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Engine exhaust pipe and preparation process thereof

A preparation process and exhaust pipe technology, which is applied in the direction of engine components, machines/engines, mechanical equipment, etc., can solve the problems such as the adverse effect of the service life of the exhaust pipe, the inability to withstand the strong vibration of the engine, and the easy occurrence of cracks in the exhaust pipe. Achieve high stability, improve heat resistance, and improve anti-oxidation performance

Pending Publication Date: 2021-02-05
新昌县精锐机械有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve this problem, the existing engine exhaust pipe generally adopts the method of covering the surface with heat insulating material. This method not only has a poor heat insulation effect, but the temperature of the outer surface of the exhaust pipe is still as high as 400 ℃, and it is also shock-resistant. Poor performance, unable to withstand the strong vibration generated by the engine when starting and stopping, after long-term use, cracks are prone to appear inside the exhaust pipe, which will adversely affect the service life of the exhaust pipe

Method used

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  • Engine exhaust pipe and preparation process thereof
  • Engine exhaust pipe and preparation process thereof
  • Engine exhaust pipe and preparation process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] see Figure 1 to Figure 4 As shown, an engine exhaust pipe includes an outer pipe layer 1 and an inner pipe layer 2. A heat insulating layer 3 is arranged between the inner pipe layer 2 and the outer pipe layer 1. The heat insulating layer 3 is made of carbon fiber composite fabric, and the carbon fiber composite The fabric includes a reinforcement layer 4 and a thermal insulation layer 5 composited with the reinforcement layer 4 by impregnating resin. The reinforcement layer 4 is woven from a number of reinforcement yarns 6 in warp and weft. The reinforcement yarn 6 is twisted from a number of carbon fibers. It is braided with a number of wefts 8 warp and weft, the warp 7 is twisted by a number of glass fibers, the weft 8 is twisted by a number of ceramic fibers, the inner tube layer 2 and the outer tube layer 1 are made of heat-resistant ferritic stainless steel , its raw materials and chemical composition mass percentages are: C-0.08%, Si-0.9%, Mn-0.44%, P-0.003%, S-...

Embodiment 2

[0049] see Figure 1 to Figure 4 As shown, an engine exhaust pipe includes an outer pipe layer 1 and an inner pipe layer 2. A heat insulating layer 3 is arranged between the inner pipe layer 2 and the outer pipe layer 1. The heat insulating layer 3 is made of carbon fiber composite fabric, and the carbon fiber composite The fabric includes a reinforcement layer 4 and a thermal insulation layer 5 composited with the reinforcement layer 4 by impregnating resin. The reinforcement layer 4 is woven from a number of reinforcement yarns 6 in warp and weft. The reinforcement yarn 6 is twisted from a number of carbon fibers. It is braided with a number of wefts 8 warp and weft, the warp 7 is twisted by a number of glass fibers, the weft 8 is twisted by a number of ceramic fibers, the inner tube layer 2 and the outer tube layer 1 are made of heat-resistant ferritic stainless steel , its raw materials and chemical composition mass percentages are: C-0.1%, Si-1.12%, Mn-1.34%, P-0.011%, S-...

Embodiment 3

[0051] A process for preparing an engine exhaust pipe, for preparing an engine exhaust pipe, comprising the following steps:

[0052] S1: Proportioning raw materials, weighing a certain amount of heat-resistant ferritic stainless steel raw materials, and preparing a certain amount of Fe for use;

[0053] S2: Raw material smelting. Pour a certain amount of raw materials, FE and unavoidable impurities prepared in step S1 into the melting furnace for high-temperature heating and smelting. When the temperature in the melting furnace rises to 1550°C, continue smelting for 1.5 to 2.5 hours. Then take samples so that the mass percentage of each chemical component in the furnace charge is within the following control range in the spectrometer detection: C-0.08%~0.1%, Si-0.9%~1.12%, Mn-0.44%~1.34%, P-0.003% ~0.011%, S-0.002%~0.008%, Cr-16.9%~19.14%, Al-0.95%~1.01%, Ti-0.4%~0.8%, Mo-0.75%~1.25%, you can get mixed metal liquid ;

[0054] S3: raw material refining, passing the mixed met...

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Abstract

The invention discloses an engine exhaust pipe and a preparation process thereof. According to the technical scheme, the engine exhaust pipe is characterized by comprising a pipe outer layer and a pipe inner layer, a heat insulation layer is arranged between the pipe inner layer and the pipe outer layer, the heat insulation layer is made of carbon fiber composite fabric, the carbon fiber compositefabric comprises a reinforcing layer and a heat insulation layer, and the reinforcing layer is formed by weaving a plurality of reinforcing yarns in a warp and weft mode; the reinforcing yarn is formed by twisting a plurality of carbon fibers, the heat insulation layer is formed by weaving a plurality of warps and a plurality of wefts, the warps are formed by twisting a plurality of glass fibers,and the wefts are formed by twisting a plurality of ceramic fibers. The engine exhaust pipe has the beneficial effects that the heat insulation layer made of the carbon fiber composite fabric is arranged between the pipe inner layer and the pipe outer layer, so that the heat insulation effect of the exhaust pipe is excellent, and the service life of the exhaust pipe is prolonged.

Description

technical field [0001] The invention relates to exhaust pipe production technology, more specifically, it relates to an engine exhaust pipe and its preparation process. Background technique [0002] With the continuous advancement of automobile engine technology, the power per liter and compression ratio of the engine are also increasing. As an important part of the engine, the exhaust pipe is becoming more and more complicated, and the requirements for the exhaust pipe are also constantly increasing. [0003] At present, the engine will generate heat during the working process, causing the temperature in the working area of ​​the exhaust pipe to rise sharply, while the automobile exhaust pipe needs to repeatedly withstand the heating or cooling process caused by the engine starting and stopping. Therefore, the existing High-quality automobile exhaust pipes not only require good high temperature resistance, but also have excellent fatigue strength under high temperature cond...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B1/08B32B9/00B32B5/02B32B5/08B32B9/04B32B5/26B32B15/18B32B17/02B32B17/06B32B27/04B32B7/027B32B7/022B32B7/02B32B33/00B32B37/00B32B37/10B32B38/00B32B38/08C22C38/02C22C38/04C22C38/06C22C38/28C22C38/22B22C9/24B23P15/00F01N13/00
CPCB32B1/08B32B15/18B32B15/14B32B5/02B32B5/08B32B5/26B32B7/027B32B7/022B32B7/02B32B33/00B32B37/00B32B37/10B32B38/00B32B38/0012B32B38/0004B32B38/08C22C38/02C22C38/04C22C38/06C22C38/28C22C38/22B22C9/24B23P15/00F01N13/00B32B2038/0016B32B2260/021B32B2260/046B32B2262/106B32B2262/101B32B2307/306B32B2307/50B32B2307/536B32B2307/752B32B2605/08
Inventor 何红军
Owner 新昌县精锐机械有限公司
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