Exhaust pipe and vehicle

Abstract

The utility model relates to an exhaust pipe and a vehicle, and belongs to the field of vehicle accessories. According to the technical scheme, the exhaust pipe comprises a front-section pipe body and a rear-section pipe body which are sequentially arranged in the gas flowing direction, the front-section pipe body and the rear-section pipe body are connected through a corrugated pipe, an extension pipe is further arranged at the rear end of the front-section pipe body, and the extension pipe extends into the corrugated pipe. The corrugated pipe has the advantages that the front section of the pipe body is lengthened, the extension pipe shields the inner surface of the corrugated pipe in the corrugated pipe, urea and tail gas flow through the extension pipe and do not reach the inner surface of the corrugated pipe, accumulation of the urea in a corrugated gap of the corrugated pipe is greatly reduced, and meanwhile the movable compensation effect of the corrugated pipe is not affected.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of vehicle accessories, in particular to an exhaust pipe and a vehicle. BACKGROUND

[0002] In heavy vehicles, most of the vehicles are powered by diesel, and the combustion of diesel in the engine will produce harmful gases such as carbon monoxide, nitrogen oxides and hydrocarbons. Among them, urea needs to be used to treat nitrogen oxides, and the vehicle is equipped with a urea tank and injects into the exhaust gas through a pipeline and a nozzle, and urea decomposes to produce ammonia gas at high temperature, which reacts with nitrogen oxides under the action of the catalyst in the aftertreatment device to generate nitrogen and water.

[0003] In the exhaust system of the vehicle, the engine is connected to the aftertreatment device through the exhaust pipe, and the exhaust gas temperature in the exhaust pipe is higher than that in the aftertreatment device, so the urea nozzle mounting seat is installed on the exhaust pipe in some vehicle models.

[0004] On the other hand, the engine and the aftertreatment device are both installed on the frame, the engine itself vibrates, the aftertreatment device vibrates with the frame, and the two have different vibration frequencies and amplitudes. The exhaust pipe is connected between the two, so the exhaust pipe is usually a segmented structure, and the multiple segments are connected by bellows. The bellows compensate for the different vibration characteristics of the engine and the aftertreatment device to avoid damage to the exhaust pipe.

[0005] As can be seen from the above description, in the above structure, the urea sprayed by the urea nozzle mounting seat is easy to accumulate and crystallize in the corrugated seam of the bellows, which not only causes waste of urea, but also causes corrosion of the bellows due to long-term accumulation of urea, resulting in damage and leakage. SUMMARY

[0006] To solve the above problems, the utility model adopts the technical scheme that an exhaust pipe comprises a front pipe body and a rear pipe body arranged in sequence along the gas flow direction, the front pipe body and the rear pipe body are connected by a bellows, and the rear end of the front pipe body is further provided with an extension pipe which extends into the bellows. The present application prolongs the front pipe body, so that the extension pipe blocks the inner surface of the bellows inside the bellows. The urea and exhaust gas flow through the extension pipe and do not reach the inner surface of the bellows, greatly reducing the accumulation of urea in the corrugated seam of the bellows, while not affecting the active compensation effect of the bellows.

[0007] Preferably, the front pipe body comprises a first pipe segment and a second pipe segment connected in sequence along the gas flow direction, the first pipe segment and the second pipe segment are arranged at an angle, and a urea nozzle mounting seat is arranged at the angle. The urea nozzle mounting seat makes the spray direction of the installed urea nozzle face the second pipe segment. The spray direction of the urea is consistent with the flow direction of the exhaust gas, which facilitates the diffusion and flow of the urea.

[0008] Preferably, the first pipe section and the second pipe section are integrated.

[0009] Preferably, the diameter of the front pipe body is larger than the diameter of the extension pipe, and the front pipe body and the extension pipe are smoothly connected, and the front end of the bellows is connected to the transition connection between the front pipe body and the extension pipe.

[0010] Preferably, the front pipe body and the extension pipe are integrated.

[0011] Preferably, the outer part of the first pipe section of the front pipe body is covered with a heat preservation layer.

[0012] Preferably, the second pipe section is provided with a temperature sensor mounting seat.

[0013] Preferably, the front end of the front pipe body and the rear end of the rear pipe body are respectively provided with a connecting flange.

[0014] Preferably, the end face of the connecting flange is further provided with a positioning boss.

[0015] In another aspect, the utility model also provides a kind of vehicle, comprising the exhaust pipe described above, the front end of the front pipe body is connected with upstream exhaust pipe, and the rear end of the rear pipe body is connected with rear processor.

[0016] Through the above technical scheme, the advantages of the utility model are as follows: the front pipe body of the exhaust pipe is lengthened, and the extension pipe covers the inside of the bellows, while retaining the vibration compensation effect of the bellows, the exhaust gas containing urea passes through the extension pipe without contacting the inner wall of the bellows, reducing the accumulation of urea in the bellows, thereby reducing the waste of urea and avoiding the corrosion of the bellows by urea; the extension pipe is designed with a reduced diameter relative to the front pipe body, reducing the interference with the bellows outside the extension pipe, and the smooth transition between the extension pipe and the front pipe body eliminates the internal corner angle, further avoiding the accumulation of urea; furthermore, the vehicle provided by the present scheme has higher urea utilization rate and longer service life of the exhaust system.

[0017] The utility model provides an exhaust pipe with a more perfect structure and less urea accumulation. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to make the technical scheme of the utility model more apparent and easy to understand, the following will be a brief introduction to the drawings needed to be used in the description, obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to these drawings without creative labor.

[0019] Figure 1 It is the structural schematic diagram of the embodiment one of the utility model.

[0020] Figure 2 It is the structural schematic diagram of the extension pipe in the embodiment one of the utility model.

[0021] Figure 3 It is the structural schematic diagram of the exhaust pipe in the embodiment two of the utility model.

[0022] Main drawing mark explanation

[0023] 1. The front pipe body, 1-1. The first pipe section, 1-2. The second pipe section, 2. The rear pipe body, 3. The bellows, 4. The extension pipe, 5. The urea nozzle mounting seat, 6. The temperature sensor mounting seat, 7. The connecting flange, 8. The positioning boss, 9. The upstream exhaust pipe, 10. The postprocessor, 11. The urea nozzle, 12. The temperature sensor. Specific implementation

[0024] In order to make the purpose, feature, advantage of the utility model more apparent and easy to understand, the following will be a clear, complete description to the technical scheme in the utility model by combining the drawings in the specific embodiment, obviously, the following described embodiment is only a part of the embodiment of the utility model, rather than all the embodiments. Based on the embodiment in the patent, all other embodiments obtained by those skilled in the art without creative labor are within the scope of the patent protection.

[0025] Embodiment one

[0026] As Figure 1 Shown, the embodiment provides a kind of exhaust pipe, similar to existing exhaust pipe, including the front pipe body 1 and rear pipe body 2 sequentially arranged along gas flow direction, front pipe body 1 and rear pipe body 2 are connected by bellows 3, the front end of front pipe body 1 and the rear end of rear pipe body 2 are respectively equipped with connecting flange 7, the end face of the connecting flange is also equipped with positioning boss 8, wherein, front pipe body 1 is used to directly or indirectly connect vehicle engine, rear pipe body 2 is used to directly or indirectly connect the postprocessor of vehicle, it can be understood, front pipe body 1 vibrates with engine, rear pipe body 2 vibrates with postprocessor, the vibration amplitude and frequency of two are different, so there is subtle difference in the position in vibration, the expansion and contortion of bellows 3 can compensate the position difference between front pipe body and rear pipe body.

[0027] In this embodiment, the front section pipe includes a first pipe section 1-1 and a second pipe section 1-2 connected end to end along the gas flow direction. The first pipe section and the second pipe section are an integral structure. The first pipe section 1-1 and the second pipe section 1-2 are arranged at an angle. A urea nozzle mounting seat 5 is provided at the angle. The urea nozzle mounting seat 5 is used to install a urea nozzle. The urea nozzle mounting seat 5 is set in the form of a plug hole. The insertion direction is along the direction of the second pipe section. Thus, the spray direction of the installed urea nozzle is towards the inside of the second pipe section 1-2. At least the outside of the first pipe section 1-1 is covered with a heat insulation layer on the front section pipe 1 to improve the heat insulation effect of the exhaust pipe. A temperature sensor mounting seat 6 is also provided on the second pipe section to install a temperature sensor to monitor the exhaust gas temperature.

[0028] Based on the above structure, this embodiment provides an extension pipe at the rear end of the first pipe section 1, such as... Figure 2 As shown, the extension pipe 4 is connected to the rear end of the second pipe section 1-2 and can be integrally formed with the second pipe section, that is, the extension pipe 4 and the first pipe section 1 are integrally formed. The diameter of the front pipe body 1 is larger than the diameter of the extension pipe 4, and there is a smooth transition between the front pipe body 1 and the extension pipe 4. The front end of the corrugated pipe 3 is connected to the transition joint between the front pipe body 1 and the extension pipe 4. Figure 2 As can be seen, inside the bellows 3, the extension pipe 4 blocks the inner surface of the bellows 3. The exhaust gas containing urea enters the second pipe section through the extension pipe 4, contacting the inner wall of the extension pipe 4 but not the inner wall of the bellows 3. This prevents urea from entering the corrugated gaps of the bellows and avoids urea accumulation in those gaps. Simultaneously, the bellows 3 employs a reduced diameter design. Figure 2 As can be seen, there is a certain distance between the inner wall of the corrugated pipe 3 and the outer wall of the extension pipe. This distance allows the corrugated pipe to maintain a certain range of free movement, retaining its compensating function. The diameter reduction is smooth, eliminating internal turning corners and further reducing urea accumulation.

[0029] Example 2

[0030] This embodiment further provides a vehicle that uses the exhaust pipe provided in Embodiment 1, such as... Figure 3 As shown, the front end of the front section pipe 1 is connected to the upstream exhaust pipe 9, the rear end of the rear section pipe 2 is connected to the after-processor 10, the urea nozzle mounting seat 5 is equipped with a urea nozzle 11, and the temperature sensor mounting seat is equipped with a temperature sensor 12.

[0031] It can be seen from the above examples that the beneficial effects of the utility model lie in that the front section pipe body of the exhaust pipe is lengthened, the extension pipe is covered in the internal part of the bellows pipe, the tail gas containing urea passes through the extension pipe without contacting the internal wall of the bellows pipe while the vibration compensation effect of the bellows pipe is reserved, the accumulation of urea in the bellows pipe is reduced, the waste of urea is further reduced, and the urea corrosion of the bellows pipe is avoided; the extension pipe is designed with a reduced diameter relative to the front section pipe body, the interference with the externally sleeved bellows pipe is reduced, the extension pipe and the front section pipe body are smoothly connected, the internal turning angle is eliminated, and the accumulation of urea is further avoided; furthermore, the utilization rate of urea of the vehicle is higher, and the service life of the exhaust system is longer.

[0032] The above description of disclosed embodiments enables one skilled in the art to make or use the utility model. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be applied to other embodiments without departing from the spirit or scope of the utility model. Thus, the utility model is not to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An exhaust pipe comprising a front pipe body and a rear pipe body arranged in this order in a gas flow direction, the front pipe body and the rear pipe body being connected by a bellows, characterized in that, The rear end of the front section pipe body is further provided with an extension pipe which extends into the bellows.

2. The exhaust pipe according to claim 1, characterized by The front section pipe body comprises a first pipe section and a second pipe section which are connected head to tail along the gas flow direction, and the first pipe section and the second pipe section are arranged at an included angle, and a urea nozzle mounting seat is arranged at the included angle, and the urea nozzle mounting seat makes the spray direction of the installed urea nozzle face the second pipe section.

3. The exhaust pipe according to claim 2, characterized by The first pipe section and the second pipe section are an integral structure.

4. The exhaust pipe according to claim 1, characterized by The diameter of the front section pipe body is larger than the diameter of the extension pipe, and the front section pipe body and the extension pipe are smoothly connected, and the front end of the bellows is connected to the transition connection position of the front section pipe body and the extension pipe.

5. The exhaust pipe according to claim 1, characterized by The front section pipe body and the extension pipe are an integral structure.

6. The exhaust pipe according to claim 2, characterized by The outer part of at least the first pipe section of the front section pipe body is covered with a heat preservation layer.

7. The exhaust pipe according to claim 2, characterized by A temperature sensor mounting seat is arranged on the second pipe section.

8. The exhaust pipe according to claim 1, characterized by The front end of the front section pipe body and the rear end of the rear section pipe body are respectively provided with a connecting flange.

9. The exhaust pipe according to claim 8, characterized by A positioning boss is further arranged on the end face of the connecting flange.

10. A vehicle characterized by comprising: The exhaust pipe comprises the front section pipe body as claimed in any one of claims 1-9, the front end of the front section pipe body is connected with an upstream exhaust pipe, and the rear end of the rear section pipe body is connected with an aftertreatment device.

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