Combined high-temperature waste gas sealing structure

Abstract

The utility model discloses a combined high-temperature waste gas sealing structure, which belongs to the technical field of diesel engine exhaust systems and comprises a corrugated pipe, a first exhaust manifold and a second exhaust manifold. One end of the corrugated pipe is sleeved on the outer side of the first exhaust manifold, the other end of the corrugated pipe is connected with a corrugated pipe flange, and an exhaust manifold flange is arranged on the outer side of the second exhaust manifold; a groove is formed in the exhaust manifold flange, a V-shaped sealing ring is clamped in the groove, and the V-shaped sealing ring abuts against the corrugated pipe flange and the bottom face of the groove. And the corrugated pipe flange and the exhaust manifold flange are clamped and connected through a hoop. The V-shaped sealing ring is installed in the groove, reliable sealing of the exhaust manifold flange and the corrugated pipe flange is achieved, the exhaust manifold flange and the corrugated pipe flange are clamped through the hoop, and reliability and stability of connection are guaranteed. The corrugated pipe has certain deformation, certain deformation is compensated when the corrugated pipe is subjected to cold and hot impact, the problems of air leakage and cracking are effectively avoided, and the service life of the exhaust manifold is effectively prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of diesel engine exhaust systems, in particular to a combined high-temperature exhaust gas sealing structure. Background Art

[0002] In the field of medium and heavy-duty diesel engines, the exhaust temperature of the engine can reach about 700°C, and even higher can reach 800°C. The engine exhaust is discharged through the exhaust manifold. The exhaust temperature in the exhaust manifold will also vary greatly under different working conditions. Therefore, the exhaust manifold will often be in a state of cold and hot shock. The exhaust manifold is prone to cracks or poor sealing, which will cause leakage in the exhaust system, affect engine efficiency, and cause engine thermal hazards. In more serious cases, it will cause the engine to catch fire and affect personal safety. Therefore, it is particularly important to adopt a suitable exhaust gas sealing method.

[0003] At present, the engine exhaust manifold mainly adopts a segmented plug-in structure. As for the sealing form of the segmented plug-in structure, most of them now adopt sealing ring sealing and light tube thermal expansion structure.

[0004] The sealing ring sealing structure has the characteristics of simple structure and high stability, which can effectively reduce the risk of thermal cracking of the exhaust manifold. It has many application scenarios. However, the disadvantage of the sealing ring sealing structure technology is that it is very easy to cause leakage in the early stage of engine operation, and the leakage will become more and more obvious over time. The bare tube thermal expansion structure has extremely strict requirements on the matching clearance of the exhaust manifold. In actual applications, the matching clearance of the exhaust manifold is not easy to grasp, and too small a matching clearance can easily cause the exhaust manifold to crack. Utility Model Content

[0005] In order to solve the problem that the shortcomings of the sealing ring sealing structure technology are that it is very easy to cause air leakage in the early stage of engine operation, and the air leakage will become more and more obvious as time goes by; the light tube thermal expansion structure has extremely strict requirements on the fitting clearance of the exhaust manifold, and too small fitting clearance is easy to cause the exhaust manifold to crack, the utility model provides a combined high-temperature exhaust gas sealing structure.

[0006] The utility model is realized by the following technical solutions:

[0007] A combined high-temperature exhaust gas sealing structure comprises a bellows, a first exhaust manifold and a second exhaust manifold arranged in sequence along the exhaust direction; one end of the bellows is sleeved on the outside of the first exhaust manifold, the other end of the bellows is connected to a bellows flange, and an exhaust manifold flange corresponding to the bellows flange is arranged on the outside of the second exhaust manifold; a groove is provided on the side of the exhaust manifold flange close to the first exhaust manifold, a V-shaped sealing ring is clamped in the groove, and two edges of the V-shaped sealing ring are respectively abutted against the bellows flange and the bottom surface of the groove; the bellows flange and the exhaust manifold flange are clamped and connected by a clamp.

[0008] A further improvement of the utility model is that a guide pipe is provided at one end of the first exhaust manifold close to the second exhaust manifold, and an annular inner hole capable of slidingly inserting with the guide pipe is provided at one end of the second exhaust manifold close to the first exhaust manifold.

[0009] A further improvement of the utility model is that an expansion gap is provided between the guide tube and the annular inner hole.

[0010] A further improvement of the utility model is that an expansion gap is provided between the end surface of the guide tube and the end surface of the annular inner hole.

[0011] A further improvement of the utility model is that the outer edge of the end of the guide tube is chamfered.

[0012] A further improvement of the utility model is that an edge of one end of the annular inner hole close to the first exhaust manifold is chamfered.

[0013] A further improvement of the utility model is that an end of the annular inner hole away from the first exhaust manifold smoothly transitions to the inner wall of the second exhaust manifold.

[0014] A further improvement of the utility model is that an inner liner tube is welded to the inner side of one end of the bellows close to the first exhaust manifold; the inner liner tube is welded and sealed to the outer side of the first exhaust manifold.

[0015] A further improvement of the utility model is that an outer liner is welded to the outer side of one end of the bellows close to the first exhaust manifold.

[0016] A further improvement of the utility model is that the corrugated pipe adopts a double-layer structure.

[0017] It can be seen from the above technical solutions that the beneficial effects of the utility model are:

[0018] The V-shaped sealing ring is installed in the groove to achieve reliable sealing of the exhaust manifold flange and the bellows flange, and the exhaust manifold flange and the bellows flange are clamped by the clamp to ensure the reliability and stability of the connection. The bellows has a certain amount of deformation, which can be compensated when subjected to cold and hot shocks, effectively avoiding leakage and cracking problems, and effectively extending the life of the exhaust manifold. The overall structure is simple, easy to implement, and practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solution of the utility model, the drawings required for use in the description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1It is a structural schematic diagram of a specific implementation method of the utility model.

[0021] Figure 2 It is a schematic diagram of the installation of the bellows and the first exhaust manifold according to a specific implementation manner of the utility model.

[0022] Figure 3 It is a schematic diagram of the structure of the second exhaust manifold according to a specific implementation manner of the utility model.

[0023] Figure 4 It is a partial enlarged structural schematic diagram of a specific implementation method of the utility model.

[0024] In the accompanying drawings: 1. first exhaust manifold, 11. guide pipe, 2. second exhaust manifold, 21. exhaust manifold flange, 22. annular inner hole, 23. groove, 3. inner liner pipe, 4. bellows, 41. bellows flange, 5. outer liner pipe, 6. V-shaped sealing ring, 7. clamp. DETAILED DESCRIPTION

[0025] In order to make the purpose, features and advantages of the utility model more obvious and easy to understand, the technical scheme of the utility model will be clearly and completely described below in combination with the drawings in the specific embodiment. Obviously, the embodiments described below are only part of the embodiments of the utility model, not all of them. Based on the embodiments in this patent, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this patent.

[0026] like Figure 1-4 As shown, the utility model discloses a combined high-temperature exhaust gas sealing structure, comprising a bellows 4, a first exhaust manifold 1 and a second exhaust manifold 2 arranged in sequence along the exhaust direction, that is, the first exhaust manifold 1 is arranged close to the engine, and the second exhaust manifold 2 is arranged far away from the engine, and the first exhaust manifold 1 is set in front and the second exhaust manifold 2 is set in the back; the front end sealing sleeve of the bellows 4 is mounted on the outer side of the rear part of the first exhaust manifold 1, the rear end of the bellows 4 is connected with a bellows flange 41, and the outer side of the front part of the second exhaust manifold 2 is provided with an exhaust manifold flange 21 corresponding to the bellows flange 41; a groove 23 is provided on the front side of the exhaust manifold flange 21, and a V-shaped sealing ring 6 is clamped in the groove 23, and the two edges of the V-shaped sealing ring 6 are respectively abutted against the bellows flange 41 and the bottom surface of the groove 23, and the V-shaped sealing ring 6 is installed with interference fit; the bellows flange 41 and the exhaust manifold flange 21 are clamped and connected by a V-shaped clamp 7.

[0027] The V-shaped sealing ring 6 is installed in the groove 23 (with the opening facing inward), so as to realize reliable sealing of the exhaust manifold flange 21 and the bellows flange 41, and the exhaust manifold flange 21 and the bellows flange 41 are clamped by the clamp 7 to ensure the reliability and stability of the connection. The bellows 4 has a certain amount of deformation, which can be compensated when subjected to cold and hot shocks, effectively avoiding leakage and cracking problems, and effectively extending the life of the exhaust manifold. The overall structure is simple, easy to implement, and has good practicality.

[0028] Among them, Figure 2-3 As shown, a guide tube 11 is provided at one end (rear end) of the first exhaust manifold 1 close to the second exhaust manifold 2, and an annular inner hole 22 capable of sliding and plugging with the guide tube 11 is provided on the inner side of one end (front end) of the second exhaust manifold 2 close to the first exhaust manifold 1. The diameter of the annular inner hole 22 is larger than the diameter of the second exhaust manifold 2 itself; by inserting the guide tube 11 into the annular inner hole 22, it can not only play a better guiding role, but also ensure the smooth passage of the exhaust gas, avoid the exhaust gas from directly impacting the sealing structure (bellows 4), and ensure the service life of the sealing structure.

[0029] There is an expansion gap between the guide tube 11 and the annular inner hole 22. There is an expansion gap between the end surface of the guide tube 11 and the end surface of the annular inner hole 22. The risk of exhaust manifold tearing can be effectively reduced, and the reliability of use can be ensured.

[0030] The outer edge of the rear end of the guide tube 11 is chamfered, and the front edge of the annular inner hole 22 is chamfered, which effectively improves the convenience of assembly and realizes plug-in guidance.

[0031] Among them, Figure 3 As shown, the end (rear end) of the annular inner hole 22 away from the first exhaust manifold 1 smoothly transitions to the inner wall of the second exhaust manifold 2. Since the diameter of the annular inner hole 22 is larger than the diameter of the inner hole of the second exhaust manifold 2, the connection position between the two smoothly transitions, ensuring that the exhaust gas is discharged more smoothly and avoiding impact turbulence.

[0032] like Figure 4 As shown, an inner liner tube 3 is welded to the inner side of one end (front end) of the bellows 4 close to the first exhaust manifold 1; the inner liner tube 3 is welded and sealed to the outer side of the first exhaust manifold 1. The front end of the bellows 4 is welded and sealed to the outer side of the first exhaust manifold 1 through the inner liner tube 3 to ensure the reliability of the connection.

[0033] Furthermore, an outer liner 5 is welded to the outer side of one end (front end) of the bellows 4 close to the first exhaust manifold 1. The outer liner 5 strengthens the fixation of the front end of the bellows 4 to ensure the reliability of the welding seal with the first exhaust manifold 1.

[0034] The bellows 4 adopts a double-layer structure to ensure the service life of the bellows 4 itself.

[0035] The combined high-temperature exhaust gas sealing structure is installed in the groove 23 through the V-shaped sealing ring 6 to achieve reliable sealing of the exhaust manifold flange 21 and the bellows flange 41, and the exhaust manifold flange 21 and the bellows flange 41 are clamped by the clamp 7 to ensure the reliability and stability of the connection. The bellows 4 has a certain amount of deformation, which can compensate for a certain amount of deformation when subjected to cold and hot shocks, effectively avoiding leakage and cracking problems, and effectively extending the life of the exhaust manifold. The overall structure is simple, easy to implement, and has good practicality.

[0036] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the various embodiments can be referenced to each other.

[0037] The terms "upper", "lower", "outer side", "inner side", etc. in the specification and claims of the utility model and the above-mentioned drawings are used to distinguish the relative relationship in position if they exist, and do not need to be qualitative. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the utility model described here can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0038] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A combined high-temperature exhaust gas sealing structure, It is characterized in that The invention comprises a bellows (4), a first exhaust manifold (1) and a second exhaust manifold (2) which are arranged in sequence along the exhaust direction; one end of the bellows (4) is sleeved on the outside of the first exhaust manifold (1), the other end of the bellows (4) is connected to a bellows flange (41), and the outside of the second exhaust manifold (2) is provided with an exhaust manifold flange (21) corresponding to the bellows flange (41); a groove (23) is provided on the side of the exhaust manifold flange (21) close to the first exhaust manifold (1), a V-shaped sealing ring (6) is clamped in the groove (23), and two edges of the V-shaped sealing ring (6) are respectively in contact with the bellows flange (41) and the bottom surface of the groove (23); the bellows flange (41) and the exhaust manifold flange (21) are clamped and connected by a clamp (7).

2. The combined high-temperature exhaust gas sealing structure according to claim 1, It is characterized in that A guide pipe (11) is provided at one end of the first exhaust manifold (1) close to the second exhaust manifold (2), and an annular inner hole (22) capable of slidingly inserting and matching with the guide pipe (11) is provided at one end of the second exhaust manifold (2) close to the first exhaust manifold (1).

3. The combined high-temperature exhaust gas sealing structure according to claim 2, It is characterized in that An expansion gap is provided between the guide tube (11) and the annular inner hole (22).

4. The combined high-temperature exhaust gas sealing structure according to claim 2, It is characterized in that An expansion gap is provided between the end surface of the guide tube (11) and the end surface of the annular inner hole (22).

5. The combined high-temperature exhaust gas sealing structure according to claim 2, It is characterized in that The outer edge of the end of the guide tube (11) is chamfered.

6. The combined high-temperature exhaust gas sealing structure according to claim 2, It is characterized in that An edge of one end of the annular inner hole (22) close to the first exhaust manifold (1) is chamfered.

7. The combined high-temperature exhaust gas sealing structure according to claim 2, It is characterized in that An end of the annular inner hole (22) away from the first exhaust manifold (1) smoothly transitions to the inner wall of the second exhaust manifold (2).

8. The combined high-temperature exhaust gas sealing structure according to claim 1, It is characterized in that An inner lining tube (3) is welded to the inner side of one end of the bellows (4) close to the first exhaust manifold (1); the inner lining tube (3) is welded and sealed to the outer side of the first exhaust manifold (1).

9. The combined high-temperature exhaust gas sealing structure according to claim 1, It is characterized in that An outer liner tube (5) is welded to the outer side of one end of the bellows (4) close to the first exhaust manifold (1).

10. The combined high-temperature exhaust gas sealing structure according to claim 1, It is characterized in that The bellows (4) adopts a double-layer structure.

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