Sealing device for furnace nose of hot galvanizing unit

Abstract

The invention relates to the field of metallurgical equipment, and provides a sealing device for a furnace nose of a hot galvanizing unit, which comprises an upper flange, a lower flange, a high-temperature sealing packing, a fastener and a sealing ring, the upper flange and the lower flange are fixed through the fastener; a sealing groove is formed in the contact surface of the lower flange, and the high-temperature sealing packing is placed in the sealing groove; threads are arranged on the contact face of the upper flange and the lower flange, and the upper flange and the lower flange are in threaded connection. According to the invention, a linear sealing structure mode is adopted. The sealing structure is convenient to install, sealing dislocation in the installation process is prevented, meanwhile, thermal deformation of the flange is compensated through the linear sealing mode, the air tightness of the furnace nose tip area is guaranteed, oxygen molecules in the atmosphere outside the furnace are prevented from entering the furnace nose tip, strip steel oxidation is avoided, the surface quality defect of the strip steel is eliminated, and the product quality and the product image are improved. Good popularization and application prospects are realized.

Description

Technical Field

[0001] The present invention relates to the field of metallurgical equipment, and more specifically to a sealing device for the furnace nose of a hot-dip galvanizing unit. Background Art

[0002] In the existing galvanizing unit, the strip exits the annealing furnace and enters the zinc pot through the furnace nose. The tip of the furnace nose is immersed in the zinc pot. To prevent the strip from being oxidized, the tip of the furnace nose must ensure strict airtightness to prevent oxygen molecules in the outside atmosphere from entering the tip of the furnace nose and avoid quality defects. Currently, the sealing of the furnace nose tip adopts the method of plane sealing with a metal-graphite gasket. This sealing method can provide good sealing effect in the initial stage, ensuring effective isolation of the furnace internal environment from the outside atmosphere, thereby preventing the occurrence of oxidation reaction and guaranteeing the quality of the strip during the galvanizing process. However, as the production process continues, especially in a long-term high-temperature environment, the material properties of the metal-graphite gasket gradually show their limitations. Under the continuous action of high temperature, the seal is prone to aging and cracking. At the same time, the two flanges are also prone to thermal deformation in the high-temperature environment, resulting in loose sealing. The gasket material is prone to aging, and its internal chemical structure changes, making the material itself become brittle and prone to cracks. Once these cracks are formed, they will destroy the integrity of the gasket and make it unable to effectively prevent the leakage of gas or liquid.

[0003] Over time, the sealing performance of the metal-graphite gasket gradually decreases, eventually leading to the problem of loose sealing, resulting in the airtightness of the furnace nose tip area not meeting the requirements, and oxygen molecules in the outside atmosphere are extremely likely to enter the tip of the furnace nose. This not only affects the production efficiency of the hot-dip galvanizing unit, but also may cause quality problems such as oxidation on the surface of the strip, oxidize the strip, resulting in quality defects such as white stripes, white spots and dezincification after the strip exits the zinc pot, and has an adverse impact on the appearance and performance of the final product. Summary of the Invention

[0004] Based on the above purpose, the present invention proposes a sealing device for the furnace nose of a hot-dip galvanizing unit, including: an upper flange, a lower flange, a high-temperature sealing packing, fasteners and a sealing ring; The upper flange and the lower flange are fixed by the fasteners; A sealing groove is opened on the contact surface of the lower flange, and the high-temperature sealing packing is placed in the sealing groove; Threads are provided on the contact surface of the upper flange and the lower flange, and are threadedly connected with the sealing ring.

[0005] In some embodiments, the high-temperature sealing packing is a graphite fiber braided packing.

[0006] In some embodiments, the materials of the upper flange and the lower flange are 316L stainless steel.

[0007] In some embodiments, the fastener includes a bolt, a nut, and a gasket, wherein the gasket is a graphite gasket.

[0008] In some embodiments, the high-temperature sealing packing is coated with a high-temperature sealant and fixed in the sealing groove.

[0009] In some embodiments, the joints at both ends of the high-temperature sealing packing are inclined plane parallel to each other.

[0010] In some embodiments, the central through-holes of the upper flange and the lower flange serve as nitrogen inlet holes for circulating nitrogen.

[0011] In some embodiments, the sealing ring is made of elastic polyurethane material.

[0012] In some embodiments, the sealing ring has a pre-tightening force for self-adaptive shape adjustment.

[0013] In some embodiments, the sealing ring is detachable.

[0014] The present invention has at least the following beneficial technical effects: The present invention provides a sealing device for the nose of a hot-dip galvanizing unit, comprising: an upper flange, a lower flange, a high-temperature sealing packing, a fastener, and a sealing ring; the upper flange and the lower flange are fixed by the fastener; a sealing groove is formed on the contact surface of the lower flange, and the high-temperature sealing packing is placed in the sealing groove; threads are provided on the contact surface between the upper flange and the lower flange for threaded connection with the sealing ring.

[0015] The present invention adopts a line-sealing structural method. This sealing structure is convenient for installation, prevents sealing misalignment during installation, and at the same time, this line-sealing method also compensates for the thermal deformation of the flange, ensures the airtightness of the nose tip area of the furnace, prevents oxygen molecules in the external atmosphere from entering the nose tip of the furnace, avoids strip oxidation, eliminates strip surface quality defects, and improves product quality and product image. It has good prospects for popularization and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings are used to provide a further understanding of the present invention and constitute a part of the specification, and are used together with the following specific embodiments to explain the present invention, but do not constitute a limitation to the present invention. In the drawings: Figure 1 The structural diagram of a sealing device for the nose of a hot-dip galvanizing unit according to an embodiment of the present invention is shown; Wherein, 1. Upper flange; 2. Lower flange; 3. Sealing groove; 4. High-temperature sealing packing; 5. Fastener; 6. Sealing ring. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] The specific embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only for the purpose of illustrating and explaining the present disclosure, and are not intended to limit the present disclosure.

[0018] In addition, the mention of "embodiments" in this document means that the specific features, structures, or characteristics described in connection with the embodiments are included in at least one embodiment of the present invention. The phrase may not necessarily refer to the same embodiment at various positions in the specification, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein are combined with other embodiments.

[0019] Those skilled in the art of this technology understand that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as the general understanding of those of ordinary skill in the art to which this application belongs. It should also be understood that terms such as those defined in a general dictionary should be understood to have a meaning consistent with their meaning in the context of the prior art, and will not be interpreted in an idealized or overly formal sense unless specifically defined as in the embodiments of this application.

[0020] The present invention provides a sealing device for the furnace nose of a hot-dip galvanizing line, comprising: an upper flange 1, a lower flange 2, a high-temperature sealing packing 4, fasteners 5, and a sealing ring 6; The upper flange 1 and the lower flange 2 are fixed by the fasteners 5; A sealing groove 3 is formed on the contact surface of the lower flange 2, and the high-temperature sealing packing 4 is placed in the sealing groove 3; Threads are provided on the contact surface between the upper flange 1 and the lower flange 2 for threaded connection with the sealing ring 6.

[0021] The original plane sealing method is changed to a line sealing method. In this sealing structure, a sealing groove 3 is milled on the surface of the lower flange 2 of the sealing surface. The surface of the sealing groove 3 is smooth and free of burrs. The high-temperature resistant sealing packing 4 is placed in the sealing groove 3. Threads are milled on the upper flange 1 and the sealing ring 6 is installed. This sealing structure is easy to install, prevents sealing misalignment during installation. At the same time, this line sealing method also compensates for the thermal deformation of the flange, ensuring the airtightness of the furnace nose tip area.

[0022] The line seal method forms a more reliable sealing surface through the close contact between the high-temperature sealing packing 4 and the sealing groove 3. Compared with the plane seal, its sealing performance is more excellent. The surface of the sealing groove 3 is smooth and free of burrs, ensuring that the high-temperature sealing packing 4 will not be damaged during installation, further improving the sealing effect. The design of the sealing groove 3 makes the installation of the high-temperature sealing packing 4 simpler and reduces the installation difficulty. The thread design of the upper flange 1 makes the installation of the sealing ring 6 more firm and prevents misalignment during installation, ensuring the accuracy of installation.

[0023] The line seal method has better elasticity and adaptability, can effectively compensate for the thermal deformation of the flange caused by temperature changes, and thus maintain the integrity of the seal. For the furnace nose tip of the galvanizing unit operating in a high-temperature environment, it ensures that the airtightness of the furnace nose tip area is not affected by temperature changes. The stable sealing structure reduces the number of equipment shutdowns and repairs caused by seal failure, thus extending the service life of the furnace nose tip of the galvanizing unit and related equipment. At the same time, the stable seal also improves the overall stability of the equipment and ensures the continuity and stability of the galvanizing process.

[0024] In some embodiments, the high-temperature sealing packing 4 is a graphite fiber braided packing.

[0025] The graphite fiber braided packing can maintain stable performance in a high-temperature environment, usually withstand temperatures up to 600 °C or even higher without melting or decomposing, ensuring the sealing effect in a high-temperature working environment such as the furnace nose tip of the galvanizing unit. The graphite fiber braided packing has good flexibility and resilience, can adapt to different-shaped sealing interfaces, and ensures the tightness of the seal. At the same time, when subjected to pressure, it can be further compressed to better prevent the leakage of the medium.

[0026] The installation process of the graphite fiber braided packing is relatively simple and is achieved by filling the sealing groove 3. At the same time, it has good wear resistance and corrosion resistance, making the maintenance cost relatively low.

[0027] In some embodiments, the materials of the upper flange 1 and the lower flange 2 are 316L stainless steel.

[0028] Design and manufacture according to the existing technology, without changing other parameters of the flange, only requiring the flange surface to be smooth and the material to be 316L stainless steel.

[0029] 316L stainless steel exhibits good corrosion resistance in seawater and various other media, and its corrosion resistance is better than that of 304 stainless steel. In particular, 316L stainless steel contains 2 - 3% molybdenum, which gives it excellent corrosion resistance in the face of complex chemical environments, especially outstanding performance in chloride environments. The nose tip area of the furnace may come into contact with various corrosive media, which is particularly important for the working environment of the nose tip of the galvanizing unit.

[0030] 316L stainless steel is easy to machine and weld, and is processed by various methods such as cold working and hot working. This makes the manufacturing process of the flange simpler and more efficient to achieve smooth requirements and reduces the manufacturing cost.

[0031] In some embodiments, refer to Figure 1 , the fastener 5 includes a bolt, a nut and a gasket, wherein the gasket is a graphite gasket.

[0032] The fastener 5 includes a bolt, a nut, a gasket, etc. During installation, it is required to tighten them one by one in sequence as required.

[0033] The graphite gasket has good sealing performance and effectively prevents leakage. Its high compressive strength and hardness enable it to fit tightly with the nut and connecting components to ensure the integrity of the seal. The graphite gasket can be used for a long time in high - temperature environments, and the maximum service temperature can usually reach several hundred degrees Celsius, which is suitable for industrial equipment such as hot - dip galvanizing units that need to withstand high temperatures. It has good corrosion resistance to a variety of chemical media, including strong acids, strong alkalis and organic solvents, etc., and can maintain stable sealing performance in corrosive environments.

[0034] It has a long service life. It can resist wear and deformation caused by long - term use, thus maintaining a lasting sealing effect. It can be cut and processed according to needs to adapt to different sealing requirements. At the same time, its installation process is relatively simple, and it can be easily placed between the nut and connecting components to achieve a tight seal.

[0035] In some embodiments, the high - temperature sealing packing 4 is coated with high - temperature sealant and fixed in the sealing groove 3.

[0036] The high-temperature sealant has excellent sealing performance and can fill the tiny gaps between the high-temperature sealing packing 4 and the sealing groove 3 to form a more compact sealing layer. This helps prevent medium leakage and ensures the integrity of the sealing structure. It can maintain stable performance in high-temperature environments and will not fail due to temperature changes. This enables the sealing structure to operate continuously under high-temperature conditions without worrying about a decline in sealing performance. It has strong adhesion and can firmly paste the high-temperature sealing packing 4 in the sealing groove 3 to prevent the high-temperature sealing packing 4 from falling off or loosening during operation due to vibration or pressure changes. Using the high-temperature sealant simplifies the installation process of the high-temperature sealing packing 4. During installation, simply place the high-temperature sealing packing 4 in the sealing groove 3 and apply an appropriate amount of high-temperature sealant. This reduces the installation difficulty and improves work efficiency. The high-temperature sealant can protect the high-temperature sealing packing 4 from the erosion of high temperature and corrosive media, thereby extending its service life. At the same time, it can also reduce equipment failures and downtime caused by the loosening or falling off of the high-temperature sealing packing 4.

[0037] In some embodiments, refer to Figure 1 , the two ends of the high-temperature sealing packing 4 are parallel bevel planes.

[0038] The design of the bevel plane enables the high-temperature sealing packing 4 to more easily form a tight contact surface during installation, reducing the possibility of leakage. When the packing is subjected to a pressing force, the bevel planes can fit together to form a more reliable sealing structure. This helps improve the stress distribution inside the high-temperature sealing packing 4. During the pressing process, the bevel planes can gradually compress and adapt to the shape of the sealing groove 3, thereby reducing problems such as packing damage or leakage caused by stress concentration.

[0039] This makes the installation process of the high-temperature sealing packing 4 more convenient. During installation, simply align the bevel planes of the packing and place them in the sealing groove 3, which reduces the installation difficulty and improves work efficiency. It enables the high-temperature sealing packing 4 to adapt to different working conditions. In high-temperature, high-pressure, or corrosive environments, the bevel plane can provide better sealing performance and durability.

[0040] The design of the bevel plane can reduce leakage and stress concentration problems and extend the service life of the high-temperature sealing packing 4. This reduces maintenance costs and improves the overall reliability of the equipment In some embodiments, the central through-holes of the upper flange 1 and the lower flange 2 are used as nitrogen inlet holes for circulating nitrogen.

[0041] Nitrogen is introduced to form a nitrogen protection layer, which effectively prevents external air or corrosive media from infiltrating into the system through the flange connection, thereby enhancing the sealing effect and ensuring the airtightness and integrity of the system. Nitrogen is an inert gas and is not prone to chemical reactions with other substances. By circulating nitrogen, the oxidation and corrosion rates of the flange connection and its surrounding components are significantly reduced, extending the service life of the equipment. Under high-temperature or high-pressure working conditions, circulating nitrogen can regulate temperature and pressure. As a cooling medium, it helps reduce the system temperature; at the same time, by adjusting the nitrogen flow rate, the internal pressure of the system is controlled to ensure that the equipment operates within a safe range. It helps maintain a stable environment inside the system, reducing fluctuations caused by temperature, pressure, or medium changes. This helps improve the stability and reliability of the system and ensures the normal operation of the equipment. Due to the role of the nitrogen protection layer, the wear and corrosion degrees of the flange connection and its surrounding components are reduced, thereby reducing the maintenance and replacement frequencies, lowering the maintenance cost, and improving the economy of the equipment.

[0042] In some embodiments, the sealing ring 6 is made of elastic polyurethane material.

[0043] Polyurethane material has excellent elasticity and can quickly return to its original shape after being subjected to external forces. This property enables the sealing ring 6 to maintain a tight sealing effect under various working conditions and effectively prevent medium leakage. Its wear resistance is significantly better than that of traditional rubber materials, and even in some extreme working conditions, its wear resistance exceeds that of metal materials. The sealing ring 6 can maintain a low wear rate during long-term use, extending its service life. It has good tolerance to a variety of chemical media, including oils, aliphatic hydrocarbons, brines, etc. This enables the sealing ring 6 to maintain stable sealing performance in a corrosive environment and ensure the safe operation of the equipment. The hardness of the polyurethane material is achieved by adjusting the proportion of components in the formula. This enables the sealing ring 6 to be customized with a suitable hardness according to specific application requirements to meet different sealing requirements.

[0044] In some embodiments, the sealing ring 6 has a pre-tightening force for self-adaptive shape adjustment.

[0045] The pre-tightening force can ensure that the sealing ring 6 forms a tight contact with the flange or connecting components during installation, thereby effectively preventing medium leakage. When the sealing ring 6 is subjected to pressure, its ability to self-adaptively adjust its shape can further ensure the integrity of the seal. Even when the working conditions change in terms of temperature and pressure fluctuations, it can maintain a stable sealing effect. This enables the sealing ring 6 to adapt to flanges or connecting components of different sizes and shapes. It simplifies the installation process, reduces the requirements for installation accuracy, and at the same time improves the versatility and flexibility of the sealing ring 6.

[0046] The sealing ring 6 can adaptively adjust its shape, which can reduce stress concentration and wear problems caused by improper installation or changes in working conditions. It extends the service life of the sealing ring 6, reduces the replacement frequency, and thus lowers the maintenance cost. The sealing ring 6 with pre-tightening force and the ability to adaptively adjust its shape can reduce the system downtime caused by seal failure, and improve the stability and reliability of the system.

[0047] In some embodiments, the sealing ring 6 is detachable.

[0048] The design of the threaded connection enables the sealing ring 6 to be easily installed and removed without complex tools or procedures. This greatly reduces the difficulty of installation and maintenance and improves work efficiency. The sealing ring 6 can be easily removed, and the inspection and replacement processes become very simple. It helps to promptly detect and solve problems, preventing system downtime or damage caused by seal failure. It makes the entire device easier to operate when maintenance is required. The maintenance personnel can quickly remove the sealing ring 6, inspect and repair the interior of the device, and then reinstall the sealing ring 6 to restore the normal operation of the device.

[0049] The sealing ring 6 with a threaded connection can be replaced with sealing rings 6 of different materials, sizes or models according to actual needs to adapt to different working conditions and media. This flexibility helps to optimize the performance of the device and improve its adaptability. The sealing ring 6 with a threaded connection is easy to replace. When the sealing ring 6 is worn or damaged, only the damaged part needs to be replaced, rather than the entire device or component. It reduces the maintenance and replacement costs and improves the economy of the device.

[0050] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solutions of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0051] In addition, it should be noted that for the various specific technical features described in the above specific embodiments, without contradiction, they can be combined in any suitable way. To avoid unnecessary repetition, the present invention will not separately describe various possible combination methods.

[0052] Furthermore, any combination can be made among the various different embodiments of the present invention as long as it does not violate the idea of the present invention, and it should also be regarded as the content disclosed by the present invention.

Claims

1. A sealing device for the furnace nose of a hot-dip galvanizing unit, characterized in that, including an upper flange (1), a lower flange (2), a high-temperature sealing packing (4), fasteners (5) and a sealing ring (6); the upper flange (1) and the lower flange (2) are fixed by the fasteners (5); a sealing groove (3) is formed in the contact surface of the lower flange (2), and the high-temperature sealing packing (4) is placed in the sealing groove (3); threads are provided on the contact surface of the upper flange (1) and the lower flange (2) for threaded connection with the sealing ring (6).

2. The sealing device of the furnace nose of a hot-dip galvanizing unit according to claim 1, characterized in that the high-temperature sealing packing (4) is a graphite fiber braided packing.

3. The sealing device of the furnace nose of the hot-dip galvanizing unit according to claim 1, characterized in that, the upper flange (1) and the lower flange (2) are made of 316L stainless steel.

4. The sealing device of the furnace nose of the hot-dip galvanizing unit according to claim 1, characterized in that, the fasteners include bolts, nuts and gaskets, wherein the gasket is a graphite gasket.

5. The sealing device of the furnace nose of a hot-dip galvanizing unit according to claim 1, characterized in that the high-temperature sealing packing (4) is coated with a high-temperature sealant and fixed in the sealing groove (3).

6. The sealing device of the furnace nose of a hot-dip galvanizing unit according to claim 1, characterized in that the two ends of the high-temperature sealing packing (4) are parallel bevel planes at the joints.

7. The sealing device of the furnace nose of a hot-dip galvanizing unit according to claim 1, characterized in that the central through holes of the upper flange (1) and the lower flange (2) serve as nitrogen inlet holes for circulating nitrogen.

8. The sealing device of the furnace nose of a hot-dip galvanizing unit according to claim 1, characterized in that the sealing ring (6) is made of an elastic polyurethane material.

9. The sealing device of the furnace nose of a hot-dip galvanizing unit according to claim 1, characterized in that the sealing ring (6) has a pre-tightening force for self-adaptively adjusting the shape.

10. The sealing device of the furnace nose of the hot-dip galvanizing unit according to claim 1, characterized in that, the sealing ring (6) is detachable.

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