Pipe flange expansion absorption seal

Abstract

The utility model relates to the technical field of test bed exhaust pipeline sealing, and specifically discloses a pipeline flange absorption expansion sealing structure, which comprises a first pipeline, a second pipeline, a packing flange in sealing connection with the end face of the first pipeline, and a graphite packing in sliding sealing connection with the outer wall of the second pipeline, wherein the side of the packing flange away from the first pipeline is provided with a connecting groove matched with the graphite packing, the graphite packing is sealingly embedded in the connecting groove, and the side of the packing flange away from the first pipeline is further detachably connected with a pressing flange for tightly pressing the graphite packing into the connecting groove. The utility model solves the problem of thermal expansion of the exhaust pipeline during the operation of the traditional test bed, which affects the assembly performance of the exhaust pipeline.

Description

Technical Field

[0001] This application relates to the field of test bench exhaust pipe sealing technology, and specifically discloses a pipe flange expansion absorption sealing structure. Background Technology

[0002] The function of the test bench exhaust pipe is to discharge the high-temperature exhaust gas generated during the test bench operation into the exhaust system, preventing the exhaust gas from accumulating and generating high temperatures, which could affect the function or damage of internal components, and ensuring the normal operation of the equipment. At the same time, the test bench exhaust pipe also reduces the heat generated during the test bench operation from being dissipated into the surrounding environment and reduces the impact of equipment operating noise on the surrounding environment.

[0003] Because the exhaust gas temperature from the test bench is high, the high temperature will cause the metal to expand thermally, which will affect the length of the pipeline. Traditional test bench exhaust pipelines are usually connected to each other by expansion joints and elbow joints. The installation of expansion joints is mostly done by connecting the expansion joint flange and the pipeline reserved flange with bolts and nuts. This method requires the operator to connect the flanges at both ends of the expansion joint separately. During the operation, there may be a situation where the bolt holes of the flange at the other end cannot be aligned after the flange at one end is installed, which will hinder the installation and maintenance. Furthermore, the compensation amount of the bellows expansion joint is usually limited by the number of corrugations and the wall thickness, and nonlinear deformation can easily lead to sudden changes in stiffness. The expansion joint has a limited displacement absorption capacity, and its application effect is poor in some exhaust pipelines with large axial deformation. In view of this, this utility model provides a pipeline flange expansion absorption sealing structure to solve the above problems. Utility Model Content

[0004] The purpose of this invention is to solve the problem of thermal expansion of exhaust pipes during the operation of traditional test benches, which affects the assembly performance of exhaust pipes.

[0005] To achieve the above objectives, the basic solution of this utility model provides a pipe flange expansion-absorbing sealing structure, including a first pipe and a second pipe for connection, a packing flange that is sealed to the end face of the first pipe, and a graphite packing that is slidably sealed to the outer wall of the second pipe. The packing flange has a connecting groove adapted to the graphite packing on the side away from the first pipe, and the graphite packing is sealed and fitted in the connecting groove. The side of the packing flange away from the first pipe can also be detachably connected to a pressure plate flange that presses the graphite packing into the connecting groove.

[0006] Furthermore, one end of the second pipe extends into the first pipe and is provided with a retaining ring with a diameter larger than the inner wall of the graphite packing.

[0007] Furthermore, the cross-section of the pressure plate flange is L-shaped, one end surface of the pressure plate flange is in contact with the surface of the packing flange, and the other end of the pressure plate flange is pressed against the graphite packing.

[0008] Furthermore, the graphite packing surface is provided with a mating groove that is adapted to the end of the pressure plate flange.

[0009] Furthermore, the packing flange includes a body, a connecting hole provided in the body, a limiting part provided inside the connecting hole, a connecting part provided at one end of the body, and a bolt hole provided at the other end of the body, wherein the limiting part and the other end of the body form the connecting groove.

[0010] Furthermore, the end of the connecting part is provided with a welding groove that mates with the end face of the first pipe.

[0011] Furthermore, a gap is formed between the limiting part and the outer wall of the second pipe, and a stepped surface is formed between the limiting part and the inner wall of the graphite packing.

[0012] The principle and effect of this solution are as follows: Compared with existing technologies, this utility model uses a packing flange for the first pipe connection, then uses a stone packing to achieve a sliding seal connection with the second pipe, and finally uses a pressure plate flange to fix the packing flange and the graphite packing together. This solves the problems of axial error during on-site installation of exhaust pipes and thermal expansion during test bench operation, while maintaining a sealed connection between the first and second pipes. It saves more operation time on-site, requires less installation space, has a longer service life, and the axial installation length is only 1.5-2 times the pipe diameter. It also requires no lateral space and is suitable for compact layout installations that only require axial alignment without pre-compression or pre-stretching, improving construction efficiency by more than 50%. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 A schematic diagram of a pipe flange expansion-absorbing sealing structure according to an embodiment of this application is shown; Figure 2 A schematic diagram of a packing flange in a pipe flange expansion absorption sealing structure proposed in an embodiment of this application is shown. Detailed Implementation

[0015] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0016] The reference numerals in the accompanying drawings include: first pipe 1, second pipe 2, packing flange 3, body 301, welding groove 302, limiting part 303, connecting groove 304, bolt hole 305, graphite packing 4, pressure plate flange 5, fixing bolt 6, and retaining ring 7.

[0017] A pipe flange expansion-absorbing sealing structure, implementing, for example Figure 1 As shown: It includes a first pipe 1 and a second pipe 2 that are connected. In the test bench, the first pipe 1 is the exhaust pipe of the test bench, and the second pipe 2 is the exhaust pipe. It also includes a packing flange 3 that is sealed to the end face of the first pipe 1 and a graphite packing 4 that is slidably sealed to the outer wall of the second pipe 2.

[0018] Among them, such as Figure 2 As shown, the packing flange 3 includes a main body 301, a connecting hole provided in the main body 301, a limiting part 303 provided inside the connecting hole, a connecting part provided at the left end of the main body 301, and a bolt hole 305 provided at the right end of the main body 301. The end of the connecting part is provided with a welding groove 302 that mates with the end face of the first pipe 1. The limiting part 303 can not only strengthen the structural strength of the main body 301, but also prevent airflow from directly overflowing between the packing flange 3 and the graphite packing 4, and reduce the airflow velocity at the contact part between the packing flange 3 and the graphite packing 4. A gap is formed between the limiting part 303 and the outer wall of the second pipe 2. A stepped surface is formed between the limiting part 303 and the inner wall of the graphite packing 4. A connecting groove 304 adapted to the graphite packing 4 is formed between the limiting part 303 and the right end of the main body 301.

[0019] The graphite packing 4 is sealed and fitted in the connecting groove 304. The right end face of the packing flange 3 is connected to the pressure plate flange 5, which presses the graphite packing 4 into the connecting groove 304, by fixing bolts 6. The pressure plate flange 5 has an L-shaped cross-section. One end surface of the pressure plate flange 5 is in contact with the surface of the packing flange 3, and the other end of the pressure plate flange 5 is pressed against the graphite packing 4. Correspondingly, the surface of the graphite packing 4 is provided with a mating groove that matches the end of the pressure plate flange 5.

[0020] One end of the second pipe 2 extends into the first pipe 1 and is provided with a retaining ring 7 with a diameter larger than the inner wall of the graphite packing 4 to prevent the second pipe 2 from detaching from the graphite packing 4.

[0021] Compared with the prior art, this embodiment uses a packing flange 3 to connect the first pipe 1, and then uses a stone packing to achieve a sliding seal connection with the second pipe 2. A pressure plate flange 5 is then used to fix the packing flange 3 and the graphite packing 4 together. This maintains the sealed connection between the first pipe 1 and the second pipe 2 while also solving the problems of axial error during on-site installation of the exhaust pipe and the absorption of thermal expansion during test run. This saves more on-site operation time, requires less installation space, has a longer service life, and the axial installation length is only 1.5-2 times the pipe diameter. It requires no lateral space and is suitable for compact layout installations where only axial alignment is needed, without pre-compression or pre-stretching, improving construction efficiency by more than 50%.

[0022] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any indirect modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A pipe flange expansion-absorbing sealing structure, characterized in that: The system includes a first pipe, a second pipe, a packing flange that is sealed to the end face of the first pipe, and a graphite packing that is slidably sealed to the outer wall of the second pipe. The packing flange has a connecting groove adapted to the graphite packing on the side away from the first pipe. The graphite packing is sealed and fitted into the connecting groove. The packing flange can also be detachably connected to a pressure plate flange that presses the graphite packing into the connecting groove on the side away from the first pipe.

2. The pipe flange expansion-absorbing sealing structure according to claim 1, characterized in that, One end of the second pipe extends into the first pipe and is equipped with a retaining ring with a diameter larger than the inner wall of the graphite packing.

3. The pipe flange expansion-absorbing sealing structure according to claim 1, characterized in that, The cross-section of the pressure plate flange is L-shaped. One end surface of the pressure plate flange is in contact with the surface of the packing flange, and the other end of the pressure plate flange is pressed against the graphite packing.

4. The pipe flange expansion-absorbing sealing structure according to claim 3, characterized in that, The graphite packing surface is provided with a mating groove that is adapted to the end of the pressure plate flange.

5. The pipe flange expansion-absorbing sealing structure according to claim 1, characterized in that, The packing flange includes a body, a connecting hole inside the body, a limiting part inside the connecting hole, a connecting part at one end of the body, and a bolt hole at the other end of the body, wherein the limiting part and the other end of the body form the connecting groove.

6. The pipe flange expansion-absorbing sealing structure according to claim 5, characterized in that, The end of the connecting part is provided with a welding groove that mates with the end face of the first pipe.

7. The pipe flange expansion-absorbing sealing structure according to claim 5, characterized in that, A gap is formed between the limiting part and the outer wall of the second pipe, and a stepped surface is formed between the limiting part and the inner wall of the graphite packing.

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