CN114233545A

CN114233545A - Dual-fuel injector and engine

Info

Publication number: CN114233545A
Application number: CN202210008387.XA
Authority: CN
Inventors: 陈利平; 吴潇潇; 杨殿勇; 陈楠
Original assignee: FAW Jiefang Automotive Co Ltd
Current assignee: FAW Jiefang Automotive Co Ltd
Priority date: 2022-01-06
Filing date: 2022-01-06
Publication date: 2022-03-25
Anticipated expiration: 2042-01-06
Also published as: CN114233545B

Abstract

The invention belongs to the technical field of vehicle engineering, and discloses a dual-fuel injector and an engine.A low-pressure cavity, a first feeding channel, a first core cavity, a first nozzle, a second feeding channel, a second core cavity, a second nozzle and a guide hole are arranged on an injector main body, a first valve core is movably arranged in the first core cavity in a penetrating way, a second valve core is movably arranged in the second core cavity in a penetrating way, and a push rod is movably arranged in the guide hole in a penetrating way; the first feeding channel is used for introducing fuel, the control valve assembly can cut off the communication between the first core cavity and the low-pressure cavity, so that the first valve core moves under the action of oil pressure, the communication between the first feeding channel and the first nozzle is cut off, the push rod pushes the second valve core to move under the action of oil pressure, and the communication between the second feeding channel and the second nozzle is cut off. The invention can realize the injection and stop of two fuels at the same time through one control valve component without being controlled by two control valves and two sets of hydraulic control systems, and has more compact and reasonable structure.

Description

Dual-fuel injector and engine

Technical Field

The invention relates to the technical field of vehicle engineering, in particular to a dual-fuel injector and an engine.

Background

The dual fuel injector is a core component of the dual fuel engine, and two fuel passages are arranged on the dual fuel injector, so that two fuels are injected into a combustion chamber of the engine through the corresponding fuel passages to be combusted.

In the existing dual-fuel injector, two control valves and two sets of hydraulic control systems are usually adopted to achieve the purpose of controlling the injection of two fuels, for example, a fuel oil control assembly of the injector controls the on-off of a main oil passage to control the oil injection into a combustion chamber, and a fuel gas control assembly controls the movement of an air injection valve core to control the air injection into the combustion chamber. The structure form occupies a large space, increases the overall arrangement difficulty of the engine, has more overall parts of the injector, and increases the design and manufacturing cost.

Therefore, a need exists for a dual fuel injector and engine that addresses the above-mentioned problems.

Disclosure of Invention

The invention aims to provide a dual-fuel injector and an engine, which have compact and reasonable structures, and reduce the overall arrangement difficulty and the design and manufacturing cost.

In order to achieve the purpose, the invention adopts the following technical scheme:

in a first aspect, a dual-fuel injector is provided, which comprises an injector main body and a control valve assembly, wherein a low-pressure cavity, a first feed channel, a first core cavity, a first nozzle, a second feed channel, a second core cavity, a second nozzle and a guide hole are arranged on the injector main body, the first feed channel can be communicated with the first core cavity and the first nozzle, the first core cavity is communicated with the guide hole, the second feed channel can be communicated with the second nozzle through the second core cavity, a first valve core is movably arranged in the first core cavity, a second valve core is movably arranged in the second core cavity, and a push rod is movably arranged in the guide hole;

the first feeding channel is used for introducing fuel, and the control valve assembly can cut off the communication between the first core cavity and the low-pressure cavity so as to enable the first valve core to move under the action of oil pressure and cut off the communication between the first feeding channel and the first nozzle, and enable the push rod to push the second valve core to move under the action of oil pressure and cut off the communication between the second feeding channel and the second nozzle.

As a preferable scheme of the dual-fuel injector provided by the invention, a separation plate is arranged in the low-pressure cavity, an oil through hole, a first separation plate channel and a second separation plate channel are arranged on the separation plate, an oil inlet of the oil through hole is communicated with the first core cavity, the control valve assembly can block or conduct an oil outlet of the oil through hole, the first feed channel is communicated with the first core cavity through the first separation plate channel, and the first core cavity is communicated with the guide hole through the second separation plate channel.

As a preferred scheme of the dual-fuel injector provided by the invention, the control valve component comprises an electromagnet, an armature, a valve rod and a sealing steel ball, the armature can be magnetically attracted with the electromagnet, the valve rod is arranged on one side of the armature, which is back to the electromagnet, the sealing steel ball is arranged at one end of the valve rod, which is far away from the armature, and the sealing steel ball has a state of plugging and separating from an oil outlet of the oil through hole.

As a preferable scheme of the dual fuel injector provided by the invention, the injector main body is further provided with a first oil duct, a second oil duct and a third oil duct, one end of the first oil duct is communicated with the first feeding channel in a crossing manner, the other end of the first oil duct is communicated with one end of the first partition plate channel far away from the first core cavity, one end of the second oil duct is communicated with one end of the second partition plate channel far away from the first core cavity, the other end of the second oil duct is communicated with the third oil duct, and the third oil duct is coaxially arranged with the guide hole and communicated with the guide hole.

As a preferable scheme of the dual fuel injector provided by the invention, a first inclined plane is circumferentially arranged on the inner wall of the second valve core cavity, a second inclined plane is circumferentially arranged on the outer wall of the second valve core, and the second inclined plane can be in sealing contact with the first inclined plane under the thrust action of the push rod.

As a preferable aspect of the dual fuel injector provided by the present invention, a first return spring is further disposed in the second spool chamber, and the second spool is movable by an elastic force of the first return spring to move the second inclined surface away from the first inclined surface.

As a preferable aspect of the dual fuel injector provided by the present invention, the second valve spool includes a seal portion and a guide rod connected to each other, the second inclined surface is provided on the seal portion, the guide rod extends in an axial direction of the second spool cavity, and the first return spring is fitted over the guide rod.

As a preferable solution of the dual fuel injector provided by the present invention, the first inclined surface is disposed at an end of the second core cavity away from the second feed channel, and the guide rod is disposed at a side of the sealing portion facing away from the push rod.

As a preferable aspect of the dual fuel injector provided by the present invention, an inner wall of the second core chamber is connected to an inner wall of the second feed passage by the first slope, and the guide rod is disposed between the seal portion and the push rod.

As a preferable scheme of the dual fuel injector provided by the invention, a valve seat is connected to the injector main body in a threaded manner, and the second feed passage and the second core chamber are both opened on the valve seat.

As a preferable scheme of the dual-fuel injector provided by the invention, the injector main body is further provided with a first discharging channel and a second discharging channel, one end of the first discharging channel is communicated with the first feeding channel in a crossing manner, the other end of the first discharging channel can be communicated with the first nozzle, one end of the second discharging channel can be communicated with the first feeding channel through the second core cavity, and the other end of the second discharging channel is communicated with the second nozzle.

As a preferable scheme of the dual-fuel injector provided by the invention, the injector main body is provided with a first nozzle, the first nozzle is sleeved at one end of the first valve core extending out of the first valve core cavity, a first injection channel is formed between the inner wall of the first nozzle and the outer wall of the first valve core, the first nozzle is arranged on the first nozzle, and the first discharge channel can be communicated with the first nozzle through the first injection channel.

As a preferable scheme of the dual-fuel injector provided by the invention, the injector main body is further provided with a second nozzle, the second nozzle is sleeved on the first nozzle so as to form a second injection channel between the inner wall of the second nozzle and the outer wall of the first nozzle, the second nozzle is arranged on the second nozzle, and the second discharge channel is communicated with the second nozzle through the second injection channel.

In a second aspect, an engine is provided that includes a dual fuel injector as described above.

The invention has the beneficial effects that:

in the dual-fuel injector and the engine comprising the dual-fuel injector, the control valve assembly can control the communication and the cut-off between the first core cavity and the low-pressure cavity, when the control valve assembly cuts off the communication between the first core cavity and the low-pressure cavity, fuel enters the first core cavity through the first feeding channel, the fuel in the first core cavity can further enter the guide hole, so that high oil pressure exists in the first core cavity and the guide hole, the first valve core can move under the action of the oil pressure to cut off the communication between the first feeding channel and the first nozzle, and the fuel is prevented from being injected into a combustion chamber of the engine through the second nozzle. Similarly, the push rod pushes the second valve spool to move under the action of oil pressure, so that the second valve spool cuts off the communication between the second feeding channel and the second nozzle hole, and therefore fuel input from the second feeding channel is prevented from being injected into a combustion chamber of the engine through the second nozzle hole. When the control valve assembly controls the second core cavity to be communicated with the low-pressure cavity, the oil pressure in the second core cavity and the oil pressure in the guide hole are instantly reduced, and the first valve core and the second valve core both move in opposite directions to re-conduct the first feeding channel and the first nozzle and re-conduct the second feeding channel and the second nozzle, so that fuel introduced into the first feeding channel and the second feeding channel can be sprayed into the combustion chamber. The dual-fuel injector can simultaneously realize the injection and stop of two fuels only through one control valve assembly without arranging two control valves and two sets of hydraulic control systems to control the injection and stop of the two fuels, so that the dual-fuel injector has a more compact and reasonable structure, and reduces the overall arrangement difficulty of an engine and the design and manufacturing cost.

Drawings

FIG. 1 is an overall schematic diagram of a dual fuel injector provided in accordance with an embodiment of the present invention;

FIG. 2 is a first partial view of FIG. 1;

FIG. 3 is an enlarged view of a portion of FIG. 2 at A;

FIG. 4 is a second partial view of FIG. 1;

FIG. 5 is a schematic structural diagram of a partition board according to an embodiment of the present invention;

FIG. 6 is a schematic diagram of a dual fuel injector provided in accordance with a second embodiment of the invention;

fig. 7 is a partially enlarged view at B in fig. 6.

In the figure:

1. an injector body; 2. a control valve assembly; 3. a separator plate; 4. a first valve spool; 5. a second valve core; 6. a push rod;

11. a low pressure chamber; 12. a first core cavity; 13. a valve seat; 14. a first nozzle; 15. a second nozzle; 16. a second return spring;

101. a first feed channel; 102. a first oil passage; 103. a second oil passage; 104. a third oil passage; 105. a guide hole; 106. a first discharge channel; 107. a second discharge channel;

121. a stepped structure; 131. a second feed channel; 132. a second core cavity; 133. a first return spring; 1321. a first inclined plane; 141. a first nozzle; 142. a first injection channel; 143. a first channel; 144. a second channel; 151. a second nozzle; 152. a second injection channel;

21. an electromagnet; 22. an armature; 23. a valve stem; 24. sealing the steel ball;

31. an oil through hole; 32. a first separator channel; 33. a second separator channel;

41. a flange;

51. a sealing part; 52. a guide bar; 511. a second inclined plane.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are used based on the orientations and positional relationships shown in the drawings only for convenience of description and simplification of operation, and do not indicate or imply that the referred device or element must have a specific orientation, be configured and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

Example one

The dual-fuel injector in the prior art usually adopts two control valves and two sets of hydraulic control systems to achieve the purpose of controlling the injection of two fuels, the structural form has larger occupied space, increases the overall arrangement difficulty of an engine, has more overall parts and components, and increases the design and manufacturing cost. As shown in fig. 1 and 2, based on this problem, the present embodiment provides a dual fuel injector including an injector body 1 and a control valve assembly 2.

Referring to fig. 1, 2 and 3, the injector body 1 is provided with a low pressure chamber 11, a first feed passage 101, a first core chamber 12, a first nozzle port 141, a second feed passage 131, a second core chamber 132, a second nozzle port 151 and a guide hole 105. The first feeding channel 101 and the second feeding channel 131 are both used for introducing fuel, in this embodiment, the first feeding channel 101 is used for introducing high-pressure fuel oil, and the second feeding channel 131 can introduce fuel oil or gas. The first feed channel 101 can be communicated with the first core cavity 12 and the first nozzle hole 141, so that fuel in the first feed channel 101 can enter the first core cavity 12 and can be injected through the first nozzle hole 141, and the fuel injected through the first nozzle hole 141 enters the engine combustion chamber to be combusted, so that internal energy is released. The first core chamber 12 communicates with the pilot hole 105 so that the fuel in the first core chamber 12 can enter the pilot hole 105. The second feeding channel 131 can be communicated with the second nozzle hole 151 through the second core chamber 132, so that the fuel in the second feeding channel 131 can be injected through the second nozzle hole 151, and the fuel injected from the first nozzle hole 141 also enters the engine combustion chamber to be combusted, so as to release internal energy. A first valve core 4 is movably arranged in the first core cavity 12 in a penetrating way, a second valve core 5 is movably arranged in the second core cavity 132 in a penetrating way, and a push rod 6 is movably arranged in the guide hole 105 in a penetrating way. That is, the first spool 4 is movable in the axial direction of the first spool chamber 12, the second spool 5 is movable in the axial direction of the second spool chamber 132, and the push rod 6 is movable in the axial direction of the pilot hole 105.

In the dual fuel injector, the communication and the cutoff between the first core chamber 12 and the low pressure chamber 11 can be controlled by the control valve assembly 2. When the control valve assembly 2 cuts off the communication between the first core chamber 12 and the low pressure chamber 11, the fuel enters the first core chamber 12 through the first feed channel 101, and the fuel in the first core chamber 12 can then pass into the pilot hole 105, resulting in a large oil pressure in both the first core chamber 12 and the pilot hole 105. The first spool 4 is movable under oil pressure to cut off communication between the first feed passage 101 and the first nozzle port 141, thereby preventing fuel from being injected into the combustion chamber of the engine through the second nozzle port 151. Similarly, the push rod 6 pushes the second spool 5 to move under the action of oil pressure, so that the second spool 5 cuts off the communication between the second feeding passage 131 and the second nozzle hole 151, thereby preventing the fuel fed from the second feeding passage 131 from being injected into the combustion chamber of the engine through the second nozzle hole 151. When the control valve assembly 2 controls the second spool chamber 132 and the low pressure chamber 11 to communicate with each other, the oil pressure in the second spool chamber 132 and the pilot hole 105 is instantaneously reduced, and the first spool 4 and the second spool 5 are reversely moved to re-conduct the first feed passage 101 and the first nozzle port 141 and re-conduct the second feed passage 131 and the second nozzle port 151, so that the fuel introduced into the first feed passage 101 and the second feed passage 131 can be injected into the combustion chamber. The dual-fuel injector can simultaneously realize the injection and stop of two fuels only by one control valve component 2, and does not need to be provided with two control valves and two sets of hydraulic control systems to control the injection and stop of the two fuels, so that the structure is more compact and reasonable, and the overall arrangement difficulty and the design and manufacturing cost of an engine are reduced.

Referring to fig. 2, optionally, a partition plate 3 is provided within the low pressure chamber 11. Referring to fig. 5, the partition plate 3 is provided with oil passing holes 31, first partition passages 32, and second partition passages 33. The first feed passage 101 communicates with the first core chamber 12 through the first partition passage 32, so that the fuel in the first feed passage 101 can enter the first core chamber 12 through the first partition passage 32. The first core chamber 12 communicates with the guide hole 105 through the second partition passage 33 so that the fuel in the first core chamber 12 can enter the guide hole 105 through the second partition passage 33. The oil through hole 31 is coaxially arranged with the first core cavity 12, an oil inlet of the oil through hole 31 is communicated with the first core cavity 12, and the control valve assembly 2 can block or communicate an oil outlet of the oil through hole 31. When the control valve assembly 2 blocks the outlet of the oil passing hole 31, the oil pressure in the first spool chamber 12 and in the pilot hole 105 is high, and at this time, the first spool 4 and the second spool 5 move to stop injecting the fuel. When the control valve assembly 2 conducts the oil outlet of the oil through hole 31, the first core cavity 12 is instantly communicated with the low pressure cavity 11 through the oil through hole 31, fuel oil in the first core cavity 12 can flow into the low pressure cavity 11 through the oil through hole 31, so that oil pressure in the first core cavity 12 and the guide hole 105 is reduced, oil pressure acting force borne by the first valve core 4 and the push rod 6 disappears, and at the moment, the first valve core 4 and the second valve core 5 both move reversely to start to inject fuel.

Further, a first oil passage 102 is provided between the first partition passage 32 and the first feed passage 101. Referring to fig. 2, the first core chamber 12 extends along the length direction of the injector body 1, and the first feed channel 101 is disposed obliquely with respect to the axial direction of the first core chamber 12, so that the length of the first feed channel 101 can be increased, the occupied space can be reduced, and the structure can be more compact. The first oil passage 102 is parallel to the axial direction of the first core chamber 12, and has one end communicating with the first feed passage 101 in a crossing manner and the other end communicating with the end of the first partition passage 32 remote from the first core chamber 12. The second oil passage 103 is parallel to the axial direction of the first core chamber 12, and has one end communicating with one end of the second partition passage 33 remote from the first core chamber 12 and the other end communicating with the third oil passage 104. The extending directions of the second feeding channel 131, the second core cavity 132 and the guide hole 105 are all perpendicular to the axis of the first core cavity 12, and the third oil passage 104 is coaxially arranged and communicated with the guide hole 105. Referring to fig. 5, each of the first partition passage 32 and the second partition passage 33 includes two cross-communicated passages, and ends of the two passages remote from each other are used to communicate the first core chamber 12 and the first oil passage 102 (second oil passage 103), respectively.

In the present embodiment, the first partition passage 32 and the second partition passage 33 are provided on the partition plate 3, instead of directly providing the passage for communicating the first oil passage 102 with the first core cavity 12 and the passage for communicating the first core cavity 12 with the second oil passage 103 on the injector body 1, so that it is possible to prevent the first valve element 4 from blocking the passage in the moving process and preventing the high-pressure fuel from smoothly entering the first core cavity 12 and the second oil passage 103.

Referring to fig. 2, the control valve assembly 2 includes an electromagnet 21, an armature 22, a valve stem 23, and a sealing steel ball 24. The armature 22 can be magnetically attracted with the electromagnet 21, the valve rod 23 is arranged on one side of the armature 22, which is opposite to the electromagnet 21, the sealing steel ball 24 is arranged at one end of the valve rod 23, which is far away from the armature 22, and the sealing steel ball 24 has a state of plugging and separating from an oil outlet of the oil through hole 31. When the electromagnet 21 is powered off, the electromagnet 21 has no magnetism and is separated from the armature 22, and the valve rod 23 pushes the sealing steel ball 24 at the tail end of the electromagnet to the oil outlet of the oil through hole 31 to seal the oil outlet. At this time, the oil pressure in the first core chamber 12 and the pilot hole 105 is high, and the first and second nozzle holes 141 and 151 stop injecting the fuel. When the electromagnet 21 is energized, the electromagnet 21 is magnetized, and the armature 22 is attracted by the magnetic force of the electromagnet 21 to rise (refer to the orientation in fig. 2), and the valve rod 23 and the sealing steel ball 24 at the end thereof rise accordingly. That is, the sealing steel ball 24 is separated from the oil outlet of the oil passing hole 31, at this time, the first core chamber 12 and the low pressure chamber 11 are communicated, and the first nozzle port 141 and the second nozzle port 151 re-inject the fuel. When the electromagnet 21 is powered off again, the armature 22 moves downwards and drives the valve rod 23 and the sealing steel ball 24 on the valve rod 23 to move upwards so as to conduct the oil through hole 31.

Furthermore, an elastic resetting piece is connected between the electromagnet 21 and the armature 22, when the electromagnet 21 is powered off, the armature 22 can rapidly move under the elastic action of the elastic resetting piece, and meanwhile, the sealing steel ball 24 can be pressed at the oil outlet of the oil through hole 31 under the elastic action of the elastic resetting piece, so that the sealing reliability is ensured.

Referring to fig. 1 and 2, the injector body 1 further defines a first discharging passage 106 and a second discharging passage 107. One end of the first discharge channel 106 is in cross communication with the first feed channel 101, and the other end can be in communication with the first nozzle 141. The first outlet channel 106 and the first oil passage 102 extend in opposite directions from the first inlet channel 101. One end of the second discharging channel 107 can communicate with the first feeding channel 101 through the second core chamber 132, and the other end communicates with the second nozzle 151. In normal operation of the dual fuel injector, fuel oil in the first feeding channel 101 enters the first nozzle 141 through the first discharging channel 106 to be injected, and fuel in the second feeding channel 131 enters the second nozzle 151 through the second core cavity 132 and the second discharging channel 107 to be injected.

Referring to fig. 1 and 4, the injector body 1 is provided with a first nozzle 14 and a second nozzle 15. Referring to the orientation in fig. 4, the lower end of the first valve element 4 extends out of the first core chamber 12, the first nozzle 14 is sleeved at one end of the first valve element 4 extending out of the first core chamber 12, and a first injection channel 142 is formed between the inner wall of the first nozzle 14 and the outer wall of the first valve element 4. The first nozzle 141 is provided at the end of the first nozzle 14. The first nozzle 14 is further provided with a first channel 143 and a second channel 144. The oil outlet end of the first discharging channel 106 is connected with one end of a first channel 143, one end of the first channel 143, which is far away from the first discharging channel 106, is communicated with a first injection channel 142, and the first injection channel 142 can be communicated with a first nozzle 141. The first valve element 4 is brought into sealing contact with the inner wall of the first nozzle 14 when moved downward to close the first injection passage 142, and at this time, the communication between the first injection passage 142 and the first nozzle port 141 is cut off, and the first nozzle port 141 stops injecting the fuel.

Referring to fig. 4, the second nozzle 15 is sleeved on the first nozzle 14, so that a second spraying channel 152 is formed between the inner wall of the second nozzle 15 and the outer wall of the first nozzle 14. The second nozzle 151 is disposed at the end of the second nozzle 15, the discharge port of the second discharging channel 107 is connected to one end of the second channel 144, and one end of the second channel 144 away from the second discharging channel 107 is communicated with the second spraying channel 152. The second spool 5 moves to be in sealing contact with the inner wall of the second spool chamber 132 to close the second spool chamber 132, thereby cutting off the communication between the second feed passage 131 and the second discharge passage 107 and stopping the fuel injection from the second nozzle port 151.

Referring to fig. 2 and 3, the injector body 1 is screwed with the valve seat 13, and the second feeding channel 131 and the second core cavity 132 are both opened on the valve seat 13, so that the layout is reasonable and the installation is convenient.

Alternatively, referring to fig. 3, the inner wall of the second core chamber 132 is circumferentially provided with a first inclined surface 1321, and the outer wall of the second core 5 is circumferentially provided with a second inclined surface 511. When the sealing steel ball 24 is blocked at the oil outlet of the oil through hole 31, the second inclined surface 511 can be in sealing contact with the first inclined surface 1321 under the thrust action of the push rod 6 to close the second core cavity 132, so that the communication between the second feeding channel 131 and the second discharging channel 107 is cut off, and the fuel injection of the second nozzle 151 is stopped. When the electromagnet 21 is energized to make the sealing steel ball 24 away from the oil outlet of the oil through hole 31, the second valve core 5 moves in the reverse direction, and the second inclined surface 511 of the second valve core 5 is away from the first inclined surface 1321, so that the fuel can enter the second discharge passage 107 through the gap formed between the first inclined surface 1321 and the second inclined surface 511.

Further, referring to fig. 3, a first return spring 133 is also disposed in the second core chamber 132. When the electromagnet 21 is energized to separate the sealing steel ball 24 from the oil outlet of the oil passing hole 31, the second spool 5 can move by the elastic force of the first return spring 133 to separate the second inclined surface 511 from the first inclined surface 1321.

Specifically, in the present embodiment, referring to fig. 3, the second valve element 5 includes a sealing portion 51 and a guide rod 52 connected to each other, the second inclined surface 511 is annularly disposed on the sealing portion 51, the guide rod 52 extends along the axial direction of the second valve element cavity 132, the first return spring 133 is sleeved on the guide rod 52, and the guide rod 52 can play a guiding role in the deformation and the return of the first return spring 133. The first inclined surface 1321 is disposed at an end of the second core chamber 132 away from the second feeding passage 131, and the guide rod 52 is disposed at a side of the sealing portion 51 facing away from the push rod 6. The first return spring 133 has one end connected to the inner wall of the second core chamber 132 and the other end connected to the sealing portion 51. The push rod 6 compresses the first return spring 133 by pushing the sealing portion 51 until the second inclined surface 511 comes into sealing contact with the first inclined surface 1321.

Referring to fig. 1 and 4, in the present embodiment, the second return spring 16 is disposed in the first spool chamber 12, and the first spool 4 can move upward under the elastic force of the second return spring 16 to rapidly communicate the first injection passage 142 and the first nozzle port 141, so that the injector is rapidly restored to a normal injection state.

Specifically, referring to fig. 4, the inner wall of the first spool chamber 12 is provided with a stepped structure 121, and the circumference of the first spool 4 is provided with a flange 41. The second return spring 16 is disposed between the stepped structure 121 and the flange 41, and has one end connected to a stepped surface of the stepped structure 121 and the other end connected to a side surface of the flange 41 facing the stepped structure 121. When the first valve core 4 moves downwards, the second return spring 16 is driven by the first valve core 4 to stretch, and when the electromagnet 21 is electrified again, the oil pressure acting force on the upper end of the first valve core 4 disappears, and the first valve core can move upwards quickly under the elastic force of the second return spring 16, so that the first nozzle 141 can inject fuel.

The present embodiments also provide an engine including a dual fuel injector as described above. When the engine is started, the injection and the stop of the two fuels can be simultaneously realized only by one control valve component 2, and the injection and the stop of the two fuels are controlled without arranging two control valves and two sets of hydraulic control systems, so that the structure is more compact and reasonable, and the overall arrangement difficulty and the design and manufacturing cost of the engine are reduced.

Example two

As shown in fig. 6 and 7, the present embodiment provides a dual fuel injector, wherein the same or corresponding parts as those of the first embodiment are given the same reference numerals as those of the first embodiment. For the sake of simplicity, only the differences between the second embodiment and the first embodiment will be described, the differences being:

referring to fig. 7, in the present embodiment, a first inclined surface 1321 is disposed at an end of the second core cavity 132 close to the second feed channel 131, that is, an inner wall of the second core cavity 132 is connected to an inner wall of the second feed channel 131 by the first inclined surface 1321. Accordingly, the sealing portion 51 of the second spool 5 is adjacent to the second feed passage 131, and the guide rod 52 is disposed between the sealing portion 51 and the push rod 6. Further, the injector body 1 is provided with a threaded hole in which the valve seat 13 is mounted, and one end of the first return spring 133 is connected to the seal portion 51 and the other end is connected to the bottom wall of the threaded hole. The push rod 6 causes the second nozzle holes 151 to stop injecting fuel by pushing the guide rod 52 to make the sealing portion 51 draw the first return spring 133 to stretch until the second inclined surface 511 comes into sealing contact with the second inclined surface 511. When the electromagnet 21 is energized, the oil pressure acting force applied to the push rod 6 disappears, and the second valve spool 5 moves under the elastic force of the first return spring 133, so that the second inclined surface 511 is away from the first inclined surface 1321, and the second nozzle 151 injects fuel.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, adaptations and substitutions will occur to those skilled in the art without departing from the scope of the invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A dual-fuel injector is characterized by comprising an injector main body (1) and a control valve assembly (2), wherein a low-pressure cavity (11), a first feeding channel (101), a first core cavity (12), a first nozzle (141), a second feeding channel (131), a second core cavity (132), a second nozzle (151) and a guide hole (105) are arranged on the injector main body (1), the first feeding channel (101) can be communicated with the first core cavity (12) and the first nozzle (141), the first core cavity (12) is communicated with the guide hole (105), the second feeding channel (131) can be communicated with the second nozzle (151) through the second core cavity (132), a first valve core (4) is movably arranged in the first core cavity (12), and a second valve core (5) is movably arranged in the second core cavity (132), a push rod (6) is movably arranged in the guide hole (105) in a penetrating way;

the first feeding channel (101) is used for introducing fuel, and the control valve assembly (2) can cut off the communication between the first core cavity (12) and the low-pressure cavity (11) so that the first valve core (4) moves under the action of oil pressure to cut off the communication between the first feeding channel (101) and the first nozzle (141) and the push rod (6) pushes the second valve core (5) to move under the action of oil pressure to cut off the communication between the second feeding channel (131) and the second nozzle (151).

2. The dual fuel injector of claim 1, characterized in that a separation plate (3) is arranged in the low pressure chamber (11), an oil through hole (31), a first separator channel (32) and a second separator channel (33) are arranged on the separation plate (3), an oil inlet of the oil through hole (31) is communicated with the first core chamber (12), the control valve assembly (2) can block or conduct an oil outlet of the oil through hole (31), the first feed channel (101) is communicated with the first core chamber (12) through the first separator channel (32), and the first core chamber (12) is communicated with the guide hole (105) through the second separator channel (33).

3. The dual fuel injector of claim 2, characterized in that the control valve assembly (2) comprises an electromagnet (21), an armature (22), a valve rod (23) and a sealing steel ball (24), wherein the armature (22) can be magnetically attracted with the electromagnet (21), the valve rod (23) is arranged on one side of the armature (22) facing away from the electromagnet (21), the sealing steel ball (24) is arranged on one end of the valve rod (23) far away from the armature (22), and the sealing steel ball (24) has a state of blocking and separating from an oil outlet of the oil through hole (31).

4. The dual fuel injector of claim 2, characterized in that the injector body (1) is further provided with a first oil passage (102), a second oil passage (103) and a third oil passage (104), one end of the first oil passage (102) is communicated with the first feeding passage (101) in a crossing manner, the other end is communicated with one end of the first partition passage (32) far away from the first core cavity (12), one end of the second oil passage (103) is communicated with one end of the second partition passage (33) far away from the first core cavity (12), the other end is communicated with the third oil passage (104), and the third oil passage (104) is coaxially arranged and communicated with the guide hole (105).

5. The dual fuel injector of claim 1, characterized in that the inner wall of the second spool chamber (132) is circumferentially surrounded by a first ramp (1321), and the outer wall of the second spool (5) is circumferentially surrounded by a second ramp (511), the second ramp (511) being capable of sealing contact with the first ramp (1321) under the thrust of the push rod (6).

6. The dual fuel injector of claim 5, characterized in that a first return spring (133) is further provided in the second spool chamber (132), and the second spool (5) is movable under the elastic force of the first return spring (133) to move the second ramp (511) away from the first ramp (1321).

7. The dual fuel injector of claim 6, characterized in that the second spool (5) includes a sealing portion (51) and a guide rod (52) connected, the second inclined surface (511) is disposed on the sealing portion (51), the guide rod (52) extends in an axial direction of the second spool cavity (132), and the first return spring (133) is sleeved on the guide rod (52).

8. The dual fuel injector of claim 7, characterized in that the first ramp (1321) is arranged at an end of the second core chamber (132) remote from the second feed channel (131), and the guide rod (52) is arranged on a side of the seal (51) facing away from the push rod (6).

9. The dual fuel injector of claim 7, characterized in that the inner wall of the second core chamber (132) is connected with the inner wall of the second feed channel (131) by the first ramp (1321), the guide rod (52) being arranged between the seal (51) and the push rod (6).

10. The dual fuel injector as claimed in claim 1, characterized in that a valve seat (13) is screwed onto the injector body (1), the second feed channel (131) and the second core chamber (132) each opening onto the valve seat (13).

11. The dual fuel injector of claim 1, characterized in that the injector body (1) is further provided with a first discharging channel (106) and a second discharging channel (107), one end of the first discharging channel (106) is communicated with the first feeding channel (101) in a crossing manner, the other end of the first discharging channel can be communicated with the first nozzle orifice (141), one end of the second discharging channel (107) can be communicated with the first feeding channel (101) through the second core cavity (132), and the other end of the second discharging channel is communicated with the second nozzle orifice (151).

12. The dual fuel injector of claim 11, characterized in that the injector body (1) is provided with a first nozzle (14), the first nozzle (14) is sleeved at one end of the first valve core (4) extending out of the first valve core cavity (12), a first injection channel (142) is formed between the inner wall of the first nozzle (14) and the outer wall of the first valve core (4), the first nozzle hole (141) is provided on the first nozzle (14), and the first discharge channel (106) can be communicated with the first nozzle hole (141) through the first injection channel (142).

13. The dual fuel injector of claim 12, characterized in that a second nozzle (15) is further arranged on the injector body (1), the second nozzle (15) is sleeved on the first nozzle (14) so that a second injection channel (152) is formed between the inner wall of the second nozzle (15) and the outer wall of the first nozzle (14), the second nozzle orifice (151) is arranged on the second nozzle (15), and the second discharging channel (107) is communicated with the second nozzle orifice (151) through the second injection channel (152).

14. An engine comprising a dual fuel injector as claimed in any one of claims 1 to 13.