Self-cooling automobile exhaust pipe
By designing a spiral continuous fin and heat exchange jacket structure on the automobile exhaust pipe, the problem of excessive exhaust pipe temperature is solved by utilizing the thermosiphon effect and vortex formation, achieving efficient self-cooling, extending service life and improving vehicle safety.
Patent Information
- Application Number
- CN202520551300.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-26
- Publication Date
- 2025-12-19
- Estimated Expiration
- 2035-03-26
AI Technical Summary
Traditional car exhaust pipes lack self-cooling mechanisms, resulting in excessively high exhaust pipe temperatures, shortening their lifespan and increasing maintenance costs.
A self-cooling automotive exhaust pipe is designed, employing a spiral continuous fin and heat exchange jacket structure. It utilizes the thermosiphon effect and spiral fins to guide airflow to form vortices, combined with a porous ceramic coating to enhance heat dissipation.
Through the synergistic effect of thermosiphon and spiral fins, efficient self-cooling is achieved, reducing exhaust pipe temperature, extending service life, and improving vehicle safety and stability.
Smart Images
Figure CN223689803U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to exhaust pipe field relates to a self cooling automobile exhaust pipe. BACKGROUND
[0002] With the development of automobile industry, the requirement of automobile performance and safety is continuously improved. Automobile exhaust pipe as the key part of engine exhaust system, in the working process, will be in the extremely high temperature state because of the high temperature of tail gas. The traditional automobile exhaust pipe often only has simple exhaust function, lacks effective self cooling means. The exhaust pipe temperature is too high, which not only accelerates the aging and corrosion of the exhaust pipe material, shortens its service life, and increases the maintenance cost.
[0003] Therefore, in order to solve the problem in the prior art, a self cooling automobile exhaust pipe with simple structure needs to be designed. UTILITY MODEL CONTENT
[0004] The utility model discloses a self cooling automobile exhaust pipe to solve the problem of prior art.
[0005] The utility model discloses a self cooling automobile exhaust pipe, which comprises an exhaust main pipe, a spiral continuous fin and a heat exchange sleeve.
[0006] Further improvement, the front end pitch of the spiral continuous fin is 40mm, the tail end pitch of the spiral continuous fin is 20mm, and the thickness of the spiral continuous fin is 1-1.5mm.
[0007] Further improvement, the top of the heat exchange sleeve is provided with three groups of interval air outlets, and the bottom of the heat exchange sleeve is provided with three groups of interval air inlets.
[0008] Further improvement, the heat exchange sleeve is coated with a porous ceramic coating.
[0009] Further improvement, the axis of the spiral continuous fin and the exhaust main pipe is inclined at 15°-25°.
[0010] Compared with the prior art, the self cooling automobile exhaust pipe has the following advantages:
[0011] The exhaust main pipe discharges high-temperature tail gas, and the heat is transferred to the spiral continuous fins fixed outside the exhaust main pipe, the heat exchange sleeve is located outside the fins with a gap, air enters from the air inlet at the bottom of the heat exchange sleeve, becomes hot after absorbing the heat of the fins, and is discharged from the air outlet at the top after rising, forming a cycle, the spiral continuous fins are inclined to the axis of the exhaust main pipe, which can guide the air flow to spiral upward and form a vortex to enhance heat exchange; the inner diameter of the heat exchange sleeve decreases along the running direction of the tail gas, which can accelerate the upward movement of hot air and strengthen the thermosyphon effect.
[0012] Through the synergistic effect of the thermosyphon effect and the spiral continuous fins guiding the air flow, efficient self-cooling is realized, the temperature of the exhaust pipe is reduced, the surrounding components are protected, the service life of the exhaust pipe is prolonged, and the safety and stability of the vehicle are improved. BRIEF DESCRIPTION OF DRAWINGS
[0013] Fig. 1 It is a structure schematic view of the utility model
[0014] Fig. 2 It is a structure schematic view of the utility model
[0015] In the figure, 1 is an exhaust main pipe, 2 is a spiral continuous fin, 3 is a heat exchange sleeve, 31 is an air outlet, 32 is an air inlet, and 4 is a fixing sleeve. DETAILED DESCRIPTION
[0016] In the description of the utility model, it should be explained that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the utility model; unless otherwise explicitly specified and limited, the terms "installation", "connection", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, etc. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.
[0017] The embodiments and drawings are combined below Figs. 1-2 The technical scheme of the utility model is further described.
[0018] Example 1
[0019] The utility model provides an automobile exhaust pipe of self cooling, which comprises an exhaust main pipe 1, a spiral continuous fin 2 fixed to the outside of the exhaust main pipe 1 and a heat exchange sleeve 3 arranged outside the spiral continuous fin 2 with a gap, wherein the exhaust main pipe 1 and the heat exchange sleeve 3 are both provided with a fixing sleeve 4 for connecting a vehicle support, the spiral continuous fin 2 is arranged obliquely to the axis of the exhaust main pipe 1, the inner diameter of the heat exchange sleeve 3 decreases along the direction of exhaust gas running, the top of the heat exchange sleeve 3 is provided with an air outlet 31, and the bottom of the heat exchange sleeve 3 is provided with an air inlet 32.
[0020] As Figs. 1-2 shown in the utility model, the use principle is:
[0021] The exhaust main pipe discharges high-temperature exhaust gas, and the heat is transferred to the spiral continuous fin fixed to the outside of the exhaust main pipe. The heat exchange sleeve is arranged outside the fin with a gap, air enters the air inlet at the bottom of the heat exchange sleeve, becomes hot after absorbing the heat of the fin and is discharged from the air outlet at the top to form a cycle by using the thermosyphon effect. The exhaust main pipe and the heat exchange sleeve are connected to the vehicle support through the external fixing sleeve, which ensures the stability of the structure and does not need to be directly fixed and connected, so that complex fixing operation between the fin and the inner wall of the heat exchange sleeve is not needed, the installation difficulty is greatly reduced, and the assembly efficiency is improved. The spiral continuous fin is inclined to the axis of the exhaust main pipe, which can guide the air flow to spiral upward to form a vortex and enhance heat exchange. The inner diameter of the heat exchange sleeve decreases along the direction of exhaust gas running, which can accelerate the upward movement of hot air and strengthen the thermosyphon effect.
[0022] Through the synergistic effect of the thermosyphon effect and the spiral continuous fin guiding the air flow, efficient self-cooling is realized, the temperature of the exhaust pipe is reduced, the surrounding components are protected, the service life of the exhaust pipe is prolonged, and the safety and stability of the vehicle are improved.
[0023] As a further preferred embodiment, the pitch of the front end of the spiral continuous fin 2 is 40mm, the pitch of the tail end of the spiral continuous fin 2 is 20mm, and the thickness of the spiral continuous fin 2 is 1-1.5mm. The larger pitch of the front end can make the initially entering cold air quickly contact the fin and preliminarily absorb heat. As the temperature of the exhaust gas decreases along the exhaust direction, the smaller pitch of the tail end can make the air more fully exchange heat with the fin, thereby improving the heat exchange efficiency. The appropriate thickness of 1-1.5mm can ensure the strength of the fin while enabling the heat to be quickly transferred from the exhaust main pipe to the surface of the fin.
[0024] As a further preferred embodiment, the heat exchange sleeve 3 is provided with three sets of spaced air outlets 31 at the top, and three sets of spaced air inlets 32 at the bottom, so that air can enter and exit the heat exchange sleeve more evenly, avoiding local air intake or poor air exit. Cold air enters from multiple air inlets, and hot air exits from multiple air outlets, improving heat exchange efficiency and making the cooling effect more balanced, preventing local overheating and improving the reliability of the self-cooling system.
[0025] As a further preferred embodiment, the heat exchange sleeve 3 is coated with a porous ceramic coating, which has a large specific surface area, increasing the contact area between the heat exchange sleeve and air. When air flows through the heat exchange sleeve, more air molecules come into contact with the coating, accelerating heat transfer and improving the heat dissipation capacity of the heat exchange sleeve, enhancing the self-cooling effect. In practical applications, the heat dissipation area of the heat exchange sleeve coated with a porous ceramic coating is increased by about 1.3 times compared to that without coating, and the heat dissipation capacity is improved by 8%-12%.
[0026] As a further preferred embodiment, the helical continuous fin 2 is inclined at an angle of 15°-25° to the axis of the exhaust main pipe 1, making it easier to guide the oncoming airflow during vehicle travel to flow along a helical path at high speed, improving the heat dissipation effect. In actual experiments, when the fin inclination angle is within this range, the airflow velocity is increased by 11%-15% compared to no inclination fin, and the heat dissipation efficiency is significantly improved.
[0027] The above describes the preferred embodiments of the present application in detail. It should be understood that those skilled in the art can make many modifications and changes without creative labor according to the concept of the present application. Therefore, any technical solution obtained by logical analysis, reasoning or limited experiments based on the existing technology according to the concept of the present application shall be within the scope of protection determined by the claims.
Claims
1. A self-cooling automotive exhaust pipe, characterized in that, The exhaust main pipe, the helical continuous fin fixed to the outside of the exhaust main pipe, and the heat exchange sleeve located outside the helical continuous fin with a gap, the exhaust main pipe and the outside of the heat exchange sleeve are provided with fixing sleeves, the fixing sleeves are connected with automobile supports, the helical continuous fin and the axis of the exhaust main pipe are arranged obliquely, the inner diameter of the heat exchange sleeve is arranged to decrease along the running direction of the exhaust gas, the top of the heat exchange sleeve is provided with gas outlets, and the bottom of the heat exchange sleeve is provided with gas inlets. The helical continuous fin has a front end pitch of 40 mm, a tail end pitch of 20 mm, and a thickness of 1-1.5 mm.
2. A self-cooling exhaust pipe according to claim 1, wherein The top of the heat exchange sleeve is provided with three groups of spaced gas outlets, and the bottom of the heat exchange sleeve is provided with three groups of spaced gas inlets.
3. The self-cooling exhaust pipe according to claim 1, wherein The heat exchange sleeve is coated with a porous ceramic coating.
4. The self-cooling exhaust pipe according to claim 1, wherein The helical continuous fin is inclined to the axis of the exhaust main pipe at an angle of 15°-25°.
5. The self-cooling exhaust pipe according to claim 1, wherein