CN115095459A - Fuel premixing injector - Google Patents
Fuel premixing injector Download PDFInfo
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- CN115095459A CN115095459A CN202210785396.XA CN202210785396A CN115095459A CN 115095459 A CN115095459 A CN 115095459A CN 202210785396 A CN202210785396 A CN 202210785396A CN 115095459 A CN115095459 A CN 115095459A
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- liquid inlet
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- 239000000446 fuel Substances 0.000 title claims abstract description 325
- 238000002347 injection Methods 0.000 claims abstract description 131
- 239000007924 injection Substances 0.000 claims abstract description 131
- 238000002156 mixing Methods 0.000 claims abstract description 45
- 239000007788 liquid Substances 0.000 claims description 221
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims 1
- 238000002485 combustion reaction Methods 0.000 description 22
- 239000007789 gas Substances 0.000 description 17
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 238000003825 pressing Methods 0.000 description 4
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 238000000889 atomisation Methods 0.000 description 3
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- LCGLNKUTAGEVQW-UHFFFAOYSA-N Dimethyl ether Chemical compound COC LCGLNKUTAGEVQW-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 230000013011 mating Effects 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000003350 kerosene Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
Images
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 invention relates to the technical field of fuel injectors, and particularly discloses a fuel premixing injector which comprises a body, a first fuel injection valve and a second fuel injection valve. The body is provided with a first fuel inlet, a second fuel inlet and a jet orifice, the body is internally provided with a first fuel storage cavity and a mixing cavity, the first fuel inlet is communicated with the first fuel storage cavity, the second fuel inlet and the jet orifice are communicated with the mixing cavity, and the first fuel storage cavity is provided with a first fuel outlet channel communicated with the mixing cavity. A first fuel injection valve is disposed in the first fuel reservoir, the first fuel injection valve being configured to control opening and closing of the first fuel outlet passage. A second fuel injection valve is disposed within the mixing chamber, the second fuel injection valve being configured to control opening and closing of the injection port. The fuel premixing injector has the advantages that the first fuel and the second fuel share the injection port, the risk of injection port blockage is reduced, the structure is simple, and the cost is low.
Description
Technical Field
The invention relates to the technical field of fuel injectors, in particular to a fuel premixing injector.
Background
For a mixed fuel engine, two fuel devices are typically provided for dual fuel delivery. Two fuel plants generally comprise two injectors, one of which injects gaseous fuel and the other of which injects liquid fuel. Although the structure realizes dual-fuel supply, the structure adopts two injectors to inject fuel, so that the original engine needs to be greatly changed, more accessories are additionally added, and the installation becomes complicated.
In order to solve the above problems, an integrated injector capable of injecting two fuels is widely used, and the existing integrated injectors are generally provided with a gas injection port and a liquid injection port which are separated from each other, and alternately spray the fuel in the piston via the separated gas injection port and the liquid injection port when the integrated injector is operated. Since the gas ejection openings and the liquid ejection openings are alternately used, clogging of the gas ejection openings and the liquid ejection openings due to carbon deposition is liable to occur during combustion.
Therefore, there is a need to provide a fuel premixing injector to solve the above problems.
Disclosure of Invention
The invention provides a fuel premixing injector which shares a group of injection ports, reduces the risk of injection port blockage, and has simple structure and lower cost.
In order to achieve the purpose, the invention adopts the following technical scheme:
a fuel premix injector comprising:
the fuel injection device comprises a body, wherein a first fuel inlet, a second fuel inlet and an injection port are formed in the body, a first fuel storage cavity and a mixing cavity are formed in the body, the first fuel inlet is communicated with the first fuel storage cavity, the second fuel inlet and the injection port are both communicated with the mixing cavity, and a first fuel outlet channel communicated with the mixing cavity is formed in the first fuel storage cavity;
a first fuel injection valve provided in the first fuel reservoir, the first fuel injection valve being configured to control opening and closing of the first fuel outlet passage;
a second fuel injection valve provided in the mixing chamber, the first fuel injection valve being configured to control opening and closing of the injection port.
Optionally, the first fuel injection valve includes:
a first valve body;
the first control chamber is fixed in the body, a first liquid inlet and a first liquid outlet are formed in the first control chamber, a first elastic piece is arranged in the first control chamber, the first valve body is hermetically arranged in the first control chamber in a penetrating mode and connected with the first elastic piece, and the first valve body can move along the Z-axis direction to block or open the first fuel outlet channel;
a first liquid inlet channel, one end of which is communicated with the first fuel inlet;
one end of the second liquid inlet channel is communicated with the other end of the first liquid inlet channel through a first liquid inlet throttling part, a first liquid inlet throttling hole is formed in the first liquid inlet throttling part, the cross sectional area of the first liquid inlet throttling hole is smaller than that of the first liquid inlet channel, and the other end of the second liquid inlet channel is communicated with the first liquid inlet;
one end of the first liquid outlet channel is communicated with the first liquid outlet;
one end of the second liquid outlet channel is communicated with the other end of the first liquid outlet channel through a first throttling part, a first throttling hole is formed in the first throttling part, and the cross-sectional area of the first throttling hole is smaller than that of the first liquid outlet channel;
the first fuel injection control valve is arranged on the second liquid outlet channel;
the diameter of the first inlet orifice is smaller than the diameter of the first outlet orifice.
Optionally, a first guide rod is arranged in the first control chamber, the first guide rod extends along the Z-axis direction, one end of the first guide rod is connected with the first valve body, and the first guide rod is slidably connected with a first guide groove in the first control chamber.
Optionally, the first guide rod is cylindrical, and a plurality of first liquid storage rings are arranged on the circumferential surface of the first guide rod.
Optionally, the second fuel injection valve comprises:
a second valve body;
the second control chamber is fixed in the body, a second liquid inlet and a second liquid outlet are formed in the second control chamber, a second elastic part is arranged in the second control chamber, the second valve body is hermetically arranged in the second control chamber in a penetrating mode and connected with the second elastic part, and the second valve body can move along the Z-axis direction to seal or open the jet orifice;
a third liquid inlet channel, one end of which communicates with the first fuel inlet;
one end of the fourth liquid inlet channel is communicated with the other end of the third liquid inlet channel through a second liquid inlet throttling part, a second liquid inlet throttling hole is formed in the second liquid inlet throttling part, the cross sectional area of the second liquid inlet throttling hole is smaller than that of the third liquid inlet channel, and the other end of the fourth liquid inlet channel is communicated with the second liquid inlet;
one end of the third liquid outlet channel is communicated with the second liquid outlet;
one end of the fourth liquid outlet channel is communicated with the other end of the third liquid outlet channel through a second throttling outlet, a second throttling outlet is arranged on the second throttling outlet, and the cross-sectional area of the second throttling outlet is smaller than that of the third liquid outlet channel;
the second fuel injection control valve is arranged on the fourth liquid outlet channel;
the diameter of the second inlet orifice is smaller than the diameter of the second outlet orifice.
Optionally, a second guide rod is arranged in the second control chamber, the second guide rod extends along the Z-axis direction, one end of the second guide rod is connected with the second valve body, and the second guide rod is slidably connected with a second guide groove in the second control chamber.
Optionally, the second guide rod is cylindrical, and a plurality of second liquid storage rings are arranged on the circumferential surface of the second guide rod.
Optionally, the first fuel reservoir is disposed within the second valve body;
or the body is of a split and overlapped structure.
Optionally, a flow control portion is arranged on the first fuel outlet channel, a flow control hole is arranged on the flow control portion, and the cross-sectional area of the flow control hole is smaller than that of the first fuel outlet channel.
Optionally, the injection port is provided in plurality, and the plurality of injection ports are arranged at intervals along the circumferential direction of the body; and/or
The first fuel outlet channel is provided with a plurality of, and a plurality of first fuel outlet channels are arranged along the circumference interval of first fuel reserve chamber.
The beneficial effects of the invention are as follows:
the invention provides a fuel premixing injector which comprises a body, a first fuel injection valve and a second fuel injection valve. The first fuel injection valve is arranged to control the injection of the first fuel in the first fuel storage cavity, the injected first fuel enters the mixing cavity through the first fuel outlet channel, the second fuel injection valve is arranged to control the injection of the fuel in the mixing cavity, and the injected fuel is injected through the injection port. When the fuel premixing injector works, the first fuel and the second fuel are sprayed out of the injection port, and compared with the alternative injection of a gas fuel injection port and a liquid fuel injection port in the prior art, the fuel premixing injector effectively reduces deposits on the injection port, and further reduces the risk of blockage of the injection port.
Through setting up first fuel reserve chamber and mixing chamber intercommunication, and make first fuel get into first fuel reserve chamber, the second fuel gets into the mixing chamber, through controlling first fuel injection entering mixing chamber, and control second fuel input mixing chamber, can control the fuel kind and the mixing ratio in the mixing chamber, and then the fuel that the control injection mouth was sprayed is single fuel or fuel mixture, compare with prior art, can make the fuel mix according to different proportions before the injection, can realize the nimble ratio of first fuel and second fuel, and then realize multiple combustion mode.
Drawings
FIG. 1 is a schematic diagram of a fuel premix injector according to an embodiment of the invention.
In the figure:
110. a first fuel inlet; 120. a second fuel inlet; 130. an ejection port; 140. a first fuel reservoir; 150. a mixing chamber; 160. a first fuel outlet passage;
200. a first fuel injection valve; 210. a first valve body; 220. a first control room; 221. a first liquid inlet; 222. a first liquid outlet; 223. a first elastic member; 224. a first guide bar; 230. a first liquid inlet channel; 231. a first intake orifice; 240. a second liquid inlet channel; 250. a first liquid outlet channel; 251. a first outlet orifice; 260. a second liquid outlet channel; 270. a first fuel injection control valve;
300. a second fuel injection valve; 310. a second valve body; 320. a second control room; 321. a second liquid inlet; 322. a second liquid outlet; 323. a second elastic member; 324. a second guide bar; 330. a third liquid inlet channel; 331. a second intake orifice; 340. a fourth liquid inlet channel; 350. a third liquid outlet channel; 351. a second outlet orifice; 360. a fourth liquid outlet channel; 370. a second fuel injection control valve;
410. a first delivery pipe; 420. a first fuel pump;
510. a second delivery pipe; 520. a second fuel surge tank; 530. a second fuel output valve.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Where the terms "first position" and "second position" are two different positions, and where a first feature is "over", "above" and "on" a second feature, it is intended that the first feature is directly over and obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. "beneath," "under" and "beneath" a first feature includes the first feature being directly beneath and obliquely beneath the second feature, or simply indicating that the first feature is at a lesser elevation than the second feature.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
The invention provides a fuel premixing injector, which is provided with only one injection port 130, reduces the risk of blockage of the injection port 130, and has simple structure and lower cost.
Specifically, as shown in fig. 1, the fuel premix injector includes a body, a first fuel injection valve 200, and a second fuel injection valve 300. The body is provided with a first fuel inlet 110, a second fuel inlet 120 and an injection port 130, the body is provided with a first fuel storage cavity 140 and a mixing cavity 150, the first fuel inlet 110 is communicated with the first fuel storage cavity 140, and first fuel enters the first fuel storage cavity 140 from the first fuel inlet 110. The first fuel may be any fuel that is in a liquid state at standard temperature and pressure, such as diesel, methanol, dimethyl ether, kerosene, and the like. Of course, the first fuel and the second fuel may be both gas fuel or both liquid fuel, and may be selected according to actual needs. The second fuel may be any fuel that is in a gaseous state at standard temperature and pressure, such as ammonia, methane, hydrogen, and nitrogen, among others. The first fuel reservoir 140 is provided with a first fuel outlet passage 160 communicating with the mixing chamber 150, and the first fuel can enter the mixing chamber 150 from the first fuel outlet passage 160. The second fuel inlet 120 and the injection port 130 are communicated with the mixing chamber 150, the second fuel enters the mixing chamber 150 from the second fuel inlet 120, and the first fuel and the second fuel are mixed in the mixing chamber 150 and then are injected from the injection port 130. Of course, it is also possible to inject a single fuel as needed by controlling the first fuel and the second fuel into the mixing chamber 150 such that a single type of fuel is present in the mixing chamber 150.
By arranging that the first fuel, the second fuel or the mixed fuel are all sprayed from the same injection port 130, when the fuel premixing injector works, the injection port 130 keeps the injection state continuously, and carbon dust generated by combustion cannot be accumulated in the injection port 130, so that the risk of blockage of the injection port 130 is reduced. Compared with the prior art in which gas fuel and liquid fuel are sprayed out from different injection ports 130, the fuel premixing injector can inject mixed fuel, the mixing ratio of the first fuel and the second fuel is flexible and adjustable, multiple combustion modes of the engine can be realized, and more use scenes are available.
Further, the first fuel injection valve 200 includes a first valve body 210, a first control chamber 220, a first inlet channel 230, a second inlet channel 240, a first outlet channel 250, a second outlet channel 260, and a first fuel injection control valve 270. The first control chamber 220 is fixed in the body, the first control chamber 220 is provided with a first liquid inlet 221 and a first liquid outlet 222, the first control chamber 220 is provided with a first elastic member 223, and the first valve body 210 is hermetically inserted in the first control chamber 220 and connected with the first elastic member 223. One end of the first inlet passage 230 communicates with the first fuel inlet 110. When the first fuel is a liquid fuel, a part of the liquid fuel entering the first fuel inlet 110 flows into the first inlet passage 230. When the first fuel is a gaseous fuel, liquid may be delivered to the first inlet passage 230 through the first fuel inlet 110. One end of the second liquid inlet channel 240 is communicated with the other end of the first liquid inlet channel 230 through a first throttling part, a first throttling hole 231 is formed in the first throttling part, and the cross-sectional area of the first throttling hole 231 is smaller than that of the first liquid inlet channel 230. The other end of the second liquid inlet channel 240 is communicated with the first liquid inlet 221, the first throttle hole 231 can adjust the liquid flow rate in the second liquid inlet channel 240, and the size of the first throttle hole 231 is set as required. One end of the first liquid outlet channel 250 is communicated with the first liquid outlet 222, and the liquid flows out of the first control chamber 220 through the first liquid outlet channel 250. One end of the second liquid outlet channel 260 is communicated with the first liquid outlet channel 260 through a first throttling part, a first throttling hole 251 is arranged on the first throttling part, and the cross-sectional area of the first throttling hole 251 is smaller than that of the first liquid outlet channel 250. The liquid in the first liquid outlet channel 250 flows into the second liquid outlet channel 260 through the first outlet orifice 251, and the first outlet orifice 251 can control the liquid flow in the second liquid outlet channel 260. The other end of the second liquid outlet channel 260 is connected to a liquid storage device, and the liquid storage device is used for storing the liquid flowing out from the first control chamber 220 and recycling the liquid. The first fuel injection control valve 270 is provided in the second liquid outlet passage 260, and the first fuel injection control valve 270 is an automatic valve and can be opened and closed by a controller. The diameter of the first entrance orifice 231 is smaller than the diameter of the first exit orifice 251.
For ease of understanding, the operation of the first fuel injection valve 200 described above will now be briefly described:
initial state: the liquid continuously enters the first control chamber 220 through the first liquid inlet channel 230 and the second liquid inlet channel 240, the first fuel injection control valve 270 is closed, the liquid in the first control chamber 220 does not flow out, the force of pressing the first valve body 210 downwards in the first control chamber 220 is greater than the upward pressure in the first fuel storage cavity 140, and the first valve body 210 blocks the first fuel outlet channel 160.
If the first fuel outlet passage 160 needs to be opened, the controller controls the first fuel injection control valve 270 to be opened, at this time, since the diameter of the first outlet orifice 251 is larger than that of the first inlet orifice 231, the amount of liquid flowing out of the first control chamber 220 is larger than that of the liquid entering the first control chamber 220, so that the amount of liquid in the first control chamber 220 is reduced, the first elastic member 223 is compressed due to the air pressure, the first valve body 210 moves in the positive direction of the Z axis, and the first fuel outlet passage 160 is opened, so that the first fuel enters the mixing chamber 150.
If the first fuel outlet passage 160 needs to be closed, the controller controls the first fuel injection control valve 270 to close, and at this time, the liquid in the first control chamber 220 gradually increases, so that the force of pressing the first valve body 210 downward in the first control chamber 220 is greater than the upward pressure in the first fuel storage cavity 140, and further, the first elastic member 223 extends to push the first valve body 210 to move in the negative direction of the Z axis, and the first fuel outlet passage 160 is closed.
Since the injection of the first fuel from the first fuel outlet passage 160 is very fast and is about to be completed within about 0.5ms, if the flow rate of the liquid flowing out from the first control chamber 220 is controlled by providing the flow regulating valve, it cannot be completed in such a short time, and the present application achieves the purpose of completing the first fuel injection in a short time by providing the first inlet orifice 231 and the first outlet orifice 251 and by providing the first inlet orifice 231 with a diameter smaller than that of the first outlet orifice 251 to control the amount of the liquid in the first control chamber 220. The diameters of the first inlet throttle hole 231 and the first outlet throttle hole 251 may be set according to actual needs.
Preferably, with continued reference to fig. 1, a first guide rod 224 may be disposed in the first control chamber 220, the first guide rod 224 extending in the Z-axis direction, one end of the first guide rod 224 being connected to the first valve body 210, the first guide rod 224 being slidably connected to a first guide groove in the first control chamber 220. By providing the first guide rod 224, the movement of the first valve body 210 in the Z-axis direction can be guided, and the reliability of the operation of opening and closing the first fuel outlet passage 160 of the first valve body 210 is ensured.
Preferably, the first guide rod 224 is cylindrical, and a plurality of first liquid storage rings are arranged on the circumferential surface of the first guide rod 224, and are arranged at intervals along the length direction of the first guide rod 224. The liquid in the first control chamber 220 can be stored in the first reservoir ring, and a liquid seal is formed between the liquid in the first reservoir ring and the groove wall of the first guide groove, thereby improving the reliability of the operation of the first fuel injection valve 200.
Preferably, the first elastic member 223 can be sleeved outside the first guide rod 224, and the first elastic member 223 is supported by the first guide rod 224, so that the first elastic member 223 can be conveniently mounted, the first elastic member 223 can be prevented from being bent during compression, and the working reliability of the first elastic member 223 can be ensured.
Further, the second fuel injection valve 300 includes a second valve body 310, a second control chamber 320, a third liquid inlet channel 330, a fourth liquid inlet channel 340, a third liquid outlet channel 350, a fourth liquid outlet channel 360 and a second fuel injection valve control valve 370. The second control chamber 320 is fixed in the main body, the second control chamber 320 is provided with a second liquid inlet 321 and a second liquid outlet 322, a second elastic element 323 is arranged in the second control chamber 320, and the second valve body 310 is hermetically inserted in the second control chamber 320 and connected with the second elastic element 323. One end of the third liquid inlet channel 330 communicates with the first fuel inlet 110, and when the first fuel is liquid fuel, a part of the liquid fuel entering the first fuel inlet 110 flows into the third liquid inlet channel 330. When the first fuel is a gaseous fuel, liquid may be delivered to the third liquid inlet channel 330 through the first fuel inlet 110. One end of the fourth liquid inlet channel 340 is communicated with the other end of the third liquid inlet channel 330 through a second liquid inlet throttling part, a second liquid inlet throttling hole 331 is arranged on the second liquid inlet throttling part, and the cross-sectional area of the second liquid inlet throttling hole 331 is smaller than that of the third liquid inlet channel 330. The other end of the fourth liquid inlet passage 340 is communicated with the second liquid inlet 321, the second throttle hole 331 can adjust the liquid flow rate of the fourth liquid inlet passage 340, and the size of the second throttle hole 331 is set as required. One end of the third liquid outlet channel 350 is communicated with the second liquid outlet 322, and the liquid flows out of the second control chamber 320 through the third liquid outlet channel 350. One end of the fourth liquid outlet channel 360 is communicated with the third liquid outlet channel 350 through a second throttling hole 351, liquid in the third liquid outlet channel 350 flows into the fourth liquid outlet channel 360 through the second throttling hole 351, and the flow rate of the liquid in the fourth liquid outlet channel 360 can be controlled through the second throttling hole 351. The other end of the fourth liquid outlet channel 360 is connected to a liquid storage device, and the liquid storage device is used for storing the liquid flowing out of the second control chamber 320 and recycling the liquid. The second fuel injection control valve 370 is disposed on the fourth liquid outlet passage 360, and the second fuel injection control valve 370 is an automatic valve and can be opened and closed by a controller. The diameter of the second inlet orifice 331 is smaller than the diameter of the second outlet orifice 351.
For ease of understanding, the operation of the second fuel injection valve 300 described above will now be briefly described:
an initial state: the liquid continuously enters the second control chamber 320 through the third inlet channel 330 and the fourth inlet channel 340, the second fuel injection control valve 370 is closed, the liquid in the second control chamber 320 does not flow out, the pressure in the second control chamber 320 is higher than the pressure in the mixing cavity 150, and the second valve body 310 is enabled to block the injection port 130.
When the injection port 130 needs to be opened, the controller controls the second fuel injection control valve 370 to be opened, and at this time, since the diameter of the second outlet orifice 351 is larger than that of the second inlet orifice 331, the amount of liquid flowing out of the second control chamber 320 is larger than that of the liquid flowing in, so that the amount of liquid in the second control chamber 320 is reduced, the second elastic member 323 is compressed by the air pressure, the second valve body 310 moves in the positive direction of the Z axis, and the injection port 130 is opened to discharge the fuel.
If the injection port 130 needs to be closed, the controller controls the second fuel injection control valve 370 to close, at this time, the liquid in the second control chamber 320 gradually increases, so that the force pressing the second valve body 310 downwards in the second control chamber 320 is greater than the force pressing the mixing chamber 150 upwards, and further, the second elastic member 323 extends to push the second valve body 310 to move along the negative direction of the Z axis, and the injection port 130 is closed.
Since the fuel injection from the injection port 130 is very fast and is completed within about 0.5ms, if the flow rate of the liquid flowing out from the second control chamber 320 is controlled by the flow rate adjusting valve, the fuel injection cannot be completed in such a short time, and the present invention achieves the purpose of completing the fuel injection in a short time by providing the second inlet orifice 331 and the second outlet orifice 351, and by setting the diameter of the second inlet orifice 331 to be smaller than the diameter of the second outlet orifice 351 to control the amount of the liquid in the second control chamber 320. The diameters of the second inlet throttle hole 331 and the second outlet throttle hole 351 can be set according to actual needs.
Preferably, with continued reference to fig. 1, a second guide rod 324 may be provided in the second control chamber 320, the second guide rod 324 extending in the Z-axis direction, one end of the second guide rod 324 being connected to the second valve body 310, the second guide rod 324 being slidably connected to a second guide groove in the second control chamber 320. By providing the second guide rod 324, it is possible to guide the movement of the second valve body 310 in the Z-axis direction, and to ensure the reliability of the operation of opening and closing the injection port 130 of the second valve body 310.
Preferably, the second guide rod 324 is cylindrical, a plurality of second liquid storage rings are disposed on the circumferential surface of the second guide rod 324, and the plurality of second liquid storage rings are spaced along the length direction of the second guide rod 324. The liquid in the second control chamber 320 can be stored in the second liquid storage ring, and a liquid seal is formed between the liquid in the second liquid storage ring and the groove wall of the second guide groove, so that the working reliability of the second fuel injection valve 300 is improved.
Preferably, the second elastic member 323 can be sleeved outside the second guide rod 324, and the second elastic member 323 is supported by the second guide rod 324, so that the second elastic member 323 can be conveniently installed, the second elastic member 323 can be prevented from being bent during compression, and the working reliability of the second elastic member 323 can be ensured.
Further, in one embodiment, the first fuel reservoir 140 and the mixing chamber 150 are disposed side-by-side. In another embodiment, the body is a split stack configuration with the first fuel reservoir 140 above the mixing chamber 150. In other embodiments, the first fuel reservoir 140 may be disposed in the second valve body 310, and the first valve body 210 may be disposed in the second valve body 310, so that the gas-liquid fuel premixing injector may have a compact structure and a reduced size compared to the case where the first fuel reservoir 140 and the mixing chamber 150 are disposed side by side.
Preferably, the first fuel outlet passage 160 is provided with a flow control portion, which is provided with a flow control hole having a cross-sectional area smaller than that of the first fuel outlet passage. By providing the flow control hole, the pressure of the first fuel can be controlled, and in order to ensure that the first fuel in the first fuel storage chamber 140 can smoothly enter the mixing chamber 150, it is necessary to ensure that the pressure in the first fuel storage chamber 140 is greater than the pressure in the mixing chamber 150.
Preferably, in one embodiment, the injection port 130 is provided in plurality, and the plurality of injection ports 130 are arranged at intervals in the circumferential direction of the body. In another embodiment, the first fuel outlet passage 160 is provided in plurality, and the plurality of first fuel outlet passages 160 are spaced apart along the circumference of the first fuel reservoir 140. In other embodiments, the injection port 130 and the first fuel outlet passage 160 are provided in plurality, and may be provided as needed.
Further, the fuel premix injector described above further comprises a first fuel delivery assembly comprising a first delivery tube 410 and a first fuel pump 420. Wherein the first fuel enters from one end of the first delivery pipe 410 and exits from the other end of the first delivery pipe 410, the other end of the first delivery pipe communicates with the first fuel inlet 110, and the first fuel pump 430 is provided on the first delivery pipe 410 for powering the delivery of the first fuel.
Further, the fuel premixing injector described above further includes a second fuel delivery assembly including a second delivery pipe 510, a second fuel surge tank 520, and a second fuel output valve 530. Wherein the second fuel enters from one end of second delivery pipe 510 and exits from the other end of second delivery pipe 510, the other end of second delivery pipe 510 communicates with second fuel inlet 120, second fuel surge tank 520 communicates with one end of second delivery pipe 510, and the second fuel surge tank 520 stores the stabilized second fuel therein. The second fuel output valve 530 is disposed on the second delivery pipe 510, the second fuel output valve 530 is an automatic control valve, and the controller can control the opening and closing of the second fuel output valve 530 to control the input of the second fuel.
In the present embodiment, by providing the mixing chamber 150 and communicating the injection port 130 with the mixing chamber 150, multiple combustion modes of the engine can be realized, and the multiple combustion modes can be, but are not limited to, the following combustion modes (taking the first fuel as a liquid fuel and the second fuel as a gaseous fuel as examples):
combustion mode one (mainly gaseous fuel combustion): in the later stage of the compression stroke of the engine, the first fuel injection valve 200 is opened to allow the liquid fuel to enter the mixing chamber 150 to form a mixed fuel with the gas in the mixing chamber 150, and then the second fuel injection valve 300 is opened to allow the gas-liquid mixed fuel to enter the combustion chamber of the cylinder as a pilot fuel and be compressed and ignited. After the gas-liquid mixed fuel establishes a suitable pilot condition, the second fuel injection valve 300 controls the gas fuel to be injected again or more times, so that the gas fuel enters the combustion chamber of the cylinder, and single injection and multiple injection in the main injection period are realized. This injection pattern, with only one set of injection ports 130 in contact with the cylinder combustion chamber, is different from a conventional dual fuel injector that uses two separate injection ports 130. The gas-liquid fuel premixing injector provided by the application has the advantages that the single fuel or the gas-liquid mixed fuel always erodes the injection port 130 in the whole combustion period, and along with the operation of an engine, compared with a transmission dual-fuel injector, the deposit deposited on the injection port 130 is greatly reduced, the risk of blockage of the injection port 130 is reduced, and the working reliability of the fuel premixing injector is improved. The requirement for liquid fuel injection is reduced by means of gas-liquid mixed fuel injection. In general, liquid fuel injection is performed, and the atomization performance of the liquid fuel can be changed only by increasing the injection pressure. However, according to the fuel premixing injector provided by the application, the gas fuel can assist the liquid fuel to be atomized, so that the liquid fuel can keep better atomization performance under lower pressure.
Further, in the first combustion mode, the pressure of the liquid fuel in the first fuel storage chamber 140 is required to be always higher than the pressure of the gas fuel in the mixing chamber 150, for example, the pressure of the liquid fuel in the mixing chamber 150 is higher than the pressure of the gas fuel in the first fuel storage chamber 140 by 50bar, so as to ensure that the liquid fuel can only enter the mixing chamber 150 from the first fuel outlet passage 160 in one direction when the first fuel injection valve 200 is opened, which can improve the lubrication of the mating parts and prevent the blow-by of the mating parts.
Combustion mode two (with pilot injection): the method comprises the steps of pre-spraying gas-liquid mixed fuel, and then carrying out multiple main spraying of the gas-liquid mixed fuel. In this combustion mode, both gaseous and liquid fuels participate in the combustion.
Combustion mode three (gas medium does not participate in combustion): the added gas fuel is nitrogen, and the gas fuel does not participate in combustion and only plays a role in assisting the atomization of the liquid fuel.
Combustion mode four (no pilot injection): by adjusting the proportion of the gas fuel and the liquid fuel, the gas-liquid mixed fuel is always injected, so that the gas-liquid fuel combustion of the engine is realized under the dual-fuel supply, and the engine always keeps high-efficiency operation.
The fuel premixing injector provided by the invention has the advantages that the number of connecting pipelines is small, high injection pressure is not needed, the reliability of a system is improved, and the cost is low.
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. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. 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 (10)
1. A fuel premix injector, characterized by comprising:
the fuel injection device comprises a body, wherein a first fuel inlet (110), a second fuel inlet (120) and an injection port (130) are formed in the body, a first fuel storage cavity (140) and a mixing cavity (150) are formed in the body, the first fuel inlet (110) is communicated with the first fuel storage cavity (140), the second fuel inlet (120) and the injection port (130) are both communicated with the mixing cavity (150), and a first fuel outlet channel (160) communicated with the mixing cavity (150) is formed in the first fuel storage cavity (140);
a first fuel injection valve (200) disposed within the first fuel reservoir (140), the first fuel injection valve (200) configured to control opening and closing of the first fuel outlet passage (160);
a second fuel injection valve (300) disposed in the mixing chamber (150), the first fuel injection valve (200) being configured to control opening and closing of the injection port (130).
2. The fuel premix injector of claim 1, characterized in that the first fuel injection valve (200) comprises:
a first valve body (210);
the fuel injection valve comprises a first control chamber (220) fixed in the body, wherein a first liquid inlet (221) and a first liquid outlet (222) are formed in the first control chamber (220), a first elastic piece (223) is arranged in the first control chamber (220), a first valve body (210) penetrates through the first control chamber (220) in a sealing mode and is connected with the first elastic piece (223), and the first valve body (210) can move along the Z-axis direction to block or open a first fuel outlet channel (160);
a first inlet channel (230), one end of the first inlet channel (230) being in communication with the first fuel inlet (110);
one end of the second liquid inlet channel (240) is communicated with the other end of the first liquid inlet channel (230) through a first liquid inlet throttling part, a first liquid inlet throttling hole (231) is formed in the first liquid inlet throttling part, the cross-sectional area of the first liquid inlet throttling hole (231) is smaller than that of the first liquid inlet channel (230), and the other end of the second liquid inlet channel (240) is communicated with the first liquid inlet (221);
a first liquid outlet channel (250), wherein one end of the first liquid outlet channel (250) is communicated with the first liquid outlet (222);
one end of the second liquid outlet channel (260) is communicated with the other end of the first liquid outlet channel (250) through a first throttling outlet part, a first throttling outlet (251) is arranged on the first throttling outlet part, and the cross-sectional area of the first throttling outlet (251) is smaller than that of the first liquid outlet channel (250);
a first fuel injection control valve (270) provided on the second liquid outlet passage (260);
the diameter of the first inlet orifice (231) is smaller than the diameter of the first outlet orifice (251).
3. The fuel premix injector of claim 2, characterized in that a first guide rod (224) is provided in said first control chamber (220), said first guide rod (224) extending in said Z-axis direction, one end of said first guide rod (224) being connected to said first valve body (210), said first guide rod (224) being slidably connected to a first guide groove in said first control chamber (220).
4. The fuel premix injector of claim 3, wherein the first guide rod (224) is cylindrical, and a plurality of first liquid reservoir rings are provided on a circumferential surface of the first guide rod (224).
5. The fuel premix injector of claim 2, characterized in that the second fuel injection valve (300) comprises:
a second valve body (310);
the second control chamber (320) is fixed in the body, a second liquid inlet (321) and a second liquid outlet (322) are formed in the second control chamber (320), a second elastic piece (323) is arranged in the second control chamber (320), the second valve body (310) is hermetically arranged in the second control chamber (320) in a penetrating mode and connected with the second elastic piece (323), and the second valve body (310) can move along the Z-axis direction to close or open the jet orifice (130);
a third liquid inlet passage (330), one end of the third liquid inlet passage (330) being communicated with the first fuel inlet (110);
one end of the fourth liquid inlet channel (340) is communicated with the other end of the third liquid inlet channel (330) through a second liquid inlet throttling part, a second liquid inlet throttling hole (331) is formed in the second liquid inlet throttling part, the cross-sectional area of the second liquid inlet throttling hole (331) is smaller than that of the third liquid inlet channel (330), and the other end of the fourth liquid inlet channel (340) is communicated with the second liquid inlet (321);
a third liquid outlet channel (350), wherein one end of the third liquid outlet channel (350) is communicated with the second liquid outlet (322);
one end of the fourth liquid outlet channel (360) is communicated with the other end of the third liquid outlet channel (350) through a second throttling outlet part, a second throttling outlet (351) is formed in the second throttling outlet part, and the cross sectional area of the second throttling outlet (351) is smaller than that of the third liquid outlet channel (350);
a second fuel injection control valve (370) provided on the fourth liquid outlet passage (360);
the diameter of the second inlet orifice (331) is smaller than the diameter of the second outlet orifice (351).
6. The fuel premix injector of claim 5, characterized in that a second guide rod (324) is disposed in the second control chamber (320), the second guide rod (324) extends in the Z-axis direction, one end of the second guide rod (324) is connected to the second valve body (310), and the second guide rod (324) is slidably connected to a second guide groove in the second control chamber (320).
7. The fuel premix injector of claim 6, wherein the second guide rod (324) is cylindrical, and a plurality of second liquid rings are provided on a circumferential surface of the second guide rod (324).
8. The fuel premix injector of claim 5, characterized in that the first fuel reservoir (140) is disposed within the second valve body (310);
or the body is of a split and overlapped structure.
9. The fuel premix injector of any of claims 1 to 8, characterized in that a flow control portion is provided on the first fuel outlet passage (160), and a flow control hole having a cross-sectional area smaller than a cross-sectional area of the first fuel outlet passage (160) is provided on the flow control portion.
10. The fuel premix injector as in any of claims 1-8, characterized in that said injection port (130) is provided in plurality, and a plurality of said injection ports (130) are provided at intervals along a circumferential direction of said body; and/or
The first fuel outlet passage (160) is provided in plurality, and the plurality of first fuel outlet passages (160) are arranged at intervals in the circumferential direction of the first fuel reservoir (140).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210785396.XA CN115095459B (en) | 2022-07-04 | 2022-07-04 | Fuel premixing injector |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210785396.XA CN115095459B (en) | 2022-07-04 | 2022-07-04 | Fuel premixing injector |
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| JP2000249015A (en) * | 1999-02-26 | 2000-09-12 | Nissan Motor Co Ltd | Fuel injection device for gasoline self-ignition internal combustion engine |
| JP2010168911A (en) * | 2009-01-20 | 2010-08-05 | Denso Corp | Fuel injection valve |
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| CN103987952A (en) * | 2011-10-24 | 2014-08-13 | 卡特彼勒公司 | Dual fuel injector with hydraulic lock seal and liquid leak purge strategy |
| US20160108874A1 (en) * | 2013-05-21 | 2016-04-21 | Westport Power Inc. | Fuel injector |
| CN106762276A (en) * | 2017-01-05 | 2017-05-31 | 江苏大学 | A kind of new dual fuel injector of cavitation prevention and common rail fuel system |
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2022
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000249015A (en) * | 1999-02-26 | 2000-09-12 | Nissan Motor Co Ltd | Fuel injection device for gasoline self-ignition internal combustion engine |
| CN102105673A (en) * | 2008-06-27 | 2011-06-22 | 西港能源有限公司 | Fuel injection valve and method for co-injecting a liquid and a gaseous fuel into the combustion chamber of an internal combustion engine |
| JP2010168911A (en) * | 2009-01-20 | 2010-08-05 | Denso Corp | Fuel injection valve |
| CN103987952A (en) * | 2011-10-24 | 2014-08-13 | 卡特彼勒公司 | Dual fuel injector with hydraulic lock seal and liquid leak purge strategy |
| US20160108874A1 (en) * | 2013-05-21 | 2016-04-21 | Westport Power Inc. | Fuel injector |
| CN106762276A (en) * | 2017-01-05 | 2017-05-31 | 江苏大学 | A kind of new dual fuel injector of cavitation prevention and common rail fuel system |
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| CN115095459B (en) | 2024-01-02 |
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