Exhaust device of engine

Abstract

An exhaust device of an engine comprises a high-temperature-resistant plastic shell, an air inlet pipe connected with the plastic shell and an air outlet pipe connected with the plastic shell. The plastic shell is provided with an airflow cavity and an inner wall; the exhaust device is further provided with a corrosion-resistant heat insulation coating fixed to the inner wall. Compared with the prior art, the exhaust device comprises the high-temperature-resistant plastic shell and the corrosion-resistant heat insulation coating fixed on the inner wall, and the plastic shell is adopted, so that the weight is reduced, and the light weight is realized; by arranging the heat insulation coating, heat insulation can be conducted on high-temperature exhaust gas, and the temperature of the exhaust gas transmitted to the plastic shell is lower than the temperature capable of being borne by the plastic shell.

Description

Background Art

[0002] The exhaust device of the engine in the related art generally includes a muffler bag, an air inlet pipe connected to the muffler bag, and an air outlet pipe connected to the muffler bag. A core pipe can be arranged in the muffler bag as needed to achieve better muffler.

[0003] Since the exhaust gas discharged by the engine is generally highly corrosive, these exhaust gases are discharged into the air after passing through the exhaust device. In this process, the exhaust device will be strongly corroded, and the external environment may also corrode the exhaust device, especially the corrosion at the welding position is often more serious. The exhaust device in the related technology is mainly made of stainless steel, but even so, corrosion failure will still occur in some cases. In addition, with the increasingly stringent national emission regulations and the continuous extension of the after-sales warranty period, traditional exhaust devices have been difficult to meet future use requirements, which has brought huge challenges to product development. At the same time, as automobile OEMs are constantly pursuing lightweight design, traditional exhaust materials represented by stainless steel have become increasingly unable to meet the characteristics of lightweight design.

[0004] Therefore, it is necessary to design an exhaust device that is corrosion-resistant and lightweight. Utility Model Content

[0005] The utility model aims to provide an exhaust device which is corrosion-resistant and lightweight.

[0006] To achieve the above-mentioned purpose, the utility model adopts the following technical solution: an exhaust device of an engine, which includes a high-temperature resistant plastic shell, an air intake pipe connected to the plastic shell, and an air outlet pipe connected to the plastic shell; the plastic shell is provided with an air flow cavity and an inner wall; the exhaust device is also provided with a corrosion-resistant heat-insulating coating fixed on the inner wall.

[0007] As a further improved technical solution of the utility model, the plastic shell is a plastic shell that can withstand a temperature T1, wherein 250°C≤T1≤400°C.

[0008] As a further improved technical solution of the utility model, the thermal insulation coating is a nano-ceramic thermal insulation coating or a metal oxide thermal insulation coating.

[0009] As a further improved technical solution of the utility model, the thermal insulation coating is coated on the inner wall; the thermal insulation coating can insulate the high-temperature exhaust gas, so that the exhaust gas temperature transmitted to the plastic shell is lower than the temperature that the plastic shell itself can withstand.

[0010] As a further improved technical solution of the utility model, the thickness of the plastic shell is D1, wherein D1 ≥ 1 mm.

[0011] As a further improved technical solution of the utility model, the thickness of the thermal insulation coating is D2, wherein D2≥100 μm.

[0012] As a further improved technical solution of the utility model, the plastic shell includes a first end wall and a second end wall, and the airflow cavity is located between the first end wall and the second end wall.

[0013] As a further improved technical solution of the utility model, the air inlet pipe is fixed to the first end wall and at least partially protrudes into the air flow cavity.

[0014] As a further improved technical solution of the utility model, the air outlet pipe is fixed to the second end wall and at least partially protrudes into the air flow cavity.

[0015] As a further improved technical solution of the utility model, the plastic shell is a silencer shell, and the airflow cavity is a silencer cavity.

[0016] Compared with the prior art, the exhaust device of the utility model includes a high-temperature resistant plastic shell and a corrosion-resistant heat-insulating coating fixed on the inner wall. The use of a plastic shell is conducive to reducing weight and achieving lightweight. By setting the heat-insulating coating, high-temperature exhaust can be insulated, so that the exhaust temperature transmitted to the plastic shell is lower than the temperature that the plastic shell itself can withstand. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of an exhaust device of the utility model in one embodiment.

[0018] Figure 2 is along Figure 1 Schematic diagram of the cross section along line AA.

[0019] Figure 3 It is a cross-sectional schematic diagram of the exhaust device of the utility model, wherein the cross section shows the plastic shell and the heat-insulating coating. DETAILED DESCRIPTION

[0020] The specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. If there are several specific embodiments, the features of these embodiments can be combined with each other without conflict. When the description involves the drawings, unless otherwise specified, the same numbers or symbols in different drawings represent the same or similar elements. The contents described in the following exemplary embodiments do not represent all embodiments of the present invention. On the contrary, they are only examples of products consistent with the present invention as recorded in the claims of the present invention.

[0021] The terms used in the present invention are only for the purpose of describing specific implementations and are not intended to limit the scope of protection of the present invention. It should be understood that the terms such as "first", "second" and similar terms used in the specification and claims of the present invention do not indicate any order, quantity or importance, but are only used to distinguish the names of features.

[0022] Please combine Figures 1 to 3 As shown, the utility model discloses an exhaust device 100 of an engine, which comprises a high temperature resistant plastic shell 1, an air inlet pipe 2 connected to the plastic shell 1, and an air outlet pipe 3 connected to the plastic shell 1. In the embodiment shown in the figure of the utility model, the plastic shell 1 is a sound-absorbing shell.

[0023] In the illustrated embodiment of the present invention, the plastic housing 1 is integrally formed, and is provided with an airflow cavity 10 and an inner wall 11; the exhaust device 100 is further provided with a corrosion-resistant heat-insulating coating 12 fixed on the inner wall 11. In the illustrated embodiment of the present invention, the airflow cavity 10 is a muffler cavity.

[0024] In one embodiment of the utility model, the thermal insulation coating 12 is coated (including but not limited to painting, spraying, spin coating, dipping and pulling, etc.) on the inner wall 11; the thermal insulation coating 12 can insulate the high-temperature exhaust gas, so that the exhaust gas temperature transmitted to the plastic shell 1 is lower than the temperature that the plastic shell 1 itself can withstand.

[0025] In one embodiment of the present invention, the plastic shell 1 is a plastic shell capable of withstanding a temperature T1, wherein 250° C. ≤ T1 ≤ 400° C. The thickness of the plastic shell 1 is D1, wherein D1 ≥ 1 mm.

[0026] In one embodiment of the present invention, the thermal insulation coating 12 is a nano ceramic thermal insulation coating or a metal oxide thermal insulation coating. The thickness of the thermal insulation coating is D2, wherein D2 ≥ 100 μm.

[0027] The plastic housing 1 includes a first end wall 13 and a second end wall 14 , and the airflow cavity 10 is located between the first end wall 13 and the second end wall 14 .

[0028] The air inlet pipe 2 is fixed to the first end wall 13 and at least partially protrudes into the air flow cavity 10. The air outlet pipe 3 is fixed to the second end wall 14 and at least partially protrudes into the air flow cavity 10.

[0029] Compared with the prior art, the exhaust device 100 of the utility model includes a high-temperature resistant plastic shell 1 and a corrosion-resistant heat-insulating coating 12 fixed on the inner wall 11. The use of the plastic shell 1 is conducive to reducing weight and achieving lightweight. By setting the heat-insulating coating 12, the high-temperature exhaust gas can be insulated, so that the exhaust temperature transmitted to the plastic shell 1 is lower than the temperature that the plastic shell 1 itself can withstand.

[0030] The technicians in the relevant technical field can understand that when the engine is working normally, its exhaust temperature can reach 500°C to 600°C. In extreme cases, the temperature will be higher, so directly using the plastic shell 1 cannot meet the actual needs. The utility model pioneered the technical solution of combining the plastic shell 1 with the thermal insulation coating 12, which solves the problem of lightweight on the one hand, and solves the problem that the plastic shell 1 cannot directly withstand the high temperature of 500°C to 600°C on the other hand. Of course, the technicians in the relevant technical field can understand that in order to further avoid the problem of the plastic shell 1 being subjected to high temperature from the outside, the exhaust device 100 can also coat the thermal insulation coating 12 on the outer wall of the plastic shell 1, and the utility model will not elaborate on this.

[0031] The above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described in the present invention. The understanding of this specification should be based on the technical personnel in the relevant technical field. Although this specification has described the present invention in detail in conjunction with the above embodiments, ordinary technical personnel in the field should understand that the technical personnel in the relevant technical field can still modify or replace the present invention with equivalents, and all technical solutions and improvements that do not depart from the spirit and scope of the present invention should be covered within the scope of the claims of the present invention.

Claims

1. An exhaust device for an engine, characterized in that: The exhaust device comprises a high temperature resistant plastic shell, an air inlet pipe connected to the plastic shell and an air outlet pipe connected to the plastic shell; the plastic shell is provided with an air flow cavity and an inner wall; the exhaust device is also provided with a corrosion resistant heat insulation coating fixed on the inner wall.

2. The exhaust device of the engine according to claim 1, characterized in that: The plastic shell is a plastic shell that can withstand a temperature T1, wherein 250°C≤T1≤400°C.

3. The exhaust device of the engine according to claim 1, characterized in that: The thermal insulation coating is a nano ceramic thermal insulation coating or a metal oxide thermal insulation coating.

4. The exhaust device of the engine according to claim 1, characterized in that: The heat-insulating coating is coated on the inner wall; the heat-insulating coating can insulate the high-temperature exhaust gas, so that the temperature of the exhaust gas transferred to the plastic shell is lower than the temperature that the plastic shell itself can withstand.

5. The exhaust device of the engine according to claim 1, characterized in that: The thickness of the plastic shell is D1, wherein D1≥1 mm.

6. The exhaust device of the engine according to claim 1, characterized in that: The thickness of the thermal insulation coating is D2, wherein D2≥100 μm.

7. The exhaust device of the engine according to claim 1, characterized in that: The plastic shell includes a first end wall and a second end wall, and the airflow cavity is located between the first end wall and the second end wall.

8. The exhaust device of the engine according to claim 7, characterized in that: The air inlet pipe is fixed to the first end wall and at least partially protrudes into the air flow cavity.

9. The exhaust device of the engine according to claim 7, characterized in that: The air outlet pipe is fixed to the second end wall and at least partially protrudes into the air flow cavity.

10. The exhaust device of the engine according to claim 1, characterized in that: The plastic shell is a sound-absorbing bag shell, and the airflow cavity is a sound-absorbing cavity.

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