A straight-through guide type exhaust bellows with a looper flange

Abstract

The utility model belongs to the technical field of generator set exhaust system, especially is a straight through flow guide type exhaust bellows of loop flange, including bellows body and fixedly connected loop flan component and flanging sealing assembly at the both ends of bellows body, loop flan component includes flange ring and flanging nipple, one end of flanging nipple is fixedly connected with the port of bellows body through flanging sealing assembly, and the other end forms flanging ring, the flange ring is loose in flanging nipple outer, and can rotate freely around its axis, bellows body is upper and lower equal diameter straight through structure, this device can greatly simplify the installation process and eliminate assembly stress, prolong the service life of bellows, and, through the welding-free sealing and built-in flow guide structure, can significantly improve the sealing reliability and exhaust efficiency, and reduce the operation noise simultaneously.

Description

Technical Field

[0001] This utility model belongs to the technical field of generator set exhaust system, specifically relating to a loose flange equal diameter straight-through flow guide type exhaust bellows. Background Technology

[0002] Bellows are an important component of the generator set's exhaust system. Installed between the generator's exhaust pipe and the generator body, they are used to reduce generator noise and vibration, absorb thermal expansion, and compensate for exhaust deviations. However, traditional fixed bellows are cumbersome to install due to practical limitations. During installation, deviations in the spatial position of the connecting flange or the position of the threaded through hole are very likely to occur, causing pre-stress or torque to be generated in the bellows' own structure after installation. This non-design-state stress can seriously affect the service life of the bellows and easily create potential leakage hazards at the connection points. In addition, traditional bellows often use welding to connect flanges, and the weld itself is a potential weak point. Under long-term vibration and thermal cycling, there is a risk of cracking. At the same time, some bellows designs have problems with diameter changes or obstructed flow channels, which will increase exhaust back pressure and affect the exhaust efficiency and performance of the generator set. To address this issue, a loop flange equal-diameter straight-through flow-guiding exhaust bellows was designed. Utility Model Content

[0003] To address the problems mentioned in the background section, this invention provides a loop flange equal-diameter straight-through flow-guiding exhaust bellows, which greatly simplifies the installation process, eliminates assembly stress, extends the service life of the bellows, and significantly improves sealing reliability and exhaust efficiency through weld-free sealing and built-in flow-guiding structure, while reducing operating noise.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a loose flange equal diameter straight-through exhaust bellows, comprising a bellows body and a loose flange assembly and a flange sealing assembly fixedly connected to both ends of the bellows body. The loose flange assembly includes a flange ring and a flanged short section. One end of the flanged short section is fixedly connected to the port of the bellows body through the flange sealing assembly, and the other end forms a flange ring. The flange ring is loosely fitted outside the flanged short section and can rotate freely around its axis. The bellows body has an equal diameter straight-through structure.

[0005] As a preferred embodiment of the loose flange equal diameter straight-through flow-guiding bellows of this utility model, the flange sealing assembly is an integral flange ring directly formed at the port of the bellows body through a cold pressing process.

[0006] As a preferred embodiment of the loose flange equal diameter straight-through flow guide bellows of this utility model, the flanged short section and the integrated flanged ring are fixedly connected by a ring-shaped pressure ring and several fastening bolts.

[0007] As a preferred embodiment of the loose flange equal diameter straight-through flow-guiding exhaust bellows of this utility model, the inner end face of the flange ring, the rear inclined surface of the flange ring, and the flange short section are in contact with the outer surface of the pressure ring.

[0008] As a preferred embodiment of the loose flange equal diameter straight-through flow-guiding exhaust bellows of this utility model, an annular sealing groove is provided on the sealing surface of the flange ring, and a metal graphite spiral wound gasket is embedded in the annular sealing groove.

[0009] As a preferred embodiment of the loose flange equal diameter straight-through flow-guiding bellows of this utility model, a flow guide cylinder is coaxially arranged inside the bellows body, and the flow guide cylinder is fixedly connected to the inner wall of the bellows body through several support rods.

[0010] As a preferred embodiment of the loose flange equal diameter straight-through flow-guiding exhaust bellows of this utility model, the number of support rods is four, and they are evenly distributed along the circumference.

[0011] As a preferred embodiment of the loose flange equal diameter straight-through flow guide bellows of this utility model, the bellows body, the flanged short section and the flow guide cylinder are all made of stainless steel.

[0012] Compared with the prior art, the beneficial effects of this utility model are: 1. By using a loose flange that can rotate freely 360°, the bolt holes can be easily aligned during installation, effectively compensating for pipeline alignment deviations, avoiding torque and installation stress on the bellows due to inaccurate installation position, and extending service life. 2. The weld-free flanged sealing structure eliminates the potential leakage risks such as weld fatigue cracking and intergranular corrosion that may exist in welded flanges, greatly improving the sealing quality of the connection and the reliability of long-term operation. 3. The unit adopts a straight-through structure with equal diameter at the top and bottom, combined with an internal guide tube and support rod, forming a smooth exhaust channel, which effectively reduces exhaust back pressure, increases gas flow, and improves the exhaust efficiency of the generator set. Attached Figure Description

[0013] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2This is a schematic diagram of the structure of the flanged short section in this utility model; Figure 3 This is a schematic diagram of the flange ring in this utility model; Figure 4 This is a schematic diagram of the structure of the guide tube in this utility model; In the picture: 1. Corrugated pipe body; 2. Loose flange assembly; 21. Flange ring; 22. Flanged stub; 23. Flanged ring; 24. Sealing groove; 25. Metal-graphite spiral wound gasket; 3. Sealing assembly; 31. Integrated flange ring; 4. Pressure ring; 5. Tighten the bolts; 6. Flow guide tube; 7. Support rod. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0015] In addition, traditional bellows often use welding to connect flanges, and the weld itself is a potential weak point. Under long-term vibration and thermal cycling, there is a risk of cracking. At the same time, some bellows designs have problems with diameter changes or obstructed flow channels, which will increase exhaust back pressure and affect the exhaust efficiency and performance of generator sets. To solve these problems, a loose flange equal diameter straight-through flow guiding exhaust bellows is designed.

[0016] Furthermore: like Figures 1 to 4 As shown: Based on the above: A loose flange equal diameter straight-through exhaust bellows includes a bellows body 1 and a loose flange assembly 2 and a flange sealing assembly 3 fixedly connected to both ends of the bellows body 1. The loose flange assembly 2 includes a flange ring 21 and a flanged short section 22. One end of the flanged short section 22 is fixedly connected to the port of the bellows body 1 through the flange sealing assembly 3, and the other end forms a flange ring 23. The flange ring 21 is loosely fitted outside the flanged short section 22 and can rotate freely around its axis. The bellows body 1 has an equal diameter straight-through structure.

[0017] In this implementation scheme: the loose flange assembly 2 consists of a freely rotatable flange ring 21 and a flanged short section 22 with a flanged ring. The flanged sealing assembly 3 is used to connect the flanged short section 22 and the bellows body 1. The inlet and outlet inner diameters of the bellows body 1 are the same, and the internal flow channel is straight. The design of the loose flange makes it unnecessary to rotate the huge bellows body 1 or pipe during installation. Simply rotating the flange ring 21 is enough to align the bolt holes, which greatly reduces the installation difficulty and avoids the torsional stress caused to the bellows body 1 by forcibly tightening the bolts due to misalignment. This extends the service life of the bellows body 1. The equal diameter straight-through structure avoids the abrupt change in flow field and eddies caused by the variable diameter structure, effectively reduces the exhaust back pressure, makes the engine exhaust smoother, and helps to improve the performance of the generator set. This structure separates the connecting flange ring 21 from the bellows body 1, improving the versatility and replaceability of the components.

[0018] Furthermore: like Figures 1 to 4 As shown: In an optional embodiment, the flange sealing assembly 3 is an integral flange ring 31 directly formed at the port of the bellows body 1 by a cold pressing process.

[0019] In this embodiment, the integrated flange ring 31 adopts a weld-free one-piece molding structure, which fundamentally eliminates the risk of leakage caused by welding quality and significantly improves sealing reliability and safety.

[0020] Furthermore: like Figures 1 to 4 As shown: In an optional embodiment, the flanged short section 22 and the integral flanged ring 31 are fixedly connected by a ring-shaped pressure ring 4 and a plurality of fastening bolts 5.

[0021] In this embodiment, the components are mechanically clamped and fixed by a pressure ring 4 and fastening bolts 5, which allows for easy disassembly and replacement of parts during maintenance, resulting in excellent maintainability. The annular pressure ring 4 and the evenly distributed fastening bolts 5 can provide uniform clamping force, ensuring good sealing surface fit between the flanged short section 22 and the integrated flanged ring 31, and avoiding local stress concentration.

[0022] Furthermore: like Figures 1 to 4 As shown: In an optional embodiment, the inner end face of the flange ring 21 and the rear inclined surface of the integral flange ring 31, the flange short section 22 and the outer surface of the pressure ring 4 are fitted together.

[0023] In this embodiment, the fit between the flange ring 21 and multiple surfaces makes the entire connection structure more stable when subjected to internal medium pressure and external vibration, and less prone to loosening.

[0024] Furthermore: like Figures 1 to 4 As shown: In an optional embodiment, an annular sealing groove 24 is provided on the sealing surface of the flange ring 21, and a metal graphite spiral wound gasket 25 is embedded in the annular sealing groove 24.

[0025] In this implementation scheme: the flange ring 21 adopts a high-performance sealing combination of annular sealing groove 24 and metal graphite spiral wound gasket 25, which is very suitable for the high-temperature conditions of engine exhaust system, has good resilience and sealing performance, can effectively compensate for minor unevenness and thermal deformation, and ensure sealing reliability at high temperature.

[0026] Furthermore: like Figures 1 to 4 As shown: In an optional embodiment, a guide tube 6 is coaxially disposed inside the corrugated pipe body 1, and the guide tube 6 is fixedly connected to the inner wall of the corrugated pipe body 1 by a plurality of support rods 7.

[0027] In this embodiment, the guide tube 6 provides a smooth and continuous flow channel, which reduces the turbulence and eddies of the airflow at the corrugated tube folds, thereby not only reducing exhaust resistance but also effectively reducing airflow noise.

[0028] It should be noted that the support rod 7 has a streamlined design, which, together with the guide tube 6, forms a smooth exhaust channel.

[0029] Furthermore: like Figures 1 to 4 As shown: In an optional embodiment, the number of support rods 7 is four, and they are evenly distributed circumferentially.

[0030] In this embodiment, the evenly distributed support rods 7 around the circumference ensure that the guide tube 6 is stably fixed at the center of the bellows body 1, preventing vibration or wear caused by eccentricity.

[0031] Furthermore: like Figures 1 to 4 As shown: In an optional embodiment, the bellows body 1, the flanged short section 22, and the guide tube 6 are all made of stainless steel.

[0032] In this embodiment, the stainless steel material can withstand the continuous high temperature of engine exhaust and resist the corrosion of sulfides and other corrosive components in the exhaust gas, ensuring the long-term durability of the product under harsh working conditions.

[0033] Working principle: The loose flange assembly 2 consists of a freely rotatable flange ring 21 and a flanged short section 22 with a flanged ring. The flanged sealing assembly 3 is used to connect the flanged short section 22 and the bellows body 1. The inlet and outlet inner diameters of the bellows body 1 are the same, and the internal flow channel is straight. The design of the loose flange eliminates the need to rotate the large bellows body 1 or the pipe during installation. Simply rotating the flange ring 21 is sufficient to align the bolt holes, greatly reducing the installation difficulty and avoiding the torsional stress on the bellows body 1 caused by forcibly tightening the bolts due to misalignment. This extends the service life of the bellows body 1. The constant-diameter straight-through structure avoids abrupt flow field changes and eddies caused by variable-diameter structures, effectively reducing exhaust back pressure and making engine exhaust smoother, which helps improve generator set performance. This structure separates the connecting flange ring 21 from the bellows body 1, improving the versatility and replaceability of components. The integrated flange ring 31 adopts a weld-free one-piece molding structure, fundamentally eliminating the risk of leakage caused by welding quality, significantly improving sealing reliability and safety. It is mechanically clamped and fixed by a pressure ring 4 and fastening bolts 5, allowing for convenient disassembly during maintenance. With easy replacement of parts, it offers excellent maintainability. The annular pressure ring 4 and evenly distributed fastening bolts 5 provide uniform clamping force, ensuring good sealing surface contact between the flanged stub 22 and the integrated flanged ring 31, avoiding localized stress concentration. The fit between the flange ring 21 and multiple surfaces makes the entire connection structure more stable under internal medium pressure and external vibration, less prone to loosening. The flange ring 21 uses a high-performance sealing combination of annular sealing groove 24 and metal graphite spiral wound gasket 25, which is very suitable for the high-temperature conditions of engine exhaust systems, with good resilience and sealing performance. Effectively compensating for minor unevenness and thermal deformation, ensuring sealing reliability at high temperatures, the guide tube 6 provides a smooth, continuous flow channel, reducing turbulence and eddies in the bellows folds, which not only reduces exhaust resistance but also effectively reduces airflow noise. The circumferentially evenly distributed support rods 7 ensure that the guide tube 6 is stably fixed in the center of the bellows body 1, preventing vibration or wear caused by eccentricity. The stainless steel material can withstand the continuous high temperature of engine exhaust and resist the corrosion of sulfides and other corrosive components in the exhaust gas, ensuring the long-term durability of the product under harsh working conditions.

[0034] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A loose flange equal-diameter straight-through flow-guiding exhaust bellows, comprising a bellows body (1) and a loose flange assembly (2) and a flanged sealing assembly (3) fixedly connected to both ends of the bellows body (1), characterized in that: The loose flange assembly (2) includes a flange ring (21) and a flanged short section (22). One end of the flanged short section (22) is fixedly connected to the port of the bellows body (1) through the flanged sealing assembly (3), and the other end forms a flanged ring (23). The flange ring (21) is loosely fitted outside the flanged short section (22) and can rotate freely around its axis. The bellows body (1) has a straight-through structure with equal diameter at the top and bottom.

2. The loose flange equal diameter straight-through flow-guiding exhaust bellows according to claim 1, characterized in that: The flange sealing assembly (3) is an integral flange ring (31) directly formed at the port of the bellows body (1) by cold pressing process.

3. The loose flange equal diameter straight-through flow-guiding exhaust bellows according to claim 2, characterized in that: The flanged short section (22) and the integrated flanged ring (31) are fixedly connected by a ring-shaped pressure ring (4) and several fastening bolts (5).

4. The loose flange equal diameter straight-through flow-guiding exhaust bellows according to claim 3, characterized in that: The inner end face of the flange ring (21) and the rear inclined surface of the integral flange ring (31), the flange short section (22) and the outer surface of the pressure ring (4) are attached.

5. The loose flange equal diameter straight-through flow-guiding exhaust bellows according to claim 4, characterized in that: The flange ring (21) has an annular sealing groove (24) on its sealing surface, and a metal graphite spiral wound gasket (25) is embedded in the annular sealing groove (24).

6. The loose flange equal diameter straight-through flow-guiding exhaust bellows according to claim 5, characterized in that: The corrugated pipe body (1) is coaxially provided with a guide tube (6), and the guide tube (6) is fixedly connected to the inner wall of the corrugated pipe body (1) by a number of support rods (7).

7. The loose flange equal diameter straight-through flow-guiding exhaust bellows according to claim 6, characterized in that: The number of the support rods (7) is four, and they are evenly distributed along the circumference.

8. The loose flange equal diameter straight-through flow-guiding exhaust bellows according to claim 7, characterized in that: The corrugated pipe body (1), the flanged short section (22) and the guide tube (6) are all made of stainless steel.

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