CN201425546Y - Rapid compression expander used in studying combustion process of engines - Google Patents
Rapid compression expander used in studying combustion process of engines Download PDFInfo
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- CN201425546Y CN201425546Y CN2009201071174U CN200920107117U CN201425546Y CN 201425546 Y CN201425546 Y CN 201425546Y CN 2009201071174 U CN2009201071174 U CN 2009201071174U CN 200920107117 U CN200920107117 U CN 200920107117U CN 201425546 Y CN201425546 Y CN 201425546Y
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Abstract
The utility model provides a rapid compression expander used in studying the combustion process of engines and designed to be used in studying the combustion characteristics of an internal combustionengine. The rapid compression expander comprises a combustion system, a drive mechanism, a feed system, a braking mechanism and a testing system, wherein, a drive cylinder (9), a drive piston (25), adrive connecting rod (24), a drive crank shaft (23), a rollback cylinder (14), a rollback cylinder piston (28), and a rollback cylinder connecting rod (27) are installed on a drive cylinder-use cylinder body (8) positioned at in the bottom layer; a combustion cylinder (2), a lengthened piston (20), a connecting rod (21), and a crank shaft (22) are installed on a combustion cylinder-use cylinder body (4) in the upper layer; a drive gear (7) is mounted on the drive crank shaft (23); the drive connecting rod (24) installed on the drive crank shaft (23) is connected with the drive piston (25); a driven gear (6) is mounted on the crank shaft (22); and the connecting rod (21) connected to the crank shaft (22) is connected with the lengthened piston (20). Through the power transmission of the gears, the compression speed of the piston can be adjusted by altering the gear ratio.
Description
Technical field
The utility model relates to and is used for test unit that engine combustion process is studied, but the compression of this test unit simulated engine, burning and expansion process, be mainly used in catching fire and combustion characteristics research of pluralities of fuel, belong to field of internal combustion engine, be specially the combustion in IC engine research field.
Background technology
Processes such as the Actual combustion of internal combustion engine, heat transfer, fuel and air mixed are very complicated, often be attended by cyclical variations in addition, obtaining process of the test parameter really and accurately or controlling burning condition between every circulation constant is unusual difficulty, and the comparability of test findings is not strong.Therefore, utilizing fast compressing expansion machine to simulate the combustion process of pluralities of fuel, different combustion systems, in conjunction with relevant test and analytical technology, is the effective means of delegation that the combustion process and the combustion characteristics of engine are carried out fundamental research.
In order to study the combustion process of engine better, the researchist proposes and has developed various simulated test facilitys.Jilin University has researched and developed a kind of multi-functional combustion bullet that is used for the simulated engine combustion process, its structure diagram is seen accompanying drawing 5, this firebomb mainly contains actuating cylinder 30, power piston group 31, firing chamber 32, supply pressure-air in the actuating cylinder 30, compression power piston set 31 is to firing chamber 32 1 end motions, and the fuel-air mixture in the compression and combustion chamber 32 is until the combination gas compression ignite or by spark ignitor.This multi-functional combustion resilience energy is realized the simulation to the combustion process of different fuel, different combustion systems in the engine cylinder, but there is the problem that power piston group travelling speed is slow, gas leaks in this device, and the speed of this and real engine piston motion differs bigger.
Can be accurate in order to develop, simulate the test unit of the course of work of real engine truly, separate the fast compressing expansion machine that has proposed a kind of process of studying combustion process of engine, in order to solve the problem that improves piston movement speed, this test unit has proposed to use existing two gasoline engine engine cylinder-bodies, utilize two in-engine bent axles, connecting rod, piston mechanism carries out transmission, carry out power transmission by gear drive between two bent axles, change gear than the speed that can suitably adjust the Piston Compression combination gas, realize the piston rapid movement, can be near the movement velocity of real engine piston.Simultaneously, the twice piston ring has been installed on the driven plunger, can have been solved the problem that driving gas leaks effectively.On the other hand, this device utilizes existing engine component, is easy to transform.In addition, traditional rcm adopts usually when testing and transparent quartz glass is housed so that video camera is taken burning image on cylinder head.Owing to want fuel arranged and air supply pipe road, sensor installation and portfire on the cylinder head, like this structural strength of cylinder head had relatively high expectations; And in order to realize alterable compression ratio, the different cylinder head of supporting sometimes use also changes the ratio of compression of firing chamber.The utility model adopts at top land and arranges quartz glass, utilizes optical principle that the combustion chambers burn situation is taken from piston base, changes ratio of compression by the thickness of adjusting quartz glass, can reduce requirement and manufacturing cost to cylinder head like this.
The utility model content
The purpose of the utility model device is for the indoor combustion process of engine combustion is carried out the deep research of system, a kind of compression, burning, the test unit of expansion process that can simulated engine be proposed, mainly utilize the pressure of gases at high pressure to promote piston motion, only make the indoor gas of pressure stroke compression and combustion and make it burning, for compression and the ignition process of simulating internal combustion engine provides a desirable research technique.
To achieve these goals, this fast compressing expansion machine is made up of the following train of mechanism, and system's basic composition is seen accompanying drawing 1.This device mainly is made up of combustion system, driving mechanism, arrestment mechanism, feed system, test macro.This test unit has proposed to use two engine cylinder-bodies and inner bent axle, connecting rod, piston mechanism thereof to carry out transmission, carry out the testing program of power transmission between two bent axles by gear drive, drive cylinder and all adopt horizontal layout with 4 two cylinder bodies of cylinder body with cylinder body 8, combustion cylinders, wherein, drive cylinder and be positioned at bottom with cylinder body 8, combustion cylinders is positioned at the upper strata with cylinder body 4.
The utility model provides a kind of fast compressing expansion machine of process of studying combustion process of engine, comprise combustion system, driving mechanism, feed system, arrestment mechanism, test macro, it is characterized in that, described driving mechanism structure is as follows: drive cylinder and all adopt horizontal layout with cylinder body 8, combustion cylinders with 4 two cylinder bodies of cylinder body, wherein, drive cylinder and be positioned at lower floor with cylinder body 8, combustion cylinders is positioned at the upper strata with cylinder body 4; Follower gear 6 is located at combustion cylinders with in the cylinder body 4, and driving gear 7 is located at and drives cylinder cylinder body 8, and follower gear 6 and driving gear 7 are meshing with each other;
Drive cylinder and be separately installed with driving cylinder 9 and rollback cylinder 14, drive and be provided with driven plunger 25, drive link 24 in the cylinder 9, drive bent axle 23, drive the drive link 24 of installing on the bent axle 23 and be connected with driven plunger 25 with cylinder body 8 sides; Be provided with rollback cylinder piston 28, rollback air cylinder connecting rod 27 in the rollback cylinder 14, combustion cylinders is equipped with cylinder body 4 sides and is provided with lengthened piston 20, connecting rod 21, bent axle 22 in combustion cylinders 2, the combustion cylinders 2, and lengthened piston 20 is installed on the bent axle 22 by connecting rod 21.The transparent quartz glass 19 that be equipped with at lengthened piston 20 tops.
The advantage of this fast compressing expansion machine is:
Utilize cylinder body, bent axle, connecting rod, the piston mechanism of two engines,, realize the piston rapid movement by gear drive;
Gear ratio is adjustable;
The ratio of compression of firing chamber is adjustable;
Can carry out the combustion characteristic research of variety classes fuel;
Can carry out the combustion characteristic research of different fuel and Air mixing ratio.
Description of drawings
Fig. 1 fast compressing expansion machine is formed sketch
Fig. 2 combustion system mechanism map
Fig. 3 drives cylinder mechanism figure
Fig. 4 rollback cylinder mechanism figure
The multi-functional combustion bullet sketch of Fig. 5 Jilin University research and development
Among the figure:
1-burning gas cylinder cap, 2-combustion cylinders, 3-level crossing, 4-combustion cylinders cylinder body, the 5-video camera, the 6-follower gear, the 7-driving gear, 8-drives the cylinder cylinder body, 9-drives cylinder, 10-pressure-air, 11-spark plug, the 12-pressure transducer, 13-fuel, 14-rollback cylinder, the 15-charge amplifier, 16-data collecting card, 17-computing machine, the 18-air intake duct, 19-quartz glass, 20-lengthened piston, the 21-connecting rod, the 22-bent axle, 23-drives bent axle, the 24-drive link, the 25-driven plunger, 26-drives the cylinder bleeder port, 27-rollback air cylinder connecting rod, 28-rollback cylinder piston, 29-rollback cylinder bleeder port, the 30-actuating cylinder, 31-power piston group, 32-firing chamber
Embodiment
Describe the utility model in detail below in conjunction with Fig. 1～4.
Combustion system is the place of realizing fuel and Air mixing, igniting, burning, mainly is made up of combustion cylinders 2 and burning gas cylinder cap 1, spark plug 11, lengthened piston 20.The firing chamber of combustion system is surrounded by its inner lengthened piston 20, combustion cylinders 2 and burning gas cylinder cap 1.Spark plug 11, pressure transducer 12 are installed on the burning gas cylinder cap 1, air intake duct 18 is arranged in the burning gas cylinder cap, fuel and air enter the firing chamber through air intake duct 18, by spark plug 11 ignition.In order to observe the combustion position in the firing chamber, the transparent quartz glass 19 of high temperature high voltage resistant is equipped with at lengthened piston 20 tops, can regulate the different ratio of compression of firing chamber by the quartz glass of changing different-thickness.Level crossing 3 is installed in combustion cylinders with on the cylinder body, and near combustion cylinders 2 bottoms the level crossing installation site have individual opening to be convenient to level crossing emission light.During burning, the light that sends when fuel and air burning arrives through quartz glass 19 and adds level crossing 3, and light is seen through the combustion cylinders bottom opening by level crossing 3 emission backs and arrives video camera 5, and video camera 5 just can in time write down the combustion process that takes place in the firing chamber like this.
Driving mechanism is the motion that realizes motion, simulates the compression of actual Otto cycle engine, the process of expansion.Driving mechanism is by two gasoline engine cylinder bodies: combustion cylinders with cylinder body 4, drive cylinder with cylinder body 8 formation base frameworks.Be equipped with on cylinder body 8 and drive cylinder 9, driven plunger 25, drive link 24, driving bent axle 23, driving gear 7 and rollback cylinder 14, rollback cylinder piston 28, rollback air cylinder connecting rod 27 driving cylinder; Follower gear 6, bent axle 22, connecting rod 21 are installed in combustion cylinders on cylinder body 8.Drive in the cylinder 9 and be filled with pressure-air, pressure-air promotes driven plunger 25 motion in driving cylinder 9, and driven plunger 25 drive drive link 24 make and drive bent axle 23 rotations.In order to prevent that driving cylinder air generation leakage causes the decline of driving gas pressure to be difficult to drive the lengthened piston rapid movement, the twice piston ring is housed on driven plunger 25, the otch of bipassage ring staggers to guarantee sealing.Driving bent axle 23 by 6 rotations of driving gear mounted thereto 7 driving follower gears.Follower gear 6 is installed in combustion cylinders with on the bent axle 22 in the cylinder body 4, driving gear 7 is 2: 1 with the gear ratio of follower gear 6, therefore bent axle 22 is to drive the twice rotating speed rotation of bent axle 23 rotating speeds, thereby drivening rod 21, lengthened piston 20 motions, so just can realize lengthened piston 20 rapid movements, the fuel-air mixture that compression and combustion is indoor is simulated the pressure stroke of actual Otto cycle engine.After combustion process is finished, the lengthened piston of driven plunger, combustion cylinders need be got back to original position, at this moment, by 28 counter motions of high pressure air drives rollback cylinder piston, drive rollback air cylinder connecting rod 27, the masterpiece of generation is used to drive on the bent axle 23 and is made its reverse rotation, thereby, promote drive link, driven plunger counter motion, return to initial position at last, for test is next time got ready.
Brake system is used for making before compressed mixed gas these moving parts of piston, bent axle to keep stationary states, and when the burning indoor temperature, when pressure reaches required value, brake system is brake off rapidly, and assurance bent axle, connecting rod, piston can free movement.Brake system mainly is made up of brake disc, braking air valve and relevant high pressure airline.Pressure-air applies enough big acting force to brake disc and causes brake disc tightly to be fitted being installed in flywheel on the bent axle, and it is static to make that flywheel, bent axle are in.The supply to the pressure-air of brake disc can be opened or interrupt to the braking air valve, realizes the braking of brake disc or the function of brake off.
Test macro is used for measuring and write down the combustion process in the firing chamber, mainly is made up of pressure transducer 12, charge amplifier 15, data collecting card 16, computing machine 17 and interlock circuit, video camera 5.Pressure transducer 12 induction inner pressure of air cylinder also are converted to voltage signal, amplify the back by data collecting card 16 image data via letter charge amplifier 15, import computing machine 17 records at last so that further analyze.Through computer programming, test macro can realize gathering in real time the in-cylinder pressure of firing chamber.Simultaneously, video camera 5 can be taken ground burning image, analytic combustion characteristic in view of the above and correlated performance in the firing chamber in real time.
Feed system is that firing chamber fuel supplying and air form combustion mixture, provides pressure-air for driving mechanism and arrestment mechanism simultaneously.Feed system mainly is made up of fuel under high pressure gas cylinder, pressure-air gas cylinder and corresponding fuel feed pipe, high-pressure air tube, reduction valve, air valve.Fuel gas cylinder and fuel conduit provide combustion gas for the firing chamber, and pressure-air gas cylinder and air pipe line are mainly and drive cylinder, rollback cylinder, brake disc pressure-air is provided.
The course of work of this fast compressing expansion machine mainly is: at first give in the firing chamber to charge into fuel and air, charge into pressure-air for simultaneously the driving cylinder; At this moment, brake disc keeps each moving component of driving mechanism static.Treat that fuel and air mixed are even in the firing chamber, the take-off the brake dish, under the pressure effect of the pressure-air in driving cylinder, the driven plunger motion, by the lengthened piston rapid movement in the gear drive drive combustion cylinders, compressing inflammable mixture gas is near lengthened piston arrives top dead centre, plug ignition, mixture combustion.Burning gases expand, and promote lengthened piston and move to lower dead center, have so just simulated compression, burning, the expansion process of Otto cycle engine.By video camera, pressure transducer the firing chamber combustion process is noted so that the analytic combustion performance.At last, charge into pressure-air for the rollback cylinder, drive the rollback piston motion, drive driven plunger, lengthened piston are got back to original position, prepare the course of work next time.
The course of work of present embodiment: the initial position of each moving component is before this device busy: the lengthened piston 20 in the combustion cylinders is positioned at the bottom dead center position of firing chamber, drive the side that cylinder 9 interior driven plunger 25 are positioned at the close air-filled pore that drives cylinder, the rollback piston 28 in the rollback cylinder 14 is positioned at rollback cylinder bleeder port 29 1 sides.
When rcm is started working, at first give in the firing chamber of combustion cylinders 2 to be full of fuel-air mixture by feed system; Simultaneously, open the charging valve that drives cylinder 9, charge into pressure-air for driving cylinder 9.At this moment, brake disc tightly touch and drives bent axle 25, and each moving component of driving mechanism keeps static.
When fuel in the firing chamber and air mixed are even, when pressure transducer 12 detects firing chamber, road in-cylinder pressures and arrives required values, close the fuel charge valve, stop in the firing chamber, to charge into fuel; Close the inflation air valve that drives cylinder 9, stop to charge into pressure-air to driving cylinder 9; Keep the air valve of rollback cylinder 14 to be communicated with atmosphere, gaseous tension is an atmospheric pressure in the rollback cylinder 14, can not bring obstruction to the motion that drives bent axle 25 like this; And open the brake disc air valve, brake disc unclamps under the pressure effect of pressure-air.At this moment, owing to drive in the cylinder 9 and be full of pressure-air, under the effect of high-pressure gas pressure, driven plunger 25 motions, drive drive link 24 swings, drive bent axle 23 rotations, be installed in the driving gear 7 that drives bent axle 23 ports and rotate jointly, rotate thereby drive follower gear 6 with driving bent axle 23.Because follower gear and bent axle 22 and commentaries on classics together, bent axle 22 is just with the rotating speed rotation of the twice that drives bent axle 23, and the connecting rod 21 that promotes to be attached thereto moves, the final lengthened piston 20 of realizing is fast to the motion of firing chamber top dead centre direction, and the indoor combustion mixture that mixes of compression and combustion is near top dead centre, spark plug 11 igniting, light combination gas, mixture combustion, pressure transducer are gathered internal pressure of combustion chamber, video camera 5 record combustion processes and are preserved data.
In the time of near lengthened piston 20 moves to top dead centre, driven plunger 25 moves to and drives cylinder bleeder port 26 places.Combination gas mixture combustion after expansion, the swelling pressure that produce promote lengthened piston 20 and oppositely move to the firing chamber bottom dead center position, lengthened piston 20 is when the motion process of expansion stroke, bent axle 22 continues to rotate forward, the driving bent axle 23 that drives in the cylinder 9 also moves forward, and driven plunger 25 moves on, and exposes to drive cylinder bleeder port 26, the pressure-air that drives in the cylinder 9 is discharged from driving cylinder bleeder port 26, drives cylinder 9 internal gas pressures and drops to atmospheric pressure gradually.The burning indoor gas constantly expands, and pressure constantly descends, at last under the friction force effect, and lengthened piston 20 stop motions, other motions are all stop motions also.So far, a course of work of fast compressing expansion machine finishes, and video camera 5 stops record.
In order to carry out next one work and test smoothly, guarantee to drive the initial position that the lengthened piston 26 in driven plunger 25, the combustion cylinders 2 in the cylinder 9 is got back to work, be provided with rollback cylinder 14 in this device.After the compression-expansion process finishes, the air valve of regulating rollback cylinder 14 makes pressure-air charge into rollback cylinder 14, because this moment, the last course of work finished, drive cylinder 9 interior gases and discharge the driving cylinders, so just can not influence driven plunger 25 counter motions from driving cylinder bleeder port 26; Like this, under the pressure effect of rollback cylinder 14 mesohigh air, rollback piston 28 promotes to drive bent axle 23 and continues rotation, makes driven plunger to the position motion that drives the cylinder charge valve, finally gets back to initial position.Under the effect that drives the rotation of bent axle driven gear, lengthened piston 20, rollback piston 28 in the combustion cylinders 2 are also got back to initial position.Close the air valve of rollback cylinder 14 at last, simultaneously, brake disc is held tightly once more and is driven bent axle 23, and whole device returns to the original state of work once more, can carry out the course of work next time.
This device can carry out the combustion characteristic research of variety classes fuel, different combustion system (light, compression ignite).When using plug ignition, fuel-air mixture is the spark ignition type burning; When not using plug ignition but the only pressured fuel gas mixture spontaneous combustion of contracting is compression-ignited burning.Simultaneously, can realize the combustion characteristic research of different ratio of compression by the quartz glass 19 of changing different-thickness.
Claims (2)
1, a kind of fast compressing expansion machine of process of studying combustion process of engine, comprise combustion system, driving mechanism, feed system, arrestment mechanism, test macro, it is characterized in that, described driving mechanism structure is as follows: drive cylinder and all adopt horizontal layout with cylinder body (8), combustion cylinders with (4) two cylinder bodies of cylinder body, wherein, drive cylinder and be positioned at lower floor with cylinder body (8), combustion cylinders is positioned at the upper strata with cylinder body (4); Follower gear (6) is located at combustion cylinders with in the cylinder body (4), and driving gear (7) is located at and drives cylinder cylinder body (8), and follower gear (6) and driving gear (7) are meshing with each other;
Driving gear (7) is installed in and drives on the bent axle (23), and the follower gear (6) that meshes with driving gear (7) is installed on the bent axle (22);
Drive cylinder and be separately installed with driving cylinder (9) and rollback cylinder (14) with cylinder body (8) side, drive and be provided with driven plunger (25), drive link (24) in the cylinder (9), drive bent axle (23), driving bent axle (23) is gone up the drive link (24) of installing and is connected with driven plunger (25); Be provided with rollback cylinder piston (28), rollback air cylinder connecting rod (27) in the rollback cylinder (14), combustion cylinders is equipped with cylinder body (4) side and is provided with lengthened piston (20), connecting rod (21), bent axle (22) in combustion cylinders (2), the combustion cylinders (2), and lengthened piston (20) is installed on the bent axle (22) by connecting rod (21).
2, the fast compressing expansion machine of process of studying combustion process of engine according to claim 1 is characterized in that: the transparent quartz glass (19) that be equipped with at lengthened piston (20) top.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201071174U CN201425546Y (en) | 2009-04-03 | 2009-04-03 | Rapid compression expander used in studying combustion process of engines |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201071174U CN201425546Y (en) | 2009-04-03 | 2009-04-03 | Rapid compression expander used in studying combustion process of engines |
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| CN201425546Y true CN201425546Y (en) | 2010-03-17 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103116010A (en) * | 2013-01-27 | 2013-05-22 | 浙江大学 | Compression and combustion testing device of mixed gas |
| CN113465929A (en) * | 2021-07-15 | 2021-10-01 | 哈尔滨工程大学 | Internal combustion engine spray combustion performance testing device based on rapid compression expander |
-
2009
- 2009-04-03 CN CN2009201071174U patent/CN201425546Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103116010A (en) * | 2013-01-27 | 2013-05-22 | 浙江大学 | Compression and combustion testing device of mixed gas |
| CN103116010B (en) * | 2013-01-27 | 2014-11-12 | 浙江大学 | Compression and combustion testing device of mixed gas |
| CN113465929A (en) * | 2021-07-15 | 2021-10-01 | 哈尔滨工程大学 | Internal combustion engine spray combustion performance testing device based on rapid compression expander |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100317 Termination date: 20110403 |