CN113833551B

CN113833551B - Corrugated pipe for national VI commercial vehicle

Info

Publication number: CN113833551B
Application number: CN202111118499.2A
Authority: CN
Inventors: 陈崇昆; 朱丽静; 王枫; 张哲炜
Original assignee: Aerosun Corp
Current assignee: Aerosun Corp
Priority date: 2021-09-23
Filing date: 2021-09-23
Publication date: 2022-05-27
Anticipated expiration: 2041-09-23
Also published as: CN113833551A

Abstract

The invention relates to a corrugated pipe for a national VI commercial vehicle, in particular to the technical field of corrugated pipes, which comprises a corrugated pipe main body, wherein two ends of the corrugated pipe main body are provided with straight edge sections, a metal winding pipe is embedded in the inner wall of the corrugated pipe main body, the outer surface of the metal winding pipe is uniformly wrapped with a metal knitting filter screen to form a heat insulation layer so as to reduce the heat energy conduction of a pipe body, a metal lining ring is arranged at the port of the corrugated pipe main body so as to fix the port of the metal winding pipe with the port of the corrugated pipe main body, a metal outer ring with a protective cover is also arranged at the port of the corrugated pipe main body so as to prevent transition waves at two ends of the corrugated pipe main body from colliding, the outer port of the metal outer ring is connected with a metal flange, and the metal flange is used for being connected with an exhaust manifold or a silencer; the shape of the inner wall of the corrugated pipe is determined by a shape curve formula. The invention effectively improves the treatment efficiency of the corrugated pipe on the automobile exhaust.

Description

Corrugated pipe for national VI commercial vehicle

Technical Field

The invention relates to the technical field of corrugated pipes, in particular to a corrugated pipe for a national VI commercial vehicle.

Background

The corrugated pipe for national VI commercial vehicle is a device which is used on a commercial vehicle and is arranged between an exhaust manifold and a silencer to ensure that the whole exhaust system is in sealed and flexible connection. The device plays the effects of damping and noise reduction, convenient installation, prolonging the service life of an exhaust system and increasing the comfort.

At present, manufacturers at home and abroad adopt structures such as 'U' corrugated pipes, '2S' and '3S' winding pipes and the like. Along with the development of the automobile market, higher requirements are put on the fracture rate, high flexibility, assembly efficiency and cost reduction and efficiency improvement of the device, and the popularization and implementation of the emission standard of the national VI increasingly show defects, so that the treatment efficiency of automobile exhaust is low.

Disclosure of Invention

Therefore, the invention provides a corrugated pipe for a national VI commercial vehicle, which is used for solving the problem of low automobile exhaust treatment efficiency caused by single shape structure of the corrugated pipe in the prior art.

In order to achieve the purpose, the invention provides a corrugated pipe for national VI commercial vehicles, which comprises,

the corrugated pipe comprises a corrugated pipe body, straight edge sections are arranged at two ends of the corrugated pipe body, a metal winding pipe is embedded in the inner wall of the corrugated pipe body, a metal knitting filter net is uniformly wrapped on the outer surface of the metal winding pipe to form a heat insulation layer, the metal knitting filter net is also used for attaching particles in gas, a metal lining ring is arranged at the port of the corrugated pipe body to fix the port of the metal winding pipe with the port of the corrugated pipe body, metal outer rings with protective covers are further arranged at the port of the corrugated pipe body to prevent transition waves at two ends of the corrugated pipe body from colliding, outer ports of the two metal outer rings are respectively connected with metal flanges, one metal flange is used for being connected with an exhaust manifold, and the other metal flange is used for being connected with a silencer;

the pipe wall of bellows comprises different segmental arcs, forms different regions to the particulate matter in the attached gas is close to gas input end one side is equipped with first gas extrusion district, first gas extrusion district is used for extrudeing the gas of input, first gas extrusion district one end is equipped with the gas and presses the district slowly to strengthen the pipe wall to the adhesion of particulate matter in the gas, the other end in gas and pressing the district is equipped with first residence zone, the other end in first residence zone is equipped with the second and stops the district, so that gas at each residence zone temporarily stops, the other end in second residence zone is equipped with the second gas extrusion district, the second gas extrusion district is used for holding back the particulate matter in the gas, the other end in second gas extrusion district is equipped with the gas output district to accelerate gas discharge.

Furthermore, the end with the small inner diameter of the corrugated pipe wall is a gas input end, the end with the large inner diameter of the corrugated pipe wall is a gas output end, the pipe wall is close to the gas input end and is provided with a first arc section, one end, away from a port of the gas input end, of the first arc section is connected with a second arc section, the other end of the second arc section is connected with a third arc section, the other end of the third arc section is connected with a fourth arc section, the other end of the fourth arc section is connected with a fifth arc section, and the other end of the fifth arc section is connected with a sixth arc section.

Further, the first arc segment shape is provided with a first arc segment shape curve formula, as follows,

Y1＝R/8×sin(7π/2L×x)

wherein R is the maximum inner diameter of the pipeline, L is the length of the pipeline, Y1 is the dependent variable of the first arc section, x is the independent variable, x is more than or equal to 0 and less than L/7, wherein,

when the shape of the inner wall is set according to the first arc section shape curve formula, a plane rectangular coordinate system is established at the edge of any port of the pipe wall by taking the position R/8 away from the pipe wall as the origin of coordinates, the axial direction of the pipe as the x axis and the radial direction of the pipe as the y axis, and the first arc section shape of the inner wall is set according to the first arc section shape curve formula.

Further, the second arc segment shape is provided with a second arc segment shape curve formula, as follows,

Y2＝R/8×sin(7π/4L×x+1/7×L)

in the formula, Y2 is a dependent variable of the second arc segment, x is an independent variable, and L/7 is more than or equal to x and is less than L multiplied by 3/7. Further, the third arc segment shape is provided with a third arc segment shape curve formula, as follows,

Y3＝R/8×sin(7π/2L×x-1/7×L)

in the formula, Y3 is a dependent variable of the third arc segment, x is an independent variable, and L x 3/7 is more than or equal to x and less than L x 4/7. Further, the fourth arc segment shape is provided with a fourth arc segment shape curve formula, as follows,

Y4＝R/8×sin(7π/4L×x+3/7×L)

in the formula, Y4 is a dependent variable of the third arc segment, x is an independent variable, and L x 4/7 is more than or equal to x and less than L x 5/7. Further, the fifth arc segment shape is provided with a fifth arc segment shape curve formula, as follows,

Y5＝R/8×sin(7π/2L×x-1/7×L)

in the formula, Y5 is a dependent variable of the third arc segment, x is an independent variable, and L x 5/7 is more than or equal to x and less than L x 6/7. Further, the sixth arc segment shape is provided with a sixth arc segment shape curve formula, as follows,

Y6＝R/4×sin(7π/4L×x-1/7×L)-1/8×R

in the formula, Y6 is a dependent variable of the third arc segment, x is an independent variable, and L is multiplied by 6/7 and is not less than x and not more than L.

Compared with the prior art, the corrugated pipe flexible joint has the advantages of high flexibility, heat preservation, corrosion resistance, good sealing property and long service life; the corrugated pipe main body can effectively reinforce the connection between the corrugated pipe main body and the metal outer ring with the protective cover through the arrangement of the straight edge section, the metal winding pipe is embedded in the inner wall of the corrugated pipe main body, and the outer surface of the metal winding pipe is wrapped with the knitted filter screen to form a heat insulation layer, so that the temperature of gas passing through a pipeline is reduced, meanwhile, the adhesion to particles is increased, the pollution of the discharged gas is reduced, and the treatment efficiency of automobile exhaust is improved.

Particularly, the inner wall of the corrugated pipe is shaped as a sine function curve, and the sine function has a wave crest and a wave trough, which can extrude the gas passing through the wave crest and make the extruded gas stay at the wave trough, so as to collect suspended particles in the gas, in this embodiment, when a first arc section shape curve formula is set, an angular velocity is set according to a pipe length L, the greater the angular velocity is, the greater the radian of the first arc section is, so that the air extrusion degree is greater, while the first arc section length is 1/7L, by controlling the amplitude and the angular velocity, the radian of the first arc section can be accurately controlled, so that the air extrusion degree meets the requirement, and the distance between the wave troughs can be effectively controlled by controlling the amplitude, in order to prevent the gas transmission from being influenced by the too small distance between the wave troughs, the distance between the wave troughs is controlled to be half of the pipe diameter, so that the air extrusion is met, and the gas transmission efficiency is not influenced, and gas fully contacts with the pipe wall of the first arc section in the extrusion process, so that the adhesion efficiency of the pipe wall to particulate matters in the gas can be effectively improved, and the treatment efficiency of automobile exhaust is further improved.

Particularly, when the second arc section curve formula is set, compared with the first arc section, the length of the second arc section is increased by keeping the amplitude unchanged, so that the radian reduction length of the second arc section is increased, the staying area of air in the first wave trough is increased, the adhesion efficiency of the pipe wall to particles in the air is improved, and the treatment efficiency of automobile exhaust is further improved.

Particularly, when the third arc section curve formula is set, compared with the second arc section, the method ensures that the radian of the third arc section is increased and reduced by keeping the amplitude unchanged and reducing the length of the third arc section, so that the staying area of air in the first wave trough is increased, the adhesion efficiency of the pipe wall to particles in the gas is further improved, and the treatment efficiency of automobile exhaust is improved.

Particularly, when the fourth arc section curve formula is set, compared with the third arc section, the radian of the fourth arc section is reduced by keeping the amplitude unchanged, so that the radian of the fourth arc section with unchanged length is reduced, the air flow speed is reduced, the retention time of air in the first trough is prolonged, the adhesion efficiency of the pipe wall to particles in the air is further improved, and the treatment efficiency of automobile exhaust is improved.

Particularly, when the fifth arc section curve formula is set, compared with the fourth arc section, the arc length of the fifth arc section is increased by keeping the amplitude unchanged and increasing the radian of the fifth arc section, so that the air flow speed is reduced, the retention time of air in the first trough is increased, and meanwhile, the gas is extruded in the second trough, so that the adhesion efficiency of the pipe wall to particles in the gas is further improved, and the treatment efficiency of automobile exhaust is improved.

Particularly, when the sixth arc section curve formula is set, compared with the fifth arc section, the radian of the fifth arc section is increased by increasing the amplitude and increasing the length of the fifth arc section, so that the air discharge speed is increased, the transmission efficiency of gas in the pipe wall is improved, and the treatment efficiency of automobile exhaust is improved.

Particularly, when the angular velocity in the shape curve formula is set, the method is further set according to the length L of the pipeline, in order to ensure that two wave crests and two wave troughs exist in the shapes of the inner walls of the corrugated pipes with different lengths, a sine function period is set according to the length L to ensure that the shapes of the inner walls are not influenced by the length of the pipeline, and the angular velocity in the shape curve formula is set through calculation, so that the inner walls of the corrugated pipes with different lengths all reach the shapes described in the embodiment, and the treatment efficiency of automobile exhaust is further improved.

Particularly, the shape of the inner wall from the gas input end to the gas output end is provided with two wave crests, after the gas is input, the gas is extruded through the first wave crest to enable the gas to form temporary stay at the first wave trough, so that particles in the gas are attached to the inner wall, the gas is extruded again through the second wave crest to further enhance the attachment of the particles in the gas, the outermost layer of the inner wall is a metal knitted filter screen which can effectively intercept the particles in the gas, so that the treatment efficiency of automobile exhaust is improved, in addition, when the original point of the inner wall shape curve is set, the inner diameter of the gas input end is reduced through increasing the wall thickness, so that the gas rapidly passes through the first wave crest position, so that the particles in the gas are attached at the first wave trough position, the cleaning efficiency of the gas is improved, and the attachment of the particles in the gas can be further enhanced through setting the long and complete wave troughs, thereby further improving the treatment efficiency of the automobile exhaust.

Drawings

Fig. 1 is a schematic structural view of a corrugated pipe for a commercial vehicle in country vi of this embodiment;

FIG. 2 is a schematic view showing the inner wall shape of a bellows for a commercial vehicle in this example, country VI.

Detailed Description

In order that the objects and advantages of the invention will be more clearly understood, the invention is further described below with reference to examples; it should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and do not limit the scope of the present invention.

It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, which are only for convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Please refer to fig. 1, which is a schematic structural diagram of a bellows for a commercial vehicle in country vi of the present embodiment, the bellows includes,

bellows main part 1, its both ends are equipped with the straight limit section, the inner wall of bellows main part 1 inlays and is equipped with metal winding pipe 3, metal winding pipe 3 surface evenly wraps up metal knitting filter screen 2 to form the heat conduction that the heat preservation reduced the body, metal knitting filter screen 2 still is used for the particulate matter in the attached gas, the port department of bellows main part 1 is equipped with metal neck ring 5, with metal winding pipe 3 port with the port of bellows main part 1 is fixed, the port department of bellows main part 1 still is equipped with the metal outer loop 6 of taking the safety cover to prevent that bellows main part 1 both ends transition wave from colliding with, because the effect of bellows both ends atress easily forms transition wave and collides with in the use, can effectively avoid colliding with the influence through setting up the metal outer loop 6 of taking the safety cover, the outer port of metal outer loop 6 is connected with metal flange 4, the metal flange 4 is used for connecting with an exhaust manifold or a silencer.

Specifically, in this embodiment, when the metal winding pipe is embedded in the bellows main body, the metal winding pipe in a fully compressed state is firstly cut to a required assembly size, after the cutting, the metal knitted filter screen is uniformly covered outside the metal winding pipe in a semi-stretched state, and the covered metal winding pipe is fixed in the inner circles of the straight edge sections at the two ends of the bellows main body through the metal inner lining ring and the metal outer ring with the protective cover.

Particularly, in this embodiment the bellows main part is through setting up being connected between the metal outer loop that the straight side section can effectively consolidate and take the safety cover, and this embodiment is still the inner wall of bellows main part inlays and establishes metal winding pipe, and the surface parcel knitting filter screen at metal winding pipe simultaneously to this forms the heat preservation, cools down to the gas through the pipeline, has increased the adhesion to the particulate matter simultaneously, in order to reduce exhaust gas's pollution, thereby improves the treatment effeciency to automobile exhaust, and this embodiment is passed through the port department of bellows main part sets up the metal outer loop of taking the safety cover, can effectively protect bellows main part both ends transition wave, prevents that the transition wave from leading to the fact because of colliding with the bellows damages, thereby improves the treatment effeciency to automobile exhaust.

Fig. 2 is a schematic view showing the inner wall shape of the bellows for the commercial vehicle in country vi of the present embodiment, wherein,

the pipe wall of bellows comprises different segmental arcs to particulate matter in the attachment gas, the one end that the pipe wall internal diameter is little is the gas input end, and the one end that the pipe wall internal diameter is big is the gas output end, and the pipe wall is close to the gas input end is equipped with first segmental arc 11, the one end that the gas input end port was kept away from to first segmental arc 11 is connected with second segmental arc 12, the other end and the third segmental arc 13 of second segmental arc 12 are connected, the other end and the fourth segmental arc 14 of third segmental arc 13 are connected, the other end and the fifth segmental arc 15 of fourth segmental arc 14 are connected, the other end and the sixth segmental arc 16 of fifth segmental arc 15 are connected, change the gas flow through setting up unevenness's pipe wall and can improve gaseous cleaning efficiency.

With continued reference to fig. 2, a first gas squeezing area 101 is formed near the gas input end by the first arc 11, the first gas squeezing area 101 is configured to squeeze the input gas to form a cyclone by convection of the squeezed gas, a gas buffer 102 is formed by the second arc 12, the gas flows into the gas buffer 102 after being squeezed, the adherence of the particulate matter in the gas to the pipe wall can be further enhanced by the gas buffer, a first retention area 103 is formed by the third arc 13, a second retention area 104 is formed by the fourth arc 14, the gas flows into the retention areas for temporary retention after passing through the gas buffer 102, a second gas squeezing area 105 is formed by the fifth arc 15, after the gas flows into the second gas extrusion area 105, the particles in the gas can be further trapped by extrusion, and meanwhile, by arranging the sixth arc section 16 to form a gas output area 106, the gas can be discharged through the gas output area 106 in an accelerated manner.

Specifically, the present embodiment is provided with a first arc segment shape curve formula, as follows,

Y1＝R/8×sin(7π/2L×x)

Specifically, in this embodiment, the shape of the inner wall of the bellows is a sine function curve, a peak and a trough exist in the inner side wall satisfying the sine function, when the gas circulates, the gas passing through the peak can be extruded, and the extruded gas stays at the trough, so as to facilitate collection of suspended particles in the gas, in this embodiment, when the shape of the first arc-shaped curve is set, the angular velocity of the shape curve is set according to the length L of the pipeline, the greater the angular velocity is, the greater the radian of the first arc-shaped section is, so that the extruded degree of the air is greater, and the first arc-shaped section is 1/7L, by controlling the amplitude and the angular velocity, the radian of the first arc-shaped section can be accurately controlled, so that the extruded degree of the air satisfies the requirement, and the distance between troughs can be effectively controlled by controlling the amplitude, in order to prevent the distance between the troughs from affecting the gas transmission, the distance between the troughs is controlled to be half of the pipe diameter, both satisfied the extrusion to the air, do not influence gaseous transmission efficiency again, and gaseous fully contact with the pipe wall of first segmental arc in extrusion process, can effectively improve the pipe wall to the adhesion efficiency of particulate matter in the gas to further improve the treatment effeciency to automobile exhaust.

Specifically, the present embodiment further provides a second arc segment shape curve formula, as follows,

Y2＝R/8×sin(7π/4L×x+1/7×L)

in the formula, Y2 is a dependent variable of the second arc segment, x is an independent variable, and L/7 is more than or equal to x and is less than L multiplied by 3/7.

Particularly, when setting up second segmental arc curve formula in this embodiment, compare with first segmental arc, through keeping the unchangeable second segmental arc length that increases of amplitude, make second segmental arc radian reduce length increase to increase the area that stops of air at first trough, with the adhesion efficiency of improvement pipe wall to particulate matter in the gas, thereby further improve the treatment effeciency to automobile exhaust.

Specifically, the present embodiment is further provided with a third arc segment shape curve formula, as follows,

Y3＝R/8×sin(7π/2L×x-1/7×L)

in the formula, Y3 is a dependent variable of the third arc segment, x is an independent variable, and L x 3/7 is more than or equal to x and less than L x 4/7.

Particularly, when setting up third segmental arc curve formula in this embodiment, compare with the second segmental arc, through keeping the amplitude unchangeable to reduce third segmental arc length, make third segmental arc radian increase length reduce, thereby increase the stay area of air at first trough, with the adhesion efficiency of further improvement pipe wall to particulate matter in the gas, thereby improve the treatment effeciency to automobile exhaust.

Specifically, the present embodiment is further provided with a fourth arc segment shape curve formula, as follows,

Y4＝R/8×sin(7π/4L×x+3/7×L)

in the formula, Y4 is a dependent variable of the third arc segment, x is an independent variable, and L x 4/7 is more than or equal to x and less than L x 5/7.

Specifically, when the fourth arc curve formula is set up in this embodiment, compare with the third arc, through keeping the amplitude unchangeable to reduce the fourth arc radian, make the unchangeable radian of fourth arc length reduce, with the speed of slowing down air flow here, thereby increase the dwell time of air at first trough, with the adhesion efficiency of further improvement pipe wall to particulate matter in the gas, thereby improve the treatment effeciency to automobile exhaust.

Specifically, the present embodiment is further provided with a fifth arc segment shape curve formula, as follows,

Y5＝R/8×sin(7π/2L×x-1/7×L)

in the formula, Y5 is a dependent variable of the third arc segment, x is an independent variable, and L x 5/7 is more than or equal to x and less than L x 6/7.

Specifically, when setting up the fifth arc curve formula in this embodiment, compare with the fourth arc, through keeping the amplitude unchangeable to increase the fifth arc radian, make the unchangeable radian of fifth arc length increase, in order to slow down here air flow velocity, thereby increase the dwell time of air at first trough, and this embodiment the bellows is cylindric, and gas can 360 degrees stops along the pipe wall at first trough department, makes the pipe wall reach the biggest to the particulate matter adhesion efficiency in the gas, extrudees through making gas at the second trough simultaneously, with the adhesion efficiency of further improvement pipe wall to particulate matter in the gas, thereby improves the treatment effeciency to automobile exhaust.

Specifically, the present embodiment further provides a sixth arc segment shape curve formula, as follows,

Y6＝R/4×sin(7π/4L×x-1/7×L)-1/8×R

Specifically, in the present embodiment, when the sixth arc curve formula is set, compared with the fifth arc, the amplitude is increased and the length of the fifth arc is increased, so that the radian of the fifth arc is increased to increase the air exhaust speed, thereby improving the transmission efficiency of the gas in the pipe wall and improving the treatment efficiency of the automobile exhaust.

Specifically, in the present embodiment, when setting each parameter in each of the shape curve formulas, by setting the amplitude of the sine function according to the maximum inner diameter R of the pipeline, the distance between the wave troughs can be effectively ensured to meet the gas input requirement, and in the present embodiment, by setting the amplitude of the sine function to R/8, the distance between the wave troughs can be effectively ensured to be R/2, and the requirement of extruding gas by different pipe diameters can be met, it can be understood that, a person skilled in the art can also modify the amplitude according to the actual pipe diameter size, such as R/4, R/6, etc., when the amplitude is larger, the distance between the wave troughs is smaller, and therefore, the distance between the wave troughs can also be reduced by adjusting the amplitude, so as to increase the attachment area of the gas when the wave troughs stay, but it should be noted that when the distance between the wave troughs is too small, the gas discharge efficiency will be affected, and the present embodiment sets the amplitude to be R/8 as the best implementation, the gas exhaust is satisfied, and meanwhile, the adhesion efficiency of the particles is increased, so that the treatment efficiency of the automobile exhaust is further improved.

Specifically, in this embodiment, when the angular velocity in the shape curve formula is set, the setting is further performed according to the length L of the pipeline, and in order to ensure that the inner wall shapes of the corrugated pipes with different lengths all have two peaks and two troughs, in this embodiment, a sine function period is set according to L to ensure that the inner wall shapes are not affected by the length of the pipeline, and the angular velocity in the shape curve formula is set through calculation, so that the inner walls of the corrugated pipes with different lengths all reach the shapes described in this embodiment, thereby further improving the efficiency of processing the automobile exhaust.

Specifically, in this embodiment, the shape of the inner wall from the gas input end to the gas output end is provided with two wave crests, after the gas is input, the gas is extruded through the first wave crest to enable the gas to temporarily stay at the first wave trough, so that the particulate matters in the gas are attached to the inner wall, the gas is further extruded through the second wave crest to further enhance the attachment of the particulate matters in the gas, the outermost layer of the inner wall is a metal knitted filter screen, the particulate matters in the gas can be effectively intercepted, the treatment efficiency of the automobile exhaust gas is improved, in addition, when the original point of the inner wall shape curve is set, the inner diameter of the gas input end is reduced by increasing the wall thickness, so that the gas rapidly passes through the first wave crest position, the particulate matters in the gas are retained at the first wave trough position to be attached, the cleaning efficiency of the gas is improved, and the attachment of the particulate matters in the gas can be further enhanced by setting the lengthy and complete wave trough, thereby further improving the treatment efficiency of the automobile exhaust.

Specifically, in the present embodiment, the corrugated pipe body and the metal winding pipe are both made of 321 stainless steel, which has good high temperature resistance and corrosion resistance; the knitted filter screen, the metal inner lining ring, the metal outer ring with the protective cover and the metal flange are all made of 304 stainless steel, so that the process scheme that the traditional corrugated pipe flange for the commercial vehicle needs paint spraying is broken, a series of links such as flange phosphorization, paint film detection and salt spray test are omitted, and the detection and test cost is reduced; the metal outer ring with the protective cover is made of 304 stainless steel, paint spraying is not needed, paint film detection and salt spray corrosion resistance tests are not needed, the product test cost can be effectively reduced, the material performance is improved, when the metal outer ring is machined, the whole steel plate is punched, no welding line exists, and the problem that the corrugated pipe is damaged due to cracking of the outer ring welding line can be effectively solved.

The metal outer ring with the protective cover of the embodiment is compared with a normal outer ring as follows:

TABLE 1

So far, the technical solutions of the present invention have been described in connection with the preferred embodiments shown in the drawings, but it is apparent to those skilled in the art that the scope of the present invention is not limited to these specific embodiments. Equivalent changes or substitutions of related technical features can be made by those skilled in the art without departing from the principle of the invention, and the technical scheme after the changes or substitutions can be within the protection scope of the invention.

Claims

1. The corrugated pipe for the national VI commercial vehicle is characterized by comprising,

the corrugated pipe comprises a pipe wall and a first arc section, wherein the pipe wall comprises different arc sections to form different areas so as to attach particles in gas, the end of the corrugated pipe with the small inner diameter is a gas input end, the end of the corrugated pipe with the large inner diameter is a gas output end, the pipe wall is provided with the first arc section close to the gas input end, the end, far away from the gas input end, of the first arc section is connected with the second arc section, the other end of the second arc section is connected with the third arc section, the other end of the third arc section is connected with the fourth arc section, the other end of the fourth arc section is connected with the fifth arc section, and the other end of the fifth arc section is connected with the sixth arc section;

a first gas extrusion area is arranged on one side close to the gas input end and used for extruding input gas, a gas buffer area is arranged at one end of the first gas extrusion area to enhance the adhesion of the pipe wall to particulate matters in the gas, a first retention area is arranged at the other end of the gas buffer area, a second retention area is arranged at the other end of the first retention area to enable the gas to temporarily retain in each retention area, a second gas extrusion area is arranged at the other end of the second retention area to retain the particulate matters in the gas, and a gas output area is arranged at the other end of the second gas extrusion area to accelerate the gas emission;

the first arc segment shape is provided with a first arc segment shape curve formula, as follows,

Y1=R/8×sin（7π/2L×x）

2. The bellow as recited in claim 1, wherein the second arcuate segment shape defines a second arcuate segment shape curve equation as follows,

Y2=R/8×sin（7π/4L×x+1/7×L）

3. The bellow as recited in claim 1, wherein the third arcuate segment shape defines a third arcuate segment shape curve formula, as follows,

Y3=R/8×sin（7π/2L×x-1/7×L）

4. The bellow as recited in claim 1, wherein the fourth arcuate profile defines a fourth arcuate profile curve formula, as follows,

Y4=R/8×sin（7π/4L×x+3/7×L）

5. The bellow as recited in claim 1, wherein the fifth arcuate profile defines a fifth arcuate profile curve formula, as follows,

Y5=R/8×sin（7π/2L×x-1/7×L）

6. The bellow as recited in claim 1, wherein the sixth arcuate profile defines a sixth arcuate profile curve formula, as follows,

Y6=R/4×sin（7π/4L×x-1/7×L）-1/8×R