CN208397485U - exhaust pipe connection structure and exhaust pipe assembly - Google Patents

Abstract

The utility model belongs to automotive field, it is related to a kind of exhaust pipe connection structure, including first flange, second flange and gasket, gasket includes circular heat-resisting silk weaving elastic gauze pad and the airtight and watertight padding layer on heat-resisting silk weaving elastic gauze pad, first flange is fixedly connected with second flange, and gasket is compressed between first flange and second flange；Further relate to a kind of exhaust pipe assembly, including downtake pipe, second exhaust pipe and aforementioned exhaust pipe connection structure；Downtake pipe is sealedly attached in first flange, and second exhaust pipe is sealedly attached in second flange；It is high to the processing request of flange to solve existing scheme, it is lower to flange surface planarity requirements the problem of waste of resource, flange difficulty of processing is reduced, and gasket can be reused after exhaust pipe connection structure is dismantled.

Description

Exhaust pipe connection structure and exhaust pipe assembly

Technical field

The utility model belongs to automobile technical field, more particularly to exhaust pipe connection structure and exhaust pipe assembly.

Background technique

Automobile exhaust system is the important component of automobile, and a critical function of exhaust system is by engine combustion Exhaust gas be rejected to outside vehicle.Exhaust system is limited due to production, assembly, disassembly, transport etc., needs to be divided into multistage, and each section Connection structure between exhaust pipe must assure that the air-tightness of exhaust system, cannot generate biggish leakage, otherwise lead to high temperature Gas, which is blown, to be hit onto the components on periphery, and the excessively high failure of component surface temperature is caused.

The exhaust pipe connection structure used in major part vehicle at present is two face-flange and is set to two face-flanges Between gasket, face-flange is planar structure, and gasket is double-layer stainless steel thin slice of the middle section with protrusion, is had Certain elasticity；When flange bolt is urgent, two face-flanges compress the protrusion on gasket, and the elastic force in protrusion guarantees sealing Pad is close to flange, to achieve the purpose that sealing.But such exhaust pipe connection structure needs flange plane with higher Otherwise degree is easy gas leakage, increase processing request, and such gasket is disposable exemplar, and (stainless steel must be replaced after dismantling When dismantling again after sheet hold down, protrusion has been not present, elastic force needed for not having sealing), waste of resource.

Summary of the invention

Technical problem to be solved in the utility model first is that:, wave high to the processing request of flange for existing scheme The problem of taking resource provide a kind of exhaust pipe connection structure.

In order to solve the above technical problems, the utility model embodiment provides a kind of exhaust pipe connection structure, including the first method Blue, second flange and gasket, the gasket include circular heat-resisting silk weaving elastic gauze pad and are set to the heat-resisting silk weaving Airtight and watertight padding layer on elastic gauze pad, described airtight and watertight padding layer a part are embedded in the mesh of the heat-resisting silk weaving elastic gauze pad Interior, remaining part is covered in the surface of the heat-resisting silk weaving elastic gauze pad, the first flange and the fixed company of the second flange It connects, and the gasket is compressed between the first flange and the second flange.

Optionally, the side towards the second flange of the first flange is equipped with annular protrusion；Second method Orchid is equipped with annular groove towards the side of the first flange, and the annular protrusion protrudes into the annular groove, described close For packing in the annular groove, the inner wall of the gasket corresponds to the outside wall surface of the annular protrusion, the gasket Outside wall surface correspond to the wall surface of the annular groove.

Optionally, two sides of the gasket respectively the side with the first flange towards the second flange with And the wall surface interference fit of the annular groove.

Optionally, the annular groove includes the first annular groove and the second annular groove set on first annular groove bottom, described First annular groove and second annular groove are combined into stepped groove；

One end of the gasket is located in first annular groove, and the other end is located in second annular groove, the annular Protrusion protrudes into second annular groove, the gasket be located at first annular groove in one end two sides respectively with institute State the wall surface interference fit of the side and first annular groove towards the second flange of first flange；The gasket The inner wall of one end being located in second annular groove be bonded with the outside wall surface of the annular protrusion, outside wall surface and described second The side wall surface of annular groove is bonded.

Optionally, the gasket includes air ring and the columnar projections on the air ring, the air ring pressure It shrinks between the side towards the second flange of the first flange and the wall surface of first annular groove, the column is convex It rises and protrudes into second annular groove.

Optionally, by round-corner transition between first annular groove and second annular groove, the section of the gasket is in Band fillet " 7 word " shape.

Optionally, the heat-resisting silk weaving elastic gauze pad is metal silk net pad, and the airtight and watertight padding layer is graphite linings.

Optionally, the gasket with a thickness of 2-4mm, positioned at the described close of the surface of the heat-resisting silk weaving elastic gauze pad The packing bed of material with a thickness of 0.2-0.5mm.

Exhaust pipe connection structure provided by the embodiment of the utility model utilizes the heat-resisting silk weaving elasticity for being covered with airtight and watertight padding layer Gauze pad plays gasket, and when gasket is compressed between first flange and second flange, airtight and watertight padding layer is simultaneously with first Flange and second flange fit closely realization sealing, lower to flange surface planarity requirements, reduce flange difficulty of processing；Sealing Recoverable deformation can occur for pad, can seal the gap of first flange and second flange and reuse after dismantling close Packing, save the cost are conducive to environmental protection.

Technical problem to be solved in the utility model second is that:, wave high to the processing request of flange for existing scheme The problem of taking resource provide a kind of exhaust pipe assembly.

In order to solve the above technical problems, the utility model embodiment additionally provides exhaust pipe assembly, including downtake pipe, Second exhaust pipe and aforementioned exhaust pipe connection structure；The downtake pipe is sealedly attached in the first flange, and described Two exhaust pipes are sealedly attached in the second flange.

Optionally, the downtake pipe is inserted into the interstitial hole of the first flange from the side for deviating from the annular protrusion It is interior, and the end of the downtake pipe is no more than the root of the annular protrusion；

The second exhaust pipe is inserted into the interstitial hole of the second flange from the side away from the annular groove, and institute The end for stating second exhaust pipe is no more than the wall surface of the annular groove；

The first flange and the second flange are cooperated by screw bolt and nut to be fastened.

Exhaust pipe assembly provided by the embodiment of the utility model, connects first exhaust using aforementioned exhaust pipe connection structure Pipe and second exhaust pipe can be avoided gas leakage at the gap between first flange and second flange, lower to flange surface plane The requirement of degree, easy to process, the gasket for sealing first flange and second flange is reusable, avoids the wasting of resources.

Detailed description of the invention

Fig. 1 is the structural schematic diagram of exhaust pipe connection structure provided by the embodiment of the utility model；

Fig. 2 is the B-B cross-sectional view of Fig. 1；

Fig. 3 is the structural schematic diagram of the gasket of exhaust pipe connection structure provided by the embodiment of the utility model；

Fig. 4 is the C-C cross-sectional view of Fig. 3；

Fig. 5 is the structural schematic diagram of the second flange of exhaust pipe connection structure provided by the embodiment of the utility model；

Fig. 6 is the D-D cross-sectional view of Fig. 5；

Fig. 7 is the structural schematic diagram of an exhaust pipe sub-unit provided by the embodiment of the utility model；

Fig. 8 is the E-E cross-sectional view of Fig. 7；

Fig. 9 is the structural schematic diagram of exhaust pipe assembly provided by the embodiment of the utility model；

Figure 10 is the F-F cross-sectional view of Fig. 9；

Figure 11 is the G-G cross-sectional view of Fig. 9.

Appended drawing reference in specification is as follows:

1, first flange；11, annular protrusion；12, bolt mounting holes；

2, second flange；21, annular groove；211, the first annular groove；212, the second annular groove；22, bolt mounting holes；

3, gasket；31, air ring；32, columnar projections；

5, bolt；6, nut；7, downtake pipe；8, second exhaust pipe.

Specific embodiment

The technical issues of in order to keep the utility model solved, technical solution and beneficial effect are more clearly understood, below In conjunction with accompanying drawings and embodiments, the utility model is described in further detail.It should be appreciated that specific reality described herein Example is applied only to explain the utility model, is not used to limit the utility model.

As shown in Figure 1 to Figure 2, exhaust pipe connection structure provided by the embodiment of the utility model, including first flange 1, Two flanges 2 and gasket 3, gasket 3 include circular heat-resisting silk weaving elastic gauze pad and are set on heat-resisting silk weaving elastic gauze pad Airtight and watertight padding layer, airtight and watertight padding layer a part be embedded in the mesh of heat-resisting silk weaving elastic gauze pad, and remaining part is covered in resistance to Heated filament knits the surface of elastic gauze pad, and first flange 1 is fixedly connected with second flange 2, and gasket 3 is compressed in 1 He of first flange Between second flange 2.Illustrate for simplified embodiment, subsequent flange refers to first flange 1 and second flange 2.

Exhaust pipe connection structure provided by the embodiment of the utility model utilizes the heat-resisting silk weaving elasticity for being covered with airtight and watertight padding layer Gauze pad plays gasket 3, when gasket 3 is compressed between first flange 1 and second flange 2, airtight and watertight padding layer simultaneously with First flange 1 and second flange 2 fit closely realization sealing, lower to flange surface planarity requirements, reduce flange difficult processing Degree；Recoverable deformation can occur for gasket 3, can seal the gap of first flange 1 and second flange 2 and after dismantling Recycling, save the cost are conducive to environmental protection.

In one embodiment, as shown in Fig. 2, the side towards second flange 2 of first flange 1 is equipped with annular protrusion 11；Second flange 2 offers annular groove 21 on the side towards first flange 1, annular protrusion 11 protrudes into annular groove 21, For gasket 3 in annular groove 21, the inner wall of gasket 3 corresponds to the outside wall surface of annular protrusion 11, the outside wall surface of gasket 3 The wall surface of corresponding annular groove 21.Wherein, the inner wall of gasket 3 refers to the inner ring face of gasket 3, and the outside wall surface of gasket 3 refers to The outer ring face of gasket 3, as gasket 3 be cylindrical-shaped structure when, the inner wall of gasket 3 refers to its inner radial surface, outside wall surface Refer to its radially-outer surface；Surface of the outside wall surface finger ring shape protrusion 11 of annular protrusion 11 away from the side of exhaust passage.

The setting of annular protrusion 11 and annular groove 21, is conducive to the positioning of gasket 3, and guarantee gasket 3 can with flange By fitting, while when avoiding gas from being discharged through exhaust passage again, impact gasket 3 causes the filler of airtight and watertight padding layer by steam flow band Exhaust pipe makes to form curved gap between first flange 1 and second flange 2, extends sealed pathway, and gasket 3 is logical enough Gas leakage is preferably blocked, guarantees good sealing effect.

In one embodiment, as shown in Fig. 2, two sides of gasket 3 are respectively with first flange 1 towards second flange Side and annular groove 21 wall surface interference fit, structure is simple, is easily assembled, and locks first flange 1 and second flange 2 When, gasket 3 by two flanges extruding and by compress it is thinning, formed sealing surface, have good sealing function.

In one embodiment, as shown in Figure 2, Figure 5 and Figure 6, annular groove 21 including the first annular groove 211 and is set to the first ring Second annular groove 212 of 211 bottom of slot, the first annular groove 211 and the second annular groove 212 are combined into stepped groove；

One end of gasket 3 is located in the first annular groove 211, and the other end is located in the second annular groove 212, and annular protrusion 11 protrudes into In second annular groove 212, two sides of the one end of gasket 3 being located in the first annular groove 211 respectively with first flange 1 towards The wall surface of the side of second flange 2 and the first annular groove 211 interference fit；The gasket is located in second annular groove The inner wall of one end be bonded with the outside wall surface of the annular protrusion, outside wall surface is bonded with the side wall surface of second annular groove.Knot Structure is simple, is easily assembled, and locks first flange 1 and when second flange 2, one end of gasket 3 annular protrusion 4 outside wall surface and First of sealing surface is formed between the side wall surface of second annular groove 212, the other end of gasket 3 is in first flange 1 towards second Telogenesis second sealing surface between the side of flange 2 and the wall surface of the first annular groove 211 is improved close by the two seals face Sealing property.

Certainly, gasket can also be only located in the first annular groove, and annular protrusion protrudes into the second annular groove, two sides of gasket (this gasket is arranged with the wall surface of the side and the first annular groove towards second flange of first flange interference fit respectively in face Scheme is not shown)；Lock first flange 1 and when second flange 2, gasket 3 by two flanges extruding and compressed it is thinning, Form one of sealing surface.

In one embodiment, as shown in Figure 2, Figure 3 and Figure 4, gasket 3 is including air ring 31 and on air ring 31 Columnar projections 32, air ring 31 are compressed in the wall surface of the side and the first annular groove 211 towards second flange 2 of first flange 1 Between, columnar projections 32 protrude into the second annular groove 212, and the inner wall of columnar projections 32 is close to the outside wall surface of annular protrusion 11, The outside wall surface of columnar projections 32 is close to the side wall surface of the second annular groove 212.Structure is simple, easy to process, assembly, 3 energy of gasket It is enough to be preferably bonded with first flange 1 and second flange 2, improve sealing performance.Since columnar projections 32 can't bear to answer greatly Power, therefore thin-walled protrusion can be used, not only facilitated processing, but also save materials.

Preferably, as shown in figures 2-6, annular protrusion 11 is circular ring shape protrusion 11, the first annular groove 211 and the second annular groove 212 For annular groove, air ring 31 is annulus pad, and columnar projections 32 are cylindrical projection, such gasket 3 can preferably with the first method Orchid 1 and second flange 2 are bonded, and improve sealing performance.

In one embodiment, as shown in figs. 2,4 and 6, pass through fillet between the first annular groove 211 and the second annular groove 212 Transition, the section of gasket 3 are in band fillet " 7 word " shape, are more advantageous to 3 deformation of gasket, and gasket 3 can be preferably with first Flange 1 and second flange 2 are bonded, while promoting the sealing performance at first of sealing surface and at second sealing surface.

In one embodiment, heat-resisting silk weaving elastic gauze pad is metal silk net pad, such as stainless pin knitmesh pad.Metal silk weaving Gauze pad has elasticity, and can keep stability under high temperature environment, advantageously ensures that the reliability of flange seal.

In one embodiment, airtight and watertight padding layer is graphite linings.Graphite linings can keep stability under high temperature environment, and have There is changeability, advantageously ensures that the reliability of flange seal.

In one embodiment, gasket 3 with a thickness of 2-4mm, be covered in the sealing on the surface of heat-resisting silk weaving elastic gauze pad Packing layer with a thickness of 0.2-0.5mm, the reasonable selection of gasket 3 and graphite linings thickness is conducive to the structure for taking into account gasket 3 Stability and sealing performance.Can simultaneously preferably, heat-resisting silk weaving elastic gauze pad is stainless pin knitmesh pad, and airtight and watertight padding layer is graphite Layer, elasticity is good for stainless pin knitmesh pad, and graphite linings changeability is strong, improves the sealing reliability and reusability of gasket 3.

In one embodiment, as shown in Fig. 2, the material of first flange 1 and second flange 2 is stainless steel SUH409L, thickness For 6-10mm, shape is band rounded diamond plate, and long side opposite the angle two sides are provided with bolt mounting holes 12,22, and centre offers centre Hole, interstitial hole are adaptively adjusted as exhaust pipe connecting welding hole, the size of interstitial hole according to air slit diameter.

As shown in figures 9 and 11, exhaust pipe assembly provided by the embodiment of the utility model, including downtake pipe 7, second The exhaust pipe connection structure that exhaust pipe 8 and aforementioned any embodiment are addressed；Downtake pipe 7 is sealedly attached in first flange 1, Second exhaust pipe 8 is sealedly attached in second flange 2.

Aforementioned exhaust pipe connection structure is selected to connect downtake pipe 7 and second exhaust pipe 8 to be spliced together, can be kept away Exempt from gas leakage at the gap between first flange 1 and second flange 2, lowers the requirement to flange surface flatness, and for sealing The gasket 3 of first flange 1 and second flange 2 is reusable.

In one embodiment, as Figure 7-8, downtake pipe 7 is inserted into the first method from the side away from annular protrusion 11 In the interstitial hole of orchid 1, and the end of downtake pipe 7 is no more than the root of annular protrusion 11；It is preferred that the end of downtake pipe 7 Clearance D 1 between the root of annular protrusion 11 is greater than 1mm；

As shown in figs. 9-10, second exhaust pipe 8 is inserted into the interstitial hole of second flange 2 from the side away from annular groove 21 It is interior, and the end of second exhaust pipe 8 is no more than the wall surface of annular groove 21；It is preferred that the end of second exhaust pipe 8 and annular are recessed Clearance D 2 between the wall surface of slot 21 is greater than 1mm；

As shown in figure 11, first flange 1 and second flange 2 are fastened by bolt 5 and the cooperation of nut 6.

First flange 1 and downtake pipe 7 form an exhaust pipe sub-unit (as Figure 7-8), second flange 2 and the Two exhaust pipes 8 form another exhaust pipe sub-unit, and two exhaust pipe sub-units realize phase by bolt 5 and the cooperation of nut 6 It is mutually fixed, and gasket 3 is sealed the gap between two exhaust pipe sub-units, prevents exhaust pipe assembly gas leakage；First Exhaust pipe 7 and second exhaust pipe 8 are inserted into the interstitial hole of first flange 1 respectively and the interstitial hole of second flange 2 is conducive to increase respectively The structural stability of exhaust pipe sub-unit, the end of downtake pipe 7 are no more than the root of annular protrusion 11, second exhaust pipe 8 End be no more than annular groove 21 wall surface, be on the one hand conducive to protect annular protrusion 11, guarantee first flange 1 structure On the other hand stability can increase the overall structure stability of exhaust pipe assembly again

Specifically, welded seal, second exhaust pipe 8 and second flange can be passed through between downtake pipe 7 and first flange 1 Welded seal can be passed through between 2.

The above is only the preferred embodiments of the present utility model only, is not intended to limit the utility model, all practical at this Made any modifications, equivalent replacements, and improvements etc., should be included in the guarantor of the utility model within novel spirit and principle Within the scope of shield.

Claims (10)

1. a kind of exhaust pipe connection structure, including first flange, second flange and gasket, which is characterized in that the gasket Including circular heat-resisting silk weaving elastic gauze pad and the airtight and watertight padding layer on the heat-resisting silk weaving elastic gauze pad, the sealing Packing layer a part is embedded in the mesh of the heat-resisting silk weaving elastic gauze pad, and remaining part is covered in the heat-resisting silk weaving elasticity The surface of gauze pad, the first flange are fixedly connected with the second flange, and the gasket is compressed in the first flange Between the second flange.

2. exhaust pipe connection structure according to claim 1, which is characterized in that the first flange towards described second The side of flange is equipped with annular protrusion；The second flange is equipped with annular groove, institute towards the side of the first flange It states annular protrusion to protrude into the annular groove, the gasket is in the annular groove, the inner wall of the gasket The outside wall surface of the corresponding annular protrusion, the outside wall surface of the gasket correspond to the wall surface of the annular groove.

3. exhaust pipe connection structure according to claim 2, which is characterized in that two sides of the gasket respectively with The wall surface of side and the annular groove of the first flange towards the second flange is interference fitted.

4. exhaust pipe connection structure according to claim 3, which is characterized in that the annular groove include the first annular groove and The second annular groove set on first annular groove bottom, first annular groove and second annular groove are combined into stepped groove；

One end of the gasket is located in first annular groove, and the other end is located in second annular groove, the annular protrusion It protrudes into second annular groove；The gasket is located at two sides of one end in first annular groove respectively with described first The wall surface of the side and first annular groove towards the second flange of flange is interference fitted；The gasket is located at institute The inner wall for stating one end in the second annular groove is bonded with the outside wall surface of the annular protrusion, the side of outside wall surface and second annular groove Wall surface fitting.

5. exhaust pipe connection structure according to claim 4, which is characterized in that the gasket includes air ring and is set to Columnar projections on the air ring, the air ring be compressed in the first flange side towards the second flange and Between the wall surface of first annular groove, the columnar projections protrude into second annular groove.

6. exhaust pipe connection structure according to claim 5, which is characterized in that first annular groove and second annular groove Between by round-corner transition, the section of the gasket is in band fillet " 7 word " shape.

7. exhaust pipe connection structure according to claim 1, which is characterized in that the heat-resisting silk weaving elastic gauze pad is metal Silk weaving gauze pad, the airtight and watertight padding layer are graphite linings.

8. exhaust pipe connection structure according to claim 1, which is characterized in that the gasket with a thickness of 2-4mm, position In the surface of the heat-resisting silk weaving elastic gauze pad the airtight and watertight padding layer with a thickness of 0.2-0.5mm.

9. a kind of exhaust pipe assembly, including downtake pipe and second exhaust pipe, which is characterized in that further include according to claim The described in any item exhaust pipe connection structures of 1-8；The downtake pipe is sealedly attached in the first flange, and described second Exhaust pipe is sealedly attached in the second flange.

10. a kind of exhaust pipe assembly, including downtake pipe and second exhaust pipe, which is characterized in that further include being wanted according to right Seek the described in any item exhaust pipe connection structures of 2-6；The downtake pipe is sealedly attached in the first flange, and described Two exhaust pipes are sealedly attached in the second flange；

The downtake pipe is inserted into the interstitial hole of the first flange from the side for deviating from the annular protrusion, and described the The end of one exhaust pipe is no more than the root of the annular protrusion；

The second exhaust pipe is inserted into the interstitial hole of the second flange from away from the side of the annular groove, and described the The end of two exhaust pipes is no more than the wall surface of the annular groove；

The first flange and the second flange are cooperated by screw bolt and nut to be fastened.