Air pre-heater sealing structure

Abstract

The utility model discloses an air pre-heater sealing structure, which belongs to the technical field of air pre-heaters and comprises a first pipeline and a second pipeline, a first flange is mounted on the right side of the first pipeline, a second flange is mounted on the left side of the second pipeline, and the first flange and the second flange are fixed through bolts. Sealing pipes are installed in the first pipeline and the second pipeline, a first sealing ring and a second sealing ring are arranged at the left end and the right end of each sealing pipe correspondingly, limiting sleeves are arranged at the upper position and the lower position of the second pipeline correspondingly, grooves are formed in the surfaces of the sealing pipes, and the limiting sleeves are connected with the grooves in a clamped mode to form a fixing structure for the sealing pipes. Protruding blocks are arranged at the left end and the right end of the sealing pipe. The air pre-heater sealing structure solves the problems that an existing air pre-heater sealing structure is complex and troublesome in installation step, has the advantages of being simple in structure, convenient and accurate to install and maintain and good and stable in sealing effect, can effectively prevent air leakage and improve the heat efficiency of the air pre-heater, and is suitable for sealing connection of various air pre-heaters.

Description

Technical Field

[0001] This utility model relates to the field of air preheater technology, specifically to an air preheater sealing structure. Background Technology

[0002] An air preheater, also known as an air preheater unit, is a key component of modern power plant boilers, industrial kilns, and other thermal equipment. Its core function is to use waste heat from flue gas to heat the air needed for combustion. During operation, hot flue gas flows through pipes, transferring heat to the isolated cold air. The cold air then enters the combustion zone after being heated. Air preheaters come in various types, commonly tubular and rotary, and are widely used in industries such as power, metallurgy, and chemicals. They are important equipment for achieving energy conservation, emission reduction, and improving the economic efficiency of thermal systems. Air preheaters require pipes to connect their flue gas inlet and outlet, as well as their air inlet and outlet. However, gaps often appear at these pipe connections, allowing air to enter the unit from the outside, causing leakage and severely impacting the boiler's thermal efficiency. Existing air preheater sealing structures also have certain problems: the complexity of multi-stage linkage sealing structures; flange connection interface sealing failure; insufficient radial thermal displacement compensation; and environmental adaptability defects.

[0003] Current technological improvement challenges: Although improvements have been made in recent years, such as flexible graphite seals and hydraulic compensation systems, none of them have overcome the fundamental limitations: Flexible seals: Although the air leakage rate has been reduced to 6%-8%, the material's temperature resistance limit is only 450℃, which cannot meet the requirements of supercritical units; Hydraulic systems: Complex pipelines increase the failure rate by 25% and increase maintenance costs by 3-5 times.

[0004] In view of this, in-depth research was conducted on the above issues, which led to the creation of this case. Utility Model Content

[0005] The purpose of this invention is to provide an air preheater sealing structure to solve the problems of complex sealing structures and cumbersome installation steps mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] An air preheater sealing structure includes a first pipe and a second pipe. A first flange is installed on the right side of the first pipe, and a second flange is installed on the left side of the second pipe. The first flange and the second flange are fixed by bolts. A sealing pipe is installed inside the first pipe and the second pipe. A first sealing ring and a second sealing ring are provided at both ends of the sealing pipe. Limit sleeves are provided at the upper and lower positions of the second pipe. A groove is provided on the surface of the sealing pipe. The limit sleeve engages with the groove to form a fixing structure for the sealing pipe. Protrusions are provided at both ends of the sealing pipe.

[0008] Preferably, mounting plates are fixedly installed at both the upper and lower positions on the left side of the second pipe, and a knob is provided on the rear side of the mounting plate via a connecting ratchet.

[0009] By adopting the above technical solution, the mounting plate on the upper and lower left side of the second pipeline and the knob of the ratchet connected to the rear side allow the operator to easily operate the limiting sleeve by rotating the knob and using the ratchet structure to adjust the position of the limiting sleeve, thereby facilitating the installation and disassembly of the sealing pipe and improving the convenience of maintenance.

[0010] Preferably, the rotating knob is connected to the front side of the mounting plate with a limiting sleeve, and the limiting sleeve is semi-circular. The limiting sleeve has a disc inside, and the diameter of the disc is smaller than the diameter of the limiting sleeve.

[0011] Using the above technical solution, the rotary knob passes through the semi-circular limiting sleeve connected to the front side of the mounting plate and the disc set inside. The semi-circular limiting sleeve is easy to cooperate with the groove on the surface of the sealing tube, and the disc can rotate inside the limiting sleeve. When the rotary knob is rotated, the disc can interact with the sliding groove on the right side of the sealing tube, providing precise guidance for the installation and positioning of the sealing tube and enhancing the accuracy of the sealing tube installation.

[0012] Preferably, the second pipe has slots extending through both its upper and lower positions, and the limiting sleeve and the disc portion extend through the slots.

[0013] Using the above technical solution, the second pipe passes through the slot at the top and bottom, and the limiting sleeve and the disc part pass through the inside of the slot, providing space for the movement of the limiting sleeve and the disc.

[0014] Preferably, the sealing tube has grooves at both the upper and lower right sides, and the grooves provide sliding space for the moving contact disc of the sealing tube.

[0015] The above technical solution provides sliding space for the moving contact disc of the sealing tube by opening the upper and lower positions on the right side of the sealing tube. This allows the sealing tube to move smoothly along the sliding groove during installation and disassembly, avoiding collisions or friction damage between the sealing tube and other components, and extending the service life of the sealing tube.

[0016] Preferably, the groove surrounds the sealing tube, and the inner side of the groove has a curved surface structure.

[0017] By adopting the above technical solution, the groove surrounding the sealing tube and having a curved inner surface is engaged with the limiting sleeve. The curved groove can better fit the limiting sleeve, improving the stability of the sealing tube and ensuring that the sealing tube will not easily shake or shift during use, thus guaranteeing the sealing effect.

[0018] Preferably, the outer side of the protrusion has a curved structure, and the protrusion contacts the first sealing ring and the second sealing ring to form a compression structure.

[0019] By adopting the above technical solution, the outer curved protrusions contact the first and second sealing rings to form a compression structure. When the curved protrusions compress the sealing rings, the sealing rings are subjected to more uniform force, which further enhances the sealing effect, effectively prevents air leakage, and improves the thermal efficiency of the air preheater.

[0020] Compared with the prior art, the beneficial effects of this utility model are: the air preheater sealing structure,

[0021] 1. Convenient and precise installation and maintenance: Through the coordinated action of components such as mounting plate, knob, limit sleeve, disc, slot and slide, when the knob is turned, the disc can interact with the slide on the right side of the sealing tube, providing precise guidance for the installation and positioning of the sealing tube, enhancing the accuracy of the sealing tube installation, making the installation and disassembly of the sealing tube simple and accurate, and reducing the time and labor costs of installation and maintenance;

[0022] 2. Good and stable sealing effect: The compression structure of the first sealing ring and the second sealing ring at both ends of the sealing tube with the protrusion, as well as the tight engagement of the groove and the limiting sleeve, together ensure the stability of the sealing structure and good sealing performance, effectively preventing air leakage and improving the working efficiency of the air preheater. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the appearance and structure of this utility model;

[0024] Figure 2 This is a schematic diagram of the rear structure of this utility model;

[0025] Figure 3 This is a cross-sectional structural diagram of the present invention;

[0026] Figure 4 This is a schematic diagram of the internal explosion structure of the pipeline of this utility model;

[0027] Figure 5 This is a schematic diagram of the second pipeline structure of this utility model.

[0028] In the diagram: 1. First pipe; 2. Second pipe; 3. First flange; 4. Second flange; 5. Mounting plate; 6. Rotary knob; 7. Limiting sleeve; 8. Disc; 9. Groove; 10. Sealing pipe; 11. Protrusion; 12. Slide groove; 13. Groove; 14. First sealing ring; 15. Second sealing ring. Detailed Implementation

[0029] 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.

[0030] Please see Figure 1-5 This utility model provides a technical solution:

[0031] An air preheater sealing structure includes a first pipe 1 and a second pipe 2. A first flange 3 is installed on the right side of the first pipe 1, and a second flange 4 is installed on the left side of the second pipe 2. The first flange 3 and the second flange 4 are fixed by bolts. A sealing pipe 10 is installed inside the first pipe 1 and the second pipe 2. A first sealing ring 14 and a second sealing ring 15 are provided at both ends of the sealing pipe 10. Limiting sleeves 7 are provided at both the upper and lower positions of the second pipe 2. A groove 13 is provided on the surface of the sealing pipe 10. The limiting sleeves 7 engage with the grooves 13 to form a fixed structure for the sealing pipe 10. A protrusion 11 is provided at both ends of the sealing pipe 10.

[0032] Mounting plates 5 are fixedly installed at both the upper and lower left sides of the second pipe 2. A rotating knob 6 is connected to a ratchet on the rear side of the mounting plate 5. The rotating knob 6 passes through the front side of the mounting plate 5 and connects to a limiting sleeve 7. The limiting sleeve 7 is semi-circular, and a disc 8 is installed inside the limiting sleeve 7, with the diameter of the disc 8 being smaller than the diameter of the limiting sleeve 7. Slots 9 are drilled through both the upper and lower left sides of the second pipe 2, with portions of the limiting sleeve 7 and the disc 8 passing through the slots 9. The mounting plates 5 at the upper and lower left sides of the second pipe 2 and the rotating knob 6 connected to the ratchet on the rear side utilize a ratchet structure, allowing the operator to more easily... The position of the limiting sleeve 7 can be adjusted easily and precisely by rotating the knob 6, enabling the installation and removal of the sealing tube 10 without complicated operations, thus reducing maintenance difficulty. The semi-circular limiting sleeve 7 and the small-diameter inner disc 8 are designed to fit easily into the groove 13 of the sealing tube 10. The disc 8 can rotate flexibly, providing more precise guidance for the installation and adjustment of the sealing tube 10, ensuring the accurate installation position of the sealing tube 10 and enhancing the sealing effect. The slot 9 provides space for the movement of the limiting sleeve 7 and the disc 8, making it easy for operators to identify problems and make adjustments in a timely manner.

[0033] The sealing tube 10 has grooves 12 on both the upper and lower right sides, and the grooves 12 provide sliding space for the moving contact disc 8 of the sealing tube 10. The groove 13 surrounds the sealing tube 10, and the inner side of the groove 13 has a curved structure. The groove 12 on the right side of the sealing tube 10 provides a standard track for the relative movement of the disc 8 and the sealing tube 10, so as to avoid damage to the sealing tube 10 due to displacement during installation, disassembly or operation, and ensure the integrity and service life of the sealing tube 10. The groove 13 surrounding the sealing tube 10 and having a curved inner side increases the contact area and friction with the limiting sleeve 7, making the sealing tube 10 more firmly fixed. It can also maintain stability when the air preheater vibrates during operation and continue to play a good sealing role.

[0034] The outer side of the protrusion 11 has a curved structure, and the protrusion 11 touches the first sealing ring 14 and the second sealing ring 15 to form a compression structure. The compression structure of the outer side of the protrusion 11 with the first sealing ring 14 and the second sealing ring 15, the curved design makes the compression force of the protrusion 11 on the sealing ring more uniform, further fills the gap, effectively prevents air leakage, and improves the heat exchange efficiency of the air preheater.

[0035] Working principle:

[0036] When using this utility model, during the installation of the air preheater sealing structure, first place the sealing tube 10 inside the first pipe 1 and the second pipe 2, and move it to the right until the slide groove 12 moves to the right side of the disc 8, so that the disc 8 is located inside the groove 13. At this time, the sealing tube 10 can be sealed, so that the slide groove 12 is located on the front and rear sides inside the pipe. Rotate the rotating knob 6, and the rotating knob 6 drives the limiting sleeve 7 to rotate. The disc 8 inside the limiting sleeve 7 rotates accordingly until the groove 13 on the surface of the sealing tube 10 is engaged with the limiting sleeve 7. At this time, the sealing tube 10 is installed in place, and the protrusion 11 presses the first sealing ring 14 and the second sealing ring 15 to form a good seal.

[0037] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0038] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An air preheater sealing structure, comprising a first pipe (1) and a second pipe (2), a first flange (3) is installed on the right side of the first pipe (1), and a second flange (4) is installed on the left side of the second pipe (2), and the first flange (3) and the second flange (4) are fixed by bolts, characterized in that: The first pipeline (1) and the second pipeline (2) are internally provided with a sealing pipe (10), and the left and right ends of the sealing pipe (10) are provided with a first sealing ring (14) and a second sealing ring (15); the upper and lower positions of the second pipeline (2) are provided with a limiting sleeve (7); the surface of the sealing pipe (10) is provided with a groove (13); the limiting sleeve (7) is clamped with the groove (13) to form a fixed structure for the sealing pipe (10); and the left and right ends of the sealing pipe (10) are provided with a protruding block (11).

2. The seal structure for an air preheater according to claim 1, wherein: The left side of the second pipeline (2) is fixedly provided with a mounting plate (5) at the upper and lower positions, and the rear side of the mounting plate (5) is provided with a rotating knob (6) through a connecting ratchet.

3. The seal structure for an air preheater according to claim 2, wherein: The rotating knob (6) penetrates through the front side of the mounting plate (5) and is connected with a limiting sleeve (7), and the limiting sleeve (7) is semicircular; the inside of the limiting sleeve (7) is provided with a disc (8), and the diameter of the disc (8) is smaller than the diameter of the limiting sleeve (7).

4. The seal structure for an air preheater according to claim 3, wherein: The upper and lower positions of the second pipeline (2) are provided with a slot hole (9), and the limiting sleeve (7) and the disc (8) are partially penetrated into the inside of the slot hole (9).

5. The seal structure for an air preheater as claimed in claim 1, wherein: The upper and lower positions of the right side of the sealing pipe (10) are provided with a sliding groove (12), and the sliding groove (12) provides a sliding space for the moving disc (8) of the sealing pipe (10).

6. A seal structure for an air preheater as defined in claim 1, wherein: The groove (13) surrounds the sealing pipe (10), and the inner side of the groove (13) is in a curved surface structure.

7. The seal structure for an air preheater according to claim 1, wherein: The outer side of the protruding block (11) is in a curved surface structure, and the protruding block (11) contacts the first sealing ring (14) and the second sealing ring (15) to form an extrusion structure.

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