Centralized symmetrical two-stage supercharger system of diesel engine

Abstract

The invention discloses a diesel engine centralized symmetric two-stage supercharger system, which belongs to the technical field of diesel engine superchargers, and comprises two two-stage superchargers arranged on a diesel engine, the two two-stage superchargers are symmetrically arranged above a flywheel casing, a low-stage supercharger in each two-stage supercharger is positioned above a high-stage supercharger, and a high-stage supercharger in each two-stage supercharger is positioned above a flywheel casing. A waste gas outlet communicated with the corresponding low-stage supercharger is formed in the rear side of each low-stage supercharger, a gas inlet communicated with the corresponding low-stage supercharger is formed in the front side of each low-stage supercharger, and downward waste gas inlets are formed in the sides, close to each other, of the two high-stage superchargers. Meanwhile, an air outlet pipe extending upwards is arranged on the rear side of each high-grade supercharger; the two waste gas outlets, the two gas inlets, the two waste gas inlets and the two gas outlet pipes are located on the same plane. The overall length and width of the diesel engine can be shortened, so that the diesel engine meets the use requirement of a special vehicle in a narrow space.

Description

Technical Field

[0001] The invention belongs to the technical field of diesel engine superchargers, and in particular relates to a centralized symmetrical two-stage supercharger system for a diesel engine. Background Art

[0002] A diesel engine is a reciprocating internal combustion engine that releases energy by burning diesel. Its working principle is to use compressed air to make diesel self-ignite, thereby generating high-temperature and high-pressure gas to drive the piston to move, and then convert the reciprocating linear motion of the piston into rotational motion through the connecting rod and crankshaft to output power.

[0003] Diesel engines face the problem of insufficient air intake in plateau environments, resulting in insufficient power and inability to start. If a large-flow supercharger is used to adapt to the plateau environment, insufficient low-speed torque will occur, seriously affecting the vehicle's starting and acceleration performance.

[0004] Due to the use requirements of special vehicles, they need to maintain high mobility in a plateau environment at an altitude of 5,000m. This requires the diesel engine to have sufficient power in the plateau environment. For this reason, a two-stage supercharger is designed to increase the intake volume in the plateau environment. However, the space limitation of the power compartment of special vehicles determines that the layout of the diesel engine, gearbox and power auxiliary system is very compact. The existing two-stage superchargers are arranged on both sides of the diesel engine flywheel housing. They are relatively wide and long, with poor adaptability. At the same time, the large volume will cause the supercharger support frame structure and the intake and exhaust pipeline layout to be relatively complicated. As a result, the conventional arrangement of two two-stage superchargers cannot be installed in the limited space of the power compartment of special vehicles. Summary of the invention

[0005] In order to solve the problem that the conventional arrangement of two two-stage superchargers cannot be installed in the limited space of the power compartment of a special vehicle, the present invention provides a centralized symmetrical two-stage supercharger system for a diesel engine. By integrating the two two-stage superchargers symmetrically along the axis, the length and width of the diesel engine are shortened as much as possible to meet the use requirements of the narrow space of the special vehicle.

[0006] The technical solution adopted by the centralized symmetrical two-stage supercharger system of a diesel engine of the present invention is:

[0007] A diesel engine centralized symmetrical two-stage supercharger system, comprising two two-stage superchargers arranged on the diesel engine, characterized in that: the two two-stage superchargers are symmetrically arranged above a flywheel housing, the low-stage supercharger in each two-stage supercharger is located above the high-stage supercharger, the rear side of each low-stage supercharger is provided with an exhaust gas outlet connected to the corresponding low-stage supercharger, the front side of each low-stage supercharger is provided with an air inlet connected to the corresponding low-stage supercharger, a side close to the two high-stage superchargers is provided with an exhaust gas inlet facing downward, and the rear side of each high-stage supercharger is provided with an exhaust gas outlet extending upward;

[0008] Two low-stage superchargers, two high-stage superchargers, two exhaust gas outlets, two air inlets, two exhaust gas inlets and two exhaust pipes are respectively located on the same plane and are arranged symmetrically with respect to the crankshaft axis of the diesel engine.

[0009] A further improvement of the technical solution of the present invention is that each high-stage supercharger is located above the air outlet of the diesel engine flywheel housing, and the exhaust gas inlet of each high-stage supercharger is connected to the corresponding diesel engine flywheel housing air outlet through a pulse seat; at the same time, a support frame is arranged between the two two-stage superchargers and the flywheel housing.

[0010] A further improvement of the above technical solution of the present invention is that an exhaust passage is provided in the pulse seat.

[0011] A further improvement of the technical solution of the present invention is that the high-stage supercharger in each two-stage supercharger is connected to the corresponding low-stage supercharger through an interstage pipe.

[0012] A further improvement of the technical solution of the present invention is that each high-level supercharger is provided with an air release valve controlled by an electronically controlled actuator.

[0013] A further improvement of the above technical solution of the present invention is that each electronically controlled actuator is located below the corresponding high-stage supercharger, and the two electronically controlled actuators are located on the left and right sides of the flywheel housing.

[0014] A further improvement of the technical solution of the present invention is that the air inlet of each high-stage supercharger is connected to the air filter through a connecting pipe, the air outlet pipe of each high-stage supercharger is connected to the intercooler, and the exhaust gas outlet of each low-stage supercharger is connected to the exhaust pipe.

[0015] A further improvement of the technical solution of the present invention is that the exhaust gas discharged by the diesel engine is discharged through the exhaust gas inlet, the high-stage supercharger, the low-stage supercharger and the exhaust gas outlet in sequence.

[0016] A further improvement of the technical solution of the present invention is that fresh air enters the diesel engine through the air inlet, the low-stage supercharger, the high-stage supercharger and the air outlet pipe in sequence.

[0017] Due to the adoption of the above technical solution, the technical advances achieved by the present invention include:

[0018] The present invention realizes a supercharger pressure ratio of ≥4.0 through a two-stage supercharging method, and adopts an adaptive electronic control adjustment system with an integrated bleed valve. The electronic control actuator can be used to accurately adjust the bleed valve integrated in the advanced turbine box to determine the optimal intake pressure, so that the diesel engine can meet the reliable, stable and powerful output power requirements at an altitude of 5000m.

[0019] Under the condition that the width of the power compartment of the special vehicle is limited, the present invention adopts two two-stage superchargers in a fixed space and performs an integrated design symmetrically along the axis, thereby shortening the overall width of the diesel engine as much as possible. At the same time, since the air inlet and exhaust outlet of the two-stage supercharger are located at the front and rear sides of the upper low-stage supercharger, it is convenient to install the two-stage supercharger and reduce the parts of the auxiliary system, so that the present invention meets the use requirements of the narrow space of the special vehicle.

[0020] In the present invention, since the low-stage supercharger is located above the high-stage supercharger, and the two low-stage superchargers, the two high-stage superchargers, the two exhaust gas outlets, the two air inlets, the two exhaust gas inlets and the two exhaust pipes are respectively located on the same plane, when the two-stage supercharger of the present invention is mounted on a diesel engine, compared with the traditional arrangement, the overall length of the diesel engine can be shortened, thereby enabling the present invention to further meet the use requirements of special vehicles in narrow spaces. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of a centralized symmetrical two-stage supercharger system for a diesel engine of the present invention;

[0022] Figure 2 It is a structural schematic diagram of a diesel engine centralized symmetrical two-stage supercharger system of the present invention when it is installed on a diesel engine;

[0023] Figure 3 The present invention is a schematic diagram of the layout structure of a centralized symmetrical two-stage supercharger system for a diesel engine.

[0024] In the attached figure: 1, two-stage supercharger; 11, low-stage supercharger; 12, high-stage supercharger; 13, interstage pipe; 14, exhaust gas outlet; 15, air inlet; 16, exhaust gas inlet; 17, exhaust pipe;

[0025] 2. Flywheel housing; 3. Pulse seat; 31. Exhaust channel;

[0026] 4. Support frame; 5. Electronically controlled actuator; 6. Air filter; 7. Connecting pipe; 8. Intercooler; 9. Exhaust pipe. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the present invention more clear, the present invention is further described in detail below in combination with specific implementation methods and with reference to the accompanying drawings. In the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0028] First reference Figure 1 It can be seen that the present invention includes two two-stage superchargers 1, which are located above the diesel engine flywheel housing 2 and are symmetrically arranged with the axis of the diesel engine crankshaft as the center. Each two-stage supercharger 1 includes a high-level supercharger 12 located above the flywheel housing 2 and connected to the flywheel housing 2, and a low-level supercharger 11 is arranged above the high-level supercharger 12. At the same time, the two high-level superchargers 12 and the two low-level superchargers 11 are symmetrically arranged with the axis of the diesel engine crankshaft as the center. In this embodiment, the low-level supercharger 11 is located near the axis of the diesel engine crankshaft, so that the gap between the two low-level superchargers 11 is smaller than the gap between the two high-level superchargers 12, and each low-level supercharger 11 is connected to the corresponding high-level supercharger 12 through an interstage pipe 13. The present invention can achieve a supercharger pressure ratio of ≥4.0 through a two-stage supercharging method.

[0029] In this embodiment, an exhaust gas outlet 14 for exhausting exhaust gas is provided on one side of each low-stage supercharger 11, and an air inlet 15 for inputting fresh air is also provided on the other side of the low-stage supercharger 11, and the air inlet 15 is opened in the opposite direction to the exhaust gas outlet 14; at the same time, in this embodiment, an exhaust gas inlet 16 with an opening direction facing downward is provided on the side close to each other of the two high-stage superchargers 12, and an exhaust gas outlet pipe 17 extending upward is connected to one side of each supercharger. The above two exhaust gas outlets 14, two air inlets 15, two exhaust gas inlets 16, and two exhaust gas outlet pipes 17 are symmetrically arranged with the axis of the diesel engine crankshaft as the center. The present invention adopts two two-stage superchargers 1 in a fixed space and performs an integrated design symmetrically along the axis, thereby shortening the overall width of the diesel engine as much as possible, and can optimize the overall width of the diesel engine from the original 1300mm to 970mm. At the same time, since the air inlet 15 and the exhaust gas outlet 14 of the two-stage supercharger 1 are located at the front and rear sides of the upper low-stage supercharger 11, it is convenient to install the two-stage supercharger 1 and reduce the parts of the auxiliary system, so that the present invention meets the use requirements of special vehicles in narrow spaces.

[0030] At the same time, in the present invention, since the low-stage supercharger 11 is located above the high-stage supercharger 12, and the two low-stage superchargers 11, the two high-stage superchargers 12, the two exhaust gas outlets 14, the two air inlets 15, the two exhaust gas inlets 16 and the two exhaust pipes 17 are respectively located on the same plane, when the two-stage supercharger 1 of the present invention is installed on the diesel engine, compared with the traditional arrangement, the overall length of the diesel engine can be shortened, so that the present invention can further meet the use requirements of the narrow space of special vehicles.

[0031] Continue to refer Figure 1 In this embodiment, each high-level supercharger 12 is provided with a bleed valve controlled by a common electronically controlled actuator 5. Specifically, the electronically controlled actuator 5 is located below the corresponding high-level supercharger 12, and two electronically controlled actuators 5 are located on the left and right sides of the flywheel housing 2 and are symmetrically arranged with the axis of the diesel engine crankshaft as the center. The present invention uses the electronically controlled actuator 5 to accurately adjust the bleed valve integrated in the high-level turbine box, determine the optimal intake pressure, and enable the diesel engine to meet the reliable, stable and powerful output power under the condition of 5000m above sea level.

[0032] In this embodiment, the two-stage supercharger 1 is connected to the flywheel housing 2. Figure 2 It can be seen that the high-stage supercharger 12 is located above the flywheel housing 2, and the exhaust gas inlet 16 of the high-stage supercharger 12 is aligned with the air outlet of the flywheel housing 2, and then the high-stage supercharger 12 and the flywheel housing 2 are connected together through the pulse seat 3. An exhaust channel 31 connecting the exhaust gas inlet 16 and the air outlet of the flywheel housing 2 is opened inside the pulse seat 3. In this embodiment, the pulse seat 3 can not only fix the two-stage supercharger 1 and the flywheel housing 2 together, but also serve as an exhaust pipeline, and there is no need to arrange the exhaust pipeline separately; at the same time, in this embodiment, the two two-stage superchargers 1 are also connected to the top of the flywheel housing 2 through the support frame 4. Specifically, the support frame 4 is located in the middle below the two two-stage superchargers 1 and at the top of the flywheel housing 2. In this embodiment, the support frame 4 plays a role of auxiliary support, which can make the two-stage supercharger 1 more firmly fixed on the flywheel housing 2.

[0033] This embodiment is used in specific Figure 3 It can be seen that the air inlets 15 in the two two-stage superchargers 1 are connected to the air filter 6 through the connecting pipe 7. The connecting pipe 7 can use the molded hose commonly used in the prior art. The two air inlets 15 are connected to a connecting pipe 7 arranged in a Y shape; in this embodiment, the air outlet pipes 17 of the two two-stage superchargers 1 are directly connected to the intercooler 8, and the air directly enters the diesel engine intake pipe after being cooled in the intercooler 8; at the same time, in this embodiment, the exhaust gas outlets 14 of the two two-stage superchargers 1 are connected to the same exhaust pipe 9, so that the combustion exhaust gas of the diesel engine is discharged to the muffler or discharged outside the vehicle.

[0034] At the same time, the outer sides of the two-stage supercharger 1 in this embodiment are covered with a heat insulation cover, so that the heat management in the vehicle power compartment is more convenient.

[0035] The working principle of the centralized symmetrical two-stage supercharger system for diesel engines of this embodiment is as follows: firstly, the present invention is installed on the flywheel housing 2 and connected with the air filter 6, the intercooler 8 and the exhaust pipe 9.

[0036] When this embodiment is used, the exhaust gas discharged by the diesel engine enters the high-pressure supercharger from the exhaust gas inlet 16 of the two two-stage superchargers 1 respectively, and the exhaust gas first passes through the exhaust gas turbine of the high-stage supercharger 12, thereby providing power for the high-stage supercharger 12 to compress the air, and then the exhaust gas enters the exhaust gas turbine of the low-stage supercharger 11, thereby providing power for the low-stage supercharger 11 to compress the air, and finally the exhaust gas is discharged from the exhaust gas outlet 14 to the exhaust pipe 9, so that the combustion exhaust gas of the diesel engine is discharged to the muffler or discharged outside the vehicle.

[0037] At the same time, fresh air is filtered by the air filter 6 and enters the low-stage supercharger 11 through the air inlet 15. The fresh air is first supercharged by the compressor of the low-stage supercharger 11, and then enters the high-stage supercharger 12. It is supercharged twice by the compressor of the high-stage supercharger 12. The supercharged air is discharged from the outlet pipe 17 to the intercooler 8, thereby supplying air to the diesel engine.

[0038] In the above embodiment, the present invention provides a centralized symmetrical two-stage supercharger system for a diesel engine. Under the condition that the width space of the power compartment of a special vehicle is limited, the present invention adopts two two-stage superchargers in a fixed space and performs an integrated design symmetrically along the axis, thereby shortening the overall width of the diesel engine as much as possible. At the same time, since the air inlet and exhaust gas outlet of the two-stage supercharger are located at the front and rear sides of the upper low-stage supercharger, it is convenient to install the two-stage supercharger and reduce the parts of the auxiliary system, so that the present invention meets the use requirements of the narrow space of the special vehicle; in the present invention, since the low-stage supercharger is located above the high-stage supercharger, and the two low-stage superchargers, two high-stage superchargers, two exhaust gas outlets, two air inlets, two exhaust gas inlets and two exhaust pipes are respectively located on the same plane, when the two-stage supercharger of the present invention is installed on the diesel engine, compared with the traditional arrangement, the overall length of the diesel engine can be shortened, thereby further meeting the use requirements of the narrow space of the special vehicle.

[0039] The above-described embodiments are merely descriptions of preferred implementations of the present invention, and are not intended to limit the concept and scope of the present invention. Without departing from the design concept of the present invention, various modifications and improvements made by ordinary persons in the art to the technical solution of the present invention should fall within the protection scope of the present invention, and the technical contents for which protection is sought in the present invention have been fully recorded in the claims.

Claims

1. A diesel engine centralized symmetrical two-stage supercharger system, comprising two two-stage superchargers (1) arranged on the diesel engine, characterized in that: Two two-stage superchargers (1) are symmetrically arranged above a flywheel housing (2); a low-stage supercharger (11) in each two-stage supercharger (1) is located above a high-stage supercharger (12); a rear side of each low-stage supercharger (11) is provided with an exhaust gas outlet (14) connected to the corresponding low-stage supercharger (11); a front side of each low-stage supercharger (11) is provided with an air inlet (15) connected to the corresponding low-stage supercharger (11); a side of the two high-stage superchargers (12) adjacent to each other is provided with an exhaust gas inlet (16) facing downwards; and a rear side of each high-stage supercharger (12) is provided with an exhaust gas outlet pipe (17) extending upwards; Two low-stage superchargers (11), two high-stage superchargers (12), two exhaust gas outlets (14), two air inlets (15), two exhaust gas inlets (16) and two exhaust pipes (17) are respectively located on the same plane and are arranged symmetrically with respect to the crankshaft axis of the diesel engine.

2. A diesel engine centralized symmetrical two-stage supercharger system according to claim 1, characterized in that: Each high-stage supercharger (12) is located above the air outlet of the diesel engine flywheel housing (2), and the exhaust gas inlet (16) of each high-stage supercharger (12) is connected to the corresponding diesel engine flywheel housing (2) air outlet through a pulse seat (3); at the same time, a support frame (4) is arranged between the two two-stage superchargers (1) and the flywheel housing (2).

3. A diesel engine centralized symmetrical two-stage supercharger system according to claim 2, characterized in that: An exhaust passage (31) is provided in the pulse seat (3).

4. A diesel engine centralized symmetrical two-stage supercharger system according to claim 1, characterized in that: The high-stage supercharger (12) in each two-stage supercharger (1) is connected to the corresponding low-stage supercharger (11) through an interstage pipe (13).

5. A diesel engine centralized symmetrical two-stage supercharger system according to claim 1, characterized in that: Each high-stage supercharger (12) is provided with an air release valve controlled by an electronically controlled actuator (5).

6. A diesel engine centralized symmetrical two-stage supercharger system according to claim 5, characterized in that: Each electronically controlled actuator (5) is located below the corresponding high-stage supercharger (12), and the two electronically controlled actuators (5) are located on the left and right sides of the flywheel housing (2).

7. A diesel engine centralized symmetrical two-stage supercharger system according to claim 1, characterized in that: The air inlet (15) of each high-stage supercharger (12) is connected to the air filter (6) through a connecting pipe (7), the air outlet pipe (17) of each high-stage supercharger (12) is connected to the intercooler (8), and the exhaust gas outlet (14) of each low-stage supercharger (11) is connected to the exhaust pipe (9).

8. A diesel engine centralized symmetrical two-stage supercharger system according to any one of claims 1 to 7, characterized in that: The exhaust gas discharged from the diesel engine is discharged through the exhaust gas inlet (16), the high-stage supercharger (12), the low-stage supercharger (11) and the exhaust gas outlet (14) in sequence.

9. A diesel engine centralized symmetrical two-stage supercharger system according to any one of claims 1 to 7, characterized in that: Fresh air enters the diesel engine through the air inlet (15), the low-stage supercharger (11), the high-stage supercharger (12) and the air outlet pipe (17) in sequence.

Images