High-temperature flange connecting structure

Abstract

The utility model relates to the technical field of high-temperature flange connection, in particular to a high-temperature flange connection structure which comprises two middle protective shells. A sealing assembly is arranged between the two middle protection shells, a first side plate and a second side plate are installed on the side curved surfaces of the two middle protection shells correspondingly, and fixing nuts are welded to the positions, located at openings of the first through holes, of the side face of the second side plate correspondingly. The threaded end of the screw rod penetrates through first through holes formed in the first side plate and the second side plate and then is arranged in the corresponding fixing nuts in a penetrating mode, the screw rod and the fixing nuts fasten the first side plate and the second side plate, the inner hexagon screw head is sleeved with the rotating fluted disc, and the screw rod is prevented from being loosened from the fixing nuts when rotating. The effect of sealing connection of the high-temperature flange is achieved through cooperation, the situation that the sealing effect is affected due to bolt loosening in the flange using process is prevented, and the connection firmness degree is effectively improved compared with a traditional flange.

Description

Technical Field

[0001] The utility model relates to the technical field of high-temperature flange connection, in particular to a high-temperature flange connection structure. Background Technique

[0002] A flange is a pipeline connection component, which is widely used in the petrochemical industry due to its advantages of easy disassembly and assembly. Since the chemical industry mostly uses pipelines to transport flammable, explosive, corrosive or toxic substances, and has a certain pressure and temperature during transportation, it is required that the flange has certain corrosion resistance, high pressure resistance and good sealing performance to ensure the normal transportation of substances.

[0003] In the existing flange connection sealing structure, generally bolts bear the tensile load, and a sealing gasket is arranged between the flanges. The two flanges squeeze the sealing gasket to achieve the effect of sealed connection. However, during the use of the existing flange, factors such as vibration will cause the bolts to loosen. When the bolts loosen, the extrusion sealing effect on the sealing gasket between the two flanges will be affected, which will lead to a reduction in the sealing effect of the flange and easily cause the leakage of the transported substances. The leakage of substances is likely to endanger people's safety and the environment. Therefore, a high-temperature flange connection structure is proposed for the above problems. Summary of the Utility Model

[0004] In order to make up for the deficiencies of the prior art and solve the problems existing in the prior art, the utility model proposes a high-temperature flange connection structure.

[0005] The technical solution adopted by the utility model to solve its technical problems is as follows: A high-temperature flange connection structure described in the utility model includes two middle protective shells; a sealing component is arranged between the two middle protective shells, and a first side plate and a second side plate are respectively installed on the side curved surfaces of the two middle protective shells;

[0006] A number of first through holes are uniformly distributed and penetrated through the side surfaces of the first side plate and the second side plate, and fixing nuts are respectively welded at the openings of the first through holes on the side surface of the second side plate;

[0007] Screws are respectively penetrated through the first through holes opened on the side surface of the first side plate, and the threaded ends of the screws penetrate through the first through holes opened on the first side plate and the second side plate and then penetrate through the corresponding fixing nuts. Inner hexagonal screw heads are respectively installed on the side surfaces of the first side plate where the screws are located. A number of elastic limiting components are rotatably installed on the side curved surface of the first side plate corresponding to the inner hexagonal screw heads in a uniformly distributed manner, which cooperates to achieve the effect of sealed connection of the high-temperature flange, prevent the bolts from loosening during the use of the flange and affecting the sealing effect, and effectively improve the connection firmness compared with the traditional flange.

[0008] Preferably, fourth fitting grooves are respectively formed in the opposite sides of the first side plate and the second side plate, and second sealing gaskets are respectively arranged in the two fourth fitting grooves. The first through hole penetrates through the side surfaces of the two second sealing gaskets at the same time, so as to improve the sealing effect and ensure the normal use of the flange.

[0009] Preferably, the elastic limiting component includes a fixed shaft. The two ends of the fixed shaft are installed on the side curved surface of the first side plate through vertical plates. A rotating sleeve is rotatably sleeved on the fixed shaft. A scroll spring is arranged between the fixed shaft and the rotating sleeve. An L-shaped connecting plate is installed on the fixed shaft. The other end of the L-shaped connecting plate is provided with a fixed ring on the side surface of the first side plate. A rotating ring is rotatably installed in the fixed ring. A rotating gear disc is installed on the side surface of the rotating ring facing the inner hexagonal screw head. An inner hexagonal groove is formed through the side surface of the rotating gear disc, and the rotating gear disc can be sleeved outside the inner hexagonal screw head through the inner hexagonal groove, so as to twist the rotating gear disc, so that the rotating gear disc can be sleeved on the inner hexagonal screw head through the inner hexagonal groove, preventing the screw rod from rotating and the fixing nut from loosening, resulting in flange leakage.

[0010] Preferably, the two acting ends of the scroll spring are respectively fixed on the inner curved surface of the rotating sleeve and the side curved surface of the fixed shaft. The horizontal section of the L-shaped connecting plate is installed on the fixed shaft, and the vertical end of the L-shaped connecting plate is arranged on the side surface of the first side plate, so as to twist the rotating sleeve, so as to twist the rotating gear disc through the L-shaped connecting plate.

[0011] Preferably, a second through hole is formed through the horizontal section of the L-shaped connecting plate. A connecting rod is arranged through the second through hole, and the connecting rod is parallel to the vertical end of the L-shaped connecting plate. An arc-shaped tooth plate is installed at the end of the connecting rod facing the rotating gear disc, and the teeth of the arc-shaped tooth plate are located on the inner side of its arc. The teeth of the arc-shaped tooth plate are engaged with the teeth on the side surface of the rotating gear disc. A compression spring is sleeved on the connecting rod, and the compression spring is located between the horizontal section of the L-shaped connecting plate and the arc-shaped tooth plate. A pull buckle is installed at the other end of the connecting rod on the horizontal section of the L-shaped connecting plate, so as to engage the arc-shaped tooth plate with the rotating gear disc and prevent the rotating gear disc from rotating.

[0012] Preferably, the sealing component includes two first fitting grooves. The two first fitting grooves are formed in the inner sides of the two middle protective shells, and first sealing gaskets are respectively installed in the two first fitting grooves. Tooth grooves engaged with each other are respectively arranged on the opposite side surfaces of the two first sealing gaskets. Connecting ports are respectively installed on the opposite side surfaces of the two middle protective shells. A hole communicating with the connecting port is formed through the side surface of the first sealing gasket, so as to achieve the sealing effect and ensure the sealing effect of the flange.

[0013] Preferably, second fitting grooves and third fitting grooves are respectively formed on opposite sides of the two middle protective cases. A first U-shaped sealing ring and a second U-shaped sealing ring are respectively installed in the second fitting groove and the third fitting groove. A first pressing ring and a second pressing ring are respectively installed on opposite sides of the two middle protective cases, and the end portions of the first pressing ring and the second pressing ring are respectively fitted into the clamping grooves of the first U-shaped sealing ring and the second U-shaped sealing ring. The first pressing ring is located outside the second pressing ring, and the second pressing ring is located outside the opening of the first fitting groove, achieving the effect of multiple seals for the flange and improving the sealing effect of the flange.

[0014] The beneficial effects of the present utility model are as follows:

[0015] 1. The present utility model fastens the first side plate and the second side plate through the screw and the fixing nut. After the first side plate and the second side plate are fastened, the sealing assembly between the two middle protective cases is squeezed by the two middle protective cases. The rotating gear disk is sleeved on the head of the hexagon socket screw to prevent the screw from rotating and loosening from the fixing nut, achieving the effect of sealing connection for the high-temperature flange, preventing the bolts from loosening during the use of the flange and affecting the sealing effect, and effectively improving the connection firmness compared with the traditional flange.

[0016] 2. The present utility model seals by meshing the inner tooth grooves of the two first sealing gaskets, and achieves triple seals through the first pressing ring and the second pressing ring. The two second sealing gaskets will also squeeze and seal each other for quadruple seals, achieving the effect of flange sealing, effectively improving the sealing effect of the flange, and ensuring the normal connection and use of the flange. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 is the first three-dimensional structure diagram;

[0019] Figure 2 is the enlarged schematic diagram of the main structure of the screw fastening;

[0020] Figure 3 is the enlarged schematic diagram of the cross-section of the main structure of the flange assembly;

[0021] Figure 4 is the enlarged schematic diagram of area A in the cross-sectional view of the main structure of the flange assembly;

[0022] Figure 5It is a sectional enlarged schematic view of the main structure for connecting the first side plate and the second side plate;

[0023] Figure 6 It is a sectional enlarged schematic view of the main structure of the elastic limit component;

[0024] Figure 7 It is an enlarged schematic view of area B in the sectional view of the main structure of the elastic limit component;

[0025] Figure 8 It is a sectional enlarged schematic view of the main structure for installing the rotating gear disk.

[0026] In the figure: 1, middle protective shell; 2, first fitting groove; 3, first sealing gasket; 4, second fitting groove; 5, third fitting groove; 6, first U-shaped sealing ring; 7, second U-shaped sealing ring; 8, first extrusion ring; 9, second extrusion ring; 10, first side plate; 11, second side plate; 12, fourth fitting groove; 13, second sealing gasket; 14, first through hole; 15, fixing nut; 16, screw rod; 17, inner hexagon screw head; 18, fixing shaft; 19, rotating sleeve; 20, scroll spring; 21, L-shaped connecting plate; 22, second through hole; 23, fixing ring; 24, rotating ring; 25, rotating gear disk; 26, inner hexagon groove; 27, connecting rod; 28, arc-shaped tooth plate; 29, extrusion spring; 30, buckle; 31, connection port; 32, vertical plate. Specific embodiments

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0028] Please refer to Figure 1-8 As shown, a high-temperature flange connection structure includes two middle protective shells 1; a sealing component is arranged between the two middle protective shells 1, and a first side plate 10 and a second side plate 11 are respectively installed on the side curved surfaces of the two middle protective shells 1;

[0029] The side surfaces of the first side plate 10 and the second side plate 11 are uniformly and penetratingly provided with first through holes 14, and fixing nuts 15 are respectively welded at the openings of the first through holes 14 on the side surface of the second side plate 11;

[0030] A screw rod 16 is respectively penetrated and arranged in a first through hole 14 opened on the side surface of the first side plate 10, and the threaded end of the screw rod 16 penetrates through the first side plate 10 and the first through hole 14 opened on the second side plate 11 and then is penetrated and arranged in a corresponding fixing nut 15. Inner hexagon screw heads 17 are respectively installed on the side surface of the first side plate 10 where the screw rod 16 is located. A plurality of groups of elastic limiting components are evenly distributed and rotatably installed on the side curved surface of the first side plate 10 corresponding to the inner hexagon screw heads 17.

[0031] Fourth fitting grooves 12 are respectively opened on the opposite side surfaces of the first side plate 10 and the second side plate 11, and second sealing gaskets 13 are respectively arranged in the two fourth fitting grooves 12. The first through hole 14 penetrates through the side surfaces of the two second sealing gaskets 13 at the same time.

[0032] The elastic limiting component includes a fixed shaft 18. Both ends of the fixed shaft 18 are installed on the side curved surface of the first side plate 10 through vertical plates 32. A rotating sleeve 19 is rotatably sleeved on the fixed shaft 18. A scroll spring 20 is arranged between the fixed shaft 18 and the rotating sleeve 19. An L-shaped connecting plate 21 is installed on the fixed shaft 18. The other end of the L-shaped connecting plate 21 is installed with a fixed ring 23 on the side surface of the first side plate 10. A rotating ring 24 is rotatably installed in the fixed ring 23. A rotating gear disc 25 is installed on the side surface of the rotating ring 24 facing the inner hexagon screw head 17. An inner hexagon groove 26 is penetrated and opened on the side surface of the rotating gear disc 25, and the rotating gear disc 25 can be sleeved on the outer side of the inner hexagon screw head 17 through the inner hexagon groove 26.

[0033] The two acting ends of the scroll spring 20 are respectively fixed on the inner curved surface of the rotating sleeve 19 and the side curved surface of the fixed shaft 18. The horizontal section of the L-shaped connecting plate 21 is installed on the fixed shaft 18, and the vertical section of the L-shaped connecting plate 21 is arranged on the side surface of the first side plate 10.

[0034] A second through hole 22 is penetrated and opened on the horizontal section of the L-shaped connecting plate 21. A connecting rod 27 is penetrated and arranged in the second through hole 22, and the connecting rod 27 is parallel to the vertical end of the L-shaped connecting plate 21. An arc-shaped tooth plate 28 is installed at the end of the connecting rod 27 facing the rotating gear disc 25, and the teeth of the arc-shaped tooth plate 28 are located on the inner side of its arc. The teeth of the arc-shaped tooth plate 28 are engaged with the teeth on the side surface of the rotating gear disc 25. A compression spring 29 is sleeved on the connecting rod 27, and the compression spring 29 is located between the horizontal section of the L-shaped connecting plate 21 and the arc-shaped tooth plate 28. The other end of the connecting rod 27 is installed with a pull buckle 30 on the horizontal section of the L-shaped connecting plate 21.

[0035] During operation, since the existing flange will be affected by factors such as vibration during use, resulting in bolt loosening, when the bolts are loosened, the extrusion sealing effect on the sealing gasket between the two flanges will be affected, which will in turn reduce the sealing effect of the flange and easily cause leakage of the conveyed substance. The leakage of the substance is likely to pose a hazard to people's safety and the environment. In this solution, in the initial state, the scroll spring 20 will always twist and rotate the rotating sleeve 19, so that the rotating sleeve 19 drives the vertical section of the L-shaped connecting plate 21 and the rotating gear disc 25 installed at the end of the L-shaped connecting plate 21 to be arranged on the outer side of the first side plate 10, so that the rotating gear disc 25 is sleeved outside the hexagon socket head 17 through the hexagon socket 26 opened on its side, thereby performing rotational limit on the hexagon socket head 17 to prevent the screw rod 16 from rotating and loosening in the fixed nut 15. In the initial state, the compression spring 29 will always push down the arc-shaped gear plate 28, so that the arc-shaped gear plate 28 meshes with the rotating gear disc 25 downward to fix the rotating gear disc 25 and prevent the rotating gear disc 25 from being driven by the hexagon socket head 17 to rotate. During use, by aligning the first through hole 14 opened on the first side plate 10 with the second side plate 11, the L-shaped connecting plate 21 is flipped to the outside of the first side plate 10, so that the rotating gear disc 25 swings to the outside of the first side plate 10 with the fixed shaft 18 as the axis. The threaded end of the screw rod 16 passes through the first through hole 14 from one side of the first side plate 10 and is arranged in the fixed nut 15. The first side plate 10 and the second side plate 11 are fastened by the screw rod 16 and the fixed nut 15. When the first side plate 10 and the second side plate 11 are fastened, the sealing component between the two middle protective shells 1 is squeezed by the two middle protective shells 1 to achieve the sealing effect. Subsequently, the pull buckle 30 is pulled, so that the pull buckle 30 drives the arc-shaped gear plate 28 to move towards the horizontal section of the L-shaped connecting plate 27 through the connecting rod 27, so that the arc-shaped gear plate 28 is separated from the rotating gear disc 25. Subsequently, the rotating gear disc 25 is rotated so that the hexagon socket 26 corresponds to the corner of the hexagon socket head 17, and then the rotating gear disc 25 is sleeved on the hexagon socket head 17. The pull buckle 30 is released, so that the arc-shaped gear plate 28 meshes with the rotating gear disc 25 again, thereby performing rotational limit on the hexagon socket head 17 to prevent the screw rod 16 from rotating and loosening from the fixed nut 15, so as to ensure the connection and sealing effect of the two middle protective shells 1 and the first side plate 10 and the second side plate 11, and cooperate to achieve the function of high-temperature flange sealing connection, prevent the bolt loosening during the use of the flange from affecting the sealing effect, and effectively improve the connection firmness compared with the traditional flange.

[0036] Please refer to Figure 1-5 As shown, the sealing component includes two first fitting grooves 2. The two first fitting grooves 2 are opened on the inner sides of the two middle protective shells 1, and first gaskets 3 are respectively installed in the two first fitting grooves 2. Tooth grooves that mesh with each other are respectively arranged on the opposite sides of the two first gaskets 3. Connecting ports 31 are respectively installed on the opposite sides of the two middle protective shells 1. A hole communicating with the connecting port 31 is penetrated and opened on the side of the first gasket 3.

[0037] Two opposite sides of the two middle protective shells 1 are respectively provided with a second fitting groove 4 and a third fitting groove 5. A first U-shaped sealing ring 6 and a second U-shaped sealing ring 7 are respectively installed in the second fitting groove 4 and the third fitting groove 5. A first pressing ring 8 and a second pressing ring 9 are respectively installed on two opposite sides of the two middle protective shells 1, and the end parts of the first pressing ring 8 and the second pressing ring 9 are respectively fitted in the clamping grooves of the first U-shaped sealing ring 6 and the second U-shaped sealing ring 7. The first pressing ring 8 is located outside the second pressing ring 9, and the second pressing ring 9 is located outside the opening of the first fitting groove 2.

[0038] During operation, to ensure the sealing effect of the flange connection in this solution, improve the flange sealing performance, and prevent leakage during the use of the flange, in this solution, when the two middle protective shells 1 are fitted together, the first sealing gaskets 3 between the two middle protective shells 1 will be in contact with each other, and the end parts of the first pressing ring 8 and the second pressing ring 9 respectively installed on the inner sides of the two middle protective shells 1 will be respectively fitted and sealed in the first U-shaped sealing ring 6 and the second U-shaped sealing ring 7. And when the first side plate 10 and the second side plate 11 are in contact with each other, the two second sealing gaskets 13 on their inner sides will be in contact with each other, and are tightly connected by the screw 16 and the fixing nut 15, so that the two first sealing gaskets 3 are meshed and sealed through the tooth grooves on their inner sides, and triple sealing is achieved through the first pressing ring 8 and the second pressing ring 9, and the two second sealing gaskets 13 will be mutually pressed and sealed to achieve quadruple sealing, which cooperatively plays the role of flange sealing, effectively improves the sealing effect of the flange, and ensures the normal connection and use of the flange.

[0039] Working principle: In the initial state, the volute spring 20 will always twist and rotate the rotating sleeve 19, causing the rotating sleeve 19 to drive the vertical section of the L-shaped connecting plate 21 and the rotating gear disk 25 installed at the end of the L-shaped connecting plate 21 to be arranged on the outer side of the first side plate 10, so that the rotating gear disk 25 is sleeved outside the inner hexagonal screw head 17 through the inner hexagonal groove 26 opened on its side, thereby restricting the rotation of the inner hexagonal screw head 17 and preventing the screw rod 16 from rotating and loosening in the fixed nut 15. In the initial state, the compression spring 29 will always push down the arc-shaped gear plate 28, causing the arc-shaped gear plate 28 to mesh with the rotating gear disk 25 downward to fix the rotating gear disk 25 and prevent the rotating gear disk 25 from being driven by the inner hexagonal screw head 17 to rotate. During use, by aligning the first through hole 14 opened on the first side plate 10 with the second side plate 11, the L-shaped connecting plate 21 is flipped to the outside of the first side plate 10, causing the rotating gear disk 25 to swing to the outside of the first side plate 10 with the fixed shaft 18 as the axis. The threaded end of the screw rod 16 is passed through the first through hole 14 from one side of the first side plate 10 and then arranged in the fixed nut 15. The first side plate 10 and the second side plate 11 are fastened by the screw rod 16 and the fixed nut 15. When the first side plate 10 and the second side plate 11 are fastened, the sealing component between the two middle protective shells 1 is squeezed by the two middle protective shells 1 to achieve the sealing effect. Subsequently, the pull buckle 30 is pulled, causing the pull buckle 30 to drive the arc-shaped gear plate 28 to move towards the horizontal section of the L-shaped connecting plate 27 through the connecting rod 27, so that the arc-shaped gear plate 28 is separated from the rotating gear disk 25. Then, the rotating gear disk 25 is rotated to make the inner hexagonal groove 26 correspond to the edge angle of the inner hexagonal screw head 17, and then the rotating gear disk 25 is sleeved on the inner hexagonal screw head 17. The pull buckle 30 is released, causing the arc-shaped gear plate 28 to mesh with the rotating gear disk 25 again, thereby restricting the rotation of the inner hexagonal screw head 17 and preventing the screw rod 16 from rotating and loosening from the fixed nut 15, so as to ensure the connection sealing effect of the two middle protective shells 1 and the first side plate 10 and the second side plate 11, and cooperate to achieve the function of high-temperature flange sealing connection, preventing the bolts from loosening during the use of the flange and affecting the sealing effect, and effectively improving the connection firmness compared with the traditional flange.

[0040] When the two middle protective shells 1 are fitted together, the first sealing gaskets 3 between the two middle protective shells 1 will be in contact, and the ends of the first pressing ring 8 and the second pressing ring 9 respectively installed on the inner sides of the two middle protective shells 1 will be respectively embedded and sealed in the first U-shaped sealing ring 6 and the second U-shaped sealing ring 7. And when the first side plate 10 and the second side plate 11 are in contact, the two second sealing gaskets 13 on their inner sides will be in contact, and through the fastening connection of the screw rod 16 and the fixed nut 15, so that the two first sealing gaskets 3 are meshed and sealed through the tooth grooves on their inner sides, and triple sealing is achieved through the first pressing ring 8 and the second pressing ring 9, and the two second sealing gaskets 13 will be mutually pressed and sealed to achieve quadruple sealing, and cooperate to achieve the function of flange sealing, effectively improving the sealing effect of the flange and ensuring the normal connection and use of the flange.

[0041] The foregoing has shown and described the basic principles, main features and advantages of the present utility model. Those skilled in the art should understand that the present utility model is not limited by the above-mentioned embodiments, and what is described in the above-mentioned embodiments and the specification is only to illustrate the principle of the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements fall within the scope of the present utility model claimed.

Claims

1. A high temperature flange connection structure, characterized in that: It comprises two middle protective shells (1); a sealing assembly is arranged between the two middle protective shells (1); and a first side plate (10) and a second side plate (11) are respectively installed on the side curved surfaces of the two middle protective shells (1); The side surfaces of the first side plate (10) and the second side plate (11) are evenly distributed with first through holes (14), and the side surfaces of the second side plate (11) are respectively welded with fixing nuts (15) at the openings of the first through holes (14); Screw rods (16) are respectively arranged in the No. 1 through holes (14) opened on the side of the No. 1 side plate (10), and the threaded ends of the screw rods (16) are arranged in the corresponding fixing nuts (15) after passing through the No. 1 through holes (14) opened on the No. 1 side plate (10) and the No. 2 side plate (11). The screw rods (16) are respectively installed with hexagon socket screw heads (17) on the side of the No. 1 side plate (10), and a plurality of sets of elastic limit assemblies are evenly distributed and rotatably installed on the side curved surface of the No. 1 side plate (10) corresponding to the hexagon socket screw heads (17).

2. A high temperature flange connection structure according to claim 1, characterized in that: The side surfaces of the No. 1 side plate (10) and the No. 2 side plate (11) opposite to each other are respectively provided with No. 4 engaging grooves (12), and No. 2 sealing pads (13) are respectively arranged in the two No. 4 engaging grooves (12), and the No. 1 through hole (14) is simultaneously penetrated and provided on the side surfaces of the two No. 2 sealing pads (13).

3. A high temperature flange connection structure according to claim 1, characterized in that: The elastic limiting assembly comprises a fixed shaft (18), both ends of which are mounted on the side curved surface of the first side plate (10) through a vertical plate (32), a rotating sleeve (19) is rotatably sleeved on the fixed shaft (18), a spiral spring (20) is arranged between the fixed shaft (18) and the rotating sleeve (19), an L-shaped connecting plate (21) is mounted on the fixed shaft (18), the other end of the L-shaped connecting plate (21) is located on the side of the first side plate (10) and is mounted with a fixed ring (23), a rotating ring (24) is rotatably mounted inside the fixed ring (23), a rotating toothed disc (25) is mounted on the side of the rotating ring (24) facing the hexagon socket screw head (17), a hexagon socket groove (26) is penetrated through the side of the rotating toothed disc (25), and the rotating toothed disc (25) can be sleeved on the outside of the hexagon socket screw head (17) through the hexagon socket groove (26).

4. A high temperature flange connection structure according to claim 3, characterized in that: The two active ends of the spiral spring (20) are respectively fixed to the inner curved surface of the rotating sleeve (19) and the side curved surface of the fixed shaft (18), the horizontal section of the L-shaped connecting plate (21) is installed on the fixed shaft (18), and the vertical end of the L-shaped connecting plate (21) is arranged on the side of the first side plate (10).

5. A high temperature flange connection structure according to claim 3, characterized in that: A second through hole (22) is provided through the horizontal section of the L-shaped connecting plate (21), a connecting rod (27) is provided through the second through hole (22), and the connecting rod (27) and the vertical end of the L-shaped connecting plate (21) are parallel to each other, an arc-shaped toothed plate (28) is installed at the end of the connecting rod (27) facing the rotating toothed plate (25), and the teeth of the arc-shaped toothed plate (28) are located on the inner side of the arc, and the teeth of the arc-shaped toothed plate (28) are meshed with the teeth on the side of the rotating toothed plate (25), an extrusion spring (29) is sleeved on the connecting rod (27), and the extrusion spring (29) is located between the horizontal section of the L-shaped connecting plate (21) and the arc-shaped toothed plate (28), and the other end of the connecting rod (27) is located on the horizontal section of the L-shaped connecting plate (21) and a draw buckle (30) is installed.

6. A high temperature flange connection structure according to claim 1, characterized in that: The sealing assembly comprises two No. 1 embedding grooves (2), the two No. 1 embedding grooves (2) are arranged on the inner sides of the two middle protective shells (1), and a No. 1 sealing gasket (3) is respectively installed in the two No. 1 embedding grooves (2), the opposite sides of the two No. 1 sealing gaskets (3) are respectively provided with meshing tooth grooves, the opposite sides of the two middle protective shells (1) are respectively provided with connection ports (31), and the side of the No. 1 sealing gasket (3) is penetrated by a hole which is communicated with the connection port (31).

7. A high temperature flange connection structure according to claim 1, characterized in that: The two opposing sides of the middle protective shells (1) are respectively provided with a second embedding groove (4) and a third embedding groove (5), and a first U-shaped sealing ring (6) and a second U-shaped sealing ring (7) are respectively installed in the second embedding groove (4) and the third embedding groove (5), and a first extrusion ring (8) and a second extrusion ring (9) are respectively installed in the opposing sides of the two middle protective shells (1), and the ends of the first extrusion ring (8) and the second extrusion ring (9) are respectively embedded in the grooves of the first U-shaped sealing ring (6) and the second U-shaped sealing ring (7), and the first extrusion ring (8) is located outside the second extrusion ring (9), and the second extrusion ring (9) is located outside the opening of the first embedding groove (2).

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