CN203098039U - Two-stage turbocharger applicable to heavy-duty diesel engine - Google Patents

Abstract

The utility model relates to a turbocharger, which belongs to the structural field of thermal energy and power machinery, in particular to a two-stage turbocharger applied to a heavy-duty diesel engine, including a low-pressure exhaust gas turbocharger fixedly connected together and a high-pressure stage exhaust gas turbocharger, the low-pressure stage exhaust gas turbocharger includes a first compressor, a first intermediate casing, and a low-pressure stage volute installed together in sequence, and the high-pressure stage exhaust gas turbocharger includes sequentially The second compressor, the second intermediate casing, and the high-pressure stage volute installed together. The utility model can reduce the space required for the installation of the pipeline at the compressor end, make the structure of the whole two-stage turbocharger more compact, and have better space arrangement advantages in engine arrangement.

Description

A Two-Stage Turbocharger Applied to Heavy-Duty Diesel Engines

technical field

The utility model relates to a turbocharger, which belongs to the structural field of thermal energy and power machinery, in particular to a two-stage turbocharger applied to a heavy-duty diesel engine.

Background technique

In the application of a two-stage supercharged exhaust gas turbocharger, the exhaust gas discharged from the engine first enters the high-pressure stage turbine casing through the exhaust manifold to perform the first-stage expansion work, and then passes through the high-pressure stage volute and the low-pressure stage volute respectively. The intermediate pipeline enters the low-pressure stage turbine for the second-stage expansion work; because the system has an intermediate pipeline and V-shaped clamps or bolts used to connect the pipeline, the traditional two-stage booster connected through the intermediate pipeline The compressor system has some shortcomings, such as a large number of system components; the system requires a large engine installation space, and at the same time there are many connection interfaces, which seriously affect the airtightness of the pipeline.

Contents of the invention

In view of the above problems, the utility model provides a two-stage turbocharger applied to heavy-duty diesel engines. The two-stage turbocharger does not need intermediate auxiliary connecting pipelines or additional connecting parts, which can reduce the installation of pipelines at the compressor end. space required.

According to the technical solution of the utility model: a two-stage turbocharger applied to heavy-duty diesel engines, including a low-pressure stage exhaust gas turbocharger and a high-pressure stage exhaust gas turbocharger fixedly connected together, the low-pressure stage exhaust gas turbocharger The supercharger includes a first compressor, a first intermediate casing, and a low-pressure stage volute that are installed together in sequence, and the high-pressure stage exhaust gas turbocharger includes a second compressor, a second intermediate casing, and a high-pressure stage that are installed together in sequence. The stage volute is characterized in that: the inlet of the low-pressure stage volute is directly sealed to the first gas outlet of the high-pressure stage volute, and the second gas outlet of the second compressor is oriented parallel to the axial direction of the second compressor , pointing to the side of the second middle shell.

As a further improvement of the utility model, more than one mounting bracket is arranged on the low-pressure stage volute.

As a further improvement of the present utility model, the air inlet of the low-pressure stage volute is fixedly connected with the first air outlet of the high-pressure stage volute by bolts.

As a further improvement of the present utility model, the air inlet of the low-pressure stage volute is fixedly connected with the first air outlet of the high-pressure stage volute through a V-shaped clamp.

The technical effect of the utility model lies in: the utility model reduces the number of parts connected between the high and low pressure volutes by directly connecting the high and low pressure exhaust gas turbochargers, and this structure has fewer sealing surfaces and connectors , thereby improving the reliability of the system; at the same time, the low-pressure stage volute is provided with a through-mount bracket, which can be directly connected to the engine and fixed, reducing the number of parts of the turbocharger system, the system structure is more compact, and the required installation space is smaller; The outlet direction of the two-stage compressor has been optimized, which can reduce the space required for the installation of the pipeline at the compressor end, make the structure of the entire two-stage turbocharger more compact, and have better space layout advantages in engine layout.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Fig. 2 is a structural side view of the utility model.

Fig. 3 is a side view of the structure of the utility model.

Detailed ways

Below in conjunction with accompanying drawing, the specific embodiment of the present utility model is described further.

As shown in Figures 1 to 3, it includes a low-pressure stage exhaust gas turbocharger 1, a high-pressure stage exhaust gas turbocharger 2, a first compressor 3, a low-pressure stage volute 4, a second compressor 5, and a high-pressure stage volute 6 , Air inlet 7, first air outlet 8, second air outlet 9, second middle shell 10, first middle shell 11, mounting bracket 12, etc.

As shown in Figure 1, the utility model is a two-stage turbocharger, comprising a low-pressure stage exhaust gas turbocharger 1 and a high-pressure stage exhaust gas turbocharger 2 fixedly connected together, the low-pressure stage exhaust gas turbocharger The compressor 1 includes a first compressor 3, a first intermediate shell 11, and a low-pressure stage volute 4 installed together in sequence, and the high-pressure stage exhaust gas turbocharger 2 includes a second compressor 5, a second compressor installed in sequence Two intermediate casings 10, high-pressure stage volute 6, the air inlet 7 of the low-pressure stage volute 4 is directly sealed and connected to the first air outlet 8 of the high-pressure stage volute 6, and the second air outlet of the second compressor 5 9 is oriented parallel to the axial direction of the second compressor 5 and directed to the side of the second intermediate shell 10 .

More than one mounting bracket 12 is arranged on the low-pressure stage volute 4 .

The air inlet 7 of the low-pressure stage volute 4 is fixedly connected with the first air outlet 8 of the high-pressure stage volute 6 through bolts.

The air inlet 7 of the low-pressure stage volute 4 is fixedly connected with the first air outlet 8 of the high-pressure stage volute 6 through a V-shaped clamp.

The working process of the utility model is as follows: the exhaust gas of the automobile engine first enters the high-pressure exhaust gas turbocharger 2 through the exhaust manifold, and then enters the high-pressure turbine through the high-pressure volute 6 to expand and perform work. After the exhaust gas expands, it passes through the first gas outlet. 8 directly enters the volute 4 of the low pressure stage, and enters the turbine of the low pressure stage through the diversion of the flow channel of the volute 4 of the low pressure stage to perform secondary expansion work, and then flows out through the gas outlet of the volute 4 of the low pressure stage. At the compressor end, the fresh air passing through the air filter first enters the first compressor 3, and the coaxial impeller driven by the low-pressure stage turbine compresses the air, so that the air is compressed and the pressure increases. After the first compression, the air enters To the second compressor 5, it is compressed again, and finally enters the engine to participate in combustion.

The utility model reduces the number of parts connected between the high and low pressure stage volutes by directly connecting the high and low pressure stage exhaust gas turbochargers. This structure has fewer sealing surfaces and connecting parts, thereby improving the reliability of the system At the same time, the low-pressure stage volute is equipped with a through-mounting bracket, which can be directly connected to the engine, reducing the number of parts in the supercharger system, making the system more compact and requiring less installation space; the outlet direction of the high-pressure stage compressor has been optimized. The design can reduce the space required for the installation of the pipeline at the compressor end, and make the structure of the entire two-stage turbocharger more compact, so that there is a better space arrangement advantage in the engine layout.

Claims (4)

1. A two-stage turbocharger applied to a heavy-duty diesel engine, comprising a low-pressure stage exhaust gas turbocharger (1) and a high-pressure stage exhaust gas turbocharger (2) fixedly connected together, the low-pressure stage exhaust gas turbocharger (2) The supercharger (1) includes a first compressor (3), a first intermediate casing (11), and a low-pressure stage volute (4) installed together in sequence, and the high-pressure stage exhaust gas turbocharger (2) includes sequentially The second compressor (5), the second intermediate casing (10), and the high-pressure stage volute (6) installed together are characterized in that the air inlet (7) of the low-pressure stage volute (4) is directly sealed The first air outlet (8) connected to the high-pressure stage volute (6), the second air outlet (9) of the second compressor (5) is oriented parallel to the axial direction of the second compressor (5), pointing to the second One side of the middle shell (10). 2. A two-stage turbocharger applied to a heavy-duty diesel engine according to claim 1, characterized in that: the low-pressure stage volute (4) is provided with more than one mounting bracket (12). 3. A two-stage turbocharger applied to heavy-duty diesel engines according to claim 1, characterized in that: the air inlet (7) of the low-pressure stage volute (4) is connected to the high-pressure stage volute The first air outlet (8) of (6) is fixedly connected by bolts. 4. A two-stage turbocharger applied to heavy-duty diesel engines according to claim 1, characterized in that: the air inlet (7) of the low-pressure stage volute (4) is connected to the high-pressure stage volute The first air outlet (8) of (6) is fixedly connected by a V-shaped clamp.

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