CN103195615A - Differential pressure type mechanical adjusting system - Google Patents

Abstract

A differential pressure mechanical adjustment system in the technical field of mechanical design, comprising: an intake pipe, an engine, an exhaust pipe, a compressor, a turbine, a connecting pipe, a volume chamber, a moving body and a spring, and the connecting pipe communicates with the wall of the volume chamber, The moving body is installed in the volume chamber and is in sealing contact with the inner wall of the volume chamber, the through pipe runs through the left and right walls of the moving body, and the two ends of the spring are respectively connected with the upper wall of the moving body and the upper wall of the volume chamber. When the engine is in the medium-low speed condition, the moving body moves upward in the volume cavity, the exhaust gas recirculation rate is high, the exhaust temperature of each cylinder of the engine is low, and the performance of the whole machine is better; when the engine is in the high-speed working condition, the moving body The volume cavity moves downward, the exhaust gas recirculation rate is small, the power of the engine is better, and the performance of the whole machine is better. The invention has reasonable design and simple structure, and is suitable for exhaust gas recirculation systems with turbochargers.

Description

Differential pressure mechanical adjustment system

technical field

The invention relates to an exhaust gas recirculation system in the field of mechanical design, in particular to a differential pressure mechanical adjustment system with a turbocharger.

Background technique

Harmful emissions from engines are a major source of air pollution. With the increasing importance of environmental protection, the goal of reducing harmful emissions from engines has become an important direction for engine development in the world today. With the world's consumption of petroleum products increasing year by year, international oil prices remain high, and the economy of diesel vehicles is becoming more and more prominent, which makes diesel engines occupy an increasingly important position in vehicle power. Therefore, it is the primary task of diesel engine designers to carry out research on the control methods of harmful emissions from diesel engines. Exhaust gas recirculation system is to send a small part of the exhaust gas produced by the diesel engine back to the cylinder. The recirculated exhaust gas will retard the combustion process due to its inertness, that is to say the combustion rate will slow down and cause the pressure build-up process in the combustion chamber to slow down, which is the main reason for the reduction of nitrogen oxides. In addition, increasing the exhaust gas recirculation rate will reduce the total exhaust flow, so the total pollutant output in exhaust emissions will be relatively reduced. In medium and low speed conditions, the engine needs a larger exhaust gas recirculation rate to reduce exhaust temperature and reduce pollution; in high speed conditions, the engine needs a smaller exhaust gas recirculation rate to improve the power of the engine.

After searching the existing technical literature, it is found that Chinese patent number ZL200410063439.5, patent name: electronic exhaust gas recirculation gas control device, this patent technology provides a device for controlling the exhaust gas recirculation rate of the engine, which can better Taking into account the medium and high speed conditions of the engine; but the change of the exhaust gas recirculation rate is realized through a special control structure, which makes the control system more complicated.

Contents of the invention

The present invention aims at the deficiencies of the above-mentioned prior art, and provides a differential pressure mechanical adjustment system, so that the exhaust gas recirculation rate can be self-adjusted, better taking into account the various speed conditions of the engine, and the structure is simple, no special control mechanism.

The present invention is achieved through the following technical solutions, the present invention comprises: compressor intake pipe, compressor, engine intake pipe, engine, engine exhaust pipe, turbine, turbine exhaust pipe, connecting shaft, volume chamber, volume chamber wall, the lower wall of the volume cavity, the left wall of the volume cavity, the right wall of the volume cavity, the front wall of the volume cavity, the rear wall of the volume cavity, the moving body, the spring, the first connecting pipe, the second connecting pipe, the third connecting pipe, the through pipe and The fourth connecting pipe, the air inlet and outlet of the compressor are respectively connected with the air outlet of the compressor inlet pipe and the air inlet of the engine inlet pipe, and the air inlet and outlet of the engine are respectively connected with the air outlet of the engine inlet pipe and the air inlet of the engine exhaust pipe. The air inlet and outlet of the turbine are respectively connected with the air outlet of the engine exhaust pipe and the air inlet of the turbine exhaust pipe. The compressor is connected with the turbine through a connecting shaft. The cross section of the volume chamber is rectangular. The wall surface, the lower wall surface of the volume cavity, the left wall surface of the volume cavity, the right wall surface of the volume cavity, the front wall surface of the volume cavity, and the rear wall surface of the volume cavity are consolidated into one body. One end is connected, the other end of the fourth connecting pipe is connected with the compressor intake pipe, the two ends of the second connecting pipe are respectively connected with the engine exhaust pipe and the right wall of the volume chamber, and the two ends of the third connecting pipe are respectively connected with the engine The air inlet pipe and the upper wall of the volume chamber are connected. The first connecting pipe, the second connecting pipe, and the through pipe are all straight round pipes with the same inner diameter. The axis of the first connecting pipe coincides with the axis of the second connecting pipe. The first connecting pipe The axis of the spring is on the same plane as the axis of the penetrating pipe. The moving body is installed in the volume chamber and is in sealing contact with the inner wall of the volume chamber. The penetrating pipe runs through the left and right walls of the moving body. The upper walls of the volume chambers are connected.

During the working process of the present invention, the mobile body can move up and down in the volume cavity. When the engine is in the medium-low speed condition, the pressure in the engine intake pipe is low, and the pressure in the volume cavity above the moving body is also low. Under the tension of the spring, the moving body moves upward, so that the first connecting pipe passes through the through pipe Connected with the second connecting pipe, the exhaust gas recirculation rate increases, the exhaust temperature of each cylinder of the engine decreases, and the performance of the whole machine is better; when the engine is at high speed, the pressure in the engine intake pipe is high, and the volume above the moving body The pressure in the cavity is also high, and the moving body moves downward after overcoming the elastic force of the spring and stretches the spring, so that the first connecting pipe is separated from the second connecting pipe, the exhaust gas recirculation rate is reduced, and the engine power is better , the overall performance is better.

Compared with the prior art, the present invention has the following beneficial effects: the present invention is reasonable in design and simple in structure, and is suitable for exhaust gas recirculation systems with turbochargers. The recirculation system does not require a dedicated exhaust gas recirculation rate control mechanism.

Description of drawings

Fig. 1 is the structural representation of differential pressure type mechanical adjustment system of the present invention;

Fig. 2 is the structural representation of A-A section among Fig. 1;

Among them: 1. Compressor intake pipe, 2. Compressor, 3. Engine intake pipe, 4. Engine, 5. Engine exhaust pipe, 6. Turbine, 7. Turbine exhaust pipe, 8. Connecting shaft, 9. Volume Cavity, 10, the upper wall of the volume cavity, 11, the lower wall of the volume cavity, 12, the left wall of the volume cavity, 13, the right wall of the volume cavity, 14, the front wall of the volume cavity, 15, the rear wall of the volume cavity, 16, the moving body, 17 , spring, 18, first connecting pipe, 19, second connecting pipe, 20, third connecting pipe, 21, through pipe, 22, fourth connecting pipe.

Detailed ways

The embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. This embodiment is based on the technical solution of the present invention, and provides detailed implementation methods and specific operating procedures, but the scope of protection of the present invention is not limited to the following embodiments. .

Example

As shown in Fig. 1 and Fig. 2, the present invention comprises: compressor intake pipe 1, compressor 2, engine intake pipe 3, engine 4, engine exhaust pipe 5, turbine 6, turbine exhaust pipe 7, connecting shaft 8, Volume cavity 9, volume cavity upper wall 10, volume cavity lower wall 11, volume cavity left wall 12, volume cavity right wall 13, volume cavity front wall 14, volume cavity rear wall 15, moving body 16, spring 17, first connection Pipe 18, second connecting pipe 19, third connecting pipe 20, through pipe 21 and fourth connecting pipe 22, the air inlet and outlet of compressor 2 are respectively connected with the air outlet of compressor inlet pipe 1 and the air inlet of engine inlet pipe 3 The air inlet and outlet of the engine 4 are connected with the air outlet of the engine intake pipe 3 and the air inlet of the engine exhaust pipe 5 respectively, and the air inlet and outlet of the turbine 6 are respectively connected with the air outlet of the engine exhaust pipe 5 and the turbine exhaust pipe. The air inlet of 7 is connected, the compressor 2 is connected with the turbine 6 through the connecting shaft 8, the cross section of the volume chamber 9 is rectangular, the volume chamber upper wall 10, the volume chamber lower wall 11, the volume chamber left wall 12, the volume chamber The right wall surface 13, the front wall surface 14 of the volume cavity, and the rear wall surface 15 of the volume cavity are consolidated into one body. One end communicates with the compressor inlet pipe 1, and the two ends of the second connecting pipe 19 communicate with the engine exhaust pipe 5 and the right wall surface 13 of the volume chamber respectively, and the two ends of the third connecting pipe 20 are connected with the engine inlet pipe 3 and the volume chamber respectively. The upper wall surface 10 of the cavity is connected, the first connecting pipe 18, the second connecting pipe 19, and the through pipe 21 are all straight round pipes with the same inner diameter, the axis of the first connecting pipe 18 coincides with the axis of the second connecting pipe 19, and the first connecting pipe 18 The axis of the connecting pipe 18 is on the same plane as the axis of the through pipe 21. The moving body 16 is installed in the volume chamber 9 and is in sealing contact with the inner wall of the volume chamber 9. The through pipe 21 runs through the left and right walls of the moving body 16. The spring 17 The two ends are respectively connected with the upper wall surface of the moving body 16 and the upper wall surface 10 of the volume cavity.

During the working process of the present invention, the moving body 16 can move up and down in the volume cavity 9 . When the engine 4 is in a medium-low speed working condition, the pressure in the engine intake pipe 3 is low, and the pressure in the volume cavity above the moving body 16 is also low. Under the stretching effect of the spring 17, the moving body 16 moves upward, so that the first The connecting pipe 18 communicates with the second connecting pipe 19 through the through pipe 21, the exhaust gas recirculation rate increases, the exhaust temperature of each cylinder of the engine 4 decreases, and the overall performance is better; when the engine is in a high-speed working condition, the engine intake pipe 3 The internal pressure is higher, and the pressure in the volume cavity above the moving body 16 is also higher. After the moving body 16 overcomes the elastic force of the spring 17, it moves downward and stretches the spring 17, so that the first connecting pipe 18 and the second connecting pipe 19 phases are separated, the exhaust gas recirculation rate is reduced, the power of the engine 4 is better, and the performance of the whole machine is better. Therefore, the present invention can better take into account various rotational speed conditions of the engine 4 .

Claims (1)

1. A differential pressure mechanical adjustment system, including compressor intake pipe (1), compressor (2), engine intake pipe (3), engine (4), engine exhaust pipe (5), turbine (6) , turbine exhaust pipe (7) and connecting shaft (8), the air inlet and outlet of the compressor (2) are respectively connected with the air outlet of the compressor inlet pipe (1) and the air inlet of the engine inlet pipe (3), and the engine The air inlet and outlet of (4) are respectively connected with the air outlet of the engine intake pipe (3) and the air inlet of the engine exhaust pipe (5), and the air inlet and outlet of the turbine (6) are respectively connected with the outlet of the engine exhaust pipe (5). The air port is connected to the air inlet of the turbine exhaust pipe (7), and the compressor (2) is connected to the turbine (6) through the connecting shaft (8). Wall surface (10), volume cavity lower wall surface (11), volume cavity left wall surface (12), volume cavity right wall surface (13), volume cavity front wall surface (14), volume cavity rear wall surface (15), moving body (16) , spring (17), first connecting pipe (18), second connecting pipe (19), third connecting pipe (20), through pipe (21) and fourth connecting pipe (22), volume chamber (9) The cross section is rectangular, the upper wall of the volume cavity (10), the lower wall of the volume cavity (11), the left wall of the volume cavity (12), the right wall of the volume cavity (13), the front wall of the volume cavity (14), the rear wall of the volume cavity ( 15) Consolidated into one body, the two ends of the first connecting pipe (18) are respectively connected with the left wall of the volume chamber (12) and one end of the fourth connecting pipe (22), and the other end of the fourth connecting pipe (22) is connected with the The compressor inlet pipe (1) is connected, the two ends of the second connecting pipe (19) are respectively connected with the engine exhaust pipe (5) and the right wall of the volume chamber (13), and the two ends of the third connecting pipe (20) They are respectively connected with the engine intake pipe (3) and the upper wall surface of the volume chamber (10). The first connecting pipe (18), the second connecting pipe (19) and the through pipe (21) are all straight round pipes with the same inner diameter. The axis of a connecting pipe (18) coincides with the axis of the second connecting pipe (19), the axis of the first connecting pipe (18) and the axis of the through pipe (21) are on the same plane, and the moving body (16) is installed with a volume chamber (9) and is in sealing contact with the inner wall of the volume cavity (9), the penetrating tube (21) runs through the left and right walls of the moving body (16), and the two ends of the spring (17) are respectively connected to the upper wall of the moving body (16). , and the upper wall (10) of the volume cavity are connected.

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