A connection sealing structure of a high-temperature pipeline

Abstract

The utility model relates to high temperature pipeline connection technical field, specifically disclose a kind of connection sealing structure of high temperature pipeline, including the first pipeline and second pipeline for high temperature ventilation connection, including the welding in the four around of first pipeline neck butt joint flange, with the flange plate of detachable connection of neck butt joint flange, the graphite packing for weakening extrusion stress and weakening second pipeline excursion amount being arranged between flange plate and the pipe outer wall of second pipeline and the pressing plate for fixing graphite packing position and with flange plate detachable connection. The device solves the problem that traditional ventilation pipeline cannot compensate ventilation pipeline expansion deformation amount by welding, and the heat expansion caused by high temperature leads to the problem of weld cracking.

Description

Technical Field

[0001] This application relates to the field of high-temperature pipeline technology, and specifically discloses a connection and sealing structure for high-temperature pipelines. Background Technology

[0002] Ventilation pipelines are structures used by petroleum, chemical, metallurgical, and light industrial enterprises to discharge gases. On test benches for complete machines or components such as aero engines and gas turbines, gas pipelines and intake / exhaust volutes are indispensable parts. This leads to the issues of sealing, connection, and deformation coordination between pipelines, volutes, and other components. This type of sealing falls under the category of static sealing. Common sealing methods in general use include: O-ring seals, gasket seals, mating surface seals, and sealant seals. The common characteristic of all these seals is that the connection at the sealing point is rigid. If the seal... When uneven deformation occurs on both sides, additional expansion joints or other deformation-absorbing structures are required, making the overall structure more complex. Connections of ventilation pipes of different diameters are also very common in these projects. However, some problems exist in ventilation pipe connection projects: traditional ventilation pipe connection methods all use welding between the pipe and flange, i.e., a rigid connection. This connection structure cannot compensate for the expansion deformation of the ventilation pipe. This expansion deformation is caused by thermal expansion due to high temperatures, which can easily lead to weld cracking, compromise the airtightness of the structure, and affect the structural safety and normal function of the ventilation pipe. These problems need improvement. Therefore, this utility model provides a connection and sealing structure for high-temperature pipelines to solve the above problems. Utility Model Content

[0003] The purpose of this invention is to solve the problem that traditional welded ventilation pipes cannot compensate for the expansion and deformation of the ventilation pipes, and that the weld cracks caused by thermal expansion due to high temperature.

[0004] To achieve the above objectives, this utility model provides the following basic solution:

[0005] A connection and sealing structure for a high-temperature pipeline includes a first pipeline and a second pipeline for high-temperature ventilation connection. The structure is characterized by comprising a weld neck flange welded around the first pipeline, a flange mounted on the second pipeline and detachably connected to the weld neck flange, a graphite packing disposed between the flange and the outer wall of the second pipeline to reduce compressive stress and reduce the amount of movement in the second pipeline, and a pressure plate for fixing the position of the graphite packing and detachably connected to the flange.

[0006] Furthermore, the flange is aligned with the welding neck flange and is fitted with several fully threaded studs. Each end of the fully threaded stud protrudes from both ends of the welding neck flange and the flange, and is threaded with a nut. This allows for a detachable connection between the flange and the welding neck flange.

[0007] Furthermore, a metal-clad gasket is provided at the connection between the flange and the weld neck flange. The non-metallic core of the metal-clad gasket provides initial sealing performance, fills minute gaps, and prevents media leakage.

[0008] Furthermore, the flange has a receiving groove on the side near the second pipe, and the graphite packing is inserted from the receiving groove to contact the outer wall of the second pipe. The flange is provided with a retaining groove, one end of the pressure plate is located outside the retaining groove, and the other end of the pressure plate is in contact with the graphite packing. The pressure plate is provided with a bolt, and the bolt passes through the pressure plate and is threadedly connected to the receiving groove.

[0009] Furthermore, the graphite packing has a disc-shaped structure, and the external dimensions of the graphite packing are equal to the internal dimensions of the receiving groove.

[0010] Furthermore, the graphite packing has an installation groove on its inner side near the second pipe, and a connecting rod is installed in the installation groove, with a connecting block rotatably connected to the connecting rod.

[0011] Furthermore, the connecting block is made of the same material as the graphite packing.

[0012] Furthermore, the surface of the connecting block is in contact with the wall of the second pipe.

[0013] The principle and effect of this solution are as follows:

[0014] 1. Compared with existing technologies, this solution uses a weld neck flange, which is connected to a flange plate, thus enabling a detachable connection between the first and second pipelines. The gap between the flange plate and the second pipeline allows for the installation of the graphite packing. A pressure plate is then installed to secure the graphite packing, ensuring contact between the packing and the second pipeline. The graphite packing fills the tiny gaps at the pipe joint, forming a tightly fitting sealing layer that effectively prevents leakage of liquid or gaseous media. Its braided structure further compresses under pressure, enhancing the sealing effect.

[0015] 2. Compared with the prior art, the graphite packing in this application is essentially used to offset the thermal expansion of the second pipe. Because of the braided structure of the graphite packing, the compressive stress between materials can be weakened. That is, the compressive stress of the expansion of the second pipe acts on the graphite packing, thereby reducing the compressive stress on the first pipe. This solves the problem of weld cracking caused by expansion stress at the connection between the first and second pipes in the traditional way. Moreover, due to the setting of the graphite packing, it still has sealing characteristics compared with the traditional welding fixation.

[0016] 3. Compared with the prior art, this application further improves the structure of the graphite packing by setting an anti-channeling structure. This anti-channeling structure is mainly used to absorb the amount of axial channeling of the second pipe. The combined use of the anti-channeling structure and the graphite packing enables the first and second pipes to absorb large axial channeling and a certain amount of radial channeling based on the dynamic connection, eliminating the need for expansion joints and other components, simplifying the overall structure of the device and reducing costs. Attached Figure Description

[0017] 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.

[0018] Figure 1 This diagram shows the position of a connection sealing structure for a high-temperature pipeline according to an embodiment of this application.

[0019] Figure 2 This paper shows a schematic diagram of a connection and sealing structure for a high-temperature pipeline according to an embodiment of this application.

[0020] Figure 3 This application illustrates a connection sealing structure for a high-temperature pipeline according to an embodiment of the present application. Figure 2 An enlarged schematic diagram of part A;

[0021] Figure 4 This paper shows a schematic diagram of the graphite packing in a connection sealing structure for a high-temperature pipeline according to an embodiment of this application. Detailed Implementation

[0022] 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.

[0023] The reference numerals in the accompanying drawings include: first pipe 1, second pipe 2, weld neck flange 3, metal-clad gasket 4, fully threaded stud 5, flange 6, nut 7, receiving groove 8, bolt 9, pressure plate 10, graphite packing 11, connecting rod 1102, and connecting block 1103.

[0024] Implementation, for example Figures 1-4 As shown:

[0025] A connection and sealing structure for a high-temperature pipeline includes a first pipeline 1 and a second pipeline 2 for high-temperature ventilation connection, such as... Figure 1As shown, when the airflow enters, it causes thermal expansion at the connection between pipe 1 and pipe 2. Traditional welding methods will lead to weld cracking. Therefore, this device improves the relevant methods to address this weld cracking problem. Specifically:

[0026] It includes a necked welding flange 3 welded around the first pipe 1, a flange 6 detachably connected to the necked welding flange 3 and installed on the second pipe 2, a graphite packing 11 disposed between the flange 6 and the outer wall of the second pipe 2 to reduce the compressive stress and reduce the amount of movement of the second pipe 2, and a pressure plate 10 for fixing the position of the graphite packing 11 and detachably connected to the flange 6.

[0027] About Graphite Packing 11: Graphite Packing 11 forms a tight-fitting sealing layer by filling the tiny gaps at pipe joints, effectively preventing leakage of liquid or gas media. Its braided structure further compresses under pressure, enhancing the sealing effect, and is suitable for both static and dynamic sealing.

[0028] A weld neck flange 3 is welded around the end of the first pipe 1. A flange 6 is aligned with the weld neck flange 3 and is fitted with several fully threaded studs 5. The two ends of the fully threaded studs 5 pass through the weld neck flange 3 and the flange 6 respectively and are threadedly connected to nuts 7. This allows for a detachable connection between the flange 6 and the weld neck flange 3.

[0029] After the flange 6 is connected to the welding neck flange 3, a metal-clad gasket 4 is installed at the connection between the flange 6 and the welding neck flange 3. The non-metallic inner core of the metal-clad gasket 4 provides initial sealing performance, fills the small gaps, and prevents media leakage.

[0030] The flange 6 has a receiving groove 8 on its inner side near the second pipe 2. The graphite packing 11 is inserted from the receiving groove 8 and contacts the outer wall of the second pipe 2. The flange 6 is provided with a retaining groove. One end of the pressure plate 10 is located outside the retaining groove, and the other end of the pressure plate 10 contacts the graphite packing 11. The pressure plate 10 is provided with a bolt 9, which passes through the pressure plate 10 and is threadedly connected to the receiving groove 8.

[0031] Specifically: The graphite packing 11 has a disc-shaped structure, and its external dimensions are equal to the internal dimensions of the receiving groove 8. An installation groove is formed on the inner side of the graphite packing 11 near the second pipe 2. A connecting rod 1102 is installed in the installation groove, and a connecting block 1103 is rotatably connected to the connecting rod 1102. The connecting block 1103 and the graphite packing 11 are made of the same material. The surface of the connecting block 1103 is in contact with the wall of the second pipe 2. When the second pipe 2 thermally expands, it further compresses the connecting block 1103 and the graphite packing 11.

[0032] Specific principles:

[0033] The first pipe 1 and the second pipe 2 are detachably connected by the necked welding flange 3 and the flange 6 to avoid the problem of weld cracking. Since a dynamic connection is used, there is naturally a sealing problem. In order to solve this sealing problem, a graphite packing 11 is set up. The braided structure of the graphite packing 11 is used to weaken the compressive stress between the first pipe 1 and the second pipe 2, while ensuring the sealing environment between the pipes.

[0034] Since the first pipe 1 is connected to the second pipe 2, the first pipe 1 and the second pipe 2 themselves may have axial and radial movement based on the gas passing through them. Therefore, when the graphite packing 11 is brought into contact with the pipe wall of the second pipe 2 by the connecting block 1103, the amount of radial movement is absorbed by the graphite packing 11, and the amount of axial movement is absorbed by the connecting block 1103.

[0035] This device solves the problem that traditional welded ventilation pipes cannot compensate for the expansion and deformation of the ventilation pipes, and that the weld cracks caused by thermal expansion due to high temperature.

[0036] 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 simple 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 connection and sealing structure for a high-temperature pipeline, comprising a first pipeline and a second pipeline for high-temperature ventilation connection, characterized in that, It includes a weld neck flange welded around the first pipe, a flange mounted on the second pipe that is detachably connected to the weld neck flange, a graphite packing located between the flange and the outer wall of the second pipe to reduce compressive stress and reduce the amount of movement of the second pipe, and a pressure plate that is detachably connected to the flange to fix the position of the graphite packing.

2. The connection and sealing structure for a high-temperature pipeline according to claim 1, characterized in that, The flange is aligned with the necked welding flange and is equipped with several fully threaded studs. The two ends of the fully threaded studs pass through the necked welding flange and the flange respectively and are threaded with nuts.

3. The connection and sealing structure for a high-temperature pipeline according to claim 2, characterized in that, A metal-clad gasket is provided at the connection between the flange and the necked welding flange.

4. A connection and sealing structure for a high-temperature pipeline according to claim 2 or 3, characterized in that, The flange has a receiving groove on the side near the second pipe. The graphite packing is inserted into the receiving groove and contacts the outer wall of the second pipe. The flange has a retaining groove. One end of the pressure plate is located outside the retaining groove, and the other end of the pressure plate contacts the graphite packing. The pressure plate has a bolt, which passes through the pressure plate and is threaded into the receiving groove.

5. The connection and sealing structure for a high-temperature pipeline according to claim 4, characterized in that, The graphite packing has a disc-shaped structure, and the external dimensions of the graphite packing are equal to the internal dimensions of the receiving groove.

6. The connection and sealing structure for a high-temperature pipeline according to claim 5, characterized in that, The graphite packing has an installation groove on its inner side near the second pipe. A connecting rod is installed in the installation groove, and a connecting block is rotatably connected to the connecting rod.

7. The connection and sealing structure for a high-temperature pipeline according to claim 6, characterized in that, The connecting block is made of the same material as the graphite packing.

8. The connection and sealing structure for a high-temperature pipeline according to claim 7, characterized in that, The surface of the connecting block is in contact with the wall of the second pipe.

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