An exhaust system

Abstract

The utility model discloses an exhaust system, specifically at exhaust technology field, including front exhaust pipe, install rear processing device of chassis and with rear processing device exhaust port fixed connection's rear exhaust pipe, and the air inlet of front exhaust pipe's export end is fixedly connected with rear processing device, and front exhaust pipe includes: air inlet pipe, away from the corrugated pipe of rear processing device and with rear processing device air inlet fixed connection's outlet pipe, and air inlet pipe is fixedly connected with outlet pipe through corrugated pipe, and outlet pipe includes: heat -proof inner layer and protective outer layer, the utility model discloses through setting the position of corrugated pipe, reduces exhaust resistance and exhaust whistle, reduces the vibration that corrugated pipe received from the frame, protects front exhaust pipe, eliminates the rear processing device shake problem that corrugated pipe distance rear processing device is too close to cause, through setting the outlet pipe of front exhaust pipe, utilizes the heat -proof inner layer of outlet pipe and carries out heat -proof, improves the heat preservation effect, through setting wire harness support board, prevents the high temperature of rear exhaust pipe and scalds wire harness.

Description

Technical Field

[0001] This utility model relates to the field of exhaust technology, and more specifically, to an exhaust system. Background Technology

[0002] Because the Euro 5 standard imposes stringent requirements on reducing sulfur dioxide (SO2) emissions in exhaust gases, and also requires improvements in the efficiency and lifespan of diesel vehicle exhaust aftertreatment systems (such as diesel particulate filters, DPFs), it is necessary to develop corresponding Euro 5 fuel vehicles to meet the demands of the overseas forklift market for Euro 5 emission standards. This is to significantly reduce pollutant emissions by combining DPFs with selective catalytic reduction (SCR) and other aftertreatment technologies to comply with Euro 5 standards.

[0003] However, in existing exhaust systems, such as... Figure 3 As shown, the bellows is located at the rear of the front exhaust pipe, that is, the bellows is close to the aftertreatment system. The gap between the bellows and the inner wall of the frame is too small, so the vibration transmitted from the frame will damage the front exhaust pipe, thus affecting the exhaust. Therefore, an exhaust system is proposed as a further improvement. Utility Model Content

[0004] In order to overcome the above-mentioned defects of the prior art, the embodiments of this utility model provide an exhaust system to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: an exhaust system, comprising: a front exhaust pipe connected to the engine exhaust port via an exhaust manifold, an aftertreatment device mounted on the chassis, and a rear exhaust pipe fixedly connected to the exhaust port of the aftertreatment device, wherein the outlet end of the front exhaust pipe is fixedly connected to the air inlet of the aftertreatment device.

[0006] The front exhaust pipe includes: an intake pipe connected to the engine exhaust port via an exhaust manifold, a corrugated pipe away from the aftertreatment device, and an exhaust pipe fixedly connected to the intake port of the aftertreatment device, wherein the intake pipe is fixedly connected to the exhaust pipe via the corrugated pipe.

[0007] The vent pipe includes: a heat-insulating inner layer and a protective outer layer.

[0008] Furthermore, a wire harness support plate is fixedly installed at the connection between the exhaust port of the aftertreatment device and the rear exhaust pipe.

[0009] Furthermore, the material of the heat-insulating inner layer is glass fiber.

[0010] Furthermore, the material of the protective outer layer is stainless steel.

[0011] Furthermore, the diameter of the bellows is set to 80-100mm.

[0012] Furthermore, the length of the corrugated pipe is set to 80-100mm.

[0013] The technical effects and advantages of this utility model are as follows:

[0014] Compared with existing technologies, by adjusting the position of the bellows, exhaust resistance and exhaust whistling are reduced, vibrations transmitted from the frame to the bellows are reduced, the front exhaust pipe is protected, and the problem of the aftertreatment device shaking caused by the bellows being too close to the aftertreatment device is eliminated; by setting the exhaust pipe of the front exhaust pipe, the heat insulation inner layer of the exhaust pipe is used for heat insulation, improving the heat preservation effect; by setting the wiring harness support plate, the high temperature of the rear exhaust pipe is prevented from damaging the wiring harness. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0016] Figure 2 This is a schematic diagram of the structure of this utility model located in the vehicle frame.

[0017] Figure 3 This is a schematic diagram of the exhaust system before the improvement.

[0018] The attached diagram is labeled as follows: 100, front exhaust pipe; 110, intake pipe; 120, corrugated pipe; 130, exhaust pipe; 200, aftertreatment device; 300, rear exhaust pipe; 400, wiring harness support plate; 500, engine; 600, frame; 700, counterweight; 800, rubber pad. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0020] An exhaust system includes: a front exhaust pipe 100 connected to an engine exhaust port via an exhaust manifold; an aftertreatment device 200 mounted on a chassis; and a rear exhaust pipe 300 fixedly connected to the exhaust port of the aftertreatment device 200. The outlet end of the front exhaust pipe 100 is fixedly connected to the intake port of the aftertreatment device 200; wherein, as... Figure 2 and Figure 3As shown, the existing exhaust system is located between the engine 500, the frame 600, and the counterweight 700. Due to the height limitation of the counterweight 700, some sections of the existing rear exhaust pipe 300 adopt a welded structure. During the whole vehicle test, the engine aftertreatment DOC and SCR did not achieve good results, and the exhaust resistance and noise failed the test, with some whistling sounds present. Therefore, the rear exhaust pipe 300 can be formed in one piece instead of a welded structure, thus making the exhaust flow smoother.

[0021] As attached Figure 1 and Figure 2 As shown, the front exhaust pipe 100 includes: an intake pipe 110 connected to the exhaust port of the engine 500 via an exhaust manifold, a bellows 120 located away from the aftertreatment device 200, and an exhaust pipe 130 fixedly connected to the intake port of the aftertreatment device 200. The intake pipe 110 is fixedly connected to the exhaust pipe 130 via the bellows 120.

[0022] Among them, as attached Figure 1 , Figure 2 and Figure 3 As shown, the rear treatment support leg 600 on the side of the aftertreatment device 200 is connected to the frame 600 through the rubber pad 800, and the rubber pad 800 is used for cushioning; both ends of the front exhaust pipe 100 are connected by flanges, which facilitates installation and disassembly; and the corrugated pipe 120 on the front exhaust pipe 100 is a flexible connection, which can improve the assemblability.

[0023] Among them, as attached Figure 3 As shown, in the prior art, the bellows 120 is located at the rear of the front exhaust pipe 100, that is, close to the aftertreatment device 200 and the rubber pad 800. In this case, the gap between the bellows 120 and the inner wall of the frame 600 is too small, so vibrations transmitted from the frame 600 will damage the bellows 120, i.e., damage the front exhaust pipe 100, thus affecting exhaust. Furthermore, the bellows 120 being too close to the aftertreatment device 200 will cause the aftertreatment device 200 to shake. Therefore, this invention designs the bellows 120 to be located away from the aftertreatment device 200, as shown in the attached diagram. Figure 1 As shown, the bellows 120 is designed at the front of the front exhaust pipe 100 to reduce exhaust resistance and exhaust whistling, and also to reduce the vibration transmitted from the frame 600 to the bellows 120, thus eliminating the problem of the aftertreatment device 200 shaking due to the bellows 120 being too close to the aftertreatment device 200.

[0024] Among them, the corrugated pipe 120 is selected as a corrugated pipe 120 without internal annular grooves.

[0025] The vent pipe 130 includes: an inner heat-insulating layer and an outer protective layer.

[0026] The engine exhaust system needs to simultaneously meet the dual requirements of heat preservation and cooling. For heat preservation, it must maintain the operating temperature of the aftertreatment system catalysts (such as diesel oxidation catalysts DOC and SCR) to ensure efficient catalytic reactions. In the SCR system, the urea tank and injection system need to be insulated to prevent low-temperature crystallization of the urea solution and ensure its high-temperature decomposition into ammonia to participate in the reaction. For cooling, excessively high exhaust temperatures may damage aftertreatment system components. Therefore, to optimize the exhaust system, a heat-insulating inner layer and a protective outer layer are designed to reduce temperature impact. This avoids a significant temperature drop when the high-temperature exhaust flows through the bellows 120 due to a lack of insulation in the front exhaust pipe 100. This temperature drop directly affects the catalytic efficiency of the aftertreatment device 200 and the urea decomposition effect, thus reducing the pollutant conversion rate. Therefore, a heat-insulating inner layer is used in the exhaust pipe 130 to improve the heat preservation effect. For example, using aluminum foil and fiberglass cloth as the heat-insulating inner layer can meet the heat preservation and cooling balance requirements when the exhaust flows from the front exhaust pipe 100 into the aftertreatment device 200.

[0027] In a preferred embodiment, as shown in the appendix Figure 1 As shown, a wire harness support plate 400 is fixedly installed at the connection between the exhaust port of the aftertreatment device 200 and the rear exhaust pipe 300 to prevent the wire harness from being damaged by the high temperature of the rear exhaust pipe 300.

[0028] In a preferred embodiment, as shown in the appendix Figure 1 As shown, the inner insulation layer is made of fiberglass to improve the insulation effect of the vent pipe 130.

[0029] In a preferred embodiment, as shown in the appendix Figure 1 As shown, the outer protective layer is made of stainless steel so that the vent pipe 130 has a protective function.

[0030] In a preferred embodiment, as shown in the appendix Figure 1 As shown, the diameter of the bellows 120 is set to 80-100mm; the small diameter bellows 120 is used to eliminate exhaust whistling and reduce temperature decay.

[0031] In a preferred embodiment, as shown in the appendix Figure 1 As shown, the length of the bellows 120 is set to 80-100mm. The short bellows 120 is used to eliminate exhaust whistling and reduce temperature decay.

[0032] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An exhaust system, comprising: A front exhaust pipe (100) connected to the engine exhaust port via an exhaust manifold, an aftertreatment device (200) mounted on the chassis, and a rear exhaust pipe (300) fixedly connected to the exhaust port of the aftertreatment device (200), wherein the outlet end of the front exhaust pipe (100) is fixedly connected to the intake port of the aftertreatment device (200); characterized in that: The front exhaust pipe (100) includes: an intake pipe (110) connected to the engine exhaust port via an exhaust manifold, a bellows pipe (120) away from the aftertreatment device (200), and an exhaust pipe (130) fixedly connected to the intake port of the aftertreatment device (200). The intake pipe (110) is fixedly connected to the exhaust pipe (130) via the bellows pipe (120). The vent pipe (130) includes: a heat-insulating inner layer and a protective outer layer.

2. The exhaust system according to claim 1, characterized in that: A wire harness support plate (400) is fixedly installed at the connection between the exhaust port of the post-processing device (200) and the rear exhaust pipe (300).

3. An exhaust system according to claim 1, characterized in that: The material of the heat-insulating inner layer is glass fiber.

4. An exhaust system according to claim 1, characterized in that: The material of the protective outer layer is stainless steel.

5. An exhaust system according to claim 1, characterized in that: The diameter of the bellows (120) is set to 80-100 mm.

6. An exhaust system according to claim 1, characterized in that: The length of the corrugated pipe (120) is set to 80-100mm.

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