CN115355375A

CN115355375A - Sealing and reinforcing structure at joint of metal chimney

Info

Publication number: CN115355375A
Application number: CN202210840387.6A
Authority: CN
Inventors: 韩召先; 李南吉; 王杰; 韩霜雪; 刘强
Original assignee: Qingdao Haoyu Environmental Technology Engineering Co ltd
Current assignee: Qingdao Haoyu Environmental Technology Engineering Co ltd
Priority date: 2022-07-18
Filing date: 2022-07-18
Publication date: 2022-11-18

Abstract

The invention discloses a sealing and reinforcing structure for a metal chimney joint, and mainly relates to the field of chimney connection. Including chimney upper segment and chimney hypomere, be equipped with the upper flange dish on the chimney upper segment, be equipped with down the flange dish on the chimney hypomere, be equipped with a plurality of fixing bolt between upper flange dish and the lower flange dish, the top of lower flange dish is equipped with the catching groove, be equipped with first heat insulating part between catching groove and the lower flange dish, the bottom of upper flange dish is equipped with the buckle that the cooperation catching groove was used, be equipped with the second heat insulating part between buckle and the upper flange dish, be equipped with the inner seal spare between the bottom of buckle and catching groove, the edge of lower flange dish is equipped with the cover plate, the inboard of cover plate is equipped with the outer seal spare, there is the buckle closure along vertical sliding connection on the upper flange dish, be equipped with a plurality of reinforcing bolt between cover plate and the buckle closure. The invention has the beneficial effects that: the structure intensity and the leakproofness that upper and lower segment chimney is connected can be guaranteed to it, and makes things convenient for outside seal assembly's change, guarantees the holistic exhaust fume efficiency of chimney.

Description

Sealing and reinforcing structure at joint of metal chimney

Technical Field

The invention relates to the field of metal chimneys, in particular to a sealing and reinforcing structure for a metal chimney joint.

Background

The existing chimney is various in types, a metal chimney can be used in some places, the heat resistance of the metal chimney is good, the strength is high, the corrosion resistance is high, the service life is long, the metal chimney can be set into multiple sections when being high, the chimney above the metal chimney can be lifted by a lifting device during installation and then installed on the chimney below the metal chimney, the structural strength and the sealing performance between the upper chimney and the lower chimney connecting positions are weak points of the whole chimney, the existing upper chimney and lower chimney connecting structure is easy to reduce the connecting strength and the sealing performance after being used for a long time, and the stability and the smoke exhaust efficiency of the chimney are influenced.

Disclosure of Invention

The invention aims to provide a sealing and reinforcing structure at the joint of a metal chimney, which can ensure the structural strength and the sealing property of the connection of an upper chimney and a lower chimney, is convenient for replacing an outer side sealing assembly and ensures the integral smoke exhaust efficiency of the chimney.

In order to achieve the purpose, the invention is realized by the following technical scheme:

the utility model provides a sealed reinforced structure of metal chimney junction, includes chimney upper segment and chimney hypomere, be equipped with the ring flange on the chimney upper segment, be equipped with down the ring flange on the chimney hypomere, be equipped with a plurality of fixing bolt between ring flange and the lower ring flange, the top of lower ring flange is equipped with the catching groove, be equipped with first heat insulating part between catching groove and the lower ring flange, the bottom of ring flange is equipped with the buckle that the cooperation catching groove used, be equipped with the second heat insulating part between buckle and the ring flange, be equipped with the inner seal piece between the bottom of buckle and catching groove, the inner seal piece is located fixing bolt's inboard, the edge of lower ring flange is equipped with the cover plate, the top of cover plate is higher than the top of ring flange, the inboard of cover plate is equipped with outer sealing member, outer sealing member overlaps the outside of establishing at ring flange and lower ring flange contact position, there is the buckle closure along vertical sliding connection on the ring flange, and the buckle closure bottom of cover lid contacts with outer sealing member top, and the buckle closure is used for fixing outer sealing member on the cover plate, be equipped with a plurality of reinforcing bolt between cover plate and the buckle.

Furthermore, the top of lower flange dish is equipped with the recess, the catching groove sets up in the recess, first heat-insulating part is located between catching groove lateral wall and the recess inside wall.

Furthermore, a convex plate is arranged at the bottom of the upper flange plate, the second heat insulation piece is positioned between the top of the pinch plate and the bottom of the convex plate, and the convex plate enters the groove when the upper flange plate is in contact with the lower flange plate.

Further, the first heat insulation piece and the second heat insulation piece are both of vacuum sandwich structures.

Furthermore, a ring plate is arranged at the bottom of the cover plate and fixed at the bottom of the lower flange plate, and the bottom of the outer sealing element is in contact with the top of the ring plate.

Furthermore, a plurality of ejector rods are connected to the ring plate in a sliding mode along the vertical direction, the ejector rods are in contact with the bottom of the outer sealing piece, and a plurality of reset springs are arranged between the ejector rods and the ring plate.

Furthermore, a plurality of adjusting screws are rotatably connected to the upper flange plate, the adjusting screws penetrate through the fastening cover and are in threaded connection with the fastening cover, and the fastening cover covers a gap between the upper flange plate and the outer sealing piece.

Furthermore, a plurality of fixing seats are arranged on the buckle cover, the reinforcing bolts penetrate through the side wall of the cover plate and then are in threaded connection with the fixing seats, a sleeve plate is arranged at the bottom of the upper section of the chimney, the sleeve plate is sleeved at the top of the lower section of the chimney, the upper flange plate is fixed on the outer side of the sleeve plate, and the bottom of the sleeve plate is in contact with the top of the lower flange plate.

Furthermore, a plurality of reinforcing ribs are arranged between the upper flange plate and the upper section of the chimney, a plurality of reinforcing ribs are also arranged between the lower flange plate and the lower section of the chimney, and the reinforcing ribs are positioned between the adjacent fixing bolts.

Further, the inner sealing piece and the outer sealing piece are made of heat-resistant rubber.

Compared with the prior art, the invention has the beneficial effects that:

1. the upper flange plate is arranged on the upper section of the chimney, the lower flange plate is arranged on the lower section of the chimney, the upper flange plate and the lower flange plate are fixed through the fixing bolt, the upper section of the chimney and the lower section of the chimney are connected and fixed, meanwhile, the bottom of the upper flange plate is provided with the buckle plate, the top of the lower flange plate is provided with the buckle groove, the buckle plate and the bottom of the buckle groove are provided with the inner sealing element, and the inner sealing element is positioned on the inner side of the fixing bolt;

2. the first heat insulation piece is arranged between the buckling groove and the lower flange plate, the second heat insulation piece is arranged between the buckling plate and the upper flange plate, and the inner sealing piece is positioned between the buckling plate and the bottom of the buckling groove, so that when the temperature of smoke is transmitted to the upper flange plate and the lower flange plate, the smoke is isolated by the first heat insulation piece and the second heat insulation piece, the temperature of the buckling plate and the buckling groove is reduced, the inner sealing piece between the buckling plate and the buckling groove is not in a high-temperature state for a long time, the service life and the sealing effect of the inner sealing piece are ensured, the long-time sealing effect can be kept, and frequent replacement is not needed;

3. the edge at the lower flange dish sets up the cover plate, the top of cover plate is higher than the top of last ring flange, the inboard of cover plate sets up the outer seal spare, the outer seal spare cover is established in the outside of last ring flange and lower flange contact position, utilize the outer seal spare to carry out further sealed to the edge contact position of last ring flange and lower flange dish, thereby further improve sealed effect, the buckle closure on the top utilization last ring flange of outer seal spare is fixed, thereby sliding the buckle closure after the sealed effect of outer seal spare reduces, conveniently expose the outer seal spare so that carry out the efficient change operation, set up a plurality of reinforcing bolts between cover plate and the buckle closure simultaneously, make the connection structure between last ring flange and the lower flange dish more firm, further improved the structural strength of chimney hookup location.

Drawings

FIG. 1 is a schematic perspective view of the present invention.

Fig. 2 is a right side view of the present invention.

Fig. 3 isbase:Sub>A cross-sectional view taken along linebase:Sub>A-base:Sub>A of fig. 2 of the present invention.

Fig. 4 is a cross-sectional view taken in the direction B-B of fig. 3 of the present invention.

Fig. 5 is a partially enlarged view of the portion C of fig. 3 according to the present invention.

Reference numerals shown in the drawings:

1. an upper section of a chimney; 2. a lower section of the chimney; 3. an upper flange plate; 4. a lower flange plate; 5. fixing the bolt; 6. buckling grooves; 7. a first thermal insulation member; 8. buckling the plate; 9. a second thermal insulation member; 10. an inner seal; 11. a cover plate; 12. an outer seal; 13. covering; 14. reinforcing the bolt; 15. a groove; 16. a convex plate; 17. a ring plate; 18. a top rod; 19. a return spring; 20. adjusting the screw rod; 21. a fixed seat; 22. sheathing; 23. and (7) reinforcing ribs.

Detailed Description

The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and these equivalents also fall within the scope of the present application.

The invention relates to a sealing and reinforcing structure for the joint of a metal chimney, which comprises a main body structure comprising an upper chimney section 1 and a lower chimney section 2, wherein the upper chimney section 1 and the lower chimney section 2 are respectively an upper part and a lower part of the chimney structure, the cross section of the upper chimney section 1 and the lower chimney section 2 is generally square or circular, the most common cross section is circular, the upper chimney section 1 is made of metal materials and is fixed at the top of the lower chimney section 2 during assembly, an upper flange 3 is welded on the upper chimney section 1, a lower flange 4 is welded on the lower chimney section 2, the flange is generally in an annular structure and is welded and fixed at the outer side of the chimney, bolt holes are arranged on the flange, a plurality of fixing bolts 5 are arranged between the upper flange 3 and the lower flange 4, the fixing bolts 5 pass through the bolt holes at the corresponding positions of the upper flange 3 and the lower flange 4 and then fix the upper flange 3 and the lower flange 4 together to realize the connection and fixation of the upper chimney section 1 and the lower chimney section 2, the top of the lower flange plate 4 is provided with a buckling groove 6, the buckling groove 6 is of a groove-shaped structure with an opening at the top, a first heat insulation piece 7 is arranged between the buckling groove 6 and the lower flange plate 4, because the temperature of smoke in the chimney is higher, the temperature of the side wall of the chimney is kept in a higher state for a long time, the heat is effectively prevented from being transmitted to the buckling groove 6 by the arrangement of the first heat insulation piece 7, the bottom of the upper flange plate 3 is provided with a buckling plate 8 matched with the buckling groove 6 for use, the buckling plate 8 enters the buckling groove 6 from the opening at the top, a second heat insulation piece 9 is arranged between the buckling plate 8 and the upper flange plate 3, the second heat insulation piece 9 is used for preventing the heat from being transmitted from the lower flange plate 3 to the buckling plate 8, an inner sealing piece 10 is arranged between the buckling plate 8 and the bottom of the buckling groove 6, and the inner sealing piece 10 seals the gap between the upper flange plate 3 and the lower flange plate 4 of the chimney, the smoke is prevented from overflowing from the gap, the sealing effect is guaranteed, under the condition that the temperatures of the pinch plate 8 and the pinch groove 6 are relatively low, the inner sealing element 10 between the pinch plate 8 and the pinch groove 6 can be used for a longer time compared with the existing structure, because the inner sealing element is arranged in the pinch groove 6 and positioned between the upper flange plate 3 and the lower flange plate 4, the connection part of the chimney needs to be completely disassembled during replacement, the replacement difficulty and cost are high, the later-period maintenance frequency of the chimney is reduced due to the longer service time, the sealing effect of the connection part of the chimney is guaranteed, and the maintenance cost is reduced;

the inner sealing element 10 is positioned on the inner side of the fixing bolt 5, the position of the fixing bolt 5 is easy to leak smoke, therefore, the smoke is sealed by the inner sealing element 10 before entering the position of the fixing bolt 5, the sealing effect is better, the edge of the lower flange plate 4 is provided with the cover plate 11, the top of the cover plate 11 is higher than the top of the upper flange plate 3, the cover plate 11 covers the upper flange plate 3 and the lower flange plate 4 along the vertical height, a gap is reserved between the edges of the upper flange plate and the lower flange plate 4, the inner side of the cover plate 11 is provided with the outer sealing element 12, the outer sealing element 12 is sleeved on the outer side of the contact position of the upper flange plate 3 and the lower flange plate 4, the outer sealing element 12 is arranged to further seal the contact position of the edges of the upper flange plate 3 and the lower flange plate 4, the sealing effect is further improved, the buckle cover 13 is connected to the upper flange plate 3 along the vertical sliding direction, the bottom of the buckle cover 13 contacts with the top of the outer sealing element 12, the buckle cover 13 is used for fixing the outer sealing element 12 on the cover plate 11, the outer sealing element 12 is fixed in the area between the cover plate 11 and the upper flange 3 and the lower flange 4, meanwhile, the buckle cover 13 can limit and fix the position of the outer sealing element 12, and the buckle cover 13 can slide relative to the upper flange 3, therefore, after the outer sealing element 12 is used in a long-time high-temperature state, if the sealing effect is poor, the buckle cover 12 can slide upwards to expose the outer sealing element 12, at this time, the outer sealing element 12 can be replaced without disassembling the upper flange 3 and the lower flange 4, the difficulty and the cost of replacement are greatly reduced, a plurality of reinforcing bolts 14 are arranged between the cover plate 11 and the buckle cover 13, the cover plate 11 and the buckle cover 13 are respectively arranged on the upper flange 3 and the lower flange 4, the cover plate 11 and the buckle cover 13 are fixed by the reinforcing bolts 14, so that the stability of the connecting structure between the upper flange plate 3 and the lower flange plate 4 can be further improved, and the integral structural strength of the chimney is improved.

Preferably, the top of lower flange 4 is equipped with recess 15, and recess 15 is by the inside sunken formation in top of lower flange 4, catching groove 6 sets up in recess 15, and catching groove 6 can use the channel-section steel preparation, welded connection between its outside and the recess 15 inside wall, first heat-insulating part 7 is located between catching groove 6 lateral wall and the recess 15 inside wall, and such setting makes most of catching groove 6 all be connected with recess 15's inside wall through first heat-insulating part 7, and consequently catching groove 6 is littleer with the area of contact of lower flange 4, and the heat of transmission still less, and the control effect to the temperature in the catching groove 6 is better, has improved the thermal-insulated effect of first heat-insulating part 7.

Preferably, the bottom welding of last ring flange 3 or integrated into one piece is fixed with flange 16, second heat insulating part 9 is located between 8 tops of buckle and the 16 bottoms of flange, flange 16 gets into the inside of recess 15 when going up ring flange 3 and lower ring flange 4 contact, and the setting of flange 16 can provide the support for setting up of second heat insulating part 9, and flange 16 gets into the inseparabler that makes the contact position laminating of last ring flange 3 and lower ring flange 4 in recess 15 when going up ring flange 3 and lower ring flange 4 contact simultaneously, and the contact between buckle 8 on the flange 16 and the catching groove 6 in the recess 15 is more firm, makes the inner seal 10's between buckle 8 and the catching groove 6 structure more firm, guarantees sufficient sealed effect.

Preferably, first heat insulating part 7 and second heat insulating part 9 are vacuum sandwich structure, concrete bottom at flange 16 sets up the intermediate layer, evacuation setting in the intermediate layer, the majority of contact position between buckle 8 and flange 16 is sandwich structure, vacuum sandwich's thermal-insulated effectual, further reduced buckle 8's temperature, the same also sets up the intermediate layer between recess 15 inside wall and catching groove 6 lateral wall, evacuation in the intermediate layer, make the part of sending out of contact position between catching groove 6 lateral wall and the recess 15 lateral wall be vacuum sandwich structure, heat transfer efficiency is lower, guaranteed that the temperature in catching groove 6 is far less than recess 15, make the thermal-insulated effect better to sealing member 10, its temperature can stably maintain at lower level compared in prior art's structure.

Preferably, the bottom of the cover plate 11 is fixed with a ring plate 17 through welding or integral casting, the ring plate 17 is fixed at the bottom of the lower flange plate 4 through welding or bolts, the bottom of the outer sealing member 12 is in contact with the top of the ring plate 17, the cover plate 11 is fixed on the lower flange plate 4 through the ring plate 17 due to the arrangement, a fixing area which is more effective for the outer sealing member 12 is formed by the ring plate 17 and the cover plate 11, the position of the outer sealing member 12 is not easy to misplace or shake relatively, and the sealing effect of the contact gap position between the upper flange plate 3 and the lower flange plate 4 is improved.

Preferably, a plurality of ejector rods 18 are connected to the ring plate 17 in a sliding manner along the vertical direction, the ejector rods 18 penetrate through the ring plate 17 and then contact with the bottom of the outer sealing element 12, a plurality of return springs 19 are arranged between the ejector rods 18 and the ring plate 17, the specific return springs 19 are sleeved on the outer sides of the ejector rods 18, when the outer sealing element 12 is installed, the ejector rods 18 at the bottom are extruded to slide downwards, the return springs 19 are stretched, then the top of the outer sealing element 12 is fixed by using the buckle cover 13, and when the outer sealing element 12 needs to be replaced, the buckle cover 13 is opened, the outer sealing element 12 can be ejected out by one end distance under the elastic force action of the return springs 19 at the bottom, so that the outer sealing element 12 is conveniently operated, the replacement step of the outer sealing element 12 is further simplified, the convenience in air maintenance operation is improved, and the difficulty and the time in operation are reduced.

Preferably, a plurality of adjusting screws 20 are rotatably connected to the upper flange 3 through bearings, the adjusting screws 20 penetrate through the fastening cover 13 and are in threaded connection with the fastening cover 13, the fastening cover 13 covers a gap between the upper flange 3 and the outer seal 12, when the outer seal 12 is fixed and opened by using the fastening cover 13, the fastening cover 13 can be driven to slide up and down only by rotating the adjusting screws 20, so as to realize the sealing or exposure of the outer seal 12, and meanwhile, the fastening cover 13 covers the contact gap between the flange 3 and the outer seal 12, so as to form effective sealing of the gap between the outer seal 12 and the flange 3, further avoid the smoke from overflowing from the gap, and further improve the sealing effect.

Preferably, the buckle cover 13 is welded or bolted and is provided with a plurality of fixing seats 21, the reinforcing bolt 14 runs through behind the lateral wall of the cover plate 11 and is in threaded connection with the fixing seats 21, simultaneously, the cooperation of a plurality of reinforcing bolts 14 and the fixing seats 21 is utilized, so that the buckle cover 13 is more firmly fixed with the cover plate 11, the stability of the connecting structure between the upper flange plate 3 and the lower flange plate 4 is improved, and the disassembly and the installation operation of the buckle cover 13 are more convenient, the bottom welding or the integrated pouring of the upper chimney section 1 is fixed with the sleeve plate 22, the outer diameter of the sleeve plate 22 is larger than that of the lower chimney section 2, the sleeve plate 22 is sleeved on the top of the lower chimney section 2, so that the connecting gap between the upper chimney section 1 and the lower chimney section 2 is staggered, the overflow of flue gas is not facilitated, the sealing effect of the junction is improved, the outer side of the upper flange plate 3 welding or the integrated pouring is fixed on the sleeve plate 22, the bottom of the sleeve plate 22 is in contact with the top of the lower flange plate 4, so that the gap between the upper section 1 and the lower chimney section 2 is converted into the contact of the upper flange plate 3 and the lower flange plate 4, and the subsequent sealing operation is convenient.

Preferably, be equipped with a plurality of strengthening ribs 23 between upper flange 3 and the chimney upper segment 1, specific strengthening rib 23 can be triangle-shaped, and its two minor faces weld or integrative the pouring fixed with upper flange 3 and chimney upper segment 1 respectively, also be equipped with a plurality of strengthening ribs 23 between lower flange 4 and the chimney hypomere 2, strengthening rib 23 can be triangle-shaped, and its two minor faces weld or integrative the pouring fixed with lower flange 4 and chimney hypomere 2 respectively, and the setting of strengthening rib 23 can improve the fastness of structure between flange and the chimney, further improves the holistic structural strength of chimney, strengthening rib 23 is located between the adjacent fixing bolt 5, has made things convenient for fixing bolt 5's installation.

Preferably, the inner sealing member 10 and the outer sealing member 12 are made of heat-resistant rubber, which has high heat resistance, long service life and better sealing effect.

The working principle is as follows: according to the invention, the upper flange plate 3 is arranged on the upper section 1 of the chimney, the lower flange plate 4 is arranged on the lower section 2 of the chimney, the upper flange plate 3 and the lower flange plate 4 are fixed through the fixing bolt 5, so that the connection and fixation between the upper section 1 of the chimney and the lower section 2 of the chimney are realized, meanwhile, the buckle plate 8 is arranged at the bottom of the upper flange plate 3, the buckle groove 6 is arranged at the top of the lower flange plate 4, the inner sealing element 10 is arranged between the buckle plate 8 and the bottom of the buckle groove 6, and the inner sealing element 10 is positioned at the inner side of the fixing bolt 5; a first heat insulation piece 7 is arranged between the buckle groove 6 and the lower flange plate 4, a second heat insulation piece 9 is arranged between the buckle plate 8 and the upper flange plate 3, and an inner sealing piece 10 is arranged between the buckle plate 8 and the bottom of the buckle groove 6, so that when the temperature of smoke is transmitted to the upper flange plate 3 and the lower flange plate 4, the smoke is isolated by the first heat insulation piece 7 and the second heat insulation piece 9, the temperature of the buckle plate 8 and the buckle groove 6 is reduced, the inner sealing piece 10 between the buckle plate 8 and the buckle groove 6 cannot be in a high-temperature state for a long time, the service life and the sealing effect of the inner sealing piece 10 are ensured, the long-time sealing effect can be kept, and frequent replacement is not needed; the edge of the lower flange plate 4 is provided with a cover plate 11, the top of the cover plate 11 is higher than the top of the upper flange plate 3, the inner side of the cover plate 11 is provided with an outer sealing member 12, the outer sealing member 12 is sleeved on the outer side of the contact position of the upper flange plate 3 and the lower flange plate 4, the edge contact position of the upper flange plate 3 and the lower flange plate 4 is further sealed by the outer sealing member 12, so that the sealing effect is further improved, the top of the outer sealing member 12 is further fixed by a buckle cover 13 of the upper flange plate 3, the buckle cover 13 slides upwards after the sealing effect of the outer sealing member 12 is reduced, the outer sealing member 12 is conveniently exposed so as to be efficiently replaced, and meanwhile, a plurality of reinforcing bolts 14 are arranged between the cover plate 11 and the buckle cover 13, so that the connection structure between the upper flange plate 3 and the lower flange plate 4 is more stable, and the structural strength of the chimney connection position is further improved.

Claims

1. The utility model provides a sealed reinforced structure of metal chimney junction, includes chimney upper segment (1) and chimney hypomere (2), be equipped with upper flange dish (3) on chimney upper segment (1), be equipped with lower flange dish (4) on chimney hypomere (2), be equipped with a plurality of fixing bolt (5), its characterized in that between upper flange dish (3) and lower flange dish (4): the top of lower flange dish (4) is equipped with catching groove (6), be equipped with first heat insulating part (7) between catching groove (6) and lower flange dish (4), the bottom of going up ring flange (3) is equipped with buckle (8) that cooperation catching groove (6) used, be equipped with second heat insulating part (9) between buckle (8) and last ring flange (3), be equipped with interior sealing member (10) between the bottom of buckle (8) and catching groove (6), interior sealing member (10) are located the inboard of fixing bolt (5), the edge of lower flange dish (4) is equipped with cover plate (11), the top of cover plate (11) is higher than the top of last ring flange (3), the inboard of cover plate (11) is equipped with outer sealing member (12), outer sealing member (12) cover is established in the outside of last ring flange (3) and lower flange dish (4) contact position, upward have along vertical sliding connection buckle lid (13) on ring flange (3), buckle lid (13) bottom and outer sealing member (12) contact, the top is used for fastening bolt (11) and consolidates between cover plate (11) and cover plate (11), be equipped with a plurality of fastening bolt (11).

2. The sealing and reinforcing structure for the joint of the metal chimney according to claim 1, wherein: the top of lower flange dish (4) is equipped with recess (15), catching groove (6) set up in recess (15), first heat insulating part (7) are located between catching groove (6) lateral wall and recess (15) inside wall.

3. The sealing and reinforcing structure for the joint of the metal chimney according to claim 2, characterized in that: the bottom of the upper flange plate (3) is provided with a convex plate (16), the second heat insulation piece (9) is positioned between the top of the buckle plate (8) and the bottom of the convex plate (16), and the convex plate (16) enters the groove (15) when the upper flange plate (3) is contacted with the lower flange plate (4).

4. A sealing and reinforcing structure for a metal chimney joint, according to claim 3, characterized in that: the first heat insulation piece (7) and the second heat insulation piece (9) are both in a vacuum sandwich structure.

5. The sealing and reinforcing structure for the joint of the metal chimney according to claim 1, wherein: the bottom of the cover plate (11) is provided with a ring plate (17), the ring plate (17) is fixed at the bottom of the lower flange plate (4), and the bottom of the outer sealing element (12) is in contact with the top of the ring plate (17).

6. The sealing and reinforcing structure for the joint of the metal chimney according to claim 5, wherein: the ring plate (17) is connected with a plurality of ejector rods (18) in a sliding mode along the vertical direction, the ejector rods (18) are in contact with the bottom of the outer sealing piece (12), and a plurality of reset springs (19) are arranged between the ejector rods (18) and the ring plate (17).

7. The sealing and reinforcing structure for the joint of the metal chimney according to claim 1, wherein: the upper flange plate (3) is connected with a plurality of adjusting screws (20) in a rotating mode, the adjusting screws (20) penetrate through the buckling cover (13) and are in threaded connection with the buckling cover, and the buckling cover (13) covers a gap between the upper flange plate (3) and the outer sealing piece (12).

8. The sealing and reinforcing structure for the joint of the metal chimney according to claim 1, wherein: be equipped with a plurality of fixing bases (21) on buckle closure (13), reinforcing bolt (14) run through behind the lateral wall of cover plate (11) with fixing base (21) threaded connection, the bottom of chimney upper segment (1) is equipped with lagging (22), the top at chimney hypomere (2) is established in lagging (22) cover, go up the outside at lagging (22) in ring flange (3), the bottom of lagging (22) and the top contact of lower ring flange (4).

9. The sealing and reinforcing structure for the joint of the metal chimney according to claim 1, characterized in that: a plurality of reinforcing ribs (23) are arranged between the upper flange plate (3) and the upper section (1) of the chimney, a plurality of reinforcing ribs (23) are also arranged between the lower flange plate (4) and the lower section (2) of the chimney, and the reinforcing ribs (23) are located between the adjacent fixing bolts (5).

10. The sealing and reinforcing structure for the joint of the metal chimney according to claim 1, wherein: the inner sealing piece (10) and the outer sealing piece (12) are both made of heat-resistant rubber.