CN100520040C

CN100520040C - Vacuum contant pressure, mixer for internal combustion engine

Info

Publication number: CN100520040C
Application number: CNB2005100546327A
Authority: CN
Inventors: 蒙国宁
Original assignee: Individual
Current assignee: Individual
Priority date: 2005-03-07
Filing date: 2005-03-07
Publication date: 2009-07-29
Anticipated expiration: 2025-03-07
Also published as: CN1673514A

Abstract

The constant vacuum degree mixer is used for oil burning engine, gas burning engine and oil and/or gas burning engine. Using the constant vacuum degree mixer in engine can make automobile and motorcycle saving energy by over 15 %, possessing excellent starting performance, stable idle performance, accurate gas distribution and greatly lowered exhaust pollution. The present invention has simple structure, low cost and high producibility.

Description

The vacuum contant pressure mixer that is used for explosive motor

Technical field

The invention belongs to the explosive motor field.

Background technique

Existing venturi type mixer and proportion expression mixer do not have air inlet constant voltage function, and the allowable compression ratio that can not improve motor under the constant prerequisite of fuel antiknock ability reaches energy-conservation purpose; On the other hand, the ratio of the air jet of these two kinds of mixers and combustion gas metering-orifice remains constant, mixture strength can't change with the reasonable need of the various operating modes of motor, the power character and the Economy of motor high and low rotating speed are particularly thorny, cause part operating mode incomplete combustion, less economical, discharge bad, float amount motorcycle starting difficulty, unstable idle; The venturi type mixer is in order to satisfy the air input of engine by air needs, air jet can not be too small, when idling operation and state of starting operating, mixer trunnion place can't produce the combustible gas in the effective sucking-off combustion gas of the enough degree of vacuum metering-orifice, mixture strength is difficult to reach the requirement (particularly small-displacement engine of motorcycle) of state of starting operating and idling operation, cause the engine start difficulty, unstable idle, discharging increases; The state of starting operating fuel gas supply of proportion expression mixer motor adopts the malleation air feed, can't supply with the combustible gas of fair amount according to air jet leaked-in air quantity, the mixture strength of the state of starting operating of motor can't be stabilized in reasonable value, cause the instability of motor starting characteristic, idle exhaust emission is bad.

Summary of the invention

The objective of the invention is: under the constant prerequisite of fuel antiknock ability, improve the allowable compression ratio of motor, improve fuel thermal efficiency, reduce burnup; On the other hand, satisfy of the reasonable request of the various operating modes of gas engine simultaneously, solve that existing mixer part operating mode mixture strength is unreasonable, the technical problem of incomplete combustion and the starting difficulty that the combustion gas of float amount motorcycle is started, the technical problem of idling performance difference mixture strength.

The present invention realizes its purpose in the following manner: " the vacuum contant pressure mixer that is used for explosive motor " (a following abbreviation mixer) is installed between engine air throttle and air-strainer, and mixer is made up of mixing body, by-pass cock, constant force spring; Mix in the body air jet, combustion gas metering-orifice, air outlet hole are arranged; Mixing body is the carrier and the counterpart of by-pass cock, constant force spring; Air jet is connected with air-strainer, and the combustion gas metering-orifice is connected with reduction valve, and air outlet hole is connected with the air inlet road junction of closure; By-pass cock is installed in the mixing body between air jet, combustion gas metering-orifice, the air outlet hole, air jet, combustion gas metering-orifice, air outlet hole separated, and can to-and-fro motion in mixing body; By-pass cock top is corresponding with air jet, the size of control air jet, the middle part cooperates the size of control combustion gas metering-orifice with the combustion gas metering-orifice, top communicates with atmosphere through air filter, accepts the atmospheric pressure effect, the bottom is connected with constant force spring, accept the elastic force effect of constant force spring, communicate, accept the suction pressure effect with air outlet hole, be this three's the motion state of making a concerted effort to determine by-pass cock, thereby change the size of air jet and combustion gas metering-orifice breathing area; Constant force spring is installed in the mixing body of by-pass cock bottom, provides the control reference force to by-pass cock, full admission pressure, the maximum cylinder compressive force of this control reference force decision motor, thereby the allowable compression ratio of decision motor; The structure of air jet is a toroidal, its ventilation sectional area moves down with by-pass cock and linear the increase, the structure of combustion gas metering-orifice is a non-linear shape, its ventilation sectional area moves down with by-pass cock and non-linear increase, the result that this nonlinear change produces changes the sectional area ratio of air jet and combustion gas metering-orifice, mixture strength changes thereupon, the variation characteristic of this mixture strength is corresponding with the needed reasonable mixture strength of the various operating modes of motor, makes the mixture strength of the comprehensive operating mode of motor all reach reasonable value.

Because mixer and closure are series relationship, the cylinder suction pressure equals atmospheric pressure and deducts the constant voltage pressure drop of mixer and the choked flow pressure drop of closure, because the constant voltage pressure drop of mixer is invariable, the suction pressure of motor changes with the choked flow change in pressure drop of closure, air input of engine by air is controlled by closure, when the choked flow pressure drop of closure is zero, closure is to the effect out of hand of the air inflow of motor, the suction pressure of motor equals the constant voltage pressure drop that atmospheric pressure deducts mixer, the cylinder air inflow is controlled by mixer fully, the mixed device of engine charge pressure is controlled in a certain numerical value, the maximum cylinder compressive force that this full admission pressure produces guarantees that motor does not produce phenomenon of detonation in the scope that fuel antiknock ability allows; Change constant force spring elastic force, just can change cylinder full admission amount, change the cylinder maximum compression, satisfy fuel antiknock Capability Requirement; So, no matter it is how high that engine compression ratio has, by changing the elastic force of constant force spring, can both be controlled at the cylinder maximum compression in the scope that fuel antiknock ability allows, therefore the allowable compression ratio that improves motor under the constant prerequisite of fuel antiknock ability is achieved.

Because limiting engine cylinder full admission amount required in this invention could improve the allowable compression ratio of motor, so, it is also causing the motor max. output torque obviously to descend in the grand low oil consumption significantly, maximum work output takes the lead in improving with the raising of compression ratio, the back descends with the continuation raising of compression ratio, be the reasonable compression ratio of these factor left and right sides motors of the present invention, limit energy-saving application scope of the present invention.

Description of drawings

Fig. 1 is a mixer embodiment's of the present invention cross-sectional view.

Fig. 2 is the shape and structure schematic representation of mixer embodiment combustion gas metering-orifice of the present invention.

Embodiment

See accompanying drawing, the present embodiment mixer by: mix body 2, by-pass cock 4, constant force spring 5 and form; Mixing body 2 and be installed between engine air throttle and the air-strainer, is the carrier and the counterpart of by-pass cock 4 and constant force spring 5, and air jet 3, combustion gas metering-orifice 1, air outlet hole 6 are arranged in it; Air jet 3 is connected with air-strainer, and combustion gas metering-orifice 1 is connected with reduction valve, and air outlet hole 6 is connected with the air inlet road junction of closure; By-pass cock 4 is installed in the mixing body between air jet 3, combustion gas metering-orifice 1, the air outlet hole 6, and air jet 3, combustion gas metering-orifice 1, air outlet hole 6 are separated; By-pass cock 4 tops are mushroom circular bodys, corresponding with air jet 3, cooperate air jet 3 to change the size of air jet ventilation sectional area, communicate with atmosphere through air jet 3, air-strainer above, accept the atmospheric pressure effect, communicate with air outlet hole 6 below, accept the suction pressure effect; By-pass cock 4 bottoms are cylindrical bodys of piston-like, play the guiding role, and are connected with constant force spring 5, accept the elastic force effect of constant force spring 5, and the side cooperates the size that changes combustion gas metering-orifice 1 ventilation sectional area with combustion gas metering-orifice 1; Constant force spring 5 is installed in the mixing body of by-pass cock 4 bottoms, and it mainly acts on is to provide the control reference force to by-pass cock 4, the full admission pressure of this reference force decision motor, cylinder maximum compression, thereby the allowable compression ratio of decision motor; Air jet 3 is toroidals, its ventilation sectional area moves down with by-pass cock 4 and produces linear the increase, the structure of combustion gas metering-orifice 1 is a non-linear shape, its ventilation sectional area moves down with by-pass cock 4 and non-linear increase, this nonlinear change makes by-pass cock 4 be in diverse location, the ratio of air jet and combustion gas metering-orifice is just inequality, the ratio of these two metering-orifice sectional areas constantly changes with the motion of by-pass cock 4, mixture strength also constantly changes thereupon, the combustion gas metering-orifice 1 of shape reasonable in design, make the variation of this mixture strength corresponding, just can make the mixture strength of the comprehensive operating mode of motor all reach reasonable value with the required mixture strength of the various operating modes of motor.

The control power of present embodiment is poor from the suction pressure of the atmospheric pressure of by-pass cock 4 top item faces and bottom surface, and the control power that this pressure difference produces acts directly on the by-pass cock 4, and the size of control power is with the engine charge change in pressure.

When static, by-pass cock 4 is in upper dead center position under the effect of constant force spring 5 elastic force, and air jet 3, combustion gas metering-orifice 1 are in closed condition.

During engine start, the air-intake negative-pressure that is transmitted by closure is delivered to the bottom surface on by-pass cock 4 tops by air outlet hole 6, produce pressure difference between by-pass cock 4 top item faces and the bottom surface, when the pressure of this pressure difference generation surpasses the elastic force of constant force spring 5, by-pass cock 4 moves downward, open air jet 3 and combustion gas metering-orifice 1 synchronously, supply with mixed gas to motor; Because the precondition that the combustion gas metering-orifice is opened is " possessing enough degree of vacuum earlier ", so state of starting operating does not exist the venturi type mixer not have the technical problem of the combustible gas in enough degree of vacuum sucking-off combustion gas metering-orifices, because the style characteristic of combustion gas metering-orifice, move down initially at by-pass cock 4, the ratio of air jet sectional area and combustion gas metering-orifice sectional area is less, mixture strength is just denseer, satisfies the mixture strength requirement of engine start operating mode; Along with opening of closure is big, engine speed constantly raises, air consumption constantly increases, by-pass cock 4 also constantly moves down increasing metering-orifice breathing area in order to adapt to the air quantity needs, the ratio of air jet area and gas quantity hole area also along with regulate to close 4 to move down continuous change big, mixture strength is constantly thinning, when motor is in the medium rotating speed of operating mode commonly used, the ratio of air jet ventilation sectional area and combustion gas metering-orifice ventilation sectional area reaches maximum, it is the rarest that mixture strength reaches, and mixture strength at this moment is economic mixed gas; Motor by middling speed when high speed changes, the ratio of air jet sectional area and combustion gas metering-orifice sectional area again from large to small, mixed gas is thickened by rare, satisfies the high-power needs of high engine speeds, the comprehensive operating mode mixture strength of motor all reaches reasonable value.

Engine idling condition, low negative operating mode, in during negative operating mode, cylinder intake pressure equals atmospheric pressure and deducts the constant voltage pressure drop on by-pass cock 4 tops and the choked flow step-down of solar term, the cylinder compressive force that cylinder intake air quantity produces does not reach the limiting value that fuel antiknock ability allows, motor can not produce phenomenon of detonation, the cylinder intake air quantity of motor is controlled by closure, and the cylinder compressive force of motor changes with throttle opening and engine speed change; When motor is completely born operating mode, closure is to the effect out of hand of the cylinder intake air quantity of motor, the choked flow pressure drop of closure disappears, the cylinder suction pressure equals the constant voltage pressure drop that atmospheric pressure deducts mixer, the cylinder maximum compression is controlled by mixer, regulate by constant force spring 5, this cylinder maximum compression can only be near the limiting value of fuel antiknock ability permission, guarantee completely negative operating mode motor normal combustion still, can not produce phenomenon of detonation, as seen, cylinder maximum compression of the present invention is not to be determined by engine compression ratio, but by mixer decision, the cylinder maximum compression is not that the raising with engine compression ratio improves, but reducing and improve with constant force spring 5 elastic force, cylinder maximum compression and compression ratio have broken away from traditional proportional relation, accomplished the raising engine compression ratio, do not improved the cylinder maximum compression, the allowable compression ratio that improves motor under the constant prerequisite of fuel antiknock ability is achieved.

Specific embodiment

1, be used for CNG/ EFI fuel oil variable fuel vehicle, motor adopts the compression ratio of 12.5:1, during combustion gas, reduces constant force spring 5 elastic force as far as possible, strengthens the maximum cylinder intake air quantity of motor, improves gas power, and the mixer list plays mixed function; During fuel oil, strengthen constant force spring 5 elastic force, the maximum cylinder intake air quantity of control motor makes the cylinder maximum compression meet Fuel Petroleum antiknock Capability Requirement, avoids motor generation phenomenon of detonation, and the mixer list plays the effect of air inlet constant voltage.

2, be used for the LPG mono fuel vehicle; (1) preferentially examine the filter power character, adopt the compression ratio of 10:1, reduce constant force spring 5 elastic force as far as possible, the mixer list plays air, combustion gas mixing effect; (2) preferentially examine the filter fuel economy, adopt the compression ratio of 15:1, strengthen constant force spring elastic force, control cylinder full admission amount, make the cylinder maximum compression satisfy LPG fuel antiknock Capability Requirement, avoid motor generation phenomenon of detonation, mixer plays air inlet constant voltage, mixed function.

Claims

1, a kind of vacuum contant pressure mixer that is used for explosive motor is characterized in that being made up of mixing body, by-pass cock, constant force spring; Mixing in the body has air jet, combustion gas metering-orifice and air outlet hole, and air jet is connected with air-strainer, and the combustion gas metering-orifice is connected with reduction valve, and air outlet hole is connected with the air inlet road junction of closure; By-pass cock top is mushroom circular body, the bottom is the circular body of piston-like, be installed in the mixing body between air jet, combustion gas metering-orifice, the air outlet hole, upper top is corresponding with air jet, the bottom surface communicates with air outlet hole, the side, middle part cooperates with the combustion gas metering-orifice, the bottom connects constant force spring, can to-and-fro motion in mixing body; Constant force spring is installed in the mixing body of by-pass cock bottom, and the lower end is sat the end of with and is connected, and the upper end is connected with by-pass cock.