CN111005824A - Intensified flow-guiding type large-flow injection device of gas fuel engine - Google Patents
Intensified flow-guiding type large-flow injection device of gas fuel engine Download PDFInfo
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- CN111005824A CN111005824A CN201911323464.5A CN201911323464A CN111005824A CN 111005824 A CN111005824 A CN 111005824A CN 201911323464 A CN201911323464 A CN 201911323464A CN 111005824 A CN111005824 A CN 111005824A
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- gas nozzle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
- F02M21/0248—Injectors
- F02M21/0278—Port fuel injectors for single or multipoint injection into the air intake system
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/30—Use of alternative fuels, e.g. biofuels
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
The invention aims to provide a reinforced flow guide type large-flow injection device of a gas fuel engine, which comprises a cylinder cover, a cylinder wall, a piston, an air inlet channel, a gas injection valve and a gas nozzle, wherein the cylinder cover is positioned above the cylinder wall; the tail end of the gas nozzle is circumferentially provided with spray holes, the spray holes distributed on the same circumference at the tail end of the gas nozzle are a group of spray holes, and each group of spray holes are uniformly distributed along the circumference; the tip portion of the gas nozzle is thickened to reduce the diameter-depth ratio of the nozzle hole. The invention can not only realize the strengthening of the gas diversion function of the multi-hole injection nozzle, but also meet the requirements of different working conditions and different emission performance of the engine through different spray hole arrangement schemes.
Description
Technical Field
The invention relates to a fuel injection device, in particular to a gas fuel engine injection device.
Background
With the increasing severity of energy crisis and environmental pollution, engine manufacturers at home and abroad are actively researching and developing various energy-saving emission-reducing technologies. Natural gas is a promising alternative energy source due to its advantages of wide source, high calorific value, less emission pollution and the like. The lean combustion technology can reduce the intake throttling loss, can adopt a higher compression ratio, and has a lower combustion temperature, so that the engine generates higher thermal efficiency and lower NOx emission, and the lean combustion technology becomes an important technical measure for realizing energy conservation and emission reduction of the engine. For the natural gas engine with the side wall punching type gas nozzle with the porous structure, if the nozzle of the natural gas engine with large-flow injection is not thickened, the diameter of the gas inlet spray hole is large, and the thickening treatment is not carried out at the position of the spray hole, so that the diameter-depth ratio of the spray hole is high, the gas spray hole cannot play a good gas diversion role, the distribution of mixed gas in a cylinder is not ideal, and the dynamic property and the economical efficiency of the engine are influenced.
At present, a natural gas engine gas inlet multi-point injection system, for example, "multi-point injection natural gas engine gas injection conduit assembly" with patent number CN207145087U, discloses a natural gas engine gas injection device, wherein one of the features is: the air outlet end of the injection conduit is sealed, a plurality of injection holes are formed in the side face of the pipe body of the air outlet end of the injection conduit, and the plurality of injection holes are uniformly distributed along the circumferential direction of the injection conduit. The purpose of this structure is to change the jet orifice of injection pipe into a plurality of side openings by one and spray, the more effectual homogeneity that has improved the gas mixture, thereby the engine performance has been improved, but this device only is applicable to the natural gas engine of little discharge aperture, need spray a large amount of natural gases when the engine can hinder the intake efficiency of natural gas because the aperture undersize, if the size that changes the orifice improves this condition, can be because the degree of depth and the jet orifice diameter ratio of jet orifice are too little, the jet orifice can not play better gas water conservancy diversion effect, thereby influence the quality of natural gas and air mixture, and then influence the quality of natural gas burning in the jar.
Disclosure of Invention
The invention aims to provide a reinforced diversion type large-flow injection device of a gas fuel engine, which can improve the combustion quality of the engine and reduce the NOx emission of the engine.
The purpose of the invention is realized as follows:
the invention relates to a reinforced flow guide type large-flow injection device of a gas fuel engine, which is characterized in that: the gas injection valve is positioned outside the gas inlet channel, and the gas nozzle is connected with the gas injection valve through a gas guide pipe; the tail end of the gas nozzle is circumferentially provided with spray holes, the spray holes distributed on the same circumference at the tail end of the gas nozzle are a group of spray holes, and each group of spray holes are uniformly distributed along the circumference; the tip portion of the gas nozzle is thickened to reduce the diameter-depth ratio of the nozzle hole.
The present invention may further comprise:
1. the angle formed by the axis of each spray hole of each group of spray holes and the central axis of the gas nozzle is consistent, and the included angle ranges from 30 degrees to 90 degrees.
2. The axis of each spray hole is intersected with the axis of the gas nozzle, the sum of the areas of all the spray holes is 1.2 times to 1.8 times of the area of the gas inlet hole of the gas nozzle, and the diameter of each spray hole is smaller than one third of the inner diameter of the gas nozzle.
3. The included angle between the axis of the spray hole close to the tail end of the gas nozzle and the axis of the gas nozzle is 90 degrees, and the included angle between the axis of a group of spray holes far away from the tail end of the gas nozzle and the axis of the gas nozzle is 45 degrees.
4. The orifice include three groups, three group's orifice axes are 90 degrees with gas nozzle axis contained angle, three group's orifice diameters are 4 from being close to gas nozzle terminal to keeping away from the terminal proportion in the direction of gas nozzle: 2: 1.
the invention has the advantages that: the invention not only can realize the function of strengthening the gas diversion of the porous injection nozzle and improve the mixing condition of gas and air in the cylinder, thereby improving the combustion quality of the engine and simultaneously reducing the NOx emission of the engine, but also can meet the requirements of different working conditions and different emission properties of the engine through different spray hole arrangement schemes.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2a is a schematic view of a gas nozzle arrangement with two sets of nozzle holes near the end of the nozzle tube having an included angle of 90 degrees with the axis of the nozzle tube and one set of nozzle holes far from the end of the nozzle tube having an included angle of 45 degrees with the axis of the nozzle tube, and FIG. 2b is a cross-sectional view of FIG. 2 a;
fig. 3a shows that the included angles between the axes of the three groups of spray holes of the gas nozzle and the axis of the spray pipe are all 90 degrees, and the ratio of the diameters of the three groups of spray holes from the end close to the spray pipe to the end far away from the spray pipe is 4: 2: 1, and fig. 3b is a sectional view of the graph a;
FIG. 4 is a schematic view of a spray hole arrangement scheme in which 3 groups of spray holes are processed at the thickened part of the nozzle, 3 spray holes are respectively arranged at the periphery of the pipe at intervals of 120 degrees in each group, and two adjacent groups of spray holes are staggered in the axial direction of the spray pipe by 40 degrees;
fig. 5 is a side view of the gas burner.
Detailed Description
The invention will now be described in more detail by way of example with reference to the accompanying drawings in which:
with reference to fig. 1-5, the invention comprises an air inlet manifold 10, a cylinder cover 9, a gas injection valve 1, a gas guide pipe 2 and a gas nozzle 3, wherein the gas nozzle 3 is connected with the gas injection valve 1 through the gas guide pipe 2, the gas nozzle 3 extends into the air inlet manifold, the pipe wall near the tail end of the gas injection pipe is thickened, a plurality of groups of injection holes are processed at the thickened part, the center of each group of injection holes is uniformly distributed along the circumference of the pipe wall, each group of injection holes consists of a plurality of injection holes, the nozzle is thickened to reduce the diameter-depth ratio of the injection holes, so that each injection hole has better diversion effect, the gas nozzle 3 is of a porous structure, the air injection jet flow can penetrate through the gap between the air inlet valve and the valve seat to directly enter the cylinder during the opening of the air inlet valve, and quick air inlet is realized; the difference of flow characteristics of gas fuel in the double air inlet channels entering the cylinder and the nonuniformity of gas concentration distribution in the double air inlet channels are realized by different spray hole arrangement schemes, layered mixed gas with a certain concentration gradient is formed in the cylinder, and a spark plug is controlled to ignite the layered mixed gas in the cylinder at proper time, so that the purpose of improving the combustion of the mixed gas in the cylinder is achieved.
The thickening treatment at the nozzle can be realized by adding a layer of outer wall on the original spray pipe through a thread structure, or directly processing the spray pipe with a thickened tail end.
And the angles formed by the axes of all the spray holes in each group of spray holes and the central axis of the spray pipe are consistent along the spray holes in the circumferential direction of the spray pipe, and the included angle ranges from 30 degrees to 90 degrees. The air outlet directions of different groups of spray holes can be the same or different.
The axial line of each spray hole on the spray pipe is intersected with the axial line of the gas spray pipe, the sum of the areas of all the spray holes is 1.2 times to 1.8 times of the area of the air inlet hole of the spray pipe, and the diameter of each spray hole is smaller than one third of the inner diameter of the spray pipe. The depth to diameter ratio of the orifice is between 1.2 and 2.
The gas is sprayed into the spray pipe by the gas jet valve and is sprayed out from the spray holes at the tail end of the spray pipe, and because the spray holes in each group of spray holes are uniformly distributed along the circumference of the spray pipe, the axes of the spray holes in the same group are positioned in a plane, and the plane formed by the axes of the spray holes in each group is uniformly distributed along the axial direction of the spray pipe.
The material of the air inlet nozzle can be stainless steel or aluminum alloy.
The gas nozzle of the natural gas engine can adopt the spray hole arrangement mode shown in the figures 3 and 4 when the engine is in a high-load working condition, the gas injection valve 1 is opened in the period of 10-35 CA after the inlet valve is opened, the gas is injected into the air inlet channel through the gas nozzle through the gas guide pipe 2, the natural gas and the air can be mixed to a certain degree through collision before entering the cylinder by adopting the two arrangement schemes, the ignition timing of the spark plug is controlled in the range of 10-20 CA before the top dead center of the piston, the mixed gas in the cylinder is homogenized in a large range at the moment, and is layered with local small concentration gradient, the homogeneous layered combustion with small concentration gradient not only ensures the rapid propagation of flame in the cylinder, improves the working efficiency of the engine, but also can effectively reduce the emission of the engine under the high-load working condition.
When the engine is in a medium-low load working condition, the gas nozzle of the natural gas engine can adopt a spray hole arrangement scheme shown in the figure II, the gas injection valve 1 is opened in the period of 45-55 CA after the inlet valve is opened, and the gas is injected into the air inlet channel through the gas nozzle through the gas guide pipe 2.
Claims (9)
1. A gas fuel engine intensification diversion type large flow injection device is characterized in that: the gas injection valve is positioned outside the gas inlet channel, and the gas nozzle is connected with the gas injection valve through a gas guide pipe; the tail end of the gas nozzle is circumferentially provided with spray holes, the spray holes distributed on the same circumference at the tail end of the gas nozzle are a group of spray holes, and each group of spray holes are uniformly distributed along the circumference; the tip portion of the gas nozzle is thickened to reduce the diameter-depth ratio of the nozzle hole.
2. The enhanced flow guiding type large flow injection device of the gas fuel engine according to claim 1, which is characterized in that: the angle formed by the axis of each spray hole of each group of spray holes and the central axis of the gas nozzle is consistent, and the included angle ranges from 30 degrees to 90 degrees.
3. The intensified flow guiding type large flow injection device of the gaseous fuel engine according to claim 1 or 2, characterized in that: the axis of each spray hole is intersected with the axis of the gas nozzle, the sum of the areas of all the spray holes is 1.2 times to 1.8 times of the area of the gas inlet hole of the gas nozzle, and the diameter of each spray hole is smaller than one third of the inner diameter of the gas nozzle.
4. The intensified flow guiding type large flow injection device of the gaseous fuel engine according to claim 1 or 2, characterized in that: the included angle between the axis of the spray hole close to the tail end of the gas nozzle and the axis of the gas nozzle is 90 degrees, and the included angle between the axis of a group of spray holes far away from the tail end of the gas nozzle and the axis of the gas nozzle is 45 degrees.
5. The intensified flow-guiding large-flow injection device of the gas fuel engine according to claim 3, characterized in that: the included angle between the axis of the spray hole close to the tail end of the gas nozzle and the axis of the gas nozzle is 90 degrees, and the included angle between the axis of a group of spray holes far away from the tail end of the gas nozzle and the axis of the gas nozzle is 45 degrees.
6. The intensified flow guiding type large flow injection device of the gaseous fuel engine according to claim 1 or 2, characterized in that: the orifice include three groups, three group's orifice axes are 90 degrees with gas nozzle axis contained angle, three group's orifice diameters are 4 from being close to gas nozzle terminal to keeping away from the terminal proportion in the direction of gas nozzle: 2: 1.
7. the intensified flow-guiding large-flow injection device of the gas fuel engine according to claim 3, characterized in that: the orifice include three groups, three group's orifice axes are 90 degrees with gas nozzle axis contained angle, three group's orifice diameters are 4 from being close to gas nozzle terminal to keeping away from the terminal proportion in the direction of gas nozzle: 2: 1.
8. the intensified flow-guiding large-flow injection device of the gaseous fuel engine according to claim 4, characterized in that: the orifice include three groups, three group's orifice axes are 90 degrees with gas nozzle axis contained angle, three group's orifice diameters are 4 from being close to gas nozzle terminal to keeping away from the terminal proportion in the direction of gas nozzle: 2: 1.
9. the intensified flow-guiding large-flow injection device of the gaseous fuel engine according to claim 5, characterized in that: the orifice include three groups, three group's orifice axes are 90 degrees with gas nozzle axis contained angle, three group's orifice diameters are 4 from being close to gas nozzle terminal to keeping away from the terminal proportion in the direction of gas nozzle: 2: 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911323464.5A CN111005824A (en) | 2019-12-20 | 2019-12-20 | Intensified flow-guiding type large-flow injection device of gas fuel engine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911323464.5A CN111005824A (en) | 2019-12-20 | 2019-12-20 | Intensified flow-guiding type large-flow injection device of gas fuel engine |
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| CN111005824A true CN111005824A (en) | 2020-04-14 |
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| CN201911323464.5A Pending CN111005824A (en) | 2019-12-20 | 2019-12-20 | Intensified flow-guiding type large-flow injection device of gas fuel engine |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114233528A (en) * | 2021-12-01 | 2022-03-25 | 漫索(苏州)控制系统有限公司 | Gas nozzle |
| CN114856869A (en) * | 2022-05-30 | 2022-08-05 | 淄柴机器有限公司 | Dual-fuel engine gas branch pipe and dual-fuel engine |
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| CN101382109A (en) * | 2007-12-05 | 2009-03-11 | 奇瑞汽车股份有限公司 | Fuel injector and intake duct for directly jetting diesel engine |
| CN101545418A (en) * | 2009-05-07 | 2009-09-30 | 哈尔滨工程大学 | Gas jet device of electric control jet lean-burn natural gas engine and jet control method |
| CN201517770U (en) * | 2009-08-10 | 2010-06-30 | 北京兴达奇热工控制设备有限公司 | Improved gas burner for industrial furnace |
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| DE102015223601A1 (en) * | 2015-11-27 | 2017-06-01 | Robert Bosch Gmbh | Inlet passage means |
| CN110318911A (en) * | 2019-06-26 | 2019-10-11 | 哈尔滨工程大学 | A kind of natural gas engine gas injection apparatus with fountain nozzle arrangements |
-
2019
- 2019-12-20 CN CN201911323464.5A patent/CN111005824A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101382109A (en) * | 2007-12-05 | 2009-03-11 | 奇瑞汽车股份有限公司 | Fuel injector and intake duct for directly jetting diesel engine |
| CN101545418A (en) * | 2009-05-07 | 2009-09-30 | 哈尔滨工程大学 | Gas jet device of electric control jet lean-burn natural gas engine and jet control method |
| CN201517770U (en) * | 2009-08-10 | 2010-06-30 | 北京兴达奇热工控制设备有限公司 | Improved gas burner for industrial furnace |
| CN104533675A (en) * | 2014-11-14 | 2015-04-22 | 宁波中策动力机电集团有限公司 | Fuel gas air-fuel ratio control device |
| CN104775952A (en) * | 2015-05-05 | 2015-07-15 | 吉林大学 | Dual-fuel engine inlet 45-degree four-hole spray pipe |
| DE102015223601A1 (en) * | 2015-11-27 | 2017-06-01 | Robert Bosch Gmbh | Inlet passage means |
| CN110318911A (en) * | 2019-06-26 | 2019-10-11 | 哈尔滨工程大学 | A kind of natural gas engine gas injection apparatus with fountain nozzle arrangements |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114233528A (en) * | 2021-12-01 | 2022-03-25 | 漫索(苏州)控制系统有限公司 | Gas nozzle |
| CN114233528B (en) * | 2021-12-01 | 2024-01-05 | 漫索(苏州)控制系统有限公司 | Gas nozzle |
| CN114856869A (en) * | 2022-05-30 | 2022-08-05 | 淄柴机器有限公司 | Dual-fuel engine gas branch pipe and dual-fuel engine |
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Application publication date: 20200414 |
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| RJ01 | Rejection of invention patent application after publication |