CN101520000A - Single-piston hydraulic free-piston engine with vibration damping scavenging pumps - Google Patents
Single-piston hydraulic free-piston engine with vibration damping scavenging pumps Download PDFInfo
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- CN101520000A CN101520000A CN200910097059A CN200910097059A CN101520000A CN 101520000 A CN101520000 A CN 101520000A CN 200910097059 A CN200910097059 A CN 200910097059A CN 200910097059 A CN200910097059 A CN 200910097059A CN 101520000 A CN101520000 A CN 101520000A
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Abstract
The invention discloses a single-piston hydraulic free-piston engine with vibration damping scavenging pumps. An engine main body is a single-piston hydraulic free-piston engine, two sides of which are symmetrically provided with two scavenging pumps moving linearly, the center lines of the two scavenging pumps and the center line of the hydraulic free-piston engine are all positioned in a plane and are parallel to a mounting base, and the scavenging pumps utilize one small part of hydraulic output by the free-piston engine as the driving force to lead the movement of the two scavenging pumps to be opposite to the movement of a free piston of the engine, therefore, the action force of the scavenging pumps, applied on the engine body, can be balanced out one part so as to achieve the purpose for reducing the engine body vibration. The scavenging pumps output fresh air with higher pressure to a combustion cavity of a two-stroke oil engine for scavenging and charging, which improves the combustion efficiency of the engine, lowers the pollutant emission and increases the output power. The invention can be applied to engineering plants and vehicles in a city to be used as a drive device.
Description
Technical field
The present invention relates to reciprocating engine, especially relate to a kind of single-piston hydraulic free-piston engine with vibration damping scavenging pumps.
Background technique
Because global energy crisis and to raising day by day, environmental protection and the energy-conservation two big main flow requirements that become motor of environmental requirement.Hydraulic free-piston engine can not only provide enough power for engineering machinery, and is the strong impetus that promotes the modern hydraulic technology development.
Number and compression stroke implementation branch from piston assembly and power cavity: hydraulic free-piston engine can be divided into single piston type, opposed piston and double piston type.Single-piston hydraulic free-piston engine is simple in structure, and needed component are few, and control is relatively easy, and on the hydraulic pressure fork truck, carried out example use, but because it is a single cylinder engine, do not have other moving element to come its motion of balance, therefore have vibration; The opposed piston hydraulic free-piston can effectively be eliminated vibration under the prerequisite of two opposed pistons precise synchronization control, but has increased the difficulty and the complexity of control system; Problems such as the double piston type hydraulic free-piston engine has than other two kinds of specific poweies that structure is high, but has compression ratio precision control difficulty, and the scavenging time is short, same vibration also is its problem that can't avoid.Opposed piston and double piston type hydraulic free-piston engine all are in laboratory research and advanced development stage at present, do not enter application of practical project.
For the vibration problem of hydraulic free-piston engine, a kind of method commonly used is exactly that mounting base is fixed on the ground by foot screw by suitable damping device, perhaps vibration is offset in the opposed placement of several cylinders at present.But the effect of damping device is unsatisfactory.The opposed complexity that also increases structure of multi-cylinder, and require the control of several cylinders is required accurately, otherwise might play opposite effect, the aggravation vibration.
Summary of the invention
The object of the present invention is to provide a kind of single-piston hydraulic free-piston engine with vibration damping scavenging pumps, this motor adopts two vibrations that reduce the hydraulic free-piston engine body about the straight-line scavenging pump of doing of hydraulic free-piston engine symmetry, and the air inlet rate in raising combustion in IC engine chamber, promote the burning of fuel, improve the output power of motor.
The technological scheme that the present invention solves its technical problem employing is:
Burning piston left side in the cylinder block is the burning cavity of two stroke diesel engine, the burning piston the right side by piston rod successively be contained in hydraulic cylinder in oil hydraulic pump piston and compression piston link to each other, scavenging port on the cylinder block links to each other with the second scavenging pump air supply opening with first scavenging pump of piston moving linearly by pipeline PA, the oil hydraulic pump piston is divided into left and right sides two-part with the hydraulic pressure pump chamber in the hydraulic cylinder, right side hydraulic pressure pump chamber links to each other with an end of high pressure accumulator by first one-way valve, the other end of high pressure accumulator links to each other with left side hydraulic pressure pump chamber and load simultaneously, right side hydraulic pressure pump chamber is by the oil feed non-return valve group, second one-way valve links to each other with low pressure accumulator through the one 2/2 selector valve, the right side of compression piston is a compression chamber, it links to each other with low pressure accumulator through the one 2/2 selector valve by the 3rd one-way valve, compression chamber also is connected with the compress energy storage device through the FREQUENCY CONTROL valve by the 4th one-way valve, be connected by the 2 2/2 selector valve between low pressure accumulator and the compress energy storage device, the scavenging piston of first scavenging pump and second scavenging pump is respectively by first, the second scavenging pump hydraulic piston and first, second displacer is formed, first, the second scavenging pump hydraulic piston and first, second displacer is contained in respectively in separately the scavenging pump cylinder body, scavenging pump first, the second scavenging pump hydraulic piston is divided into two-part with the hydraulic pressure cavity of scavenging pump, wherein first, the second scavenging pump hydraulic pressure cavity is through first, the second stroke input end of calming the anger links to each other with low pressure accumulator by pipeline LP, first, the second suction stroke input end links to each other with right side hydraulic pressure pump chamber by pipeline PP, first of scavenging pump, the second displacer right side is first, second scavenging pump chamber of calming the anger communicates with atmosphere A by the scavenging pump intakeport.
The present invention compares with background technique, and the useful effect that has is:
Because the moving direction of two scavenging pump pistons is opposite with the moving direction of hydraulic free-piston engine piston, make the active force partial offset that they produce on body, thereby reach the purpose that reduces body vibration, avoid damaging motor and guarantee the motor stable operation.And scavenging pump is exported the burning cavity that the fresh air with certain pressure enters two stroke diesel engine, and waste gas is cleaned and diesel engine is inflated, and has improved compressed-air actuated pressure, promotes the burning of fuel, and then improves the output power of motor.
This invention can be used for engineering machinery, urban transportation vehicle as drive unit.
Description of drawings
Fig. 1 is the compression stroke of hydraulic free-piston engine, i.e. the schematic representation of piston assembly when left movement.
Fig. 2 is the stressed schematic representation of engine body when compression stroke.
Fig. 3 is the expansion expansion stroke of hydraulic free-piston engine, the schematic representation when promptly piston assembly moves right.
Fig. 4 is the stressed schematic representation of engine body when the expansion expansion stroke.
Fig. 5 is that the lateral location of hydraulic free-piston engine and two scavenging pumps concerns schematic representation.
Among the figure: 1. burning cavity, 2. burning piston, 3. piston rod, 4. high pressure accumulator, 5. left side hydraulic pressure pump chamber, 6. one-way valve, 7. oil hydraulic pump piston, 8. right side hydraulic pressure pump chamber, 9. compression piston, 10. compress energy storage device, 11, one-way valve, 12. the FREQUENCY CONTROL valve, 13. compression chambers, 14.2/2 selector valve, 15. one-way valve, 16. one-way valves, 17.2/2 selector valve, 18. low pressure accumulator, 19. one-way valve, 20. oil feed non-return valve groups, 21. scavenging ports, 22,22 '. the scavenging pump chamber of calming the anger, 23,23 '. scavenging pump air supply opening, 24,24 '. scavenging pump intakeport, 25,25 '. displacer, 26,26 '. the suction stroke input end, 27,27 '. the stroke input end of calming the anger, 28,28 '. scavenging pump hydraulic pressure cavity, 29,29 '. the scavenging pump hydraulic piston.
Embodiment
The present invention is further illustrated below in conjunction with drawings and embodiments.
As Fig. 1, shown in Figure 3, burning piston 2 left sides in the cylinder block of the present invention are the burning cavity 1 of two stroke diesel engine, the burning piston 2 the right side by piston rod 3 successively be contained in hydraulic cylinder in oil hydraulic pump piston 7 and compression piston 9 link to each other, scavenging port 21 on the cylinder block is by first scavenging pump and the second scavenging pump air supply opening 23 of pipeline PA and piston moving linearly, 23 ' link to each other, wherein the air supply opening of two scavenging pumps all is equipped with one-way valve, to guarantee the one-way flow of internal gas, oil hydraulic pump piston 7 is divided into left and right sides two-part with the hydraulic pressure pump chamber in the hydraulic cylinder, right side hydraulic pressure pump chamber 8 links to each other with an end of high pressure accumulator 4 by first one-way valve 6, the other end of high pressure accumulator 4 links to each other with left side hydraulic pressure pump chamber 5 and load simultaneously, right side hydraulic pressure pump chamber 8 is by oil feed non-return valve group 20, second one-way valve 19 links to each other with low pressure accumulator 18 through the one 2/2 selector valve 17, the right side of compression piston 9 is compression chambers 13, it links to each other with low pressure accumulator 18 through the one 2/2 selector valve 17 by the 3rd one-way valve 16, compression chamber 13 also is connected with compress energy storage device 10 through FREQUENCY CONTROL valve 12 by the 4th one-way valve 11, be connected by the 2 2/2 selector valve 14 between low pressure accumulator 18 and the compress energy storage device 10, the scavenging piston of first scavenging pump and second scavenging pump is respectively by first, the second scavenging pump hydraulic piston 29,29 ' and first, second displacer 25,25 ' form, first, the second scavenging pump hydraulic piston 29,29 ' and first, second displacer 25, in 25 ' respectively scavenging pump cylinder bodies that are contained in separately, scavenging pump first, the second scavenging pump hydraulic piston 29,29 ' hydraulic pressure cavity of scavenging pump is divided into two-part, wherein first, the second scavenging pump hydraulic pressure cavity 28,28 ' through first, the second stroke input end 27 of calming the anger, 27 ' link to each other with low pressure accumulator 18 by pipeline LP, first, the second suction stroke input end 26,26 ' link to each other with right side hydraulic pressure pump chamber 8 by pipeline PP, first of scavenging pump, second displacer 25,25 ' right side is first, second scavenging pump chamber 22 of calming the anger, 22 ', by scavenging pump intakeport 24,24 ' communicate with atmosphere A, wherein the intakeport of two scavenging pumps also is equipped with one-way valve, air-breathing from atmosphere to guarantee in suction stroke, and in the stroke of calming the anger, avoid gas to flow out.Be connected to the 5th one-way valve 15 between the compression chamber 13 of hydraulic free-piston engine and low pressure accumulator 18, it mainly acts on is to prevent in course of normal operation, compression chamber through the 3rd one-way valve and the one 2/2 selector valve to low pressure accumulator 18 leakage of oils.
The stroke input end of calming the anger of described straight-line two scavenging pumps links to each other with right side hydraulic pressure pump chamber with the low pressure accumulator of hydraulic free-piston engine respectively with the suction stroke input end, the driving force that is straight-line two scavenging pumps is directly taken from the hydraulic system of hydraulic free-piston engine, and does not need independent drive system.
As Fig. 2, shown in Figure 4, F
EngBe that engine piston motion acts on the power on the engine body, F
Scav, F '
ScavBe respectively that two scavenging pump piston motions act on the power on the body, N
1, N
2Be respectively that two scavenging pump piston motions act on the moment of torsion on the body.As seen from the figure, the linear movement direction of described scavenging pump piston is opposite with the moving direction of hydraulic free-piston engine piston, and two scavenging pump piston motions act on the moment of torsion N that the power on the body produces with respect to the axis of hydraulic free-piston engine
1And N
2Equal and opposite in direction, direction is opposite.
As shown in Figure 5, the centre is a hydraulic free-piston engine, both sides are scavenging pumps, their centre distance is L, promptly two straight-line scavenging pump symmetries are installed in the both sides of hydraulic free-piston engine, and the center line three of its center line and hydraulic free-piston engine is in same plane and parallel with mounting base.When the scavenging pump piston motion, act on the power on the body like this, the moment of torsion N that produces with respect to the central axis of motor
1, N
2Can cancel out each other, and can in the active force of offsetting the engine piston motion generation, not increase other active force, guarantee the normal operation of motor, play damping effect.
According to the working condition of motor, be divided into compression stroke and expansion expansion stroke.
A) compression stroke:
As shown in Figure 1, send work order when control system, impel FREQUENCY CONTROL valve 12 to open, the high pressure oil in the compress energy storage device 10 enters compression chamber 13 by FREQUENCY CONTROL valve 12 at this moment, promotes piston assembly to left movement; Right side hydraulic pressure pump chamber 8 is by oil feed non-return valve group 20 oil suction from low pressure accumulator 18, simultaneously, because the high pressure oil that oil hydraulic pump piston 7 to left movement, promotes in the left side hydraulic pressure pump chamber 5 enters in the high pressure accumulator 4; At this moment, the pressure of pipeline PP and pipeline LP is basic identical, scavenging pump hydraulic piston 29,29 ' under the effect of left and right sides pressure reduction, move right, compression scavenging pump chamber 22, the 22 ' interior air of calming the anger, make it from scavenging pump air supply opening 23,23 ' output to the scavenging port 21 of two stroke diesel engine, begin to clean and provide fresh air the waste gas in the burning cavity 1; Free piston assembly proceeds to predetermined compression ratio, and fuel injection is in burning cavity 1; Piston assembly moves to left stop.Motor is finished compression stroke, and two scavenging pumps are also finished their air feed process.
As shown in Figure 2, in compression stroke, free piston assembly acts on the power F on the body
EngTo the right, and the scavenging pump piston motion acts on the power F on the body
ScavAnd F '
ScavLeft; Because F
EngBigger than other two power, so resultant direction is to the right, but the amplitude of making a concerted effort greatly reduces; The moment of torsion N that the active force of two scavenging pumps produces
1And N
2Therefore opposite sign but equal magnitude cancels out each other.Therefore in compression stroke, can reduce the vibration of body.
B) expansion expansion stroke:
As shown in Figure 3, piston assembly begins to move right under the effect of the energy that fuel combustion discharged.Hydraulic oil in the right side hydraulic pressure pump chamber 8 enters high pressure accumulator 4 through one-way valve 6 parts under the effect of oil hydraulic pump piston 7 at this moment, another part enters in the left side hydraulic pressure pump chamber 5, hydraulic oil in the compression chamber 13 is under the effect of compression piston 9, flow back in the compress energy storage device 10 through one-way valve 11, for compression stroke is next time prepared; This moment because scavenging pump suction stroke input end 26,26 ' link to each other with right side hydraulic pressure pump chamber 8 by pipeline PP, be in high pressure conditions, and the stroke input end 27,27 of calming the anger ' still link to each other by pipeline LP with low pressure accumulator 18, therefore scavenging pump hydraulic piston 29,29 ' under the effect of pipeline PP pressure is to left movement, this moment calm the anger chamber 22,22 ' of scavenging pump by scavenging pump intakeport 24,24 ' from atmosphere A, suck fresh air.When burning piston 2 moved to Exhaust Open, the waste gas in the burning cavity 1 was discharged.When piston assembly moved to right stop, motor was finished the expansion expansion stroke, and two scavenging pumps are also finished breathing process.
As shown in Figure 4, in the expansion expansion stroke, free piston assembly acts on the power F on the body
EngLeft, and the scavenging pump piston motion acts on the power F on the body
ScavAnd F '
ScavTo the right; Because F
EngBigger than other two power, so resultant direction is left, but the amplitude of making a concerted effort greatly reduces; The moment of torsion N that the active force of two scavenging pumps produces
1And N
2Therefore opposite sign but equal magnitude cancels out each other.Therefore in the expansion expansion stroke, can reduce the vibration of body.
Claims (4)
1, a kind of single-piston hydraulic free-piston engine with vibration damping scavenging pumps, it is characterized in that: burning piston (2) left side in the cylinder block is the burning cavity of two stroke diesel engine (1), the burning piston (2) the right side by piston rod (3) successively be contained in hydraulic cylinder in oil hydraulic pump piston (7) and compression piston (9) link to each other, scavenging port on the cylinder block (21) is by first scavenging pump and the second scavenging pump air supply opening (23 of pipeline PA and piston moving linearly, 23 ') link to each other, oil hydraulic pump piston (7) is divided into left and right sides two-part with the hydraulic pressure pump chamber in the hydraulic cylinder, right side hydraulic pressure pump chamber (8) links to each other with an end of high pressure accumulator (4) by first one-way valve (6), the other end of high pressure accumulator (4) links to each other with left side hydraulic pressure pump chamber (5) and load simultaneously, right side hydraulic pressure pump chamber (8) is by oil feed non-return valve group (20), second one-way valve (19) links to each other with low pressure accumulator (18) through the one 2/2 selector valve (17), the right side of compression piston (9) is compression chamber (13), it links to each other with low pressure accumulator (18) through the one 2/2 selector valve (17) by the 3rd one-way valve (16), compression chamber (13) also is connected with compress energy storage device (10) through FREQUENCY CONTROL valve (12) by the 4th one-way valve (11), be connected by the 2 2/2 selector valve (14) between low pressure accumulator (18) and the compress energy storage device (10), the scavenging piston of first scavenging pump and second scavenging pump is respectively by first, the second scavenging pump hydraulic piston (29,29 ') and first, second displacer (25,25 ') form, first, the second scavenging pump hydraulic piston (29,29 ') and first, second displacer (25,25 ') be contained in respectively in the scavenging pump cylinder body separately, scavenging pump first, the second scavenging pump hydraulic piston (29,29 ') hydraulic pressure cavity of scavenging pump is divided into two-part, wherein first, the second scavenging pump hydraulic pressure cavity (28,28 ') through first, the second stroke input end (27 of calming the anger, 27 ') link to each other with low pressure accumulator (18) by pipeline LP, first, the second suction stroke input end (26,26 ') link to each other with right side hydraulic pressure pump chamber (8) by pipeline PP, first of scavenging pump, second displacer (25,25 ') right side is first, second scavenging pump chamber (22 of calming the anger, 22 '), by scavenging pump intakeport (24,24 ') communicate with atmosphere A.
2, a kind of single-piston hydraulic free-piston engine according to claim 1 with vibration damping scavenging pumps, it is characterized in that: the stroke input end of calming the anger of described straight-line two scavenging pumps links to each other with right side hydraulic pressure pump chamber with the low pressure accumulator of hydraulic free-piston engine respectively with the suction stroke input end, the driving force that is straight-line two scavenging pumps is directly taken from the hydraulic system of hydraulic free-piston engine, and does not need independent drive system.
3, a kind of single-piston hydraulic free-piston engine with vibration damping scavenging pumps according to claim 2, it is characterized in that: the linear movement direction of described scavenging pump piston is opposite with the moving direction of hydraulic free-piston engine piston.
4, a kind of single-piston hydraulic free-piston engine according to claim 2 with vibration damping scavenging pumps, it is characterized in that: described two straight-line scavenging pump symmetries are installed in the both sides of hydraulic free-piston engine, and the center line three of its center line and hydraulic free-piston engine is in same plane and parallel with mounting base.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910097059A CN101520000A (en) | 2009-03-30 | 2009-03-30 | Single-piston hydraulic free-piston engine with vibration damping scavenging pumps |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910097059A CN101520000A (en) | 2009-03-30 | 2009-03-30 | Single-piston hydraulic free-piston engine with vibration damping scavenging pumps |
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| CN101520000A true CN101520000A (en) | 2009-09-02 |
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| CN200910097059A Pending CN101520000A (en) | 2009-03-30 | 2009-03-30 | Single-piston hydraulic free-piston engine with vibration damping scavenging pumps |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102705076A (en) * | 2012-06-19 | 2012-10-03 | 吉林大学 | Return flow scavenging type hydraulic free piston diesel engine |
| CN103511120A (en) * | 2013-09-22 | 2014-01-15 | 吉林大学 | Piston for free piston engine |
| CN104329164A (en) * | 2014-10-17 | 2015-02-04 | 华侨大学 | Free piston engine |
-
2009
- 2009-03-30 CN CN200910097059A patent/CN101520000A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102705076A (en) * | 2012-06-19 | 2012-10-03 | 吉林大学 | Return flow scavenging type hydraulic free piston diesel engine |
| CN103511120A (en) * | 2013-09-22 | 2014-01-15 | 吉林大学 | Piston for free piston engine |
| CN104329164A (en) * | 2014-10-17 | 2015-02-04 | 华侨大学 | Free piston engine |
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Open date: 20090902 |