CN102444464A - Twin-scroll single-pressure turbo system - Google Patents

Abstract

A twin-vortex single-pressure turbocharger system in the technical field of internal combustion engines comprises: an intake pipe, an intake manifold, an engine, an exhaust manifold, an exhaust pipe, a compressor, a first turbine, a second turbine, a connecting shaft, a connecting pipe and a control valve, wherein the compressor, the first turbine and the second turbine are coaxially connected via a connecting shaft, the first control valve is mounted on the intake pipe of the first turbine, the second control valve is mounted on the intake pipe of the second turbine, the third control valve is mounted on the exhaust pipe of the first turbine, the fourth control valve is mounted on the exhaust pipe of the second turbine, the fifth control valve is mounted on the connecting pipe, and the low-pressure control valve is mounted on the low-pressure connecting pipe. By adjusting the opening and closing of different control valves, three working modes of single turbine, twin turbine in parallel and twin turbine in series can be realized, as well as exhaust gas recirculation in these three working modes. The present invention has a reasonable design and a simple control strategy, and is suitable for turbocharger systems with various cylinder numbers.

Description

Twin-scroll single-pressure turbo system

technical field

The invention relates to a turbocharging system in the field of internal combustion engines, in particular to a twin-scroll single-pressure turbocharging system capable of realizing turbines working in series and in parallel.

Background technique

In the face of increasingly severe environmental and energy crises, increasing power density, reducing fuel consumption and reducing emissions have become the main directions for the development of internal combustion engines. Turbocharging is not only the most effective way to strengthen the internal combustion engine, but also achieves the purpose of reducing fuel consumption and reducing emissions at the same time, which has become an indispensable technical means of modern internal combustion engine technology. However, due to the influence of the flow characteristics of the turbocharger compressor, for the traditional single-scroll single-pressure system, the compressor can only work in a relatively narrow high-efficiency zone, which limits the wide-scale promotion of turbocharging technology. If the engine needs to operate under high pressure ratio conditions, the single-stage turbocharging system is also difficult to meet the requirements, and often needs to be realized through a complex two-stage turbocharging system.

After searching the existing technical literature, it is found that the Chinese patent application number is 200710144757.8, and the patent name is: adjustable successive load turbocharging system. Parallel turbocharging, intake and exhaust bypass turbocharging, and high-condition exhaust turbocharging expand the operating range of the turbocharged diesel engine and improve the performance of the turbocharged diesel engine in the full range of working conditions; but this invention The matching relationship between the turbine and the compressor cannot be adjusted.

Contents of the invention

Aiming at the deficiencies of the above-mentioned prior art, the present invention provides a twin-scroll single-pressure turbocharging system, which can not only adjust the flow range of the turbine, but also realize three working modes of single turbine, twin-turbo parallel, and twin-turbo series , and exhaust gas recirculation in these three working modes.

The present invention is achieved through the following technical proposals, and the present invention comprises: intake pipe, air compressor, connecting shaft, intake main pipe, intercooler, engine, exhaust main pipe, exhaust pipe, the first turbine intake pipe, the second The turbine inlet pipe, the first turbine, the second turbine, the first turbine exhaust pipe and the second turbine exhaust pipe, the air outlet of the air intake pipe is connected with the air inlet of the compressor, and the air outlet of the compressor is connected with the air intake main pipe The air intake port is connected, the air outlet of the intake manifold is connected with the intake port of the engine, the air outlet of the engine is connected with the intake port of the exhaust manifold, the intercooler is installed on the intake manifold, and the inlet of the first turbine intake pipe The air inlet and the air inlet of the second turbine intake pipe are all connected to the air outlet of the exhaust manifold, and the air inlet and outlet of the first turbine are respectively connected to the air outlet of the first turbine air intake pipe and the air inlet of the first turbine exhaust pipe , the air inlet and outlet of the second turbine are respectively connected with the air outlet of the second turbine intake pipe and the air inlet of the second turbine exhaust pipe, and the air outlets of the first turbine exhaust pipe and the second turbine exhaust pipe are connected with the exhaust pipe The air inlets of the tubes are connected, and the compressor, the first turbine and the second turbine are coaxially connected through a connecting shaft.

It also includes connecting pipes, a first control valve, a second control valve, a third control valve, a fourth control valve and a fifth control valve, the connecting pipes are installed on the exhaust pipe of the first turbine and the intake pipe of the second turbine Between, the first control valve is installed on the intake pipe of the first turbine, the second control valve is installed on the intake pipe of the second turbine, the third control valve is installed on the exhaust pipe of the first turbine, and the second control valve is installed on the exhaust pipe of the first turbine. Four control valves are installed on the exhaust pipe of the second turbine, and the fifth control valve is installed on the connecting pipe.

It also includes a low-pressure connecting pipe, a low-pressure control valve and a low-pressure intercooler, the low-pressure connecting pipe is installed between the intake pipe and the exhaust pipe, and both the low-pressure control valve and the low-pressure intercooler are installed on the low-pressure connecting pipe.

During the working process of the present invention, by adjusting the opening and closing of different control valves, three working modes of single turbo, twin turbos in parallel, and twin turbos in series can be realized, as well as exhaust gas recirculation in these three working modes. When the first control valve and the third control valve are opened at the same time, and the second control valve, the fourth control valve and the fifth control valve are closed at the same time, the first turbine can work alone; when the first control valve, the third control valve When the fifth control valve is closed at the same time, and the second control valve and the fourth control valve are opened at the same time, the second turbine can work alone; when the first control valve, the second control valve, the third control valve and the fourth control valve When the fifth control valve is opened simultaneously and the fifth control valve is closed, the parallel operation of the first turbine and the second turbine can be realized; when the first control valve, the fourth control valve and the fifth control valve are opened simultaneously, the second control valve and the third control valve When closed simultaneously, the series operation of the first turbine and the second turbine can be realized. In these three working modes, exhaust gas recirculation can be realized: by adjusting the opening of the low-pressure control valve, the exhaust gas recirculation rate can be adjusted; when the low-pressure control valve is fully opened, the maximum amount of exhaust gas can pass through the low-pressure connecting pipe , the exhaust gas recirculation rate is maximum. Cooling of the engine intake air is achieved via an intercooler and cooling of the exhaust gas recirculation gas is achieved via a low-pressure intercooler.

Compared with the prior art, the present invention has the following beneficial effects: the present invention is reasonable in design, simple in control strategy, applicable to turbocharging systems with various cylinder numbers, can not only adjust the flow range of the turbine, but also realize single turbine, There are three working modes of twin-turbo parallel and twin-turbo series, and exhaust gas recirculation in these three working modes. The single turbine operation can ensure that the compressor works in the high-efficiency area at low flow rate to prevent surge; the parallel operation of the twin turbines can ensure that the compressor works in the high-efficiency area at high flow rate to prevent blockage; The engine's demand for high pressure ratio can effectively improve the engine power. Nitrogen oxides in the exhaust gas can be further reduced by exhaust gas recirculation.

Description of drawings

Fig. 1 is the structural representation of twin-scroll single-pressure turbocharging system of the present invention;

Among them: 1. Intake pipe, 2. Compressor, 3. Connecting shaft, 4. Intake manifold, 5. Intercooler, 6. Engine, 7. Exhaust manifold, 8. The first turbine intake pipe, 9. The first Two turbine intake pipes, 10, the first turbine, 11, the second turbine, 12, the first turbine exhaust pipe, 13, the second turbine exhaust pipe, 14, the exhaust pipe, 15, the first control valve, 16, The second control valve, 17, the third control valve, 18, the fourth control valve, 19, the connecting pipe, 20, the fifth control valve, 21, the low pressure connecting pipe, 22, the low pressure control valve, 23, the low pressure intercooler.

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, the present invention comprises: intake pipe 1, compressor 2, connecting shaft 3, intake main pipe 4, intercooler 5, engine 6, exhaust main pipe 7, exhaust pipe 14, the first turbine intake pipe 8. Second turbine intake pipe 9, first turbine 10, second turbine 11, first turbine exhaust pipe 12, second turbine exhaust pipe 13, connecting pipe 19, first control valve 15, second control valve 16 , the third control valve 17, the fourth control valve 18, the fifth control valve 20, the low-pressure connecting pipe 21, the low-pressure control valve 22 and the low-pressure intercooler 23, the air outlet of the intake pipe 1 is connected with the air inlet of the compressor 2 , the air outlet of compressor 2 links to each other with the air inlet of intake main pipe 4, the air outlet of air intake main pipe 4 links to each other with the air inlet of engine 6, the air outlet of engine 6 links to each other with the air inlet of exhaust main pipe 7, The intercooler 5 is installed on the air intake main pipe 4, the air inlet of the first turbine intake pipe 8 and the air inlet of the second turbine air intake pipe 9 are all connected with the air outlet of the exhaust main pipe 7, the inlet and outlet of the first turbine 10 The gas port is connected with the gas outlet of the first turbine intake pipe 8 and the gas inlet of the first turbine exhaust pipe 12 respectively, and the gas inlet and outlet of the second turbine 11 are connected with the gas outlet of the second turbine intake pipe 9 and the second turbine exhaust respectively. The air inlet of pipe 13 links to each other, the gas outlet of first turbine exhaust pipe 12, the second turbine exhaust pipe 13 all links to each other with the air inlet of exhaust pipe 14, compressor 2, first turbine 10, second turbine 11 are coaxially connected through the connecting shaft 3, the connecting pipe 19 is installed between the first turbine exhaust pipe 12 and the second turbine intake pipe 9, the first control valve 15 is installed on the first turbine intake pipe 8, The second control valve 16 is installed on the second turbine intake pipe 9, the third control valve 17 is installed on the first turbine exhaust pipe 12, the fourth control valve 18 is installed on the second turbine exhaust pipe 13, the fifth control valve The valve 20 is installed on the connecting pipe 19, the low-pressure connecting pipe 21 is installed between the intake pipe 1 and the exhaust pipe 14, and the low-pressure control valve 22 and the low-pressure intercooler 23 are all installed on the low-pressure connecting pipe 21.

During the working process of the present invention, by adjusting the opening and closing of different control valves, three working modes of single turbo, twin turbos in parallel, and twin turbos in series can be realized, as well as exhaust gas recirculation in these three working modes. When the first control valve 15 and the third control valve 17 are opened at the same time, and the second control valve 16, the fourth control valve 18 and the fifth control valve 20 are closed at the same time, the first turbine 10 can work alone; when the first control valve When the valve 15, the third control valve 17 and the fifth control valve 20 are closed at the same time, and the second control valve 16 and the fourth control valve 18 are opened at the same time, the second turbine 11 can work alone; when the first control valve 15, the second control valve When the second control valve 16, the third control valve 17 and the fourth control valve 18 are opened at the same time, and the fifth control valve 20 is closed, the parallel operation of the first turbine 10 and the second turbine 11 can be realized; when the first control valve 15, the second When the four control valves 18 and the fifth control valve 20 are opened at the same time, and the second control valve 16 and the third control valve 17 are closed at the same time, the first turbine 10 and the second turbine 11 can work in series. Under these three working modes, exhaust gas recirculation can be realized: by adjusting the opening of the low-pressure control valve 22, the exhaust gas recirculation rate can be adjusted; when the low-pressure control valve is fully opened, there is a maximum amount of Exhaust gas passes through with maximum exhaust gas recirculation rate. The cooling of the intake air of the engine can be realized by the intercooler 5 , and the cooling of the exhaust gas recirculation gas can be realized by the low-pressure intercooler 23 .

Claims (3)

1. two whirlpools list is pressed turbo charge system; Comprise: suction tude (1), gas compressor (2), coupling shaft (3), intake manifold (4), intercooler (5), motor (6), exhaust manifold (7) and outlet pipe (14); The air outlet of suction tude (1) links to each other with the suction port of gas compressor (2); The air outlet of gas compressor (2) links to each other with intake manifold's (4) suction port; Intake manifold's (4) air outlet links to each other with the suction port of motor (6); The air outlet of motor (6) links to each other with the suction port of exhaust manifold (7); Intercooler (5) is installed on the intake manifold (4); It is characterized in that also comprising first gas inlet casing (8), second gas inlet casing (9), first turbine (10), second turbine (11), first turbine exhaust pipe (12) and second turbine exhaust pipe (13); The suction port of the suction port of first gas inlet casing (8), second gas inlet casing (9) all links to each other with the air outlet of exhaust manifold (7), and the air inlet/outlet of first turbine (10) links to each other with the air outlet of first gas inlet casing (8), the suction port of first turbine exhaust pipe (12) respectively, and the air inlet/outlet of second turbine (11) links to each other with the air outlet of second gas inlet casing (9), the suction port of second turbine exhaust pipe (13) respectively; The air outlet of first turbine exhaust pipe (12), second turbine exhaust pipe (13) all links to each other with the suction port of outlet pipe (14), and gas compressor (2), first turbine (10), second turbine (11) link to each other through coupling shaft (3) is coaxial.

2. the according to claim 1 pair of single turbo charge system of pressing in whirlpool; It is characterized in that also comprising: connecting tube (19), first control valve (15), second control valve (16), the 3rd control valve (17), the 4th control valve (18) and the 5th control valve (20); Connecting tube (19) is installed between said first turbine exhaust pipe (12) and said second gas inlet casing (9); First control valve (15) is installed on said first gas inlet casing (8); Second control valve (16) is installed on said second gas inlet casing (9); The 3rd control valve (17) is installed on said first turbine exhaust pipe (12), and the 4th control valve (18) is installed on said second turbine exhaust pipe (13), and the 5th control valve (20) is installed on the connecting tube (19).

3. the according to claim 3 pair of single turbo charge system of pressing in whirlpool; It is characterized in that also comprising: low-pressure connection tube (21), low-pressure control valve (22) and low pressure intercooler (23); Low-pressure connection tube (21) is installed between said suction tude (1) and the said outlet pipe (14), and low-pressure control valve (22) and low pressure intercooler (23) are installed on the low-pressure connection tube (21).

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