first accommodating cavity, and the first end of the outer needle housing 200 where the exposed portion 212 is disposed is blocked at the first opening to block the first accommodating cavity and the air injection hole 213. The outer needle housing 200 is configured as a sub-chamber 216 which is capable of communicating with the first receiving chamber, the injector body 100 is further provided with a control chamber 217 which is in communication with the first receiving chamber, and when the electromagnet is not energised, the pressure of the gas in the sub-chamber 216 and the pressure of the third liquid in the control chamber 217 are equal. The second regulating assembly 600 is provided to the injector body 100 and is configured to be capable of regulating the third liquid pressure to enable the outer needle housing 200 to move in the first direction X under a pressure differential between the gas pressure and the third liquid pressure to communicate the first receiving 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 sub-chamber 216 between a wall of the third annular groove 219 and a wall of the first receiving chamber.
In some embodiments, the injector body 100 further has a second end 118 far from the first opening, the second end 118 of the injector body is provided with a fourth accommodating cavity 119, the second adjusting assembly 600 is provided in the fourth accommodating 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 is communicated with the fourth accommodating cavity 119. An oil inlet end of the fourth oil passage 120 is communicated with the control cavity 217, an oil inlet end of the fifth oil passage 121 is communicated with the fourth accommodating cavity 119, an 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 be capable of controlling the connection and disconnection between the fourth oil passage 120 and the fifth oil passage 121 by means of the fourth accommodating cavity 119 so as to adjust the third hydraulic pressure.
Fig. 4 is a schematic structural diagram of an injector body of a dual fuel injector provided in another embodiment of the present application.
In some embodiments, as shown in FIG. 4, the first adjustment assembly 400 is used to control the third fluid pressure within the chamber 217 to control the movement of the outer needle housing 200 in the first direction X, which in turn controls the injection of gas. The second regulation assembly 600 is used for controlling the first fluid pressure in the main chamber 311 to control the movement of the inner needle valve 300 in the first direction X, and thus controlling the injection of the 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 has a second end 218 remote from the exposed portion, one end of the control member 700 is threadably coupled to the second end 218 of the outer needle housing, and under axial force of the threads, the shoulder blade of the control member 700 abuts the end surface of the second end 218 of the outer needle housing to form a planar sealing pair for isolating the control chamber 311 from the control chamber 217, thereby facilitating 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 recess 710 disposed about the third axis L3 to enclose the control chamber 217 between a wall of the fourth annular recess 710 and a wall of the first receiving chamber.
For convenience of understanding, the dual fuel injector provided by this embodiment is described with reference to a specific application scenario, a gas injection process of the dual fuel injector is controlled by the electromagnet 610 and the gas control valve assembly 620, when the electromagnet 610 is powered on, the second armature 630 moves upward under the action of attraction force of the electromagnet against the pre-tightening force of the third return spring 640, and fuel in the control chamber 217 passes through the fourth accommodating chamber 119 and finally flows out from the fifth oil passage 121, it should be noted that, since the aperture of the oil outlet metering hole 122 is larger than the aperture of the oil inlet metering hole 123, more fuel flows out from the control chamber 217 than fuel enters, and therefore the pressure in the control chamber 217 is reduced. When the pressure is reduced to a certain set value, the outer needle housing 200 is lifted upwards against the pre-tightening force of the spring of the fourth return spring 800 under the action of the gas in the sub-chamber 216, and the gas is ejected from the gas ejection hole 117 and enters the combustion chamber of the engine. At the moment, a small amount of compression ignition diesel oil sprayed into the combustion chamber quickly ignites a large amount of sprayed natural gas, and the natural gas is combusted to push the piston to move downwards to complete work. When the electromagnet 610 is powered off, the electromagnet 610 moves downwards under the action of the pretightening force of the third return spring 640 so that the oil outlet end of the fourth oil duct 120 is closed, the fuel oil in the control cavity 217 does not flow out any more, the pressure in the cavity rises gradually, when the pressure in the control cavity 217 rises to a certain value, the outer needle shell 200 overcomes the gas pressure to move downwards under the action of hydraulic oil and the action of the fourth return spring 800, and when the conical surface of the outer needle shell 200 is in contact with the injector body 100, the gas injection hole 117 is closed, and the gas injection process is finished.
Fig. 5 is a partial structural schematic view of the dual fuel injector shown in fig. 1, and fig. 6 is a cross-sectional view of the partial structural 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 positioning key 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 positioning hole (not shown) that is engaged with the positioning key 900, and particularly in some embodiments, the positioning hole is in clearance fit with the positioning key 900.
Thus, the positioning key 900 ensures circumferential angle 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, axial movement of the needle valve body 15 and the outer needle housing 200 is not affected, and fuel flows into the main cavity 311 and the sub-cavity 312 of the inner needle valve 300 from the needle valve body 15 and needs to flow through the outer needle housing 200. In order to ensure the stress balance of the outer needle casing 200 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 casing 200 are circumferentially arranged by 180 degrees, and similarly, the second oil passage 115 of the needle valve body 15 and the lower oil passage 325 of the outer needle casing 200 are circumferentially arranged by 180 degrees, so that the fuel oil flows out of the needle valve body 15, passes through the upper annular groove 332 and the lower annular groove 324 of the outer needle casing 200, reaches the upper oil passage 323 and the lower oil passage 325 of the outer needle casing 200 in the opposite 180-degree direction, and enters the second accommodating cavity 214 inside the outer needle casing 200.
An embodiment of the present application provides an engine including a dual fuel injector as described above including an injector body 100, an outer needle housing 200, an inner needle valve 300, and a first adjustment assembly 400. Specifically, the first regulation assembly 400 regulates the first fluid pressure within the main chamber 311 such that the inner needle valve 300 is movable in the first direction X under a pressure differential between the first fluid pressure and the second fluid pressure to communicate the second receiving chamber 214 and the injection hole 213 through the notch of the oil discharge groove 215. And then the fuel in the second accommodating cavity 214 flows into the fuel injection hole 213 through the fuel outlet groove 215, and the fuel is injected from the fuel injection hole 213, so that the response time of the whole opening process of the inner needle valve 300 is short, and the problem of the loss of the engine power caused by the long opening response time of the needle valve in the traditional injector is further solved.
The embodiment of the application provides a vehicle, including the engine as above, the engine includes the dual-fuel injector in the above embodiments, the response time of the whole opening process of the inner needle valve 300 of the dual-fuel injector is short, and then the problem of the loss of engine power caused by the long opening response time of the needle valve in the existing injector is improved.
All possible combinations of the technical features of the above embodiments may not be described for the sake of brevity, but should be considered as within the scope of the present disclosure as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, and these are all within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (12)
1. A dual fuel injector, comprising:
the ejector comprises an ejector body, a first connecting rod and a second connecting rod, wherein the ejector body is provided with a first accommodating cavity, and a first opening communicated with the first accommodating cavity is formed in the first end of the ejector body;
the outer needle shell is arranged in the first accommodating cavity of the injector body, an exposed part extending out of the first accommodating cavity and the first opening is arranged at the first end of the outer needle shell, and an oil injection hole is formed in the exposed part; the outer needle shell is provided with a second containing cavity extending along a first direction, and an oil outlet groove which is respectively communicated with the second containing cavity and the oil injection hole is formed by the surrounding of one end of the outer needle shell, which is provided with the exposed part, and the exposed part;
the inner needle valve is movably arranged in the second accommodating cavity along the first direction, and a first end of the inner needle valve is blocked and arranged in a notch of the oil outlet groove so as to block the second accommodating cavity and the oil injection hole; the inner needle valve is configured to divide the second accommodating cavity into a main cavity and a sub-cavity which are not communicated with each other, and when the electromagnetic valve is not electrified, the first liquid pressure in the main cavity is equal to the second liquid pressure in the sub-cavity; and
a first adjustment assembly disposed on the injector body and configured to adjust the first fluid pressure such that the inner needle valve is movable in the first direction under a pressure difference between the first fluid pressure and the second fluid pressure to communicate the second receiving chamber with the injector orifice through the notch of the oil outlet groove;
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 defines a third receiving cavity spaced from the first receiving cavity in the first direction, the first adjustment assembly being disposed within the third receiving cavity;
the ejector 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 cavity, the oil outlet end of the second oil duct is communicated with the sub-cavity, 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 regulation assembly is configured to be able to communicate the first oil passage alternatively with one of the second oil passage and the third oil passage by way of the third accommodation chamber to regulate the first liquid pressure.
3. The dual fuel injector of claim 2 wherein 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 channel, so that the first oil channel is communicated with the second oil channel by means of the third accommodating cavity;
in the second state, the first armature assembly encloses the oil inlet end of the second oil passage, so that the first oil passage is communicated with the third oil passage by means of the third accommodating cavity.
4. The dual fuel injector of claim 3, wherein 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.
5. The dual fuel injector of claim 1, wherein the inner needle valve further has a second end distal from the oil drain sump;
the dual fuel injector further includes a first return spring connected to the second end of the inner needle valve and the outer needle housing, respectively.
6. The dual fuel injector of claim 1 wherein the side of the injector body at which the first opening is located is further provided with a gas orifice in communication with the first receiving cavity;
the outer needle shell is movably arranged in the first accommodating cavity along the first direction, a first end of the outer needle shell, which is provided with the exposed part, is blocked and arranged at the first opening so as to block the first accommodating cavity and the gas spraying hole, the outer needle shell is constructed into a sub-cavity which can be communicated with the first accommodating cavity, the ejector 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 sub-cavity is equal to the third liquid pressure in the control cavity;
a second adjustment assembly disposed on the injector body and configured to adjust the third liquid pressure to enable the outer needle housing to move in the first direction under a pressure differential between the gas pressure and the third liquid pressure to communicate the first receiving chamber and the gas orifice 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;
a fourth accommodating cavity is formed in the second end of the ejector body, and the second adjusting assembly is arranged in the fourth accommodating cavity;
the ejector body is also 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 duct;
the second regulation component is configured to be capable of controlling on-off between the fourth oil passage and the fifth oil passage by means of the fourth accommodation chamber to regulate 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 further having a second end distal 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 scapular 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 independent adjustment and control of pressure in the two control cavities are facilitated.
9. The dual fuel injector of claim 1, further comprising a positioning key;
the needle valve body is provided with a first groove;
a second groove is formed in the outer needle shell;
the first groove and the second groove define positioning holes matched with the positioning keys, so that circumferential positioning of the needle valve body and the outer needle shell is achieved, and an oil channel on the needle valve body is communicated with an oil channel of the outer needle shell in the direction of 180 degrees in opposite directions through an annular groove.
10. The dual fuel injector of claim 9, wherein the locator bore and the locator 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: the engine of claim 11.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211081906.1A CN115355120B (en) | 2022-09-06 | 2022-09-06 | Dual fuel injector, engine and vehicle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211081906.1A CN115355120B (en) | 2022-09-06 | 2022-09-06 | Dual fuel injector, engine and vehicle |
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| CN115355120B CN115355120B (en) | 2024-08-13 |
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| US20090020631A1 (en) * | 2007-07-17 | 2009-01-22 | Denso Corporation | Gaseous fuel injector using liquid fuel as lubricant and pressure-transmitting medium |
| 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 |
| 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 |
| CN110242460A (en) * | 2019-06-13 | 2019-09-17 | 一汽解放汽车有限公司 | A kind of balanced type two-bit triplet fuel injection valve |
| CN112065593A (en) * | 2020-09-03 | 2020-12-11 | 一汽解放汽车有限公司 | Dual-fuel injector and internal combustion engine |
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2022
- 2022-09-06 CN CN202211081906.1A patent/CN115355120B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090020631A1 (en) * | 2007-07-17 | 2009-01-22 | Denso Corporation | Gaseous fuel injector using liquid fuel as lubricant and pressure-transmitting medium |
| 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 |
| 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 |
| CN110242460A (en) * | 2019-06-13 | 2019-09-17 | 一汽解放汽车有限公司 | A kind of balanced type two-bit triplet fuel injection valve |
| CN112065593A (en) * | 2020-09-03 | 2020-12-11 | 一汽解放汽车有限公司 | Dual-fuel injector and internal combustion engine |
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|---|---|
| CN115355120B (en) | 2024-08-13 |
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