CN202851217U - Diesel oil injection system driven by cylinder combustion pressure - Google Patents
Diesel oil injection system driven by cylinder combustion pressure Download PDFInfo
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- CN202851217U CN202851217U CN 201220452110 CN201220452110U CN202851217U CN 202851217 U CN202851217 U CN 202851217U CN 201220452110 CN201220452110 CN 201220452110 CN 201220452110 U CN201220452110 U CN 201220452110U CN 202851217 U CN202851217 U CN 202851217U
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Abstract
The invention discloses a diesel oil injection system driven by cylinder combustion pressure. The diesel oil injection system comprises a piston, an air intake duct, a cylinder cap, an inlet valve, a fuel inlet check valve, a fuel tank, a low-pressure fuel pump, an electric controlled fuel injector, a fuel inlet channel of the electric controlled fuel injector, an exhaust valve, an exhaust duct and a combustion chamber, wherein the cylinder cap is provided with a fuel supercharger composed of a fuel supercharger supercharging piston and a fuel supercharger check valve. The fuel supercharger supercharging piston is connected with the fuel supercharger check valve through a fuel inlet hole of the fuel supercharger check valve which is communicated with the electric controlled fuel injector through the fuel inlet channel of the electric controlled fuel injector. The fuel tank is connected with the fuel inlet check valve through the low-pressure fuel pump, and the fuel inlet check valve is connected with the fuel supercharger supercharging piston through the fuel inlet channel of the fuel supercharger. The diesel oil injection system is simple and compact in structure, small in size, high in energy utilization efficiency, and stable and reliable in operation.
Description
Technical field
The invention relates to a kind of automotive diesel oil ejecting system, is specifically related to a kind of pressure-actuated diesel injection system of cylinder combustion that utilizes.
Background technique
Internal-combustion engine has had the history in more than 100 year since coming out.As dynamic power machine, its thermal efficiency is high, simple in structure, specific mass is light, conveniently moving, is widely used in the fields such as communications and transportation, farm machinery, engineering machinery and generating, and the mankind's development tool is of great significance.At present, internal-combustion engine is as the highest motor of the thermal efficiency, and the power that sends accounts for 90% of all power plant total outputs of the whole world.Within quite long from now on period, internal-combustion engine will be in irreplaceable status because of its distinctive advantage.In existing internal-combustion engine, because diesel engine has the advantages such as the wide and good endurance of thermal efficiency height, power range, it is widely used, in the field such as the boats and ships of generating, engineering machinery, farm machinery and high and medium power and in occupation of dominant position.
Diesel engine mainly uses diesel oil.Diesel oil is the product of a kind of oil after the Petroleum refining.It is mixed by different hydrocarbons and forms, and main component is alkane, cycloalkanes or the aromatic hydrocarbons that contains 10 to 22 carbon atoms.Its chemistry and physical property are between gasoline and heavy oil, and boiling point is between 170 ℃ to 390 ℃.Because diesel oil is compared with the another kind of main fuel gasoline of internal-combustion engine, it is large to have viscosity, cetane number is high, therefore conventional diesel combustion mainly is to pass through high-pressure injection system, the diesel oil high pressure is sprayed in the cylinder of diesel engine, fuel through sending forth, heating evaporation, diffusion, mixing and initial oxidation etc. series of physical with set-up procedure chemistry, final burning, it is a kind of diffusive combustion.
Compare with petrol engine, diesel engine has that the thermal efficiency is higher, and moment of torsion is large, and the rotating speed during peak output is low, but diesel engine requires part to have higher structural strength and rigidity because working pressure is large, so diesel engine is relatively heavier, volume is larger; The Injection Pump of diesel engine and nozzle accuracy of manufacturing require high, so cost is higher; The power per liter index is not as petrol engine; Noise, the vibration higher; Particle (PM) and nitrogen oxide (NOX) discharging are more serious.Along with the in recent years progress of diesel technology, electric controlled direct spray, altogether rail, turbosupercharging, in a collection of advanced person's such as cold technology be able to use at diesel engine, the shortcoming that original diesel engine is existed has obtained certain improvement.
Fuel injection system is the very important parts of diesel engine, and it is related to engine fuel consumption and discharging.Because the requirement of energy shortage and environmental protection, engine fuel consumption and emission request are more and more higher.The diesel engines at present fuel injection system mainly contains three kinds of systems: mechanical pump fuel injection system, monoblock pump fuel injection system and high pressure common rail fuel injection system.
The mechanical pump fuel injection system can adopt the molded line etc. of Delivery Valves (constant pressure valve, orifice valve etc.), change camshaft to improve performance.The monoblock pump fuel injection system is at 1 high-pressure service pump of each cylinder assembling, and peak injection pressure can reach 200MPa.It is long and easy to maintenance that mechanical pump fuel injection system and monoblock pump fuel injection system have relative simple, the reliable performance of structure, failure rate is low, life-span.Above-mentioned two kinds of fuel injection systems are compared with high pressure common rail fuel injection system, and manufacturing process is relatively simple, and cost is lower, and product price is also low, and are not too responsive to the turbidity test (being impurity and arene) of oil product.
High pressure common rail fuel injection system adopts high-pressure fuel-feed pump, high pressure fuel is stored in orbit and keeps high pressure, relies on open and close controlling injection time and the fuel injection quantity of fuel injector magnetic system.The rail pressure of high-pressure common-rail injection system remains at setting value, is convenient to realize the flexible control of spraying realize easily the single cycle multi-injection.Solenoid Valve for Common Rail Systems once sprays at most can carry out bubbling, requires speed of response faster, and electronic control is had relatively high expectations.Rail rail pressure higher (being generally 150-180 MPa) welds and riveting process level requirement height altogether.Track and high-pressure oil pipe are under the hyperbaric environment all the time, and be high to the requirement of sealing material and metal material.The precision of each constituent element of high pressure common rail fuel injection system is all very high, the couple gap control is strict, and the part straightness accuracy is below 0.8 micron, and the couple gap is between the 1.5-3.7 micron, so the diesel oil cleaning degree has been proposed very high requirement, impurity meeting accelerated motion pair is worn and torn even is made it stuck.Thereby following the string rubber, the aromatic hydrocarbon in the oil product affects sealing.
Compare with the gasoline engine fuel ejecting system, three kinds of fuel injection systems of diesel engine all need the oil pump of elevated pressures, and manufacturing technology is higher, complex structure, and this has also increased breakdown in the motor.Simultaneously, the diesel fuel injection system cost is high.These three kinds of fuel injection systems are that kinetic energy by bent axle drives in addition, and the kinetic energy of bent axle is converted by the firing pressure in the cylinder, needs to consume more engine power.
Summary of the invention
The purpose of the invention is exactly the defective that overcomes above-mentioned prior art, designs a kind of pressure-actuated diesel injection system of cylinder combustion that utilizes, and concrete technological scheme is as follows:
A kind of pressure-actuated diesel injection system of cylinder combustion that utilizes, comprise piston, intake duct, cylinder head, intake valve, in line check valve, fuel tank, the fuel low-pressure pump, the electric-controlled fuel injector oil inlet passage, electric-controlled fuel injector, exhaust valve, air outlet flue, the firing chamber, intake duct and air outlet flue correspondence are arranged on the cylinder head, correspondence is equipped with intake valve and exhaust valve on intake duct and the air outlet flue, intake valve, exhaust valve, the space that forms between piston and the cylinder head is the firing chamber, electric-controlled fuel injector is installed on the cylinder head, the fuel pressurization device is installed on the described cylinder head, the fuel pressurization device is comprised of fuel pressurization device charged piston and fuel pressurization device one-way valve, fuel pressurization device charged piston is connected with fuel pressurization device one-way valve by fuel pressurization device one-way valve oil inlet hole, and fuel pressurization device one-way valve is communicated with electric-controlled fuel injector by the electric-controlled fuel injector oil inlet passage; Fuel tank is connected with in line check valve by the fuel low-pressure pump, and in line check valve is connected with fuel pressurization device charged piston by fuel pressurization device oil inlet passage.
Described fuel pressurization device charged piston comprises fuel pressurization device lower piston, fuel pressurization device piston rod, fuel pressurization device charged piston cavity of resorption, fuel pressurization device intermediate hole, fuel pressurization device intermediate cavity, fuel pressurization device charged piston epicoele, fuel pressurization device upper piston, fuel pressurization device charged piston spring, fuel pressurization device charged piston cavity of resorption is arranged on the cylinder head in the firing chamber, fuel pressurization device lower piston is positioned at fuel pressurization device charged piston cavity of resorption, fuel pressurization device upper piston is positioned at fuel pressurization device charged piston epicoele, fuel pressurization device lower piston is connected with fuel pressurization device upper piston by fuel pressurization device piston rod, fuel pressurization device piston rod is positioned at fuel pressurization device intermediate hole, fuel pressurization device charged piston spring housing be located on the fuel pressurization device piston rod and be positioned at fuel pressurization device upper piston below.
Described fuel pressurization device charged piston cavity of resorption is communicated with intake duct by fuel pressurization device through hole.So that the fuel oil of revealing in fuel pressurization device charged piston cavity of resorption enters intake duct by fuel pressurization device through hole, finally enter combustion chambers burn.
Described fuel pressurization device one-way valve comprises fuel pressurization device check valve spring, fuel pressurization device one-way valve valve pocket, fuel pressurization device Ball of Non-return, fuel pressurization device check valve spring and fuel pressurization device Ball of Non-return are installed on the fuel pressurization device one-way valve valve pocket successively, and fuel pressurization device Ball of Non-return matches with fuel pressurization device one-way valve oil inlet hole.
Described in line check valve comprises in line check valve valve ball, in line check valve valve pocket, in line check valve spring, in line check valve valve ball and in line check valve spring are installed on the in line check valve valve pocket successively, and the in line check valve valve ball matches with the in line check valve oil inlet hole.
Described fuel pressurization device is installed on the cylinder head of air inlet reveal.The fuel pressurization device is near intake valve, can utilize to enter the lower fresh air of burning room temperature fuel pressurization device lower piston is cooled off the heat load of reduce fuel oil pressurized machine lower piston when aspirating stroke.
The described pressure-actuated diesel injection system of cylinder combustion that utilizes of the invention, its beneficial effect is embodied in:
1. the invention is directly installed on the cylinder head, and volume is little, compact structure.
2. the invention is simple in structure, reduces the fault of diesel fuel engine injection system.
3. the invention has improved efficiency of energy utilization.Conventional high-pressure fuel pump of diesel engine is to be driven by bent axle, and the kinetic energy of bent axle is converted by the firing pressure in the cylinder, has reduced efficiency of energy utilization.
Description of drawings
Fig. 1 be the invention structural representation.
1 is piston among the figure, 2 is fuel pressurization device lower piston, 3 is fuel pressurization device piston rod, 4 is fuel pressurization device charged piston cavity of resorption, 5 is fuel pressurization device through hole, 6 is intake duct, 7 is fuel pressurization device intermediate hole, 8 is fuel pressurization device intermediate cavity, 9 is cylinder head, 10 is intake valve, 11 is fuel pressurization device oil inlet passage, 12 is the in line check valve valve pocket, 13 is the in line check valve spring, 14 is in line check valve, 15 is fuel tank, 16 is the fuel low-pressure pump, 17 is the in line check valve valve ball, 18 is fuel pressurization device one-way valve, 19 is the fuel pressurization device, 20 is the electric-controlled fuel injector oil inlet passage, 21 is fuel pressurization device check valve spring, 22 is fuel pressurization device one-way valve valve pocket, 23 is fuel pressurization device Ball of Non-return, 24 is fuel pressurization device one-way valve oil inlet hole, 25 is fuel pressurization device charged piston epicoele, 26 is fuel pressurization device upper piston, 27 is fuel pressurization device charged piston spring, 28 is fuel pressurization device charged piston, 29 is electric-controlled fuel injector, 30 is exhaust valve, 31 is air outlet flue, 32 is the firing chamber.
Embodiment
Below in conjunction with accompanying drawing, further specify the present invention with embodiment.But this embodiment only is illustrative, and the protection domain of the invention is not subjected to this embodiment's restriction.
Shown in Figure 1, the specific embodiments of utilizing the pressure-actuated diesel injection system of cylinder combustion of the invention, it comprises piston 1, intake duct 6, cylinder head 9, intake valve 10, in line check valve 14, fuel tank 15, fuel low-pressure pump 16, electric-controlled fuel injector oil inlet passage 20, electric-controlled fuel injector 29, exhaust valve 30, air outlet flue 31, firing chamber 32, intake duct 6 and air outlet flue 31 correspondences are arranged on the cylinder head 9, correspondence is equipped with intake valve 10 and exhaust valve 30 on intake duct 6 and the air outlet flue 31, intake valve 10, exhaust valve 30, the space that forms between piston 1 and the cylinder head 9 is firing chamber 32, electric-controlled fuel injector 29 is installed on the cylinder head 9, on the described cylinder head 9 fuel pressurization device 19 is installed, fuel pressurization device 19 is comprised of fuel pressurization device charged piston 28 and fuel pressurization device one-way valve 18, fuel pressurization device charged piston 28 is connected with fuel pressurization device one-way valve 18 by fuel pressurization device one-way valve oil inlet hole 24, and fuel pressurization device one-way valve 18 is communicated with electric-controlled fuel injector 29 by electric-controlled fuel injector oil inlet passage 20; Fuel tank 15 is connected with in line check valve 14 by fuel low-pressure pump 16, and in line check valve 14 is connected with fuel pressurization device charged piston (28) by fuel pressurization device oil inlet passage 11.Described fuel pressurization device charged piston 28 comprises fuel pressurization device lower piston 2, fuel pressurization device piston rod 3, fuel pressurization device charged piston cavity of resorption 4, fuel pressurization device intermediate hole 7, fuel pressurization device intermediate cavity 8, fuel pressurization device charged piston epicoele 25, fuel pressurization device upper piston 26, fuel pressurization device charged piston spring 27, fuel pressurization device charged piston cavity of resorption 4 is arranged on the cylinder head 9 in the firing chamber 32, fuel pressurization device lower piston 2 is positioned at fuel pressurization device charged piston cavity of resorption 4, fuel pressurization device upper piston 26 is positioned at fuel pressurization device charged piston epicoele 25, fuel pressurization device lower piston 2 is connected with fuel pressurization device upper piston 26 by fuel pressurization device piston rod 3, fuel pressurization device piston rod 3 is positioned at fuel pressurization device intermediate hole 7, fuel pressurization device charged piston spring 27 be set on the fuel pressurization device piston rod 3 and be positioned at fuel pressurization device upper piston 26 below.
Described fuel pressurization device charged piston cavity of resorption 4 is communicated with intake duct 6 by fuel pressurization device through hole 5, so that the fuel oil of revealing in fuel pressurization device charged piston cavity of resorption 4 enters intake duct 6 by fuel pressurization device through hole 5, finally enters firing chamber 32 burnings.Described fuel pressurization device 19 is installed on the cylinder head 9 of intake valve 10 sides, can utilize to enter the lower fresh air of firing chamber 32 interior temperature fuel pressurization device lower piston 2 is cooled off the heat load of reduce fuel oil pressurized machine lower piston 2 when aspirating stroke.
Described fuel pressurization device one-way valve 18 comprises fuel pressurization device check valve spring 21, fuel pressurization device one-way valve valve pocket 22, fuel pressurization device Ball of Non-return 23, fuel pressurization device check valve spring 21 and fuel pressurization device Ball of Non-return 23 are installed on the fuel pressurization device one-way valve valve pocket 22 successively, and fuel pressurization device Ball of Non-return 23 matches with fuel pressurization device one-way valve oil inlet hole 24.Described in line check valve 14 comprises in line check valve valve ball 17, in line check valve valve pocket 12, in line check valve spring 13, in line check valve valve ball 17 and in line check valve spring 13 are installed on the in line check valve valve pocket 12 successively, and in line check valve valve ball 17 matches with the in line check valve oil inlet hole.
The below illustrates as an example of quartastroke engine example and utilizes the pressure-actuated diesel injection system working procedure of cylinder combustion.In the compression stroke later stage, when piston 1 moved near the top dead center, electric-controlled fuel injector 29 began fuel oil is sprayed in the firing chamber 32, and power stroke begins.After power stroke begins, firing chamber 32 interior gas pressures sharply increase, move on the fuel pressurization device charged piston 28, fuel pressurization device upper piston 26 moves upward thereupon, fuel pressurization device charged piston epicoele 25 and in line check valve 14 are disconnected, fuel oil in the fuel pressurization device upper piston 26 compression fuel pressurization device charged piston epicoeles 25, fuel pressure in the fuel pressurization device charged piston epicoele 25 raises, fuel oil in the fuel pressurization device charged piston epicoele 25 backs down the fuel pressurization device Ball of Non-return 23 in the fuel pressurization device one-way valve 18, make the supercharging fuel in the fuel pressurization device charged piston epicoele 25 enter fuel pressurization device one-way valve valve pocket 22 by fuel pressurization device one-way valve oil inlet hole 24, the fuel oil that enters in the fuel pressurization device one-way valve valve pocket 22 enters electric-controlled fuel injector 29 by electric-controlled fuel injector oil inlet passage 20 again.Fuel low-pressure pump 16 with the fuel pressurization in the fuel tank 15 to about 0.5 MPa.General internal-combustion engine maximum combustion pressure is 8-12 MPa, if the maximum combustion pressure in the firing chamber 32 is 9MPa, the pressure ratio of fuel pressurization device charged piston 28 is 12:1, and then supercharging fuel is the highest can reach 108 MPa.
Complete when the work done stroke, exhaust stroke begins, and intake valve 10 is closed, and exhaust valve 30 is opened, and waste gas enters in the air outlet flue 31 from firing chamber 32, and firing chamber 32 interior gas pressures reduce.Fuel pressurization device charged piston 28 moves down, fuel pressurization device charged piston epicoele 25 and fuel pressurization device one-way valve valve pocket 22 interior fuel pressures reduce, under the effect of fuel pressurization device check valve spring 21 spring forces, fuel pressurization device Ball of Non-return 23 is taken a seat, fuel pressurization device charged piston epicoele 25 and fuel pressurization device one-way valve valve pocket 22 are disconnected, and fuel pressurization device charged piston epicoele 25 interior fuel oils still keep higher pressure.
After exhaust stroke finished, aspirating stroke began, and intake valve 10 is opened, and exhaust valve 30 cuts out, and piston 1 is descending, firing chamber 32 interior generation negative pressure, and fresh air enters firing chamber 32 from intake duct 6.Because firing chamber 32 internal pressures are lower, fuel pressurization device charged piston 28 continues to move down, and in line check valve 14 is communicated with fuel pressurization device charged piston epicoele 25 by fuel pressurization device oil inlet passage 11.In line check valve 14 interior fuel oils through 16 superchargings of fuel low-pressure pump enter fuel pressurization device charged piston epicoele 25 by fuel pressurization device oil inlet passage 11.
When aspirating stroke finishes, the beginning compression stroke, piston 1 is up, intake valve 10 and exhaust valve 30 are closed, piston compression and combustion chamber 1 32 interior air, air pressure is raise, and firing chamber 32 interior air produce pressure to fuel pressurization device lower piston 2, utilize the pressure-actuated diesel injection system of cylinder combustion to begin new work cycle.
Claims (6)
1. one kind is utilized the pressure-actuated diesel injection system of cylinder combustion, comprise piston (1), intake duct (6), cylinder head (9), intake valve (10), in line check valve (14), fuel tank (15), fuel low-pressure pump (16), electric-controlled fuel injector oil inlet passage (20), electric-controlled fuel injector (29), exhaust valve (30), air outlet flue (31), firing chamber (32), intake duct (6) and air outlet flue (31) correspondence are arranged on the cylinder head (9), the upper correspondence of intake duct (6) and air outlet flue (31) is equipped with intake valve (10) and exhaust valve (30), intake valve (10), exhaust valve (30), the space that forms between piston (1) and the cylinder head (9) is firing chamber (32), electric-controlled fuel injector (29) is installed on the cylinder head (9), it is characterized in that: fuel pressurization device (19) is installed on the described cylinder head (9), fuel pressurization device (19) is comprised of fuel pressurization device charged piston (28) and fuel pressurization device one-way valve (18), fuel pressurization device charged piston (28) is connected with fuel pressurization device one-way valve (18) by fuel pressurization device one-way valve oil inlet hole (24), and fuel pressurization device one-way valve (18) is communicated with electric-controlled fuel injector (29) by electric-controlled fuel injector oil inlet passage (20); Fuel tank (15) is connected with in line check valve (14) by fuel low-pressure pump (16), and in line check valve (14) is connected with fuel pressurization device charged piston (28) by fuel pressurization device oil inlet passage (11).
2. the pressure-actuated diesel injection system of cylinder combustion that utilizes according to claim 1, it is characterized in that: described fuel pressurization device charged piston (28) comprises fuel pressurization device lower piston (2), fuel pressurization device piston rod (3), fuel pressurization device charged piston cavity of resorption (4), fuel pressurization device intermediate hole (7), fuel pressurization device intermediate cavity (8), fuel pressurization device charged piston epicoele (25), fuel pressurization device upper piston (26), fuel pressurization device charged piston spring (27), fuel pressurization device charged piston cavity of resorption (4) is arranged on the interior cylinder head (9) in firing chamber (32), fuel pressurization device lower piston (2) is positioned at fuel pressurization device charged piston cavity of resorption (4), fuel pressurization device upper piston (26) is positioned at fuel pressurization device charged piston epicoele (25), fuel pressurization device lower piston (2) is connected with fuel pressurization device upper piston (26) by fuel pressurization device piston rod (3), fuel pressurization device piston rod (3) is positioned at fuel pressurization device intermediate hole (7), fuel pressurization device charged piston spring (27) be set in fuel pressurization device piston rod (3) upper and be positioned at fuel pressurization device upper piston (26) below.
3. the pressure-actuated diesel injection system of cylinder combustion that utilizes according to claim 2 is characterized in that: described fuel pressurization device charged piston cavity of resorption (4) is communicated with intake duct (6) by fuel pressurization device through hole (5).
4. according to claim 1 and 2 or the 3 described pressure-actuated diesel injection systems of cylinder combustion that utilize, it is characterized in that: described fuel pressurization device one-way valve (18) comprises fuel pressurization device check valve spring (21), fuel pressurization device one-way valve valve pocket (22), fuel pressurization device Ball of Non-return (23), fuel pressurization device check valve spring (21) and fuel pressurization device Ball of Non-return (23) are installed on the fuel pressurization device one-way valve valve pocket (22) successively, and fuel pressurization device Ball of Non-return (23) matches with fuel pressurization device one-way valve oil inlet hole (24).
5. the pressure-actuated diesel injection system of cylinder combustion that utilizes according to claim 4, it is characterized in that: described in line check valve (14) comprises in line check valve valve ball (17), in line check valve valve pocket (12), in line check valve spring (13), in line check valve valve ball (17) and in line check valve spring (13) are installed on the in line check valve valve pocket (12) successively, and in line check valve valve ball (17) matches with the in line check valve oil inlet hole.
6. the pressure-actuated diesel injection system of cylinder combustion that utilizes according to claim 5, it is characterized in that: described fuel pressurization device (19) is installed on the cylinder head (9) of intake valve (10) side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220452110 CN202851217U (en) | 2012-09-07 | 2012-09-07 | Diesel oil injection system driven by cylinder combustion pressure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220452110 CN202851217U (en) | 2012-09-07 | 2012-09-07 | Diesel oil injection system driven by cylinder combustion pressure |
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| CN202851217U true CN202851217U (en) | 2013-04-03 |
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| CN 201220452110 Expired - Fee Related CN202851217U (en) | 2012-09-07 | 2012-09-07 | Diesel oil injection system driven by cylinder combustion pressure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102865170A (en) * | 2012-09-07 | 2013-01-09 | 金华三人科技有限公司 | Diesel fuel injection system driven by utilizing combustion pressure of air cylinder |
-
2012
- 2012-09-07 CN CN 201220452110 patent/CN202851217U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102865170A (en) * | 2012-09-07 | 2013-01-09 | 金华三人科技有限公司 | Diesel fuel injection system driven by utilizing combustion pressure of air cylinder |
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