Airtight seal device for rotary regenerative air preheater

Abstract

The application discloses a rotary heat accumulating air preheater air-tight sealing device, which comprises an outer sleeve, a center sleeve, a radial sealing assembly and an axial sealing assembly, both ends of the center sleeve are fixedly connected with sealing rings, a plurality of radial baffles are fixedly connected to the center sleeve, the outer side edges of the radial baffles are connected with the axial sealing assembly, the upper and lower side edges of the radial baffles are respectively provided with the radial sealing assembly, one end of the radial sealing assembly is connected with the outer periphery of the sealing ring, the outer end of the sealing ring is rotatably connected with a ring sleeve plate, a driving shaft is rotatably connected to the middle part of the ring sleeve plate, the outer periphery edge of the ring sleeve plate is fixedly connected with a plurality of fan-shaped plates, and the outer end of the fan-shaped plate is fixedly connected with the inner wall of the outer sleeve. The application aims to provide an air preheater air-tight sealing device with good sealing effect, reduced friction loss, prolonged service life, reduced maintenance cost and complexity.

Description

Technical Field

[0001] This invention relates to the field of rotary air preheater sealing technology, specifically to a rotary regenerative air preheater air sealing device. Background Technology

[0002] With the continuous advancement of industrial technology and the improvement of energy utilization efficiency, air preheaters are being used more and more widely in combustion systems. The main function of an air preheater is to increase the temperature of combustion air, thereby improving fuel combustion efficiency and reducing fuel consumption and pollutant emissions. Traditional air preheaters typically employ a fixed structure, but this structure suffers from problems such as low heat exchange efficiency, large heat loss, and difficult maintenance. Therefore, rotary regenerative air preheaters have emerged.

[0003] Rotary regenerative air preheaters achieve efficient heat exchange between flue gas and air through the rotation of an internal rotor. The rotor includes components such as multiple radial baffles, sealing rings, and heat exchange units, which drive heat transfer between the flue gas and air during rotation. However, ensuring efficient sealing and preventing leakage between the flue gas and air during rotation is a major technical challenge for this type of device.

[0004] In existing technologies, common sealing methods include sliding seals and brush seals. However, these methods often suffer from poor sealing performance, high frictional losses, and short service life. Especially in high-temperature and high-dust environments, the sealing materials are prone to wear, leading to a decline in sealing performance and consequently affecting the overall efficiency and stability of the air preheater.

[0005] To address the aforementioned problems, this invention proposes an improved gas-sealing device for a rotary regenerative air preheater. This device, through optimized structural design and a combination of rolling seals and sealing brushes, achieves a significant improvement in sealing performance, effectively solving the problems of high wear and poor sealing effect inherent in existing technologies. Summary of the Invention

[0006] In view of the above-mentioned shortcomings in the existing technology, the purpose of this invention is to provide an air preheater air sealing device with good sealing effect, reduced friction loss, improved device service life, and reduced maintenance cost and complexity.

[0007] The technical solution adopted by the present invention to achieve the above-mentioned objective is: a rotary regenerative air preheater gas sealing device, comprising a regenerative air preheater, wherein the regenerative air preheater includes an outer sleeve, a central cylinder, a drive shaft, an annular plate, a sector plate, a radial sealing assembly, and an axial sealing assembly. The drive shaft is connected to the middle of the central cylinder, and sealing rings are fixedly connected to both ends of the central cylinder. A plurality of radial partitions are fixedly connected to the central cylinder between the sealing rings. The radial partitions are evenly spaced along the circumference of the central cylinder. Both the radial partitions and the central cylinder are rotatably connected within the outer sleeve. A heat exchange unit is arranged within the space formed by the outer sleeve, radial partition, and central cylinder. An axial sealing assembly is connected to the outer edge of the radial partition, and the axial sealing assembly is slidably connected to the inner wall of the outer sleeve. Radial sealing assemblies are respectively arranged on the upper and lower sides of the radial partition. One end of the radial sealing assembly is connected to the outer periphery of the sealing ring. A ring sleeve plate is rotatably connected to one side of the outer end of the sealing ring. The drive shaft is rotatably connected to the middle of the ring sleeve plate. Several sector plates are fixedly connected to the outer periphery of the ring sleeve plate. One side of the outer end of each sector plate is fixedly connected to the inner wall of the outer sleeve. The radial sealing assembly is slidably connected to each sector plate.

[0008] In this invention, the outer sleeve is the outer shell of the entire air preheater, used for fixing and supporting the device. The central cylinder is the inner bearing part, connected to the drive shaft, which can drive the internal rotor (the rotor includes radial baffles, sealing rings, heat exchange units, etc.) to rotate. The ring sleeve cooperates with the outer sleeve to support and fix the sector plate. The sealing ring is fixedly connected to both ends of the central cylinder to ensure the sealing of the device during rotor rotation. The radial baffle is used to divide the heat exchange unit, ensuring the distribution and guidance of flue gas flow and air flow, and providing support for the heat exchange unit. The axial sealing assembly and the inlet sealing assembly are respectively set on the outer peripheral edge of the radial baffle to improve the sealing between the radial baffle and other components, and ensure the sealing when flue gas and air flow.

[0009] In the above technical solution, the radial sealing assembly includes a mounting plate and a sealing plate. The mounting plate is provided on the radial partition on one side along the rotation direction. A first sealing brush is provided on the upper end of the mounting plate. A sealing plate is provided on the other side of the radial partition. A buffer plate is connected to one side of the sealing plate. A fixed plate is connected to one side of the buffer plate. A movable plate is rotatably connected to the upper end of the fixed plate. A rolling seal is fixedly connected to the upper end of the movable plate. A spring is connected to the lower end of the movable plate. The lower end of the spring is fixedly connected to a support plate. One side of the support plate is fixedly connected to the fixed plate. Several reinforcing ribs are fixedly connected between the lower end face of the support plate and the fixed plate. Several first pressure plates are provided on the outer side of the fixed plate. Several second pressure plates are provided on the outer side of the mounting plate. The second pressure plates correspond to the first pressure plates respectively. A first bolt passes through the first pressure plate, the fixed plate, the buffer plate, the sealing plate, the radial partition, the mounting plate, and the second pressure plates in sequence and is threadedly connected to the first nut.

[0010] In the above technical solution, the spring component includes an upper rotating support, a lower rotating support, a telescopic rod, and a helical spring. The upper rotating support is fixedly connected to one side of the lower end of the movable plate, and the lower rotating support is fixedly connected to one side of the upper end of the support plate. A telescopic rod is fixedly connected between the upper rotating support and the lower rotating support. A helical spring is sleeved on the telescopic rod. One end of the helical spring abuts against the upper rotating support, and the other end of the helical spring abuts against the lower rotating support.

[0011] In the above technical solution, the rolling seal includes a rolling frame, a fixed shaft, a rotating bearing, an isolation disc, and a spring plate. Several evenly arranged rolling frames are connected to the upper end of the movable plate. A second bolt passes through the movable plate and the rolling frames in sequence and is threadedly connected to a second nut. A rotating groove is provided on the rolling frame, and a fixed shaft is fixedly connected within the rotating groove. Several isolation discs are fixedly connected to the fixed shaft. Rotating bearings are respectively connected to the fixed shafts on both sides of the isolation discs. Rotating wheels are fixedly connected to the outer periphery of the rotating bearings. The rotating wheels are rotatably connected to the sector plates. A spring plate is fixedly connected between two adjacent sets of rolling frames by screws. The middle section of the spring plate has an S-shaped corrugation, and the end section of the spring plate has a circular arc structure. The outer arc surface of the circular arc structure is slidably connected to the sector plate.

[0012] In the above technical solution, the first sealing brush includes a clamping plate, a third bolt, a third nut, a fourth bolt, a fourth nut, and a first steel wire rope. The upper edge of the mounting plate is connected to clamping plates on both sides. The third bolt passes through the clamping plate and the mounting plate in sequence and is threaded to the third nut. Several first steel wire ropes stacked in layers are connected between the clamping plates at the upper end of the mounting plate. One end of the first steel wire rope passes through the clamping plate and forms a brush bristle structure, which contacts the fan-shaped plate. The fourth bolt passes through two sets of clamping plates and passes through the first steel wire rope located in the middle and is threaded to the fourth bolt.

[0013] In the above technical solution, the axial sealing assembly includes a second sealing brush, a brush handle, a third sealing brush, and a flexible steel sheet sealing brush. The second sealing brush is fixedly connected to the radial partition on one side of the rotation direction, and the brush handle is fixedly connected to the other side of the radial partition. The upper end of the brush handle is bent away from the radial partition at a bending angle of 45°. The third sealing brush is connected to one side of the brush handle at the upper end of the bent portion, and the flexible steel sheet sealing brush is fixedly connected to the other side of the brush handle at the upper end of the bent portion.

[0014] In the above technical solution, the second sealing brush includes a first pressure cap, a second steel wire rope, a front-bending pressure plate, and a rear-bending pressure plate. The first pressure cap is connected to the radial partition located on one side of the rotation direction. A first mounting groove is formed on one side of the first pressure cap. A plurality of second steel wire ropes are stacked in layers in the first mounting groove. A rear-bending pressure plate is connected to the opening of the first mounting groove. One side of the rear-bending pressure plate abuts against the stacked second steel wire ropes, and the other side of the rear-bending pressure plate abuts against the radial partition. The upper end of the rear-bending pressure plate extends out of the first mounting groove and then radially... The second steel wire rope is bent towards the partition, and one end of the second steel wire rope passes through the mounting groove to form a brush structure. The brush structure contacts the inner wall of the outer sleeve. A forward bending pressure plate is fixedly connected to one side of the edge of the first pressure plate. The upper end of the forward bending pressure plate is bent towards the second steel wire rope at a bending angle of 10°. A first pad is provided on one side of the brush handle, and a second pad is provided on one side of the outer end of the first pressure plate. A fifth bolt passes through the first pad, brush handle, radial partition, backward bending pressure plate, second steel wire rope, first pressure plate and second pad in sequence and is threaded to the fifth nut.

[0015] In the above technical solution, the third sealing brush includes a second pressure cap, a third steel wire rope, and a pressing plate. The second pressure cap is connected to one side of the upper end of the brush handle. A second mounting groove is opened on the second pressure cap facing the brush handle. Several third steel wire ropes are stacked in layers in the second mounting groove. The pressing plate is connected to the opening of the second mounting groove. One side of the pressing plate abuts against the stacked third steel wire ropes, and the other side of the pressing plate abuts against the brush handle. One end of the third steel wire rope passes through the second mounting groove to form a brush structure, which contacts the inner wall of the outer sleeve.

[0016] In the above technical solution, the flexible steel sheet sealing brush includes flat steel, thin plate, and third pressure plate. The other side of the upper end of the brush handle is fixed by stacking thin plate and flat steel in sequence. The outermost layer of the stacked structure always ends with thin plate, and the third pressure plate is connected to the outermost thin plate. Flat steel extends from one side of the thin plate to form a multi-layer brush strip, which contacts the inner side of the outer sleeve. The sixth bolt passes through the second pressure cover, the third steel wire rope, the extrusion plate, the stacked layer formed by the thin plate and flat steel, and the third pressure plate in sequence, and is then threadedly connected to the sixth nut.

[0017] In the above technical solution, the first wire rope has two or more stacked layers, and the second and third wire ropes have three or more stacked layers. The first, second, and third wire ropes are all made of stainless steel. Each group of thin plates consists of two or more layers of stainless steel sheets. The number of thin plate groups is one more than the number of flat steel groups. The number of flat steel groups is three or more layers, and the flat steel and thin plates are arranged alternately.

[0018] The beneficial effects of this invention are:

[0019] 1. Significantly Improved Sealing Performance: This invention, through the rational design of radial and axial sealing components and the combination of rolling seals and sealing brushes, effectively prevents leakage between flue gas and air. Especially under high temperature and high pressure environments, the seals maintain long-term stability, avoiding the leakage problems common in traditional sealing methods.

[0020] 2. Significantly Reduced Friction Loss: The rolling seal design replaces traditional sliding friction with rolling friction between the rotating wheel and the sealing plate, effectively reducing friction loss and energy consumption. This design not only improves the device's operating efficiency but also significantly extends the service life of the seals, thereby reducing maintenance frequency and operating costs.

[0021] 3. Modular design for easy maintenance: The modular design of this device simplifies the replacement and maintenance of sealing components. By replacing damaged rolling elements or seals, the equipment can be quickly repaired, reducing downtime, lowering maintenance costs and complexity, and improving the reliability and stability of the equipment.

[0022] 4. Long service life: The combined design of the rolling seal and the sealing brush effectively extends the service life of the sealing system. Especially in high temperature, high pressure, and highly corrosive environments, the durability of the seal is greatly improved, reducing failures and equipment downtime caused by wear of the sealing material.

[0023] 5. Improved durability and stability of the sealing system: The axial sealing assembly, through a combination of multi-layer steel wire rope and stainless steel sheets, provides higher sealing strength and durability. Furthermore, the use of flexible steel sheet sealing brushes increases the flexibility of the sealing system, enabling it to adapt to minor deformations during long-term operation and maintain excellent sealing performance.

[0024] 6. Environmental benefits: This invention effectively avoids pollution to the environment caused by flue gas leakage, optimizes heat exchange efficiency, and further improves the overall performance of the rotary regenerative air preheater, thereby helping to reduce energy consumption and pollutant emissions, which meets the requirements of modern industrial green production.

[0025] In summary, this invention has not only made significant progress in sealing performance, friction loss, and service life, but also improved the maintainability and environmental benefits of the equipment, and has broad application prospects and market value. Attached Figure Description

[0026] Figure 1 This is a three-dimensional structural diagram of the regenerative air preheater of the present invention;

[0027] Figure 2 This is a schematic cross-sectional view of the radial sealing assembly of the present invention;

[0028] Figure 3 This is a schematic diagram of the connection structure of adjacent rolling seals in this invention;

[0029] Figure 4 for Figure 3 Schematic diagram of the structure of part A1 in the middle;

[0030] Figure 5 This is a schematic diagram of the spring component connection structure of the present invention;

[0031] Figure 6 This is a schematic diagram of the cross-sectional structure of the first sealing brush of the present invention;

[0032] Figure 7 This is a schematic cross-sectional view of the axial sealing assembly of the present invention;

[0033] Figure 8 This is a schematic diagram of the cross-sectional structure of the second sealing brush of the present invention;

[0034] Figure 9This is a schematic diagram of the cross-sectional connection structure between the third sealing brush and the flexible steel sheet sealing brush of the present invention.

[0035] In the diagram: 1 Outer sleeve, 2 Center cylinder, 3 Drive shaft, 4 Ring plate, 5 Sector plate, 6 Radial sealing assembly, 7 Axial sealing assembly, 8 Sealing ring, 9 Radial partition, 10 Heat exchange unit, 601 Mounting plate, 602 Sealing plate, 603 First sealing brush, 604 Buffer plate, 605 Fixed plate, 606 Movable plate, 607 Rolling seal, 608 Spring, 609 Support plate, 610 Reinforcing rib, 611 First pressure plate, 612 Second pressure plate, 613 First bolt, 614 First nut, 6071 Rolling frame, 6072 Fixed shaft, 6073 Rotating bearing, 6074 Isolation disc, 6075 Spring plate, 6076 Second bolt, 6077 Second nut, 6078 Rotating groove, 6079 Rotating wheel, 60710 Screw, 6081 Upper rotating support 6082 Lower rotating support, 6083 Telescopic rod, 6084 Helical spring, 6031 Clamping plate, 6032 Third bolt, 6033 Third nut, 6034 Fourth bolt, 6035 Fourth nut, 6036 First wire rope, 701 Second sealing brush, 702 Brush handle, 703 Third sealing brush, 704 Flexible steel sheet sealing brush, 7011 First pressure cap, 7012 Second wire rope, 7013 Front bending pressure plate, 7014 Rear bending pressure plate, 7015 First pad, 7016 Second pad, 7017 Fifth bolt, 7018 Fifth nut, 7031 Second pressure cap, 7032 Third wire rope, 7033 Extrusion plate, 7041 Flat steel, 7042 Thin plate, 7043 Third pressure plate, 7044 Sixth bolt, 7045 Sixth nut. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] Please see Figures 1-9A rotary regenerative air preheater gas sealing device includes a regenerative air preheater, comprising an outer sleeve 1, a central cylinder 2, a drive shaft 3, an annular plate 4, a sector plate 5, a radial sealing assembly 6, and an axial sealing assembly 7. The drive shaft 3 is connected to the middle of the central cylinder 2, and sealing rings 8 are fixedly connected to both ends of the central cylinder 2. A plurality of radial partitions 9 are fixedly connected to the central cylinder 2 between the sealing rings 8. The radial partitions 9 are evenly spaced along the circumference of the central cylinder 2. Both the radial partitions 9 and the central cylinder 2 are rotatably connected inside the outer sleeve 1. A heat exchange unit 10 is provided in the space formed by the partition 9 and the central cylinder 2. An axial sealing assembly 7 is connected to the outer edge of the radial partition 9. The axial sealing assembly 7 is slidably connected to the inner wall of the outer sleeve 1. Radial sealing assemblies 6 are respectively provided on the upper and lower sides of the radial partition 9. One end of the radial sealing assembly 6 is connected to the outer periphery of the sealing ring 8. A ring sleeve plate 4 is rotatably connected to one side of the outer end of the sealing ring 8. The drive shaft 3 is rotatably connected to the middle of the ring sleeve plate 4. Several sector plates 5 are fixedly connected to the outer periphery of the ring sleeve plate 4. One side of the outer end of the sector plate 5 is fixedly connected to the inner wall of the outer sleeve 1. The radial sealing assembly 6 is slidably connected to the sector plate 5.

[0038] In this invention, the outer sleeve 1 is the outer shell of the entire air preheater, used for fixing and supporting the device. The central cylinder 2 is the inner bearing part, connected to the drive shaft 3, which can drive the internal rotor (the rotor includes radial partitions 9, sealing rings 8, heat exchange units 10, etc.) to rotate. The ring sleeve 4 cooperates with the outer sleeve 1 to support and fix the sector plate 5. The sealing ring 8 is fixedly connected to both ends of the central cylinder 2 to ensure the sealing of the device during rotor rotation. The radial partitions 9 are used to divide the heat exchange units 10, ensuring the distribution and guidance of flue gas flow and air flow, and providing support for the heat exchange units 10. The axial sealing assembly 7 and the inlet sealing assembly are respectively set on the outer periphery of the radial partitions 9 to improve the sealing between the radial partitions 9 and other components, and to ensure the sealing when flue gas and air flow.

[0039] Please see Figures 2-6In one embodiment of the present invention, the radial sealing assembly 6 includes a mounting plate 601 and a sealing plate 602. The mounting plate 601 is disposed on a radial partition 9 along one side of the rotation direction. A first sealing brush 603 is disposed at the upper end of the mounting plate 601. The first sealing brush 603 achieves a sealing effect with the fan-shaped plate 5 through a brush structure formed by a steel wire rope. A sealing plate 602 is disposed on the other side of the radial partition 9. The upper end of the sealing plate 602 is as close as possible to the fan-shaped plate 5, thereby achieving a relative sealing effect through the obstruction of the sealing plate 602. A buffer plate 604 is connected to one side of the sealing plate 602, and a fixing plate 605 is connected to one side of the buffer plate 604. A movable plate 606 is rotatably connected to the upper end, and a rolling seal 607 is fixedly connected to the upper end of the movable plate 606. Several rotating wheels 6079 rotate side-by-side to achieve a sealing effect with the sector plate 5. The rotating wheels 6079 and the sealing plate 602 are in a rolling connection, which reduces frictional loss and improves the service life of the device. Furthermore, the fan-shaped surface of the sector plate 5 gradually increases the frictional length of the seal from the central cylinder 2 outwards. Through rolling friction, the frictional loss between the inner and outer rings can be minimized, further improving the service life of the device. A spring 608 is connected to the lower end of the movable plate 606. The spring 608 provides rated pressure to ensure the sealing between the rotating wheels 6079 and the sealing plate 5. The tight contact of the fan-shaped plates 5 ensures the sealing effect of the device. The lower end of the spring 608 is fixedly connected to the support plate 609. One side of the support plate 609 is fixedly connected to the fixed plate 605. Several reinforcing ribs 610 are fixedly connected between the lower end face of the support plate 609 and the fixed plate 605. Several first pressure plates 611 are provided on the outer side of the fixed plate 605, and several second pressure plates 612 are provided on the outer side of the mounting plate 601. The second pressure plates 612 correspond to the first pressure plates 611 respectively. The first bolt 613 passes through the first pressure plate 611, the fixed plate 605, the buffer plate 604, the sealing plate 602, the radial partition 9, the mounting plate 601, and the second pressure plates 612 in sequence. The plate 612 is threadedly connected to the first nut 614; the spring component 608 includes an upper rotating support 6081, a lower rotating support 6082, a telescopic rod 6083, and a coil spring 6084. The upper rotating support 6081 is fixedly connected to one side of the lower end of the movable plate 606, and the lower rotating support 6082 is fixedly connected to one side of the upper end of the support plate 609. The telescopic rod 6083 is fixedly connected between the upper rotating support 6081 and the lower rotating support 6082. The coil spring 6084 is sleeved on the telescopic rod 6083. One end of the coil spring 6084 abuts against the upper rotating support 6081, and the other end of the coil spring 6084 abuts against the lower rotating support 6082.The rolling seal 607 includes a rolling frame 6071, a fixed shaft 6072, a rotating bearing 6073, an isolation disc 6074, and a spring plate 6075. A plurality of evenly arranged rolling frames 6071 are connected to the upper end of the movable plate 606. A second bolt 6076 passes through the movable plate 606 and the rolling frames 6071 in sequence and is threadedly connected to a second nut 6077. A rotating groove 6078 is formed on the rolling frame 6071, and a fixed shaft 6072 is fixedly connected within the rotating groove 6078. A plurality of isolation discs 6074 are fixedly connected to the fixed shaft 6072, and rotating bearings 6075 are respectively connected to the fixed shaft 6072 on both sides of the isolation disc 6074. 073, a rotating wheel 6079 is fixedly connected to the outer periphery of the rotating bearing 6073. The rotating wheel 6079 is rotatably connected to the sector plate 5. A spring plate 6075 is fixedly connected between two adjacent sets of rolling frames 6071 by screws 60710. The middle section of the spring plate 6075 has an S-shaped corrugation, and the end section of the spring plate 6075 has a circular arc structure. The outer arc surface of the circular arc structure is slidably connected to the sector plate 5. The first sealing brush 603 includes a clamping plate 6031, a third bolt 6032, a third nut 6033, a fourth bolt 6034, a fourth nut 6035, and a first steel wire rope 6036. The mounting plate 601 is on A clamping plate 6031 is connected to both sides of the edge of the end. A third bolt 6032 passes through the clamping plate 6031 and the mounting plate 601 in sequence and is threaded to the third nut 6033. Several first steel wire ropes 6036 stacked in layers are connected between the clamping plates 6031 at the upper end of the mounting plate 601. One end of the first steel wire rope 6036 passes through the clamping plate 6031 and forms a brush structure. This brush structure contacts the fan-shaped plate 5. A fourth bolt 6034 passes through two sets of clamping plates 6031 and passes through the first steel wire rope 6036 located in the middle and is threaded to the fourth bolt 6034. In this embodiment, the radial sealing assembly 6 mainly passes through... The radial partition 9 achieves relative sealing on both sides through the rolling seal 607 and the first sealing brush 603. The rolling seal 607 achieves its sealing function through a plurality of radially arranged rotating wheels 6079. Compared with existing technologies, the rolling design reduces sliding friction with the sector plate 5, significantly extending the service life of the seal. Furthermore, the rotating wheels 6079 are rotatably connected to a plurality of rolling frames 6071, allowing for device maintenance by replacing a damaged rolling frame 6071, reducing maintenance time and costs. Additionally, the first sealing brush 603 further improves the sealing performance of the radial partition 9.

[0040] Please see Figure 7-9In one embodiment of the present invention, the axial sealing assembly 7 includes a second sealing brush 701, a brush handle 702, a third sealing brush 703, and a flexible steel sheet sealing brush 704. The second sealing brush 701 is fixedly connected to a radial partition 9 on one side of the rotation direction. The second sealing brush 701 forms a relative sealing effect through a brush structure formed by a second steel wire rope 7012. A brush handle 702 is fixedly connected to the other side of the radial partition 9. The upper end of the brush handle 702 is bent away from the radial partition 9 at a bending angle of 45°. A third sealing brush 703 is connected to one side of the brush handle 702 at the upper end of the bent portion. The sealing brush 703 is a brush structure formed by a third steel wire rope 7032. This brush structure forms an effective sealing structure through sliding friction with the inner wall of the outer sleeve 1, further improving the sealing performance of the device. A flexible steel sheet sealing brush 704 is fixedly connected to the other side of the brush handle 702 located at the upper end of the bend. The flexible steel sheet brush is a thin plate 7042 composed of stainless steel sheets that forms a sealing structure through sliding friction with the inner wall of the outer sleeve 1, further improving the relative sealing performance of the device and preventing leakage between flue gas and air. The second sealing brush 701 includes a first pressure plate 7011, a second steel wire rope 7012, a front bending pressure plate 7013, and a rear bending pressure plate 7014. 14. A first pressure cap 7011 is connected to a radial partition 9 located on one side of the rotation direction. A first mounting groove is provided on one side of the first pressure cap 7011. Several second steel wire ropes 7012 are stacked in layers in the first mounting groove. A backward bending pressure plate 7014 is connected to the opening of the first mounting groove. One side of the backward bending pressure plate 7014 abuts against the stacked second steel wire ropes 7012, and the other side of the backward bending pressure plate 7014 abuts against the radial partition 9. The upper end of the backward bending pressure plate 7014 passes through the first mounting groove and is bent towards the radial partition 9. One end of the second steel wire rope 7012 passes through the mounting groove and forms a brush structure. The structure contacts the inner wall of the outer sleeve 1. A front bending pressure plate 7013 is fixedly connected to one side of the edge of the first pressure plate 7011. The upper end of the front bending pressure plate 7013 is bent towards the side of the second steel wire rope 7012, and the bending angle is 10°. A first pad 7015 is provided on one side of the brush handle 702, and a second pad 7016 is provided on one side of the outer end of the first pressure plate 7011. The fifth bolt 7017 passes through the first pad 7015, the brush handle 702, the radial partition 9, the rear bending pressure plate 7014, the second steel wire rope 7012, the first pressure plate 7011 and the second pad 7016 in sequence, and is then threadedly connected to the fifth nut 7018.The third sealing brush 703 includes a second pressure cap 7031, a third steel wire rope 7032, and a pressing plate 7033. The second pressure cap 7031 is connected to one side of the upper end of the brush handle 702. A second mounting groove is formed on the second pressure cap 7031 facing the brush handle 702. Several third steel wire ropes 7032 are stacked in layers within the second mounting groove. The pressing plate 7033 is connected to the opening of the second mounting groove. One side of the pressing plate 7033 abuts against the stacked third steel wire ropes 7032, and the other side of the pressing plate 7033 abuts against the brush handle 702. One end of each third steel wire rope 7032 passes through the second mounting groove. A brush structure is formed, which contacts the inner wall of the outer sleeve 1; the flexible steel sheet sealing brush 704 includes a flat steel 7041, a thin plate 7042, and a third pressure plate 7043. The other side of the upper end of the brush handle 702 is fixed by the thin plate 7042 and the flat steel 7041 stacked in sequence. The outermost layer of this stacked structure always ends with the thin plate 7042, and the third pressure plate 7043 is connected to the outermost thin plate 7042. The flat steel 7041 extends from one side of the thin plate 7042 to form a multi-layer brush strip, which contacts the inner side of the outer sleeve 1; the sixth bolt 7044 passes through the second pressure cover 7031 in sequence. The stacked layers formed by the third wire rope 7032, extrusion plate 7033, thin plate 7042, and flat steel 7041, and the third pressure plate 7043 are threadedly connected to the sixth nut 7045; the first wire rope 6036 has two or more stacked layers, and the second wire rope 7012 and the third wire rope 7032 both have three or more stacked layers. The first wire rope 6036, the second wire rope 7012, and the third wire rope 7032 are all made of stainless steel; each group of thin plates 7042 consists of two or more layers of stainless steel sheets, and the number of groups of thin plates 7042 is one more than the number of groups of flat steel 7041. The assembly has three or more layers, with flat steel 7041 and thin plate 7042 arranged alternately. In this embodiment, the axial sealing assembly 7 achieves sealing performance through a second sealing brush 701, a third sealing brush 703, and a flexible steel sheet sealing brush 704. The second sealing brush 701 and the third sealing brush 703 achieve relative sealing through a brush structure formed by steel wire rope, while the flexible steel sheet sealing brush 704 achieves sealing through contact between a stainless steel sheet and the outer sleeve 1. In this embodiment, the modular design and multi-layer structure not only enhance sealing performance but also improve the durability and ease of maintenance of the assembly.

[0041] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0042] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A rotary regenerative air preheater gas-tight device, comprising a regenerative air preheater, characterized in that: The regenerative air preheater includes an outer sleeve (1), a central cylinder (2), a drive shaft (3), an annular plate (4), a sector plate (5), a radial sealing assembly (6), and an axial sealing assembly (7). The drive shaft (3) is connected to the middle of the central cylinder (2), and sealing rings (8) are fixedly connected to both ends of the central cylinder (2). Several radial partitions (9) are fixedly connected to the central cylinder (2) between the sealing rings (8). The radial partitions (9) are evenly spaced along the circumference of the central cylinder (2). The radial partitions (9) and the central cylinder (2) are rotatably connected inside the outer sleeve (1). A heat exchange unit is set in the space formed by the outer sleeve (1), the radial partitions (9), and the central cylinder (2). 10) An axial sealing assembly (7) is connected to the outer edge of the radial partition (9). The axial sealing assembly (7) is slidably connected to the inner wall of the outer sleeve (1). Radial sealing assemblies (6) are respectively provided on the upper and lower sides of the radial partition (9). One end of the radial sealing assembly (6) is connected to the outer periphery of the sealing ring (8). A ring sleeve plate (4) is rotatably connected to one side of the outer end of the sealing ring (8). The drive shaft (3) is rotatably connected to the middle of the ring sleeve plate (4). Several fan-shaped plates (5) are fixedly connected to the outer periphery of the ring sleeve plate (4). One side of the outer end of the fan-shaped plate (5) is fixedly connected to the inner wall of the outer sleeve (1). The radial sealing assembly (6) is slidably connected to the fan-shaped plate (5). The radial sealing assembly (6) includes a mounting plate (601) and a sealing plate (602). The mounting plate (601) is disposed on one side of the radial partition (9) along the rotation direction. A first sealing brush (603) is disposed at the upper end of the mounting plate (601). A sealing plate (602) is disposed on the other side of the radial partition (9). A buffer plate (604) is connected to one side of the sealing plate (602), and a fixing plate (605) is connected to one side of the buffer plate (604). 605) The upper end is rotatably connected to a movable plate (606), the upper end of the movable plate (606) is fixedly connected to a rolling seal (607), the lower end of the movable plate (606) is connected to a spring (608), the lower end of the spring (608) is fixedly connected to a support plate (609), one side of the support plate (609) is fixedly connected to a fixed plate (605), and a number of reinforcing ribs (610) are fixedly connected between the lower end face of the support plate (609) and the fixed plate (605). The outer side of the fixing plate (605) is provided with a plurality of first pressure plates (611), and the outer side of the mounting plate (601) is provided with a plurality of second pressure plates (612). The second pressure plates (612) are respectively corresponding to the first pressure plates (611). The first bolt (613) passes through the first pressure plate (611), the fixing plate (605), the buffer plate (604), the sealing plate (602), the radial partition (9), the mounting plate (601) and the second pressure plates (612) in sequence and is then threadedly connected to the first nut (614). The rolling seal (607) includes a rolling frame (6071), a fixed shaft (6072), a rotating bearing (6073), an isolation disc (6074), and a spring plate (6075). A plurality of evenly arranged rolling frames (6071) are connected to the upper end of the movable plate (606). A second bolt (6076) passes sequentially through the movable plate (606) and the rolling frames (6071) and is threadedly connected to a second nut (6077). A rotating groove (6078) is provided on the rolling frame (6071), and a fixed shaft (6072) is fixedly connected within the rotating groove (6078). A spring plate (6075) is fixedly connected to the fixed shaft (6072). A number of isolation discs (6074) are provided. Rotary bearings (6073) are connected to the fixed shafts (6072) on both sides of the isolation discs (6074). Rotary wheels (6079) are fixedly connected to the outer periphery of the rotary bearings (6073). The rotary wheels (6079) are rotatably connected to the fan-shaped plates (5). A spring plate (6075) is fixedly connected between two adjacent sets of rolling frames (6071) by screws (60710). The middle section of the spring plate (6075) is S-shaped corrugated, and the end section of the spring plate (6075) is a circular arc structure. The outer arc surface of the circular arc structure is slidably connected to the fan-shaped plates (5).

2. The airtight device for a rotary regenerative air preheater according to claim 1, characterized in that: The spring component (608) includes an upper rotating support (6081), a lower rotating support (6082), a telescopic rod (6083), and a helical spring (6084). The upper rotating support (6081) is fixedly connected to one side of the lower end of the movable plate (606), and the lower rotating support (6082) is fixedly connected to one side of the upper end of the support plate (609). The telescopic rod (6083) is fixedly connected between the upper rotating support (6081) and the lower rotating support (6082). The helical spring (6084) is sleeved on the telescopic rod (6083). One end of the helical spring (6084) abuts against the upper rotating support (6081), and the other end of the helical spring (6084) abuts against the lower rotating support (6082).

3. The airtight device for a rotary regenerative air preheater according to claim 1, characterized in that: The first sealing brush (603) includes a clamping plate (6031), a third bolt (6032), a third nut (6033), a fourth bolt (6034), a fourth nut (6035), and a first steel wire rope (6036). The upper edge of the mounting plate (601) is connected to the clamping plate (6031) on both sides. The third bolt (6032) passes through the clamping plate (6031) and the mounting plate (601) in sequence and is threaded into the third nut (6033). The mounting plate (601) is connected to the clamping plates (6031) at the upper end by a plurality of first steel wire ropes (6036) stacked in layers. One end of the first steel wire rope (6036) passes through the clamping plate (6031) and forms a brush structure. The brush structure contacts the fan-shaped plate (5). The fourth bolt (6034) passes through the two sets of clamping plates (6031) and passes through the first steel wire rope (6036) located in the middle and is threadedly connected to the fourth bolt (6034).

4. The airtight device for a rotary regenerative air preheater according to claim 3, characterized in that: The axial sealing assembly (7) includes a second sealing brush (701), a brush handle (702), a third sealing brush (703), and a flexible steel sheet sealing brush (704). The second sealing brush (701) is fixedly connected to the radial partition (9) on one side of the rotation direction, and the brush handle (702) is fixedly connected to the other side of the radial partition (9). The upper end of the brush handle (702) is bent away from the radial partition (9) at a bending angle of 45°. The third sealing brush (703) is connected to one side of the brush handle (702) at the upper end of the bent portion, and the flexible steel sheet sealing brush (704) is fixedly connected to the other side of the brush handle (702) at the upper end of the bent portion.

5. The airtight device for a rotary regenerative air preheater according to claim 4, characterized in that: The second sealing brush (701) includes a first pressure cap (7011), a second steel wire rope (7012), a front bending pressure plate (7013), and a rear bending pressure plate (7014). The first pressure cap (7011) is connected to the radial partition (9) located on one side of the rotation direction. A first mounting groove is provided on one side of the first pressure cap (7011). Several second steel wire ropes (7012) are stacked in layers in the first mounting groove. The rear bending pressure plate (7014) is connected to the opening of the first mounting groove. One side of the rear bending pressure plate (7014) is connected to the stacked second steel wire ropes (7012). 012) Abutting each other, the other side of the back bending pressure plate (7014) abuts against the radial partition (9), the upper end of the back bending pressure plate (7014) passes through the first mounting groove and then bends towards the radial partition (9), one end of the second steel wire rope (7012) passes through the mounting groove and forms a brush structure, the brush structure is in contact with the inner wall of the outer sleeve (1), a front bending pressure plate (7013) is fixedly connected to one side of the edge of the first pressure plate (7011), the upper end of the front bending pressure plate (7013) bends towards the side of the second steel wire rope (7012) with a bending angle of 10°; A first pad (7015) is provided on one side of the brush handle (702), and a second pad (7016) is provided on one side of the outer end of the first pressure cap (7011). The fifth bolt (7017) passes through the first pad (7015), brush handle (702), radial partition (9), back bend pressure plate (7014), second wire rope (7012), first pressure cap (7011) and second pad (7016) in sequence and is then threadedly connected to the fifth nut (7018).

6. The airtight device for a rotary regenerative air preheater according to claim 5, characterized in that: The third sealing brush (703) includes a second pressure cap (7031), a third steel wire rope (7032), and a pressing plate (7033). The upper end of the brush handle (702) is connected to the second pressure cap (7031). A second mounting groove is provided on the second pressure cap (7031) facing the brush handle (702). Several third steel wire ropes (7032) are stacked in layers in the second mounting groove. The opening of the second mounting groove is connected to the pressing plate (7033). One side of the pressing plate (7033) abuts against the stacked third steel wire ropes (7032), and the other side of the pressing plate (7033) abuts against the brush handle (702). One end of the third steel wire rope (7032) passes through the second mounting groove to form a brush structure. The brush structure is in contact with the inner wall of the outer sleeve (1).

7. The airtight device for a rotary regenerative air preheater according to claim 6, characterized in that: The flexible steel sheet sealing brush (704) includes a flat steel (7041), a thin plate (7042), and a third pressure plate (7043). The other side of the upper end of the brush handle (702) is fixed by the thin plate (7042) and the flat steel (7041) stacked in sequence. The outermost layer of the stacked structure always ends with the thin plate (7042), and the third pressure plate (7043) is connected to the outermost thin plate (7042). The flat steel (7041) extends out from one side of the thin plate (7042) to form a multi-layer brush strip, which contacts the inner side of the outer sleeve (1). The sixth bolt (7044) passes through the second pressure plate (7031), the third wire rope (7032), the extrusion plate (7033), the stacked layer formed by the thin plate (7042) and the flat steel (7041), the third pressure plate (7043), and is then threadedly connected to the sixth nut (7045).

8. The airtight device for a rotary regenerative air preheater according to claim 7, characterized in that: The first wire rope (6036) has two or more stacked layers, and the second wire rope (7012) and the third wire rope (7032) both have three or more stacked layers. The first wire rope (6036), the second wire rope (7012), and the third wire rope (7032) are all made of stainless steel. Each group of thin plates (7042) consists of two or more layers of stainless steel sheets. The number of groups of thin plates (7042) is one more than the number of groups of flat steel (7041). The number of groups of flat steel (7041) is three or more layers, and the flat steel (7041) and thin plates (7042) are arranged alternately.

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