Sequential supercharging exhaust pipe

Abstract

The invention discloses a sequential supercharging exhaust pipe which comprises an exhaust pipe behind a turbine, the interior of the exhaust pipe behind the turbine is of a cavity structure, and the exhaust pipe behind the turbine comprises a normally-open exhaust gas turbocharger turbine connector, an exhaust port, two controlled exhaust gas turbocharger turbine outlet connectors and two exhaust gas bypass connectors. The normally open exhaust gas turbocharger turbine interface is communicated with the normally open exhaust gas turbocharger turbine outlet, the two controlled exhaust gas turbocharger turbine outlet interfaces are respectively communicated with the two controlled exhaust gas turbocharger turbine outlets, and the two exhaust gas bypass interfaces are respectively connected with the two exhaust gas bypass valve shells; according to the sequential turbocharging exhaust pipe, the complexity of a sequential turbocharging exhaust system can be effectively reduced, the compactness of an engine is improved, the faults such as clamping stagnation of the gas valve in the operation process of the engine are reduced, the gas leakage problem at the joint of the gas control valve and the exhaust pipe is avoided, and the operation stability of the engine is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of engine exhaust technology, specifically to a sequential turbocharged exhaust pipe. Background Technology

[0002] In recent years, with increasingly stringent requirements for engine power, economy, and emissions in the power sector, exhaust gas turbocharging technology, as one of the key components affecting engine performance, has been widely applied in engine intake and exhaust systems. Exhaust gas turbocharging utilizes the energy of engine exhaust gases to drive an exhaust turbine, which in turn increases intake pressure and flow rate via a compressor. Successive turbocharging refers to a turbocharging system consisting of two or more turbochargers connected in parallel, generally used to improve engine performance under low-load conditions. The high-temperature exhaust gases from the engine cylinders enter both a normally open turbocharger and a controlled turbocharger. The operation of the controlled turbocharger is controlled by air and gas valves. As the engine load increases, the controlled turbochargers engage one by one, thereby increasing the boost pressure under low-load conditions and providing improved engine performance.

[0003] Existing patent CN116104631 A discloses a sequential turbocharging system with an air-collecting chamber, which mainly includes an exhaust gas turbocharger assembly and a main engine air circuit assembly. The air-collecting chamber is equipped with multiple air inlets and one air outlet, avoiding the difficulties in pipeline layout and maintenance caused by each exhaust gas turbocharger's pressure end being independently connected to an air inlet. Its shortcomings include a still relatively complex pipeline layout, significant differences in the exhaust pipe structures connecting multiple exhaust gas turbochargers, and the possibility of uneven operation among the turbochargers.

[0004] Existing patent CN118640092 A discloses a sequential turbocharged exhaust system, which mainly includes four turbochargers in rows A / B, a three-way turbine exhaust pipe in rows A / B, a gas control butterfly valve, and a bellows. The gas valve is located at the turbine exhaust pipe interface. By controlling the opening and closing of the gas valve, the high-temperature gas enters the exhaust gas turbocharger. Its drawback is that, due to the high gas temperature, the bellows can mitigate the thermal deformation caused by the high-temperature gas to a certain extent. However, due to the interface between the gas control butterfly valve and the exhaust pipe, gas leakage may occur under certain operating conditions during long-term operation. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the existing defects and provide a sequential turbocharged exhaust pipe that can be folded and carried, which can effectively reduce the complexity of the sequential turbocharged exhaust system, improve the engine compactness, reduce the occurrence of faults such as gas valve jamming during engine operation, and avoid air leakage at the interface between the gas control valve and the exhaust pipe, thus effectively solving the problems in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a sequential turbocharger exhaust pipe, including a turbocharger exhaust pipe, wherein the turbocharger exhaust pipe has a cavity structure inside, and the turbocharger exhaust pipe includes a normally open exhaust gas turbocharger turbine interface, an exhaust port, two controlled exhaust gas turbocharger turbine outlet interfaces, and two exhaust gas bypass interfaces.

[0007] The normally open exhaust gas turbocharger turbine interface is connected to the normally open exhaust gas turbocharger turbine outlet, the two controlled exhaust gas turbocharger turbine outlet interfaces are respectively connected to the two controlled exhaust gas turbocharger turbine outlets, and the two exhaust gas bypass interfaces are respectively connected to the two exhaust gas bypass valve housings.

[0008] The turbine outlet interfaces of the two controlled exhaust gas turbochargers are respectively equipped with rotatable gas control valve plates in rows A and B.

[0009] As a preferred embodiment of the present invention, the gas control valve plates of column A and column B are both installed in the exhaust pipe after the vortex via the upper flange and lower flange of the gas control valve. The gas control valve plates of column A and column B are both connected to the gas control valve body outside the exhaust pipe after the vortex via the valve shaft of the gas control valve. The angle of the gas control valve plates of column A and column B is changed by controlling the rotation of the valve shaft of the gas control valve.

[0010] As a preferred embodiment of the present invention, the gas control valve plates of column A and column B form a sealing structure with the protruding structure inside the exhaust pipe after the turbine.

[0011] As a preferred embodiment of the present invention, the two exhaust gas bypass ports in the exhaust pipe are connected to the exhaust gas bypass valve housing via plug-in sleeves.

[0012] As a preferred embodiment of the present invention, the plug-in sleeve is connected to the exhaust pipe via a first double-layer sealing ring, and the plug-in sleeve is connected to the waste gas bypass valve housing via a second double-layer sealing ring.

[0013] As a preferred embodiment of the present invention, an exhaust gas bypass valve is installed inside the exhaust gas bypass valve housing. The valve structure of the exhaust gas bypass valve forms a seal with the cavity structure inside the exhaust gas bypass valve housing. The exhaust gas bypass valve realizes the function of closing and opening the exhaust gas bypass pipeline by moving the valve structure.

[0014] As a preferred embodiment of the present invention, the corresponding interface on the exhaust pipe is connected to the turbine outlet of the normally open exhaust gas turbocharger and the turbine outlet of the controlled exhaust gas turbocharger through exhaust pipe clamps.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: The sequential turbocharger exhaust pipe integrates a sequential turbocharger control valve and an exhaust gas bypass valve. The gas control valve is located inside the exhaust pipe after the turbocharger, which can effectively reduce the operating temperature of the gas control valve and reduce the possibility of gas valve failure. The gas control valve eliminates the valve shell structure in the pipe section, avoiding the occurrence of gas control valve interface leakage and other failures caused by thermal deformation due to high temperature. The exhaust gas bypass valve is directly connected to the exhaust pipe after the turbocharger through a plug-in sleeve, and the two ends of the sleeve are sealed by double-layer sealing rings, which can compensate for the thermal deformation caused by high-temperature gas. The exhaust pipe after the turbocharger integrates a sequential turbocharger structure and an exhaust gas bypass structure, increasing the adjustability of the engine under all operating conditions and optimizing the engine's performance indicators under all operating conditions. Attached Figure Description

[0016] Figure 1 This is the front view of the present invention;

[0017] Figure 2 for Figure 1 Side view after being laid down;

[0018] Figure 3 This is a main sectional view of the present invention;

[0019] Figure 4 for Figure 2 A schematic diagram of the center section;

[0020] Figure 5 for Figure 1 A schematic diagram of a system in operation with one turbocharger;

[0021] Figure 6 for Figure 1 A schematic diagram of the structure in operation with two turbochargers;

[0022] Figure 7 for Figure 1 A schematic diagram of the structure in operation with 3 turbochargers;

[0023] Figure 8 for Figure 4 A schematic diagram of the structure with the exhaust bypass valve in the open state.

[0024] In the diagram: 1. Exhaust pipe after the vortex; 2. Gas control valve plate (row A); 3. Gas control valve plate (row B); 4. Gas control valve body; 5. Gas control valve shaft; 6. Gas control valve upper flange; 7. Gas control valve lower flange; 8. Exhaust pipe clamp; 9. Waste gas bypass valve housing; 10. Waste gas bypass valve; 11. Insert sleeve; 12. First double-layer sealing ring; 13. Second double-layer sealing ring. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Please see Figure 1-2 The present invention provides a technical solution: a sequential turbocharged exhaust pipe, including a turbocharger exhaust pipe 1. The turbocharger exhaust pipe 1 has a hollow structure inside. The turbocharger exhaust pipe 1 includes a normally open exhaust gas turbocharger turbine interface, an exhaust port, two controlled exhaust gas turbocharger turbine outlet interfaces, and two exhaust gas bypass interfaces. The normally open exhaust gas turbocharger turbine interface and the exhaust port are located in the middle, and the two controlled exhaust gas turbocharger turbine outlet interfaces and the two exhaust gas bypass interfaces are located on both sides of the centerline of the turbocharger exhaust pipe 1.

[0027] The normally open exhaust gas turbocharger turbine interface is connected to the normally open exhaust gas turbocharger turbine outlet, the two controlled exhaust gas turbocharger turbine outlet interfaces are respectively connected to the two controlled exhaust gas turbocharger turbine outlets, and the two exhaust gas bypass interfaces are respectively connected to the two exhaust gas bypass valve housings 9.

[0028] The turbine outlet interfaces of the two controlled exhaust gas turbochargers are respectively equipped with rotatable gas control valve plates 2 (A-row) and 3 (B-row).

[0029] To avoid leakage at the gas control valve interface due to thermal deformation caused by high-temperature gas, both the gas control valve plate 2 of column A and the gas control valve plate 3 of column B are installed inside the exhaust pipe 1 after the turbocharger via the upper flange 6 and the lower flange 7 of the gas control valve. Both the gas control valve plate 2 of column A and the gas control valve plate 3 of column B are connected to the gas control valve body 4 outside the exhaust pipe 1 via the gas control valve shaft 5. By controlling the rotation of the gas control valve shaft 5, the angle of the gas control valve plate 2 of column A and the gas control valve plate 3 of column B can be changed. The gas control valve of this invention is located in the exhaust pipe 1 after the turbocharger, that is, after the outlet of the exhaust gas turbocharger. Its gas temperature is 100°C to 200°C lower than that before the exhaust gas turbocharger, which can effectively reduce the operating temperature of the gas control valve and reduce the possibility of gas valve jamming and other malfunctions.

[0030] In order to cut off the gas flow and shut down the exhaust gas turbocharger, the gas control valve plate 2 of column A and the gas control valve plate 3 of column B form a sealing structure with the internal protrusion structure of the exhaust pipe 1.

[0031] To reduce the complexity of the exhaust pipeline and to reduce leakage by using a plug-in structure, the two exhaust bypass ports in the exhaust pipe 1 are connected to the exhaust bypass valve housing 9 via plug-in sleeves 11. The connection between the plug-in sleeves 11 and the exhaust pipe 1 is sealed by a first double-layer sealing ring 12, and the plug-in sleeves 11 and the exhaust bypass valve housing 9 are sealed by a second double-layer sealing ring 13.

[0032] To further enhance sealing, an exhaust gas bypass valve 10 is installed inside the exhaust gas bypass valve housing 9. The valve structure of the exhaust gas bypass valve 10 forms a seal with the pipe structure inside the exhaust gas bypass valve housing 9. The exhaust gas bypass valve 10 achieves the function of closing and opening the exhaust gas bypass pipeline by moving the valve structure.

[0033] To facilitate the connection of the exhaust pipe 1 after the turbocharger to other turbochargers, the corresponding interface on the exhaust pipe 1 is connected to the turbine outlet of the normally open exhaust gas turbocharger and the turbine outlet of the controlled exhaust gas turbocharger through the exhaust pipe clamp 8.

[0034] When the engine is running at low operating conditions, such as Figure 5 As shown, in the exhaust pipe 1 after the turbine, both the gas control valve plate 2 in row A and the gas control valve plate 3 in row B are in the closed state, as... Figure 8 As shown, the exhaust bypass valve 10 is closed, the exhaust pipe 1 after the turbocharger is connected only through the middle pipe, and one exhaust turbocharger is in operation.

[0035] When the engine is running under 30%-70% load conditions, such as Figure 6 As shown in Figure 5 Based on this, the gas control valve plate 2 in column A of the exhaust pipe 1 rotates under the drive of the gas control valve shaft 5 and is in the open state. The middle pipe and column A pipe of exhaust pipe 1 are connected, and the two exhaust gas turbochargers are in working state.

[0036] When the engine is running at 70% to 110% load, such as Figure 7 As shown in Figure 6 Based on this, the gas control valve plate 3 in the B row of the exhaust pipe 1 rotates under the drive of the gas control valve shaft 5 and is in the open state. The middle pipe, A row pipe and B row pipe of the exhaust pipe 1 are connected, and all three exhaust gas turbochargers are in working state.

[0037] When the engine is Figure 6 and Figure 7 As shown, under 60%–70% load conditions, with two exhaust gas turbochargers operating, or under 90%–110% load conditions, with three exhaust gas turbochargers operating, such as Figure 4 As shown in Figure 8Based on this, the exhaust bypass valve 10 receives a control signal and moves, opening the exhaust bypass pipeline. Some of the high-temperature gas passes through the exhaust bypass valve housing 9 and directly enters the atmosphere through the exhaust pipe 1.

[0038] Furthermore, to further improve the low-condition performance of the turbocharged engine, the exhaust bypass valve 10 can be opened, that is, to add an exhaust bypass working state in which one exhaust gas turbocharger of the engine is running.

[0039] The parts of the invention not described in detail are prior art. Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A sequentially pressurized exhaust pipe, characterized in that: It includes a turbo exhaust pipe (1), the turbo exhaust pipe (1) has a cavity structure inside, the turbo exhaust pipe (1) includes a normally open exhaust gas turbocharger turbine interface, an exhaust port, two controlled exhaust gas turbocharger turbine outlet interfaces and two exhaust gas bypass interfaces. The normally open exhaust gas turbocharger turbine interface is connected to the normally open exhaust gas turbocharger turbine outlet, the two controlled exhaust gas turbocharger turbine outlet interfaces are respectively connected to the two controlled exhaust gas turbocharger turbine outlets, and the two exhaust gas bypass interfaces are respectively connected to the two exhaust gas bypass valve housings (9). Rotatable gas control valve plates (2) and (3) of column A and column B are respectively installed in the turbine outlet interfaces of the two controlled exhaust gas turbochargers.

2. The sequential booster exhaust pipe according to claim 1, characterized in that: The gas control valve plate (2) of column A and the gas control valve plate (3) of column B are both installed in the exhaust pipe (1) after the vortex via the upper flange (6) and the lower flange (7) of the gas control valve. The gas control valve plate (2) of column A and the gas control valve plate (3) of column B are both connected to the gas control valve body (4) outside the exhaust pipe (1) of column B via the valve shaft (5) of the gas control valve. The angle of the gas control valve plate (2) of column A and the gas control valve plate (3) of column B is changed by controlling the rotation of the valve shaft (5).

3. A sequential pressurization exhaust pipe according to claim 1 or 2, characterized in that: The gas control valve plate (2) of column A and the gas control valve plate (3) of column B form a sealing structure with the internal protrusion structure of the exhaust pipe (1) after the vortex.

4. The sequential booster exhaust pipe according to claim 1, characterized in that: The two exhaust gas bypass ports in the exhaust pipe (1) are connected to the exhaust gas bypass valve housing (9) via a plug-in sleeve (11).

5. A sequential booster exhaust pipe according to claim 4, characterized in that: The plug-in sleeve (11) is sealed to the exhaust pipe (1) by a first double-layer sealing ring (12), and the plug-in sleeve (11) is sealed to the waste gas bypass valve housing (9) by a second double-layer sealing ring (13).

6. A sequential pressurization exhaust pipe according to claim 1, characterized in that: An exhaust gas bypass valve (10) is installed inside the exhaust gas bypass valve housing (9). The valve structure of the exhaust gas bypass valve (10) forms a seal with the pipe structure inside the exhaust gas bypass valve housing (9). The exhaust gas bypass valve (10) realizes the function of closing and opening the exhaust gas bypass pipeline by moving the valve structure.

7. A sequential pressurization exhaust pipe according to claim 1, characterized in that: The corresponding interface on the exhaust pipe (1) is connected to the turbine outlet of the normally open exhaust gas turbocharger and the turbine outlet of the controlled exhaust gas turbocharger through exhaust pipe clamps (8).

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