CN102562281A - Exhaust recirculating system controlled by exhaust pressure - Google Patents

Abstract

An exhaust gas recirculation system controlled by exhaust pressure in the technical field of internal combustion engines, including: an intake pipe, an engine, an exhaust pipe, a compressor, a turbine, a connecting pipe, a volume chamber, a moving body and elastic components, and a third connecting pipe Installed between the exhaust main pipe and the upper wall of the volume cavity, the cross section of the volume cavity is rectangular, the moving body is installed in the volume cavity and is in sealing contact with the inner wall of the volume cavity, and the moving body is connected with the lower wall of the volume cavity through elastic components . When the engine is in the medium speed condition, the moving body moves upward in the volume cavity, the exhaust gas recirculation rate is higher, the exhaust temperature is lower, and the engine performance is better; when the engine is in the high speed condition, the moving body moves in the volume The cavity moves downward, the exhaust gas recirculation rate is small, the power of the engine is better, and the overall performance of the engine is better. The invention has reasonable design and simple structure, and is suitable for an exhaust gas recirculation system with a turbocharger.

Description

Exhaust gas recirculation system controlled by exhaust pressure

technical field

The invention relates to an exhaust gas recirculation system in the field of internal combustion engines, in particular to an exhaust gas recirculation system controlled by exhaust pressure 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. Under medium speed conditions, the engine needs a larger exhaust gas recirculation rate to reduce exhaust temperature and reduce pollution; under high speed conditions, the engine needs a smaller exhaust gas recirculation rate to improve engine power .

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 However, 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 an exhaust gas recirculation system controlled by exhaust pressure, so that the exhaust gas recirculation rate can be self-adjusted, and the medium and high speed conditions of the engine can be well taken into account, and the structure Simple and does not require a special control mechanism.

The present invention is achieved through the following technical solutions, the present invention comprises: intake pipe, compressor, connecting shaft, compressor outlet pipe, intercooler, intake manifold, engine, exhaust manifold, turbine, exhaust pipe, the first A connecting pipe, a second connecting pipe, a volume cavity, an upper wall of the volume cavity, a lower wall of the volume cavity, a left wall of the volume cavity, a right wall of the volume cavity, a front wall of the volume cavity, a rear wall of the volume cavity, an elastic component, a moving body and a third Connecting pipe, the air outlet of the intake pipe is connected to the air inlet of the compressor, the air outlet of the compressor is connected to the air inlet of the compressor outlet pipe, and the air outlet of the compressor outlet pipe is connected to the air inlet of the intercooler The outlet of the intercooler is connected with the inlet of the intake manifold, the outlet of the intake manifold is connected with the inlet of the engine, the outlet of the engine is connected with the inlet of the exhaust manifold, The outlet of the exhaust manifold is connected to the inlet of the turbine, the outlet of the turbine is connected to the inlet of the exhaust pipe, the compressor is connected to the turbine through a connecting shaft, and it is characterized in that it also includes the upper wall surface of the volume chamber , 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, and the rear wall of the volume cavity are fixedly connected as one. The first connecting pipe is installed between the air intake pipe and the left wall of the volume chamber, and the second connecting pipe Installed between the exhaust pipe and the right wall of the volume chamber, the third connecting pipe is installed between the main exhaust pipe and the upper wall of the volume chamber, the cross section of the volume chamber is rectangular, and the moving body is installed in the volume chamber The inner wall surface is in sealing contact, and the moving body is connected with the lower wall surface of the volume cavity through the elastic component. The elastic part is a spring.

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 a medium-speed working condition, the exhaust pressure in the exhaust manifold is low, and the moving body moves upward under the action of the elastic component, the exhaust gas recirculation rate increases, the exhaust temperature decreases, and the overall performance of the engine is better; When the engine is in a high-speed working condition, the exhaust pressure in the exhaust manifold is high, so that the moving body moves downward after overcoming the elastic force of the elastic component, the exhaust gas recirculation rate decreases, and the engine power is better. The performance of the whole machine 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 an exhaust gas recirculation system with a turbocharger. The exhaust gas recirculation system does not require a special exhaust gas recirculation rate control mechanism.

Description of drawings

Fig. 1 is a structural schematic diagram of an exhaust gas recirculation system controlled by exhaust pressure in the present invention;

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

Among them: 1. Intake pipe, 2. Compressor, 3. Connecting shaft, 4. Compressor outlet pipe, 5. Intercooler, 6. Intake main pipe, 7. Engine, 8. Exhaust main pipe, 9. Turbine, 10. Exhaust pipe, 11. First connecting pipe, 12. Second connecting pipe, 13. Volume chamber, 14. Upper wall of volume chamber, 15. Lower wall of volume chamber, 16. Left wall of volume chamber, 17. Volume chamber Right wall, 18, the front wall of the volume cavity, 19, the rear wall of the volume cavity, 20, the elastic component, 21, the moving body, 22, the third 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: intake pipe 1, compressor 2, connecting shaft 3, compressor outlet pipe 4, intercooler 5, intake main pipe 6, engine 7, exhaust main pipe 8, turbine 9. Exhaust pipe 10, first connecting pipe 11, second connecting pipe 12, volume cavity 13, volume cavity upper wall 14, volume cavity lower wall 15, volume cavity left wall 16, volume cavity right wall 17, volume cavity front Wall surface 18, volume cavity rear wall surface 19, elastic member 20, moving body 21 and the third connecting pipe 22, the air outlet of air inlet pipe 1 is connected with the air inlet of compressor 2, and the air outlet of air compressor 2 is connected with the outlet of air compressor. The air inlet of the air pipe 4 is connected, the air outlet of the compressor air outlet pipe 4 is connected with the air inlet of the intercooler 5, the air outlet of the intercooler 5 is connected with the air inlet of the intake manifold 6, and the air inlet The air outlet of main pipe 6 is connected with the air inlet of engine 7, and the air outlet of engine 7 is connected with the air inlet of exhaust main pipe 8, and the air outlet of exhaust main pipe 8 is connected with the air inlet of turbine 9, and turbine The air outlet of 9 is connected with the air inlet of the exhaust pipe 10, the compressor 2 is connected with the turbine 9 through the connecting shaft 3, the upper wall of the volume chamber 14, the lower wall of the volume chamber 15, the left wall of the volume chamber 16, the right side of the volume chamber The wall surface 17, the front wall surface 18 of the volume chamber, and the rear wall surface 19 of the volume chamber are fixedly connected as one, the first connecting pipe 11 is installed between the intake pipe 1 and the left wall surface 16 of the volume chamber, and the second connecting pipe 12 is installed between the exhaust pipe 10 and the left wall surface 16 of the volume chamber. Between the right wall surface 17 of the volume chamber, the third connecting pipe 22 is installed between the exhaust manifold 8 and the upper wall surface 14 of the volume chamber, the cross section of the volume chamber 13 is rectangular, and the moving body 21 is installed in the volume chamber 13 and connected with the volume chamber The inner wall surface of 13 is in sealing contact, and the moving body 21 is connected with the lower wall surface 15 of the volume cavity through the elastic component 20, and the elastic component 20 is a spring.

During the working process of the present invention, the moving body 21 can move up and down in the volume cavity 13 . When the engine is in a medium-speed working condition, the exhaust pressure in the exhaust manifold 8 is low, and the moving body 21 moves upward under the action of the elastic member 20, the exhaust gas recirculation rate increases, the exhaust temperature decreases, and the overall performance of the engine is improved. Better; when the engine is in a high-speed working condition, the exhaust pressure in the exhaust manifold 8 is relatively high, so that the mobile body 21 moves downward after overcoming the elastic force of the elastic member 20, the exhaust gas recirculation rate decreases, and the engine The power performance is good, and the overall performance of the engine is excellent. Therefore, the present invention can better take into account the medium and high speed working conditions of the engine.

Claims (2)

1. exhaust gas recycling system of utilizing exhaust pressure control; Comprise suction tude (1), gas compressor (2), coupling shaft (3), gas compressor steam outlet pipe (4), intercooler (5), intake manifold (6), motor (7), exhaust manifold (8), turbine (9) and outlet pipe (10); The air outlet of suction tude (1) is connected with the suction port of gas compressor (2); The air outlet of gas compressor (2) is connected with the suction port of gas compressor steam outlet pipe (4); The air outlet of gas compressor steam outlet pipe (4) is connected with the suction port of intercooler (5); The air outlet of intercooler (5) is connected with intake manifold's (6) suction port; Intake manifold's (6) air outlet is connected with the suction port of motor (7); The air outlet of motor (7) is connected with the suction port of exhaust manifold (8); The air outlet of exhaust manifold (8) is connected with the suction port of turbine (9), and the air outlet of turbine (9) is connected with the suction port of outlet pipe (10), and gas compressor (2) is connected with turbine (9) through coupling shaft (3); It is characterized in that also comprising first connecting tube (11), second connecting tube (12), cavity volume (13), cavity volume upper wall surface (14), cavity volume lower wall surface (15), cavity volume left side wall (16), the right wall (17) of cavity volume, cavity volume front face (18), cavity volume rear surface (19), elastic member (20), moving body (21) and the 3rd connecting tube (22); Cavity volume upper wall surface (14), cavity volume lower wall surface (15), cavity volume left side wall (16), the right wall (17) of cavity volume, cavity volume front face (18), cavity volume rear surface (19) fix as one, and first connecting tube (11) is installed between suction tude (1) and the cavity volume left side wall (16), and second connecting tube (12) is installed between outlet pipe (10) and the right wall of cavity volume (17); The 3rd connecting tube (22) is installed between exhaust manifold (8) and the cavity volume upper wall surface (14); The cross section of cavity volume (13) is a rectangular, and moving body (21) is installed in the cavity volume (13) and with the internal face sealing of cavity volume (13) and contacts, and moving body (21) is connected with cavity volume lower wall surface (15) through elastic member (20).

2. the exhaust gas recycling system of utilizing exhaust pressure control according to claim 1 is characterized in that said elastic member (20) is a spring.

Images