Pressure gas pipeline flange joint

Abstract

A kind of pressure gas pipeline flange joint, the connecting port inside of flange is fixedly connected with one inclined surface pressure ring respectively, the inner side of two flanges is provided with multiple arc pressure plates respectively, the two sides of arc pressure plate are folded to the upper side and cooperate with inclined surface pressure ring, the surface of fixed hoop is equipped with the drive structure that can control the radial movement of multiple arc pressure plates;When using specifically, the high-pressure environment formed by the inner wall of two flanges in work can be used to push arc pressure plate to move to the outside, the stronger the pressure that pushes arc pressure plate to move to the outside, the tighter and the sealing of the connection of two flanges is, the tighter and the sealing of the connection of fixed hoop and two flanges is, the sealing and the tightness of flange when using in high-pressure environment can be improved sufficiently, and disassembly is simple and convenient, and the use effect is remarkable.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of pipeline connecting parts, and particularly relates to a flange joint of a pressure gas pipeline. BACKGROUND

[0002] A flange is a part for connecting shafts with each other, and is also used for connecting pipe ends, and plays an important role in connecting pipes, pumps, valves, pressure vessels and various pressure-bearing equipment; mainly, by means of connecting bolts passing through flange bolt holes, pressure is applied to the flange sealing surface under the action of bolt pretightening force, and the sealing gasket clamped between a pair of flanges is pressed, so that the gasket is plastically deformed or elastically deformed under the action of bolt pressure, thereby filling the micro-geometric gap of the flange sealing surface to achieve the sealing purpose. The flange used in the prior art is relatively troublesome to install and disassemble when used as a connection of a high-pressure pipeline, and the sealing performance is unstable, and especially under the conditions of high temperature, high pressure, and medium with strong toxicity, leakage is prone to occur, which causes serious consequences. SUMMARY

[0003] In view of the above, in order to overcome the defects of the prior art, the present application provides a flange joint of a pressure gas pipeline, which effectively solves the problems mentioned in the background.

[0004] To solve the above problems, the technical scheme adopted by the present application is as follows:

[0005] A flange joint of a pressure gas pipeline, comprising a pair of flanges arranged opposite to each other, a fixed clamp is sleeved on the outer surface of the pair of flanges, and an inner circle inclined surface pressure ring inclined inward is fixedly connected to the inner side of the connecting port of the flange, the inclined surfaces of the two inclined surface pressure rings are mirror images, a plurality of arc-shaped pressure plates are arranged on the inner sides of the two flanges, the two sides of the arc-shaped pressure plates are reversely folded upward and matched with the inclined surface pressure rings, the outer ends of the arc-shaped pressure plates are respectively connected with connecting structures, the connecting structures extend out of the outer end of the fixed clamp, the surface of the fixed clamp is provided with a driving structure capable of controlling the radial movement of the plurality of arc-shaped pressure plates, and one end of the connecting structure extending out of the fixed clamp is connected with the driving structure.

[0006] Further, the circumferential surface of one end of the flange contact is fixedly connected with an annular backing plate, and the two annular backing plates form an annular clamping groove, the inner side of the fixed hoop is fixedly connected with a convex rib which can fill the annular clamping groove, the outer side of the flange contact is provided with an annular inclined groove, the inclined groove is located on the inner side of the convex rib, the inner side of the two inclined grooves is uniformly matched with a plurality of arc-shaped double-inclined surface matching blocks, the number of the double-inclined surface matching blocks is equal to that of the arc-shaped pressure plates and they are arranged in correspondence with each other, the double-inclined surface matching blocks are moved radially inward by extrusion when the two flanges are moved inward under the mutual cooperation of the inclined surfaces of the inclined groove and the double-inclined surface matching block, the outer end of the double-inclined surface matching block is fixedly connected with a sliding rod, the upper end of the sliding rod is fixedly connected with a sealing pad, the inner end of the convex rib corresponding to the sealing pad is provided with a mounting hole penetrating through the surface of the fixed hoop, and the inner side of the mounting hole is provided with a first groove capable of accommodating the sealing pad, the sliding rod is slidingly fitted in the inner side of the mounting hole and the sealing pad is arranged in the first groove.

[0007] Further, the inner end of the double-inclined surface block is provided with a through hole, the inner side of the through hole is provided with a cylindrical groove, the outer end of the arc-shaped pressure plate is fixedly connected with a fixed rod, the positions corresponding to the fixed rod of the two flanges are respectively provided with a through groove for accommodating the fixed rod, and the other end of the fixed rod is fixedly connected with a first sealing pad, which is slidingly fitted in the inner side of the cylindrical groove.

[0008] Further, the outer end of the arc-shaped pressure plate is fixedly connected with an annular sealing protrusion on the side in contact with the two inclined pressure rings, the annular sealing protrusion is coaxially arranged with the fixed rod, and the end of the arc-shaped pressure plate on both sides is fixedly connected with a sealing ring on the side in contact with the inner wall of the flange.

[0009] Further, the connecting structure comprises an adjusting screw fixedly connected to the outer end of the first sealing pad, the adjusting screw extends out of the outer side of the fixed hoop through the mounting hole, the outer end of the adjusting screw is respectively provided with a limiting groove on both sides, the inner wall of the mounting hole is respectively fixedly connected with a limiting protrusion which can slidingly cooperate with the limiting groove, the adjusting screw can only move axially under the sliding cooperation of the limiting protrusion and the limiting groove, the surface of the adjusting screw is threadedly connected with an adjusting sleeve, the inner end of the adjusting sleeve is respectively rotatably connected with a mounting ring, and the mounting ring is respectively fixedly connected with the fixed hoop.

[0010] Further, the driving structure comprises a connecting bevel gear fixedly connected to the surface of the adjusting sleeve, one side of the plurality of connecting bevel gears is jointly meshed with a bevel gear ring, the outer end of the bevel gear ring is fixedly connected with a driving ring, and the driving ring is fixedly connected with the fixed hoop.

[0011] Further, the side of the annular backing plate in contact with the convex rib is respectively fixedly connected with an annular second sealing pad.

[0012] Further, the surface of the annular base plate and the fixing hoop is respectively provided with a plurality of key-shaped holes, the key-shaped holes are annular and uniformly arranged and correspond to each other in up and down directions, and a detachable bolt is inserted into the key-shaped holes corresponding to each other in up and down directions.

[0013] Further, the surface of the bolt near the inner end is respectively provided with an installation groove extending to the inner side on the two sides corresponding to each other, the installation groove is respectively connected with a one-way block which can move radially to the inner side in a sliding mode, the inner side of the upper and lower ends of the one-way block is respectively fixedly connected with a reset spring, the other end of the reset spring is respectively fixedly connected with the inner wall of the installation groove, and the outer end of the one-way block is respectively inclined to the inner side on the lower side.

[0014] Further, the upper end of the bolt is respectively provided with a connecting hole extending to the installation groove on the lower side, an inner rod is slidingly matched in the connecting hole, the two sides corresponding to each other of the inner end of the inner rod are respectively hinged with a hinge rod, and the other end of the hinge rod is respectively hinged with the inner end of the one-way block.

[0015] The application has the following advantages compared with the prior art:

[0016] When the application is used, the bolt is inserted into the key-shaped hole after the two flanges are butted, and the installation of the two flanges is completed by rotating the driving ring, so that the installation is simple and convenient. When the application is used, the arc-shaped pressure plate can be moved to the outer side by the high-pressure environment formed by the inner wall of the two flanges, and the stronger the pressure of the arc-shaped pressure plate moving to the outer side, the stronger the tightness and the sealing performance of the two flanges connected, and the tightness and the sealing performance of the fixing hoop connected with the two flanges. Therefore, the sealing performance and the tightness of the flange used in the high-pressure environment can be improved, and the application is simple and convenient to disassemble and has remarkable use effect. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a whole structure schematic view of the pressure gas pipeline flange joint.

[0018] Figure 2 It is an arc-shaped pressure plate installation structure schematic view of the pressure gas pipeline flange joint.

[0019] Figure 3 It is a double-bevel matching block installation structure schematic view of the pressure gas pipeline flange joint.

[0020] Figure 4 It is a bevel groove structure schematic view of the pressure gas pipeline flange joint.

[0021] Figure 5 It is a convex rib internal structure schematic view of the pressure gas pipeline flange joint.

[0022] Figure 6 It is a schematic diagram of the fixing rod mounting structure of the pressure gas pipeline flange joint of the application.

[0023] Figure 7 It is a schematic diagram of the bevel gear ring driving structure of the pressure gas pipeline flange joint of the application.

[0024] Figure 8 It is a schematic diagram of the latch mounting structure of the pressure gas pipeline flange joint of the application.

[0025] Figure 9 It is a schematic diagram of the internal structure of the latch of the pressure gas pipeline flange joint of the application.

[0026] Figure 10 It is a schematic diagram of the adjusting sleeve mounting structure of the pressure gas pipeline flange joint of the application.

[0027] In the figure: 1-flange, 2-fixing hoop, 3-arc-shaped pressure plate, 4-bevel pressure ring, 6-adjusting screw, 7-mounting ring, 8-adjusting sleeve, 9-connecting bevel gear, 10-bevel gear ring, 11-driving ring, 12-bevel groove, 13-double-bevel matching block, 14-fixing rod, 16-first sealing gasket, 17-sliding rod, 18-sealing gasket block, 19-first groove, 20-mounting hole, 21-convex rib, 22-annular gasket plate, 23-annular sealing protrusion, 24-second sealing gasket, 25-key-shaped hole, 26-latch, 27-reinforcing gasket, 28-inner rod, 29-assisting ball, 30-one-way stop block, 31-return spring, 32-hinged rod, 33-mounting groove. DETAILED DESCRIPTION

[0028] The following is a specific embodiment of the application, and the technical solutions of the application are further described in conjunction with the accompanying drawings, but the application is not limited to these embodiments.

[0029] As Figures 1-10 shown, the application provides a pressure gas pipeline flange joint, which comprises a pair of flanges 1 arranged correspondingly on the left and right, and a fixing hoop 2 sleeved on the outer surface of the pair of flanges 1. The inner side of the connecting port of each flange 1 is fixedly connected with a bevel pressure ring 4 with an outer end face inner ring inclined to the inner side. The bevels of the two bevel pressure rings 4 are mirror images. The inner side of each flange 1 is provided with a plurality of arc-shaped pressure plates 3. The two sides of each arc-shaped pressure plate 3 are folded upward and matched with the bevel pressure ring 4. The outer end of each arc-shaped pressure plate 3 is connected with a connecting structure, which extends out of the outer end of the fixing hoop 2. The surface of the fixing hoop 2 is provided with a driving structure capable of controlling the radial movement of the plurality of arc-shaped pressure plates 3. The end of the connecting structure extending out of the fixing hoop 2 is connected with the driving structure.

[0030] In use, the device is connected by the two flanges 1, the arc-shaped pressure plate 3 is connected with the driving structure on the surface of the fixed hoop 2 through the connecting structure, and the arc-shaped pressure plate 3 is driven to move outward through the transmission of the connecting structure when the driving structure is controlled. When the arc-shaped pressure plate 3 moves outward, the two flanges 1 are squeezed inward by extruding the inclined surface compression ring 4 through the sliding cooperation of the reverse folding structure on both sides of the arc-shaped pressure plate 3 and the inclined surface compression ring 4, so that the two flanges 1 can be tightly matched and the sealing performance is maintained. When the flange 1 works in a high-pressure environment, the high pressure inside the flange 1 can also force the arc-shaped pressure plate 3 to expand outward. The stronger the outward expansion of the arc-shaped pressure plate 3, the greater the extrusion force of the inclined surface compression ring 4, and the stronger the mutual pressure of the two flanges 1. The sealing performance of the two flanges 1 connected is stronger. In use, the device uses the high-pressure environment inside the flange 1 when working to enhance the sealing effect of the two flanges 1 in a high-pressure environment, and is simple and convenient to install, and has remarkable use effect.

[0031] In order to further enhance the firmness and sealing of the connection between the flange 1 and the fixing hoop 2, the circumferential surface of the end contacted by the flange 1 is fixedly connected with an annular backing plate 22, and an annular clamping groove is formed between the two annular backing plates 22. The inner side of the fixing hoop 2 is fixedly connected with a convex rib 21 which can fill the annular clamping groove. The outer side of the side contacted by the flange 1 is provided with an annular inclined groove 12. The inclined groove 12 is located on the inner side of the convex rib 21. A plurality of arc-shaped double-inclined surface matching blocks 13 are uniformly matched in the inner side of the two inclined grooves 12. The double-inclined surface matching blocks 13 are equal in number to the arc-shaped pressure plates 3 and are arranged in correspondence with the upper and lower sides. When the two flanges 1 move inward, the double-inclined surface matching blocks 13 are moved radially inward by extrusion. The outer end of the double-inclined surface matching blocks 13 is fixedly connected with a sliding rod 17. The upper end of the sliding rod 17 is fixedly connected with a sealing pad 18. The inner end of the convex rib 21 opposite to the sealing pad 18 is provided with a mounting hole 20 which penetrates through the surface of the fixing hoop 2. A first groove 19 which can accommodate the sealing pad 18 is formed in the inner side of the mounting hole 20. The sliding rod 17 is slidingly matched in the inner side of the mounting hole 20, and the sealing pad 18 is arranged in the first groove 19. When the two flanges 1 are pressed inward, the double-inclined surface matching blocks 13 are moved inward under the sliding matching of the inclined groove 12 and the double-inclined surface matching blocks 13. When the double-inclined surface matching blocks 13 move inward, the sealing pad 18 is pressed against the inner wall of the first groove 19 under the driving of the sliding rod 17. Thus, the firmness of the connection between the fixing hoop 2 and the two flanges 1 is enhanced. Also, the high-pressure environment of the flange 1 is utilized. The greater the pressure inside the flange 1, the stronger the tightness of the connection between the two flanges 1, and the stronger the force pushing the double-inclined surface matching blocks 13 inward. Thus, the firmness of the connection between the fixing hoop 2 and the two flanges 1 is enhanced. Under the high pressure, the sealing pad 18 can fully seal the gap between the mounting hole 20 and the sliding rod 17, and the sealing effect is remarkable.

[0032] In order to install the arc-shaped pressure plate 3 and ensure that the arc-shaped pressure plate 3 can be normally used, a through hole is formed in the inner end of the double-inclined surface block, and a cylindrical groove is formed in the inner side of the through hole. The outer end of the arc-shaped pressure plate 3 is fixedly connected with a fixing rod 14. The positions corresponding to the fixing rod 14 of the two flanges 1 are respectively provided with a through groove for accommodating the fixing rod 14. The other end of the fixing rod 14 is fixedly connected with a first sealing pad 16. The first sealing pad 16 is slidingly matched in the inner side of the cylindrical groove. The arc-shaped pressure plate 3 is connected with the double-inclined surface block through the fixing rod 14. The first sealing pad 16 has the effect of sealing the cylindrical groove.

[0033] The outer end of the arc-shaped pressure plate 3 is fixedly connected with the one side of the two inclined surface pressure rings 4 in contact with the annular sealing protrusion 23, the annular sealing protrusion 23 is coaxially arranged with the fixed rod 14, the annular sealing protrusion 23 can be made of rubber material, and when being extruded, the elastic deformation can enhance the sealing effect of the position where the fixed rod 14 and the inner end of the flange 1 are connected, and in order to enhance the tightness when the arc-shaped pressure plate 3 is connected with the inner wall of the flange 1, and to improve the buffer distance when the arc-shaped pressure plate 3 is extruded to the outside of the flange 1 under high pressure, the arc-shaped pressure plate 3 is convenient for use, the one side of the end portion of the arc-shaped pressure plate 3 in contact with the inner wall of the flange 1 is fixedly connected with a sealing ring, the sealing ring can be made of rubber material, so that when the arc-shaped pressure plate 3 is pressed against the inner wall of the flange 1, the sealing ring can be elastically deformed to improve the connection effect.

[0034] In order to facilitate the control of the arc-shaped pressure plate 3, the connecting structure comprises an adjusting screw 6 fixedly connected to the outer end of the first sealing gasket 16, the adjusting screw 6 extends out of the outer side of the fixed hoop 2 through the mounting hole 20, the outer end of the adjusting screw 6 is correspondingly provided with a limiting groove on each side, and the outer side of the inner wall of the mounting hole 20 is fixedly connected with a limiting protrusion which can be slidably connected with the limiting groove, the adjusting screw 6 can only move axially under the sliding cooperation of the limiting protrusion and the limiting groove, a adjusting sleeve 8 is threadedly connected to the surface of the adjusting screw 6, the inner end of the adjusting sleeve 8 is rotatably connected with a mounting ring 7, and the mounting ring 7 is fixedly connected with the fixed hoop 2, rotating the adjusting sleeve 8 can drive the adjusting screw 6 to move axially under the action of the thread connection between the adjusting sleeve 8 and the adjusting screw 6, and then the fixed rod 14 drives the arc-shaped pressure plate 3 to move;

[0035] In order to further facilitate the user to control the arc-shaped pressure plate 3, the driving structure comprises a connecting bevel gear 9 fixedly connected to the surface of the adjusting sleeve 8, a bevel gear ring 10 is meshed with one side of a plurality of connecting bevel gears 9, a driving ring 11 is fixedly connected to the outer end of the bevel gear ring 10, the driving ring 11 is fixedly connected with the fixed hoop 2, a plurality of protrusions are fixedly connected to the circumferential surface of the driving ring 11 for assisting the rotation of the driving ring 11, the rotation of the driving ring 11 can drive the bevel gear ring 10 to mesh with the connecting bevel gear 9 to drive the adjusting sleeve 8, so as to facilitate the user to control the movement of the arc-shaped pressure plate 3.

[0036] In order to improve the sealing property of the flange 1 and the fixed hoop 2, the one side of the annular gasket plate 22 in contact with the convex rib 21 is fixedly connected with an annular second sealing gasket 24, the second sealing gasket 24 can be made of rubber material, and when the flange 1 is extruded inward, the second sealing gasket 24 can be elastically deformed when being pressed against the surface of the convex rib 21, thereby further improving the sealing property of the connection between the flange 1 and the fixed hoop 2.

[0037] In order to facilitate the connection of the two flanges 1 and the fixed hoop 2, the two flanges 1 can be stably used, and the sealing performance will not be poor due to rotation during use. The surface of the annular pad plate 22 and the fixed hoop 2 is respectively provided with a plurality of key-shaped holes 25. The key-shaped holes 25 are annularly and uniformly arranged and correspond to each other. A detachable bolt 26 is inserted into the upper and lower corresponding key-shaped holes 25. The bolt 26 can limit the flange 1 and the fixed hoop 2 through sliding fit with the two key-shaped holes 25, so that the flange 1 can only move axially, and the fixed hoop 2 and the flange 1 cannot be separated and rotated. The installation and disassembly of the bolt 26 are very convenient, which is convenient for users to use.

[0038] In order to facilitate the installation of the bolt 26, the surface of the bolt 26 near the inner end is respectively provided with an inwardly extending installation groove 33 on the two sides corresponding to each other. The installation groove 33 is respectively slidably connected with a one-way block 30 which can move radially inward. The inner sides of the upper and lower ends of the one-way block 30 are respectively fixedly connected with a reset spring 31. The other end of the reset spring 31 is respectively fixedly connected with the inner wall of the installation groove 33. The outer end of the one-way block 30 is respectively inclined inwardly. Under the action of the inclined surface structure on the outer side of the one-way block 30, when the bolt 26 is vertically inserted into the key-shaped hole 25, the one-way block 30 will move inwardly under the force and press the reset spring 31. When the one-way block 30 protrudes to the lower side of the key-shaped hole 25, the one-way block 30 is not blocked and can move outwardly under the pushing of the reset spring 31, so that the bolt 26 cannot be separated from the key-shaped hole 25.

[0039] In order to facilitate the disassembly of the bolt 26, the upper end of the bolt 26 is respectively provided with a connecting hole extending to the installation groove 33. An inner rod 28 is slidably fitted in the connecting hole. The inner end of the inner rod 28 is respectively hinged with a hinge rod 32. The other end of the hinge rod 32 is respectively hinged with the inner end of the one-way inclined block. The outer end of the inner rod 28 extends out of the connecting hole and the inner end of the inner rod 28 is respectively fixedly connected with an auxiliary ball 29. The outer end surface of the bolt 26 is respectively fixedly connected with a reinforcing pad 27. The reinforcing pad 27 can be made of rubber material. When the bolt 26 is installed, the rebound force of the reinforcing pad 27 can be generated by extruding the reinforcing pad 27, so as to improve the firmness of the bolt 26 during installation. When the bolt 26 is disassembled, the inner rod 28 can be moved outwardly by pulling the auxiliary ball 29, so that the two one-way blocks 30 can be moved inwardly under the driving of the two hinge rods 32 and press the reset spring 31. When the two one-way blocks 30 move into the installation groove 33, the bolt 26 can be removed from the key-shaped hole 25 under the pulling, and the disassembly of the bolt 26 is completed. When reinstalling, the bolt 26 can be inserted again. The operation is simple and convenient, and the function is various.

[0040] The device is used to butt joint two flanges 1, and the fixing hoop 2 is sleeved on the butt joint of the two flanges 1, and after the butt joint is completed, the arc-shaped pressure plate 3 is located on the inner side of the two flanges 1, the double-inclined surface matching block 13 is located in the inclined surface groove 12, the latch 26 is respectively inserted into the key-shaped hole 25, then the arc-shaped pressure ring is tightly pressed against the inner wall of the two flanges 1 under the driving of the rotating driving ring 11, and in use, the arc-shaped pressure plate 3 can be pushed to move outward under the high-pressure environment in the flange 1, the stronger the pressure of the arc-shaped pressure plate 3 pushed to move outward, the stronger the tightness and the sealing performance of the two flanges 1 connected, and the stronger the tightness and the sealing performance of the fixing hoop 2 and the two flanges 1 connected, so that the sealing performance of the flange 1 in use under the high-pressure environment and the tightness in connection can be fully improved, and the installation and dismounting are simple and convenient, and the use effect is remarkable.

[0041] The specific embodiments described herein merely exemplify the spirit of the present application. Those skilled in the art of the present application can make various modifications or supplements to the described specific embodiments or use similar ways instead, without departing from the spirit of the present application or exceeding the scope defined by the appended claims.

Claims

1. A pressure gas pipeline flange joint, comprising a pair of flanges (1) arranged in correspondence with each other, and a fixing clamp (2) sleeved on the outer surface of the pair of flanges (1), characterized in that: The flange (1) is fixedly connected to the inner side of the connection port with a beveled pressure ring (4) whose inner ring of the outer end face is inclined inward. The beveled surfaces of the two beveled pressure rings (4) are mirror images of each other. Multiple arc-shaped pressure plates (3) are respectively provided on the inner side of the two flanges (1). The two sides of the arc-shaped pressure plates (3) are folded upward and cooperate with the beveled pressure rings (4). The outer ends of the arc-shaped pressure plates (3) are respectively connected to a connecting structure. The connecting structure extends out of the outer end of the fixing hoop (2). The surface of the fixing hoop (2) is equipped with a drive structure that can control the radial movement of multiple arc-shaped pressure plates (3). One end of the connecting structure extends out of the fixing hoop (2) and is connected to the drive structure. An annular gasket (22) is fixedly connected to the circumferential surface of one end of the flange (1). An annular groove is formed between the two annular gaskets (22). A convex rib (21) that can fill the annular groove is fixedly connected to the inner side of the fixing hoop (2). An annular inclined groove (12) is opened on the outer side of the flange (1). The inclined groove (12) is located inside the convex rib (21). Multiple arc-shaped double inclined mating blocks (13) are evenly matched on the inner side of the two inclined grooves (12). The number of double inclined mating blocks (13) is equal to that of the arc-shaped pressure plate (3) and they are arranged vertically and vertically. The inclined surfaces of the inclined grooves (12) and the double inclined mating blocks (13) are matched with each other. When the two flanges (1) move inward, the double inclined mating block (13) will move radially inward through compression. The outer end of the double inclined mating block (13) is radially fixedly connected to a slide rod (17). The upper end of the slide rod (17) is fixedly connected to a sealing gasket (18). The inner end of the protruding rib (21) corresponding to the sealing gasket (18) is provided with a mounting hole (20) that penetrates the surface of the fixing hoop (2). The inner side of the mounting hole (20) is provided with a first groove (19) that can accommodate the sealing gasket (18). The slide rod (17) slides in the inner side of the mounting hole (20) and the sealing gasket (18) is placed in the first groove (19). The inner end of the double inclined mating block (13) is provided with a through hole to the outside, and a cylindrical groove is provided on the inner side of the through hole. A fixed rod (14) is radially fixedly connected to the outer end of the arc-shaped pressure plate (3). The two flanges (1) are respectively provided with through grooves for accommodating the fixed rod (14) at the positions corresponding to the fixed rod (14). The other end of the fixed rod (14) is fixedly connected with a first sealing gasket (16), and the first sealing gasket (16) is slidably fitted on the inner side of the cylindrical groove. The outer end of the arc-shaped pressure plate (3) is fixedly connected to the side that contacts the two inclined pressure rings (4) with an annular sealing protrusion (23). The annular sealing protrusion (23) is coaxially arranged with the fixing rod (14). The ends of the arc-shaped pressure plate (3) on both sides are fixedly connected to the side that contacts the inner wall of the flange (1) with a sealing ring.

2. A pressure gas pipeline flange joint as described in claim 1, characterized in that: The connection structure includes an adjusting screw (6) fixedly connected to the outer end of the first sealing gasket (16). The adjusting screw (6) extends out of the outer side of the fixing hoop (2) through the mounting hole (20). Limiting grooves are respectively opened on the two sides of the outer end of the adjusting screw (6). Limiting protrusions that can slide with the limiting grooves are fixedly connected to the outer side of the inner wall of the mounting hole (20). Under the sliding cooperation between the limiting protrusions and the limiting grooves, the adjusting screw (6) can only move axially. An adjusting sleeve (8) is threadedly connected to the surface of the adjusting screw (6). The inner end of the adjusting sleeve (8) is rotatably connected to the mounting ring (7). The mounting ring (7) is fixedly connected to the fixing hoop (2).

3. A pressure gas pipeline flange joint as described in claim 1, characterized in that: The drive structure includes a connecting bevel gear (9) fixedly connected to the surface of the adjusting sleeve (8), and a bevel ring (10) meshes with one side of multiple connecting bevel gears (9). A drive ring (11) is fixedly connected to the outer end of the bevel ring (10), and the drive ring (11) is fixedly connected to the fixing hoop (2).

4. A pressure gas pipeline flange joint as described in claim 1, characterized in that: The annular pad (22) and the convex rib (21) are respectively fixedly connected with an annular second sealing gasket (24).

5. A pressure gas pipeline flange joint as described in claim 1, characterized in that: The surfaces of the annular pad (22) and the fixing hoop (2) are respectively provided with multiple key holes (25). The key holes (25) are arranged in a ring and are corresponding to each other. A detachable pin (26) is inserted into the corresponding key hole (25).

6. A pressure gas pipeline flange joint as described in claim 5, characterized in that: The pin (26) has mounting grooves (33) extending inward on both sides of the surface near the inner end. The mounting grooves (33) are slidably connected to one-way blocks (30) that can move radially inward. The inner sides of the upper and lower ends of the one-way blocks (30) are fixedly connected to return springs (31). The other end of the return springs (31) is fixedly connected to the inner wall of the mounting groove (33). The lower side of the outer end of the one-way blocks (30) is inclined inward.

7. A pressure gas pipeline flange joint as described in claim 6, characterized in that: The upper end of the pin (26) is provided with a connecting hole extending downward to the mounting groove (33). An inner rod (28) is slidably fitted inside the connecting hole. The inner ends of the inner rod (28) are respectively hinged to the two sides of the inner end. The other end of the hinge rod (32) is respectively hinged to the inner end of the one-way inclined block.

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