CN101603476B - Gas supply system of natural gas single-fuel engine - Google Patents
Gas supply system of natural gas single-fuel engine Download PDFInfo
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- CN101603476B CN101603476B CN2008100447109A CN200810044710A CN101603476B CN 101603476 B CN101603476 B CN 101603476B CN 2008100447109 A CN2008100447109 A CN 2008100447109A CN 200810044710 A CN200810044710 A CN 200810044710A CN 101603476 B CN101603476 B CN 101603476B
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- supply 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
Abstract
The invention discloses a gas supply system of a natural gas single-fuel engine. The gas supply system supplies air and fuel gas to an engine, the air passes through an air filter and enters a waste gas turbo pressurizer; the air enters an intercooler from an air outlet after being pressurized; the intercooled air enters a mixer; the fuel gas is a compressed natural gas; a high-pressure natural gas stored in a steel bottle is decompressed by a first class decompressor and connected to a stop valve, a second class decompressor, a third class decompressor till the last class decompressor by a pipeline to form a final class decompressor; the air outlet end of the last class decompressor is communicated with the air inlet end of the air mixer; two gases are supplied to a combustion chamber ofan engine cylinder after being fully mixed in the mixer; and the intercooled air pressurized by a turbo mainly enters the mixer (5) and is also communicated with the last class decompressor of the fuel gas by a balance tube (14). The system can automatically adjust the differential pressure between the mixed fuel gas and the air and ensure the differential pressure to be in a constant value range, thereby mixing the fuel gas and the air in a best proportion.
Description
Technical field
The present invention relates generally to a kind of explosive motor, particularly a kind of motor that uses fuelled with natural gas.
Background technique
Because fuel oil such as prices such as gasoline, diesel oil that explosive motor uses rise steadily, people transfer the research natural gas engine, so that utilize the natural gas resource of China better; Once applied for a Chinese invention patent like our company, name is called " supercharging engine with gas as single fuel ", and number of patent application is 2005100223208; A gas mixer is disclosed; Utilize mixing arrangement to be the motor air feed,, the patent of not only our company application of mixer apparatus is arranged to replace traditional EFI formula plenum system; Like Chinese invention patent; Name is called " mixer for natural gas in use for engine ", application number 200510018722.0, and the application people is a DongFeng Automobile Co., Ltd; China's utility application, name is called " gas-fueled vehicles engine gas mixer ", and the application people is a Nanchong Machinery Factory, Sichuan Petroleum Administration.Above-mentioned patent provides gas mixer miscellaneous, and total trend is that all utilize the explosive motor of fuelled with natural gas; An air supply system is arranged, said air supply system supply engine air and combustion gas, air passes through air filter; Get into exhaust-gas turbocharger, get into intercooler after the supercharging from the air outlet, in air after cold get into mixer; Said combustion gas is a compressed natural gas, and the high-pressure natural gas that steel cylinder stores is connected to stop valve by the road through the decompression of one-level decompressor; To the second depressurized device, to three grades of decompressors ..., afterbody forms last stage pressure reducers, and the gas of last stage pressure reducers goes out end and communicates with an inlet end of described gas mixer; Two kinds of gases fully mix the firing chamber of back supply engine cylinder in mixer, but such system can't regulate required mixed gas automatically according to the needs of engine operating condition, for addressing this problem; People have designed the Ecu system and have come to regulate automatically the combustion gas that gets into cylinder, but such system can't guarantee that also mixed gas obtains the mixing of optimal proportion, and motor can not all obtain best combustion gas and Air mixing ratio all the time; Thereby obtain maximum exerting oneself, all known mixer structures all will solve, and how even be that two kinds of gases mix, but the combustion gas of not noting participating in mixing and the pressure changing of air; Pressure is relevant with flow; The pressure difference that exist of two kinds of gas particularly, therefore, present system is defective.
Summary of the invention
The purpose of this invention is to provide an engine air supply systems; Said system can overcome the shortcoming of prior art; Automatically regulate the combustion gas of participation mixing and the pressure reduction of air; Guarantee pressure reduction in a steady state value scope, thereby combustion gas and air are mixed with optimal proportion, guarantee that motor obtains optimum condition.
Be to realize above-mentioned purpose, scheme of the present invention is: through turbosupercharging and in air after cold mainly get into mixer, also communicate with the last stage pressure reducers of combustion gas through a balance tube.
Further scheme comprises that the air inlet end with balance tube and gas mixer joins, and the other end of said pipe communicates with last stage pressure reducers.
Adopt such scheme, the air supply system of known technology is become one has the self-regulating control system of feedback quantity, and this system can provide best combustion gas and Air mixing gas according to the operating mode needs of motor, thereby has realized the object of the invention.
Below in conjunction with diagram and embodiment scheme of the present invention is done more detailed explanation.
Description of drawings
Fig. 1 is the flow chart of the air supply system of gas as single fuel motor;
Fig. 2 is the parts connection diagram of the air supply system of gas as single fuel motor;
Fig. 3 is the structural drawing of reponse system among Fig. 2.
Embodiment
In the system block diagram as shown in Figure 1, the steel cylinder high-pressure natural gas gets into 2 → three grades of decompressors 3 of high pressure relief device 1 → second depressurized device by the road ... Last stage pressure reducers 4 is connected to a steam supply valve 13 between the last stage pressure reducers 4 entering mixers 5; Another route air entering waste gas charging turbine 6 → through intercooler 7 cooling → entering mixers 5; The outlet side of mixer 5 gets into cylinder 8, and this system is connected to two branch roads, an ECu control system that belongs to known technology; ECu is with footnote 9 indications; Another branch road is scheme of the present invention and designs, and can directly link last stage pressure reducers 4 from intercooler through branch road 10, and dotting out this is a connection that it is contemplated that; Concrete connection is to be connected to last stage pressure reducers 4 from mixer air inlet end through branch road 11, and this also is the concrete Placement of this programme.
In the erection drawing like Fig. 2, connect each parts with pipeline and constitute a complete engine air supply systems, block diagram is described visually.Air supply system comprises air and combustion gas, and air is through filter, the waste gas charging turbine; Get into mixer 5 through intercooler cooling back, gas supply system comprises that from the steel cylinder high-pressure natural gas to high pressure relief device 1, the second depressurized device of present embodiment and three grades of decompressors make up in the decompressor 12 at one; Decompressor more than three grades is not set, and the combustion gas of coming out from combination decompressor 12 is serially connected with a steam supply valve 13 by the control of Ecu system to the pipeline the mixer 5, and mixer 5 is linked in the outlet side of valve 13; Mixer 5 links to each other with the cylinder of motor; Supply with the mixed gas that mixes in proportion, this is the primary path of engine air supply systems, and a feedback branch by conceptual design is arranged; This feedback branch is so long as the air that comes out from intercooler can the branch sub-fraction directly be received on the last stage pressure reducers in theory;, but consider that the design of this programme is to manage 14 to the last stage pressure reducers of combination decompressor 12 from feedback of outlet side connection of mixer like the branch road in the block diagram 10 from structure.Described feedback is to also being balance tube.
The structure that has comprised combination decompressor 12 and mixer 5 in the system diagram of Fig. 3.Combination decompressor 12 is included in a flat box inner chamber and is divided into two chambers, and forming between secondary chamber 15 and 16, two chambers in three grades of chambeies has passage 17 intercommunications; Its passage has 18 its unlatchings of control of one or three grades of chamber valves, and secondary chamber has 19, three grades of chambeies of suction port that air outlet 20 is arranged; Suction port 19 has 21 controls of one secondary valve, and it is opened, and a compensated cavity 22 is arranged at the top in three grades of chambeies, and is porose between compensated cavity 22 and the three grades of chambeies 16; Be coated with three grades of diaphragms 23 of one deck on the hole; Be fixed with one or three grades of pressure springs 24 on the diaphragm 23, compensated cavity 22 has mouthful 25 external balance tubes 14, i.e. a feedback pipe in the flow chart.
The switching of the valve of secondary chamber import 19 is controlled by a leverage; Said leverage has a secondary diaphragm 26; Push down diaphragm with spring 27 above the diaphragm, the diaphragm the other end is provided with fulcrum 28, and the lever end 29 that diaphragm device forms is movably hinged a secondary valve 21.
Movable door structure between described secondary chamber 15 and the three grades of chambeies 16 also is that a lever 30 drives valves 18; Balance pivot 31 is arranged; Lever rear end links to each other with three grades of chamber diaphragms 23, on the dividing plate of secondary chamber, has hole 32, so that the pressed gas of secondary chamber can act on the diaphragm 26.
In the structural drawing of mixer, comprise mixed gas outlet 33, fuel gas inlet 34; The diaphragm 35 of one group of symmetry is arranged in the chamber, and the top middle part of diaphragm 35 and a pressure spring 36 join, and a cone 37 is fixed in the following intermediate portion of diaphragm; The conical section of cone 37 cooperates with a pipe mouth of pipe of 38, and pipe 38 communicates with fuel gas inlet 34, and this structure is symmetrical; The other end at mixer is a mixer suction port 39, on tube wall, is provided with an interface 40, connects balance tube 14.
For further specifying the working principle of this programme, decompressor among the above-mentioned figure and mixer are coupled together with balance tube 14, as shown in Figure 3; Combination decompressor in the diagram is that second depressurized device and three grades of decompressors are combined, and three grades of decompressors also are last stage pressure reducers, when the pressure rock gas that comes out from high pressure relief device 1 when second depressurized device inlet 19 gets into; Pressure has been reduced to about 1Mpa, and when the gas pressure in the secondary chamber 15 during less than 27Kpa, gas 32 is introduced and acted on the secondary diaphragm from the hole; Secondary diaphragm 26 below gas pressures can not overcome two-level spring 27 effects, secondary valve 21 can not be moved down seal gas access 19, so the pressure rock gas of 1Mpa gets in the secondary chamber 15; When the pressure in the secondary chamber 15 during greater than 27Kpa, secondary diaphragm 26 below gases can overcome two-level spring 27 effects greater than top pressure, secondary valve 21 is moved down seal inlet 19; Throttle down makes gas can not get into secondary chamber 15, and the pressure that has got into is that the combustion gas of 1Mpa is at the indoor dilution pressure of secondary chamber; Until about 27Kpa, so the gas pressure of secondary chamber 15 maintains about 27Kpa all the time, rock gas gets into three grades of chambeies 16 through secondary outlet 17 again; Three grades of diaphragm 23 tops receive the spring force effect and the action of air pressure that transports from import 25 through the balance tube 14 that is connected mixed gas inlet of three grades of pressure springs 24, when three grades of diaphragms of the natural pressure force rate in three grades of chambeies, 23 top pressure during greater than 4-5 foot water column, just can overcome the spring force of three grades of springs 24; Let three grades of diaphragms 23 upwards act on, under lever 30 effects, close three grades of air inlet passages 17; Thereby make the air pressure difference behind the charge inter cooling that rock gas gas pressure and mixer in three grades of chambeies 16 advance keep 4-5 foot water column, need to prove that three grades of chambeies 16 in fact also comprise one section cavity that one section steam supply valve 13 links to each other through pipeline and mixing decompressor 12; So the adjustment of the pressure in three grades of chambeies 16 and steam supply valve 13 also has relation, described steam supply valve 13 is by Ecu control, and the outlet side of steam supply valve 13 links to each other with the inlet end 34 of mixer 5; Air and combustion gas through mixer 5 mixes are in proportion sent into cylinder combustion through mixer air outlet 33, form negative pressure in the gaseous combustion rear cylinder, make diaphragm 35 tops receive downward active force; When the pressure difference of the mixer air-inlet cavity 34 of the pressure of diaphragm 35 tops and below can overcome 36 effects of mixer spring, upwards pressure spring upwards moves cone 37; Pipe 38 the mouth of pipe is opened, and combustion gas is flowed out from import 34 and is got in the mixer chamber and air mixing, because the air pressure difference that mixes behind three grades of chamber rock gas gas of decompressor and the charge inter cooling that mixer advances is constant; Present embodiment is through test, and best pressure reduction is 4-5 foot water column, and gaseous-pressure is higher than air pressure; So mixer hollow tolerance and amount of natural gas than with mixed process in the cross-section area equal proportion passed through; Thereby the air quantity of making and amount of natural gas are mixed into cylinder with desired proportions, lighting acting burning after, through outlet pipe; Get into pressurized machine and promote turbine, discharge from exhaust elbow.
The contribution of present technique scheme is having increased a feedback branch on the known air supply system, i.e. the branch road that forms of balance tube 14, and such purpose is to provide one to obtain best rock gas and air Mixture according to operating mode to motor; The power of engine producing is relevant with rock gas that is advanced and air mass flow, and pressure is for dependable flow, can know from the system diagram of Fig. 1; Have two feedback branches in fact, one is the Ecu system of known technology, and one is the set balance tube of present technique scheme 14 formed feedback branches; When Ecu system control rock gas control valve 13, each operating mode the optimum state of Ecu system acquisition motor, each parameter such as MAPS, intake air temperature sensor, engine water temperature sensor is set up database; During engine operation; According to the data of MAPS, intake air temperature sensor, engine water temperature sensor, search the only control valve parameter under this operating mode again, pass through lambda sensor again this rock gas control valve parameter correction; Last rock gas control valve changes the air feed cross-section area; Changing to the flow of combustion gas in the mixer, but lambda sensor is arranged on the engine exhaust pipe, and the content through detecting tail gas is as the parameter correction; This has been a kind of detection afterwards; A kind of hysteresis is arranged, and the fine adjustment of Ecu system as air supply system, the adjustment of the formed feedback branch of this programme is as initial adjustment usually; The function of Ecu system is done to replenish and improve, further improve the air supply system of gas as single fuel motor.
This programme balance tube 14 formed feedback branches are done to analyze as following; By knowing among Fig. 3, balance tube 14 inserts the effect that the top of making up 22, the three grades of diaphragms 23 of compensated cavity in the decompressor 12 receives two kinds of power altogether; The one, the air after the pressurization that gets into from balance tube 14, establishing its pressure is P
Air, the 2nd, pressure spring 24 gives the spring force of three grades of diaphragms 23, uses P
SpringExpression, P
Spring=λ S, wherein λ is an elasticity coefficient, and S is a stroke, and the below of three grades of diaphragms 23 receives the effect of gaseous-pressure, and establishing its power that acts on diaphragm is P
Combustion gas, have only the P of working as
Combustion gas＞P
Spring+ P
Air, three grades of valves 18 are promptly closed, i.e. P
Combustion gas-P
Air＞P
Spring, as long as promptly the pressure reduction between combustion gas and air during greater than acting force of the spring, three grades of valves 18 are promptly closed, and spring pressure P
SpringBe a pre-designed power; The spring force of this programme design is that pressure reduction that three grades of diaphragms 23 receive upper and lower surface just can pressure spring 24 when being 4-5 foot water column makes on it and moves, thereby closes three grades of valves 18, so can guarantee that according to the spring of above-mentioned parameter design the pressure reduction between rock gas and air is 4-5 foot water column; What this programme was stressed always is; Through overtesting, this pressure difference is the optimal proportion that forms mixed gas, meets the combustion condition of cylinder most.The air pressure that native system is sent here from balance tube 14 feedbacks is equivalent to set up one and rock gas comparative standard, and this technological scheme and Ecu relatively are not to adjust afterwards, but engine operating condition is adjusted immediately; And this hybrid mode improved reliability, mix more abundant, so its more remarkable effect; According to measuring and calculating, this device and similar type are as only using the device ratio of Ecu as system's adjustment; Power improves, and cost reduces, and is a kind of successful design scheme.
Claims (7)
1. the air supply system of a gas as single fuel motor, said air supply system supply engine air and combustion gas, air passes through air filter; Get into exhaust-gas turbocharger, get into intercooler after the supercharging from the air outlet, in air after cold get into mixer; Said combustion gas is a compressed natural gas, and the high-pressure natural gas that steel cylinder stores is connected to stop valve by the road through the decompression of one-level decompressor; To the second depressurized device, to three grades of decompressors; Afterbody forms last stage pressure reducers, and the gas of last stage pressure reducers goes out end and communicates with an inlet end of described gas mixer, and two kinds of gases fully mix the firing chamber of back supply engine cylinder in mixer; It is characterized in that: through turbosupercharging and in air after cold mainly get into mixer (5), also communicate with the last stage pressure reducers of combustion gas through a balance tube (14).
2. the air supply system of gas as single fuel motor according to claim 1 is characterized in that: the air inlet end of balance tube (14) with gas mixer (5) joined, and the other end of said pipe communicates with last stage pressure reducers.
3. the air supply system of gas as single fuel motor according to claim 2 is characterized in that: the other end of balance tube (14) links to each other with the compensated cavity of last stage pressure reducers.
4. the air supply system of gas as single fuel motor according to claim 1 is characterized in that: combination decompressor (12) is included in a flat box inner chamber and is divided into two chambers, forms secondary chamber (15) and three grades of chambeies (16); Passage (17) intercommunication is arranged between two chambers; Its passage has one or three grades of chamber valves (18) to control its unlatching, and secondary chamber has suction port (19), and there is air outlet (20) in three grades of chambeies; Suction port (19) has one secondary valve (21) to control its unlatching; One compensated cavity (22) is arranged at the top in three grades of chambeies, and is porose between compensated cavity and the three grades of chambeies (16), is coated with three grades of diaphragms of one deck (23) on the hole; Be fixed with one or three grades of pressure springs (24) on the diaphragm (23), compensated cavity (22) has mouthful (a 25) external balance tube (14).
5. the air supply system of gas as single fuel motor according to claim 4; It is characterized in that: the switching of the valve of secondary chamber import (19) is controlled by a leverage; Said leverage has a secondary diaphragm (26); Push down diaphragm with spring (27) above the diaphragm, the diaphragm the other end is provided with fulcrum (28), and the lever end (29) that diaphragm device forms is movably hinged a secondary valve (21).
6. according to the air supply system of claim 4 or 5 described gas as single fuel motors; It is characterized in that: the movable door structure between described secondary chamber (15) and the three grades of chambeies (16) also is that a lever (30) drives a valve (18); Balance pivot (31) is arranged; Lever rear end links to each other with three grades of chamber diaphragms (23), on the dividing plate of secondary chamber, has hole (32).
7. the air supply system of gas as single fuel motor according to claim 1 is characterized in that: described mixer comprises mixed gas outlet (33), fuel gas inlet (34); The diaphragm (35) of one group of symmetry is arranged in the chamber, and the top middle part of diaphragm and a pressure spring (36) join, and a cone (37) is fixed in the following intermediate portion of diaphragm; The conical section of cone cooperates with the mouth of pipe of a pipe (38); Pipe communicates with fuel gas inlet, and this structure is symmetrical, is mixer suction port (39) at the other end of mixer; On tube wall, be provided with an interface (40, connect balance tube (14).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100447109A CN101603476B (en) | 2008-06-12 | 2008-06-12 | Gas supply system of natural gas single-fuel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100447109A CN101603476B (en) | 2008-06-12 | 2008-06-12 | Gas supply system of natural gas single-fuel engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101603476A CN101603476A (en) | 2009-12-16 |
| CN101603476B true CN101603476B (en) | 2012-01-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008100447109A Expired - Fee Related CN101603476B (en) | 2008-06-12 | 2008-06-12 | Gas supply system of natural gas single-fuel engine |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102485515A (en) * | 2010-12-02 | 2012-06-06 | 中国国际海运集装箱(集团)股份有限公司 | Intelligent refrigerating transport vehicle |
| CN103343719A (en) * | 2013-04-08 | 2013-10-09 | 蒙国宁 | Novel air inlet mixing system for supercharged and inter-cooling gas engine |
| CN103696863A (en) * | 2013-11-25 | 2014-04-02 | 东风南充汽车有限公司 | Improvement on emission level of natural gas vehicle engine |
| CN104314710B (en) * | 2014-08-21 | 2016-08-10 | 杰瑞天然气工程有限公司 | The fuel gas defecator of natural gas engine |
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| CN101603476A (en) | 2009-12-16 |
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Address after: 637900 Sichuan, Jialing District, Nanchong Jia Nan Road, No. 1, No. 180 Patentee after: Geely Sichuan Commercial Vehicle Co., Ltd. Address before: 637000 Nanchong, Jialing District, Sichuan No. 1 South Road, Nanchong No. 1 internal combustion engine factory engine branch Patentee before: Dongfeng Nanchong Automobile Co., Ltd. |
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Granted publication date: 20120111 Termination date: 20210612 |
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