CN103216687A - Dual tube and connecting structure thereof - Google Patents
Dual tube and connecting structure thereof Download PDFInfo
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- CN103216687A CN103216687A CN2012100172719A CN201210017271A CN103216687A CN 103216687 A CN103216687 A CN 103216687A CN 2012100172719 A CN2012100172719 A CN 2012100172719A CN 201210017271 A CN201210017271 A CN 201210017271A CN 103216687 A CN103216687 A CN 103216687A
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- pipe
- outer tube
- interior pipe
- sidewall
- dual
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Abstract
The invention provides a dual tube and a connecting structure thereof. When a common part of an outer tube and an inner tube undergoes stamping perforation processing for connecting the inner tube, defective conditions caused by stamping of waste materials are avoided. An inner tube (12) is arranged inside an outer tube (11); parts of the outer tube (11) and the inner tube (12) are unified into a whole; the inner tube (12) is provided with side walls (121) extending oppositely in parallel from a common part (13) of the outer tube (11) and the inner tube (12) with the diameter direction of the outer tube (11) between the side walls; and the depth end of the side wall (121) and opposite depth walls (122) of the common part (12) of the outer tube (11) and the inner tube (12) are not expanded to a degree exceeding the space between the side walls (121).
Description
Technical field
The invention belongs to relate in outer tube inside sets pipe and in outer tube and interior pipe respectively circulation dual pipe that fluids such as liquid, gas are arranged with and the technical field of linkage structure.
Background technique
Recently,, popularize dual pipe, the relative configuration structure of outer tube and interior pipe has been attempted various improvement at large-scale industrial field in order to make the circulation path compactness of fluid.
In the prior art, as dual pipe, for example known formation that record in patent documentation 1 is arranged.
In patent documentation 1, recorded and narrated sheet metal has been carried out bending and with outer tube and the interior tubular dual pipe that becomes one.
In the dual pipe of patent documentation 1, the part of outer tube and interior pipe is changed jointly, has reduced the manufactured materials amount, and manufacture cost reduces.In addition, by processing that the common ground of outer tube and interior pipe is bored a hole, internally the direction of Guan Xiangyu axle direction quadrature is carried out the connection of direct branch.
The prior art document
Patent documentation
Patent documentation 1: Japan opens clear 48-57715 communique in fact
Summary of the invention
The problem that invention will solve
In the dual pipe of patent documentation 1, branch's connection for pipe in carrying out, add man-hour utilizing the impact style do not produce smear metal that the common ground of outer tube and interior pipe is bored a hole, there is following problem: under the little situation of interior pipe, because stampings conflicts with interior pipe, thus in pipe sustain damage because of stampings or the stampings crimping be fixed in the pipe can not remove; Under the big situation of interior pipe, because stampings is managed inner corner, the trouble so the removal of stampings becomes in being hidden in.And then, connect in order to carry out branch, near the hole of having offered inaccessible in during the port of pipe, have following problem: the hole of having offered with by the port of the interior pipe of obturation between the useless space of formation, retention or interference can take place in fluid, so can damage fluid flow.
The present invention considers these problems and makes, and first problem provides the punching type perforation that the branch of pipe in the common ground to outer tube and interior pipe is used for is connected and adds the dual pipe that does not produce the undesirable condition that causes because of stampings man-hour.In addition, second problem provides the linkage structure that the interior pipe that does not damage the dual pipe that fluid flow just can be have easily been changed jointly to the part of outer tube and interior pipe carries out the dual pipe that branch is connected.
Solve the means of problem
In order to solve the first above-mentioned problem, dual pipe of the present invention adopts following means, it is characterized in that, this dual pipe sets interior pipe in the inside of outer tube, the part of outer tube and interior pipe is changed jointly and is formed as one, in this dual pipe, interior pipe has sidewall, this sidewall from the common ground of outer tube and interior pipe abreast in opposite directions and extend across the diametric(al) of outer tube, the depth wall of facing mutually at the depth end and the common ground of outer tube and interior pipe of sidewall is not reached degree above the interval of sidewall by expansion.
In these means, has the sidewall that extends abreast across the diametric(al) of outer tube by interior pipe, to guide to depth direction swimmingly by common ground generation and the bulged-in stampings of the punching type perforation processing of moving with sidewall from outer tube and interior pipe in the diametric(al) of outer tube, thereby can avoid conflict, depth wall by interior pipe is not reached degree above the interval of sidewall by expansion, can prevent the stampings that is directed be hidden in the inner corner of pipe.
In addition, about these means, the section shape of the depth wall of interior pipe is formed the semicircle of protruding laterally, pipe is equipped with respect to the resistance to pressure at the fluid of internal circulation in can making.In addition, the outer side surface of the sidewall of interior pipe and the boundary portion of outer tube are formed curved surface, can not form close gap at the sidewall of interior pipe and the boundary portion of outer tube.
In order to solve the second above-mentioned problem, the linkage structure of dual pipe of the present invention adopts following means, it is characterized in that, the joint structure of this dual pipe connects dual pipe, this dual pipe sets interior pipe in the inside of outer tube, the part of outer tube and interior pipe is changed jointly and is formed as one, interior pipe has sidewall, this sidewall also extends across the diametric(al) of outer tube abreast in opposite directions from the common ground of outer tube and interior pipe, the depth wall of facing mutually at the depth end of sidewall and the common ground of outer tube and interior pipe is not reached degree above the interval of sidewall by expansion, wherein, common ground at outer tube and interior pipe is offered the hole that is connected usefulness, the hole becomes in a part and has the not incomplete hole of offering of cutout portion, and the cut off machine that has formed the hole extends in the outstanding mode in inside from the inside pipe of common ground of outer tube and interior pipe.
In these means, formed branch at interior pipe to connect the cut off machine in hole of usefulness outstanding from the inside of the inside pipe of common ground of outer tube and interior pipe by making, cut off machine stop up be formed at the hole offered with by the space between the port of obturation, as the current plate performance function of the delay that prevents fluid, interference.In addition, form tunnel shape by interior pipe by sidewall and depth wall, offering under the situation in the hole that connects usefulness by punching type perforation processing, cut off machine is guided swimmingly by sidewall and has avoided to depth direction and the conflicting of each one of interior pipe, and more being expanded the depth wall of opening has not avoided forming useless gap by comparing sidewall.
In addition,, cut off machine is tilted with the fluid flow upstream side that the axis with respect to the hole forms the inside pipe of mode of acute angle, can guide the fluid that in interior pipe, circulates swimmingly in the hole that connects usefulness about these means.In addition, sidewall and the depth wall butt by making cut off machine and interior pipe also implemented soldering, can fully stop up the space substantially by cut off machine.
The effect of invention
Dual pipe of the present invention, has the sidewall that extends abreast across the diametric(al) of outer tube by interior pipe, guide swimmingly to depth direction processing from the common ground generation and the bulged-in stampings of outer tube and interior pipe by sidewall by the punching type perforation of moving in the diametric(al) of outer tube, thereby can avoid conflict, depth wall by interior pipe is not reached degree above the interval of sidewall by expansion, can prevent that the stampings that is directed is hidden in the inner corner of interior pipe, so the punching type that the branch of pipe is connected in the common ground to outer tube and interior pipe is used for perforation adds man-hour, has the effect that can not produce the undesirable condition that causes because of stampings.
The linkage structure of dual pipe of the present invention, the linkage structure of the dual pipe of patent documentation 1 is applicable to the connection of interior pipe of the dual pipe of patent documentation 2, to have formed the cut off machine in the hole that connects usefulness at interior pipe outstanding from the inside of the inside pipe of common ground of outer tube and interior pipe by making, cut off machine stops up and to be formed at the hole offered and by the space between the inaccessible port, as the delay that prevents fluid, the current plate performance function of disturbing is carried out the effect that branch is connected so have the interior pipe of the dual pipe that the circulation of not damaging fluid just can be have easily been changed jointly to the part of outer tube and interior pipe.In addition, form tunnel shape by interior pipe by sidewall and depth wall, offering under the situation in the hole that connects usefulness by punching type perforation processing, because cut off machine is guided swimmingly by sidewall and has avoided to depth direction and the conflicting of each one of interior pipe, more do not expanded the depth wall open and avoided forming useless gap by comparing sidewall, thus have in carrying out punching type perforation processing can be exactly the inside effect of the inner inclination of pipe ground configuration cuts sheet.
Description of drawings
Fig. 1 is the plan view (comprising partial enlarged drawing) of first example that is used to implement the mode of execution of dual pipe of the present invention.
Fig. 2 is the stereogram of the Production Example of presentation graphs 1.
Fig. 3 is the sectional view of the perforation processing example of Fig. 1, (A) represents preperforative state, (B) state in the expression perforation procedure.
Fig. 4 is the sectional view of the routine perforation finishing stage of the perforation processing of Fig. 1.
Fig. 5 is the plan view of second example that is used to implement the mode of execution of dual pipe of the present invention.
Fig. 6 is the longitudinal section of mode of execution that is used to implement the linkage structure of dual pipe of the present invention.
Fig. 7 is the X-X line sectional view of Fig. 1.
Fig. 8 is the stereogram of the perforation processing example of Fig. 6.
Fig. 9 is the amplification longitudinal section of Fig. 8.
Embodiment
Below, based on accompanying drawing the mode of execution that is used to implement dual pipe of the present invention and linkage structure thereof is described.
At first, based on Fig. 1～Fig. 5 the mode of execution that is used to implement dual pipe of the present invention is described.
Fig. 1～Fig. 4 is the figure of first example of the expression mode of execution that is used to implement dual pipe of the present invention.
In first example, expression be suitable as on-vehicle air conditioner uses such as refrigerant passage form the smaller dual pipe of diameter.
As shown in Figure 1, the dual pipe 1 of first example is made of outer tube 11 and interior pipe 12.
As shown in Figure 2, outer tube 11 and interior pipe 12 are by being squeezed into the metallic material of the good aluminium series of heat transfer property straight shape and being formed as one by extrusion die (punch die) D, and pipe 12 is equipped on the shape of the inside of outer tube 11 in becoming.Under the situation about using as the refrigerant passage of on-vehicle air conditioner etc., the fluid of circulation is the gas that refrigeration agent has gasified in outer tube 11, and the fluid of circulation is the liquid of refrigeration agent in interior pipe 12.Therefore, outer tube 11 is low-voltage tubes, and interior pipe 12 is high-voltage tubes, but considers whole rigidity, sets the wall thickness b thick (with reference to Fig. 1) of the wall thickness a of outer tube 11 than interior pipe 12 for.
The section shape of outer tube 11 forms positive circle.
As indicated in Fig. 1, the section shape of interior pipe 12 forms tunnel shape.In pipe 12 tunnel shape form in the following manner: the part of the circular arc of outer tube 11 (common ground 13) as antetheca, sidewall 121 also extends across the diametric(al) of outer tube 11 abreast in opposite directions from common ground 13, at the depth end of sidewall 121, section shape is laterally the semicircular depth wall 122 of (depth direction) protrusion and faces mutually with common part 13.The boundary portion of the inner side surface 121a of sidewall 121 and common part 13 forms the little curved surface 14 as the required minimum curved surface of extrusion process.The outer side surface 121b of sidewall 121 and the boundary portion of outer tube 11 form the curved surface 15 bigger than little curved surface 14.
As shown in Figure 3, according to first example, under the situation of the punching type perforation processing that the branch of pipe 12 is connected in the common ground 13 to outer tube 11 and interior pipe 12 is used for, the drift P of the size in selecting certainly in the interval of the sidewall 121 of pipe 12.Shown in Fig. 3 (A), drift P carries out the punching press action from the diametric(al) of the lateral outer tube 11 of common ground 13, shown in Fig. 3 (B), offer hole 16 at common ground 13, being pressed into depth direction (depth wall 122 directions of interior pipe 12) along with offering the stampings 17 that the hole produces.
At this moment, because the boundary portion of the inner side surface 121a of the sidewall 121 of interior pipe 12 and common part 13 forms little curved surface 14, the cut-out stress of drift P is concentrated easily, so cut off common ground 13 easily, forms hole 16 effectively.In addition, slide at inner side surface 121a because the stampings 17 that is pressed into by drift P manages the guiding of 12 sidewall 121 in both sides are subjected to, thus in can not taking place pipe 12 by stampings 17 damages or stampings 17 be crimped be fixed in the situation of pipe 12.In addition, do not expanded the semicircle that reaches above the degree at the interval of sidewall 121 because be positioned at the depth wall 122 of the depth end of pipe 12 sidewall 121, thus stampings 17 can not be hidden in the internal corners of pipe 12.For this reason, as shown in Figure 4,, can wait by injection air and discharge stampings 17 simply making after drift P retreats.
Therefore, the punching type perforation that the branch of pipe 12 is connected in the common ground 13 of outer tube 11 and interior pipe 12 is used for adds man-hour, and the undesirable condition that causes because of stampings 17 can not take place.
And then, under the situation of using first example,, possess resistance to pressure, so can guarantee function effectively as the interior pipe 12 of high-voltage tube because the depth wall of interior pipe 12 122 is semicircle.
And then, because interior pipe 12 forms by the shape that supports depth walls 122 as the sidewall 121 of two legs, so even pipe 12 can ulceration yet in when carrying out pipe arrangement with twisting sth. made by twisting.Therefore, degree of gaining freedom in piping engineering.
And then, because the boundary portion of the outer side surface 121b of the sidewall 121 of interior pipe 12 and outer tube 11 forms curved surface 15, be the structure that does not form close gap S (with reference to Fig. 1), so do not hinder the circulation of the fluid of outer tube 11 inside.In addition, the sidewall 121 of pipe 12 was also brought into play anti-stubborn sth. made by twisting to the such pipe arrangement of above-mentioned stubborn sth. made by twisting in curved surface 15 was reinforced, the resistance to pressure of pipe 12 in also helping to improve.
And then, because can carry out branch and be connected internally managing 12 effectively with the direction of the axle direction quadrature of outer tube 11, thus in being connected in the degree of gaining freedom such as configuration of the pipe arrangement of the connecting tube of pipe 12 system or flange connector.
Fig. 5 is the figure of second example of the expression mode of execution that is used to implement dual pipe of the present invention.
Second example reduces the interior pipe 12 of first example, with respect to the center of outer tube 11 with three of radial configuration.
According to second example, can gather the circulation path of a plurality of fluids compactly.And, can more improve whole rigidity than first example, improve anti-stubborn sth. made by twisting.
Then, based on Fig. 6～Fig. 9 the mode of execution of the linkage structure that is used to implement dual pipe of the present invention is described.
As shown in Figure 6, this mode of execution is made of with the each several part of flange 4 dual pipe 1, interior effective connecting tube 2, outer effective connecting tube 3, connection.
As Fig. 8, shown in Figure 9, with respect to this dual pipe 1, in the common ground 13 to outer tube 11 and interior pipe 12 is used to be connected under the situation of pipe 12 punching type perforation processing, the drift P of the size in selecting certainly in the interval of the sidewall 121 of pipe 12.In addition, as the shape of the cut-out blade of drift P, secant plane is U font (with reference to Fig. 8), with the base portion Pa side of U font than the opening portion more outstanding mode of Pb side of U font tilt (with reference to Fig. 9).In addition, on the end limit of the opening portion of the U of drift P font Pb side, there is not to be provided with blade with cut-out function.
As shown in Figure 9, drift P carries out punching press action from the diametric(al) of the lateral outer tube 11 of common ground 13, offers the hole 16 that connects usefulness at common ground 13, along with the cut off machine 18 of offering the hole generation is pressed to depth direction (depth wall 122 directions of interior pipe 12).In addition, the opening portion Pb side of the U font of drift P is positioned at port one 11,123 sides of the connecting end that becomes outer tube 11 and pipe 12.
At this moment, because the boundary portion of the inner side surface 121a of the sidewall 121 of interior pipe 12 and common part 13 forms little curved surface 14, the cut-out stress of drift P is concentrated easily, so cut off common ground 13 easily, forms hole 16 effectively.This hole 16 is patent part sides of becoming U font (tongue-shaped, horse shoe shaped) and U font according to the shape of the cut-out blade of drift P etc. in the incomplete hole of offering that common ground 13 stays as cutout portion not.Therefore, along with offering this hole 16, pipe 12 in cut off machine 18 makes the base portion side of U font tilt with the patent part side with the U font as fulcrum mode is pressed into, outstanding in the inside of interior pipe 12.That is, cut off machine 18 is configured to acute angle with respect to the axis in hole 16, to the circulation upstream side inclination of the fluid that circulates at interior pipe 12.
In addition, because the cut off machine 18 that is pressed into by drift P is slided at inner side surface 121a by sidewall 121 guiding of interior pipe 12 in both sides, so the situation of pipe 12 in pipe 12 is fixed in by cut off machine 18 damages or cut off machine 18 crimping in can not taking place.In addition, in comparing, manage 12 sidewall 121 and more expanded the depth wall of opening 122 because become the base portion side of U font of the front end of the cut off machine 18 that is pressed into by drift P, so between cut off machine 18 and interior pipe 12, can not form useless gap.
Therefore, the perforation of the punching type of pipe 12 adds man-hour in the common ground 13 to outer tube 11 and interior pipe 12 is used to be connected, and can not produce the undesirable condition that causes because of cut off machine 18.
In addition, be pressed into the cut off machine 18 of interior pipe 12 and the sidewall 121 and depth wall 122 butts of interior pipe 12.For this reason, by implementing soldering, can form substantially block plug structure completely with respect to interior pipe 12.
As Fig. 6, shown in Figure 7, in the hole of offering 16, utilize soldering to connect interior effective connecting tube 2.Interior effective connecting tube 2 connects and is supported on and connects with flange 41.This connection is the technology of the linkage structure of known dual pipe itself, can implement easily.
And then the port one 23 of interior pipe 12 is crimped also soldering at outer tube 11 and common ground 13 by conquassation processing with circular-arc.Its result forms space 19 between the port one 23 of interior pipe 12 and above-mentioned cut off machine 18.This space 19 becomes the state of complete closed substantially.
And then in the port one 11 of outer tube 11, chimeric outer effective connecting tube 3 also utilizes soldering to connect.Connect and supporting in the connection of effective connecting tube 2 with on the flange 4, jointly connect and support effective connecting tube 3 outward.
When using this mode of execution, the fluid of effective connecting tube 2 is by cut off machine 18 guiding in circulation and the inflow in interior pipe 12, and travel direction is changed swimmingly.And, because be in the space 19 quilt cardinal principle complete closed at the back of cut off machine 18, so fluid can not be detained, disturb near cut off machine 18.Therefore, in circulating in, guaranteed the circulation of height in the fluid of pipe 12 and interior effective connecting tube 2.
Except above illustrated each example, also can change outer tube 11, the high-voltage tube of interior pipe 12, the low-voltage tube of dual pipe 1, also can suitably change wall thickness a, b thereupon.
And then the outer tube 11 that also goes for dual pipe 1 is non-orbicular situation.
And then, also can be made as the number of the interior pipe 12 of the outer tube 11 that is disposed at dual pipe 1 more than two or four.
And then, also can be set as semicircle shape in addition to the shape of the depth wall 122 of the interior pipe 12 of dual pipe 1.
And then, for the angle of inclination of cut off machine 18, can according to the recessed space 19 of port one 23 sides that form inside pipe 12, do not form the new delay portion of fluid scope (up to the angle of the parallel axes in hole 16) set.
Embodiment
Under the situation of mode of execution use that is used to implement dual pipe of the present invention and linkage structure thereof as the refrigerant passage of on-vehicle air conditioner, the external diameter of the outer tube 11 of dual pipe 1 is 19mm, wall thickness a is 1.2mm, the wall thickness of the interior pipe 12 of dual pipe 1 is 1.0mm, the inner side surface 121a of sidewall 121 is spaced apart 5mm, and the center of depth wall 122 is set in from the center of outer tube 11 and leaves on the position of 4.61mm.
Utilize possibility on the industry
Dual pipe of the present invention and linkage structure thereof also can go for forming the situation of sizable diameter for the purposes beyond the refrigerant passage that is used for on-vehicle air conditioner.
Claims (6)
1. dual pipe, it is characterized in that, this dual pipe sets interior pipe in the inside of outer tube, the part of outer tube and interior pipe is changed jointly and is formed as one, wherein, interior pipe has sidewall, this sidewall from the common ground of outer tube and interior pipe abreast in opposite directions and extend across the diametric(al) of outer tube, the depth wall of facing mutually at the depth end and the common ground of outer tube and interior pipe of sidewall is not reached degree above the interval of sidewall by expansion.
2. dual pipe as claimed in claim 1 is characterized in that, the section shape of the depth wall of interior pipe is the semicircle of protruding laterally.
3. dual pipe as claimed in claim 1 or 2 is characterized in that, the sidewall outer side surface of interior pipe and the boundary portion of outer tube form curved surface.
4. the linkage structure of a dual pipe, it is characterized in that, the linkage structure of this dual pipe connects dual pipe, this dual pipe sets interior pipe in the inside of outer tube, the part of outer tube and interior pipe is changed jointly and is formed as one, interior pipe has sidewall, this sidewall also extends across the diametric(al) of outer tube abreast in opposite directions from the common ground of outer tube and interior pipe, the depth wall of facing mutually at the depth end of sidewall and the common ground of outer tube and interior pipe is not reached degree above the interval of sidewall by expansion, wherein, common ground at outer tube and interior pipe is offered the hole that is connected usefulness, the hole becomes in a part and has the not incomplete hole of offering of cutout portion, and the cut off machine that has formed the hole extends in the outstanding mode in inside from the inside pipe of common ground of outer tube and interior pipe.
5. the linkage structure of dual pipe as claimed in claim 4 is characterized in that, cut off machine tilts with the fluid flow upstream side that the axis with respect to the hole forms the inside pipe of mode of acute angle.
6. as the linkage structure of claim 4 or 5 described dual pipes, it is characterized in that the sidewall of cut off machine and interior pipe and depth wall butt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210017271.9A CN103216687B (en) | 2012-01-19 | 2012-01-19 | Dual tube and connecting structure thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210017271.9A CN103216687B (en) | 2012-01-19 | 2012-01-19 | Dual tube and connecting structure thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103216687A true CN103216687A (en) | 2013-07-24 |
| CN103216687B CN103216687B (en) | 2015-07-22 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210017271.9A Active CN103216687B (en) | 2012-01-19 | 2012-01-19 | Dual tube and connecting structure thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103216687B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1258181A (en) * | 1968-03-05 | 1971-12-22 | ||
| JPS56103778U (en) * | 1980-01-09 | 1981-08-13 | ||
| JP2006069081A (en) * | 2004-09-03 | 2006-03-16 | Ashimori Ind Co Ltd | Divisional lining method for pipe line and structure of divisional pipe line |
| JP2006336788A (en) * | 2005-06-03 | 2006-12-14 | Calsonic Kansei Corp | Terminal structure and terminal processing method for double pipe |
| US20080060199A1 (en) * | 2006-07-25 | 2008-03-13 | Christopher Alfred Fuller | Method of manufacturing a manifold |
| CN201177111Y (en) * | 2008-03-26 | 2009-01-07 | 超众科技股份有限公司 | Metal pipe for hot pipe |
| CN201457486U (en) * | 2009-06-30 | 2010-05-12 | 上海同济同捷科技股份有限公司 | Novel car doorsill beam |
-
2012
- 2012-01-19 CN CN201210017271.9A patent/CN103216687B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1258181A (en) * | 1968-03-05 | 1971-12-22 | ||
| JPS56103778U (en) * | 1980-01-09 | 1981-08-13 | ||
| JP2006069081A (en) * | 2004-09-03 | 2006-03-16 | Ashimori Ind Co Ltd | Divisional lining method for pipe line and structure of divisional pipe line |
| JP2006336788A (en) * | 2005-06-03 | 2006-12-14 | Calsonic Kansei Corp | Terminal structure and terminal processing method for double pipe |
| US20080060199A1 (en) * | 2006-07-25 | 2008-03-13 | Christopher Alfred Fuller | Method of manufacturing a manifold |
| CN201177111Y (en) * | 2008-03-26 | 2009-01-07 | 超众科技股份有限公司 | Metal pipe for hot pipe |
| CN201457486U (en) * | 2009-06-30 | 2010-05-12 | 上海同济同捷科技股份有限公司 | Novel car doorsill beam |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103216687B (en) | 2015-07-22 |
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