CN112392580A - Engine exhaust turbulent flow pipe and processing die thereof - Google Patents
Engine exhaust turbulent flow pipe and processing die thereof Download PDFInfo
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- CN112392580A CN112392580A CN202011139163.XA CN202011139163A CN112392580A CN 112392580 A CN112392580 A CN 112392580A CN 202011139163 A CN202011139163 A CN 202011139163A CN 112392580 A CN112392580 A CN 112392580A
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- die
- engine exhaust
- lower die
- turbulent flow
- die cavity
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/08—Other arrangements or adaptations of exhaust conduits
- F01N13/082—Other arrangements or adaptations of exhaust conduits of tailpipe, e.g. with means for mixing air with exhaust for exhaust cooling, dilution or evacuation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D26/00—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces
- B21D26/02—Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces by applying fluid pressure
- B21D26/033—Deforming tubular bodies
- B21D26/047—Mould construction
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Exhaust Silencers (AREA)
Abstract
The invention provides an engine exhaust turbulent flow pipe which comprises a pipe body, wherein a plurality of positions of the side wall of the pipe body are inwards sunken to form a plurality of inwards convex structures. The inner convex structure playing a role in disturbing flow in the pipe body is formed by the fact that the side wall of the pipe body is sunken towards the inside of the pipe body, and therefore the thickness of each part of the pipe body is consistent. The structure is easy to process, the structure is more stable, and the tube body formed by the inward convex structure is not additionally provided with additional materials, so that the quality of the tube body is not changed, and the light design requirement is met.
Description
Technical Field
The invention relates to the technical field of engine exhaust systems, in particular to an engine exhaust turbulent flow pipe and a processing die thereof.
Background
A flow disturbing structure is generally installed in an exhaust system of an automobile, particularly an exhaust system of a turbocharged engine. The engine exhaust is vortex-shaped after being discharged by the turbocharger, the movement efficiency of the engine exhaust in a zigzag exhaust system is very low, and the turbulent flow pipe is used for changing the movement track of gas in the exhaust system and improving the exhaust efficiency. The existing turbulent flow pipe is composed of an inner layer and an outer layer or a multilayer structure, wherein the inner layer is a spoiler which generally comprises 3 or more spoilers; the outer layer is outer courage blast pipe, and the spoiler is generally fixed welding or riveting in outer courage blast pipe, and the vortex tube structure of this kind of structure is complicated, the processing degree of difficulty is big, with high costs.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides an engine exhaust turbulent flow pipe and a processing die thereof.
The invention provides an engine exhaust turbulent flow pipe which comprises a pipe body, wherein a plurality of positions of the side wall of the pipe body are inwards sunken to form a plurality of inwards convex structures.
Preferably, the plurality of inner convex structures are uniformly distributed on the side wall of the tube body in the circumferential direction.
Preferably, the cross section of the inner convex structure is in a drop-like shape.
Preferably, the inner convex structure extends spirally on the side wall of the tube body.
Preferably, the wall thickness of the pipe body is 1-3 mm.
The invention also provides a processing die of the engine exhaust turbulent flow pipe, which comprises an upper die plate, a lower die plate, an upper die, a first lower die, a second lower die, a first water injection punch and a second water injection punch, wherein the upper die is fixed at the bottom end of the upper die plate and is provided with an upper die cavity; under the matched die state of the upper die, the first lower die and the second lower die, the upper die cavity, the first lower die cavity and the second lower die cavity are spliced to form a forming die cavity for placing a pipe to be processed, a plurality of bulges are uniformly arranged on the circumferential direction of the inner wall of the forming die cavity, and the first water injection punch and the second water injection punch are positioned at two ends of the die cavity, are respectively butted with two ends of the pipe to be processed in the die cavity and are used for injecting high-pressure liquid into the pipe.
Preferably, the cross section of the bulge is in a water-drop-like shape, and the bulge extends spirally on the inner wall of the forming die cavity.
Preferably, one side of the first lower die, which is far away from the second lower die, is connected with a first lower wedge, one side of the second lower die, which is far away from the first lower die, is connected with a second lower wedge, the bottom end of the upper die plate, which corresponds to the first lower wedge and the second lower wedge, is provided with a first upper wedge and a second upper wedge respectively, and the lower die plate is provided with a first clamping groove and a second clamping groove, which are used for inserting the first upper wedge and the second upper wedge.
Preferably, the lower template is provided with guide blocks at two ends of the first lower die and the second lower die.
Preferably, a spring is connected between the first lower die and the second lower die.
According to the engine exhaust turbulent flow pipe provided by the invention, the inward convex structure playing a turbulent flow role in the pipe body is formed by sinking the side wall of the pipe body to the inside of the pipe body, so that the thicknesses of all parts of the pipe body are consistent. This structural form workable, the structure is more stable, and because the body itself that comes of the formation of interior convex structure does not have extra increase material for the body quality does not produce the change, accords with the light-weighted designing requirement, has fine vortex effect, stable performance, precision height, workable, with low costs.
Drawings
FIG. 1 is a schematic structural view of an engine exhaust turbulent flow pipe according to the present invention;
FIG. 2 is a side view of an engine exhaust gas turbulence pipe according to the present invention;
FIG. 3 is a cross-sectional view taken along line D-D of FIG. 2;
FIG. 4 is a schematic diagram of the working of a mold for machining an exhaust turbulent flow tube of an engine according to the present invention;
FIG. 5 is a schematic structural diagram of a machining mold for an engine exhaust turbulent flow pipe according to the present invention;
fig. 6 is a schematic structural view of a molding cavity of a processing mold of an engine exhaust turbulent flow pipe provided by the invention.
Detailed Description
Referring to fig. 1-3, the invention provides an engine exhaust turbulent flow pipe and a processing mold thereof, which comprises a pipe body 1, wherein a plurality of positions on the side wall of the pipe body 1 are inwards sunken to form a plurality of inwards convex structures 2, and the plurality of inwards convex structures 2 are uniformly distributed on the side wall of the pipe body 1 in the circumferential direction.
The cross section of the inner convex structure 2 is in a water-drop-like shape, and the inner convex structure 2 extends spirally on the side wall of the pipe body 1.
The wall thickness of the pipe body 1 is 1-3 mm.
Compared with the welded bulges, the hydraulically formed inward convex structure 2 is more uniform, and the pipe wall is thinner.
Referring to fig. 4-6, the invention further provides a processing die for an engine exhaust turbulent flow pipe, which comprises an upper die plate 3, a lower die plate 4, an upper die 5, a first lower die 6, a second lower die 7, a first water injection punch 8 and a second water injection punch 9, wherein:
go up mould 5 and fix in 3 bottom of cope match-plate pattern and go up mould 5 and be equipped with the die cavity, first lower mould 6, the equal movable mounting of second lower mould 7 are equipped with first lower die cavity, second lower die cavity respectively on lower bolster 4 and first lower mould 6, second lower mould 7, are connected with spring 18 between first lower mould 6 and the second lower mould 7. One side of the first lower die 6, which is far away from the second lower die 7, is connected with a first lower wedge-shaped inclined block 12, one side of the second lower die 7, which is far away from the first lower die 6, is connected with a second lower wedge-shaped inclined block 13, the bottom end of the upper die plate 3 is provided with a first upper wedge-shaped inclined block 14 and a second upper wedge-shaped inclined block 15 respectively at the corresponding positions of the first lower wedge-shaped inclined block 12 and the second lower wedge-shaped inclined block 13, and the lower die plate 4 is provided with a first upper wedge-shaped inclined block 14, a second upper wedge-shaped inclined block 15-inserted first clamping groove and a second clamping groove 16. And guide blocks 17 are arranged at the two ends of the first lower die 6 and the second lower die 7 on the lower template 4.
Under the matched die state of the upper die 5, the first lower die 6 and the second lower die 7, the upper die cavity, the first lower die cavity and the second lower die cavity are spliced to form a molding die cavity 10 for placing a pipe to be processed, a plurality of bulges 11 are uniformly arranged on the circumferential direction of the inner wall of the molding die cavity 10, the cross sections of the bulges 11 are in a water-drop-like shape, and the bulges 11 extend spirally on the inner wall of the molding die cavity 10. The first water injection punch 8 and the second water injection punch 9 are located at two ends of the die cavity and are respectively butted with two ends of a pipe to be processed in the die cavity and used for injecting high-pressure liquid into the pipe.
The invention also provides a working principle of the processing die of the engine exhaust turbulent flow tube, which is as follows:
1. cutting a pipe to be processed into a short pipe with a certain length or bending the pipe, and then placing the short pipe into a space between a first lower die and a second lower die;
2. when the upper die 5 is closed, the first upper wedge-shaped inclined block 14 and the second upper wedge-shaped inclined block 15 move downwards to respectively contact the first lower wedge-shaped inclined block 12 and the second lower wedge-shaped inclined block 13, and compress the first lower die 6 and the second lower die 7 to slide towards the middle until the first lower die 6 and the second lower die 7 are closed; the upper die 5 is continuously pressed down to be locked with the first lower die 6 and the second lower die 7, and the first upper wedge-shaped inclined block 14 and the second upper wedge-shaped inclined block 15 are respectively inserted into a first clamping groove and a second clamping groove 16 of the lower die plate so as to prevent the first lower die 6 and the second lower die 7 from being separated by internal pressure expansion;
3. the first water injection punch 8 and the second water injection punch 9 are connected with a supercharger of an internal high-pressure forming machine; the first water injection punch 8 and the second water injection punch 9 move into a pipe orifice of a pipe to be processed under the action of side cylinders at two ends and seal the pipe orifice;
4. the booster of the internal high-pressure forming machine injects high-pressure liquid into the pipe to be processed, the first water injection punch 8 and the second water injection punch 9 push the pipe orifice material to flow inwards, and the length L, the inner diameter d and the wall thickness h of the pipe of the first water injection punch 8 and the second water injection punch 9 satisfy the following relations: l is approximately equal to d + h 15%; along with the continuous rise of the internal pressure, the pipe is stressed and expanded to be jointed with the die;
5. after the pipe is expanded to be attached to the inner wall of the forming die cavity, the internal pressure is removed, the first water injection punch 8 and the second water injection punch 9 are withdrawn, the upper die 5 is opened, and the first lower die 6 and the second lower die 7 are uniformly separated under the action of a spring;
6. and taking out the formed product.
Compared with the welded bulges, the hydraulically formed inward convex structure 2 is more uniform, and the pipe wall is thinner. The turbulent tube material processed by internal high pressure forming has uniform wall thickness, stable performance and high dimensional precision, and is suitable for being assembled and welded with other components of an exhaust system.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (10)
1. The engine exhaust turbulent flow pipe is characterized by comprising a pipe body (1), wherein a plurality of positions on the side wall of the pipe body (1) are inwards sunken to form a plurality of inwards convex structures (2).
2. The engine exhaust gas turbulence pipe according to claim 1, characterized in that said plurality of inner convex structures (2) are circumferentially evenly distributed on the side wall of the pipe body (1).
3. The engine exhaust gas turbulence pipe according to claim 1, characterized in that said inner convex structure (2) has a drop-like cross-section.
4. The engine exhaust gas turbulence pipe according to claim 3, characterized in that said inner convex structure (2) extends helically on the side wall of the pipe body (1).
5. The engine exhaust gas turbulence pipe according to any one of claims 1-4, characterized in that the pipe body (1) has a wall thickness of 1-3 mm.
6. The machining die for the exhaust turbulent flow pipe of the engine is characterized by comprising an upper die plate (3), a lower die plate (4), an upper die (5), a first lower die (6), a second lower die (7), a first water injection punch (8) and a second water injection punch (9), wherein the upper die (5) is fixed at the bottom end of the upper die plate (3), the upper die (5) is provided with an upper die cavity, the first lower die (6) and the second lower die (7) are movably mounted on the lower die plate (4), and the first lower die (6) and the second lower die (7) are respectively provided with a first lower die cavity and a second lower die cavity; under last mould (5), first lower mould (6), second lower mould (7) compound die state, go up die cavity, first die cavity, the amalgamation of second lower die cavity forms forming die cavity (10) that are used for placing the tubular product of treating processing, forming die cavity (10) inner wall circumference evenly is provided with a plurality of archs (11), first water injection drift (8), second water injection drift (9) are located the die cavity both ends and wait to process the butt joint of tubular product both ends and be used for injecting high-pressure liquid into tubular product with the die cavity respectively.
7. The processing die for the engine exhaust turbulent flow pipe according to claim 6, characterized in that the cross section of the bulge (11) is shaped like a water drop, and the bulge (11) extends spirally on the inner wall of the molding die cavity (10).
8. The processing mold of the engine exhaust turbulent flow pipe according to claim 6 or 7, characterized in that one side of the first lower mold (6) far away from the second lower mold (7) is connected with a first lower wedge-shaped inclined block (12), one side of the second lower mold (7) far away from the first lower mold (6) is connected with a second lower wedge-shaped inclined block (13), the bottom end of the upper mold plate (3) is provided with a first upper wedge-shaped inclined block (14) and a second upper wedge-shaped inclined block (15) at positions corresponding to the first lower wedge-shaped inclined block (12) and the second lower wedge-shaped inclined block (13), and the lower mold plate (4) is provided with a first clamping groove and a second clamping groove (16) for inserting the first upper wedge-shaped inclined block (14) and the second upper wedge-shaped inclined block (15).
9. The processing die of the engine exhaust turbulent flow pipe according to claim 6 or 7, characterized in that guide blocks (17) are arranged on the lower template (4) at two ends of the first lower die (6) and the second lower die (7).
10. The processing die of the engine exhaust turbulent flow pipe according to claim 6 or 7, characterized in that a spring (18) is connected between the first lower die (6) and the second lower die (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011139163.XA CN112392580A (en) | 2020-10-22 | 2020-10-22 | Engine exhaust turbulent flow pipe and processing die thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011139163.XA CN112392580A (en) | 2020-10-22 | 2020-10-22 | Engine exhaust turbulent flow pipe and processing die thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112392580A true CN112392580A (en) | 2021-02-23 |
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ID=74596489
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011139163.XA Pending CN112392580A (en) | 2020-10-22 | 2020-10-22 | Engine exhaust turbulent flow pipe and processing die thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112392580A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114346181A (en) * | 2022-01-10 | 2022-04-15 | 重庆市精利模具制作有限责任公司 | Thin aluminum exhaust pipe processing die for engine |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWM318662U (en) * | 2007-03-07 | 2007-09-11 | Chang-Ming Yang | Inner tube structure of automobile exhaust pipe |
| CN101085460A (en) * | 2007-07-11 | 2007-12-12 | 林耿兴 | Double-layer metal heat preservation container synchronization liquid expansion forming device and forming method for the same |
| CN102330594A (en) * | 2011-07-11 | 2012-01-25 | 上海科米钢管有限公司 | Exhaust pipe applying rotary arc-shaped heat exchange tube |
| CN104438540A (en) * | 2014-11-26 | 2015-03-25 | 西安交通大学 | Low-pressure internal high pressure forming device for torsion beam |
| CN108087068A (en) * | 2017-12-31 | 2018-05-29 | 潍坊倍力汽车零部件有限公司 | Eddy current type urea jet mixing device |
| CN111715766A (en) * | 2020-06-17 | 2020-09-29 | 大连理工大学 | Special gas-liquid mixing bulging die for thin-wall metal pipe fitting |
-
2020
- 2020-10-22 CN CN202011139163.XA patent/CN112392580A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWM318662U (en) * | 2007-03-07 | 2007-09-11 | Chang-Ming Yang | Inner tube structure of automobile exhaust pipe |
| CN101085460A (en) * | 2007-07-11 | 2007-12-12 | 林耿兴 | Double-layer metal heat preservation container synchronization liquid expansion forming device and forming method for the same |
| CN102330594A (en) * | 2011-07-11 | 2012-01-25 | 上海科米钢管有限公司 | Exhaust pipe applying rotary arc-shaped heat exchange tube |
| CN104438540A (en) * | 2014-11-26 | 2015-03-25 | 西安交通大学 | Low-pressure internal high pressure forming device for torsion beam |
| CN108087068A (en) * | 2017-12-31 | 2018-05-29 | 潍坊倍力汽车零部件有限公司 | Eddy current type urea jet mixing device |
| CN111715766A (en) * | 2020-06-17 | 2020-09-29 | 大连理工大学 | Special gas-liquid mixing bulging die for thin-wall metal pipe fitting |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114346181A (en) * | 2022-01-10 | 2022-04-15 | 重庆市精利模具制作有限责任公司 | Thin aluminum exhaust pipe processing die for engine |
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Application publication date: 20210223 |