Smoke exhaust pipe structure of diesel engine

Abstract

The invention relates to a smoke exhaust pipe structure of a diesel engine. The smoke exhaust pipe structure comprises a turbine box, a corrugated pipe, a smoke exhaust pipe, a smoke exhaust pipe auxiliary seat, a flexible thin plate, a belleville spring combination pair and a fixed base, an inlet of the smoke exhaust pipe is fixedly connected with the turbine box through a corrugated pipe; the smoke exhaust pipe auxiliary base is fixed to a pipe opening of the inlet end of the smoke exhaust pipe. The limiting support is installed on the smoke exhaust pipe auxiliary base. The smoke exhaust pipe auxiliary seat, the flexible thin plate and the belleville spring combination pair are sequentially connected in series and fixed through high-temperature bolts. The displacement sensor is fixed to the flexible thin plate, and whether the corrugated pipe is in a normal working state or not is judged by monitoring the displacement of the thin plate in real time. The device is simple in structure, convenient to implement, economical, high in installability and long in service life. Lightweight design and flexible supporting of the pipeline are achieved, the problems of pipeline cracking, sealing failure and the like caused by over-positioning and large vibration in the service process are solved, the reliability of the smoke exhaust pipe system is improved, and the fault occurrence probability is reduced.

Description

Technical Field

[0001] The invention belongs to the field of diesel engines, in particular to the technical field of high-power exhaust gas turbocharged diesel engines, and specifically relates to a diesel engine low-rigidity and low-inertia exhaust pipe structure, in particular to a low-rigidity and low-inertia exhaust pipe structure with an alarm device. Background Art

[0002] For high-power multi-cylinder exhaust gas turbocharged diesel engines, two parallel superchargers are often used to obtain a higher intake volume, thereby increasing the power of the diesel engine. The supercharger is usually connected to the vehicle body with a cast iron exhaust pipe, and fixed with a traditional rigid support. The survey results show that for cast exhaust pipes, the conventional casting wall thickness is 5 to 6 mm, and the one with a higher level of craftsmanship can reach 3.5 mm. However, since the diameter of the exhaust pipe of a high-power diesel engine is generally larger, the weight of the cast pipe is difficult to control, resulting in a large weight, high rigidity, and large inertia of the entire system.

[0003] For diesel engines of high-power special equipment, most models have unbalanced inertia force. At the same time, due to the bad operating conditions, the whole machine vibrates violently. During the service process, the vibration of the whole machine or the body is transmitted to the exhaust pipe, causing cracks in the exhaust pipe, broken brackets, loose bolts, failure of connectors, etc., affecting the performance of the whole machine. Therefore, designing an exhaust pipe system with weak stiffness, small inertia and high fatigue life is of great significance to improve the reliability of the whole machine. Summary of the invention

[0004] Aiming at the problems of high rigidity, large inertia, difficult support, frequent failures and short service life of the exhaust pipe of a high-power turbocharged diesel engine, a diesel engine low-rigidity and low-inertia exhaust pipe structure is provided. While ensuring reliable support for the exhaust pipe, the structure has sufficient flexibility to significantly reduce the vibration of the exhaust pipe. At the same time, it is equipped with an alarm device to improve system reliability.

[0005] In order to solve the above technical problems, the present invention provides a diesel engine exhaust pipe structure, which is characterized by comprising a turbine case, a bellows 4, an exhaust pipe 5, an exhaust pipe sub-base 6, a flexible thin plate, a disc spring combination pair and a fixed base;

[0006] The inlet of the exhaust pipe 5 is fixedly connected to the turbine box through the bellows 4; the exhaust pipe sub-base is fixed at the pipe opening at the inlet end of the exhaust pipe 5; the limit bracket is installed on the exhaust pipe sub-base 6;

[0007] The smoke exhaust pipe sub-base 6, the flexible thin plate 9, and the disc spring combination pair 11 are connected in series in sequence and fixed by high-temperature bolts; the lower end of the flexible thin plate 9 is fixedly connected to the fixed base; the displacement sensor 17 is fixed on the flexible thin plate 9, and determines whether the corrugated pipe is in a normal working state by real-time monitoring of the displacement of the thin plate.

[0008] Beneficial effects:

[0009] 1. The exhaust pipe 5 is a thin-walled stainless steel plate welded structure with a recommended wall thickness of 1.5 mm. Compared with the existing casting solution, the weight is reduced by 35% to 60%, which greatly reduces the weight of the pipeline and thus reduces the system inertia;

[0010] 2. The left turbine case 1, the right turbine case 2 and the exhaust pipe 5 are connected by a bellows, which has compensatory properties and is mainly used to compensate for thermal deformation and vibration deformation;

[0011] 3. The limit bracket is a flexible structure, and the connection with the exhaust pipe sub-base uses a butterfly spring device to withstand large loads with small deformation;

[0012] Fourth, the fixed base 16 is a rigid structure, and the structure can be flexibly adjusted according to actual conditions;

[0013] 5. A double-layer flexible thin plate 9 is installed between the fixed base and the smoke exhaust pipe sub-base. The single layer thickness is 1mm. The installation surface of the thin plate is perpendicular to the axial direction of the corrugated pipe 4. When the corrugated pipe is deformed, the thin plate deforms at the same time, reducing the rigidity of the bracket and achieving a vibration reduction effect.

[0014] 6. The displacement sensor 17 is installed on the thin plate, and determines whether the deformation of the bellows exceeds the maximum compensation amount by real-time monitoring of the displacement of the thin plate. When the maximum compensation amount is exceeded, the controller 18 issues an alarm to indicate that the bellows is at risk of cracking;

[0015] 7. The direction and outlet of the exhaust pipe 5 can be flexibly adjusted according to the layout of the supercharger and the requirements of the vehicle, but the axial direction of the bellows must always be kept vertical to the surface of the flexible thin plate.

[0016] Compared with the prior art, the smoke exhaust pipe and supporting structure described in the present invention greatly reduce the weight of the system and achieve weak stiffness and small inertia. At the same time, an alarm device is used to monitor the state of the bellows to avoid the associated failure caused by sudden cracking of the bellows, thereby improving the reliability of the system. The structure is simple and is conducive to engineering applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall scheme of the present invention;

[0018] Figure 2 This is a schematic diagram of the structure of the limiting bracket of the present invention;

[0019] Figure 3 This is a schematic diagram of the smoke exhaust pipe and the auxiliary seat structure of the present invention;

[0020] Among them: 1. Left turbine box 2. Right turbine box 3. Clamp 4. Bellows 5. Exhaust pipe 6. Exhaust pipe sub-seat; 7. High-temperature bolts 8. Small-hole gaskets 9. Flexible thin plates 10. Large-hole gaskets 11. Disc spring combination pair 12. High-temperature nuts 13. Guide sleeves 14. Bolts 15. Nuts 16. Fixed base 17. Displacement sensor 18. Alarm. DETAILED DESCRIPTION

[0021] In order to make the purpose, content and advantages of the present invention more clear, the specific implementation methods of the present invention are further described in detail below.

[0022] The invention proposes a diesel engine low-rigidity and low-inertia exhaust pipe structure, which is composed of a left turbine case 1, a right turbine case 2, a clamp 3, a bellows 4, an exhaust pipe 5, an exhaust pipe sub-seat 6, a limit bracket, a displacement sensor 17, and an alarm 18;

[0023] The exhaust pipe 5 is a thin-walled steel plate welded structure with a wall thickness of only 1.5 mm. The weight can be reduced by 35%-60% compared with the traditional casting process, greatly reducing the system inertia;

[0024] The two inlets of the exhaust pipe 5 are fixedly connected to the left turbine box 1 and the right turbine box 2 respectively through the clamp 3 and the bellows 4. The bellows is a commonly used pipeline expansion joint. In this structure, it is mainly used to absorb the thermal deformation of the pipeline when it runs at high temperature, and at the same time increase the elastic deformation capacity of the pipeline to achieve a vibration reduction effect;

[0025] The exhaust pipe sub-base 6 is a sheet metal part with a thickness of 3 mm. Figure 3 , welded at the pipe opening of the connection end of the exhaust pipe 5 and the corrugated pipe 4, the installation plane of the exhaust pipe sub-base is perpendicular to the axial direction of the corrugated pipe; the limit bracket is installed on the exhaust pipe sub-base 6;

[0026] The high temperature bolt 7, small hole gasket 8, flexible thin plate 9, large hole gasket 10, disc spring combination pair 11, high temperature nut 12, guide sleeve 13, bolt 14, nut 15, fixed base 16 constitute a limit bracket, which plays the role of supporting the exhaust pipe and limiting the bellows;

[0027] The high temperature bolt 7, small hole gasket 8, smoke exhaust pipe sub-seat 6, flexible thin plate 9, large hole gasket 10, disc spring combination pair 11, small hole gasket 8, and high temperature nut 12 are sequentially connected in series; the guide sleeve 13 is installed in the disc spring combination pair 11, sleeved on the outside of the high temperature bolt 7, and located between the two small hole gaskets.

[0028] After the disc spring combination pair 11 is subjected to the dynamic vibration load acting in the axial direction, it can store a certain potential energy as a live load to play a role in buffering and vibration reduction. The number of disc spring combination pairs 11 can be flexibly adjusted according to the vibration intensity of the use environment to achieve the optimal vibration matching structure. The design reference standard of the disc spring is: "GB / T 1972-2005 Disc Spring";

[0029] The butterfly spring assembly pair 11 is provided with a guide sleeve 13 to prevent the spring sheet from sliding laterally when loaded. A certain gap is left between the disc and the guide sleeve to release the spring deformation. The surface hardness of the guide sleeve is greater than that of the disc to prevent the disc from scratching the guide sleeve, thereby ensuring the reliability of installation.

[0030] The flexible sheet 9 is installed in two overlapping pieces, and the installation plane should be perpendicular to the axial direction of the bellows and butterfly spring combination. When the butterfly spring is compressed and rebounded, the flexible sheet deforms in coordination, effectively compensating for the vibration displacement, so that the stress at the installation position can be released, and there will be no problems of cracking of parts or sealing failure caused by stress concentration, especially increasing the service life of the bellows and improving the reliability of the system. At the same time, there is no need to use a bulky and complex bracket system, so as to achieve lightweight.

[0031] The lower end of the flexible sheet 9 is connected to the fixed base 16 by nuts and bolts. The shape of the bottom plate of the fixed base can be flexibly designed according to the space constraints of the actual supporting position to achieve fixation.

[0032] The displacement sensor 17 is fixed on the flexible thin plate 9 and connected to the alarm 18. It determines whether the bellows is in a normal working state by real-time monitoring of the displacement of the thin plate. When the displacement exceeds the normal compensation amount of the bellows, the alarm 18 sounds an alarm. At this time, the bellows can be stopped and replaced to avoid joint failures caused by sudden cracking of the bellows.

[0033] The present invention has a simple structure, is easy to implement, economical, easy to install, and has a long service life. After the diesel engine exhaust pipe adopts the structure disclosed in the present invention, the pipeline lightweight design and flexible support are realized, and the problems of pipeline cracking and sealing failure caused by over-positioning and large vibration during service are overcome, thereby improving the reliability of the exhaust pipe system and reducing the probability of failure. The present structure can also be extended to the support of other diesel engine bellows connection positions.

[0034] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A diesel engine exhaust pipe structure, characterized in that: It includes a turbine box, a bellows 4, a smoke exhaust pipe 5, a smoke exhaust pipe sub-base 6, a flexible thin plate, a disc spring combination pair and a fixed base; The inlet of the exhaust pipe 5 is fixedly connected to the turbine box through the bellows 4; the exhaust pipe sub-base is fixed at the pipe opening at the inlet end of the exhaust pipe 5; the limit bracket is installed on the exhaust pipe sub-base 6; The smoke exhaust pipe sub-base 6, the flexible thin plate 9, and the disc spring combination pair 11 are connected in series in sequence and fixed by high-temperature bolts; the lower end of the flexible thin plate 9 is fixedly connected to the fixed base; the displacement sensor 17 is fixed on the flexible thin plate 9, and determines whether the corrugated pipe is in a normal working state by real-time monitoring of the displacement of the thin plate.

2. A diesel engine exhaust pipe structure according to claim 1, characterized in that: The smoke exhaust pipe 5 is a thin-walled steel plate welded structure with a wall thickness of only 1.5 mm.

3. A diesel engine exhaust pipe structure according to claim 1, characterized in that: The installation plane of the smoke exhaust pipe sub-seat is perpendicular to the axial direction of the corrugated pipe.

4. A diesel engine exhaust pipe structure according to claim 1, characterized in that: The guide sleeve 13 is installed in the butterfly spring assembly pair 11 and sleeved on the high-temperature bolt 7.

5. The diesel engine exhaust pipe structure according to claim 1, characterized in that: The flexible thin plate 9 is installed in two overlapping pieces, and the installation plane should be perpendicular to the axial direction of the bellows and butterfly spring combination.

6. A diesel engine exhaust pipe structure according to claim 1, characterized in that: The displacement sensor is connected to the alarm 18 .

7. A diesel engine exhaust pipe structure according to claim 6, characterized in that: When the displacement exceeds the normal compensation amount of the bellows, the alarm 18 sounds an alarm.

8. The diesel engine exhaust pipe structure according to claim 1, characterized in that: The number of disc spring combination pairs 11 is adjusted according to the vibration intensity of the use environment.

9. The diesel engine exhaust pipe structure according to claim 1, characterized in that: Gaskets are arranged on the outer side of the smoke exhaust pipe sub-base and on both ends of the disc spring combination.

10. The diesel engine exhaust pipe structure according to claim 1, characterized in that: The bottom plate shape of the fixed base is flexibly designed according to the space constraints of the actual support position.

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