CN210422761U

CN210422761U - Engine with supercharging system

Info

Publication number: CN210422761U
Application number: CN201920932165.0U
Authority: CN
Inventors: 张斌; 钟德妹; 李国卿; 陈永燕; 陈翔
Original assignee: Chongqing Longxin Tonghang Engine Manufacturing Co ltd
Current assignee: Chongqing Longxin Tonghang Engine Manufacturing Co ltd
Priority date: 2019-06-20
Filing date: 2019-06-20
Publication date: 2020-04-28
Anticipated expiration: 2029-06-20

Abstract

The utility model discloses an engine with a supercharging system, which comprises an engine body, an air inlet system, an exhaust system and a supercharging system, wherein the exhaust system comprises an exhaust pipeline communicated between an exhaust port of the engine and a silencer, the exhaust pipeline is provided with an exhaust resonant cavity, and the exhaust resonant cavity is positioned between the exhaust port of the engine and the supercharging system; the utility model discloses a set up the exhaust resonant cavity on exhaust duct, can effectively reduce the volatility that the carminative frequency characteristic that is used for driving turbine subassembly leads to, avoid because the problem that the pressure boost effect that the negative work reason of pump gas leads to can't embody, improve engine power, and simple structure, reduce engine energy consumption and emission to can not increase the cost of turbocharging system.

Description

Engine with supercharging system

Technical Field

The utility model relates to an engine field, concretely relates to utilize turbocharging system to improve engine of power.

Background

The main function of turbocharging is to increase the air intake of the engine, thereby increasing the power and torque of the engine. In the prior art, a turbocharging system mainly comprises a supercharging device, an intercooler and other equipment, wherein the supercharging device comprises a turbine assembly arranged in an exhaust system and a supercharger (air compressor assembly) arranged in an air intake system, and the turbine assembly is driven by exhaust pressure to drive the supercharger to increase the air intake pressure, so that the power of an engine is improved.

In the prior art, the engine exhaust has a certain frequency, so the driving of the driven turbine assembly has fluctuation. The fluctuation is particularly serious for a single-cylinder engine, the traditional exhaust structure can cause very large negative work of pumping so that the supercharging effect cannot be embodied, and meanwhile, the working stability of the supercharger can be influenced. Therefore, the traditional supercharging system structure is difficult to avoid the problems, so that the advantages of the supercharging structure cannot be fully embodied, and particularly, the effect of the supercharging system cannot be fully embodied in a single-cylinder engine.

Therefore, the supercharging system in the prior art needs to be improved, the fluctuation caused by the frequency characteristic of exhaust gas can be effectively reduced, the problem that the supercharging effect cannot be embodied due to negative work of pump air is avoided, the power of the engine is improved, the structure is simple, the energy consumption of the engine is reduced, and the cost of the supercharging system is not increased.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model aims at providing an engine with turbocharging system can effectively reduce because the volatility that carminative frequency characteristic leads to, avoids the problem that the pressure boost effect that leads to because the negative work reason of pump gas can't embody, improves engine power, and simple structure, reduces the engine energy consumption to can not increase turbocharging system's cost.

The utility model discloses an engine with supercharging system, including engine body, air intake system, exhaust system and supercharging system, exhaust system includes the exhaust duct who communicates between engine gas vent and silencer, exhaust duct is equipped with the exhaust resonant cavity, the exhaust resonant cavity is located between engine gas vent and supercharging system; for an engine, an air inlet system comprises components such as an air filter and an air inlet pipeline, an exhaust system comprises components such as an exhaust pipeline and a silencer, and an engine body further comprises some necessary components, which belong to the prior art and are not described again; the supercharging system comprises a turbine component driven by the exhaust system, a supercharging component (compressor) driven by the turbine component, an intercooler and other components, belongs to the prior art, and is not described again; the utility model discloses set up the exhaust resonant cavity before turbine assembly, utilize the buffering resonance effect of exhaust resonant cavity, reduce because the fluctuation that exhaust frequency arouses, of course, still can set up the part of some resonance baffles and so on in the resonant cavity.

Furthermore, the exhaust pipeline is provided with a bypass, the bypass is communicated between the front exhaust pipe section of the supercharging system and the rear exhaust pipe section of the supercharging system, and the bypass is provided with a control valve for controlling the opening and closing of the bypass and the opening degree of the bypass; because the effect of exhaust pressure, when the great pressure of exhaust, turbine assembly drive pressure boost subassembly can be great increase intake pressure, and too big intake pressure can lead to whole intake uneven, consequently, utilize opening and close and the aperture of control valve control bypass for some waste gas is direct to be discharged through the bypass and not pass through turbine assembly, and simultaneously, this bypass combines the fluctuation that the exhaust resonant cavity can also effectively reduce the gas that gets into turbine assembly.

Further, the opening and closing and the opening and closing degree of the control valve are controlled in an interlocking mode through the air inlet pressure of the engine; the exhaust gas entering the turbine assembly is controlled in an interlocking mode through the intake pressure, the rotating speed of the turbine assembly is directly adjusted so as to control the intake pressure, and the direct adjusting effect is achieved; the method and the structure of the interlocking control are various, the pressure sensor can be used for detecting the air inlet pressure and controlling the opening and closing of the valve through electric control, and a pneumatic structure can be used for controlling, which belong to the existing control technology and are not described again; the source of the air inlet pressure controlled in an interlocking way can be behind the supercharger or in front of the supercharger, preferably behind the supercharger, and because the air inlet pressure in a pipeline behind the supercharger is the pressure behind the supercharger and the air inlet pressure in the pipeline behind the supercharger has timeliness, the pressure is obviously improved and has obvious fluctuation, and the control of the air inlet pressure is facilitated.

Further, the air inlet system comprises an air inlet pipeline, the air inlet pipeline is provided with an air inlet resonant cavity, and the air inlet resonant cavity is positioned between the supercharging system and an air inlet of the engine; as shown in the figure, the air inlet resonant cavity is arranged between the intercooler and the supercharger and is combined with the air exhaust resonant cavity, and the frequency characteristic of air inlet is eliminated from the source and the output together, so that the stable operation of the engine is kept.

Further, the air inlet pipeline is communicated with a pressure control branch line, and the pressure control branch line is connected with the control valve and used for conveying air inlet pressure to the control valve to control the opening and closing of the control valve and the opening and closing degree of the control valve; in the structure, the pressure control branch line is used for leading out the air inlet channel and is connected to the control port of the pneumatic control valve, so that the structure has the characteristic of directness, and the air inlet pressure and the supercharging component are rapidly controlled; the control valve is a pneumatic spring control valve, the opening and closing of the control valve are controlled by utilizing the air inlet pressure, and the action principle and the control method of the pneumatic spring control valve belong to the prior art and are not described again; compared with an electric control valve, the electric control valve has the characteristics of simple structure, low failure rate and low cost.

Further, the engine is a single cylinder engine; the volume of exhaust resonant cavity is 1.5-9 times of engine displacement, and this volume scope's exhaust resonant cavity has the characteristic of better elimination volatility, as shown in the figure, to single cylinder engine, can improve engine power greatly, promptly the utility model discloses be particularly suitable for single cylinder engine to use.

Furthermore, the volume of the air inlet resonant cavity is 1.5 times larger than the displacement of the engine, and the air inlet resonant cavity with the volume is combined with the exhaust resonant cavity, so that the near-term stability is greatly increased, and the superimposed engine power improvement effect is achieved.

Furthermore, the volume of the air inlet resonant cavity is 1.5 times of the engine displacement, the volume of the exhaust resonant cavity is 6 times of the engine displacement, and the volumes of the air inlet resonant cavity and the exhaust resonant cavity are optimized, so that the power of the engine can be greatly increased, the effect of turbocharging is achieved, and particularly for a single-cylinder engine, the efficiency of the engine is improved while the stability of air inlet is ensured; as shown, engine power is highest with some reduction above and below preferred power at preferred intake and exhaust resonator volume conditions.

Further, the length of a pipe section of the exhaust pipeline, which is positioned between the exhaust port of the engine and the exhaust resonant cavity, is 100mm and 400 mm; this length scope combines the volume parameter of exhaust resonant cavity, does benefit to and forms resonance and buffering to do benefit to the exhaust stationarity who guarantees to get into turbine assembly, combine the setting of bypass, more can guarantee carminative steady, thereby make the steady operation of turbocharging system, realize the effective control to near term.

Furthermore, the pressure control branch line is communicated with a rear pipe section of a supercharging system of the air inlet pipeline, and the pressure of air inlet of the engine can be directly reflected, so that effective control is realized, stable operation of the engine is guaranteed, power and combustion efficiency are improved, emission of the engine is finally guaranteed, and energy consumption is reduced.

The beneficial effects of utility model are that: the utility model discloses an engine with turbocharging system through set up the exhaust resonant cavity on exhaust duct, can effectively reduce the volatility that is used for driving turbine subassembly because carminative frequency characteristic leads to, avoids the problem that the pressure boost effect that leads to because pump gas negative work reason can't embody, improves engine power, and simple structure, reduces engine energy consumption and emission to can not increase turbocharging system's cost.

Drawings

The invention will be further described with reference to the following figures and examples:

FIG. 1 is a schematic view of the structure principle of the present invention;

FIG. 2 is a graph of the effect on engine power (different volumes) of access to only the intake resonator;

FIG. 3 is a graph of the effect on engine power (different volumes) of access to only the exhaust cavity;

FIG. 4 is a graph of the effect of the length of the exhaust pipe section between the exhaust port of the engine and the exhaust resonator on engine power;

FIG. 5 is a graph illustrating the effect of an improved intake and exhaust system on engine power.

Detailed Description

As shown in the figures, the engine of the present invention comprises an engine body 1, an air intake system, an exhaust system and a supercharging system, wherein the exhaust system comprises an exhaust pipeline 3 communicated between an exhaust port of the engine and a muffler, the exhaust pipeline 3 is provided with an exhaust resonant cavity 2, and the exhaust resonant cavity 2 is located between the exhaust port of the engine and the supercharging system; for the engine, the air intake system includes components such as an air filter 8, an air intake duct 9, etc., the exhaust system includes components such as an exhaust duct 3 and a muffler 7, etc., and the engine body 1 further includes some necessary components such as a cylinder block, a piston assembly, a connecting rod crankshaft, etc., which belong to the prior art and are not described herein again; the supercharging system comprises a turbine assembly 14 driven by the exhaust system, a supercharging assembly (compressor) 12 driven by the turbine assembly, an intercooler 11 and other assemblies, belongs to the prior art, and is not described herein again; the utility model arranges the exhaust resonant cavity 2 in front of the turbine component 14, and reduces the fluctuation caused by the exhaust frequency by using the buffer resonance effect of the exhaust resonant cavity 2, and certainly, the resonant cavity can be also provided with some parts such as resonance baffle plates; as shown in the figure, the exhaust resonant cavity is communicated with the exhaust pipeline, that is, the air inlet of the exhaust resonant cavity 14 is communicated with the exhaust port of the engine, and the air outlet is communicated with the air inlet of the turbine assembly, which is not described herein again.

In this embodiment, the exhaust pipeline 3 is provided with a bypass 5, the bypass 5 is communicated between a front exhaust pipe section of the supercharging system and a rear exhaust pipe section of the supercharging system, and the front refers to the direction of air intake of the turbine assembly 14, namely the direction of an exhaust port of the engine; the bypass 5 is provided with a control valve 4 for controlling the opening and closing of the bypass and the opening degree of the bypass; because the effect of exhaust pressure, when the great pressure of exhaust, turbine assembly drive pressure boost subassembly can be great increase intake pressure, and too big intake pressure can lead to whole intake uneven, consequently, utilize opening and close and the aperture of control valve control bypass for some waste gas is direct to be discharged through the bypass and not pass through turbine assembly 14, and simultaneously, this bypass 5 combines exhaust cavity 2 can also effectively reduce the volatility of the gas that gets into turbine assembly.

In the embodiment, the opening and closing and the opening and closing degree of the control valve 4 are controlled in an interlocking manner through the intake pressure of the engine; the exhaust gas entering the turbine assembly 14 is controlled in an interlocking mode through the intake pressure, the rotating speed of the turbine assembly is directly adjusted, so that the intake pressure is controlled, and the direct adjusting effect is achieved; the method and the structure of the interlocking control are various, the pressure sensor can be used for detecting the air inlet pressure and controlling the opening and closing of the valve through electric control, and a pneumatic structure can be used for controlling, which belong to the existing control technology and are not described again; the source of the air inlet pressure controlled in an interlocking way can be behind the supercharger or in front of the supercharger, preferably behind the supercharger, and because the air inlet pressure in a pipeline behind the supercharger is the pressure behind the supercharger and the air inlet pressure in the pipeline behind the supercharger has timeliness, the pressure is obviously improved and has obvious fluctuation, and the control of the air inlet pressure is facilitated.

In this embodiment, the air intake system includes an air intake duct 9, the air intake duct 9 is provided with an air intake resonant cavity 10, and the air intake resonant cavity 10 is located between the supercharging system and the engine air intake; as shown in the figure, the air intake resonant cavity is installed between the intercooler 11 and the supercharger 12, and as shown in the figure, the air intake resonant cavity 10 is communicated with the air intake pipeline, that is, the air inlet of the air intake resonant cavity 10 is communicated with the air outlet of the supercharger, and the air outlet is communicated with the air inlet of the intercooler, which is not described herein again; the intake resonator 10 in combination with the exhaust resonator 14 eliminates the intake air flutter characteristics both from the source and from the output, thereby facilitating the maintenance of stable engine operation.

In this embodiment, the air inlet pipeline 9 is provided with a pressure control branch line 6 in a communicating manner, and the pressure control branch line 6 is connected with the control valve 4 and used for conveying air inlet pressure to the control valve for controlling the opening and closing and the opening and closing degree of the control valve; in the structure, the pressure control branch line 6 is used for leading out the air inlet pressure of the air inlet channel and is connected to the control port of the pneumatic control valve, and the opening and closing of the pneumatic control valve are controlled through the air inlet pressure, so that the structure has the characteristic of directness, the power output of the supercharging component is rapidly controlled by using the air inlet pressure, the air inlet pressure is finally controlled, and the closed loop of air inlet pressure control is realized; the control valve is a pneumatic spring control valve, the opening and closing of the control valve are controlled by utilizing the air inlet pressure, the action principle of the pneumatic spring control valve is that air is introduced by utilizing a pressure control branch line 6, the air enters the air inlet end of the pneumatic spring control valve directly, after the set pressure is reached, the spring of the pneumatic spring control valve is compressed, a valve core is opened, a bypass is opened, an exhaust part is directly discharged through the bypass, the driving to a turbine is reduced, and the principle and the control method of the pneumatic spring control valve belong to the prior art and are not described again; compared with an electric control valve, the electric control valve has the characteristics of simple structure, low failure rate and low cost.

In the embodiment, the engine is a single-cylinder engine; the volume of exhaust resonant cavity 2 is 1.5-9 times of engine displacement, and the exhaust resonant cavity of this volume scope has the characteristic of better elimination volatility, as shown in the figure, to single cylinder engine, can improve engine power greatly, promptly the utility model discloses be particularly suitable for single cylinder engine to use.

In this embodiment, the volume of the intake resonant cavity 10 is greater than 1.5 times of the engine displacement, and the intake resonant cavity 10 with the volume is combined with the exhaust resonant cavity, so that the recent stability is greatly increased, and the superimposed engine power improvement effect is achieved.

In the embodiment, the volume of the air inlet resonant cavity 10 is 1.5 times of the engine displacement, the volume of the exhaust resonant cavity 2 is 6 times of the engine displacement, and the preferred volumes of the air inlet resonant cavity and the exhaust resonant cavity can greatly increase the engine power, have the effect of turbocharging, and particularly improve the engine efficiency while ensuring the stability of air inlet for a single-cylinder engine; as shown, engine power is highest with some reduction above and below preferred power at preferred intake and exhaust resonator volume conditions.

In this embodiment, the length of the pipe section 13 of the exhaust pipe 3 between the exhaust port of the engine and the exhaust resonant cavity is 100-400 mm; preferably 300mm, this length range combines the volume parameter of exhaust resonant cavity, does benefit to and forms resonance and buffering to do benefit to the exhaust stationarity of guaranteeing to get into turbine assembly, combine the setting of bypass, more can guarantee carminative steady, thereby make supercharging system even running, realize the effective control to near term.

As shown in the figure, the single-cylinder engine with the engine displacement of 650ml for the test in the embodiment, that is, 0.65L, is connected to the 1L intake resonant cavity, so that the power of the engine can be effectively increased, the volume of the resonant cavity is continuously increased, and the power of the engine is in a downward trend on the contrary, as shown in fig. 2, the 0.5L, 1L, 1.5L and 2L intake resonant cavities are used for comparison, the relative effect of the 1L intake resonant cavity is the best, and the ratio at this time is about 1.5 times;

the exhaust system is directly provided with a turbocharging system, and the supercharging effect cannot be achieved. The exhaust resonant cavity with a certain volume is introduced in front of the turbocharging system, so that the power of the engine can be greatly improved, but the volume is continuously increased after the volume reaches 4L, the further improvement amplitude of the power of the engine is not obvious, the altitude of 4000m and the pressure ratio of 2.1 are lower, and the power of the engine is improved by 78 percent compared with that of the original engine by the resonant cavity with the volume of 4L; as shown in fig. 3, 1L, 2L, 4L and 6L exhaust resonators are used for comparison, although the power of the 6L exhaust resonator is increased to a certain extent compared with the 4L exhaust resonator, the increase amplitude is small, the volume is large, the comprehensive cost performance is better when the 4L exhaust resonator is used, and meanwhile, the 4L exhaust resonator is about 6 times of the displacement of the 0.65L engine;

the length of the exhaust pipe connecting the exhaust port and the resonant cavity is in the range of 100mm-400mm, the power is gradually increased along with the increase of the length of the exhaust pipe, when the length of the exhaust pipe is increased to 400mm, the power of the engine has a descending trend along with the increase, as shown in figure 4, the length of the exhaust pipe is 100, 200, 300 and 400mm, the efficiency of 300mm is the highest, when 400mm is received, the power is reduced to be slightly higher than 100mm, and therefore, the length is preferably 300 mm.

After a 1L air inlet resonant cavity and a 4L air outlet resonant cavity are connected, and an exhaust pipe with the length of 300mm is connected between an exhaust port and the air outlet resonant cavity, the power of the engine is increased by 85% compared with that of the original engine under the altitude of 4000m and the pressure of 2.1, and the engine is shown in figure 5.

In fig. 2-5, the abscissa is the pressure increase ratio and the ordinate is the power.

In this embodiment, the pressure control branch line 6 is communicated with a rear pipe section of a supercharging system (supercharger 12) of the air inlet pipeline 9, and can directly reflect the air inlet pressure of the engine, so that effective control is realized, stable operation of the engine is ensured, power and combustion efficiency are improved, emission of the engine is finally ensured, and energy consumption is reduced.

In the utility model, the communication between the exhaust resonant cavity and the intake resonant cavity and the exhaust pipeline and the intake pipeline can be realized by the existing mechanical connection methods, such as welding, detachable connection and the like, which are not described herein again; the supercharging system comprises a turbine component, a supercharging component and a intercooler, and the connection and matching relationship with the air inlet and exhaust system also belongs to the prior art, and is not described in detail herein.

Finally, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the present invention can be modified or replaced by other means without departing from the spirit and scope of the present invention, which should be construed as limited only by the appended claims.

Claims

1. An engine with a supercharging system, characterized in that: the exhaust system comprises an exhaust pipeline communicated between an exhaust port of the engine and the muffler, the exhaust pipeline is provided with an exhaust resonant cavity, and the exhaust resonant cavity is positioned between the exhaust port of the engine and the supercharging system.

2. The engine with a supercharging system according to claim 1, characterized in that: the exhaust pipeline is provided with a bypass, the bypass is communicated between the front exhaust pipe section of the pressurization system and the rear exhaust pipe section of the pressurization system, and the bypass is provided with a control valve for controlling the opening and closing of the bypass and the opening degree of the bypass.

3. The engine with a supercharging system according to claim 2, characterized in that: the opening and closing and the opening and closing degree of the control valve are controlled in an interlocking mode through the air inlet pressure of the engine.

4. The engine with a supercharging system according to claim 1, characterized in that: the air inlet system comprises an air inlet pipeline, the air inlet pipeline is provided with an air inlet resonant cavity, and the air inlet resonant cavity is located between the supercharging system and an air inlet of the engine.

5. The engine with a supercharging system according to claim 4, characterized in that: the air inlet pipeline is communicated with a pressure control branch line, and the pressure control branch line is connected with the control valve and is used for conveying air inlet pressure to the control valve to control the opening and closing of the control valve and the opening and closing degree of the control valve.

6. The engine with a supercharging system according to claim 4, characterized in that: the engine is a single cylinder engine; the volume of the exhaust resonant cavity is 1.5-9 times of the displacement of the engine.

7. The engine with a supercharging system according to claim 6, characterized in that: the volume of the air inlet resonant cavity is 1.5 times larger than the displacement of the engine.

8. The engine with a supercharging system according to claim 7, characterized in that: the volume of the air inlet resonant cavity is 1.5 times of the displacement of the engine, and the volume of the air outlet resonant cavity is 6 times of the displacement of the engine.

9. The engine with a supercharging system according to claim 8, characterized in that: the length of a pipe section of the exhaust pipeline between the exhaust port of the engine and the exhaust resonant cavity is 100-400 mm.

10. The engine with a supercharging system according to claim 5, characterized in that: the pressure control branch line is communicated with the rear pipe section of the pressurization system of the air inlet pipeline.