CN208073659U - A kind of overcritical fuel injection system - Google Patents
A kind of overcritical fuel injection system Download PDFInfo
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- CN208073659U CN208073659U CN201721666950.3U CN201721666950U CN208073659U CN 208073659 U CN208073659 U CN 208073659U CN 201721666950 U CN201721666950 U CN 201721666950U CN 208073659 U CN208073659 U CN 208073659U
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Abstract
The utility model is related to a kind of overcritical fuel injection systems, belong to combustion in IC engine and fuel oil supercritical spraying technique field.Include mainly fuel tank, high-pressure oil pump, high-pressure common-rail pipe, fuel Heating pipe, electromagnetic fuel heating unit, common-rail injector, high temperature oil return line, oil return water cooling plant, oil storage tank, pressure sensor, thermocouple and electronic control unit.Fuel from fuel tank pressurization is pumped into high-pressure common-rail pipe by high-pressure oil pump；Electromagnetic fuel heating unit is by fuel Heating to above-critical state；Electronic control unit handles the signal from pressure sensor and thermocouple, controls common-rail injector oil spout；Oil return water cooling plant is cooling by high temperature oil return and imports oil storage tank by high temperature oil return line.Compared with prior art, the utility model by fuel heating by being forced into above-critical state, the atomizing effect of fuel oil and fuel oil delay period is shortened when enhancing injection so that combustion process can be controlled and improved by the personalized customization of injection pulse, to improve internal combustion engine thermal efficiency.
Description
Technical field
The present invention relates to a kind of overcritical fuel injection systems, belong to combustion in IC engine and fuel oil supercritical spraying technique neck
Domain.
Background technology
Fuel of internal combustion engine atomization technique has become one of the Main way of contemporary internal combustion engine spraying technique.Traditional liquid is fired
Expecting in course of injection can there is a phenomenon where first atomization, secondary-atomizing and drop evaporation, these processes, and fuel oil delay period to be caused to increase
Add, Combustion Process Control difficulty is made to increase, in-cylinder combustion degree of constant volume declines, and eventually leads to the reduction of internal combustion engine thermal efficiency.
At the same time, the high pressure co-rail system of Modern Internal-Combustion Engine realizes the injection pressure for being three times in traditional combustion engine, this
Aggravate fuel oil shattering process to a certain extent, reduces spray particle diameter.But it is still in liquid phase state in time for spraying fuel oil,
Fuel-oil atmozation technology still has very big Improvement.
Traditional fuel mode of heating is electrical heating, and electric energy is converted to the thermal energy of resistance wire, is passed energy by heat transfer
It is delivered on material.Most of heat is dissipated in air, and energy loss is huge, and the efficiency of heating surface is low.In contrast, electromagnetic induction
Heat energy transformation efficiency is high, and heat loss is less and homogeneous heating, can significantly reduce environment temperature.
Studies have shown that oil temperature has significant impact to spray characteristic.When the temperature of fuel is continuously improved, fuel reforms into
Carry the fluid of certain degree of superheat.When fuel temperature is more than its critical point, fuel oil is in a supercritical state.Supercritical fluid
With the property between liquid and gaseous state between the two, with surface tension is smaller, viscosity is smaller and diffusion coefficient is larger
Feature.In the course of injection of fuel, it is in fuel particle diameter two orders of magnitude smaller than liquid spray of above-critical state.In this way
The mixed gas of high quality can be quickly prepared, is made to play good improvement to the atomization of liquid fuel and combustion process
With.
Invention content
The present invention is to solve IC engine cylinder internal combustion to burn the undesirable present situation of fuel-oil atmozation, proposes a kind of overcritical fuel oil injection system
System, for studying overcritical fuel-oil atmozation process.
The purpose of the present invention is achieved through the following technical solutions：
A kind of overcritical fuel injection system includes mainly fuel tank, high-pressure oil pump, high-pressure oil pump oil inlet pipe, high-pressure oil pump
Flowline, high-pressure oil pump overflow pipe, high-pressure common-rail pipe, common rail-heating communicating pipe, fuel Heating pipe, electromagnetic fuel heating unit,
Common-rail injector, high temperature oil return line, oil return water cooling plant, oil storage tank, pressure sensor, thermocouple and electronic control are single
Member；
Wherein, the fuel Heating pipe is made of the higher carbon steel of magnetic conductivity；The outer surface of fuel Heating pipe is laid with
High temperature resistant asbestos pad；High temperature oil return line can also use other that can reinforce the cloth of cooling effect using arrangement is folded
Set mode；Oil return water cooling plant has cooling water inlet and cooling water outlet；It is provided with pressure compensation opening above oil storage tank；Electronics control
Unit processed is implanted with the program opened and closed according to pressure sensor and thermocouple signal control common-rail injector solenoid valve；
High-pressure oil pump has input, output end and effluent head；High-pressure common-rail pipe has input terminal and output end；Fuel oil adds
Heat pipe has input terminal and output end；High temperature oil return line has input terminal and output end.
A kind of connection relation of each component part of overcritical fuel injection system is as follows：
The high-pressure oil pump is connect with high-pressure common-rail pipe and fuel tank, and output end and the high-pressure common-rail pipe of high-pressure oil pump input
End connection；Input terminal, the effluent head of high-pressure oil pump are connected with fuel tank；High-pressure common-rail pipe output end connects the input of fuel Heating pipe
End；Fuel Heating pipe output end connects common-rail injector；Common-rail injector oil return opening is connect with high temperature oil return line input terminal；It is high
Warm oil return line output end connects oil storage tank；Pressure sensor, thermocouple, common-rail injector are connect with electronic control unit；
High-pressure oil pump output end connects high-pressure common-rail pipe by high-pressure oil pump flowline；High-pressure oil pump input terminal passes through high-pressure oil pump oil inlet
Pipe is connect with fuel tank；High-pressure oil pump effluent head is connect by high-pressure oil pump overflow pipe with fuel tank；High-pressure common-rail pipe output end passes through
Common rail-heating communicating pipe connect with fuel Heating pipe input terminal；Fuel Heating pipe output end by common-rail injector oil input channel with
Common-rail injector connects；
A kind of assembly connection relationship of each component part of overcritical fuel injection system is as follows：
Pressure sensor is mounted on high-pressure common-rail pipe；The installation of TC is on fuel Heating pipe；Electromagnetic fuel heating is single
The heating coil of member is wound around on the outside of high temperature asbestos pad, and accesses high-frequency alternating current；The oil return water cooling plant is fixed on
High temperature oil return line outer surface；The cooling water inlet of oil return water cooling plant is arranged in high temperature oil return line downstream, cooling water outlet
It is arranged in high temperature oil return line upstream, to reinforce cooling effect；
A kind of each composition partial function in overcritical fuel injection system is as follows：
Fuel tank is for storing fuel oil；High-pressure oil pump is for providing high pressure fuel；High-pressure oil pump oil inlet pipe and high pressure oil pump out
Oil pipe is used for the conveying of fuel oil；High-pressure oil pump overflow pipe is for limiting high-pressure oil pump fuel transfer pressure；High-pressure common-rail pipe is for storing
And conveying high-pressure fuel oil；Fuel Heating pipe is used for the storage and heating of fuel oil；Electromagnetic fuel heating unit is used for fuel Heating
Pipe provides heat；Common-rail injector carries out overcritical fuel oil injection for receiving the pulse signal from electronic control unit；It is high
Warm oil return line is used for oil return is cooling and imports oil storage tank；Oil storage tank is for collecting oil return after cooling；Oil return water cooling plant
For the above-critical state fuel oil in high temperature oil return line to be condensed；Pressure sensor is for monitoring high-pressure common-rail pipe intermediate fuel oil pressure
Power；Thermocouple is used to monitor the fuel oil temperature in fuel Heating pipe；Electronic control unit for handling from pressure sensor and
The signal of thermocouple controls common-rail injector oil spout；High temperature resistant asbestos pad is for preventing fuel Heating pipe high temperature surface by electromagnetism
Heating coil is burnt out.
Advantageous effect
The present invention relates to a kind of overcritical fuel injection systems to have the advantages that compared with prior art：
1. the present invention adds fuel oil using electromagnetic fuel heating unit on the basis of high pressure co-rail system pressurizes to fuel oil
Fuel Heating in heat pipe makes fuel oil reach supercriticality in common-rail injector body to above-critical state；
2. compared with conventional fuel oil mode of heating, electromagnetic fuel heating unit energy conversion efficiency is high, heating speed is fast, right
Material homogeneous heating, and operating ambient temperature is relatively low；
3. conventional fuel oil injection need to pass through first atomization, secondary-atomizing and the lengthy procedure for being crushed evaporation of fuel oil, this
Invention effectively avoids this process, and it is above-critical state that fuel oil, which sprays,；
4. conventional fuel oil spraying system spray particle diameter is about 10 μm, the fuel spray grain size in the present invention can reduce two numbers
Magnitude, air-fuel mixture are more abundant；
5. greatly shortening fuel oil delay period, burn rate is set only to be influenced by injection rate, combustion process is more controllable.Together
When can by internal combustion engine thermal efficiency improve 3%~5%；
6. overcritical fuel oil injection allows in-cylinder combustion process to be controlled by the personalized customization of injection pulse
And improvement.
Description of the drawings
Fig. 1 is a kind of structural schematic diagram of overcritical fuel injection system of the present invention；
In Fig. 1：1- fuel tanks；2- high-pressure oil pumps；3- high-pressure oil pump overflow pipes；4- high-pressure oil pump oil inlet pipes；5- high-pressure oil pumps
Flowline；6- high-pressure common-rail pipes；7- common rails-heating communicating pipe；8- fuel Heating pipes；9- electromagnetic fuel heating coils；10- fuel oils
Electromagnetic heating unit；11- common-rail injector oil input channels；12- common-rail injectors；13- high temperature oil return lines；14- oil return water coolings fill
It sets；15- oil storage tanks；16- pressure sensors；17- thermocouples；18- electronic control units；19- cooling water outlets；20- cooling waters
Entrance；21- pressure compensation openings.
Specific implementation mode
The present invention is described in detail with specific example below in conjunction with the accompanying drawings.
Embodiment 1
The present embodiment describes a kind of composition of overcritical fuel injection system of the present invention, assembly connection relationship and specific reality
It applies.
A kind of composition of overcritical fuel injection system and connection are as shown in Figure 1.1 is fuel tank in Fig. 1；2 be high-pressure oil pump；
3 be high-pressure oil pump overflow pipe；4 be high-pressure oil pump oil inlet pipe；5 be high-pressure oil pump flowline；6 be high-pressure common-rail pipe；7 be common rail-
Heat communicating pipe；8 be fuel Heating pipe；9 be electromagnetic fuel heating coil；10 be electromagnetic fuel heating unit；11 spray for common rail
Oily device oil input channel；12 be common-rail injector；13 be high temperature oil return line；14 be oil return water cooling plant；15 be oil storage tank；16 be pressure
Force snesor；17 be thermocouple；18 be electronic control unit；19 be cooling water outlet；20 be cooling water inlet；21 is flat for pressure
Weighing apparatus hole.
From figure 1 it appears that 2 output end of high-pressure oil pump is connected with high-pressure common-rail pipe 6 by high-pressure oil pump flowline, it is high
2 input terminal of pressure oil pump and effluent head are connect by high-pressure oil pump oil inlet pipe 4 and high-pressure oil pump overflow pipe 3 with fuel tank 1 respectively, high pressure
Fuel oil in fuel tank is pressed and delivered to high-pressure common-rail pipe by oil pump.The fuel Heating pipe 8 is arranged under high-pressure common-rail pipe 6
Trip is connected by common rail-heating communicating pipe 7 therebetween.Fuel Heating pipe 8 and common-rail injector 12 by common-rail injector into
Oil duct 11 is connected to.Common-rail injector 12 is connect with high temperature oil return line 13；High temperature oil return line 13 connects oil storage tank 15；Pressure passes
Sensor 16, thermocouple 17, common-rail injector 12 are connect with electronic control unit 18；The fuel oil electricity of electromagnetic fuel heating unit 10
Magnetic heating coil 9 is wound around on the outside of high temperature asbestos pad；Oil return water cooling plant 14 is fixed on 13 outer surface of high temperature oil return line；
The present embodiment is pumped into when it is implemented, the generation 100Mpa high pressure fuels of high-pressure oil pump 2 through high-pressure oil pump flowline 5
High-pressure common-rail pipe 6.High-pressure common-rail pipe intermediate fuel oil pressure is consistent with fuel Heating pipe；Electromagnetic fuel heating unit 10 accesses high frequency and hands over
Galvanic electricity, by controlling heating power by 8 mesohigh fuel Heating of fuel Heating pipe to 400 DEG C of target temperature；Above-critical state fuel oil
Common-rail injector 12 is fed by common-rail injector oil input channel 11, when common-rail injector solenoid valve is opened, overcritical fuel oil is by spraying
Mouth sprays.Spray particle diameter is reduced two orders of magnitude by the injection of overcritical fuel oil, shortens fuel oil delay period, make burn rate only by
Injection rate influences, while improving internal combustion engine thermal efficiency；Part high temp oil-fired is exported by high temperature oil return line 13, flows through oil return
Water cooling plant 14.Fuel oil in high temperature oil return line passes through oil return water cooling plant exothermic condensation, is changed into liquid by above-critical state,
Import oil storage tank 15.
The present embodiment is when it is implemented, when fuel oil temperature reaches 400 DEG C of target temperature, by electromagnetic fuel heating unit work(
Rate tune is steady.It is when fuel pressure reaches goal pressure 100Mpa, pump oil pressure tune is steady.Pressure sensor 16 acquires high pressure in real time
Fuel pressure in common rail pipe 6, thermocouple 17 acquire the temperature in fuel Heating pipe 8 in real time.Electronic control unit 18 is by the two
Signal is compared with fuel oil supercritical point thermodynamic parameter, when thermocouple, pressure sensor signal meet condition, electronics control
Unit 18 processed sends pulse signal control fuel injector magnetic system to common-rail injector and opens and closes, and realizes fuel oil supercritical injection.It is super to face
Boundary's fuel oil injection allows in-cylinder combustion process to be controlled and improved by the personalized customization of injection pulse.
It is above-mentioned that example must be described to be easy for one of ordinary skill in the field to understand and apply the invention.It is familiar with ability
The skill personnel in domain obviously can make the technology various modifications, and technical principle described herein is applied in other examples
Without passing through creative work.Therefore, example that the invention is not limited thereto.Those skilled in the art's announcement according to the present invention,
It does not depart from any improvement that scope is made and modification all should be within protection scope of the present invention.
Claims (1)
1. a kind of overcritical fuel injection system, it is characterised in that：Mainly include fuel tank, high-pressure oil pump, high-pressure oil pump oil inlet pipe,
High-pressure oil pump flowline, high-pressure oil pump overflow pipe, high-pressure common-rail pipe, common rail-heating communicating pipe, fuel Heating pipe, electromagnetic fuel
Heating unit, common-rail injector, high temperature oil return line, oil return water cooling plant, oil storage tank, pressure sensor, thermocouple and electricity
Sub-control unit；
Wherein, the fuel Heating pipe is made of carbon steel；The outer surface of fuel Heating pipe is laid with high temperature resistant asbestos pad；High temperature
Oil return line is using folding arrangement；Oil return water cooling plant has cooling water inlet and cooling water outlet；It is opened above oil storage tank
There is pressure compensation opening；Electronic control unit is implanted with to be opened according to pressure sensor and thermocouple signal control common-rail injector solenoid valve
The program closed；
High-pressure oil pump has input, output end and effluent head；High-pressure common-rail pipe has input terminal and output end；Fuel Heating pipe
With input terminal and output end；High temperature oil return line has input terminal and output end；
The high-pressure oil pump is connect with high-pressure common-rail pipe and fuel tank, and output end and the high-pressure common-rail pipe input terminal of high-pressure oil pump connect
It connects；Input terminal, the effluent head of high-pressure oil pump are connected with fuel tank；High-pressure common-rail pipe output end connects fuel Heating pipe input terminal；Combustion
Oily heating tube output end connects common-rail injector；Common-rail injector oil return opening is connect with high temperature oil return line input terminal；High temperature returns
Oil pipe line output end connects oil storage tank；Pressure sensor, thermocouple, common-rail injector are connect with electronic control unit；High pressure
Oil pump output end connects high-pressure common-rail pipe by high-pressure oil pump flowline；High-pressure oil pump input terminal by high-pressure oil pump oil inlet pipe with
Fuel tank connects；High-pressure oil pump effluent head is connect by high-pressure oil pump overflow pipe with fuel tank；High-pressure common-rail pipe output end passes through common rail-
Heating is connect communicating pipe with fuel Heating pipe input terminal；Fuel Heating pipe output end is sprayed by common-rail injector oil input channel and common rail
Oily device connection；
A kind of assembly connection relationship of each component part of overcritical fuel injection system is as follows：
Pressure sensor is mounted on high-pressure common-rail pipe；The installation of TC is on fuel Heating pipe；Electromagnetic fuel heating unit
Heating coil is wound around on the outside of high temperature asbestos pad, and accesses high-frequency alternating current；The oil return water cooling plant is fixed on high temperature
Oil return line outer surface；The cooling water inlet setting of oil return water cooling plant is in high temperature oil return line downstream, cooling water outlet setting
In high temperature oil return line upstream, to reinforce cooling effect；
A kind of each composition partial function in overcritical fuel injection system is as follows：
Fuel tank is for storing fuel oil；High-pressure oil pump is for providing high pressure fuel；High-pressure oil pump oil inlet pipe and high-pressure oil pump flowline
Conveying for fuel oil；High-pressure oil pump overflow pipe is for limiting high-pressure oil pump fuel transfer pressure；High-pressure common-rail pipe for store and it is defeated
Send high pressure fuel；Fuel Heating pipe is used for the storage and heating of fuel oil；Electromagnetic fuel heating unit to fuel Heating pipe for carrying
Heating load；Common-rail injector carries out overcritical fuel oil injection for receiving the pulse signal from electronic control unit；High temperature returns
Oil pipe line is used for oil return is cooling and imports oil storage tank；Oil storage tank is for collecting oil return after cooling；Oil return water cooling plant is used for
By the above-critical state fuel oil condensation in high temperature oil return line；Pressure sensor is for monitoring high-pressure common-rail pipe intermediate fuel oil pressure；Heat
Galvanic couple is used to monitor the fuel oil temperature in fuel Heating pipe；Electronic control unit comes from pressure sensor and thermocouple for handling
Signal, control common-rail injector oil spout；High temperature resistant asbestos pad is for preventing fuel Heating pipe high temperature surface by electromagnetic heating line
Circle is burnt out.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721666950.3U CN208073659U (en) | 2017-12-05 | 2017-12-05 | A kind of overcritical fuel injection system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721666950.3U CN208073659U (en) | 2017-12-05 | 2017-12-05 | A kind of overcritical fuel injection system |
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| CN208073659U true CN208073659U (en) | 2018-11-09 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107806386A (en) * | 2017-12-05 | 2018-03-16 | 北京理工大学 | A kind of overcritical fuel injection system |
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2017
- 2017-12-05 CN CN201721666950.3U patent/CN208073659U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107806386A (en) * | 2017-12-05 | 2018-03-16 | 北京理工大学 | A kind of overcritical fuel injection system |
| CN107806386B (en) * | 2017-12-05 | 2024-03-12 | 北京理工大学 | Supercritical fuel injection system |
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